Bone marrow aspiration instrument

• US 20030233114A1
• Filed: 06/18/2002
• Published: 12/18/2003
• Est. Priority Date: 06/18/2002
• Status: Active Grant

• Current Assignee: Musculoskeletal Transplant Foundation
• Original Assignee: Musculoskeletal Transplant Foundation
• Inventors: Tanaka, Kazuna, Merboth, Barbara L., Naoi, Yukiko, Kapec, Jeffrey, Stephens, Adam
• Granted Patent: US 7,081,123 B2
• Time in Patent Office: Days
• US Class Current: 606/185
• CPC Class Codes: A61B 10/025 for taking bone, bone marrow or cartilage samples
• CPC Class Codes: A61B 2010/0258 Marrow samples
• CPC Class Codes: A61B 2090/062 penetration depth

Abstract

The cannula handle housing includes a recessed seat, wings extending outwardly from the recessed seat in the housing for engagement with a physician'"'"'s hand and a stem which extends from said housing to hold a portion of a cannula The cannula has a distal sharpened end and a proximal end secured to a Luer lock. The stylet includes a longitudinal member having a sharp tip with the other end of the stylet formed with an anvil structure which is molded into a stylet cap. The stylet cap is a housing which includes a projection portion having a complimentary configuration to the recessed seat formed in said cannula housing for interlocking with the Luer lock of the cannula housing. The stylet inserts into the cannula and with a twist, locks about the Luer lock on the proximal end of the cannula.

Claims

1. A bone marrow aspiration instrument comprising:

an elongated tubular cannula having an axially extending lumen therethrough and having distal and proximal ends;

a handle secured to the proximal end of said cannula, said handle being provided with wing portions extending outwardly from to the axis of said cannula and defining a cavity aligned with and open to the proximal end of said cannula, a stylet comprising an elongated shaft having a sharpened tip on one end and striking surface formed on its other end, a stylet handle secured to said stylet on its proximal end, said stylet handle being sized to fit in said cannula handle cavity, said elongated stylet shaft being slidably received within said cannula lumen, said stylet sharpened distal tip extending distally from the distal end of said cannula when said stylet is mounted in cannula lumen, locking means mounted in said cannula handle retaining said stylet in said cannula so that force may be applied to the striking surface of said elongated stylet positioned in said cavity without relative rotation between said elongated stylet and said elongated cannula.

2. A bone marrow aspiration instrument according to claim 1 wherein said cannula handle comprises two extending wing members, each of which has a lower curved section and an upper planar section.

3. A bone marrow aspiration instrument according to claim 1 wherein said stylet has a triangular planar surfaced tip.

4. A bone marrow aspiration instrument according to claim 1 wherein said stylet has a triangular concave surfaced tip.

5. A bone marrow aspiration instrument according to claim 1 wherein said cannula has scalloped sharpened end.

6. A bone marrow aspiration instrument according to claim 1 wherein said stylet comprises a solid metal shaft with a sharpened tip on one end and an anvil portion at its other end.

7. A bone marrow aspiration instrument according to claim 6 wherein said anvil portion is generally cylindrical with one end tapering to said shaft and the other end forming a planar striking surface.

8. A bone marrow aspiration instrument according to claim 1 wherein said stylet handle has a rounded projection which seats in a rounded cavity formed in said cannula handle in said body.

9. A bone marrow aspiration instrument according to claim 8 wherein a Luer lock is secured to said cannula handle communicating with said cannula lumen and extends upward into said cannula handle cavity.

10. A bone marrow aspiration instrument according to claim 1 wherein said cannula handle is eccentrically mounted to said cannula.

11. A bone marrow aspiration instrument according to claim 1 wherein said cannula handle comprises a body, a stem portion extending from said body and surrounding a portion of said cannula, said handle body having said wing portions extend away from a longitudinal axis of said cannula and define a curved recessed seat therein with adjacent planar surfaces.

12. A bone marrow aspiration instrument according to claim 1 wherein said handle body has a major portion located on one side of said cannula axis and a minor portion located on an opposite side of said cannula axis so that said handle body is eccentrically mounted on the axis of said cannula.

