US4600005A — Guided osteotome for harvesting cranial bone graft

Claim 1

Independent Claim 148 words

A guided osteotome for use in the harvesting of cranial bone graft material for use in craniofacial plastic surgery, comprising: a. an instrument body; b. blade means on the instrument body including a cutting edge for cutting through layer of selected bone tissue suitable for grafing; c. the blade means including a generally flattened portion adjacent the cutting edge; d. guide means for defining the depth of a cut of the cutting edge and including a pair of spaced apart guides, each respectively having a bearing surface which tracks upon the skull during a bone graft harvesting operation when the cutting edge is generally parallel to the surface of the patient's skull, and a transverse surface extends angularly between each bearing surface and the cutting edge; and e. the blade and guide means being an integral unit which defines a recess through which harvested graft material can pass.

Claim 2

Dependent Claim 148 words

A guided osteotome for use in the harvesting of cranial bone graft material for use in craniofacial plastic surgery, comprising: a. an instrument body; b. blade means on the instrument body including a cutting edge for cutting through layer of selected bone tissue suitable for grafing; c. the blade means including a generally flattened portion adjacent the cutting edge; d. guide means for defining the depth of a cut of the cutting edge and including a pair of spaced apart guides, each respectively having a bearing surface which tracks upon the skull during a bone graft harvesting operation when the cutting edge is generally parallel to the surface of the patient's skull, and a transverse surface extends angularly between each bearing surface and the cutting edge; and e. the blade and guide means being an integral unit which defines a recess through which harvested graft material can pass.

Claim 3

Dependent Claim 24 words

The guided osteotome of claim 1 wherein there are two spaced apart guide means disposed generally on opposite edge portions of the blade means.

Claim 4

Dependent Claim 118 words

A guided osteotome for use in harvesting cranial bone graft material to be used in craniofacial plastic surgery, comprising: a. an instrument body; b. blade means carried by the instrument body and including a laterally extending cutting edge; c. a pair of guide means carried by the instrument body and including surface means, positioned laterally on the side of the blade means, which tract upon the patient's cranium for defining the depth of cut of the blade means so that the blade means does not completely penetrate the cranium and contact underlying brain tissue; and d. the guide means and blade means being an integral unit which forms a recess through which harvested bone graft material can pass.

Claim 5

Dependent Claim 118 words

A guided osteotome for use in harvesting cranial bone graft material to be used in craniofacial plastic surgery, comprising: a. an instrument body; b. blade means carried by the instrument body and including a laterally extending cutting edge; c. a pair of guide means carried by the instrument body and including surface means, positioned laterally on the side of the blade means, which tract upon the patient's cranium for defining the depth of cut of the blade means so that the blade means does not completely penetrate the cranium and contact underlying brain tissue; and d. the guide means and blade means being an integral unit which forms a recess through which harvested bone graft material can pass.

Claim 6

Dependent Claim 16 words

The guided osteotome of claim 1 wherein the first surface projects forwardly of the cutting edge.

Claim 7

Dependent Claim 22 words

The guided osteotome of claim 1 wherein the guide means includes one or more projections which extend forwardly of the cutting edge.

Claim 8

Dependent Claim 13 words

The guided osteotome of claim 5 wherein the projections are rounded in cross-section.

Claim 9

Dependent Claim 25 words

The guided osteotome of claim 1 wherein the blade means includes a curved cutting edge that generally corresponds to the curvature of the patient's skull.

Claim 10

Dependent Claim 19 words

The guided osteotome of claim 7 wherein the blade means has a radius of curvature of seven (7) centimeters.

Claim 11

Dependent Claim 52 words

The guided osteotome of claim 1 wherein the guide means includes a pair of skids which are positioned on each side of the blade cutting edge and connected thereto respectively by a pair of generally vertical webs which each extend respectively between the blade means at the cutting edge and the skids.

Claim 12

Dependent Claim 151 words

A guided osteotome for harvesting uniform layers of bone tissue from the skull of a patient, comprising: a. a handle handing an impact receiptive head that can be hammered; b. a shaft extending from the handle; c. a blade projecting from the shaft and including at its free end, a cutting edge; d. a pair of spaced apart bearing surface means positioned at the side portions of the blade which register upon the skull of the patient during the harvesting of bone graft material from the patient's skull for defining a preselected uniform depth of cut for the blade as the blade is forced along and through the outer table of the skull; and e. a pair of generally vertical web means extending respectively between the bearing surface means and the blade and being an integral unit therewith, defining a recess with the blade through which harvested graft material can pass.

Claim 13

Dependent Claim 151 words

A guided osteotome for harvesting uniform layers of bone tissue from the skull of a patient, comprising: a. a handle handing an impact receiptive head that can be hammered; b. a shaft extending from the handle; c. a blade projecting from the shaft and including at its free end, a cutting edge; d. a pair of spaced apart bearing surface means positioned at the side portions of the blade which register upon the skull of the patient during the harvesting of bone graft material from the patient's skull for defining a preselected uniform depth of cut for the blade as the blade is forced along and through the outer table of the skull; and e. a pair of generally vertical web means extending respectively between the bearing surface means and the blade and being an integral unit therewith, defining a recess with the blade through which harvested graft material can pass.

Claim 14

Dependent Claim 60 words

The guided osteotome of claim 10 wherein the blade includes a generally flat distal end portion having a cutting edge which traverses a cut projection and the bearing surface includes one or more generally flat surfaced guides having one or more surfaces which occupy a plane that is generally parallel to a cut projection traversed by the blade distal end.

Claim 15

Dependent Claim 21 words

The guided osteotome of claim 10 wherein the cutting edge has a lateral curvature that generally corresponds to the skull curvature.

Claim 16

Dependent Claim 22 words

The guided osteotome of claim 12 wherein the bearing surface means includes a pair of guides that are joined to the blade.

Claim 17

Dependent Claim 26 words

The guided osteotome of claim 13 wherein each guide includes interior and exterior vertical surfaces which intersect respectively the upper and lower surfaces of the blade.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-07-14	1990-01-13	1990-07-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-07-14	1994-01-13	1994-07-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-07-14	1998-01-13	1998-07-15	$7700.00	Window Closed / Lapsed

Guided osteotome for harvesting cranial bone graft

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