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Obesity Surgery

Surgical-hook-knife

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Surgical hook knife

Details

Inventors: Knoepfler, Dennis J.;
Assignee: NuSurg Medical, Inc. (Cincinnati, OH)
Primary Examiner: Pellegrino; Stephen C.
Assistant Examiner: Lewis; William W.
Attorney, Agent or Firm: Wood, Herron & Evans

A laparoscopic hook knife for use in surgical procedures includes an elongate shaft having a pistol grip handle at its proximal end and a blade support with a hook-shaped member at the distal end. The hook-shaped member has a blunt distal tip which is formed in the shape of a spade contained in a plane generally perpendicular to the plane containing the attached blade. An outlet is provided at the proximal end of the instrument for attaching a source of unipolar electric current for the purposes of creating hemostasis along the cutting path in the tissue. The shaft and blade support, except for the spade tip and at least one contact point between the blade and the blade support, are coated with an electrically insulating material to prevent any undesirable conduction of electricity. A second embodiment includes a blade member having an outer, straight cutting edge and an inner, curved cutting edge. The blade member may be moved between first and second positions in which the straight cutting edge is exposed in the first position and the curved cutting edge is exposed in the second position.

DETAILED DESCRIPTION To these ends, a first embodiment of the present invention provides an instrument having an elongate shaft with a pistol grip handle attached at its proximal end and a blade support on its distal end.
The blade support corresponds in shape to a hook-shaped blade member which is removably attachable to the blade support.
The blade support includes a distal hook member having a blunt tip.
The blunt tip is preferably shaped in the form of a spade which lies in a plane generally perpendicular to the plane of an attached blade member.
As previously mentioned, the blade member has a hook-shaped distal end that generally follows the shape of the distal hook member of the blade support.
A cutting edge is formed along the inside curved edge of the hook-shaped distal end of the blade member.
When properly attached to the blade support, the curved cutting edge of the blade member will be positioned proximally of the inside edge of the distal hook member.
Also, the outer tip of the blade member will lie inside or distally of the end of the spade-shaped tip.
The instrument includes an outlet for connecting a supply of unipolar electric current to the instrument to be supplied to the blade member for the purposes of causing hemostasis to occur along the cutting path.
The outlet preferably is formed as an electrically conductive pin extending upwardly from the handle.
The pin is connected to the shaft which is also preferably formed from an electrically conductive material, such as stainless steel, so as to conduct current to the blade member.
The shaft and blade support of the instrument are preferably coated with an electrically insulating material to prevent unwanted conduction of electric current to the patient, physician or surrounding environment.
A second embodiment of the invention provides an instrument including an elongated shaft having a hook-shaped distal end similar to that of the first embodiment but including a blade support having opposed blade support surfaces for supporting opposite sides of the blade

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