GB2093353A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
A surgical instrument for arthroscopic arthroplasty
Assignee: Smith and Nephew Inc
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Filing: 1982-02-24
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Granted: —
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Expires: 2002-02-24
Abstract
Abstract An orthopedic surgical instrument for arthroscopic arthroplasty of the joints of the body, for insertion into the joint through a puncture wound and capable of removing degenerated cartilage and bone over an extended surface area, to a limited depth, to expose blood supply and induce growth of fibrous secondary cartilage to regenerate an articular surface is a rotating, semi- shielded cartilage and bone abrading, suctioning instrument featuring an outer tubular sheath 20 attached to a support and within the sheath, an inner tubular shaft 24; at the distal end of the inner tubular shaft 24, partially shielded by the outer sheath, is an abrading element 44 that is rotated to present an abrading surface. At its proximal end, the inner tubular shaft is connected to a vacuum source for removal of tissue- carrying fluid and bone abraded from the joint surface. This fluid reaches the tubular shaft from the region of the abrading element via an inlet 21 and a passage 72 through an annular distal bearing 90 which supports the inner tubular shaft, the shaft being subject to transverse loading during bone- abrading engagement. Powered means are provided to rotate the inner tubular shaft relative to the outer sheath under bone-abrading load. <IMAGE>
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-22 19:30
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/313; A61B1/317; A61B1/04; A61B1/042; A61B17/00; A61B17/32; A61B17/320016; A61B17/32002
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
344 words
A surgical instrumcnt for removing bone at a load-bearing, articular surface of a joint, esp. a knee, of a living being to expose lower-lying bone tissue which has blood supply (is vascular), thereby to enable, under the influence of said blood supply, growth of fibrocartilage that can extend over said articular surface for improving articular function, comprising a rotary shaft being on its proximal end driven by a motor and having on its distal end an element, capable of progressively removing said bone by gradually reducing the bond to small particles, characterized in that an outer tubular sheath encloses said motor driven shaft and is sized to be inserted from the exterior through a puncture in the flesh of said living being into said joint to the situs of said articular surface and, under visual control via an arthroscope introduced via another puncture in the flesh, adapted to be operated within the joint, said power driven shaft comprises a hollow tubular shaft extending through said outer sheath and carrying at its distal end as said bone removing element an abrading element, having at least a side abrading surface for removing a thin layer of bone over an extended area of said loadbearing articular surface, said outer sheath is configured to expose a limited portion of said abrading surface, thereby to assist in limiting depth penetration of said abrading element into said articular surface and shielding said abrading element from contact with joint surfaces in other directions, said shaft being rotatably supported relative to said outer sheath by at least one hollow, annular distal bearing member to enable transverse loading of said abrading element, and having the inner hollow volume of the hollow tubular shaft communicating through the bearing with a fluid opening, located distally of said bearing member and communicating with the region of operation of said abrading element, and being with its proximal end connectable to a vacuum source, thereby enabling fluid with suspended abraded material to be withdrawn front said region of operation through said opening and through said driven tubular shaft.
Claim 2
Dependent Claim
344 words
A surgical instrumcnt for removing bone at a load-bearing, articular surface of a joint, esp. a knee, of a living being to expose lower-lying bone tissue which has blood supply (is vascular), thereby to enable, under the influence of said blood supply, growth of fibrocartilage that can extend over said articular surface for improving articular function, comprising a rotary shaft being on its proximal end driven by a motor and having on its distal end an element, capable of progressively removing said bone by gradually reducing the bond to small particles, characterized in that an outer tubular sheath encloses said motor driven shaft and is sized to be inserted from the exterior through a puncture in the flesh of said living being into said joint to the situs of said articular surface and, under visual control via an arthroscope introduced via another puncture in the flesh, adapted to be operated within the joint, said power driven shaft comprises a hollow tubular shaft extending through said outer sheath and carrying at its distal end as said bone removing element an abrading element, having at least a side abrading surface for removing a thin layer of bone over an extended area of said loadbearing articular surface, said outer sheath is configured to expose a limited portion of said abrading surface, thereby to assist in limiting depth penetration of said abrading element into said articular surface and shielding said abrading element from contact with joint surfaces in other directions, said shaft being rotatably supported relative to said outer sheath by at least one hollow, annular distal bearing member to enable transverse loading of said abrading element, and having the inner hollow volume of the hollow tubular shaft communicating through the bearing with a fluid opening, located distally of said bearing member and communicating with the region of operation of said abrading element, and being with its proximal end connectable to a vacuum source, thereby enabling fluid with suspended abraded material to be withdrawn front said region of operation through said opening and through said driven tubular shaft.
Claim 3
Dependent Claim
23 words
The surgical instrument of claim 1 characterized in that said inner tubular shaft is supported by spaced apart distal and proximal bearing surfaces.