13. A bone marrow aspiration instrument according to claim 1 wherein said handle body has a substantially same shaped configuration located on opposite sides of an axis of said cannula.

14. A bone marrow aspiration instrument according to claim 1 wherein said cannula is axially aligned with a Luer lock secured to said handle body.

15. A bone marrow aspiration instrument for use in collecting bone marrow from preselected portions of a human bone comprising:

a. a cannula having a proximal end and a distal end with a lumen transversing said cannula from said proximal end to said distal end and a Luer lock mounted to said cannula,

b. a handle body eccentrically mounted to said cannula, said handle body defining gripping sections extending away from the axis of said cannula and a stem which extends away from said handle body along a portion of said cannula length, said handle body further defining a stylet seat;

c. a solid stylet having a proximal end forming a striking surface and a distal end forming a sharpened tip removably inserted within said lumen of said cannula;

d. a stylet handle secured to said stylet having a body with a configuration allowing it to fit in said cannula body stylet seat; and

,

e. means attached to said stylet handle body coupling said stylet handle body to said Luer lock.

16. A bone marrow aspiration instrument according to claim 15 wherein said cannula is coated with a surface lubricant coating.

17. A bone marrow aspiration instrument according to claim 16 wherein said lubricant coating comprising a group consisting of silicone, TEFLON and ground sapphire.

18. A bone marrow aspiration instrument according to claim 15 wherein said cannula surface is laser etched with bands to determine depth of penetration.

19. A bone marrow aspiration instrument according to claim 15 wherein said stylet comprises an elongated shaft, one end of said shaft being formed to have a sharpened tip, the other end of said shaft tapering to a cylindrical striking anvil with a planar end surface, said planar end surface extending beyond the surface of said stylet handle body to form an accessible striking surface.

20. A bone marrow aspiration instrument according to claim 15 wherein said cannula handle body defines an upper surface having a planar surface and a arcuate seat formed in said planar surface to receive and hold said stylet body configuration.

21. A bone marrow aspiration instrument according to claim 15 wherein said cannula and said stylet are constructed of stainless steel.

22. A bone marrow aspiration instrument for use in collecting bone marrow from preselected portions of a human bone comprising:

a. a cannula having a proximal end and a distal end with a lumen transversing said cannula from said proximal end to said distal end and a mounting member mounted to said cannula,

b. a handle body eccentrically mounted to said cannula, said handle body defining gripping sections extending away from the axis of said cannula and a stem which extends away from said handle body along a portion of said cannula length, said handle body further defining a stylet seat;

c. a solid stylet having a proximal end forming a striking surface and a distal end forming a sharpened tip removably inserted within said lumen of said cannula;

d. a stylet handle secured to said stylet having a body with a configuration allowing it to fit in said cannula body stylet seat; and

,

e. means attached to said stylet handle body coupling said stylet handle body to said mounting member.

23. A bone marrow aspiration instrument according to claim 22 wherein said gripping sections are wing members of different length.

24. A bone marrow aspiration instrument according to claim 22 wherein one of said wing members has an upper planar surface with locking means secured thereto to prevent rotational movement between said cannula handle and said stylet handle.

25. A bone marrow aspiration instrument according to claim 22 wherein said locking means is a detent adapted to receive a nipple on said stylet handle.

26. A bone marrow aspiration instrument according to claim 22 wherein said mating means is a Luer lock.

27. A bone marrow aspiration instrument according to claim 22 wherein said stylet handle defines a chamber configured to receive a Luer lock and is provided with locking rods.

28. A surgical instrument comprising:

a sectioned handle, one section of said handle having an upper curved surface having an off-center radius to conform to the shape of a user'"'"'s palm, said off-center radius being off-center with respect to a width of the handle, said handle section also having a lower surface defining a projection portion and planar surfaces;

a stylet extending through said handle from said upper surface through said projection portion;

a second handle section having extending wing portions, a stem and a recess to receive said first handle section projecting portion, a cannula mounted to said second handle section and connected to a Luer lock which extends into said second handle section recess.

