Cannula

• US 4,368,738 A
• Filed: 03/31/1981
• Issued: 01/18/1983
• Est. Priority Date: 04/05/1980
• Status: Expired due to Term

• Current Assignee: Bionic Gesellschaft Fur Angewandet, Medizintechink Mbh + Co. KG
• Original Assignee: Bernd Tersteegen, Gunter Van Endert
• Inventors: Tersteegen, Bernd, van Endert, Gunter
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US06/249,357
• Time in Patent Office: 658 Days
• Field of Search: 128/348, 128/347, 128/221, 128/314, 128/329, 128/329 A, 128/339, 128/361, 27/24 A
• US Class Current: 604/180
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00

Abstract

An improved dialysis cannula includes an obliquely sharpened point formed by an oblique ground surface. The point includes a front portion which is disposed at an obtuse angle to the remainder of the ground surface, thereby providing a lancet-like front portion which facilitates proper insertion of the cannula into the blood vessel of a patient.

Claims

1. A dialysis cannula having an obliquely sharpened point formed by an oblique ground surface, wherein the point comprises a front portion disposed at an obtuse angle with respect to the ground surface.

2. A cannula as claimed in claim 1, wherein the front portion is distinguished from the rest of the point by a bend.

3. A cannula as claimed in claim 1, wherein the front portion is bent inwardly with respect to the longitudinal axis of the cannula.

4. A cannula as claimed in claim 2, wherein the front portion is approximately one-third of the length of the point.

5. A cannula as claimed in claims 1, 2, or 3, wherein the front portion has a slightly curved surface.

6. A cannula as claimed in claims 1, 2 or 3, wherein the front portion defines an essentially planar surface.

7. A cannula as claimed in any one of claims 1, 2 or 3, and a fixed handle projecting from the side of the cannula opposite the obliquely ground surface.

8. A cannula as claimed in claim 7, wherein the handle has on at least one side a self-sealing adhesive.

9. A dialysis cannula having an obliquely sharpened point formed by an oblique ground surface, wherein the point comprises a front portion disposed at an obtuse angle with respect to the ground surface, wherein the front portion is approximately one-third of the length of the point.

10. A dialysis cannula having an obliquely sharpened point formed by an oblique ground surface, wherein the point comprises a front portion disposed at an obtuse angle with respect to the ground surface, wherein the front portion is bent inwardly with respect to the longitudinal axis of the cannula, wherein the front portion is approximately one-third of the length of the point.