CA2146585A1 - Catheterized, targeted infusion of medication - Google Patents
Catheterized, targeted infusion of medicationInfo
- Publication number
- CA2146585A1 CA2146585A1 CA002146585A CA2146585A CA2146585A1 CA 2146585 A1 CA2146585 A1 CA 2146585A1 CA 002146585 A CA002146585 A CA 002146585A CA 2146585 A CA2146585 A CA 2146585A CA 2146585 A1 CA2146585 A1 CA 2146585A1
- Authority
- CA
- Canada
- Prior art keywords
- needle
- drilling
- perforator
- catheter
- adaptor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3472—Trocars; Puncturing needles for bones, e.g. intraosseus injections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
- A61C1/08—Machine parts specially adapted for dentistry
- A61C1/087—Supplying powder or medicines
Abstract
Apparatus and method for catheterized delivery or infusion of medication and anaesthesia are disclosed. The perforating catheter is first used to perforate the periodontal ligament and/or the cortical plate of bone tissue, and is then left in place and used as a catheter for insertion of a hypodermic needle of smaller gauge to deliver medication or anaesthesia to a target area. The perforator is a bevelled needle for drilling into the ligament or bone tissue. For drilling, the device comprises an adaptor which transmits the rotational movement from a dental hand piece or the like to the bevelled needle. A cap is also included for protecting the bevelled needle during storage of the device. The adaptor may have a rod which extends axially into the bevelled needle when the device is assembled for drilling. The rod is used to prevent the debris resulting from drilling from blocking the passage in the bevelled needle.
As well, the rod reinforces the needle and maintains the alignment between the perforator and the adaptor for improved drilling efficiency.
As well, the rod reinforces the needle and maintains the alignment between the perforator and the adaptor for improved drilling efficiency.
Description
21~6~8 .
CATHETERIZED, TARGETED INFUSION OF MEDICATION
BACKGROIJND OF THE INVENTION
1. Fi~ of ~hP i The present inYention provides for a simple method and device for infusing or S imjecting - it is applicalble to medical or dental and the like procedures.
More ~ ,, the invention is directed to ' ' delivery of anaesthesia and other " More l,~i ' '~ still, it is directed to ' delivery of dental anaesthetic to a targeted nel ve and to an apparatus for such delivery.
CATHETERIZED, TARGETED INFUSION OF MEDICATION
BACKGROIJND OF THE INVENTION
1. Fi~ of ~hP i The present inYention provides for a simple method and device for infusing or S imjecting - it is applicalble to medical or dental and the like procedures.
More ~ ,, the invention is directed to ' ' delivery of anaesthesia and other " More l,~i ' '~ still, it is directed to ' delivery of dental anaesthetic to a targeted nel ve and to an apparatus for such delivery.
2. R.' ' Art 10 There are a variety of methods currently in use for providing local anaesthetic in dentistry. These methods and ~rl however all have ~.v ~ either being difficult for I to perform or painful and unplea~ant to the patient.
An example of a method used curr~ntly in dentistry is the iDfiltration method, whereby a local anaesthetic solution is mjected into the soft tissue of gingiva. In doing so, the 15 solution eventually passes tbrough ~he corlical plate affecting the nerve bundle entering 21~6~5 .
the tooth. Di~d. ~ of tbis m~thod include tne delay of onset of anaesthesia after the injection and, m most cases, b;lllooning of tbe injected tissue. As well, there is an e~tended period of time for recovery of the tissue until ~eturn to normal condition.
Another method which is culren~dy used is the regional block method whereby an 5 anaesthetic solution is imjected locally in proximity to the nerve trunk as it eAters the bone. D " ~ of this procedure are that it is extremely difficult to locate the nerve trunk, there is discomfort to the patient and a delay for the anaesthetic to t~ke effect. As im the case of the infi~ltration method, this method a long recovery period for tissue to retur n to normal.
0 At present, two types of appar,itus have been used to perform intra-osseous These are surgical bul s used to perforate the cortical plate and the villet mjectors.
The use of a surgica'l bur has ~ in that burs are e~pensive and they bave to be sterilized between uses or a new bur used each time. In addition, the method 15 is slo v, requiring the atiached gingiva amd periosteum to be ' before the cortical plate is perforated. The villet injector is an apparatns tbat serves both as a perforator and injector. It uses specially designed needles rotated by a cu.~
dental motor. A d i,~.d~ ~ of this device is that the needle often becomes clogged with pulverized bone which obstructs the passage in tbe needle and prevents mjection ` 21465~
of the anaesthetic solution. It is generally difficult to remove the clogging material from the needle and often the Illse of a second needle is necessary. Other d;~ of this method includ~ the initial capital cost of the instrument purchase, and the cost of the needles which ate somewhat expensive. In addition, the desig{t of S the instrument ~akes access to valious parts of the mouth difficul~ and sometiines .. .
Intra-osseous and targeted root-canal nerve ~ ' have not become popular for the reason that thete has not beerl a practical technique of making the injections ~u~rull~ . For e~ample, there hlls been a general belief that this method is radical 10 amd to be restored ~o only if nerve b~ock and infiltration anaesthetic do not . " -the desired result. However, intra-osseous amd targeted injections produce positive, more profound ~ ' amd could be made with less pain than either of the other types according to the present invelltion.
Targeted ' has several advantages over prior art nerve block or infil~ion 15 methods. There is no feeling of numbness in the tongue, cheek, or lips during or after the injection and there is no aftcr-pain. The anaesthetic is profound and acts '~ alleviating the necessity of waiting for the anaestbetic to take effect as with the nerve block amd infiltratiotl methods. r ~ ," as only a few drops of anaesthetic are injected, there is no ieeling of faintness or increasnng of the pulse rate.
21~6S85 To achieve targeted: ' one must gain access, if intra-osseous, to the c mcellous bone by going through the cortical layer; or to tbe bottom of the tooth, if root-camal targeted: ' is desired. Because of instant ' and profound pulpal ' there is a mu~,h greater control over the region one wishes to ' , resulting im a much smaller dose of ' , as well as, of course, other ' where applicabl(~.
United States Patent 5,173,050 (Di].lon) discloses a dental apparatus for ~. ~ ~ tbe cortical plate of human maxillary and ' ' ' bones. The apparatus of Dillon comprises a metal ne&dle moulded into a plastic shank. Tbe shank is being formedwith means for ~-~F-- with a dental hand piece for i ~ the rotational movement to the needle. The need,e used for drilling is solid and has a sharp bevelled free end. The apparatus described by Dillon is disposable.
