Pressure transducer magnetically-coupled interface complementing minimal diaphragm movement during operation

• US 5,392,653 A
• Filed: 12/16/1993
• Issued: 02/28/1995
• Est. Priority Date: 06/03/1992
• Status: Expired due to Term

• Current Assignee: Abbott Medical Optics Incorporated (Johnson & Johnson)
• Original Assignee: Allergan, Inc. (Canada) (Abbvie Incorporated)
• Inventors: Surber, Tim, Zanger, Frank, Lehmer, Donald E.
• Primary Examiner(s): Goldstein, Herbert
• Assistant Examiner(s): FELBER, JOSEPH LEON
• Application Number:
  US08/168,870
• Time in Patent Office: 439 Days
• Field of Search: 73/730, 73/723, 73/724, 73/725, 73/726, 73/727, 73/728, 73/754, 73/756, 128/675, 338/4
• US Class Current: 73/756
• CPC Class Codes: A61B 5/03 Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs A61B5/205 takes precedence
• CPC Class Codes: A61F 9/00736 Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments A61F9/008 takes precedence
• CPC Class Codes: A61M 1/732 Visual indicating means for vacuum pressure
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/772 operating alternately
• CPC Class Codes: G01L 9/0051 using variations in ohmic resistance
• CPC Class Codes: G01L 9/14 involving the displacement of magnets, e.g. electromagnets

Abstract

A pressure measurement system includes a diaphragm and a chamber for exposing one side of the diaphragm to a fluid. A force transducer is provided for measuring force exerted by the fluid on the one side of the diaphragm independent of diaphragm position. A ferromagnetic plate is attached to the diaphragm to enable removable coupling of the diaphragm with a magnet permanently attached to the force transducer.

Claims

1. A pressure measurement system comprising:

a diaphragm;

means for exposing one side of said diaphragm to a fluid;

force transducer means for measuring force exerted by said fluid on said one side of said diaphragm with minimal movement of diaphragm position; and

means for removably coupling said force transducer means to an opposite side of said diaphragm, the means for removably coupling comprising a ferromagnetic plate attached to said diaphragm and magnet means, attached to said force transducer means, for removably engaging the ferromagnetic plate.

2. The system according to claim 1 wherein said means for exposing one side of said diaphragm to a fluid comprises a chamber having a fluid inlet and a fluid outlet and said diaphragm is sealably disposed across an opening in said chamber.

3. The system according to claim 2 wherein said magnet means comprises an electromagnet.

4. The system according to claim 2 wherein said magnet comprises a permanent magnet.

5. The system according to claim 4 wherein said chamber has a cylindrical shape and said opening is disposed in a flat end of the chamber.

6. The system according to claim 5 wherein said opening, diaphragm and plate are circular.

7. The system according to claim 6 wherein said fluid inlet and outlet are disposed in a curved portion of said chamber.

8. The system according to claim 7 further comprising means for detecting magnetic coupling between the magnet and the plate.

9. A fluid pressure measurement system comprising:

a chamber having a fluid inlet and a fluid outlet, said chamber further including means for defining an opening therein;

a diaphragm sealably disposed across said opening;

force transducer means for measuring force exerted on said diaphragm by the fluid in the chamber; and

means for removably coupling said force transducer means to said diaphragm, the means for removably coupling comprising a ferromagnetic plate attached to said diaphragm and magnet means, attached to said force transducer means, for removably engaging the ferromagnetic plate.

10. The system according to claim 9 wherein said magnet means comprises an electromagnet.

11. The system according to claim 9 wherein said magnet comprises a permanent magnet.

12. The system according to claim 11 wherein said chamber has a cylindrical shape and said opening is disposed in a flat end of the chamber.

13. The system according to claim 12 wherein said opening, diaphragm and plate are circular.

14. The system according to claim 13 wherein said fluid inlet and outlet are disposed in a curved portion of said chamber.

15. The system according to claim 14 further comprising means for detecting magnetic coupling between the magnet and the plate.