IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0146925
(2010-02-09)
|
등록번호 |
US-9011505
(2015-04-21)
|
우선권정보 |
FR-09 00557 (2009-02-09) |
국제출원번호 |
PCT/FR2010/000094
(2010-02-09)
|
§371/§102 date |
20110906
(20110906)
|
국제공개번호 |
WO2010/089481
(2010-08-12)
|
발명자
/ 주소 |
- Prandi, Bernard
- Lariviere, Jean
- R'Taimate, Mohammed
|
출원인 / 주소 |
|
대리인 / 주소 |
Lerner, David, Littenberg, Krumholz & Mentlik, LLP
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
64 |
초록
▼
The invention relates to a self-tapping and self-boring osteosynthesis screw for compressive orthopaedic surgery, characterised in that, in the bone engagement regions, at both the distal portion (A1a) and at the proximal portion (A2a), the sum of the angles defining the outer taper of the shank (f)
The invention relates to a self-tapping and self-boring osteosynthesis screw for compressive orthopaedic surgery, characterised in that, in the bone engagement regions, at both the distal portion (A1a) and at the proximal portion (A2a), the sum of the angles defining the outer taper of the shank (f) and the taper of the crest line of the screw thread pitch (P) is higher than 45°, and in that the leading portion (i.e. the most distal one) of each thread includes a plurality of cutting edges (AR) obtained by stock removal.
대표청구항
▼
1. An osteosynthesis and arthrodesis screw for fusing two bone parts comprising: a distal portion having an external diameter and a screw pitch defined by distal threads thereon;a proximal portion having an external diameter and a screw pitch defined by proximal threads thereon;a barrel extending th
1. An osteosynthesis and arthrodesis screw for fusing two bone parts comprising: a distal portion having an external diameter and a screw pitch defined by distal threads thereon;a proximal portion having an external diameter and a screw pitch defined by proximal threads thereon;a barrel extending through and forming part of the distal and proximal portions, the barrel including an unthreaded portion between the distal and proximal portions, a first conical end forming roots of the distal threads of the distal portion, and a second conical end forming part of the proximal portion; anda central axis passing through the barrel including through the distal and proximal portions,wherein the roots of the distal threads of the distal portion define a line,wherein the central axis of the screw and the line defined by the roots of the distal threads of the distal portion define an angle al, and the central axis of the screw and a crest line of the distal threads form an angle b1, andwherein the sum of the angles a1+b1 is greater than 45°. 2. The screw as claimed in claim 1, wherein the central axis of the screw and a line defined by roots of the proximal threads of the proximal portion define an angle a2, wherein the central axis of the screw and a crest line of the proximal threads form an angle b2, and wherein the sum of the angles a1+b1 is between 50° and 70° and the sum of the angles a2+b2 is between 50° and 70°. 3. The screw as claimed in claim 2, wherein the angle a1 is between 4° and 10° and the angle a2 is between 10° and 20°. 4. The screw as claimed in claim 1, wherein the screw has a flat head. 5. The screw as claimed in claim 1, wherein the proximal portion has a conical, self-tapping bone-attack zone. 6. The screw as claimed in claim 1, wherein a distal attack portion of each of the proximal and distal threads comprises a plurality of cutting ridges obtained by removal of material on the respective threads. 7. The screw as claimed in claim 6, wherein the cutting ridges are offset negatively relative to a radial axis of the screw such that the ridges are rearward relative to the direction of rotation of the screw when screwing in the screw. 8. The screw as claimed in claim 6, wherein the cutting ridges are offset rearward in order to present a bone attack angle when screwing in of between 5° and 12°. 9. The screw as claimed in claim 6, wherein a depth of the cutting ridges is less than or equal to a depth of the respective thread on which each cutting ridge is formed. 10. The screw as claimed in claim 6, wherein a depth of the cutting ridges is equal to the depth of the thread. 11. The screw as claimed in claim 6, wherein the cutting ridges have a relief of 10° rearward in the direction of screwing in. 12. An osteosynthesis and arthrodesis screw for fusing two bone parts comprising: a distal portion having an external diameter and a screw pitch defined by distal threads thereon;a proximal portion having an external diameter and a screw pitch defined by proximal threads thereon;a barrel extending through and forming part of the distal and proximal portions, the barrel including an unthreaded portion between the distal and proximal portions, a first conical end forming part of the distal portion, and a second conical end forming part of the proximal portion; anda central axis passing through the barrel including through the distal and proximal portions,wherein the central axis of the screw and a crest line of the distal threads form an angle b1, andwherein b1 is between 50° and 80°. 13. The screw as claimed in claim 12, wherein a distal attack portion of each of the proximal and distal threads comprises a plurality of cutting ridges obtained by removal of material on the respective threads. 14. The screw as claimed in claim 13, wherein the cutting ridges are offset negatively relative to a radial axis of the screw such that the ridges are rearward relative to the direction of rotation of the screw when screwing in the screw. 15. The screw as claimed in claim 13, wherein the cutting ridges are offset rearward in order to present a bone attack angle when screwing in of between 5° and 12°. 16. The screw as claimed in claim 13, wherein a depth of the cutting ridges is less than or equal to a depth of the respective thread on which each cutting ridge is formed. 17. The screw as claimed in claim 13, wherein a depth of the cutting ridges is equal to the depth of the thread. 18. The screw as claimed in claim 13, wherein the central axis of the screw and a line defined by roots of the proximal and distal threads of the distal portion define an angle a1, and wherein the angle a1 is between 4° and 10° and the angle a2 is between 10° and 20°. 19. The screw as claimed in claim 13, wherein the cutting ridges have a relief of 10° rearward in the direction of screwing in. 20. The screw as claimed in claim 13, wherein the proximal portion has a conical, self-tapping bone-attack zone.
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