However, the device disclosed in Dillon's patent cannot be used as a catheter for injecting anaesthetic by imserting a l~",o,' needle thro~gh the drilling needle. As well, tbe device disclosed by Dilloll is not provided with meams for blocking ent~y of bone debris into the ne&dle ~;...~,~,w~. In addition, the direct connection between the h~md piece and the perforator does not provide for a safe and reliable barrier against bacteria passimg from the ne&dle to the h;md piece.
United States Patent 3,534,476 (~rinters) discloses a driDing and fiDing root canal ~ 21~658~
apparatus. The dTilling is performled by a drill having a cent~al bore. The depth of the root canal is d ' in ad~lance and a stop is placed on the drill to limit the depth of drilling. The device is provided with a flexible rod which is pushed into the root canal so tbat the drill is directed along this road to follow the contour of the canal 5 so that resulting bore will have an uniform diameter which is free of shoulders or ledges The apparatns disclosed by Winters is concerned with enlarging the root canal after the ~erve bas been ext~acted. This apparatus is not used for injecting medication in close proximity to a targeted arl~a for treatment or -United States Patent 4,944,677 (A~exandre) discloses a smooth hollow needle with a10 bevelled point for drilling a hole into the jawbone near the apex of the tooth to be Thereafter, the drilling device 13 removed from the jaw, and a h~ needle of 'l~ the same gauge is irlserted into the hole amd is injected. Thus, ther~ is no catheti~ed delivery of , witn the attendant .' ". "t tbat the ple-drilled hole n~ay be difficult to locate when 15 inserting the h~. needle.
One -t, ~ 1~ older United Statt s patent that is discussed by Ale~andre (above) is United States Patent 2,317,648 (~Siqveland) granted im 1943. In addition to the mentioned by Alexlmdre, the fact tbat Siqveland teaches use of threaded sleeve which penetrates the bone d~ing drilling and is left (screwed) in the bone to 20 serve as a guide for insertion of tht actual injection needle. Due to the cost of such 21~6~85 a device, it cannot be made disposalble; but more ~ , for the threaded sleeve to be securely fastened in the bone il~ would have to rotate at a much slower speed than the drill (as in Siqveland) or the drilling catheter (as in tne present mvention).
SUMMAR~i~ 01; THE INVENTION
5 The present invention ,~av~ to mitigate tbe problems amd ~;~aJ~ ~ of delivering dental anaesthetic L .~ ~ id with the prior art methods amd devices.
The present invention provides a pe~forator having a central passage, which perforator then remains in place as a catheter for allowi~g a hyl,o~ - needle to be inser~ed through the passage to deliver the desired " The preferred apparatus is 10 provided with means for obstructmll the entry of debris in the perforator's passage.
According to an apparatus aspect ~lf the present mvention, a device for cathetized delivery of medication comprises: a hollow drilling catheter means for penetrating ligament, tissue or bone amd adapte~i to remain in place after dtilling; and means for engaging and ~ , e tne drilling catheter to amd from a rotary drive shaft.
15 In a further aspect, the rotaty drive shaft comprises an axial rod adapted to be inser~ed into the hollow drillimg catheter wh~ n engaging it.
21~6~8~
.
According to another aspect of the present invention, there is provided a device for pc.~l~1i.5, the r ' ~ ' ~ ligamen~s, cortical plate of small bones, amd the like, for injecting substances at a y~ L~ ' site, ~ , ~ a perforator for drilling a hole mto the ligament, bone or tis~;ue, wherein said perforator is provided with an ilmer passage to form a catheter adapted to ren~un in the hole perforated for directing a h~l,od. needle to said pl~d~; I site, and an adaptor for latching in a latchinLg-tvpe powered dental handpiece for; ~ rotational movement to said perforator.
The . -k ~ d intra-osseous delivery system of the present invention comprises a 10 perforator with a bevelled drilling needle that is used as a drill and a catheter. The needle is attached at one end to a l~lastic or metal body. For drilling, the body is attached to a matching adaptor pro~ided with a drivimg shank which is rotated by a ~,.... contra angle or straight dental har,d piece. Then, the perforator is used as a catheter, whereby a h~ ' needle is inserted tbrough the drilling needle 15 without losmg access to the already perforated bone.
In the preferred form of the inventil)n the apparatus is disposable. Before disposal, the perforator receives a cap over the needle for protection against accidental ~: of ~IIVil~
The present imvention also provides a method of medical treatment, comprisimg the 21465~5 .
steps of: inserting a catheter, at a point in tbe gingival sulcus between outer tooth surface and marginal gingiva, or through gingiva amd cortical plate, to a 1 depth; and injecting medication or: ' through said catneter.
Ad~ " the system of the present imvention proYide users with a more secure 5 and less painful method and device for direct access for injecting medication to a target area imto the cortical plate of the bone.
In addition, the systRm facilitatRs a~d adds a level of security previously unavailable for the anaesthetic in tbat it has a sure and immediate effect.
Another advantage of tbis system is tihat it provides benefits to the dentists by 10 facilitating the use of a low cost, d~sposable device.
Still another advantage of this inven~ion is that the risk of ~ is lower than with the current dRYiCeS. This is because the dRvice is disposable and because tne risk of the den~al equipment used with thR device of the invention becoming, is low.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the inYention will become more apparent from the 21~6S~5 .
following description of the preferred h ' , m which reference is made to the appended drawings, wherein:
Figure 1 illusù ates an exploded vie~ of the device showing the component pans and their inter~
5 Figure 2A illustrates the device assembled for drilling;
Figure 2B Illustrated a 1 ~ ' ' cross-section through the device illustrated in Figure 2A, taken along line A-A of Figure 2A;
Figure 3 shows a detailed view of t~le area marked on Figure 2B;
Figure 4 is a cross-sectional view of the body of the perforator taken along lines B-B
10 of Figure 2;
Figure S is a cross ~liu~l view of the adaptor body;
Figure 6 is a cross-sectional view of the cap;
Figure 7A - 7C illuslrate the method according to the invention, Figure 7A shows the device drillmg in the bone tissue; Figure 7B s~ows the perforator inserted into the ~- 21~ 5 bone ~ssue and the adaptor de-couE~led; and Figure 7C shows the perforator inserted into the bone tissue as a catheter and a h",~,' needle set for delivering an injection;
Figure 8 illustrates another of the invention;
5 Figure 9 illustrates an alternative method of delivery medication to treat a root-canal nene; and Figure 10 illustrates from a plan vie~A/ the point of catheter insertion for the aEternative method shown in Figure 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
10 Figure I illustrates am exploded vie~v of the device showing the component parts and tneir inter-l~ , . The device comprises a perforator 1, an adaptor 3 and a cap 5.
