CPC A61B 17/32002 (2013.01) [A61B 50/13 (2016.02); A61B 2017/00017 (2013.01); A61B 2017/00075 (2013.01); A61B 2017/320028 (2013.01); A61B 2217/007 (2013.01)] | 12 Claims |
1. A tissue resecting device, comprising:
an assembly of tubular first and second members, the second member having a resecting element at a distal end thereof;
a handle;
a motor drive system carried in the handle and a controller configured for moving the second member across a window of the first member;
the motor drive system including a motor and a motor shaft driving a rotation-to-linear motion conversion mechanism, wherein a distal edge of the second member moves back and forth across the window of the first member from a window open position to a window closed position;
wherein the controller includes an algorithm configured to stop reciprocation of the second member with the distal edge of the second member at a stop position in which the tissue-receiving window is partially open;
wherein the rotation-to-linear motion conversion mechanism includes a rotatable drive collar; and
a microswitch, wherein the microswitch engages an engagement feature of the drive collar once each revolution of the drive collar;
wherein the microswitch sends an electrical signal to the controller for each instance the microswitch engages the engagement feature;
wherein the controller is configured to de-energize the motor at a point Y between a reference point in which the microswitch engages the engagement feature and the stop position.
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