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Thermodilution and pressure transducer balloon catheter

  • US 4,878,898 A
  • Filed: 09/16/1988
  • Issued: 11/07/1989
  • Est. Priority Date: 08/17/1987
  • Status: Expired due to Fees
First Claim
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1. A multiple lumen balloon catheter for pulmonary artery catheterization procedures comprising:

  • a multiple lumen catheter body having a distal end portion and proximal end portions;

    inflatable balloon means surrounding said distal end portion and including hollow elastic cylindrical sleeve means having inside and outside surfaces, said sleeve means adhesively affixed proximal to said distal end to said catheter body by the inside surface of said sleeve means and adhesively affixed adjacent to the distal end of said catheter body by the outside surface of said sleeve means which has been turned inwardly of the sleeve so as to be inside at least a portion of the inside surface of said sleeve means, andtransducer means containing housing means having a closed distal end and an open proximal end and capable of being received in fluid tight relationship at the distal end of one of said lumens and adhesively adhered therein, said housing means containing arranged therein a silicon strain gauge bridge within but not fixedly connected to said housing means having wire means electrically connected thereto said wire means communicating through said lumen to the proximal end portion of said catheter body;

    a piezoelectric Silicon strain gauge means having a front face and a rear face, said rear face being distally contiguous to said strain gauge bridge but not affixed thereto and in electrical contact therewith so that changes in resistance in said piezoelectric strain gauge means can be electrically sensed through the wire means electrically connected to said strain gauge bridge and said wire means, such changes in resistance being proportion to the pressure exerted onto the front face of said transducer means;

    force transmitting means closing the distal end of said housing and contiguous to the distal face of said strain gauge means said force transmitting means comprising metal diaphragm means normally in physical contact with said strain gauge means and a titanium diaphragm means located distally of said metal diaphragm means and contiguous thereto, covering said open distal end of said housing means and in fluid tight relationship therewith to form the distal face of said transducer housing means, whereby fluid pressure applied to the titanium diaphragm means transmits a force to said metal diaphragm and onto said strain gauge means to produce a change in resistance that is proportional to said applied force and detectable through the wire means electrically connected to said silicon strain gauge bridge; and

    said transducer means being located axially of the circumference of said balloon means when said balloon means is inflated.

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