WO2009128074A1 - Endosseous implant with interior and exterior threads - Google Patents

Endosseous implant with interior and exterior threads Download PDF

Info

Publication number
WO2009128074A1
WO2009128074A1 PCT/IL2009/000414 IL2009000414W WO2009128074A1 WO 2009128074 A1 WO2009128074 A1 WO 2009128074A1 IL 2009000414 W IL2009000414 W IL 2009000414W WO 2009128074 A1 WO2009128074 A1 WO 2009128074A1
Authority
WO
WIPO (PCT)
Prior art keywords
anchoring portion
interior
threads
exterior
implant
Prior art date
Application number
PCT/IL2009/000414
Other languages
French (fr)
Inventor
Idan Tobis
Nir Tobis
Original Assignee
Tavor [I.T.N] Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tavor [I.T.N] Ltd. filed Critical Tavor [I.T.N] Ltd.
Publication of WO2009128074A1 publication Critical patent/WO2009128074A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
    • A61C8/0022—Self-screwing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
    • A61C8/0037—Details of the shape
    • A61C8/0039—Details of the shape in the form of hollow cylinder with an open bottom
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00004—(bio)absorbable, (bio)resorbable, resorptive

Definitions

  • This invention relates to medical devices, and more specifically to endosseous implants.
  • osseointegration namely the creation of new, healthy bone tissue over most of the implant surface, with no fibrous tissue between them. It has been proposed that the biological process leading to and maintaining osseointegration is dependent upon a number of factors which include, amongst others, the surface area of the implant available for interaction. This is mainly dependant upon the geometry of the implant; its length and diameter, and the thread pitch and width.
  • the present invention provides an endosseous implant.
  • the implant of the invention comprises a hollow, open-ended cylindrical or conical component which is provided with screw threads on an interior surface of the cylindrical or conical component as well as screw threads on an exterior surface of the cylindrical or conical component.
  • the presence of the interior and exterior threads presents an increased surface area available for osseointegration in comparison to implants having only external threads.
  • the increased surface area tends to increase the short term fixation force by doubling the number of screw threads for a given screw length and diameter.
  • the device of the present invention can be used as a dental implant, bone anchor, bone screw or any other bone fixation device.
  • the invention provides a device for endosseous implantation comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads.
  • the invention also provides a method for deploying a device for endosseous implantation, the device comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads, the method comprising forming a cylindrical cavity in a bone tissue and screwing the anchoring portion of the device into the cavity.
  • Figs. Ia, Ib, and Ic show an endosseous implant in accordance with one embodiment of the invention
  • Fig. 2 shows the implant of Fig. 1 after insertion into bone tissue; and Fig. 3a, 3b, and 3c show an endosseous implant in accordance with another embodiment of the invention.
  • Fig. 1 shows an endosseous implant 2 in accordance with one embodiment of the invention.
  • the implant 2 is shown in perspective view in Figs. Ia and b, and in longitudinal sectional view in Fig. Ic.
  • the implant 2 comprises an anchoring portion 4 and a head portion 3 that in use emerges from the osseous tissue into which the anchoring portion 2 has been inserted.
  • the head portion 3 is adapted to receive a dental prosthesis, as is known in the art.
  • the anchoring portion 4 has a hollow cylindrical component enclosing a lumen 6.
  • the anchoring portion 4 has an exterior surface 8 that is provided with exterior threads 9.
  • the anchoring portion also has an interior surface 7 surrounding the lumen 6 that is provided with interior threads 11.
  • the interior and exterior threads have the same thread lead in order to allow screwing of the device into bone tissue.
  • the interior and exterior threads may have a different pitch resulting from a different number of thread starts (single, double, triple or quadruple threads), equally spaced around the periphery.
  • the implant 2 is deployed by screwing the anchoring portion 4 into bone tissue, such as an upper or lower jaw, a femur, a tibia or any other bone in the body.
  • Fig. 2 shows the implant 2 after implantation in bone tissue 10.
  • a cylindrical cavity 12 was pre-drilled in the bone tissue 10 using a hollow cylindrical drill bit.
  • the anchoring portion 2 is preferably self-tapping and may thus be screwed into the cavity 12.
  • the tissue 10 surrounds anchoring portion 4 and also occupies the lumen 6. In this way, both the interior threads and the exterior threads 9 are engaged by the bone tissue 10.
  • the implant 2 may be made from a biocompatible or osseointegrative material such as Stainless steel, Cobalt Chromium alloys, titanium, tantalum or niobium
  • the anchoring portion 2 may be coated with a. biocompatible osseointegrative ceramic material such as Zirconia or Titania.
  • the implant 2 is made from a bioabsorbable or biodegradeable material such as hydroxiapetite, polyglycolyc acid, polylactic acid, magnesium alloy or a combination of such materials.
  • Fig. 3 shows an endosseous implant 22 in accordance with another embodiment of the invention.
  • the implant 22 is shown in perspective view in Figs. 3a and b, and in longitudinal sectional view in Fig. 3c.
  • the implant 22 comprises an anchoring portion 24 and a head portion 23 that in use emerges from the osseous tissue into which the anchoring portion 24 has been inserted.
  • the head portion 23 is adapted to receive a dental prosthesis, as is known in the art.
  • the anchoring portion 24 has a hollow conical component enclosing a lumen 26.
  • the anchoring portion 24 has an exterior surface 28 that is provided with exterior threads 29.
  • the anchoring portion also has an interior surface 27 surrounding the lumen 26 that is provided with interior threads 21.
  • the interior and exterior threads have the same thread lead in order to allow screwing of the device into bone tissue.
  • the interior and exterior threads may have a different pitch resulting from a different number of thread starts (single, double, triple or quadruple threads), equally spaced around the periphery.
  • the implant 22 is deployed by screwing the anchoring portion 24 into bone tissue, such as an upper or lower jaw, a femur, a tibia or any other bone in the body.
  • bone tissue such as an upper or lower jaw, a femur, a tibia or any other bone in the body.
  • an appropriately shaped cavity can be pre-drilled in the bone tissue using a hollow drill bit.
  • the anchoring portion 22 is preferably self-tapping and may thus be screwed into the cavity.
  • the tissue will thus surround the anchoring portion 22 and also occupy the lumen 26. In this way, both the interior threads and the exterior threads 29 are engaged by the bone tissue.

