Reciprocating surgical instrument
First Claim
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; and
a 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.
5 Assignments
0 Petitions
Accused Products
Abstract
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.
92 Citations
27 Claims
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1. A system for tissue removal, the system comprising:
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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; and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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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:
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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; and a 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. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification