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Surgical retrieval assembly and associated method
| Details |
Inventors: Nakao, Naomi L.; Wilk, Peter J.;
Assignee: Wilk & Nakao Medical Technology, Incorporated (New York, NY)
Primary Examiner: Hafer; Robert A.
Assistant Examiner: Yu; Justine R.
Attorney, Agent or Firm: Sudol; R. Neil, Coleman; Henry D.
A method for removing a polyp from a patient utilizes (i) a flexible conductive cauterization loop and (ii) a flexible auxiliary loop to which a flexible web member is connected to define an expandable pocket, the cauterization loop and the auxiliary loop being disposed in a common tubular member. Upon insertion of an endoscope assembly into a patient and a locating of the polyp, the tubular member is moved through the biopsy channel of the endoscope to eject a distal end portion of the tubular member from the biopsy channel. The cauterization loop is then shifted in a distal direction relative to the ejected tubular member to eject the cauterization loop from the tubular member. The cauterization loop is manipulated from outside of the patient to pass the loop over the polyp and to at least partially close the loop to engage the polyp around a base region thereof. Upon a subsequent conducting of an electrical current through the cauterization loop to burn through the polyp at the base region, thereby severing the polyp at the base region, the cauterization loop is retracted into the tubular member and the auxiliary loop is ejected and maneuvered to enclose the severed polyp in the capture pocket. The auxiliary loop is at least partially closed to capture the severed internal body tissues in the pocket. The captured polyp is removed in the pocket from the patient. |
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DETAILED DESCRIPTION As illustrated in FIG.
1A, a snare cauterization instrument assembly comprises a hand held control module 20, a flexible tubular member 22 connected to a distal end of the control module, and an alternately expandable and closable cauterization loop 24 at the distal tip of the flexible tubular member 22.
A flexible sheet or web 26 specifically in the form of a net is attached to cauterization loop 24 for defining a capture pocket.
Loop 24 defines the mouth of the capture pocket.
Control module 20 comprises a body member or frame 28 which includes a pair of parallel rails 30a and 30b to which a slider member 32 is reciprocatably secured.
Frame 28 has a thumb hole 31 at a proximal end, whereas slider member 32 has a pair of finger holes 34a and 34b and is fastened to the proximal end of a wire 36 which passes through tubular member 22 and is in turn connected to cauterization loop 24 at the distal end of tubular member 22.
Wire 36 is sufficiently flexible to bend with tubular member 22 during the negotiation thereby of curves or bends in a colon during surgery.
Slider member 32 is also provided with an electrical connector 38 which is couplable to a source of electrical energy.
During a severing step of a cauterization operation, described in detail hereinafter with reference to FIG.
2E, electrical energy is fed to loop 24 via connector 38 and wire 36.
Capture web 26 is thin and flexible and preferably made of biologically inert flexible transparent synthetic resin or polymeric material such as polyethylene or nylon.
Prior to the beginning of a snare cauterization operation, web 26 is disposed in a closed, folded or contracted state, together with loop 24, in the distal end of tubular member 22, as illustrated in FIG.
1B.
Concomitantly, slider member 32 is retracted to the proximal end of rails 30a and 30b (towards the right side of frame 28 in FIG.
1A).
Tubular member 22 is inserted in a biopsy channel 40 of an endoscope 42, as shown in FIG.
2A, and the endoscope is inserted into a body cavity of a patient, such as a colon C
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Heart Surgery 