Abstract

The invention provides a device for endosseous implantation. The device of the invention includes an anchoring portion having a hollow cylinder or cone having an exterior surface and an interior surface, where both surfaces are provided with screw threads. The interior and exterior threads present an increased surface area available for osseointegration in comparison to implants having only external threads. The increased surface area tends to increase the short term fixation force by doubling the number of screw threads for a given screw length and diameter. The device of the present invention can be used as a dental implant, bone anchor, bone screw or any other bone fixation device.

Description

ENDOSSEOUS IMPLANT WITH INTERIOR AND EXTERIOR THREADS
FIELD OF THE INVENTION
This invention relates to medical devices, and more specifically to endosseous implants.
BACKGROUND OF THE INVENTION Numerous medical procedures involve using an endosseous screw-shaped implant. These include, among others, dental implants, bone screws and bone anchors.
One of the most important factors in the fixation of these endosseous implants is osseointegration, namely the creation of new, healthy bone tissue over most of the implant surface, with no fibrous tissue between them. It has been proposed that the biological process leading to and maintaining osseointegration is dependent upon a number of factors which include, amongst others, the surface area of the implant available for interaction. This is mainly dependant upon the geometry of the implant; its length and diameter, and the thread pitch and width.
Another important factor in successful fixation of endosseous implants is the short term fixation strength between the implant and the bone, which determines how much load can be placed on the implant during the first period of healing after implantation, before osseointegration takes place. It is therefore known to increase the effective surface area of the implant, for example, by providing the implant with a rough surface, inclusion of transverse holes, grooves etc., using shallow thread teeth, or using bullet shaped screws. However, these devices often improve the long term fixation strength at the expense of short term fixation strength, thus prolonging the effective healing time. SUMMARY OF THE INVENTION
The present invention provides an endosseous implant. The implant of the invention comprises a hollow, open-ended cylindrical or conical component which is provided with screw threads on an interior surface of the cylindrical or conical component as well as screw threads on an exterior surface of the cylindrical or conical component. The presence of the interior and exterior threads presents an increased surface area available for osseointegration in comparison to implants having only external threads. The increased surface area tends to increase the short term fixation force by doubling the number of screw threads for a given screw length and diameter. The device of the present invention can be used as a dental implant, bone anchor, bone screw or any other bone fixation device.
Thus, in its first aspect, the invention provides a device for endosseous implantation comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads.
The invention also provides a method for deploying a device for endosseous implantation, the device comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads, the method comprising forming a cylindrical cavity in a bone tissue and screwing the anchoring portion of the device into the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to understand the invention and to see how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:
Figs. Ia, Ib, and Ic show an endosseous implant in accordance with one embodiment of the invention;
Fig. 2 shows the implant of Fig. 1 after insertion into bone tissue; and Fig. 3a, 3b, and 3c show an endosseous implant in accordance with another embodiment of the invention.
