Appliance collapsible for insertion into a human organ and capable of resilient restoration
First Claim
1. An appliance to be implanted wherein a plurality of elastically foldable wire rings arranged spaced apart from each other are interconnected by a tubular cover formed with a flexible, tensile sheet and characterized by that said tubular cover is woven with warps along the axial direction of the appliance to be implanted and wefts along the circumferential direction thereof, wherein said warps are of mono-filament of polyester capable of keeping its shape and the wefts are of multi-filaments of polyester having a closeness imparting waterproofness to the sheet.
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Accused Products
Abstract
An artificial blood vessel A comprises a pair of discrete end wire rings 101, 102, a tubular cover 7 made of a sheet of flexible, tensile material which connects the end wire rings 101, 102, and a plurality of intermediate wire rings 12 arranged spaced apart between the end wire rings 101, 102 and circumferentially fixed to the cover 7 by suturing or with adhesive. All of the rings are located on the outside of the cover. To implant the vessel A via a catheter, a plurality of dividing points 411, 431 which bisect the circumference of the front end wire ring 101 are pulled forward while the movement of the midpoints 421, 441 between the dividing points 411, 431 following the movement of the dividing points 411, 431 is restrained by the projections 18c on a tapered surface 18d of a funneled tube 18 so as to fold the front end wire ring 101 into a wavy shape, with the dividing points 411, 431 forming forwardly directed peaks and the midpoints 421, 441 forming the bottoms of forwardly directed valleys. The dividing points of the front wire ring are pulled farther forward so as to fold the intermediate wire rings 12 and the rear end wire ring 102 into a regular wavy shape having the same phase as that of the front wire ring 101 by the effect of restraint by the tapered surface 18d and the projections 18c, thereby to collapse the artificial blood vessel A as a whole into a small size for passage through the catheter. Upon release of the artificial vessel from the catheter at the affected portion of the blood vessel, the artificial vessel is restored to its original shape. The end wire rings, the cover, and the intermediate wire rings alone keep the shape of the artificial vessel.
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Citations
32 Claims
- 1. An appliance to be implanted wherein a plurality of elastically foldable wire rings arranged spaced apart from each other are interconnected by a tubular cover formed with a flexible, tensile sheet and characterized by that said tubular cover is woven with warps along the axial direction of the appliance to be implanted and wefts along the circumferential direction thereof, wherein said warps are of mono-filament of polyester capable of keeping its shape and the wefts are of multi-filaments of polyester having a closeness imparting waterproofness to the sheet.
Specification