Chucks or sockets – Socket type – Spring biased jaws
Reexamination Certificate
1999-04-30
2001-04-03
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Spring biased jaws
C279S052000, C279S143000, C408S23900A, C433S129000, C606S170000, C606S180000
Reexamination Certificate
active
06209886
ABSTRACT:
TECHNICAL FIELD
This invention relates in general to surgical resecting tools for cutting human bone and in particular to a resecting tool which is capable of a range of independent extension lengths for both the tool implement and its guide sleeve.
BACKGROUND ART
A surgical resecting tool for cutting human bone uses a detachable motor coupled to the end of a hose to drive a chuck located inside the tool. The chuck engages the shaft of a tool implement which extends from the resecting tool. The distal end of the implement has a tool head which may be configured to perform a variety of procedures. A guide sleeve is used in conjunction with the implement to further support the otherwise cantilevered implement. The guide sleeve also extends from the resecting tool and is concentric with the implement. The motor rotates the chuck to drive the implement at very high rotational speeds within the guide sleeve.
In one type of prior art, the chuck was tightened by a threaded nut to frictionally grip the shaft for transmitting torque. In another type of prior art tool, the shaft of the implement has an axial grip feature and a drive feature, such as a flat, that interfaces with and is closely received by a drive key on the chuck inside the resecting tool. These grip and drive features require precise tolerances and axial positioning within the tool when the implement is installed.
In some tools, the guide sleeve can be adjusted relative to the resecting implement to vary the axial distance that the guide sleeve extends from the tool. Also, quick-release features are known. Still, improvements to these prior art tools are desired.
SUMMARY OF THE INVENTION
A resecting tool contains a rotatable chuck inside a base for engaging the drive shaft of a motor. The chuck extends into a tubular casing that has an outer actuator sleeve. The sleeve is limited to rotation relative to the casing and is used to move a pair of locking elements or balls in separate helical slots in the casing. Each ball is seated in a collar that abuts a collet receiver inside the casing. During implement changeover, the collar abuts the collet receiver and acts as a brake to prevent accidental actuation of the chuck and the tool implement. The collet receiver is spring-biased into contact with a first collet which closely receives a tool implement within the resecting tool. The sleeve is used to manipulate the collet to clamp onto and unclamp the tool implement.
A collet coupling is located on the front end of the casing and has a collet nut on its forward end. The collet nut houses a second collet with a serpentine cut for engaging and retaining a guide sleeve for supporting the tool implement. Both collets are designed to engage and lock onto tool implements and guide sleeves at variable distances along their axial lengths.
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Estes Larry Dale
Gage Gary B.
Umber Ray E.
Bishop Steven C.
Bradley James E.
Felsman, Bradley, Vaden, Gunter & Dillon
Hunter Shawn
Medtronic Inc.
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