A discontinuously double-threaded bone screw includes a drive head and anchoring body consisting of a cylindro-conical core over which extend at least two cylindro-conical threads, the anchoring body including anchoring portions of different profiles, ensuring an anchoring corresponding to different
A discontinuously double-threaded bone screw includes a drive head and anchoring body consisting of a cylindro-conical core over which extend at least two cylindro-conical threads, the anchoring body including anchoring portions of different profiles, ensuring an anchoring corresponding to different bone hardnesses and strengths, the anchoring body including, below the drive head, a first anchoring portion with a conical core and two threads with cylindrical profile and identical pitch, a second anchoring portion with a cylindrical core and a single cylindrical thread over ¼ turn, a third anchoring portion with a cylindrical core and two threads with cylindrical profile over ½ turn, a fourth anchoring portion including a cylindrical core and a single thread with cylindrical profile n turn based on total length of the bone screw, and a fifth anchoring portion including a conical core and two threads with conical profile forming the tip of the bone screw.
대표청구항▼
1. A discontinuously double-threaded bone screw (1) for attachment of a prosthesis or an implant against a bone portion, comprising: a drive head (2); andan anchoring body (3) extending from the drive head (2),the anchoring body including a cylindro-conical core (4), over which extends at least two
1. A discontinuously double-threaded bone screw (1) for attachment of a prosthesis or an implant against a bone portion, comprising: a drive head (2); andan anchoring body (3) extending from the drive head (2),the anchoring body including a cylindro-conical core (4), over which extends at least two cylindro-conical threads (5, 6) to ensure an anchoring of the bone screw (1) to a bone,the anchoring body (3) also including, over an entire length of the anchoring body and starting from a location of the drive head (2), anchoring portions of different profiles to ensure an anchoring of the bone screw corresponding to different hardnesses and strengths of the bone,the anchoring portions of the anchoring body (3) including, below the drive head (2), a first anchoring portion (7) having a conical core (4a) and two threads (5, 6) with a cylindrical profile of identical pitch,a second anchoring portion (8) having a cylindrical core (4b) and a single cylindrical thread (5) over a ¼ turn,a third anchoring portion (9) having a cylindrical core (4b) and two threads (5, 6) with a cylindrical profile over a 1/2 turn,a fourth anchoring portion (10) having a cylindrical core (4b) and a single thread (6) with cylindrical profile over n turn as a function of a total length of the bone screw (1), anda fifth anchoring portion (11) having a conical core (4a) and two threads (5, 6) with conical profile forming a tip of said bone screw. 2. The discontinuously double-threaded bone screw according to claim 1, wherein the first anchoring portion (7) includes two threads (5, 6) with a cylindrical profile of identical pitch offset on a periphery of the conical core (4a) by 180°. 3. The discontinuously double-threaded bone screw according to claim 1, wherein the fourth anchoring portion (10) includes a cylindrical thread (6) that is different from the cylindrical thread (5) of the second anchoring portion (8). 4. The discontinuously double-threaded bone screw according to claim 1, further comprising: an internal bore (13). 5. The discontinuously double-threaded bone screw according to claim 1, wherein the drive head (2) has a head with a spherical profile (2a), and an internal portion with a recess (2b) for placement of a tool. 6. The discontinuously double-threaded bone screw according to claim 1, wherein the drive head (2) has a single-piece head (20) with a U-shaped profile configured to receive a tightening screw for immobilization of an osteosynthesis device. 7. The discontinuously double-threaded bone screw according to claim 1, wherein the two threads of the fifth anchoring portion (11) are self-tapping threads.
Dewey, Jonathan; Patterson, Chris, Bone anchors having two or more portions exhibiting different performance characteristics and method of forming the same.
Denis, Francis; Garvey, Timothy A.; Perra, Joseph H.; Pinto, Manuel; Schwender, James D.; Transfeldt, Ensor; Veldman, Michael S.; Rezach, William A., Multi-thread bone screw and method.
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