A surgical rasping system functional in multiple orthopedic applications, including but not limited to shoulder, knee, hip, wrist, ankle, spinal, or other joint procedures. The system may comprise a tissue removal member with a rasping head which may be low profile and offer a flat cutting/rasping s
A surgical rasping system functional in multiple orthopedic applications, including but not limited to shoulder, knee, hip, wrist, ankle, spinal, or other joint procedures. The system may comprise a tissue removal member with a rasping head which may be low profile and offer a flat cutting/rasping surface, or with a cutting head with at least one cutting edge. The tissue removal member is configured to be driven by an attached hub that translates a rotational movement into a reciprocating motion. Suction for removal of bone fragments or other tissues is provided through an opening spaced apart from or adjacent to the rasping surface. A radiofrequency ablation (RF) electrode may be carried on the rasping system to provide ablation or coagulation of soft tissues.
대표청구항▼
1. A system for tissue removal, the system comprising: a rotatable member adapted to be rotated about a rotation axis by a powered rotary handpiece;a tissue removal member comprising a shaft extending longitudinally between a proximal end and a distal end, the shaft coupled to the rotatable member,
1. A system for tissue removal, the system comprising: a rotatable member adapted to be rotated about a rotation axis by a powered rotary handpiece;a tissue removal member comprising a shaft extending longitudinally between a proximal end and a distal end, the shaft coupled to the rotatable member, a cutting head formed on the distal end of the shaft, at least one cutting edge formed on the cutting head; anda motion conversion mechanism, the motion conversion mechanism comprising the rotatable member, a first cam member comprising an annular first cam surface, a second cam member, and a spherical bearing member separate from the first and second cam members and positioned between the first and second cam members, the second cam member joined to the rotatable member;wherein the first cam member comprises a plurality of high points defined by the annular first cam surface, wherein the plurality of high points comprise at least one recessed dimple at least partially receiving the spherical bearing member, wherein during rotation of the rotatable member about the rotation axis, the second cam member rotates relative to the first cam member, and the motion conversion mechanism urges reciprocal translation of the tissue removal member along the rotation axis, wherein the cutting head is translated between a first retracted position and a second extended position. 2. The system of claim 1, wherein during rotation of the rotatable member about the rotation axis, the first cam member is stationary and the second cam member rotates relative to the first cam member about the rotation axis. 3. The system of claim 2, wherein the second cam member comprises an annular second cam surface shaped complementarily to the first cam surface. 4. The system of claim 3, wherein the spherical bearing is continually in direct contact with the first and second cam surfaces. 5. The system of claim 3, wherein the second cam surface comprises a grooved track. 6. The system of claim 3, wherein the at least one recessed dimple is recessed into the first cam surface, wherein the at least one recessed dimple retains the spherical bearing during rotation of the second cam member relative to the first cam member. 7. The system of claim 3, wherein the at least one recessed dimple comprises a plurality of recessed dimples recessed into the first cam surface, and wherein the motion conversion mechanism comprises a plurality of spherical bearings wherein the plurality of recessed dimples at least partially receive, individually, the plurality of spherical bearings. 8. The system of claim 1, further comprising a suction pathway extending through the tissue removal member and the first and second cam members, wherein the system is adapted to provide suction force proximally through the suction pathway. 9. The system of claim 8, wherein the suction pathway is coaxial with the rotation axis. 10. The system of claim 8, wherein the tissue removal member comprises an opening to the suction pathway, wherein the opening is proximal to the cutting feature. 11. The system of claim 1, wherein the shaft extends longitudinally through the first and second cam members. 12. The system of claim 11, wherein the tissue removal member is slidably coupled to the first cam member, allowing the tissue removal member to linearly reciprocate relative to the first cam member during rotation of the rotatable member about the axis. 13. The system of claim 11, wherein the tissue removal member is rotatably coupled to the second cam member, allowing the second cam member to rotate about the tissue removal member during rotation of the rotatable member about the axis. 14. The system of claim 1, wherein the cutting head is biased toward the extended position. 15. The system of claim 1, further comprising an outer housing which encloses the first cam member and the second cam member, wherein the first cam member is rigidly connected to the outer housing and the second cam member is rotatable relative to the outer housing. 16. The system of claim 1, further comprising a retention member which retains the shaft in a fixed longitudinal position relative to the second cam member. 17. A motion conversion mechanism for conversion of rotary motion provided by a powered rotary handpiece into reciprocal motion, the motion conversion mechanism extending along a rotation axis, the motion conversion mechanism comprising: a rotatable member adapted to engage a rotary driver on a powered rotary handpiece to rotate the rotatable member about the rotation axis;a first cam member having a first cam surface, wherein the first cam surface comprises a plurality of high points defined by the first cam surface, wherein the plurality of high points comprise at least one recessed dimple;a second cam member having a second cam surface complementarily shaped to the first cam surface, the second cam member joined to the rotatable member;at least one spherical bearing member separate from the first and second cam members and positioned between the first and second cam surfaces and at least partially positioned within the at least one recessed dimple; anda shaft coaxial with the rotation axis, the shaft having a proximal end and a distal end, the shaft proximal end slidably coupled to the second cam member, wherein upon rotation of the rotatable member, the second cam member rotates about the rotation axis and the shaft reciprocally translates along the rotation axis. 18. The motion conversion mechanism of claim 17, wherein the shaft extends through the first cam member, the first cam member positioned distal to the second cam member along the rotation axis. 19. The motion conversion mechanism of claim 18, wherein the shaft extends through the second cam member, the second cam member distal to the rotatable member. 20. The motion conversion mechanism of claim 19, wherein the second cam member is partially received in the rotatable member. 21. The motion conversion mechanism of claim 17, wherein upon rotation of the rotatable member, the first cam member remains stationary relative to the rotation axis and the second cam member rotates about the rotation axis. 22. The motion conversion mechanism of claim 21, wherein upon rotation of the rotatable member, the second cam member rotates with the rotatable member and simultaneously reciprocates relative to the rotatable member. 23. The motion conversion mechanism of claim 17, wherein the shaft reciprocates between a proximal retracted position and a distal extended position. 24. The motion conversion mechanism of claim 17, wherein the shaft is biased toward the distal extended position. 25. The motion conversion mechanism of claim 17, further comprising an outer housing which encloses the first cam member and the second cam member, wherein the first cam member is rigidly connected to the outer housing and the second cam member is rotatable relative to the outer housing. 26. The motion conversion mechanism of claim 17, further comprising a retention member which retains the shaft in a fixed longitudinal position relative to the second cam member. 27. The system of claim 17, wherein the at least one recessed dimple comprises a plurality of recessed dimples, and wherein the at least one spherical bearing member comprises a plurality of spherical bearings wherein the plurality of recessed dimples at least partially receive, individually, the plurality of spherical bearings.
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