Multi-purpose surgical tool system

• US 6,045,564 A
• Filed: 11/14/1997
• Issued: 04/04/2000
• Est. Priority Date: 08/02/1996
• Status: Expired due to Term

• Current Assignee: Stryker Corporation
• Original Assignee: Stryker Corporation
• Inventors: Walen, James G.
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): TRINH, HOA B
• Application Number:
  US08/970,603
• Time in Patent Office: 872 Days
• Field of Search: 606/167-171, 606/79, 606/80, 606/185, 606/180, 279/131, 30/166.3, 433/128
• US Class Current: 606/167
• CPC Class Codes: A61B 17/1622 Drill handpieces A61B17/1626, A61B17/1628 take precedence
• CPC Class Codes: A61B 17/1633 Sleeves, i.e. non-rotating parts surrounding the bit shaft, e.g. the sleeve forming a single unit with the bit shaft A61B17/1644 takes precedence
• CPC Class Codes: A61B 2017/00464 for use with different instruments
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: B25F 3/00 Associations of tools for different working operations with one portable power-drive means; Adapters therefor

Abstract

A surgical tool system (20) with replaceable surgical cutting accessories (26) and attachments (34) for holding the tools. This system includes a handpiece (22) to which the cutting accessory and attachment are releasably attached. Collet (50) located inside a drill housing (44) located at one end of the handpiece securely fastens the surgical tool to a motor (24) also located in the handpiece. Leaf spring assembly (46) flush with the drill housing releasably secures the attachment in place. A single actuating collar (52) located around the outside of the drill housing both controls the locking force supplied by the collet and selectively relaxes the leaf spring assembly.

Claims

1. An attachment for connection to a surgical handpiece, said attachment including:

an attachment housing, said attachment housing defining a center space for fitting said attachment housing over the surgical handpiece and said attachment housing having a base positioned to be located against the surgical handpiece and a plurality of teeth positioned to engage the surgical handpiece so as to hold said attachment housing static relative to said surgical handpiece; and

a cylindrical shaft rotatingly fitted to said attachment housing so as to extend through said center space of said attachment housing and into the handpiece, said shaft having a diameter and an axis and being further shaped to have a locking section integrally formed therewith, said lock ring being shaped to have a plurality of planar faces so as that said locking section has a polygonal cross section profile that has a diameter less than said diameter of said shaft wherein said faces forming said locking section meet at corners and said locking section is further shaped so that at least two corners are spaced a first distance from the axis of the shaft and at least one corner spaced a second distance from the axis of the shaft.

2. The attachment of claim 1, wherein said locking section of said shaft is further shaped so that at least two opposed corners thereof are shaped to define a straight edge between said faces forming said corners.

3. The attachment of claim 2, wherein said locking section has at least six said faces.

4. The attachment of claim 2, wherein said locking section is formed so as to have a single pair of opposed corners that define straight edges therebetween.

5. The attachment of claim 1, wherein said shaft is removably insertable into said attachment housing.

6. The attachment of claim 5, further including at least one bearing assembly disposed in said attachment housing so as to provide a rotating interface between said shaft and said attachment housing.

7. The attachment of claim 1, wherein:

said attachment housing is formed with a first section containing said center space and a second section that is angled relative to said first section;

said shaft is fixedly secured to said first section of said attachment housing; and

a coupling assembling assembly is disposed in said second section of said attachment housing, said coupling assembly being configured to releasably secure a cutting accessory thereto, and said coupling assembly is connected to said shaft for rotating in response to rotational motion of said shaft.

8. The attachment of claim 1, wherein:

said shaft is rotatably secured to said attachment housing; and

a coupling assembly is disposed in said attachment housing for releasably receiving a cutting accessory, said coupling assembly being connected to said shaft for rotating in response to rotational motion of said shaft.

9. An attachment for connection to a surgical handpiece having a front end formed with slots, said attachment comprising:

a housing having opposed front and rear ends, said housing having a center space extending forward from said rear end for fitting said housing over said surgical handpiece and a center bore that extends from said center space to said housing front end for accommodating a cutting accessory therein; and

an inwardly directed lip integral with said housing located adjacent said rear end, said lip being formed with spaced-apart teeth that are inwardly directed towards the center space for engaging the slots in the surgical handpiece to prevent rotation of the attachment housing.

10. The attachment of claim 9, further including a retainer attached to said rear end of said housing that extends away from said housing wherein said lip is integrally formed with said retainer so as to be spaced from said housing.

11. The attachment of claim 9, further including at least one bearing assembly disposed in said housing so as to be located around said center bore for providing a rotating interface between a shaft in said center bore and said housing.

12. An attachment for coupling a cutting accessory to a surgical handpiece, the surgical handpiece having a motor;

said attachment including;

an attachment housing have opposed front and rear ends, said attachment housing having a center space that extends forward from said rear end for positioning said attachment housing over the surgical handpiece and an inwardly directed lip located adjacent said rear end, said lip having teeth for engaging the surgical handpiece to prevent rotation of said attachment housing;

a drive shaft rotatably secured to said attachment housing that extends away from said rear end of said attachment housing for connection to the motor of the surgical handpiece; and

a coupling assembly disposed in said front end of said attachment housing, said coupling assembly including;

a collet housing coupled to said drive shaft to rotate with said drive shaft, said collet housing having an axially extending shaft bore for receiving a shaft of the cutting accessory, and said collet housing shaped to form at least one opening that extends into said shaft bore;

a locking member position adjacent each said opening in said collet housing for selective positioning in said shaft bore of said collet housing so that when said locking member is positioned in said shaft bore of said collet housing, said locking member holds the shaft of the cutting accessory for rotation with said drive shaft and when said locking member is spaced from said shaft bore, the shaft of the cutting accessory is removable from said shaft bore of said collet housing;

a lock ring disposed around said collet housing and displaceable along said collet housing from a first position wherein said lock ring abuts said locking member so as to latch said locking member into said shaft bore of said collet housing and a second position wherein said lock ring is spaced from said locking member;

a biasing member that normally urges said lock ring into said lock ring first position;

a lock ring actuator disposed around said lock ring for selectively abutting said lock ring to move said lock ring from said lock ring first position to said lock ring second position; and

a displaceable actuating member that is fitted over said attachment housing and is coupled to said lock ring actuator, said actuating member being movable between a run position and an accessory load position, wherein when said actuating member is moved from said run position to said accessory load position, said actuating member causes said lock ring actuator to abut said lock ring so as to cause said lock ring to move to said lock ring second position and said actuating member remains in said accessory load position until displaced from said accessory load position.

13. The attachment of claim 12, wherein said actuating member is a collar rotatably fitted over said front end of said attachment housing.

14. The attachment of claim 12, wherein said attachment housing is formed from a first section containing said center space and from which said drive shaft extends and a second section that is angled from said first section wherein said coupling assembly is disposed in said second section.

15. The attachment of claim 12, wherein said drive shaft has a diameter and an elongated axis and is further shaped to have a locking section integrally formed therewith, said locking section being shaped to have a plurality of planar faces so as that said locking section has a polygonal cross section profile that has a diameter less than said diameter of said shaft wherein said faces forming said locking section meet at corners and said locking section is further shaped so that at least two corners are spaced a first distance from the axis of the shaft and at least one corner spaced a second distance from the axis of the shaft different from the first distance.