Thermodilution and pressure transducer balloon catheter

Claim 2

A multiple lumen balloon catheter for pulmonary artery catheterization procedures comprising: a multiple lumen catheter body having a distal end portion and a proximal portion; inflatable balloon means surrounding said distal 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, and transducer means received in the distal end portion of said catheter body and adhesively affixed thereto, said transducer means having a deformable distal face generally perpendicular to the longitudinal axis of said catheter body, said face being capable of being deflected in response to fluid pressure, and further including strain gauge means communicating with said deformable distal face in a manner so as to be capable of exhibiting changes in electrical resis­tance in response to movements of said deformable distal face, said transducer means being located axially of said balloon means when said balloon means is inflated.

Claim 3

The multiple lumen catheter of claim 1 wherein said multiple lumen catheter further contains infusion means, said infusion means including another of said lumens, said lumen of said infusion means communicating with the outside of said catheter body at a first locus proximal to said distal tip and said lumen further provided to communicate with a source of infusion fluid at a second location proximal to said first locus.

Claim 4

The multiple lumen catheter of claim 1 wherein said multiple lumen catheter body further contains at least one additional lumen and temperature sensing means said tempera­ture sensing means including thermistor means located in said lumen and electrical measuring means, said electrical measur­ing means including connecting means connected to said thermistor means and to means for measuring and displaying temperatures sensed by said thermistor means.

Claim 5

The multiple lumen catheter of claim 2 wherein said thermistor means is located adjacent to the outer periphery of said catheter body at a position distal to said locus of communication of said infusion means lumen with the outside of said catheter body.

Claim 6

The multiple lumen catheter of claim 2 wherein said catheter comprises at least four lumens.

Claim 7

The multiple lumen catheter of claims 3 wherein said catheter comprises at least five lumens.

Claim 8

A multiple lumen balloon catheter for pulmonary artery catheterization procedures comprising: a multiple lumen catheter body having a distal end portion and a proximal portion; inflatable balloon means surrounding said distal 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, and transducer means received in the distal end portion of said catheter body and adhesively affixed thereto, said transducer means having a deformable distal face generally perpendicular to the longitudinal axis of said catheter body, said face being capable of being deflected in response to fluid pressure, and further including strain gauge means communicating with said deformable distal face in a manner so as to be capable of exhibiting changes in electrical resis­tance in response to movements of said deformable distal face, said transducer means being located axially of said balloon means when said balloon means is inflated, and infusion means including at least another of said lumens said infusion means being exposed to the outside of said catheter body proximal to said distal tip for introducing or receiving fluid therethrough, and temperature sensing means in at least one lumen exposed to the outside of said catheter body between said exposed infusion lumen and said distal tip for measuring the tempera­ture of the fluid external to said catheter body at the location of said temperature sensing means.

Claim 9

A multiple lumen balloon catheter for pulmonary artery catheterization procedures comprising: a multiple lumen catheter body having a distal end portion and a proximal portion; inflatable balloon means surrounding said distal 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, and transducer means received in the distal end portion of said catheter body and adhesively affixed thereto, said transducer means having a deformable distal face generally perpendicular to the longitudinal axis of said catheter body, said face being capable of being deflected in response to fluid pressure, and further including strain gauge means communicating with said deformable distal face in a manner so as to be capable of exhibiting changes in electrical resis­tance in response to movements of said deformable distal face, said transducer means being located axially of said balloon means when said balloon means is inflated, and infusion means including at least another of said lumens said infusion means being exposed to the outside of said catheter body proximal to said distal tip for introducing or receiving fluid therethrough, and temperature sensing means in at least one lumen exposed to the outside of said catheter body between said exposed infusion lumen and said distal tip for measuring the tempera­ture of the fluid external to said catheter body at the location of said temperature sensing means.