CA2454615A1 - Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue - Google Patents

Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue Download PDF

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Publication number
CA2454615A1
CA2454615A1 CA002454615A CA2454615A CA2454615A1 CA 2454615 A1 CA2454615 A1 CA 2454615A1 CA 002454615 A CA002454615 A CA 002454615A CA 2454615 A CA2454615 A CA 2454615A CA 2454615 A1 CA2454615 A1 CA 2454615A1
Authority
CA
Canada
Prior art keywords
implant
cortical
bore hole
bone tissue
screw
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.)
Granted
Application number
CA002454615A
Other languages
French (fr)
Other versions
CA2454615C (en
Inventor
Anders Holmen
Lars Rasmusson
Mats Wendel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Astra Tech AB
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Individual
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20285051&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2454615(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2454615A1 publication Critical patent/CA2454615A1/en
Application granted granted Critical
Publication of CA2454615C publication Critical patent/CA2454615C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • A61C8/0025—Self-screwing with multiple threads
    • 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

Abstract

The present invention relates to a screw implant (1) for insertion into a bore hole (50) arranged in bone tissue, said implant having a cancellous portion (3), and a cortical portion (2) having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52). Said cortical portion (2) presents an outer surface which is threaded for accomplishing said engagement, and has an outer design such that, when being screwed into said bore hole under action of a screwing torque, said cortical portion (2) acts so as to increase the compression of the cortical bone tissue only, in essentially radial directions of the implant, resulting is a distinct increase of the screwing torque needed for screwing the implant (1). Said increase is usable as an indication that the implant (1) is in place or nearly in place in the bore hole. The invention also relates to an arrangement comprising an implant and a bore hole, and a method for insertion of an implant into a bore hole.

Claims (47)

