Surgical tool system with quick release coupling assembly

• US 7,237,990 B2
• Filed: 12/13/2002
• Issued: 07/03/2007
• Est. Priority Date: 08/08/2002
• Status: Active Grant

• Current Assignee: Stryker Corporation
• Original Assignee: Stryker Corporation
• Inventors: Deng, Wenjie
• Primary Examiner(s): Carter; Monica
• Assistant Examiner(s): GATES, ERIC ANDREW
• Application Number:
  US10/319,300
• Publication Number:
  US 20040092991A1
• Time in Patent Office: 1,663 Days
• Field of Search: 409/175, 409/182, 279/79, 279/84
• US Class Current: 409/175
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/00482 with a code
• CPC Class Codes: A61B 90/98 using electromagnetic means, e.g. transponders
• CPC Class Codes: Y10T 279/17786 Spring
• CPC Class Codes: Y10T 279/17829 U-clamp
• CPC Class Codes: Y10T 409/306216 Randomly manipulated, work supported, or work following device
• CPC Class Codes: Y10T 409/306608 End mill [e.g., router, etc.]

Abstract

A surgical tool system with a handpiece and a cutting accessory that has inner and outer hubs. The handpiece has a spring biased lock ring that abuts a complementary stop member integral with the accessory outer hub to hold the accessory to the handpiece. An RFID chip is disposed against an inner wall of the accessory outer hub. An elastomeric seal pressed against the inner wall of the accessory outer hub provides environmental protection for the RFID chip. The seal has a rib that extends around the outer perimeter of the proximal end of the outer hub so as to form a seal between the accessory and an adjacent inner wall of the handpiece. Stop tabs extend inwardly from the seal to prevent the drive hub disposed inside the outer hub from falling out.

Claims

1. A powered surgical handpiece comprising:

a housing having a distal end defining a non-rotatable accessory coupling arrangement, said distal end having an accessory opening dimensioned to receive a proximal end of a cutting accessory, a lock slot contiguous with the accessory opening dimensioned to receive a lock tab that extends outwardly from the proximal end of the cutting accessory, and a groove that intersects the lock slot and opens into the accessory opening;

a power generating unit disposed within said housing for actuating the cutting accessory, said power generating unit including a coupling member for transferring power generated by said power generating unit to the cutting accessory;

a lock ring fitted in the distal end of said housing so as to surround the accessory opening and the lock slot, the groove accommodating a section of said lock ring that is disposed in the lock slot, wherein the groove and the lock slot each have a depth, the depth of the groove being greater than the depth of the lock slot, said lock ring and said distal end of said housing collectively dimensioned so that when said lock ring is moved to the release state, said lock ring seats in a portion of the groove below the lock slot;

a release button integral with said lock ring that is depressed to move said lock ring from the locked state to a release state in which said lock ring is clear of the lock slot;

a biasing member disposed between an outer surface of the distal end of said housing and said lock ring or said release button so as to bias said lock ring so that the release button is urged away from said distal end of said housing to hold said lock ring in a locked state wherein a section of said lock ring is disposed in the lock slot; and

a cover plate fitted over said lock ring and secured to said distal end of said housing to hold said lock ring thereto.

2. The powered surgical handpiece of claim 1, wherein

said housing includes a body and a collet that is attached to an end of said body to define the distal end of said housing.

3. A powered surgical handpiece comprising:

a housing having a distal end with an accessory opening dimensioned to receive a proximal end of a cutting accessory and a lock slot continguous with the accessory opening dimensioned to receive a first lock tab that extends outwardly from the proximal end of the cutting accessory, said housing including an auxiliary slot separate from the lock slot that opens into the accessory opening for receiving a second lock tab that extends outwardly from the proximal end of the cutting accessory;

a power generating unit disposed within said housing for actuating the cutting accessory, said power generating unit including a coupling member for transferring power generated by said power generating unit to the cutting accessory;

a lock ring movably fitted in the distal end of said housing so as to surround the accessory opening and the lock slot;

a biasing member disposed between said housing and said lock ring for holding said lock ring in a locked state wherein a section of said lock ring is disposed in the lock slot; and

a release button integral with said lock ring that is depressed to move said lock ring from the locked state to a release state in which said lock ring is clear of the lock slot.

4. The powered surgical handpiece of claim 3, wherein said lock ring is shaped to define an auxiliary indentation that at least partially subtends the area subtended by the auxiliary slot.

5. The powered surgical handpiece of claim 3, wherein:

said biasing member extends between an outer surface of said housing and said lock ring or said release button so as to bias said lock ring so that the release button is urged away from said housing; and

a cover plate is fitted over said lock ring and secured to said housing to hold said lock ring to said housing.

6. The powered surgical handpiece of claim 3, wherein:

said housing includes a body and a collet that is attached to an end of said body to form the distal end of said housing, said collet being formed to define the accessory opening and the lock slot; and

said lock ring is movably secured to said collet and said biasing member extends between said collet and said lock ring.