The perforator 1 has a bevelled driE:ling needle 7 whic~ is used both as a drill and a catheter. Needle 7 is bevelled at bo~h ends, as better shown on Figure 2B. The first 15 end 9 is formed as a drilling tip in that it has cutting teeth along the edge, as sho~vn in Figure 3. The second end 11 is tlevelled for receiving a id directing the needle of 2146S~
a l~ o~l syringe and for easy ~oupling with tbe adaptor 3, as will be seen later.
A flange 13 is fn~ed on the needle al~out the second end 11, so that the needle passes along the æ axis of the flange 13. The flange 13 is r ' ~ or ;noulded of a plastic or other material, and it has a generally cylindrical outer shape.
S Tbis shape is preferred as the flange 13 rotates together wit~ the needle 7 for drilling.
Variations of tne shape illustrated in the attached drawings may also be . ' The flange 13 is adapted for receiv~mg cap S at one end and for coupling with the adaptor 3 at the otber end. As an e~lmple, a collar 15 ntay Ibe provided on the flange 13 so tbat the cap 5 holds over the ~ollar 15 when pressed. The cap S is needed to 10 protect and cover the tip 9 of the needle 7 before use and when the device is dispose~
of.
For ease of , ' the internal diameter of the cap 5 amd the e~ternal diameter of tbe collar IS should be as large as is reasonable and preferably between 10 to 20 times gre~ter than the diameter of th~ needle 7. Anotber advantage of the collar IS
15 is tbat it provides a stop to limit the d~pths of penetration of the needle 7. The flange 13 is shaped to form an inner a~ial shaft 17 projecting from the centre of the collar 15, and a female connector 19 for coupling witlt a ~u.., . - v male connector provided in the adaptor 3.
~ 21~6~8~
The coupling between the perforator and the adaptor is il!ustrated on Figures 2B, 4 and S. Figure 2B shows a r ~ sectiorl of a female connector 19 provided in the flange 13 and a male connector 21 provided in the adaptor 3. Figure 4 illust~ates a cross-section of an e~cemptary fernale connector 19, while Figute 5 shows a cross-section of the COI~ -r " v male connector 21. The male connector is provided with radial ribs 23, e~tending towards tibe centre but not meeting to leave room for the cen'¢al shaft 17, while ~ grooves 25 ate provided in the fetnale connector, alternating with islands 20. The fettlale contlector is also formed with a clearance ring æ for r- ~ " ~ the thicknes~~ of tne body 29 of the adaptor.
The tubular shaft 17 forms a reinfolced passage for drilling needle 7. The shaft also provides enough contact surface between the drilling ncedle and the body to ensure that these two parts rotate together ~uring drilling. As could be seen on Figure 2B, end 11 of the needle is bevelled amll extends a little over the shaft 17, but there is a clear~mce between the tip of end 11 amd the male cotunector when the device is assembled for drilling.
When rotated, the drilling needle 7 penetrates in the bone tissue through gingiva or ligament and dtills a hole with the CUItting tip 9. Ille perforator I may remain in place as a catheter, wit~ the drilling neeclle itlsertcd into the bone. Tnen, a h~"od needle tnay be introduced tbrough the passage of drilling necdle 7 to inject a directly into the bone. Therefore, the drilling needle 7 is selected to have ~ 2146~S
a wide enough passage for allowin~ a h~' needle with a smaller gauge to be inserted through needle 7.
The adaptor 3 has tbree functions. Firstly, the adaptor conveys the rotational movement from a dental hand piece or the like to the perforator. As well, the adaptor 5 is provided with means for blocking bone debris for enteriDg into the syringe passage and also aligns amd reinforces the needle 7 during drilling.
The adaptor includes a rod 27, a ba~y 29 and a shank 31.
Body 29 includes male connector 21 which is formed, as indicated above, with ribs ~3 which couple ~vith grooves 25 of the female conmector 19 for 10 driYing needle 7. The sb~nk 31 e~aends along the axis of the adaptor and is formed with a joint 33 for attachment with ~ ~ v or straigbt hand piece. The shank 31 has a groove 35 and a cut-out 37 to fL~ the shank in place m the known manner.
Generally, the shank tr,msmits to the needle 7 t~e rotational movement from the hand piece.
15 The shank 31 also acts as a barrier for, at it is generally thought that bacteria is reluctant to change direction, and there are a plurality of 90 angles between the tip g of drilling needle 7 and the joint 33.
2146~8~
The rod 27 has tne diameter and lellgth selected in accordance with the size of needle 7. The rod 27 is fL~ed in the ,, ' centre of body 29 so as to readily penetrate into the hollow passage of the needle, when the device is assembled for drilling.
When the rod 27 is inserted witbin Ihe needle passage, it advances through the length S of the needle up to the bevelled end, as shown on Figures 2A and 3 im dotted lines.
In this way, the debris from drilling calmot perletrate to block the needle passage. In addition, the rod gives additional ri,gidity, strength and alignment to needle 7 during drilling. The rod also advances thrl)ugh the a portion of the sbank as is illustrated in Figure 2B in dotted lines.
10 Figure 8 illustrates an alternative; ' " of the present invention. In tbis variamt, body 13 is provided with an internal ~hread while body 29 is provided with a matching e~ternal thread. By threading one to the other amd using the central rod 27 to align the two bodies together, the perforator could be driven by tlle band piece in a similar manner as in the variamt disclosed above. Of course, the thread is gomg in am 15 opposite direction to the direction of rotatiori of the device for avoiding ~"
of the two bodies.
An alternative method of targeted ~lelivery is shown im Figures 9 and 10. The perforator 7 is inserted at a point 30 between teetn, para~lel to the tooth 31 m treatment, and penetrates through gingiva~ sulcus 32 amd ligament 33 to a depth near 20 the entry of the nerve, artery and vein bumdle 34 through the bone 35 and into the 21~6S~
tooth-root canal 36. This method of targeb~d delivery, say, of ' is suitable, where I ~c " vertical to the b~oth through gingiva and corLical bone is not convenient or possible; as in the case of rear molars.
