Powered surgical handpiece assemblies and handpiece adapter assemblies

• US 6,368,324 B1
• Filed: 09/24/1999
• Issued: 04/09/2002
• Est. Priority Date: 09/24/1999
• Status: Expired due to Term

• Current Assignee: Medtronic Xomed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Xomed Incorporated (Medtronic Plc)
• Inventors: Dinger, Fred B., Cleveland, John T.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US09/404,460
• Time in Patent Office: 928 Days
• Field of Search: 606/171, 606/177, 606/85, 606/84, 303/92, 384/49, 279/43, 279/50, 279/69, 433/118, 433/129
• US Class Current: 606/85
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1657 Bone breaking devices
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1688 for the sinus or nose
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable for prosthetic joint-implanting tools A61F2/4603
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/320028 with reciprocating movements

Abstract

A surgical handpiece adapter for converting rotary motion of a powered surgical handpiece into reciprocating motion to drive a cutting member includes a rear drive shaft for being removably coupled to a rotatable drive shaft of the handpiece, a front drive shaft for being removably coupled to the cutting member and a motion converting mechanism causing reciprocation of the front drive shaft and, therefore, the cutting member coupled thereto, in response to rotation of the rear drive shaft by the drive shaft of the handpiece. A handpiece adapter assembly is formed by an adapter and a cutting member coupled thereto, and a powered surgical handpiece assembly is formed by an adapter, a cutting member coupled to the adapter and a powered surgical handpiece coupled to the adapter. A cutting member includes a surgical suction rasp for being reciprocatively driven to cut anatomical tissue and having a tissue cutting surface and a suction passage with an inlet opening along the tissue cutting surface for removing anatomical debris from an operative site at which the rasp is used. A cutting member includes an osteotome for being reciprocatively power driven to cut anatomical tissue and having a cutting edge and a blunt tip extending distally of the cutting edge. A method of facial surgery includes the steps of reciprocating a distal end of a rasp to reshape the nasal bone of a patient and removing anatomical debris through a suction passage of the rasp while the nasal bone is being reshaped. Another method of facial surgery includes the steps of reciprocating a distal end of an osteotome via a powered surgical handpiece and moving the distal end of the osteotome, while it is being reciprocated, forwardly along the nasal bone of a patient in a predetermined path with a cutting edge of the osteotome in contact with the nasal bone to make a cut of desired length in the nasal bone along the predetermined path.

Claims

1. A powered surgical handpiece assembly comprising

a powered surgical handpiece having a rotatable drive shaft, said handpiece having an open distal end and a passage extending proximally from said open distal end in communication with said drive shaft;

a handpiece adapter including a housing, a rear drive shaft having a distal end disposed in said housing and a proximal end removably, drivingly engaged with said drive shaft of said handpiece, a front drive shaft having a distal end and a proximal end, and a motion converting mechanism mechanically coupling said proximal end of said front drive shaft with said distal end of said rear drive shaft, said housing including a central longitudinal axis and a plurality of longitudinally extending internal grooves parallel to said central longitudinal axis, said proximal end of said front drive shaft being reciprocatively mounted in said housing, said distal end of said front drive shaft being disposed externally of said housing and said proximal end of said front drive shaft including a plurality of longitudinally extending external grooves, said external grooves being parallel to said central longitudinal axis, each of said external grooves forming an aligned pair of grooves with one of said internal grooves, respectively, and further including a plurality of ball members captured between said housing and said front drive shaft with said ball members including a cam at said distal end of said rear drive shaft and a cam follower at said proximal end of said front drive shaft, said rear drive shaft being rotatable with said drive shaft of said handpiece, said cam being rotatable with said rear drive shaft, said cam follower being reciprocatively moved by said cam to reciprocate said front drive shaft in response to rotation of said cam by said rear drive shaft; and

a cutting member having a proximal end removably coupled with said distal end of said front drive and having a distal end for cutting anatomical tissue, said cutting member being reciprocatively driven by said front drive shaft of said adapter when said front drive shaft is reciprocated, via said motion converting mechanism, in response to rotation of said drive shaft of said handpiece.