7. The powered surgical handpiece of claim 3, wherein said power generating unit is a motor, said motor having an output shaft that extends into the opening and the coupling member is integral with said output shaft.

8. A powered surgical handpiece comprising:

a housing having a distal end defining a non-rotatable accessory coupling arrangement, said distal end having an accessory opening dimensioned to receive a proximal end of a cutting accessory and a lock slot contiguous with the accessory opening dimensioned to receive a lock tab that extends outwardly from the proximal end of the cutting accessory;

a power generating unit disposed within said housing for actuating the cutting accessory, said power generating unit comprising a motor, said motor having an output shaft that extends into the opening, and a coupling member integral with said output shaft for transferring power generated by said power generating unit to the cutting accessory;

a lock ring fitted in the distal end of said housing so as to surround the accessory opening and the lock slot;

a biasing member disposed between the distal end of said housing and said lock ring for holding said lock ring in a locked state wherein a section of said lock ring is disposed in the lock slot; and

a release button integral with said lock ring that is depressed to move said lock ring from the locked state to a release state in which said lock ring is clear of the lock slot.

9. A powered surgical tool comprising:

a handpiece housing having a distal end and an accessory opening that extends inwardly from the distal end and that is dimensioned to receive an outer hub of a cutting accessory;

a collet attached to an end of said housing to form the distal end of said housing, said collet being formed to define a distal section of the accessory opening and a lock slot, said collet comprising;

a base disposed in said housing, a head that extends forward from said base and defines the distal end of said housing, and a skirt that extends from said head in surrounding relation with said base and is spaced away therefrom so as to define an annular space around said base;

a coil disposed in said collet within the annular space defined by said base and said skirt of said housing;

a motor disposed in said handpiece housing, said motor having a rotating output shaft and a coupling member attached to said output shaft for releasably coupling a drive hub of the cutting accessory to said output shaft so that said output shaft and said drive hub rotate in unison;

a coupling assembly attached to said handpiece housing for releasably and non-rotably securing the outer hub of the cutting accessory to said handpiece housing, said coupling assembly comprising;

the lock slot defined in said collet extending longitudinally inwardly from the distal end of said housing and contiguous with the accessory opening, the lock slot being dimensioned to receive a lock tab that extends from an outer surface of the outer hub;

a lock ring movably secured to said collet, said lock ring positioned to surround the accessory opening and the lock slot, said lock ring positioned to selectively intersect the lock slot;

a biasing member extending between said collet and said lock ring for urging said lock ring into a locked state in which a section of said lock ring intersects the lock slot; and

a release button integral with said lock ring that is depressed to move said lock ring from the locked state to a release state wherein said lock ring is spaced from the lock slot.

10. The powered surgical tool of claim 9, wherein:

said handpiece housing is formed with a groove that opens into the accessory opening, the groove being positioned to intersect the lock slot, wherein the groove and the lock slot each have a depth, the depth of the groove being greater than the depth of the lock slot; and

said lock ring and said handpiece housing are collectively dimensioned so that when said lock ring is moved to the release state, said lock ring seats in a portion of the groove below the lock slot.

11. The powered surgical tool of claim 9, wherein said coupling assembly is formed so that said lock slot and said release button are located opposite each other.

12. A powered surgical tool comprising:

a handpiece having a distal end and an accessory opening that extends inwardly from the distal end that is dimensioned to receive an outer hub of a cutting accessory;

a motor disposed in said handpiece, said motor having a rotating output shaft and a coupling member attached to said output shaft for releasably coupling a drive hub of the cutting accessory to said output shaft so that said output shaft and said drive hub rotate in unison;

a coupling assembly attached to said handpiece for releasably holding the outer hub of the cutting accessory to said handpiece, said coupling assembly comprising;

a lock slot defined in said handpiece that extends longitudinally inwardly from the distal end thereof and that is contiguous with the accessory opening, the lock slot being dimensioned to receive a first lock tab that extends from an outer surface of the outer hub;

an auxiliary slot formed in said handpiece and being separate from the lock slot and opening into the accessory opening for receiving a second lock tab that extends outwardly from the outer hub of the cutting accessory;

a lock ring mounted to said handpiece, said lock ring being positioned to surround the accessory opening and the lock slot, said lock ring being movably mounted to said handpiece and positioned to selectively intersect the lock slot, said lock ring being shaped to define an auxiliary indentation that at least partially subtends the area subtended by the auxiliary slot;

a biasing member disposed between said handpiece and said lock ring for urging said lock ring into a locked state in which a section of said lock ring intersects the lock slot; and

a release button integral with said lock ring that is depressed to move said lock ring from the locked state to a release state wherein said lock ring is spaced from the lock slot.

13. The powered surgical tool of claim 12, wherein said coupling assembly is formed so that said lock slot and said release button are located opposite each other.

