Surgery – Instruments – Cutting – puncturing or piercing
Patent
1990-01-16
1992-08-25
Bahr, Robert
Surgery
Instruments
Cutting, puncturing or piercing
606170, 606172, 604 36, 30162, 30335, 30342, A61B 1732
Patent
active
051415178
ABSTRACT:
A retractable surgical or other instrument is provided with a locking mechanism automatically actuated by sliding an operating element forward to extend it from a protective sheath. The locking mechanism operates by the cooperative action of a plurality of abutment means integrally molded into the interior of the instrument handle and a plurality of transverse bends forming a substantially closed loop profile in the proximal end of the elongated support shaft of the operating element. A longitudinally slidable actuating pin engages the proximal end of the support shaft to move it longitudinally in a selected direction. A portion of the proximal end of the shaft is biased to exert a radially outward force on the inner wall of the instrument handle thereby assuring positive engagement between the support shaft and an abutment surface which prevents rearward motion of the surgical element once it is placed in an extended position. Additional abutment surfaces are provided to enhance the locking effect and additional bends are provided in the proximal end of the support shaft to enable the slide switch to overcome the radially outward bias in order to retract the surgical element when desired.
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Bahr Robert
Doyle J.
Warzecha Gene
Zimmer Inc.
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