Surgical instrument having a handle with a removable, rotatable tip

• US 5,893,873 A
• Filed: 10/22/1996
• Issued: 04/13/1999
• Est. Priority Date: 10/23/1995
• Status: Expired due to Term

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Awh, Carl C., deJuan, Eugene Jr., Walsh, Alexander C., Rader, R. Scott
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Trinh, Vikki
• Application Number:
  US08/731,894
• Time in Patent Office: 903 Days
• Field of Search: 606/205-210, 606/167, 606/170, 606/171, 606/174, 606/175, 606/139, 606/142, 606/144
• US Class Current: 606/205
• CPC Class Codes: A61B 17/2909 Handles
• CPC Class Codes: A61B 17/3201 Scissors for biopsy A61B10/02
• CPC Class Codes: A61B 2017/00464 for use with different instruments
• CPC Class Codes: A61B 2017/2918 flexible handles
• CPC Class Codes: A61B 2017/2919 details of linkages or pivot points
• CPC Class Codes: A61B 2017/2929 with a head rotatable about the longitudinal axis of the shaft
• CPC Class Codes: A61B 2017/305 Tweezer like handles with tubular extensions, inner slidable actuating members and distal tools, e.g. microsurgical instruments

Abstract

A surgical instrument includes a handle having a pair of actuating wings and a removable instrument tip. The instrument tip is constructed to perform a surgical operation. The handle includes an axially movable slider actuated by the actuating wings which operate the instrument tip. A shaft extends through the handle and is coupled to the instrument tip so that rotation of the shaft rotates the tip without interfering with the axial movement of the slider. The gripping surface of the actuating wings have a rounded surface to allow limited rotational movement of the instrument in the user'"'"'s hand. The gripping surfaces are inclined toward the instrument tip to resist the handle slipping from the user'"'"'s hand during use in the near vertical orientation.

Claims

1. A surgical instrument comprising:

a hollow instrument handle having a longitudinal axis and first and second longitudinal ends;

an instrument tip having a first end removably coupled to said second end of said handle, and a second end having a surgical tool for performing a surgical operation;

an actuation slider mounted in said instrument handle for axial movement therein, said actuation slider having an axial bore extending therethrough;

at least one manually operated actuation member operatively coupled to said actuation slider for producing said axial movement to said actuation slider;

a follower member coupled to said instrument tip and mounted in said handle and contacting said actuation slider for axial movement therewith;

rotation shaft means extending axially through said handle from said first end to said second end and through said actuation slider, said shaft means having a first end at said first end of said handle and a second end coupled to said instrument tip, wherein rotation of said shaft means within said handle causes rotation of said instrument tip.

2. The surgical instrument of claim 1, further comprising

first and second actuation wings, each wing having a first end at said first end of said handle and a second end at said second end of said handle, said wings being pivotal about said first end in an arcuate path toward said axis of said handle;

a lever arm coupled to each actuation wing and to said actuation slider, wherein pivotal movement of said actuation wings cause axial movement of said actuation slider toward said second end of said handle.

3. The surgical instrument of claim 2, wherein said second end of said actuation wings comprise

a substantially arcuate shaped gripping surface having a longitudinal axis which is inclined toward said second end of said handle at a first angle with respect to the axis of said handle, wherein said gripping surfaces together define a substantially frustoconical gripping surface.

4. The surgical instrument of claim 3, wherein a longitudinal axis of said first and second actuation wings in an actuated second position are inclined toward said second end of said handle at a second angle greater than said first-angle.

5. The surgical instrument of claim 2, wherein said handle further comprises

first and second non-slip surfaces on opposite sides of said handle and being positioned adjacent said gripping surfaces of said actuation wings and having an axis inclined toward said second end of said handle, said first and second non-slip surfaces of said handle defining a substantially frustoconical surface.

6. The surgical instrument of claim 2, wherein said handle further comprises

first and second surfaces on opposite sides of said handle and being positioned adjacent said actuation wings to substantially enclose an area between said actuation wings.

7. The surgical instrument of claim 1, wherein said instrument tip comprises

a head piece having first and second ends and an axial bore therethrough, a hollow tube received in said axial bore and extending from said first end of said head piece, a rod mounted in said hollow tube for relative axial movement between said rod and said tube, and

a spring biased slide member axially slidable within said head piece for producing said relative movement between said tube and rod, said slide member being acted upon by said follower member.

8. The surgical instrument of claim 7, wherein said rod is fixed to said head piece and said tube is fixed to said slide member for axial movement with respect to said rod.

9. The surgical instrument of claim 8, wherein said surgical tool is a pair of forcep jaws at said second end of said rod, said jaws being biased outwardly.

10. The surgical instrument of claim 1, further comprising

a core member having a first end coupled to said second end of said rotational shaft means,

said follower member having an axial bore receiving said core member, wherein said follower member is axially slidable on said core member.

11. The surgical instrument of claim 10, wherein said core member has an axial bore extending therethrough, and an elongated slot extending transversely therethrough, said elongated slot having a major axis oriented parallel to a longitudinal axis of said core member, and

a pin extending through said elongated slot and coupled to said follower member for coupling said follower member to said core member and limiting said axial movement of said follower member on said core member.