29. A bone marrow collecting instrument, comprising:

a cannula handle, said handle defining a body with a curved lower surface having an off-center radius to conform to the shape of a user'"'"'s palm, said off-center radius being off-center with respect to a width of the handle, a stem portion which will surround a cannula and an upper surface defining a seat recess and at least one planar surface;

a cannula, said cannula having a first end mounted in said handle, a mating member secured to said cannula at its first end and a second end extending outwardly from said handle;

a removable stylet having first and second ends, said stylet extending through said cannula handle from through said cannula with one end having a handle secured thereto, said stylet handle having an upper surface having an off-center radius generally equal to said off-center radius of said cannula handle to allow said stylet handle to conform to said upper surface of said cannula handle, said stylet handle having a downward extending surface which mates with said seat recess of said cannula handle to allow at least a portion of said downward extending surface to be inserted into said cannula handle at said cannula handle seat recess.

30. A bone marrow collecting instrument, comprising:

a straight cannula of substantially uniform cylindrical configuration over the major portion of its length and having distal and proximal ends, the distal end being beveled;

a handle of generally T-shape having a proximal end defining a recessed seat with central hub portion and oppositely extending lateral wing portions and a distal end defining a stem;

the hub portion of said handle being formed about a portion of said cannula with a mating fitting, respectively, with the proximal end of said fitting being disposed completely with in the recess of said handle and not extending beyond proximal surfaces of the wing portions;

a removable stylet disposed in said cannula and removably secured said fitting;

said stylet including a straight solid needle with a beveled distal end and a knob handle secured to the other end, said knob handle being provided with mating means to engage said cannula handle fitting with a striking surface of said stylet extending beyond the proximal surface of said knob handle.

31. A bone marrow collecting instrument of claim 30 wherein said fitting is a Luer lock for releasable attachment to an aspiration syringe.

32. A bone marrow collecting instrument as recited in claim 30 wherein a chamber is formed in said stylet knob which include a locking means for locking said knob in said cannula handle when said knob is in a first position, and for unlocking said knob from said handle when said knob is axially rotated to allow said knob and stylet to be removed from said cannula handle.

33. A bone marrow collecting instrument according to claim 30 wherein said cannula is coated with a surface lubricant coating.

34. A bone marrow collecting instrument according to claim 33 wherein said lubricant coating comprises a group consisting of silicone, TEFLON and ground sapphire.

35. A bone marrow collecting instrument according to claim 30 wherein said cannula surface is laser etched with bands to determine depth of penetration.

36. A bone marrow collecting instrument according to claim 30 wherein said stylet comprises an elongated shaft, one end of said shaft being formed to have a sharpened tip, the other end of said shaft tapering to a cylindrical striking anvil with a planar end surface, said planar end surface extending beyond the surface of said stylet handle body to form an accessible striking surface.

37. A bone marrow collecting instrument according to claim 30 wherein said cannula handle body defines an upper surface having a curved surface and a arcuate seat formed in said planar surface to receive and hold said stylet body configuration.

38. A bone marrow collecting instrument according to claim 30 wherein said cannula and said stylet are constructed of stainless steel.

39. A bone marrow collecting instrument comprising:

a straight cannula of substantially uniform cylindrical configuration having distal and proximal ends, the distal end being provided with sharp edges and the proximal end of said cannula being mounted in a handle having a generally T-shape configuration with the stem of the T surrounding said cannula and the top of the T defining oppositely extending lateral wing portions and a recess between the wing portions, a central hub portion with a fitting mounted in said recess, the proximal end of said fitting being disposed below proximal surfaces of the wing portions;

a removable stylet disposed within said cannula and engaging said fitting in a locked position;

said stylet including a straight shaft of solid substantially uniform cylindrical configuration with a beveled distal end and a larger proximal end having a planar striking surface;

a knob member secured to the proximal end of the stylet needle, said knob member defining an interior chamber which fits over said fitting and a locking mechanism for engaging said cannula housing fitting, said stylet planar striking surface extending beyond a proximal surface of said knob member.