Claims
- 1. A biopsy device comprising:
a retractable stylet having a tip containing a plurality of blades and a central passage for receiving a localization needle; a cannula connected to a drive mechanism, said cannula having a shaft with a cutting ring opposite said drive mechanism and a plurality of disk blades mounted within said cannula; said drive mechanism for simultaneously rotating said cannula and moving said cannula in a direction parallel to a longitudinal axis of said cannula; a garrote with a first end, a second end, and a cutting surface for performing a cut transverse to said longitudinal axis of said cannula, said garrote mounted adjacent to said cutting ring of said cannula; a trigger for deploying said garrote, said trigger including a locking mechanism for preventing deployment of said garrote prior to movement of said cannula a predetermined distance; and a localization needle having a guide wire mounted within said needle.
- 2. The biopsy device as recited in claim 1, wherein said plurality of disk blades comprises at least two disk blades, a distal disk blade and a proximal disk blade, said proximal disk blade containing a notch for receiving said garrote wire as it exits said cannula to form said cutting surface.
- 3. The biopsy device as recited in claim 1, wherein said guide wire is movable within said localization needle.
- 4. The biopsy device as recited in claim 2, wherein said locking mechanism prevents deployment of said garrote until a cutting plane of said garrote is beyond an end of said guide wire.
- 5. The biopsy device as recited in claim 2, wherein said guide wire includes a barb for anchoring one end of said guide wire in a tissue sample.
- 6. The biopsy device as recited in claim 1, wherein said locking mechanism has a locked position and an unlocked position, in said locked position said trigger abuts a a plurality of ramps that are depressed by a lock depressor during advancement of said cannula.
- 7. The biopsy device as recited in claim 6, wherein when said locking mechanism is in said unlocked position, said trigger can be retracted to deploy said garrote.
- 8. The biopsy device as recited in claim 1, further comprising a spring mounted around said drive mechanism for applying resistance against said garrote wire.
- 9. A method of removing a tissue sample with a biopsy device, the method comprising the steps of:
a.) inserting a localization needle into a tissue sample; b.) advancing a barbed guide wire out of a distal end of the localization needle to anchor the biopsy device in the tissue; c.) advancing a stylet and a cannula having a cutting surface over the localization needle into the tissue; d.) advancing the cannula cutting surface to cut a core of tissue; e.) unlocking a trigger of a garrote wire when a cutting plane of the garrote wire has been advanced passed anend of the guide wire; and f.) moving the trigger to activate the garrote wire thereby pulling tissue against a plurality of disk blades located within the distal end of the cannula and making a cut transverse to a direction of advancement of the cannula.
- 10. The method of claim 9, wherein the cannula cutting surface is advanced by rotating rotation knob.
- 11. The method of claim 9, wherein the trigger is moved away from the cutting surface to activate the garrote wire.
- 12. A biopsy device for removing a tissue sample comprising:
a retractable stylet having a tip containing a plurality of blades and a central passage for receiving a localization needle; a cannula connected to a drive mechanism, said cannula having a shaft with a first and a second cam surface each supporting a cutting blade mechanism opposite said drive mechanism; said cutting blade mechanism comprising an outer blade connected to an inner blade by a first and a second pivot pin and a first and second actuation rod for pulling said inner and outer blades along said first and second cam surface, thereby closing said first blade against said second blade.
- 13. The biopsy device as recited in claim 12, wherein said inner and said outer blade are elliptical in shape.
- 14. The biopsy device as recited in claim 12, wherein said inner and said outer blade are semicircular in shape
- 15. A method of removing a tissue sample with a biopsy device, the method comprising the steps of:
a.) inserting a localization needle into tissue; b.) advancing a hooked guide wire out of a distal end of the localization needle to anchor the biopsy device in the tissue; c.) advancing a stylet and a cannula having a cutting surface over the localization needle into the tissue; d.) activating a trigger by pulling two activation rods toward the proximal end of the cannula thereby moving an inner blade and an outer blade each connected pivotally to the actuation rods against a cam surface and toward each other creating a shearing action between the blades for transecting the tissue;
- 16. The method of claim 15, further comprising the step of coring the tissue by pushing the inner and outer blades against the tissue prior to transecting the tissue by closing the blades.
- 17. A biopsy device comprising:
a retractable stylet having a housing containing a plurality of blades and a central passage for receiving a localization needle; said housing of said stylet having a circumference, a leading edge, and a center axis, said leading edge being a straight line at forty five degrees to said center axis; a cannula connected to a drive mechanism, said cannula having a shaft supporting a cutting ring opposite said drive mechanism and a plurality of disk blades mounted within said cannula; said drive mechanism for simultaneously rotating said cannula and moving said cannula in a direction that is parallel to a longitudinal axis of said cannula; a garrote wire with a first end, a second end, and a cutting surface for performing a cut transverse to said longitudinal axis of said cannula, said garrote wire mounted adjacent to said cutting ring of said cannula; a trigger for deploying said garrote wire, said trigger including a locking mechanism for preventing deployment of said garrote wire; and a localization needle having a guide wire mounted within said needle.