1. A screw implant (1) for insertion into a bore hole (50) arranged in bone tissue, said implant having a cancellous portion (3), and a cortical portion (2) having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52), said cortical portion (2) presenting an outer surface which is threaded for accomplishing said engagement, and having an outer design such that, when being screwed into said bore hole under action of a screwing torque, said cortical portion (2) acts so as to increase the compression of the cortical bone tissue only, in essen-tially radial directions of the implant, resulting in a distinct increase of the screwing torque needed for screwing the implant (1), which increase is usable as an indication that the implant (1) is in place or nearly in place in the bore hole.
2. A screw implant (1) for insertion into a bore hole (50) arranged in bone tissue, said implant having a cancellous portion (3) presenting an outer surface, and a cortical portion (2) having an axial length, such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be con-fined to the cortical bone tissue layer (52), said cortical portion (2) presenting a coni-cal outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (.alpha.) of less than 5° in relation to the outer surface of the cancellous portion (3).
3. A generally cylindrical screw implant (1) for insertion into a cylindrical bore hole (50) arranged in bone tissue, said implant (1) having a cancellous portion (3) present-ing a cylindrical outer surface, and a cortical portion (2), having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52), said cortical portion (2) presenting a conical outer surface being threaded for accom-plishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (a) of less than 5° in relation to the cylindrical outer surface of the cancellous portion (3).
4. A screw implant (1) for insertion into a bore hole (50) arranged in bone tissue, comprising a cancellous portion (3) having a lower cylindrical cancellous portion (3') and an upper conical cancellous portion (3 ") presenting a conical outer surface, wherein said implant (1) is provided with a cortical portion (2), having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52), said cortical portion (2) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (a) of less than 5° in relation to the outer surface of the upper, conical cancellous portion (3 ").
5. A screw implant (1) according to any of the preceding claims, wherein a maximum diameter of the implant (1) is located in the cortical portion (2).
6. A screw implant (1) according to any of the preceding claims, wherein the cortical portion (2) has the shape of a truncated regular cone.
7. A screw implant (1) according to any of the preceding claims, wherein said angle (a) is in the range 0.5 to 5°.
8. A screw implant (1) according to any of the preceding claims, wherein said angle (a) is less than less than 3°.
9. A screw implant (1) according to any of the preceding claims, wherein said angle (a) is in the range 0.5 to 3°.
10. A screw implant (1) according to any of the preceding claims, wherein said angle (a) is in the range 1 to 2°.
11. A screw implant (1) according to any of the preceding claims, wherein the axial length of the cortical portion (2) is equal to 3 mm.
12. A screw implant (1) according to any of claims 1 to 10, wherein the axial length of the cortical portion (2) is less than 3 mm.
13. A screw implant according to any of the claims 1 to 10, wherein the axial length of the cortical portion (2) is in the range 0.5 tol.5 mm.
14. A screw implant (1) according to any of the preceding claims, wherein said can-cellous portion (3) is provided with a threaded outer surface that merges with said threaded outer surface of the cortical portion (2), such that both threaded outer sur-faces are engagable in a common inner threaded surface of the bore hole.
15. A screw implant (1) according to claim 14, wherein both threaded outer surfaces present the same lead.
16. A screw implant (1) according to any of the preceding claims, wherein the im-plant (1) is provided with at least a first threading (11).
17. A screw implant (1) according to claim 16 in combination with claim 15 or 14, wherein both threaded surfaces are provided with said first threading (11).
18. A screw implant (1) according to claim 16 or 17, wherein the full axial length of the cortical portion (2) is provided with said first threading (11).
19. A screw implant (1) according to any of the claims 16 to 18, wherein said thread-ing (11) is a single threading.
20. A screw implant (1) according to any of the claims 16 to 18, wherein said thread-ing (11) is a multiple threading.
21. A screw implant (1) according to any of the claims 16 to 20, wherein said thread-ing (11) comprises a screw thread.
22. A screw implant (1) according to any of the claims 16 to 21, wherein said thread-ing (11) is defining a thread height being no greater than 0.20 mm.
23. A screw implant (1) according to any of the claims 16 to 22, wherein said thread-ing (11) is defining a thread height in the range 0.02 to 0.15 mm.
24. A screw implant (1) according to any of the claims 16 to 23, wherein said thread-ing (11) has a rounded outer design.
25. A screw implant (1) according to any of the claims 16 to 24, wherein said thread-ing (11) is symmetrical.
26. A screw implant (1) according to any of the claims 16 to 25, further being pro-vided with a second threading (12).
27. A screw implant (1) according to claim 26, wherein the first threading (11) and the second threading (12) merge with each other such that both threadings (11, 12) are engagable in a common inner thread.
28. A screw implant (1) according to claim 26 or 27, wherein said first and second threading (11, 12) are providing the same lead.
29. A screw implant (1) according to any of the claims 26 to 28, wherein a transversal border plane (P2) between the first and second threadings (11, 12) is provided below a transversal border plane (P1) between the cortical portion (2) and the cancellous portion (3).
30. A screw implant (1) according to any of the claims 26 to 28, wherein a transversal border plane (P2) between the first and second threadings (11, 12) is coinciding with transversal border plane (P1) between the cortical portion (2) and the cancellous por-tion (3).
31. A screw implant (1) according to any of the preceding claims, wherein the cortical portion (2) is adapted to hold a superstructure (20).
32. A screw implant (1) according to claim 31, wherein a blind bore (7) extends into the implant (1) from the uppermost end of the cortical portion (2) for holding a super-structure (20).
33. A screw implant (1) according to claim 32, said blind bore (7) being internally threaded.
34. A screw implant (1) according to any of the claims 1 to 30, wherein the implant (1) is formed integrally with a superstructure provided coronally of said cortical por-tion (2), said superstructure protruding from the bone tissue when the implant is in its implanted state.
35. A screw implant (1) according to any of the preceding claims, wherein the im-plant (1) is a dental implant.
36. A screw implant (1) according to any of the preceding claims, wherein said axial length of the cortical portion (2) is relatively short in relation to the axial length of said cancellous portion (3).
37. A screw implant (1) according to any of the preceding claims, wherein said corti-cal portion (2), when being screwed into said bore hole (50), acts so as to slightly compress cortical bone tissue in essentially radial directions of the cortical portion (2).
38. A method of installing an implant (1) according to any of the preceding claims in a bone, comprising the following steps:

