초록 ▼

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 diffu

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.

대표청구항 ▼

A catheter tip pressure transducer comprising: a needle tube having a pressure inlet hole opened in a side wall thereof proximate an end thereof; a support member disposed within said needle tube said support member being positioned opposite said pressure inlet hole of said catheter; a pressure sens

A catheter tip pressure transducer comprising: a needle tube having a pressure inlet hole opened in a side wall thereof proximate an end thereof; a support member disposed within said needle tube said support member being positioned opposite said pressure inlet hole of said catheter; a pressure sensor disposed within said needle tube, said pressure sensor comprising a semi-conductor block, said block including a recess located opposite to said support member, a thinner flat portion defined by said recess and being a pressure-sensitive diaphragm and located opposite to said pressure inlet hole, and a remaining thicker portion formed integrally with said thinner flat portion, said thicker portion of said pressure sensor being seated on said support member without being rigidly attached thereto and said diaphragm being located below the outer surface of said side wall of said needle tube; and at least one strain gauge disposed on a surface of said pressure-sensitive diaphragm opposite to a face of said diaphragm facing said recess, said at least one strain gauge having lead wires, whereby the pressure at said inlet hole acts on said diaphragm and said at least one strain gauge to change the electrical characteristics of said at least one strain gauge in proportion to said pressure, and said pressure sensor is unaffected by thermal stresses in said support member because of said unrigid attachment.