Claim 4
Dependent Claim
31 words
The surgical instrument of claim 1 or 2 characterized in that a said bearing member is an annular surface extending radially and rotable with the surface of said inner tubular shaft.
Claim 5
Dependent Claim
73 words
The surgical instrument of claim 1 characterized in that the distal portion of said outer tubular sheath is progressively relieved along one side to progressively expose from one side the abrading surface of said abrading element, the distal end of said outer tubular sheath is terminated proximally of the end surface of said abrading element, the exposed side of said abrading element being substantially aligned with the tubular wall of said outer sheath.
Claim 6
Dependent Claim
38 words
The surgical instrument of claim 4 characterized in that said outer sheath is progressively relieved along a line which lies in a plane disposed at an angle of 300 or less to the axis of said tubular sheath.
Claim 7
Dependent Claim
54 words
The surgical instrument of claim 1 characterized in that said instrument is adapted to be connected to an external vacuum source and said internal tubular shaft is capable of removing fluid carrying abraded tissue and bone from said joint at a flow rate of the order of at least 100 cubic centimeters per minute.
Claim 8
Dependent Claim
36 words
The surgical instrument of claim 1 characterized in that said abrading element is formed at one end of a drive spur, said drive spur removably carried axially at the distal end of said inner tubular shaft.
Claim 9
Dependent Claim
134 words
The surgical instrument of claim 7
characterized in that the distal end of said inner
tubular shaft is a chuck member, said chuck
member being hollow, and said chuck member
having receiving means to axially receive, and
fixably retain the drive spur of said abrading
element during engagement with said joint
surface; said distal bearing extending annularly
from the external wall of said chuck member
proximally of said receiving means; and an
opening through the annular wall of said chuck
member, said opening located proximally of said
receiving means and distally of said bearing
member, and said chuck member acting as a
conduit for fluid carrying abraded tissue from said
opening through said distal bearing, and said
chuck member conduit connected to said internal
tubular shaft conduit to carry said fluid from the
body.
Claim 10
Dependent Claim
46 words
The surgical instrument of claim 8
characterized in that said inner tubular shaft has
locking means, said locking means adapted to
receive the distal end of said abrading element
drive spur in a secure relationship, said
relationship preventing dislodgement of said drive
spur during surgical maneuvering.
Claim 11
Dependent Claim
22 words
The surgical instrument of claim 8
characterized in that said abrading element and
said drive spur are formed as a single unit.
Claim 12
Dependent Claim
38 words
The surgical instrunlent of claim 1
characterized in that said outer tubular sheath is of
about 50 mm length or longer, and said outer diameter of said outer sheath is of the order of 4 mm or larger.
Claim 13
Dependent Claim
39 words
The surgical instrumerit of claim 1
characterized in that said means to rotate-said
inner tubular shaft is adapted to rotate said shaft
at a speed of the order of between 500 rpm to 3000 rpm under normal bone-abrading load.
Claim 14
Dependent Claim
42 words
The surgical instrument of claim 1 characterized in that said means to rotate said inner tubular shaft is reversible under the control of the surgeon, said abrading element adapted to abrade less aggressively in the reverse direction than in the forward direction.
Claim 15
Dependent Claim
30 words
The surgical instrument of claim 1 characterized in that said outer sheath is configured to expose a limited portion of one side of the abrading element for said abrading action.
Claim 16
Dependent Claim
33 words
The surgical instrument of claim 1 or claim 14 characterized in that said outer sheath is configured to expose a limited portion of the end of the abrading element for said abrading action.
Claim 17
Dependent Claim
122 words
1 6. A surgical instrument for arthroscopic surgery removal of selected portions of bone from a joint, which apparatus comprise a rotary shaft, a tubular member housing the shaft, an abrading tool mounted for rotation at a distal end of the shaft, drive means connected to rotate the shaft and tool, at least one bearing member located adjacent the distal end of the shaft and supporting the shaft for rotation in the housing against side loads, a passageway for fluid from adjacent the distal end of the shaft up through the housing, and means for drawing fluid through said passageway, whereas the abrading tool partially shielded by the housing and is exposed for abrading action at least at a side surface thereof.
Claim 18
Dependent Claim
122 words
1 6. A surgical instrument for arthroscopic surgery removal of selected portions of bone from a joint, which apparatus comprise a rotary shaft, a tubular member housing the shaft, an abrading tool mounted for rotation at a distal end of the shaft, drive means connected to rotate the shaft and tool, at least one bearing member located adjacent the distal end of the shaft and supporting the shaft for rotation in the housing against side loads, a passageway for fluid from adjacent the distal end of the shaft up through the housing, and means for drawing fluid through said passageway, whereas the abrading tool partially shielded by the housing and is exposed for abrading action at least at a side surface thereof.
Claim 19
Dependent Claim
17 words
A surgical instrument substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Claim 20
Dependent Claim
17 words
A surgical instrument substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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