14. The powered surgical tool of claim 12, wherein:

said handpiece includes a housing and a collet that is attached to an end of said housing to form the distal end thereof, said collet being formed to define a distal section of the accessory opening and the lock slot; and

said lock ring is movably secured to said collet and said biasing member extends between said collet and said lock ring.

15. A powered surgical handpiece comprising:

a housing having a distal end with an accessory opening dimensioned to receive the proximal end of a cutting accessory and a lock slot contiguous with the accessory opening dimensioned to receive a lock tab that extends outwardly from a proximal end of the cutting accessory;

a power generating unit disposed within said housing for actuating the cutting accessory, said power generating unit including a coupling member for transferring power generated by said power generating unit to the cutting accessory;

a lock ring disposed in the distal end of said housing so as to surround the accessory opening and the lock slot;

a biasing member disposed between said housing and said lock ring for holding said lock ring in a locked state wherein a section of said lock ring is disposed in the lock slot; and

a release button connected to said lock ring that is depressed to move said lock ring from the locked state to a release state in which said lock ring is clear of the lock slot, said lock ring being configured to receive and lock the cutting accessory to said housing without depressing of the release button.

16. The powered surgical handpiece of claim 15, wherein said lock ring includes a lip having a tapered face so that contact with a tapered face of the lock tab enables movement of the accessory to overcome the force of the biasing member to enable the handpiece to receive the cutting accessory without depressing of the release button.

17. The powered surgical handpiece of claim 15, wherein:

said handpiece is formed with a groove that opens into the accessory opening, the groove intersecting the lock slot and being positioned to accommodate the section of said lock ring that is disposed in the lock slot, wherein the groove and the lock slot each have a depth, the depth of the groove being greater than the depth of the lock slot; and

said lock ring and said handpiece are collectively dimensioned so that when said lock ring is moved to the release state, said lock ring seats in a portion of the groove below the lock slot.

18. The powered surgical handpiece of claim 15, wherein said handpiece is further formed to have an auxiliary slot separate from the lock slot that opens into the accessory opening for receiving a second lock tab that extends outwardly from the proximal end of the cutting accessory.

19. The powered surgical handpiece of claim 15, wherein:

said biasing member extends between a surface of said housing and said lock ring or said release button so as to bias said lock ring and said housing so that the release button is urged away from said housing; and

a cover plate is fitted over said lock ring and secured to said housing to hold said lock ring to said housing.

20. The powered surgical handpiece of claim 15, wherein:

said housing includes a body and a collet that is attached to an end of said body to form the distal end of said housing, said collet being formed to define the accessory opening and the lock slot; and

said lock ring is movably secured to said collet and said biasing member extends between said collet and said lock ring.

21. The powered surgical handpiece of claim 15, wherein said power generating unit is a motor, said motor having an output shaft that extends into the opening and the coupling member is integral with said output shaft.

22. A powered surgical handpiece comprising:

a housing having a distal end with an accessory opening dimensioned to receive the proximal end of a cutting accessory and a lock slot contiguous with the accessory opening dimensioned to receive a first lock tab that extends outwardly from the proximal end of the cutting accessory;

a power generating unit disposed within said housing for actuating the cutting accessory, said power generating unit including a coupling member for transferring power generated by said power generating unit to the cutting accessory;

a lock ring slidably fitted in the distal end of said housing so as to surround the accessory opening and the lock slot;

a release button associated with said lock ring; and

a biasing member disposed between an outer face of said housing and said release button to hold said lock ring in a locked state wherein a section of said lock ring is disposed in the lock slot, wherein the release button is depressed to move said lock ring from the locked state to a release state in which said lock ring is clear of the lock slot.

23. The powered surgical handpiece of claim 22, wherein:

said handpiece is formed with a groove that opens into the accessory opening, the groove intersecting the lock slot and being positioned to accommodate the section of said lock ring that is disposed in the lock slot, wherein the groove and the lock slot each have a depth, the depth of the groove being greater than the depth of the lock slot; and

said lock ring and said handpiece are collectively dimensioned so that when said lock ring is moved to the release state, said lock ring seats in a portion of the groove below the lock slot.

24. The powered surgical handpiece of claim 22, wherein said handpiece is further formed to have an auxiliary slot separate from the lock slot that opens into the accessory opening for receiving a second lock tab that extends outwardly from the proximal end of the cutting accessory.

25. The powered surgical handpiece of claim 22, wherein:

said biasing member urges the release button away from said housing; and

a cover plate is fitted over said lock ring and secured to said housing to hold said lock ring to said housing.

26. The powered surgical handpiece of claim 22, wherein:

said housing includes a body and a collet that is attached to an end of said body to form the distal end of said housing, said collet being formed to define the accessory opening with the lock slot; and

said lock ring is slidably secured to said collet and said biasing member extends between said collet and said lock ring.

27. The powered surgical handpiece of claim 22, wherein said power generating unit is a motor, said motor having an output shaft that extends into the opening and the coupling member is integral with said output shaft.