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Gastric pseudocyst drainage and stent delivery system for use therein
| Details |
Inventors: Stinson, Jonathan S.; Richardson, M. Kevin;
Assignee: SciMed Life Systems, Inc. (Maple Grove, MN)
Primary Examiner: Look; Edward K.
Assistant Examiner: Fristoe, Jr.; John K
Attorney, Agent or Firm: Kriegsman & Kriegsman
Method for draining pseudocysts and stent delivery system for use therein. In one embodiment, the system comprises an inner catheter provided with a pair of longitudinal lumens. A guide wire is slidably disposed in one lumen, and a retractable needle is slidably disposed in the other lumen. A self-expandable stent is coaxially mounted around the inner catheter near its distal end, and an outer catheter is coaxially mounted around the inner catheter and the stent, the outer catheter being adapted for axial movement relative to the inner catheter and being dimensioned to maintain the stent in a compressed state. In use, an endoscope is intraorally introduced into a patient's stomach, and the distal end of the system is inserted therethrough. The needle is advanced to form perforations in the stomach and pseudocyst. The inner catheter is then inserted through the perforations, and the outer catheter is retracted, allowing the stent to expand and interconnect the stomach and pseudocyst. The endoscope and the rest of the delivery system are then withdrawn from the patient. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a novel technique for draining gastric pseudocysts.
It is another object of the present invention to provide a technique as described above that overcomes at least some of the above-described shortcomings associated with existing techniques for draining gastric pseudocysts.
Therefore, in furtherance of the above and other objects to be described or to become apparent from the description below, there is provided herein a method of draining a pseudocyst present within a patient, said method comprising, according to one aspect, the steps of (a) providing a stent, said stent being transformable from a non-expanded state of comparatively lesser diameter to an expanded state of comparatively greater diameter, said stent having a first end and a second end; (b) delivering said stent in said non-expanded state to a pseudocyst located within a patient; (c) inserting said first end of said stent into the pseudocyst; and (d) transforming said stent from said non-expanded state to said expanded state; (e) whereby the pseudocyst drains through said stent.
Preferably, the aforementioned method further comprises the steps of inserting said second end of said stent into the stomach of the patient whereby the pseudocyst drains through said stent into the stomach and, prior to said first end and second end inserting steps, forming a perforation in each of the pseudocyst and the stomach, wherein said first end inserting step comprises inserting said first end of said stent through said perforations in the pseudocyst and the stomach.
Moreover, the stent is preferably introduced into the stomach of the patient intraorally.
The above-described stent may be a self-expandable stent or may be a balloon-expandable stent.
In the case of a self-expandable stent, said delivering step comprises maintaining said stent in said non-expanded state using a removable restraint, and said transforming step comprises removing said removable restraint from said stent to allow said stent to self-expand
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Heart Surgery 