There are a variety of ways that this iLlvention can be devised but the end result is to 5 perform ~ ' ' intra~sseous dl~livery system.
The device of this invention operates as follows:
First, a site for the injection is selecbod by the I . The gingiva over the injection side is disinfected and bopically I ' ' A small amount of anaesthe~ic solution is injected until blanching of the tissue, a~d this will ' the gingiva 10 and the I The following operations are illust~ated in Figures 7A, 7B and 7C, and Figures 9 and 10.
As can be seen in Figure 7A, tne bevelled end 9 of the needle 7 is placed against the gingiva and shank 31 is attached wibh joint 33 to a contra angle or to a straight dental 15 hand piece. The adaptor and perfolator are coupled for drilling. The perforator should be held F , " to the cortical plate, or if not possible or ~ ~. t, it should be held vertical and parallel to the long a~is of the tooth as shown in Figure 9, having been inserted between teeth as shown in Figure 10. The perforator is then operabod in small bursts of rotation from the hand piece ~mtil resistlmce is no longer 214G~85 felt, as is well known to dentists.
Next, tbe adaptor 3 is remoYed fro~, the ~ ~ with perforator I by applying pressure to the body 13 with the fingers thus keeping the needle 7 in the perforated cortical plate. This is shown in Figure 7B.
5 The presence of the needle 7 m the cl~rtical plate, or down the side of tbe tooth as in Figure 9, allows an mjection to be made without: . ' ' vle~, to find the in the case of floating gingiva or the free or marginal gingiva. Figure 7C
illustrates the next step, namely ho~v tbe mjec~ion needle is inserted tbrough the perforator I for delivering the anaes~letic solution required.
10 The last step is to remove the perfor;ltor I from the cortical plate and reinstall the cover cap 5 over the needle 7, then insert the adaptor to the pe~forator making the unit complete and disposable. The cap 5 pl~ovides a means whereby the apparatus may be removed from the dental hand piece without amy risk of the user being in co~tact with body fluids which will be present on th~ needle after use. This is extremely important 15 L ' 'y since tbere may be a risk of contacting Aids or Hepatitis should the user ~' ' "~, prick a finger with the needle. It is therefore desirable that the cap should be of a hard or rigid rubber or plastic material not easily penetrated by the needle.
An example of a method used curr~ntly in dentistry is the iDfiltration method, whereby a local anaesthetic solution is mjected into the soft tissue of gingiva. In doing so, the 15 solution eventually passes tbrough ~he corlical plate affecting the nerve bundle entering 21~6~5 .
the tooth. Di~d. ~ of tbis m~thod include tne delay of onset of anaesthesia after the injection and, m most cases, b;lllooning of tbe injected tissue. As well, there is an e~tended period of time for recovery of the tissue until ~eturn to normal condition.
Another method which is culren~dy used is the regional block method whereby an 5 anaesthetic solution is imjected locally in proximity to the nerve trunk as it eAters the bone. D " ~ of this procedure are that it is extremely difficult to locate the nerve trunk, there is discomfort to the patient and a delay for the anaesthetic to t~ke effect. As im the case of the infi~ltration method, this method a long recovery period for tissue to retur n to normal.
0 At present, two types of appar,itus have been used to perform intra-osseous These are surgical bul s used to perforate the cortical plate and the villet mjectors.
The use of a surgica'l bur has ~ in that burs are e~pensive and they bave to be sterilized between uses or a new bur used each time. In addition, the method 15 is slo v, requiring the atiached gingiva amd periosteum to be ' before the cortical plate is perforated. The villet injector is an apparatns tbat serves both as a perforator and injector. It uses specially designed needles rotated by a cu.~
dental motor. A d i,~.d~ ~ of this device is that the needle often becomes clogged with pulverized bone which obstructs the passage in tbe needle and prevents mjection ` 21465~
of the anaesthetic solution. It is generally difficult to remove the clogging material from the needle and often the Illse of a second needle is necessary. Other d;~ of this method includ~ the initial capital cost of the instrument purchase, and the cost of the needles which ate somewhat expensive. In addition, the desig{t of S the instrument ~akes access to valious parts of the mouth difficul~ and sometiines .. .
Intra-osseous and targeted root-canal nerve ~ ' have not become popular for the reason that thete has not beerl a practical technique of making the injections ~u~rull~ . For e~ample, there hlls been a general belief that this method is radical 10 amd to be restored ~o only if nerve b~ock and infiltration anaesthetic do not . " -the desired result. However, intra-osseous amd targeted injections produce positive, more profound ~ ' amd could be made with less pain than either of the other types according to the present invelltion.
Targeted ' has several advantages over prior art nerve block or infil~ion 15 methods. There is no feeling of numbness in the tongue, cheek, or lips during or after the injection and there is no aftcr-pain. The anaesthetic is profound and acts '~ alleviating the necessity of waiting for the anaestbetic to take effect as with the nerve block amd infiltratiotl methods. r ~ ," as only a few drops of anaesthetic are injected, there is no ieeling of faintness or increasnng of the pulse rate.
21~6S85 To achieve targeted: ' one must gain access, if intra-osseous, to the c mcellous bone by going through the cortical layer; or to tbe bottom of the tooth, if root-camal targeted: ' is desired. Because of instant ' and profound pulpal ' there is a mu~,h greater control over the region one wishes to ' , resulting im a much smaller dose of ' , as well as, of course, other ' where applicabl(~.
United States Patent 5,173,050 (Di].lon) discloses a dental apparatus for ~. ~ ~ tbe cortical plate of human maxillary and ' ' ' bones. The apparatus of Dillon comprises a metal ne&dle moulded into a plastic shank. Tbe shank is being formedwith means for ~-~F-- with a dental hand piece for i ~ the rotational movement to the needle. The need,e used for drilling is solid and has a sharp bevelled free end. The apparatus described by Dillon is disposable.
However, the device disclosed in Dillon's patent cannot be used as a catheter for injecting anaesthetic by imserting a l~",o,' needle thro~gh the drilling needle. As well, tbe device disclosed by Dilloll is not provided with meams for blocking ent~y of bone debris into the ne&dle ~;...~,~,w~. In addition, the direct connection between the h~md piece and the perforator does not provide for a safe and reliable barrier against bacteria passimg from the ne&dle to the h;md piece.