DETAILED DESCRIPTION OF EMBODIMENTS
Fig. 1 shows an endosseous implant 2 in accordance with one embodiment of the invention. The implant 2 is shown in perspective view in Figs. Ia and b, and in longitudinal sectional view in Fig. Ic. The implant 2 comprises an anchoring portion 4 and a head portion 3 that in use emerges from the osseous tissue into which the anchoring portion 2 has been inserted. The head portion 3 is adapted to receive a dental prosthesis, as is known in the art.
In the embodiment of Fig. 1 , the anchoring portion 4 has a hollow cylindrical component enclosing a lumen 6. The anchoring portion 4 has an exterior surface 8 that is provided with exterior threads 9. The anchoring portion also has an interior surface 7 surrounding the lumen 6 that is provided with interior threads 11. The interior and exterior threads have the same thread lead in order to allow screwing of the device into bone tissue. However, the interior and exterior threads may have a different pitch resulting from a different number of thread starts (single, double, triple or quadruple threads), equally spaced around the periphery.
The implant 2 is deployed by screwing the anchoring portion 4 into bone tissue, such as an upper or lower jaw, a femur, a tibia or any other bone in the body. Fig. 2 shows the implant 2 after implantation in bone tissue 10. A cylindrical cavity 12 was pre-drilled in the bone tissue 10 using a hollow cylindrical drill bit. The anchoring portion 2 is preferably self-tapping and may thus be screwed into the cavity 12. The tissue 10 surrounds anchoring portion 4 and also occupies the lumen 6. In this way, both the interior threads and the exterior threads 9 are engaged by the bone tissue 10.
The implant 2 may be made from a biocompatible or osseointegrative material such as Stainless steel, Cobalt Chromium alloys, titanium, tantalum or niobium
Alternatively or additionally, the anchoring portion 2 may be coated with a. biocompatible osseointegrative ceramic material such as Zirconia or Titania. In one embodiment, the implant 2 is made from a bioabsorbable or biodegradeable material such as hydroxiapetite, polyglycolyc acid, polylactic acid, magnesium alloy or a combination of such materials. - A -
Fig. 3 shows an endosseous implant 22 in accordance with another embodiment of the invention. The implant 22 is shown in perspective view in Figs. 3a and b, and in longitudinal sectional view in Fig. 3c. The implant 22 comprises an anchoring portion 24 and a head portion 23 that in use emerges from the osseous tissue into which the anchoring portion 24 has been inserted. The head portion 23 is adapted to receive a dental prosthesis, as is known in the art.
In the embodiment of Fig. 3, the anchoring portion 24 has a hollow conical component enclosing a lumen 26. The anchoring portion 24 has an exterior surface 28 that is provided with exterior threads 29. The anchoring portion also has an interior surface 27 surrounding the lumen 26 that is provided with interior threads 21. The interior and exterior threads have the same thread lead in order to allow screwing of the device into bone tissue. However, the interior and exterior threads may have a different pitch resulting from a different number of thread starts (single, double, triple or quadruple threads), equally spaced around the periphery.
The implant 22 is deployed by screwing the anchoring portion 24 into bone tissue, such as an upper or lower jaw, a femur, a tibia or any other bone in the body. As explained above in reference to the embodiment of Figs. 1 and 2, an appropriately shaped cavity can be pre-drilled in the bone tissue using a hollow drill bit. The anchoring portion 22 is preferably self-tapping and may thus be screwed into the cavity. The tissue will thus surround the anchoring portion 22 and also occupy the lumen 26. In this way, both the interior threads and the exterior threads 29 are engaged by the bone tissue.