2. A powered surgical handpiece assembly as recited in claim 1 wherein said distal end of said front drive shaft includes a passage for receiving said proximal end of said cutting member.

3. A powered surgical handpiece assembly as recited in claim 2 and further including an operating member carried on said front drive shaft for selectively opening said passage to receive said proximal end of said cutting member and for selectively closing said passage to secure said proximal end of said cutting member to said front drive shaft.

4. A powered surgical handpiece assembly as recited in claim 3 wherein said operating member is movable longitudinally relative to and along said front drive shaft in a first longitudinal direction to selectively open said passage and is movable longitudinally relative to and along said front drive shaft in a second longitudinal direction to selectively close said passage.

5. A powered surgical handpiece assembly as recited in claim 4 wherein said operating member includes a longitudinal passage extending entirely therethrough and said front drive shaft is disposed in said passage of said operating member to pass entirely through said operating member, said operating member being rotatable relative to said front drive shaft, said operating member being movable longitudinally in said first longitudinal direction in response to rotation of said operating member in a first rotational direction relative to said front drive shaft, said operating member being movable longitudinally in said second longitudinal direction in response to rotation of said operating member in a second rational direction, opposite said first rotational direction, relative to said front drive shaft.

6. A powered surgical handpiece assembly as recited in claim 5 wherein said distal end of said front drive shaft is formed as a collet defining a plurality of longitudinally extending legs, said legs being movable in a radially outward direction to receive said proximal end of said cutting member in said first longitudinal direction, said legs being movable in a radially inward direction to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

7. A powered surgical handpiece assembly as recited in claim 5 wherein a locking membe is disposed in an aperture formed in said front drive shaft and communicating with said passage of said front drive shaft, said locking member being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said first longitudinal direction, said locking member being moved in a radially inward direction to protrude through said aperture into said passage of said front drive shaft so as to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

8. A powered surgical handpiece assembly as recited in claim 7 wherein said locking member is spherical.

9. A powered surgical handpiece assembly as recited in claim 7 and further including an insert disposed in said passage of said operating member and maintaining alignment of said locking member with said aperture.

10. A powered surgical handpiece assembly as recited in claim 1 wherein said cam includes a cam head having an angled track therein and said cam follower is disposed in said track.

11. A powered surgical handpiece assembly as recited in claim 10 wherein said proximal end of said front drive shaft has a recess therein and said cam head is rotatably disposed in said recess.

12. A powered surgical handpiece assembly as recited in claim 11 wherein said cam has a central longitudinal axis and said cam head includes forward and rearward cam head sections between which said track is disposed, said rearward cam head section having a maximum length and a minimum length disposed at a 180°

spaced location from said maximum length about said central longitudinal axis of said cam, said cam follower includes a protrusion on said front drive shaft disposed in said track, said distal end of said front drive shaft being in a maximum longitudinal position beyond said housing when said maximum length is in longitudinal alignment with said protrusion and being in a minimum longitudinal position beyond said housing when said minimum length is in longitudinal alignment withs aid protrusion.

13. A powered surgical handpiece assembly as recited in claim 12 wherein said cam head has an overall length and said recess has a length greater than said overall length of said cam head allowing said front drive shaft to reciprocate relative to said rear drive shaft.

14. A powered surgical handpiece assembly as recited in claim 13 wherein said proximal end of said rear drive shaft is configured for mechanical coupling with said drive shaft of said powered surgical handpiece.

15. A powered surgical handpiece assembly as recited in claim 14 wherein said proximal end of said rear drive shaft includes a slot for receiving a drive pin on said drive shaft of said powered surgical handpiece.