United States Patent 3,534,476 (~rinters) discloses a driDing and fiDing root canal ~ 21~658~
apparatus. The dTilling is performled by a drill having a cent~al bore. The depth of the root canal is d ' in ad~lance and a stop is placed on the drill to limit the depth of drilling. The device is provided with a flexible rod which is pushed into the root canal so tbat the drill is directed along this road to follow the contour of the canal 5 so that resulting bore will have an uniform diameter which is free of shoulders or ledges The apparatns disclosed by Winters is concerned with enlarging the root canal after the ~erve bas been ext~acted. This apparatus is not used for injecting medication in close proximity to a targeted arl~a for treatment or -United States Patent 4,944,677 (A~exandre) discloses a smooth hollow needle with a10 bevelled point for drilling a hole into the jawbone near the apex of the tooth to be Thereafter, the drilling device 13 removed from the jaw, and a h~ needle of 'l~ the same gauge is irlserted into the hole amd is injected. Thus, ther~ is no catheti~ed delivery of , witn the attendant .' ". "t tbat the ple-drilled hole n~ay be difficult to locate when 15 inserting the h~. needle.
One -t, ~ 1~ older United Statt s patent that is discussed by Ale~andre (above) is United States Patent 2,317,648 (~Siqveland) granted im 1943. In addition to the mentioned by Alexlmdre, the fact tbat Siqveland teaches use of threaded sleeve which penetrates the bone d~ing drilling and is left (screwed) in the bone to 20 serve as a guide for insertion of tht actual injection needle. Due to the cost of such 21~6~85 a device, it cannot be made disposalble; but more ~ , for the threaded sleeve to be securely fastened in the bone il~ would have to rotate at a much slower speed than the drill (as in Siqveland) or the drilling catheter (as in tne present mvention).
SUMMAR~i~ 01; THE INVENTION
5 The present invention ,~av~ to mitigate tbe problems amd ~;~aJ~ ~ of delivering dental anaesthetic L .~ ~ id with the prior art methods amd devices.
The present invention provides a pe~forator having a central passage, which perforator then remains in place as a catheter for allowi~g a hyl,o~ - needle to be inser~ed through the passage to deliver the desired " The preferred apparatus is 10 provided with means for obstructmll the entry of debris in the perforator's passage.
According to an apparatus aspect ~lf the present mvention, a device for cathetized delivery of medication comprises: a hollow drilling catheter means for penetrating ligament, tissue or bone amd adapte~i to remain in place after dtilling; and means for engaging and ~ , e tne drilling catheter to amd from a rotary drive shaft.
15 In a further aspect, the rotaty drive shaft comprises an axial rod adapted to be inser~ed into the hollow drillimg catheter wh~ n engaging it.
21~6~8~
.
According to another aspect of the present invention, there is provided a device for pc.~l~1i.5, the r ' ~ ' ~ ligamen~s, cortical plate of small bones, amd the like, for injecting substances at a y~ L~ ' site, ~ , ~ a perforator for drilling a hole mto the ligament, bone or tis~;ue, wherein said perforator is provided with an ilmer passage to form a catheter adapted to ren~un in the hole perforated for directing a h~l,od. needle to said pl~d~; I site, and an adaptor for latching in a latchinLg-tvpe powered dental handpiece for; ~ rotational movement to said perforator.
The . -k ~ d intra-osseous delivery system of the present invention comprises a 10 perforator with a bevelled drilling needle that is used as a drill and a catheter. The needle is attached at one end to a l~lastic or metal body. For drilling, the body is attached to a matching adaptor pro~ided with a drivimg shank which is rotated by a ~,.... contra angle or straight dental har,d piece. Then, the perforator is used as a catheter, whereby a h~ ' needle is inserted tbrough the drilling needle 15 without losmg access to the already perforated bone.
In the preferred form of the inventil)n the apparatus is disposable. Before disposal, the perforator receives a cap over the needle for protection against accidental ~: of ~IIVil~
The present imvention also provides a method of medical treatment, comprisimg the 21465~5 .
steps of: inserting a catheter, at a point in tbe gingival sulcus between outer tooth surface and marginal gingiva, or through gingiva amd cortical plate, to a 1 depth; and injecting medication or: ' through said catneter.
Ad~ " the system of the present imvention proYide users with a more secure 5 and less painful method and device for direct access for injecting medication to a target area imto the cortical plate of the bone.
In addition, the systRm facilitatRs a~d adds a level of security previously unavailable for the anaesthetic in tbat it has a sure and immediate effect.
Another advantage of tbis system is tihat it provides benefits to the dentists by 10 facilitating the use of a low cost, d~sposable device.
Still another advantage of this inven~ion is that the risk of ~ is lower than with the current dRYiCeS. This is because the dRvice is disposable and because tne risk of the den~al equipment used with thR device of the invention becoming, is low.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the inYention will become more apparent from the 21~6S~5 .
following description of the preferred h ' , m which reference is made to the appended drawings, wherein:
Figure 1 illusù ates an exploded vie~ of the device showing the component pans and their inter~
5 Figure 2A illustrates the device assembled for drilling;
Figure 2B Illustrated a 1 ~ ' ' cross-section through the device illustrated in Figure 2A, taken along line A-A of Figure 2A;
Figure 3 shows a detailed view of t~le area marked on Figure 2B;
Figure 4 is a cross-sectional view of the body of the perforator taken along lines B-B
10 of Figure 2;
Figure S is a cross ~liu~l view of the adaptor body;
Figure 6 is a cross-sectional view of the cap;
Figure 7A - 7C illuslrate the method according to the invention, Figure 7A shows the device drillmg in the bone tissue; Figure 7B s~ows the perforator inserted into the ~- 21~ 5 bone ~ssue and the adaptor de-couE~led; and Figure 7C shows the perforator inserted into the bone tissue as a catheter and a h",~,' needle set for delivering an injection;
Figure 8 illustrates another of the invention;
5 Figure 9 illustrates an alternative method of delivery medication to treat a root-canal nene; and Figure 10 illustrates from a plan vie~A/ the point of catheter insertion for the aEternative method shown in Figure 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
10 Figure I illustrates am exploded vie~v of the device showing the component parts and tneir inter-l~ , . The device comprises a perforator 1, an adaptor 3 and a cap 5.
