Surgical instrument and method of making same

• US 4,598,710 A
• Filed: 01/20/1984
• Issued: 07/08/1986
• Est. Priority Date: 01/20/1984
• Status: Expired due to Term

• Current Assignee: Urban Engineering Company Incorporated
• Original Assignee: Urban Engineering Company Incorporated
• Inventors: Kleinberg, Larry K., Evans, Donald S.
• Primary Examiner(s): Niebling, John F.
• Assistant Examiner(s): Chapman, Terryence
• Application Number:
  US06/572,236
• Time in Patent Office: 900 Days
• Field of Search: 128/304, 128/305, 128/276, 128/307, 128/309, 128/312, 128/751-755, 128/757, 128/758, 128/318, 30/290
• US Class Current: 606/170
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing

Abstract

A surgical instrument comprising a pair of co-axially assembled tubes having their distal walls in bearing relationship and with registrable openings extending through such distal end and annular walls correspondingly joined to their respective distal walls. The inner tube reversibly rotates within its matched outer tube in operation of the invention, as action by cutting edges formed about such openings severs tissue drawn into the inner tube by suction. Each distal end wall includes a pair of circular cutting edges, those in the inner tube having a straight cut across its thickness while those in the outer tube have a full radiused cut across its thickness. Full radiused cuts across the thicknesses of the annular walls of the inner and outer tubes are provided for arcuately-formed and parallel cutting edges forming the respective openings in these tubes in their annular walls. A method to form these openings by means of these cutting edges is disclosed.

Claims

1. A surgical instrument cutting tube comprising

a body formation forming an opening extending into a distal end wall having an interior surface and into an annular wall forming said tube,

a bearing surface included in the interior surface of said distal end wall and about the axis of said tube,

the body formation for the opening in said distal end wall comprising a pair of circularly-formed radiused-cut cutting edges having contiguous extemities joined together at a protrusion of said bearing surface between the tube'"'"'s axis and the opening in said annular wall,

the body formation for the opening in said annular wall comprising a pair of spaced parallel radiused-cut cutting edges longitudinally disposed in said annular wall,

said circularly-formed radiused-cut cutting edges having opposing extremities correspondingly joining said spaced parallel radiused-cut cutting edges at corresponding non-sharp junctures of said distal end and annular walls.

2. The tube of claim 1 including radiused-cut cornered edges correspondingly joining said spaced parallel radiused-cut cutting edges adjacent the end of the length of the opening in said annular wall.

3. A surgical instrument cutting tube comprising

a body formation forming an opening extending into a distal end wall having an exterior surface and into an annular wall forming said tube,

a bearing surface included in the exterior surface of said distal end wall and about the axis of said tube,

the body formation for the opening in said distal end wall comprising a pair of circularly-formed straight cut cutting edges having their contiguous extremities joined together at a protrusion of said bearing surface between the tube'"'"'s axis and the opening in said annular wall,

the body formation for the opening in said annular wall comprising a pair of spaced arcuately-formed radiused-cut cutting edges,

said circularly-formed straight cut cutting edges having opposing extremities correspondingly joining said spaced arcuately-formed radiused-cut cutting edges at corresponding sharp junctures of said distal end and annular walls.

4. The tube of claim 3 including an edge circumferentially disposed and flowing into corresponding arcuately-formed radiused-cut cutting edges therein.

5. A surgical instrument comprising

co-axially assembled inner and outer tubes each having an axis,

a body formation in each of said tubes forming an opening extending into a distal end wall and into an annular wall forming each of said tubes,

bearing surfaces included in the distal end walls of said tubes and engaging each other and including corresponding bearing protrusions between their respective axes and respective openings in their annular walls when the opening in one tube registers with the opening in the other tube,

the body formation about the opening in the outer tubes'"'"'s distal end wall comprising a pair of circularly-formed radiused cut cutting edges having contiguous extremities joined together at its corresponding bearing protrusion,

the body formation about the opening in the outer tube'"'"'s annular wall comprising a pair of spaced parallel radiused-cut cutting edges longitudinally disposed in its annular wall,

said circularly-formed radiused-cut cutting edges having opposing extremities correspondingly joining said parallel radiused-cut cutting edges at a corresponding non-sharp juncture of said distal end and annular walls,

the body formation for the opening in the inner tube'"'"'s distal end wall comprising a pair of circularly-formed straight cut cutting edges having their contiguous extremities joined together at its corresponding bearing protrusion,

the body formation for the opening in the inner tube'"'"'s annular wall comprising a pair of spaced arcuately-formed radiused-cut cutting edges,

the inner tube'"'"'s circularly-formed straight cut cutting edges having opposing extremities correspondingly joining its arcuately-formed radiused-cut cutting edges at a sharp juncture of said distal end and annular wall.

6. The surgical instrument of claim 5 including

an edge circumferentially disposed and flowing into corresponding arcuately-formed radiused-cut cutting edges in said inner tube, and

radiused-cut cornered edges correspondingly joining said spaced parallel radiused-cut cutting edges in said outer tube at the end of the length of its opening in its annular wall,

said circumferentially disposed edge being beyond the end of the length of the outer tube'"'"'s opening in its annular wall.