Patent EP0465158A2 successfully refreshed from Google Patents.
EP0465158A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for use in the treatment of spinal disorders
Assignee: Individual
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Filing: 1991-06-28
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Granted: —
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Expires: 2011-06-28
Abstract
Abstract An implant (10) for use in fixing one segment of a spinal column to another segment thereof by means of at least one rod member, comprises a screw member (11) for insertion in the pedicle of a segment of a spinal column and having an enlarged diameter head (13) with an open ended transverse slot (16) to receive a fixing rod member (20), and clamp means having a screw threaded connection with the head (13) of the screw member (11) and having a clamping portion fitting around the outside of the head (13) of the screw member (11) for engaging a fixing rod member (20) inserted in the transverse slot (16) of the screw member (11) and clamping it therein. The clamp means comprises a collar (14) around a reduced diameter portion (19) of the head (13) and a clamping screw (15) having a threaded shank (18) inserted in a threaded counterbore (17) in the head (13) and having a flanged head (22) for engagement with the collar (14). The axial length of the shank (18) is less than the axial length of the collar (14) whereby a rod member (20) can be clamped by the collar (14) without being engaged by the shank (18). Ancillary instruments for use with the implant system include a centre punch (40) for locating a hole to be drilled in a pedicle for insertion of a screw member (11), and a screw driver (50) for holding and inserting a screw member (11) into a drilled hole in a pedicle.
Inventors
- 👤 Seyed Mohammad Hossein Mehdian
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1671; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7032; A61B17/7074; A61B17/7076; A61B17/7082; A61B17/1604
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
An implant system (10) for use in fixing one segment of a spinal column relatively to another segment thereof by means of at least one fixing rod member in the treatment of spinal disorders, comprising a screw member (11) for insertion in the pedicle of a segment of a spinal column and having an enlarged diameter head (13) with an open ended transverse slot (16) to receive a fixing rod member (20), and clamp means having a screw threaded connection with the head (13) of the screw member (11) and having a clamping portion fitting around the outside of the head (13) of the screw member (11) for engaging a fixing rod member (20) inserted in the transverse slot (16) in the head of the screw member (11) and clamping it therein.
Claim 2
Dependent Claim
55 words
An implant system as claimed in claim 1, in which the screw threaded connection between the head (13) of the screw member (11) and the clamp means comprises an internally screw threaded counter bore (17) in the head (13) of the screw member (11) and an externally screw threaded shank (18) in the clamp means.
Claim 3
Dependent Claim
25 words
An implant system as claimed in claim 2, in which the clamping portion comprises a skirt concentric with the shank (18) of a clamping screw.
Claim 4
Dependent Claim
97 words
An implant system as claimed in claim 2, in which the clamp means comprises a collar (14) which can be slipped over the outside of the head (13) of the screw member (11) to engage a fixing rod member (20) inserted in the transverse slot (16) in the head of the screw member (11) and serve as the clamping portion, and a clamping screw (15) having a screw threaded shank (18) for insertion into the screw threaded counterbore (17) in the head of the screw member (11) and a flanged head (22) for engagement with the collar.
Claim 5
Dependent Claim
65 words
An implant system as claimed in claim 4, in which the axial length of the shank (18) of the clamping screw (15) is less than the axial length of the collar (14) whereby a fixing rod member (20) can be clamped in the transverse slot (16) by the collar (14) without being engaged by the end of the shank (18) of the clamping screw (15).
Claim 6
Dependent Claim
43 words
An implant system as claimed in claim 4 or 5, in which the head of the screw member (11) has a reduced diameter portion (19) adjoining the open end of the transverse slot (16) and counterbore (17) over which the collar is slipped.
Claim 7
Dependent Claim
36 words
An implant system as claimed in claim 6, in which the head of the screw member (11), the collar (14), and the flanged head (22) of the clamping screw (15) have substantially the same external diameter.
Claim 8
Dependent Claim
37 words
An implant system as claimed in claim 4, 5, 6 or 7, in which the flanged head (22) of the clamping screw (15) has a hexagonal socket (21) for engagement with a hexagonal ended driver or key.
Claim 9
Dependent Claim
38 words
An implant system as claimed in claim 8, characterised in that the hexagonal socket (21) is screw threaded to receive therein a locking screw (24) adapted to engage said rod member (20) to provide further clamping action thereon.
Claim 10
Dependent Claim
53 words
An implant system as claimed in claim 1, in which the screw threaded connection between the head (13) of the screw member (11) and the clamp means comprises an external screw thread on said head (13) and an internal screw thread on a skirt serving as said clamping portion of the clamp means.
Claim 11
Dependent Claim
66 words
An implant system as claimed in any preceding claim in combination with one or more ancillary instruments adapted to promote the location of a hole to be drilled in a pedicle of a segment of a spinal column for insertion of a screw member, and a screw driver for securely holding a screw member and promoting the operation of screwing it into a hole so drilled.
Claim 12
Dependent Claim
51 words
An ancillary instrument adapted for use with an implant system as claimed in any of claims 1 to 10, in the form of a centre punch (40) for locating a hole to be drilled in a pedicle of a segment of a spinal column for insertion of a screw member (11).
Claim 13
Dependent Claim
129 words
An ancillary instrument as claimed in claim 12, in which the centre punch (40) comprises a punch member (41) extending through a tubular handle (43) and attached to an anvil end (42) thereof, a tube member (47) telescopically mounted in the tubular handle (43) and surrounding the punch member (41), and a spring member (45) acting between the anvil end (42) of the tubular handle (43) and the tube member (47), the outer open end of the tube member being shaped (48) to enable it to be located in a desired position on a pedicle of a segment of a spinal column prior to the application of pressure to the anvil end (42) of the tubular handle (43) to bring the punch member (41) into engagement with the pedicle.
Claim 14
Dependent Claim
184 words
An ancillary instrument adapted for use with an implant system as claimed in any of claims 1 to 10, in the form of a screw driver (50) comprising a tubular handle (51,52) having at one open end a transversely extending pin (53) adapted to be received in a slot (16) in the head (13) of a screw member (11) inserted in said open end, and a rod (54) extending inside the tubular handle (51,52) and having in the region of said open end a screw threaded portion (53) adapted to make screw threaded connection with the head (13) of a screw member (11) inserted in said open end and in the region of the opposite end of the tubular handle (51,52) means for restraining axial movement of the rod (54) towards said open end of the tubular handle (51,52) and rotating the rod (54) relative to the tubular handle (51,52) whereby a screw member (11) inserted in said open end can be securely held therein for insertion into and screwing into a hole drilled in a pedicle of a segment of a spinal column.
Claim 15
Dependent Claim
35 words
An ancillary instrument as claimed in claim 14, in which said restraining and rotating means is a knob (56) affixed to the rod (54) which can abut said opposite end of the tubular handle (51,52).
References Cited (Backward Citations)
No citation records indexed.
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