Claims

CLAIMS:
1. A device for endosseous implantation comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads.
2. The device according to Claim 1 wherein the anchoring portion comprises an osseointegrative material.
3. The device according to Claim 1 or 2 wherein the osseo integrative material is a metal, an alloy, or a ceramic.
4. The device according to any one of the previous claims wherein the anchoring portion comprises a bioabsorbable material.
5. The device according to any one of the previous claims adapted for use as a dental implant.
6. The device according to any one of the previous claims adapted for use as a bone screw.
7. The device according to any one of the previous claims adapted for use as a bone anchor.
8. A method for deploying a device for endosseous implantation, the device comprising an anchoring portion, the anchoring portion comprising a hollow cylinder or cone having an exterior surface and an interior surface, wherein the interior surface is provided with interior screw threads and the exterior surface is provided with exterior screw threads, the method comprising forming a cylindrical cavity in a bone tissue and screwing the anchoring portion of the device into the cavity.
9. The method according to Claim 8 wherein the cylindrical cavity is formed using a hollow cylindrical drill bit.
PCT/IL2009/000414 2008-04-16 2009-04-16 Endosseous implant with interior and exterior threads WO2009128074A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7117308P 2008-04-16 2008-04-16
US61/071,173 2008-04-16

Publications (1)

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WO2009128074A1 true WO2009128074A1 (en) 2009-10-22

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102551901A (en) * 2011-12-12 2012-07-11 北京航空航天大学 Oral implantation method for improving jaw bearing mode and screw implant
KR102059960B1 (en) 2018-06-11 2019-12-30 장희지 Implant having a biodegradation material
WO2020046912A1 (en) * 2018-08-31 2020-03-05 Acuitive Technologies, Inc. Tendon interference anchor
US11246636B2 (en) 2019-04-26 2022-02-15 Braunvest Llc Systems, methods, and apparatus for spinal deformity correction
US11648000B2 (en) 2018-07-30 2023-05-16 Braunvest Llc Vertebral probes and related surgical methods

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2010095A (en) * 1977-12-09 1979-06-27 Riess Guido Dental implant
DE19713305A1 (en) * 1997-03-29 1998-10-01 Wilfried Prof Dr Med D Engelke Resorbable obturator for bone regeneration, requiring less preparation than titanium type
FR2831049A1 (en) * 2001-10-18 2003-04-25 Ldr Medical Osteosynthesis device comprising implants screwed into two vertebra and plate used to hold and displace the spine
US20050164146A1 (en) * 2004-01-28 2005-07-28 Cantor Stanton R. Anchoring element for use in bone
WO2007106774A2 (en) * 2006-03-13 2007-09-20 The Johns Hopkins University Orthopedic screw system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2010095A (en) * 1977-12-09 1979-06-27 Riess Guido Dental implant
DE19713305A1 (en) * 1997-03-29 1998-10-01 Wilfried Prof Dr Med D Engelke Resorbable obturator for bone regeneration, requiring less preparation than titanium type
FR2831049A1 (en) * 2001-10-18 2003-04-25 Ldr Medical Osteosynthesis device comprising implants screwed into two vertebra and plate used to hold and displace the spine
US20050164146A1 (en) * 2004-01-28 2005-07-28 Cantor Stanton R. Anchoring element for use in bone
WO2007106774A2 (en) * 2006-03-13 2007-09-20 The Johns Hopkins University Orthopedic screw system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102551901A (en) * 2011-12-12 2012-07-11 北京航空航天大学 Oral implantation method for improving jaw bearing mode and screw implant
KR102059960B1 (en) 2018-06-11 2019-12-30 장희지 Implant having a biodegradation material
US11648000B2 (en) 2018-07-30 2023-05-16 Braunvest Llc Vertebral probes and related surgical methods
WO2020046912A1 (en) * 2018-08-31 2020-03-05 Acuitive Technologies, Inc. Tendon interference anchor
US11246636B2 (en) 2019-04-26 2022-02-15 Braunvest Llc Systems, methods, and apparatus for spinal deformity correction

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