Membrane splittable tubing
First Claim
1. A flexible splittable tube, said tube comprising an inner layer having a central bore and a relatively thick wall, said tube also including a second outer layer having a relatively thin wall, said wall of said inner layer having extending therethrough at least a first longitudinal slot for defining a longitudinal stress point along said outer layer, said at least first longitudinal stress point having an inward facing opening of a size to provide a stress on said outer layer when forced apart said outer layer being frangible and of a thickness to split upon the removal of said tube in the presence of an in-dwelling catheter occupying said central bore.
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Accused Products
Abstract
A splittable tube, useful in medical applications as a cannula for insertion into the body, comprises an inner and an outer layer. The inner layer defines a central lumen for accepting catheters and probes. The inner layer also includes a longitudinal slot through its wall for defining a stress line in the outer layer. The outer layer is very thin, membrane-like, and tears along the longitudinal stress line when the cannula is pulled to the side of a catheter occupying the central lumen. The tube may be made of electrically insulating material and used, for example, as strippable insulation as telephone or house wire, and strippable without the use of tools.
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Citations
11 Claims
- 1. A flexible splittable tube, said tube comprising an inner layer having a central bore and a relatively thick wall, said tube also including a second outer layer having a relatively thin wall, said wall of said inner layer having extending therethrough at least a first longitudinal slot for defining a longitudinal stress point along said outer layer, said at least first longitudinal stress point having an inward facing opening of a size to provide a stress on said outer layer when forced apart said outer layer being frangible and of a thickness to split upon the removal of said tube in the presence of an in-dwelling catheter occupying said central bore.
Specification