Pressure sensor

• US 6,889,556 B2
• Filed: 04/23/2003
• Issued: 05/10/2005
• Est. Priority Date: 04/24/2002
• Status: Active Grant

• Current Assignee: B Braun Melsungen AG (B. Braun Holding GmbH & Co. KG)
• Original Assignee: B Braun Melsungen AG (B. Braun Holding GmbH & Co. KG)
• Inventors: Steger, Juergen
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): Ellington, Alandra
• Application Number:
  US10/421,145
• Publication Number:
  US 20030217602A1
• Time in Patent Office: 748 Days
• Field of Search: 737/00, 737/15, 737/30, 737/56, 738/18, 738/24, 73861355-861357
• US Class Current: 73/756
• CPC Class Codes: A61M 1/3639 Blood pressure control, pressure transducers specially adapted therefor
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence

Abstract

A pressure sensor is provided with two supporting bodies (10,11) with plane supporting surfaces (12,13) between which a hose (14) is compressed or flattened. For measuring the internal pressure of the hose (14), pressure transmission means (17 or 22) is displaceable in a gap (16) that is arranged at a supporting body (10 or 11) adjacent to the compressed of flattened hose (14). The pressure transmission means (17 or 22) presses against the plane surface of the flattened-hose (14) and is supported on a force sensor (19). Thus, the deformation forces generated upon compressing the hose are eliminated for the measurement of pressure.

Claims

1. A pressure sensor comprising a hose for passing a fluid, two supporting bodies deforming the cross-section of the hose, and a force sensor reacting to the internal pressure of the hose, characterized in that at least one of the supporting bodies includes a force transmission means which extends over less than 25% of the lumen of the hose deformed by the supporting bodies, which is movable relative to this supporting body and presses against the hose with one end and against the force sensor with the other end.

2. The pressure sensor according to claim 1, characterized in that the force sensor is mounted to the supporting body including the force transmission means.

3. The pressure sensor according to claims 1, characterized in that the force transmission means consists of an incompressible gel.

4. The pressure sensor according to claim 1, characterized in that the force transmission means is arranged in a gap extending through the supporting body.

5. The pressure sensor according to claim 4, characterized in that the gap extends in longitudinal direction of the hose and in the middle of the cross-section thereof.

6. The pressure sensor according to claim 1, characterized in that the force transmission means consists of an elongate web.

7. The pressure sensor according to claim 6, characterized in that the web is a solid web.

8. A pressure sensor comprising a hose for passing a fluid, two supporting bodies deforming the cross-section of the hose, and a force sensor reacting to the internal pressure of the hose, wherein at least one of the supporting bodies includes a force transmission means which extends over less than 25% of the lumen of the hose deformed by the supporting bodies, which force transmission means is movable relative to the at least one supporting body and presses against the hose with one end of the force transmission means and against the force sensor with another end of the force transmission means.

9. The pressure sensor according to claim 8, wherein the force sensor is mounted to the at least one supporting body including the force transmission means.

10. The pressure sensor according to claim 8 wherein the force transmission means comprises an incompressible gel.

11. The pressure sensor according to claim 8, wherein the force transmission means is arranged in a gap extending through the at least one supporting body.

12. The pressure sensor according to claim 8, wherein the gap extends in longitudinal direction of the hose and in the middle of the cross-section thereof.

13. The pressure sensor according to claim 8, wherein in the force transmission means comprises an elongate web.

14. The pressure sensor according to claim 13, wherein the web comprises a solid web.