Pneumatically actuated tissue sampling device

• US 6,273,861 B1
• Filed: 09/01/1998
• Issued: 08/14/2001
• Est. Priority Date: 01/30/1997
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Haaga, John, Hawkins, Harold G., Bates, James S., Nishtala, Srinivas, Hoffman, Keith E.
• Primary Examiner(s): Seidel, Richard K.
• Assistant Examiner(s): MAYNARD, JENNIFER J
• Application Number:
  US09/145,201
• Time in Patent Office: 1,078 Days
• Field of Search: 604/164-170, 604/256, 604/263, 604/264, 604/272, 604/274, 604/117, 604/507, 604/164.12, 604/156, 606/167, 606/170, 606/184, 606/185, 600/562, 600/564, 600/565-567
• US Class Current: 600/567
• CPC Class Codes: A61B 10/0275 with sample notch, e.g. on the side of inner stylet
• CPC Class Codes: A61B 2010/0208 Biopsy devices with actuators, e.g. with triggered spring mechanisms
• CPC Class Codes: A61B 2017/00544 pneumatically
• CPC Class Codes: A61B 2017/00973 pedal-operated

Abstract

A novel instrument for automatic sampling or removal of tissue percutaneously from a patient. In a disclosed embodiment the instrument comprises a housing, a means for excising tissue from a target site within a patient'"'"'s body extending from the housing, a means for impelling the excising means into a target tissue site in response to an impelling force, and a rotatable handle.

Claims

1. A tissue removing device comprising:

head portion;

a cannula extending from said head portion, said cannula having a proximal end and a distal end;

a stylet extending from said head portion, said stylet having a proximal end and a distal end, wherein

said cannula and said stylet are co-axial with said head portion;

and said cannula is coaxially disposed about said stylet,

said stylet is mounted within said head portion for axial movement relative to said head portion and relative to said cannula between a first, retracted position and a second, extended position; and

said cannula is mounted within said head portion for axial movement relative to said head portion and relative to said stylet between a first, retracted position and a second, extended position;

a handle rotatably attached to said head portion, said handle containing a compressed fluid passage;

means for impelling said stylet toward said second, extended position in response to an impelling force; and

means for impelling said cannula toward said second, extended position in response to an impelling force, wherein said means for impelling said stylet and said means for impelling said cannula are in fluid communication with a single source of compressed fluid, and wherein fluid from said source of compressed fluid provides the impelling force.

2. The tissue removing device of claim 1, wherein said handle is rotatable over at least about 180 degrees.

3. The tissue removing device of claim 2, wherein said handle is rotatable over about 360 degrees.

4. The tissue removing device of claim 1, wherein said handle is removably attached to said head portion.

5. The tissue removing device of claim 4, wherein

said handle includes a pin hinge;

said head portion includes a receiving portion having a mating configuration to said pin hinge; and

said handle is attached to said head portion by placing said pin hinge into said head portion.

6. The tissue removing device of claim 5, further comprising an o-ring between said handle and said head portion when said handle is attached to said head portion.

7. The tissue removing device of claim 1, wherein said stylet comprises a circumferential notch near its distal end.

8. The tissue removing device of claim 1, wherein said handle includes a housing for receiving said source of compressed fluid.

9. The tissue removing device of claim 8, further comprising a firing trigger on said handle that releases the fluid from said source of compressed fluid.

10. The tissue removing device of claim 9, wherein said head portion includes a channel to allow the fluid from said source of compressed to pass into said head portion.

11. The tissue removing device of claim 1, wherein said compressed fluid is carbon dioxide gas.

12. The tissue removing device of claim 1, wherein said compressed fluid is an inert gas.

13. The tissue removing device of claim 1, wherein said means for impelling said stylet comprises:

a stylet shaft connected to the proximal end of said stylet, wherein at least a portion of said stylet shaft is disposed within said head portion;

a stylet shaft collar mounted on the portion of said stylet shaft disposed within said head portion.

14. The tissue removing device of claim 13, wherein

said head portion comprises a first cavity and a second cavity in sequence along the longitudinal axis of said head portion, wherein the inner diameter of said first cavity is approximately equal to the outer diameter of said stylet shaft collar, and wherein the inner diameter of said second cavity is greater than the outer diameter of said stylet shaft collar.

15. The tissue removing device of claim 14, wherein at least one surface of said stylet shaft collar is beveled.

16. The tissue removing device of claim 14, further comprising an o-ring disposed circumferentially around the outer walls of said stylet shaft collar.

17. The tissue removing device of claim 1, wherein said means for impelling said cannula comprises:

a cannula shaft connected to the proximal end of said cannula, said cannula shaft being extendable from said head portion;

a cannula shaft collar mounted on a portion of said cannula shaft disposed within said head portion.

18. The tissue removing device of claim 17, further comprising an o-ring disposed circumferentially around the outer walls of said cannula shaft collar.

19. A tissue removing device comprising:

a head portion;

a cannula extending from said head portion, said cannula having a proximal end and a distal end;

a stylet extending from said head portion, said stylet having a proximal end and a distal end, wherein

said cannula and said stylet are co-axial with said head portion;

said cannula is coaxially disposed about said stylet,

said stylet is mounted within said head portion for axial movement relative to said head portion and relative to said cannula between a first, retracted position and a second, extended position; and

said cannula is mounted within said head portion for axial movement relative to said head portion and relative to said stylet between a first, retracted position and a second, extended position;

a handle removeably coupled to said head portion, said handle containing a compressed fluid passage; and

a single source of compressed fluid, wherein fluid from said source of compressed fluid provides an impelling force for impelling said stylet toward said second, extended position and for impelling said cannula toward said second, extended position.