The perforator 1 has a bevelled driE:ling needle 7 whic~ is used both as a drill and a catheter. Needle 7 is bevelled at bo~h ends, as better shown on Figure 2B. The first 15 end 9 is formed as a drilling tip in that it has cutting teeth along the edge, as sho~vn in Figure 3. The second end 11 is tlevelled for receiving a id directing the needle of 2146S~
a l~ o~l syringe and for easy ~oupling with tbe adaptor 3, as will be seen later.
A flange 13 is fn~ed on the needle al~out the second end 11, so that the needle passes along the æ axis of the flange 13. The flange 13 is r ' ~ or ;noulded of a plastic or other material, and it has a generally cylindrical outer shape.
S Tbis shape is preferred as the flange 13 rotates together wit~ the needle 7 for drilling.
Variations of tne shape illustrated in the attached drawings may also be . ' The flange 13 is adapted for receiv~mg cap S at one end and for coupling with the adaptor 3 at the otber end. As an e~lmple, a collar 15 ntay Ibe provided on the flange 13 so tbat the cap 5 holds over the ~ollar 15 when pressed. The cap S is needed to 10 protect and cover the tip 9 of the needle 7 before use and when the device is dispose~
of.
For ease of , ' the internal diameter of the cap 5 amd the e~ternal diameter of tbe collar IS should be as large as is reasonable and preferably between 10 to 20 times gre~ter than the diameter of th~ needle 7. Anotber advantage of the collar IS
15 is tbat it provides a stop to limit the d~pths of penetration of the needle 7. The flange 13 is shaped to form an inner a~ial shaft 17 projecting from the centre of the collar 15, and a female connector 19 for coupling witlt a ~u.., . - v male connector provided in the adaptor 3.
~ 21~6~8~
The coupling between the perforator and the adaptor is il!ustrated on Figures 2B, 4 and S. Figure 2B shows a r ~ sectiorl of a female connector 19 provided in the flange 13 and a male connector 21 provided in the adaptor 3. Figure 4 illust~ates a cross-section of an e~cemptary fernale connector 19, while Figute 5 shows a cross-section of the COI~ -r " v male connector 21. The male connector is provided with radial ribs 23, e~tending towards tibe centre but not meeting to leave room for the cen'¢al shaft 17, while ~ grooves 25 ate provided in the fetnale connector, alternating with islands 20. The fettlale contlector is also formed with a clearance ring æ for r- ~ " ~ the thicknes~~ of tne body 29 of the adaptor.
The tubular shaft 17 forms a reinfolced passage for drilling needle 7. The shaft also provides enough contact surface between the drilling ncedle and the body to ensure that these two parts rotate together ~uring drilling. As could be seen on Figure 2B, end 11 of the needle is bevelled amll extends a little over the shaft 17, but there is a clear~mce between the tip of end 11 amd the male cotunector when the device is assembled for drilling.
When rotated, the drilling needle 7 penetrates in the bone tissue through gingiva or ligament and dtills a hole with the CUItting tip 9. Ille perforator I may remain in place as a catheter, wit~ the drilling neeclle itlsertcd into the bone. Tnen, a h~"od needle tnay be introduced tbrough the passage of drilling necdle 7 to inject a directly into the bone. Therefore, the drilling needle 7 is selected to have ~ 2146~S
a wide enough passage for allowin~ a h~' needle with a smaller gauge to be inserted through needle 7.
The adaptor 3 has tbree functions. Firstly, the adaptor conveys the rotational movement from a dental hand piece or the like to the perforator. As well, the adaptor 5 is provided with means for blocking bone debris for enteriDg into the syringe passage and also aligns amd reinforces the needle 7 during drilling.
The adaptor includes a rod 27, a ba~y 29 and a shank 31.
Body 29 includes male connector 21 which is formed, as indicated above, with ribs ~3 which couple ~vith grooves 25 of the female conmector 19 for 10 driYing needle 7. The sb~nk 31 e~aends along the axis of the adaptor and is formed with a joint 33 for attachment with ~ ~ v or straigbt hand piece. The shank 31 has a groove 35 and a cut-out 37 to fL~ the shank in place m the known manner.
Generally, the shank tr,msmits to the needle 7 t~e rotational movement from the hand piece.
15 The shank 31 also acts as a barrier for, at it is generally thought that bacteria is reluctant to change direction, and there are a plurality of 90 angles between the tip g of drilling needle 7 and the joint 33.
2146~8~
The rod 27 has tne diameter and lellgth selected in accordance with the size of needle 7. The rod 27 is fL~ed in the ,, ' centre of body 29 so as to readily penetrate into the hollow passage of the needle, when the device is assembled for drilling.
When the rod 27 is inserted witbin Ihe needle passage, it advances through the length S of the needle up to the bevelled end, as shown on Figures 2A and 3 im dotted lines.
In this way, the debris from drilling calmot perletrate to block the needle passage. In addition, the rod gives additional ri,gidity, strength and alignment to needle 7 during drilling. The rod also advances thrl)ugh the a portion of the sbank as is illustrated in Figure 2B in dotted lines.
10 Figure 8 illustrates an alternative; ' " of the present invention. In tbis variamt, body 13 is provided with an internal ~hread while body 29 is provided with a matching e~ternal thread. By threading one to the other amd using the central rod 27 to align the two bodies together, the perforator could be driven by tlle band piece in a similar manner as in the variamt disclosed above. Of course, the thread is gomg in am 15 opposite direction to the direction of rotatiori of the device for avoiding ~"
of the two bodies.
An alternative method of targeted ~lelivery is shown im Figures 9 and 10. The perforator 7 is inserted at a point 30 between teetn, para~lel to the tooth 31 m treatment, and penetrates through gingiva~ sulcus 32 amd ligament 33 to a depth near 20 the entry of the nerve, artery and vein bumdle 34 through the bone 35 and into the 21~6S~
tooth-root canal 36. This method of targeb~d delivery, say, of ' is suitable, where I ~c " vertical to the b~oth through gingiva and corLical bone is not convenient or possible; as in the case of rear molars.
There are a variety of ways that this iLlvention can be devised but the end result is to 5 perform ~ ' ' intra~sseous dl~livery system.