16. A powered surgical handpiece assembly comprising

a powered surgical handpiece having a rotatable drive shaft, said handpiece having an open distal end and a passage extending proximally from said open distal end in communication with said drive shaft;

a handpiece adapter including a housing, a rear drive shaft having a distal end disposed in said housing and a proximal end removably, drivingly engaged with said drive shaft of said handpiece, a front drive shaft having a distal end and a proximal end, and a motion converting mechanism mechanically coupling said proximal end of said front drive shaft with said distal end of said rear drive shaft, said proximal end of said front drive shaft being reciprocatively mounted in said housing and said distal end of said front drive shaft being disposed externally of said housing, said motion converting mechanism including a cam at said distal end of said rear drive shaft and a cam follower at said proximal end of said front drive shaft, said reear drive shaft being rotatable with said drive shaft of said handpiece, said cam being rotatable with sid rear drive shaft, said cam follower being reciprocatively moved by said cam to reciprocate said front drive shaft in response to rotation of said cam by said rear drive shaft, said cam having a central longitudinal axis and including a cam head disposed in said housing, said cam having an angled track therein within which said cam follower is disposed, said cam head including forward and rearward cam head sections between which said track is disposed, said rearward cam head section having a maximum length and a minimum length disposed at a 180°

spaced location from said maximum length about said central longitudinal axis of said cam, said cam follower including a protrusion on said front drive shaft disposed in said track, said distal end of said front drive shaft being in a maximum longitudinal position beyond said housing when said maximum length is in longitudinal alignment with said protrusion; and

a cutting member having a proximal end removably coupled with said distal end of said front drive shaft and having a distal end for cutting anatomical tissue, said cutting member being reciprocatively driven by said front drive shaft of said adapter when said front drive shaft is reciprocated, via said motion converting mechanism, in response to rotation of said drive shaft of said handpiece.

17. A powered surgical handpiece assembly as recited in claim 16 wherein said proximal end of said front drive shaft has a recess therein and said cam head is rotatably disposed in said recess, said cam head has an overall length and said recess has a length greater than said overall length of said cam head allowing said front drive shaft to reciprocate relative to said rear drive shaft.

18. A powered surgical handpiece assembly comprising

a powered surgical handpiece having a rotatable drive shaft, said handpiece having an open distal end and a passage extending proximally from said open distal end in communication with said drive shaft;

a handpiece adapter including a housing, a rear drive shaft having a distal end disposed in said housing and a proximal end removably, drivingly engaged with said drive shaft of said handpiece, a front drive shaft having a distal end and a proximal end, and a motion converting mechanism mechanically coupling said proximal end of said front drive shaft with said distal end of said rear drive shaft, said motion converting mechanism including a cam at said distal end of said rear drive shaft and a cam follower at said proximal end of said front drive shaft, said rear drive shaft being rotatable with said drive shaft of said handpiece, said cam being rotatable with said rear drive shaft, said cam follower being reciprocatively moved by said cam to reciprocate said front drive shaft in response to rotation of said cam by said rear drive shaft;

a cutting member having a proximal end removably coupled with said distal end of said front drive shaft and having a distal end for cutting anatomical tissue, said cutting member being reciprocatively driven by said front drive shaft of said adapter when said front drive shaft is reciprocated, via said motion converting mechanism, in response to rotation of said drive shaft of said handpiece, said said distal end of said front drive shaft including a passage receiving said proximal end of said cutting member; and

an operating member carried on said front drive shaft for selectively opening said passage to receive said proximal end of said cutting member and for selectively closing said passage to secure said proximal end of said cutting member to said front drive shaft, said operating member including a longitudinal passage extending entirely therethrough and said front drive shaft being disposed in said passage of said operating member to pass entirely therethrough, said operating member being rotatable relative to said front drive shaft, said operating member being movable longitudinally in a first longitudinal direction in response to rotation of said operating member being movable longitudinally in a second longitudinal direction in response to rotation of said operating member in a second rotational direction, opposite said first rotational direction, relative to said front drive shaft.

