Patent ID: 6245084
Filing Date: 2001-06-12
Classification: A61B

Abstract:
A tissue cutting apparatus comprising:an elongated housing configured for insertion into a body site, said housing having a first end defining an opening adjacent thereto;a tissue cutting tool disposed within said housing and defining at least one cutting surface configured for movement relative to said housing adjacent said opening to thereby excise tissue extending into said opening;a motor driving a drive shaft extending therefrom and coupled to said cutting tool, said motor operable to drive said cutting tool at a cutting speed to excise tissue at said opening;means for sensing a predefined position of said drive shaft relative to said housing and producing a stop position signal corresponding thereto, said predefined position corresponding to a position of said at least one cutting surface relative to said opening to avoid trapping unexcised tissue therebetween;means for generating a motor stop signal when it is desired to stop said cutting tool; anda control circuit responsive to said motor stop signal to deactivate said motor with said drive shaft at a position prior to said predefined position so that said motor stops with said drive shaft substantially at said predefined position.