Esophageal transducer
First Claim
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1. A pressure sensing device for measuring pressure circumferentially in internal body cavities comprising:
- a catheter for introducing said pressure sensing device into the internal body cavities,a rigid cylindrical transducer housing connected to said catheter and defining an open cavity therein spaced along the length thereof, said housing having a distal end,pressure sensing means, mounted entirely within said housing and in pressure communication with said cavity, for generating an electrical signal in response to pressure in said cavity,means for sensing the pressure impinging on said transducer housing circumferentially comprising an annular flexible sleeve member contacting said housing coaxial therewith and surrounding said cavity,a liquid medium contained within said cavity and in contact with said flexible sleeve and said pressure sensing means for transferring pressure from the entire circumference of said flexible sleeve member to said pressure sensing means, electrical transmitting means connected to said pressure sensing means and passing through the distal end of said housing and passing through said catheter for transmitting said electrical signal to a receiver external to the body.
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Abstract
An esophageal transducer measures pressure due to esophageal contractions. The transducer is inserted into the esophagus at the end of a catheter. The transducer is fully contained within a housing at the end of the catheter and is capable of measuring pressure variations at all points about its entire circumference. The housing has a flexible portion extending around its entire circumference which encloses a fluid-filled section. The fluid of the fluid-filled section contacts a pressure-sensitive piezoelectric material which produces an electrical output indicative of pressure changes in the fluid-filled section.
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Citations
9 Claims
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1. A pressure sensing device for measuring pressure circumferentially in internal body cavities comprising:
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a catheter for introducing said pressure sensing device into the internal body cavities, a rigid cylindrical transducer housing connected to said catheter and defining an open cavity therein spaced along the length thereof, said housing having a distal end, pressure sensing means, mounted entirely within said housing and in pressure communication with said cavity, for generating an electrical signal in response to pressure in said cavity, means for sensing the pressure impinging on said transducer housing circumferentially comprising an annular flexible sleeve member contacting said housing coaxial therewith and surrounding said cavity, a liquid medium contained within said cavity and in contact with said flexible sleeve and said pressure sensing means for transferring pressure from the entire circumference of said flexible sleeve member to said pressure sensing means, electrical transmitting means connected to said pressure sensing means and passing through the distal end of said housing and passing through said catheter for transmitting said electrical signal to a receiver external to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification