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US 5,507,765 AGranted
Punch-type surgical instrument for skin incision, set of parts for making such an instrument of selectably variable size, and blade unit for such instrument
OwnerJames B. Mottinventor
Life of this patent
Estimating the term…
Abstract
A punch-type surgical instrument for skin incision along a closed line, such as a substantially elliptical line, includes a handle, a blade unit and a means for attaching the handle to the blade unit in a way achieving high stability between the handle and blade unit and which nevertheless allows the two parts to be made as ones easily connectable to and disconnectable from one another. The blade unit may be made and furnished in different sizes to cause the instrument to be one selectably variable in size.
Claims20
A punch-type surgical instrument for skin incision, said instrument comprising:
- a handle,
- a blade unit separate from said handle, and
- cooperating first connecting means on said handle and second connecting means on said blade unit for securing said handle to said blade unit,
- said blade unit including a tubular metallic blade surrounding an enclosed space, said blade having an annular lower portion defining an annular lower edge and also having an annular upper portion extending upwardly from said lower portion and defining an annular upper edge, said annular lower edge of said lower portion being sharpened for skin incising purposes,
- said blade unit also including a blade support member made of a plastic material fixed to said upper portion of said blade and having a cross portion extending across said enclosed space and located substantially in the plane of said upper edge of said tubular blade,
- said blade support member being fixed to said annular upper portion of said blade by said upper portion of said blade along its full annular extent being embedded in said plastic material of said blade support member, and
- said second connecting means being carried by and fixed relative to said cross portion of said blade support member so that as seen looking downwardly onto said blade unit said second connecting means is located at the middle of said cross portion of said blade support member and entirely within the space surrounded by said tubular blade.
4 more elements
A set of parts for making a punch-type surgical instrument of selectively variable size for skin incision, said set of parts comprising:
- a handle, and
- a plurality of blade units separate from said handle,
- each of said blade units including a tubular metallic blade surrounding an enclosed space, said blade having an annular lower portion defining an annular lower edge and also having an annular upper portion extending upwardly from said lower portion and defining an annular upper edge, said annular lower edge of said blade being sharpened for skin incision purposes, and a plastic blade support member fixed to said upper portion of said blade and having a cross portion extending across said enclosed space above said lower edge of said blade and located substantially in the plane of said upper edge of said tubular blade, said blade support member of each of said blade units being fixed to said annular upper portion of said blade by said upper portion of said along its full annular extent being embedded in said plastic material of said blade support member,
- said blades of said plurality of blade units being of different sizes,
- said handle including a first connecting means, and
- each of said blade units including a second connecting means on said cross portion of its blade support member which second connecting means is so positioned that as seen looking downwardly onto said blade unit said second connecting means is located at the middle of said cross portion of said blade support member and entirely within the space surrounded by said tubular blade, and which second connecting means is cooperable with said first connecting means of said handle to permit said blade unit to be manually attached to and removed from said handle, whereby a complete instrument for making an incision of a selected size may be obtained by selecting one of said blade units from said plurality of blade units and attaching it to said handle.
3 more elements
A blade unit for use with an associated handle having a first connecting means to form a punch-type surgical instrument for skin incision, said blade unit comprising:
- a tubular metallic blade having an annular lower portion defining an annular lower edge and also having an annular upper portion extending upwardly from said lower portion and defining an annular upper edge, said lower edge of said blade being sharpened for skin incision purposes, said tubular blade surrounding an enclosed space,
- a plastic blade support member fixed to said upper portion of said blade and having a cross portion extending across said enclosed space above said sharpened lower edge of said blade and located substantially in the plane of said upper edge of said tubular blade, and
- second connecting means carried by said cross portion of said blade support member for cooperation with said first connecting means of said handle to enable said blade unit to be manually attached to and removed from said handle, said second connecting means being so positioned on said cross portion that, as seen looking downwardly onto said blade unit, said second connecting means is located at the middle of said cross portion of said blade support member and entirely within the space surrounded by said tubular blade.
Dependencies are inferred from the claim text.