12. The surgical instrument of claim 1, further comprising a knob attached to said first end of said shaft means for rotating said instrument tip.

13. A surgical instrument comprising:

a handle having a longitudinal axis, first and second axial ends, and an axial bore extending therethrough;

an actuation slider mounted in said axial bore of said handle for limited axial movement therein, said actuation slider having an axial bore extending therethrough, and an axial face oriented toward said second end of said handle;

at least one manually operated actuation wing coupled to said actuation slider for causing said actuation slider to reciprocate axially in said handle;

a rotatable shaft having a first end at said first end of said handle and a second end extending through said axial bore of said actuation slider, said shaft being fixed axially with respect to said handle,

a core member having a first axial end coupled to said shaft for rotation therewith,

follower means coupled to said core member for limited axial movement with respect to said core member, said follower means abutting said axial face of said actuation slider whereby axial movement of said actuation slider imparts axial movement to said follower means;

an instrument tip removably coupled to said core member and including an instrument actuating means acted upon by said follower means wherein axial movement of said follower means and actuating means actuates said instrument tip, wherein said shaft, core member and instrument tip are rotatable with respect to said handle.

14. The surgical instrument of claim 13, wherein said core member has a second axial end and an axial bore therein.

15. The surgical instrument of claim 14, wherein said core member has a pair of elongated slots on opposite sides thereof and extending transversely through said core member, said elongated slots having a major axis extending parallel to a longitudinal axis of said core member,

said follower means having an axial bore, said core member being received within said axial bore of said follower means, and

a pin coupled to said follower means and extending through said elongated slots in said core member for coupling said follower means to said core member and for providing limited axial movement of said follower means on said core member.

16. The surgical instrument of claim 13, further comprising

a knob at said first end of said handle and being coupled to said shaft, wherein rotation of said knob rotates said instrument tip.

17. The surgical instrument of claim 13, wherein said instrument tip comprises

a head piece having first and second ends and an axial bore extending therethrough,

a hollow tube received in said axial bore and extending from said second end of said head piece,

a rod mounted in said hollow tube, wherein said hollow tube moves with respect to said rod, and

a slide member axially slidable within said head piece for producing relative movement between said rod and hollow tube, wherein said slide member is acted upon to said follower means.

18. The surgical instrument of claim 17, wherein

said tube is coupled to said slide member for axial movement therewith, and

said rod is fixed to said head piece.

19. The surgical instrument of claim 18, wherein said slide member has an elongated transverse slot and said head piece further comprises attachment means extending into said elongated transverse slot and engaging said rod to fix said rod to said head piece.

20. The surgical instrument of claim 13, further comprising

first and second manually operated lever arms coupled to said actuation slider, and

first and second spring biased actuation wings coupled to said first and second lever arms, respectively, said actuation wings having a first end being coupled to said handle and being pivotable inwardly about said first end of said handle from a first position toward said actuation slider to a second position.

21. The surgical instrument of claim 20, each said actuation wing comprising

a second end having substantially arcuate shaped gripping surface, each said gripping surface having a longitudinal axis which is inclined toward said second end of said handle at a first angle with respect to the axis of said handle, wherein said first and second gripping surfaces together define a substantially frustoconical gripping surface.

22. The surgical instrument of claim 21, wherein said longitudinal axis of said first and second actuation wings in said second position are inclined toward said second end of said handle at a second angle greater than said first angle.

23. The surgical instrument of claim 20, wherein said handle further comprises

first and second non-slip surfaces on opposite sides of said handle, each of said non-slip surfaces being positioned adjacent said gripping surfaces of said actuation wings and having an axis inclined toward said second end of said handle, said first and second non-slip surfaces of said handle defining a frustoconical surface.

24. A surgical instrument comprising:

an instrument handle having a longitudinal axis and first and second ends;

an instrument tool tip having a first end removably coupled to said second end of said handle and a second end having a surgical tool for performing a surgical operation,

an actuation assembly disposed in said handle for actuating said instrument tool tip; and

first and second manually operated actuation wings operatively coupled to said actuation assembly, each of said actuation wings having a gripping surface along a plane inclined with respect to said axis of said instrument handle and converging toward said second end, wherein said first and second gripping surfaces together define a substantially frustoconical shape.

25. The surgical instrument of claim 24, said instrument handle further comprising

first and second non-slip surfaces adjacent said gripping surfaces of said actuation wings, each of said first and second non-slip surfaces of said instrument handle being formed in a plane converging toward said second end, wherein said non-slip surfaces together define a substantially frustoconical shape.

26. The surgical instrument of claim 24, further comprising

rotation means at said first end of said instrument handle and being coupled to said instrument tool tip.

27. The surgical instrument of claim 26, wherein said actuation assembly includes an axial passage and said rotation means extends through said axial passage.

28. The surgical instrument of claim 24, wherein said actuation assembly comprises

an actuation slider having an axial passage therethrough;

rotation means having a first end extending from said first end of said instrument handle and a second end extending through said axial passage in said actuation slider;

a core member coupled to said second end of said rotation means; and

follower means engaging said actuation slider and being acted upon by said core member for limited axial movement, wherein said instrument tool tip is operated by said follower means.