Tubular pressure transducer

• US 4,924,872 A
• Filed: 04/24/1989
• Issued: 05/15/1990
• Est. Priority Date: 08/18/1987
• Status: Expired due to Fees

• Current Assignee: Medex Incorporated (Smiths Group International Holdings Ltd.)
• Original Assignee: Medex Incorporated (Smiths Group International Holdings Ltd.)
• Inventors: Frank, Thomas P.
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US07/341,822
• Time in Patent Office: 386 Days
• Field of Search: 128/672.5, 128/748, 128/693, 128/734, 73/753-754, 73/730, 338/307-308, 338/314
• US Class Current: 600/486
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61M 2205/0227 Materials having sensing or indicating function, e.g. indicating a pressure increase
• CPC Class Codes: A61M 2205/0233 Conductive materials, e.g. antistatic coatings for spark prevention
• CPC Class Codes: A61M 2205/0294 Piezoelectric materials
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 39/08 Tubes; Storage means specially adapted therefor

Abstract

In a blood pressure monitoring system, a transducer which is a conductive rubber tube having conductive terminals at each end,

and circumferentially spaced conductors connected to said semi-conductive band,

whereby fluid under varying pressure will cause said insulative tube to expand and contract, thereby causing said semi-conductive band to expand and contract, thereby varying the resistance of the semi-conductive band.

Claims

1. A fluid pressure transducer comprising,

a resilient insulative tube,

a semi-conductive stripe deposited on said tube,

and conductors connected to said stripe,

said combination of resilient tube and stripe creating a sensor that varies in resistance upon expansion and contraction of the stripe when the insulative tube expands and contracts under varying pressure.

2. A fluid pressure transducer comprising,

a resilient insulative tube,

ions implanted in the surface of at least a portion of said tube to create a semi-conductive portion of said tube,

and conductors connected to the semi-conductive portion of said tube,

said combination of resilient tube and semi-conductive portion creating a sensor that varies in resistance upon expansion and contraction of the semi-conductive portion when the insulative tube expands and contracts under varying pressure.

3. A fluid pressure transducer comprising,

a resilient insulative tubing,

a semi-conductive band deposited on and partially surrounding a section of tubing,

and circumferentially spaced conductors connected to said semi-conductive band,

said combination of resilient tubing and band creating a sensor that varies in resistance upon expansion and contraction of the band when the insulative tubing expands and contracts under varying pressure.