Extraction screwdriver
First Claim
1. A tool comprising:
- a drive shaft having proximal and distal ends, an intermediate portion, an outer sleeve engaging portion and a length;
a handle portion associated with the drive shaft proximal end, a fastener engaging portion associated with the drive shaft distal end, the fastener engaging portion comprising a first surface configured to axially engage a fastener and a second surface configured to rotationally engage the fastener; and
an outer sleeve associated with the drive shaft intermediate portion, the sleeve comprising a drive shaft engaging portion, wherein the outer sleeve engaging portion and the drive shaft engaging portion are configured to coact to allow at least a portion of the drive shaft to translate linearly within the sleeve.
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Accused Products
Abstract
The present invention provides a simplified bone fastener removal tool which allows the surgeon to remove bone screws or other bone fasteners from bone, and from bone plates incorporating fastener locking elements. The tool includes an inner shaft which axially engages the bone fastener, a drive shaft which allows the fastener to be rotated using the tool, and an internally threaded outer sleeve which, in combination with the drive shaft, allows for a controlled removal of the fastener from the bone plate and bone. In particular, the internal threads of the outer sleeve engage external threads on the drive shaft, such that rotating the drive shaft while maintaining the outer sleeve fixed causes the drive shaft to translate with respect to the sleeve. Thus, when a fastener is axially engaged with the drive shaft, a controlled removal of the fastener from the bone and bone plate is accomplished simply by rotating the drive shaft with respect to the outer sleeve. No pulling on the fastener is necessary. A method of using the tool is also provided.
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Citations
42 Claims
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1. A tool comprising:
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a drive shaft having proximal and distal ends, an intermediate portion, an outer sleeve engaging portion and a length;
a handle portion associated with the drive shaft proximal end, a fastener engaging portion associated with the drive shaft distal end, the fastener engaging portion comprising a first surface configured to axially engage a fastener and a second surface configured to rotationally engage the fastener; and
an outer sleeve associated with the drive shaft intermediate portion, the sleeve comprising a drive shaft engaging portion, wherein the outer sleeve engaging portion and the drive shaft engaging portion are configured to coact to allow at least a portion of the drive shaft to translate linearly within the sleeve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A tool comprising
a drive shaft having a fastener engaging end and a sleeve engaging portion, the fastener engaging end comprising a rotational engagement portion and an axial engagement portion, a sleeve disposed about at least a portion of the drive shaft, the sleeve comprising a drive shaft engaging portion, wherein the sleeve engaging portion and the drive shaft engaging portion comprise complementary threads configured to allow the drive shaft to translate linearly within the sleeve when the drive shaft is rotated relative to the sleeve.
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39. A method of removing a fastener from a bone and/or plate comprising the steps of:
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(a) providing a tool having an inner shaft portion, a cannulated drive shaft portion and a sleeve portion, the cannulated drive shaft portion at least partially disposed within the sleeve portion and the inner shaft portion at least partially disposed within the cannulated drive shaft portion;
(b) inserting a portion of the drive shaft portion into the head of a bone fastener;
(c) axially engaging the inner shaft portion with the bone fastener, the fastener engaged with a bone portion, the fastener further disposed within the bone screw hole of a bone plate;
(d) rotationally engaging the inner shaft portion with the bone fastener;
(e) engaging one end of the sleeve portion with a surface of the bone plate; and
(f) moving the drive shaft and outer sleeve portions with respect to each other to remove the fastener from the bone. - View Dependent Claims (40, 41, 42)
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Specification