The device of this invention operates as follows:
First, a site for the injection is selecbod by the I . The gingiva over the injection side is disinfected and bopically I ' ' A small amount of anaesthe~ic solution is injected until blanching of the tissue, a~d this will ' the gingiva 10 and the I The following operations are illust~ated in Figures 7A, 7B and 7C, and Figures 9 and 10.
As can be seen in Figure 7A, tne bevelled end 9 of the needle 7 is placed against the gingiva and shank 31 is attached wibh joint 33 to a contra angle or to a straight dental 15 hand piece. The adaptor and perfolator are coupled for drilling. The perforator should be held F , " to the cortical plate, or if not possible or ~ ~. t, it should be held vertical and parallel to the long a~is of the tooth as shown in Figure 9, having been inserted between teeth as shown in Figure 10. The perforator is then operabod in small bursts of rotation from the hand piece ~mtil resistlmce is no longer 214G~85 felt, as is well known to dentists.
Next, tbe adaptor 3 is remoYed fro~, the ~ ~ with perforator I by applying pressure to the body 13 with the fingers thus keeping the needle 7 in the perforated cortical plate. This is shown in Figure 7B.
5 The presence of the needle 7 m the cl~rtical plate, or down the side of tbe tooth as in Figure 9, allows an mjection to be made without: . ' ' vle~, to find the in the case of floating gingiva or the free or marginal gingiva. Figure 7C
illustrates the next step, namely ho~v tbe mjec~ion needle is inserted tbrough the perforator I for delivering the anaes~letic solution required.
10 The last step is to remove the perfor;ltor I from the cortical plate and reinstall the cover cap 5 over the needle 7, then insert the adaptor to the pe~forator making the unit complete and disposable. The cap 5 pl~ovides a means whereby the apparatus may be removed from the dental hand piece without amy risk of the user being in co~tact with body fluids which will be present on th~ needle after use. This is extremely important 15 L ' 'y since tbere may be a risk of contacting Aids or Hepatitis should the user ~' ' "~, prick a finger with the needle. It is therefore desirable that the cap should be of a hard or rigid rubber or plastic material not easily penetrated by the needle.
Claims (21)
1. A device for cathetized delivery of medication comprises:
a hollow drilling catheter means for penetrating ligament, tissue or bone and adapted to remain in place after drilling; and means for engaging and the drilling catheter to and from a rotary drive shaft.
a hollow drilling catheter means for penetrating ligament, tissue or bone and adapted to remain in place after drilling; and means for engaging and the drilling catheter to and from a rotary drive shaft.
2. A device as claimed in claim 1, wherein the rotary drive shaft comprises:
an axial rod adapted to be inserted into the hollow drilling catheter when engaging it.
an axial rod adapted to be inserted into the hollow drilling catheter when engaging it.
3. A device for perforating the periodontal ligaments, cortical plate of small bones, and the like, for injecting substances at a predetermined site, comprising:
a perforator for drilling a hole into the ligament, bone or tissue, wherein said perforator is provided with an inner passage to form a catheter adapted to remain in the hole perforated for directing a hypodermic needle to said predetermined site, and an adaptor for latching in a latching-type powered dental handpiece for transmitting rotational movement to said perforator.
a perforator for drilling a hole into the ligament, bone or tissue, wherein said perforator is provided with an inner passage to form a catheter adapted to remain in the hole perforated for directing a hypodermic needle to said predetermined site, and an adaptor for latching in a latching-type powered dental handpiece for transmitting rotational movement to said perforator.
4. A catheterized intra-osseous delivery system comprising:
a perforator with a bevelled drilling needle that is used as a drill and a catheter; said needle attached at one end to a plastic or metal flange, which is attached to a matching adaptor provided with a driving shank to be rotated by a conventional contra angle or straight dental hand piece; whereby the perforator is used as a catheter for a hypedermic needle to be inserted through the drilling needle without losing access to the already perforated bone.
a perforator with a bevelled drilling needle that is used as a drill and a catheter; said needle attached at one end to a plastic or metal flange, which is attached to a matching adaptor provided with a driving shank to be rotated by a conventional contra angle or straight dental hand piece; whereby the perforator is used as a catheter for a hypedermic needle to be inserted through the drilling needle without losing access to the already perforated bone.
5. An apparatus as claimed m claim 3 and claim 4, wherein the apparatus is disposable, and the perforator receives a cap over the needle for protection against accidental contamination of environment.
6. A method of medical treatment, comprising the steps of:
inserting a catheter, at a point in the gingival sulcus between outer tooth surface and marginal gingiva, or through gingiva and cortical plate, to a predetermined depth; and injecting medication of through said catheter.
inserting a catheter, at a point in the gingival sulcus between outer tooth surface and marginal gingiva, or through gingiva and cortical plate, to a predetermined depth; and injecting medication of through said catheter.
7. A device as claimed in claim 1, wherein said perforator comprises:
a first connector formed inside a first body of a generally cylindrical outer shape, for cooperation with said adaptor;
a drilling needle extending from said first body along the rotational axis of said first body and opposed to said first connector, said needle being fixed to said first body.
a first connector formed inside a first body of a generally cylindrical outer shape, for cooperation with said adaptor;
a drilling needle extending from said first body along the rotational axis of said first body and opposed to said first connector, said needle being fixed to said first body.
8. A device as claimed in claim 1, wherein said adaptor comprises:
a second connector formed inside a second body of a generally cylindrical outer shape;
a driving shank extending along the rotational axis of said second body, said shank having an end fixed to said second body opposite to said second connector, and a free end adapted to receive a rotational movement; and a rod extending along the rotational axis of said second body in an opposite direction to said driving shank, said rod sized to fit into the passage of said needle.
a second connector formed inside a second body of a generally cylindrical outer shape;
a driving shank extending along the rotational axis of said second body, said shank having an end fixed to said second body opposite to said second connector, and a free end adapted to receive a rotational movement; and a rod extending along the rotational axis of said second body in an opposite direction to said driving shank, said rod sized to fit into the passage of said needle.
9. A device as claimed in claim 3, wherein said first and said second connectors are provided with complementary configurations for engagement to each other when moved along the rotational axis towards each other.
10. A device as claimed in claim 2, wherein said needle has a drilling length and a attachment length, and a passage sized to accommodate a hypodermic needle of a smaller gauge.
11. A device as claimed in claim 8, wherein said drilling length ends with a cutting edge.
12. A device as claimed in claim 9 wherein said cutting edge is bevelled.
13. A device as claimed in claim 9, or 10 wherein said cutting edge is provided with cutting teeth along the circumference.