- 18. The biopsy device as recited in claim 17, wherein said housing of said stylet comprises two symmetrical conical shaped halves for dilation of tissue during use, said halves of said housing being integrally connected to each other.
- 19. The biopsy device as recited in claim 17, wherein said housing of said stylet is constructed of a plastic material.
- 20. The biopsy device as recited in claim 17, wherein said plurality of blades of said housing of said stylet comprises two symmetrical blades each with a leading edge, said blades seated in said housing with said leading edge of said blades exposed beyond said leading edge of said housing for transecting tissue.
- 21. The biopsy device as recited in claim 20, wherein said leading edge of said blades tapers in a curve from a maximum exposed portion at a distal end of said housing to a minimum exposed portion within said housing whereby said blades can transect a portion of tissue equal in width to said circumference of said housing.
- 22. A biopsy device comprising:
a retractable stylet having a tip containing a plurality of blades and a central passage for receiving a localization needle; a cannula mounted on a drive mechanism, said cannula having a shaft supporting a cutting ring opposite said drive mechanism and a plurality of disk blades mounted within said cannula; said drive mechanism for simultaneously rotating said cannula and moving said cannula in a direction that is parallel to a longitudinal axis of said cannula; a garrote wire with a first end, a second end, and a loop cutting surface for performing a cut transverse to said longitudinal axis of said cannula; an inner and an outer sleeve mounted around a shaft of said drive mechanism, said first end of said garrote wire attached to said inner sleeve and said second end of said garrote wire attached to said outer sleeve; a localization needle having a guide wire mounted within said needle.
- 23. The biopsy device as recited in claim 22, further comprising a trigger mechanism mounted adjacent said shaft of said drive mechanism for moving said inner and said outer sleeve.
- 24. The biopsy device as recited in claim 22, further comprising a shoulder in said shaft of said drive mechanism for preventing movement of said inner sleeve beyond a predetermined distance, whereby said inner and outer sleeves are initially moved simultaneously by pulling equally on said first and second ends of said garrote wire until said inner sleeve is stopped on said shoulder thereby ceasing movement of said first end of said garrote wire and continuing movement of said second end thereby increasing the force applied to said loop cutting surface for transecting the tissue.
- 25. A method of tissue removal with a biopsy device, the method comprising the steps of:
a.) inserting a localization needle into tissue; b.) advancing a hooked guide wire out of a distal end of the localization needle to anchor the biopsy device in the tissue; c.) advancing a stylet and a cannula over the localization needle into the tissue; d.) activating a trigger to pull an inner and an outer sleeve connected to the ends of a garrote wire thereby pulling a loop of the garrote wire around the tissue for transection; e.) continuing activation of the trigger after the inner sleeve ceases movement thereby continuing to pull only the outer sleeve and one of the ends of the garrote wire to increase the force on the loop of the garrote wire transecting the tissue.
- 26. A biopsy device comprising:
a retractable stylet having a tip containing a plurality of blades and a central passage for receiving a localization needle; a cannula mounted on a drive mechanism, said cannula having a shaft supporting a cutting ring opposite said drive mechanism and a plurality of disk blades mounted within said cannula for cutting suspect breast tissue; said drive mechanism for simultaneously rotating said cannula and moving said cannula in a direction that is parallel to a longitudinal axis of said cannula; a garrote wire with a first end, a second end, and a loop cutting surface for performing a cut transverse to the longitudinal axis of the cannula; a first and second sleeve mounted around a shaft of said drive mechanism, said first end of said garrote wire attached to said first sleeve and said second end of said garrote wire attached to said second sleeve; a spring with a first end and a second end mounted around said shaft of said drive mechanism, said first end of said spring connected to said first sleeve and said second end of said spring connected to said second sleeve, said spring applying a force to said first and second ends of said garrote wire; and a localization needle having a guide wire mounted within said needle.
Priority Claims (1)
Number |
Date |
Country |
Kind |
PCT/US98/18172 |
Sep 1998 |
US |
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Parent Case Info
[0001] This application is a Continuation in Part Application of 09/542,623 filed Apr. 4, 2000 which was a Continuation Application of 09/151,439 filed Sep. 11, 1998 U.S. Pat. No. 6,080,113 which claims benefit of 60,058,691 filed Sep. 12, 1997.
Provisional Applications (1)
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Number |
Date |
Country |
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60058691 |
Sep 1997 |
US |
Continuations (1)
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Number |
Date |
Country |
Parent |
09151439 |
Sep 1998 |
US |
Child |
09542623 |
Apr 2000 |
US |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
09692928 |
Oct 2000 |
US |
Child |
09776444 |
Feb 2001 |
US |
Parent |
09542623 |
Apr 2000 |
US |
Child |
09692928 |
Oct 2000 |
US |