19. A powered surgical handpiece assembly as recited in claim 18 wherein said handpiece adapter is reusable.

20. A powered surgical handpiece assembly as recited in claim 18 wherein said cutting member is a rasp.

21. A powered surgical handpiece assembly as recited in claim 19 wherein said cutting member is an osteotome.

22. A powered surgical handpiece assembly as recited in claim 19 wherein said handpiece is an XPS^™

StraightShot handpiece.

23. A powered surgical handpiece assembly as recited in claim 22 wherein said cutting member is a rasp.

24. A powered surgical handpiece assembly as recited in claim 22 wherein said cutting member is an osteotome.

25. A powered surgical handpiece assembly as recited in claim 32 wherein said handpiece and said adapter are reusable and said cutting member is disposable.

26. A powered surgical handpiece assembly as recited in claim 18 wherein said front drive shaft includes an alignment member and said proximal end of said cutting member is adapted to engage said alignment member when said distal end of said cutting member is in a specific orientation for use of said powered surgical handpiece assembly.

27. A powered surgical handpiece assembly as recited in claim 26 wherein said alignment member includes a post and said proximal end of said cutting member has a slot therein for receiving said post when said distal end of said cutting member is in said specific orientation.

28. A powered surgical handpiece assembly as recited in claim 27 wherein said drive shaft of said handpiece includes a pin and said proximal end of said rear drive shaft includes a slot for receiving said pin when said distal end of said cutting member is in said specific orientation.

29. A powered surgical handpiece assembly as recited in claim 27 wherein said proximal end of said rear drive shaft includes spaced prongs and said drive shaft of said handpiece includes a pin for being received between said prongs when said distal end of said cutting member is in said specific orientation.

30. A powered surgical handpiece assembly as recited in claim 18 wherein said distal end of said front drive shaft is formed as a collet defining a plurality of longitudinally extending legs, said legs being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said first longitudinal direction, said legs being moved in a radially inward direction to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

31. A powered surgical handpiece assembly as recited in claim 18 wherein a locking member is disposed in an aperture formed in said front drive shaft and communicating with said passage of said front drive shaft, said locking member being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said first longitudinal direction, said locking member being moved in a radially inward direction to protrude through said aperture into said passage of said front drive shaft so as to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

32. A powered surgical handpiece assembly as recited in claim 31 wherein said locking member is configured as a ball.

33. A powered surgical handpiece assembly as recited in claim 31 wherein said proximal end of said cutting member has an external annular groove and said locking member is received in said groove when said operating member is moved in said second longitudinal direction to lock said cutting member to said front drive shaft.

34. A handpiece adapter assembly for apowered surgical handpiece comprising

a handpiece adapter including a housing, rear drive shaft having a proximal end for being removably coupled with a rotatable drive shaft of a powered surgical handpiece and having a distal end, a front drive shaft having an open distal end disposed distally of said housing and having a proximal end, a motion converting mechanism by which said proximal end of said front drive shaft is in driving engagement with said distal end of said rear drive shaft, and an alignment member in said housing, said rear drive shaft being rotatable with the drive shaft of the handpiece when said drive shaft is coupled therewith, said motion converting mechanism including a cam rotatable with said rear drive shaft and a cam follower reciprocatively moved by said cam in response to rotation of said cam with said rear drive shaft, said front drive shaft being movable with said cam follower whereby said front drive shaft is reciprocated relative to said rear drive shaft when said rear drive shaft is rotated by the drive shaft of the handpiece, said front drive shaft having a longitudinal passage extending proximally from said open distal end to terminate in said housing, said alignment member being disposed in said passage;

and

a cutting member having a proximal end removably coupled with said distal end of said front drive shaft and having a distal end for cutting anatomical tissue, said cutting member being reciprocatively driven by said front drive shaft of said adapter when said front drive shaft is reciprocated in response to rotation of said rear drive shaft by the drive shaft of the handpiece, said proximal end of said cutting member being configured to drivingly engage said alignment member to removably couple said proximal end of said cutting member to said distal end of said front drive shaft with said distal end of said cutting member in a predetermined orientation relative to said adapter.