- forming in said bone a bore hole (50) having a shape being adapted to the gen-eral shape of the implant (1) but being smaller in diameter, - screwing said implant (1) into the bore hole (50) by applying an insertion torque to the implant (1) until the cortical portion (2) of said implant (1) meets said bore hole resulting in a distinct rise in the screwing torque needed to turn the implant (1), which is an indication that the implant (1) is or is soon to be in place.
39. A method according to claim 38, wherein an outer part of said bore hole (50) is formed so as to correspond to the cancellous portion (3) of the implant (1).
40. A method according to any of the claims 38 and 39, wherein said bore hole (50) is cylindrical.
41. A method according to any of the claims 38 to 40, wherein said bore hole (50) is slightly smaller in diameter than the implant (1).
42. An arrangement for facilitating the insertion of a screw implant (1) in a bore hole (50) arranged in bone tissue, comprising a screw implant (1), having a cancellous portion (3), and a bore hole (50) having a shape generally corresponding to the outer shape of the implant (1), wherein said implant (1) is provided with a cortical portion (2) having an axial length such that, when installed in the bore hole (50), the engage-ment of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52), said cortical portion (2) presenting an outer surface, being threaded for accomplishing said engagement, and having an outer design such that when being screwed into said bore hole (50) under action of a screwing torque, said cortical portion (2) acts so as to increase the compression of cortical bone tissue in essentially radial directions of the implant (1), resulting in a distinct increase of the screwing torque needed for screwing the implant (1), which increase is usable as an indication that the implant (1) is in place or nearly in place in the bore hole (50).
43. An arrangement for facilitating the insertion of a screw implant (1) in a bore hole (50) arranged in bone tissue, comprising a screw implant (1), having a cancellous portion (3), and a bore hole (50) having a shape generally corresponding to a shape of the implant (1), wherein said implant (1) is provided with a cortical portion (2) having an axial length, such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the cortical bone tissue layer (52), said cortical portion (2) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms a non-zero angle (a) of less than 5°
in relation to the outer surface of the cancellous portion (3).
44. An arrangement for facilitating the insertion of a screw implant (1) in a bore hole (50) arranged in bone tissue, comprising a screw implant having a cancellous portion (3) presenting a cylindrical outer surface, and a bore hole (50) having a shape gener-ally corresponding to a shape of the implant, wherein said implant (1) is provided with a cortical portion (2), having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will gener-ally be confined to the cortical bone tissue layer (52), said cortical portion (2) present-ing a conical outer surface being threaded for accomplishing said engagement and which has a slight conical taper such that said conical outer surface forms an angle (a) of less than 5° in relation to the cylindrical outer surface of the cancellous portion (3).
45. An arrangement for facilitating the insertion of a screw implant (1) in a bore hole arranged in bone tissue, comprising a screw implant (1) having a lower cylindrical cancellous portion (3') and an upper conical cancellous portion (3) presenting a coni-cal outer surface and a bore hole (50) having a shape generally corresponding to a shape of the implant, wherein said implant (1) is provided with a cortical portion (2), having an axial length such that, when installed in the bore hole (50), the engagement of said cortical portion (2) with the bone tissue will generally be confined to the corti-cal bone tissue layer (52), said cortical portion (2) presenting a conical outer surface being threaded for accomplishing said engagement and which has a conical taper such that said conical outer surface forms an non-zero angle (a) of less than 5° in relation to the outer surface of the conical part of the cancellous portion (3).
46. An arrangement according to any of the claims 42 to 45, wherein said axial length of said cortical portion (2) is relatively short in relation to the axial length of said can-cellous portion (3).
47. A arrangement according to any of the claims 42 to 46, wherein said cortical por-tion (2), when being screwed into said bore hole (50), acts so as to slightly compress cortical bone tissue in essentially radial directions of the cortical portion (2).
CA2454615A 2001-08-15 2002-08-14 Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue Expired - Lifetime CA2454615C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0102749A SE0102749D0 (en) 2001-08-15 2001-08-15 Implant, arrangement including an implant, and method of inserting said implant into bone tissue
SE0102749-9 2001-08-15
PCT/SE2002/001458 WO2003015654A1 (en) 2001-08-15 2002-08-14 Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue

Publications (2)

Publication Number Publication Date
CA2454615A1 true CA2454615A1 (en) 2003-02-27
CA2454615C CA2454615C (en) 2010-10-26

Family

ID=20285051

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2454615A Expired - Lifetime CA2454615C (en) 2001-08-15 2002-08-14 Implant, arrangement comprising an implant, and method for inserting said implant in bone tissue

Country Status (13)

Country Link
US (1) US8029285B2 (en)
EP (1) EP1416872B2 (en)
JP (1) JP4282479B2 (en)
KR (1) KR100904471B1 (en)
CN (1) CN100421631C (en)
AT (1) ATE392861T1 (en)
AU (1) AU2002326257B2 (en)
BR (1) BR0211919B1 (en)
CA (1) CA2454615C (en)
DE (1) DE60226248T3 (en)
ES (1) ES2302833T5 (en)
SE (1) SE0102749D0 (en)
WO (1) WO2003015654A1 (en)

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