20. The tissue removing device of claim 19, wherein said handle is rotatable over at least about 180 degrees.

21. The tissue removing device of claim 19, wherein said handle is removably attached to said head portion.

22. A tissue removing device comprising:

a housing defining a compressed fluid cavity;

a cannula protruding from said housing, said cannula having a proximate end and a distal end;

a stylet protruding from said housing, said stylet having a proximate end and a distal end;

wherein

said stylet is mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position; and

said cannula is mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position;

means for impelling said stylet toward said second, extended position in response to an impelling force;

means for impelling said cannula toward said second, extended position in response to an impelling force; and

said means for impelling said stylet and said means for impelling said cannula are in fluid communication with a single source of compressed fluid, and wherein fluid from said source of compressed fluid provides the impelling force.

23. The tissue removing device of claim 22, wherein said compressed fluid is carbon dioxide gas.

24. The tissue removing device of claim 22, wherein said compressed fluid is an inert gas.

25. The tissue removing device of claim 22, further comprising a firing trigger for releasing the fluid from said source of compressed fluid into said housing.

26. The tissue removing device of claim 25, wherein the firing trigger is positioned on a surface of said housing.

27. The tissue removing device of claim 25, wherein the firing trigger is remote from said housing.

28. The tissue removing device of claim 22, wherein the impelling force is between approximately 5 and 25 pounds.

29. The tissue removing device of claim 22, wherein said stylet comprises a circumferential notch near its distal end.

30. The tissue removing device of claim 22, further comprising:

a first finger-displaceable member for retracting said stylet from said second, extended position to said first, retracted position; and

a second finger-displaceable member for retracting said cannula from said second, extended position to said first, retracted position.

31. The tissue removing device of claim 22, wherein said means for impelling said stylet comprises:

a stylet shaft connected to the proximate end of said stylet, wherein at least a portion of said stylet shaft is disposed within said housing;

a stylet shaft collar mounted on the portion of said stylet shaft disposed within said housing.

32. The tissue removing device of claim 31, wherein

said housing comprises a first cavity and a second cavity in sequence along the longitudinal axis of said housing, wherein the inner diameter of said first cavity is approximately equal to the outer diameter of said stylet shaft collar, and wherein the inner diameter of said second cavity is greater than the outer diameter of said stylet shaft collar.

33. The tissue removing device of claim 32, wherein at least one surface of said stylet shaft collar is beveled.

34. The tissue removing device of claim 32, further comprising an o-ring disposed circumferentially around the outer walls of said stylet shaft collar.

35. The tissue removing device of claim 22, wherein said means for impelling said cannula comprises:

a cannula shaft connected to the proximate end of said cannula, said cannula shaft being extendable from said housing;

a cannula shaft collar mounted on a portion of said cannula shaft disposed within said housing.

36. The tissue removing device of claim 35, further comprising an o-ring disposed circumferentially around the outer walls of said cannula shaft collar.

37. A tissue removing device comprising:

a head portion;

a cannula extending from said head portion, said cannula having a proximal end and a distal end;

a stylet extending from said head portion, said stylet having a proximal end and a distal end, wherein

said cannula and said stylet are co-axial with said head portion;

said cannula is coaxially disposed about said stylet,

said stylet is mounted within said head portion for axial movement relative to said head portion and relative to said cannula between a first, retracted position and a second, extended position; and

said cannula is mounted within said head portion for axial movement relative to said head portion and relative to said stylet between a first, retracted position and a second, extended position;

a handle rotatably attached to said head portion;

means for impelling said stylet toward said second, extended position in response to an impelling force; and

means for impelling said cannula toward said second, extended position in response to an impelling force.

38. A tissue removing device comprising:

a housing defining a compressed fluid cavity;

a cannula protruding from said housing, said cannula having a proximate end and a distal end;

a stylet protruding from said housing, said stylet having a proximate end and a distal end, wherein said cannula is coaxially disposed about said stylet;

wherein

said stylet is mounted for axial movement relative to said housing and relative to said cannula between a first, retracted position and a second, extended position; and

said cannula is mounted for axial movement relative to said housing and relative to said stylet between a first, retracted position and a second, extended position; and

a single source of compressed fluid, wherein said compressed fluid provides an impelling force for impelling said stylet and said cannula toward their respective said second, extended positions.

39. The tissue removing device of claim 38, wherein said compressed fluid is an inert gas.

40. The tissue removing device of claim 38, wherein the impelling force is between approximately 5 and 25 pounds.

41. A tissue removing device comprising:

a housing defining a compressed fluid cavity;

a cannula protruding from said housing, said cannula having a proximate end and a distal end, said cannula supported by said housing and adapted to move between a first position and a second position, said cannula in fluid communication with said compressed fluid cavity;

a stylet located within said cannula, said stylet having a proximate end and a distal end, said stylet supported by said housing within said cannula, said stylet adapted to move between a retracted position and an extended position, said stylet in fluid communication with said compressed fluid cavity; and

a source of compressed fluid in communication with said compressed fluid cavity.

42. The tissue removing device of claim 41 wherein said source of compressed fluid is removably coupled to said housing.

43. The tissue removing device of claim 41 wherein said stylet and said cannula move axially along the axial centerline of said housing.