MEDICAL PROSTHESIS FOR DUCTS OR CONDUITS

• US 3,818,511 A
• Filed: 11/17/1972
• Issued: 06/25/1974
• Est. Priority Date: 11/17/1972
• Status: Expired due to Term

• Current Assignee: Edward M. Goldberg, Ralph G. Ostensen, Seymour Bazell
• Original Assignee: Edward M. Goldberg, Ralph G. Ostensen, Seymour Bazell
• Inventors: Goldberg, Edward M., Bazell, Seymour, Ostensen, Ralph G.
• Primary Examiner(s): Gaudet, Richard A.
• Assistant Examiner(s): Frinks, Ronald L.
• Application Number:
  US05/307,641
• Time in Patent Office: 585 Days
• Field of Search: 3/1,DIG.1 128/214R,214B,348,334R,334C,1R
• US Class Current: 623/1.31
• CPC Class Codes: A61B 2017/1139 Side-to-side connections, e.g. shunt or X-connections
• CPC Class Codes: A61M 1/3655 Arterio-venous shunts or fistulae
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation

Abstract

Medical prosthesis for ducts or conduits and method of manufacture. An exemplary embodiment is an arteriovenous shunt having a cannula terminated in a funnel in which the interior included angle ranges from 15* - 30*. The funnel is of an implantable, resilient silicone rubber into which a woven, flexible Dacron skirt is molded to enable suturing and tissue ingrowth at the anastomotic juncture. The silicone is of a medical type which is body tissue-compatible, and has sufficient elasticity and resilience to permit compliance during pulsatile fluid flow, storage and return of fluid kinetic energy, and accommodation to various sizes of vessels, ducts, or conduits. Actual experimental use shows improved results compared to prior types of tip-type cannulae.

Claims

1. A medical prosthesIs for providing vascular access to an arterialized vein which comprises:

a. a cannula;

b. a funnel assembly secured to an end of said cannula, said funnel assembly comprising;

i. a connector portion connected to said cannula;

ii. a funnel portion with walls having an included interior angle ranging from about 15* to 30, said walls tapering to a smaller thickness at the mouth of the funnel;

c. said funnel assembly being a tissue compatible, silicone rubber with sufficient flexibility and compliance so that in pulsatile flow, the funnel walls expand upon systole and deliver energy during diastole;

d. a flexible fabric skirt embedded in the walls of said funnel portion and extending outward from the edges of the funnel mouth a distance sufficient to provide for tissue growth therein and to connect the prosthesis through the skirt to a vein or artery.

2. A prosthesis as in claim 1 wherein a plane defined by the distal edge of said funnel mouth portion is oriented at an angle to the longitudinal axis of said connector portion to provide an elliptical funnel mouth.

3. A prosthesis as in claim 1 wherein a plane defined by the distal edge of said funnel mouth is oriented at substantially a 90* angle to the longitudinal axis of said connector portion.

4. A prosthesis as in claim 1 where a portion of said fabric adjacent said funnel mouth is impregnated with silicone rubber to provide suture anchorage for anastomosis.

5. A prosthesis as in claim 1 wherein said connector portion comprises a collar having an inner diameter suitable for fitting over said cannula and a shoulder to abut the end of said cannula.

6. A prosthesis as in claim 1 wherein said cannula is a body tissue compatible tube.

7. A prosthesis as in claim 6 wherein each end of said cannula has a funnel assembly secured thereto.

8. A prosthesis as in claim 6 wherein said cannula is silicone rubber.

9. A prosthesis as in claim 1 wherein said silicone rubber is a fluorosilicone rubber.