14. A device as claimed in claim 8, wherein said attachment length ends with a catheter end.
15. A device as claimed in claim 12, wherein said catheter end is bevelled.
16. A device as claimed in claim 8, wherein said attachment length is received in a central shaft provided in said first body for increasing the surface of attachment between said needle and said first body.
17. A device as claimed in claim 6, wherein said rod comprises:
a anchoring part incorporated and fixed into said shank, for driving said rod to rotate with said shank; and a free part of a length selected to extend up to the beginning of the bevelled tip of said needle when the rod is inserted into said needle, for blocking entrance of debris resulting during bone perforation.
a anchoring part incorporated and fixed into said shank, for driving said rod to rotate with said shank; and a free part of a length selected to extend up to the beginning of the bevelled tip of said needle when the rod is inserted into said needle, for blocking entrance of debris resulting during bone perforation.
18. A device as claimed in claim 1, further comprising a protection cap for shielding said drilling tip during storage.
19. A device as claimed in claim 2, wherein said first body is provided with means for receiving and securing a protective cap over said needle.
20. A device as claimed in claim 17, wherein said means for securing comprises a disc centred about said needle and fixed on said first body for receiving said protection cap.
21. A device for perforating the cortical plate of small bones for injecting substances at a predetermined site, comprising:
a perforator for drilling a cavity into the cortical plate of the bone tissue; and am adaptor for latching in a latching-type powered dental handpiece for transmitting rotational movement to said perforator.
a perforator for drilling a cavity into the cortical plate of the bone tissue; and am adaptor for latching in a latching-type powered dental handpiece for transmitting rotational movement to said perforator.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002146585A CA2146585A1 (en) | 1995-04-07 | 1995-04-07 | Catheterized, targeted infusion of medication |
| US08/471,372 US5762639A (en) | 1995-04-07 | 1995-06-06 | Device for targeted, catherized delivery of medications |
| EP96908946A EP0957788B1 (en) | 1995-04-07 | 1996-04-04 | Targeted needle drug administration |
| AU52634/96A AU5263496A (en) | 1995-04-07 | 1996-04-04 | Targeted catheter drug administration |
| PCT/CA1996/000203 WO1996031164A1 (en) | 1995-04-07 | 1996-04-04 | Targeted catheter drug administration |
| DE69633743T DE69633743T2 (en) | 1995-04-07 | 1996-04-04 | Targeted administration of a drug with a needle |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002146585A CA2146585A1 (en) | 1995-04-07 | 1995-04-07 | Catheterized, targeted infusion of medication |
| US08/471,372 US5762639A (en) | 1995-04-07 | 1995-06-06 | Device for targeted, catherized delivery of medications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2146585A1 true CA2146585A1 (en) | 1996-10-08 |
Family
ID=25677888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002146585A Abandoned CA2146585A1 (en) | 1995-04-07 | 1995-04-07 | Catheterized, targeted infusion of medication |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5762639A (en) |
| AU (1) | AU5263496A (en) |
| CA (1) | CA2146585A1 (en) |
| WO (1) | WO1996031164A1 (en) |
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| US1123730A (en) * | 1912-09-13 | 1915-01-05 | Edwin J Greenfield | Annular bone-saw. |
| US2317648A (en) * | 1941-07-08 | 1943-04-27 | Ivar E Siqveland | Process and apparatus for producing intraosseous anesthesia |
| US4356828A (en) * | 1980-03-03 | 1982-11-02 | Khosrow Jamshidi | Bone marrow aspiration needle |
| US4306570A (en) * | 1980-08-20 | 1981-12-22 | Matthews Larry S | Counter rotating biopsy needle |
| US4678471A (en) * | 1985-08-22 | 1987-07-07 | Noble Philip C | Method and apparatus for preventing rotational failure of orthopedic endoprostheses |
| US4747824A (en) * | 1986-05-30 | 1988-05-31 | Spinello Ronald P | Hypodermic anesthetic injection method |
| IE871308L (en) * | 1987-05-19 | 1988-11-19 | Schreiber Foods Inc | Dental cortical plate perforator |
| US4944677A (en) * | 1987-06-29 | 1990-07-31 | Raymond Joseph Alexandre | Intraosseus dental anesthesia apparatus and method |
| US4969870A (en) * | 1989-06-07 | 1990-11-13 | The Regents Of The University Of California | Method and apparatus for intraosseous infusions |
| US5341816A (en) * | 1989-11-06 | 1994-08-30 | Allen William C | Biopsy device |
| US5261877A (en) * | 1991-07-22 | 1993-11-16 | Dow Corning Wright | Method of performing a thrombectomy procedure |
| US5332398A (en) * | 1992-02-01 | 1994-07-26 | Board Of Regents, The University Of Texas System | Intramedullary catheter |
| US5312345A (en) * | 1992-03-11 | 1994-05-17 | Cole Richard D | Anti-needle stick protective inner blunt tubular stylet for intravenous therapy |
| SE470177B (en) * | 1992-03-23 | 1993-11-29 | Radi Medical Systems | Device for punching in hard tissue and puncture needle |
| DE4229310A1 (en) * | 1992-09-02 | 1994-03-10 | Winter & Ibe Olympus | Medical instrument for creating a tissue channel |
| US5372583A (en) * | 1992-11-25 | 1994-12-13 | Cardiopulmonary Specialities, Inc. | Bone marrow infuser and method of use |
| US5354299A (en) * | 1992-12-07 | 1994-10-11 | Linvatec Corporation | Method of revising a screw in a tunnel |
| US5423823A (en) * | 1993-02-18 | 1995-06-13 | Arthrex Inc. | Coring reamer |
| US5312375A (en) * | 1993-06-28 | 1994-05-17 | Simon Gurmarnik | Set for spinal anesthesia |
-
1995
- 1995-04-07 CA CA002146585A patent/CA2146585A1/en not_active Abandoned
- 1995-06-06 US US08/471,372 patent/US5762639A/en not_active Expired - Fee Related
-
1996
- 1996-04-04 WO PCT/CA1996/000203 patent/WO1996031164A1/en active IP Right Grant
- 1996-04-04 AU AU52634/96A patent/AU5263496A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU5263496A (en) | 1996-10-23 |
| US5762639A (en) | 1998-06-09 |
| WO1996031164A1 (en) | 1996-10-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |