Kabushiki Kaisha Toyota Chuo Kenkyusho

Masakazu Mizuno

Hazime Inagaki

Isemi Igarashi

A catheter tip pressure transducer for detecting the pressure in various portions of a living body accurately and safely comprises a pressure sensor disposed within the end portion of a catheter. The pressure sensor comprises a pressure sensitive diaphragm whereon strain gauges are formed by a diffusion method. The pressure sensor is mounted on an insulated supporting member without being secured firmly thereto. A protecting member made of silicone rubber fills the hollow portion of the catheter so as to isolate and protect the pressure sensor and the ambient body tissue. Pressure is accurately measured by the pressure sensor without being influenced by the thermal stresses which occur in the supporting member. Furthermore, electrical isolation and mechanical safety are obtained.

Catheter tip pressure transducer

An intracranial pressure transducer includes a casing comprising an annular member having a screwed part on an outer wall thereof for fitting and securing a skull of a body. A pressure-electric transducing portion including a supporting member which is inserted within an inner wall of the casing and is tightly fixed to the predetermined upper portion from a tip portion of the casing, an indicating circuit for indicating the intracranial pressure in response to an output of strain sensitive elements, and indicating means. The intracranial pressure transducer converts intracranial pressure of a cerebrospinal fluid to the internal pressure of a pressure receiving layer of the transducer by the copanar Coplanar method which maintains the dura to be coplanar by the depression of the pressure receiving layer of the transducer against the dura, applies internal pressure of the pressure receiving layer to a strain sensing member, supplies an electrical signal by a strain sensitive element in response to the internal pressure of the pressure receiving layer, and accurately and safely indicates the intracranial pressure on the indicating means.

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Nagoya, Japan

Masakazu Mizuno