Injector for applying fluids fitted with a pressure measuring system

• US 6,558,125 B1
• Filed: 09/13/2000
• Issued: 05/06/2003
• Est. Priority Date: 01/13/1999
• Status: Expired due to Term

• Current Assignee: Ulrich GmbH & Co., KG (Air Liquide SA)
• Original Assignee: Ulrich GmbH & Co., KG (Air Liquide SA)
• Inventors: Futterknecht, Hans-Dieter
• Primary Examiner(s): Preay, Charles G.
• Assistant Examiner(s): GRAY, MICHAEL KUHN
• Application Number:
  US09/646,250
• Time in Patent Office: 965 Days
• Field of Search: 417/1, 417/44.2, 417/44.9, 604/118
• US Class Current: 417/1
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/16854 by monitoring line pressure

Abstract

The injector of the invention serves for applying contrast media for X-ray or nuclear spin tomography and has a tube (3), as well as a roller pump (7) surrounded at least partially in peripheral direction by the tube (3) for transporting the fluid from a storage vessel (2) to a cannula. A pressure chamber (10) connected with the interior of the tube (3) through an opening (9) in the tube wall is provided, which has a component (11) adjustable under the effect of the fluid pressure, acting upon a pressure sensor (12).

Claims

1. Injector for applying fluids, particularly contrast media for X-ray or nuclear spin tomography, having a tube (3) as well as roller pump (7) at least partially surrounded in peripheral direction by the tube (3) for the transport of a fluid from a storage vessel (2) to a cannula, characterized in that a pressure chamber (10) connected with the interior of the tube (3) through an opening (9) in the tube wall is provided, which has a component (11) adjustable under the effect of the fluid pressure and which acts upon a pressure sensor (12).

2. Injector according to claim 1, characterized in that between two segments of the tube (3) a rigid pipe (13) with the opening (9) is inserted, the pressure chamber (10) being fastened to the same.

3. Injector according to claim 1, characterized in that the adjustable component (11) is formed by a liquid-proof elastic membrane.

4. Injector according to claim 1, characterized in that the adjustable component (11) is formed by a piston acting upon the pressure sensor (12) in cooperation with a prop tightened against the bottom of the pressure chamber (10).

5. Injector according to claim 1, characterized in that the adjustable component (11) is a piston tightened against the pressure-chamber wall acting directly upon the pressure sensor (12).

6. Injector according to claim 1, characterized in that the pressure chamber (10) and the thereto assigned pressure sensor (12) are provided twice.

7. Injector according to claim 1, characterized in that several openings (9) in the tube wall are assigned to the pressure chamber (10).

8. Injector according to claim 1, characterized in that the pressure chamber (10) is arranged on the cannula-side end of the tube (3).

9. Injector according to claim 1, characterized in that the tube (3) with the pressure chamber (10) and the pressure sensor (12) pass through a container (14) wherein a humidity sensor is arranged as a leak detector.

10. Injector according to claim 1, characterized in that the pressure sensor (12) is formed by an electric pressure receiver.

11. Injector according to claim 10, characterized in that an evaluation unit controlling the rotary speed of the pump is provided for the electric signals produced by the electric pressure receiver.