35. A handpiece adapter assembly as recited in claim 34 wherein said alignment member includes a post extending transversely within said passage and said proximal end of said cutting member includes a slot receiving said post.

36. A handpiece adapter assembly as recited in claim 34 wherein said alignment member includes a post extending transversely within said passage and said proximal end of said cutting member includes spaced prongs receiving said post therebetween.

37. A handpiece adapter assembly as recited in claim 34 wherein said proximal end of said rear drive shaft has a configuration to drivingly engage the drive shaft of the handpiece when said distal end of said cutting member is in said predetermined orientation relative to the handpiece.

38. A handpiece adapter assembly as recited in claim 34 wherein said cutting member is a rasp.

39. A handpiece adapter assembly as recited in claim 34 wherein said cutting member is an osteotome.

40. A handpiece adapter assembly as recited in claim 34 wherein said adapter is reusable and said cutting member is disposable.

41. A handpiece adapter assembly as recited in claim 34 wherein said cam head has a central longitudinal axis and includes a cam disposed in said housing, said cam has an angled track therein within which said cam follower is disposed, said cam head includes forward and rearward cam head sections between which said track is disposed, said rearward cam head section having a maximum length and a minimum length disposed at a 180°

spaced location from said maximum length about said central longitudinal axis of said cam said cam follower includes a protrusion on said front drive shaft disposed in said track, said distal end of said front drive shaft being in a maximum longitudinal position beyond said housing when said maximum length is in longitudinal alignment with said protrusion and being in a minimum longitudinal position beyond said housing when said minimum length is in longitudinal alignment with said protrusion.

42. A handpiece assembly as recited in claim 41 wherein said proximal end of said front drive shaft has a recess therein and said cam head is rotatably disposed in said recess, said cam head has an overall length and said recess has a length greater than said overall length of said cam head allowing said front drive shaft to reciprocate relative to said rear drive shaft.

43. A handpiece adapter assembly as recited in claim 34 wherein said adapter includes an operating member carried on said front drive shaft for selectively opening said passage to receive said proximal end of said cutting member and for selectively closing said passage to secure said proximal end of said cutting member to said front drive shaft, said operating member includes a longitudinal passage extending entirely therethrough and said front drive shaft is disposed in said passage of said operating member to pass entirely therethrough, said operating member is rotatable relative to said front drive shaft, said operating member is movable longitudinally in a first longitudinal direction in response to rotation of said operating member in a first rotational direction relative to said front drive shaft, said operating member is movable longitudinally in a second longitudinal direction in response to rotation of said operating member in a second rotational direction, opposite said first rotational direction, relative to said front drive shaft.

44. A handpiece adapter assembly as recited in claim 43 wherein said distal end of said front drive shaft is formed as a collet defining a plurality of longitudinally extending legs, said legs being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said first longitudinal direction, said legs being moved in a radially inward direction to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

45. A handpiece adapter assembly as recited in claim 43 wherein a locking member is disposed in an aperture formed in said front drive shaft and communicating with said passage of said front drive shaft, said locking member being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft, said locking member being movable in a radially outward direction to receive said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said first longitudinal direction, said locking member being moved in a radially inward direction to protrude through said aperture into said passage of said front drive shaft so as to engage said proximal end of said cutting member in said passage of said front drive shaft when said operating member is moved in said second longitudinal direction.

46. A handpiece adapter assembly as recited in claim 45 wherein said locking member is spherical.

47. A handpiece adapter assembly as recited in claim 45 wherein said proximal end of said cutting member has an external annular groove and said locking member is received in said groove when said operating member is moved in said second longitudinal direction to lock said cutting member to said front drive shaft.