Catheter with pressure transducer next to the distal end

A - Human Necessities – 61 – B

Patent

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Details

A61B 5/0215 (2006.01) A61B 5/03 (2006.01)

Patent

CA 2305998

A device measures pressures in animals and humans and includes a pressure transmission catheter (22) filled with a pressure transmitting medium (26) and implantable in an area having a physiological pressure. A transducer (30) communicates with the pressure transmitting medium (26) to provide a pressure signal representing variations in the physiologic pressure on electrical wires (34). A connecting catheter (36) carries the electrical wires (34) to signal processing and telemetry circuitry (38), which transmits a telemetry signal representing the pressure signal to a receiver external to the animal or human. A housing (44) holds the signal processing and telemetry circuitry (38), but the transducer (30) is remote from the housing (44). The device performs measuring of venous pressure, pulmonary pressure, bladder pressure, or intracranial pressure without significant head pressure artifact and with a sufficient dynamic response. One embodiment of the catheter (22) includes a multi-durometer stem.

La présente invention concerne un dispositif permettant de mesurer des pressions chez l'animal et chez l'être humain, lequel dispositif comprend un cathéter de transmission de pression (22) rempli d'un milieu de transmission de pression (26) et pouvant être implanté dans une zone soumise à une pression physiologique. Un transducteur (30) communique avec le milieu de transmission de pression (26) pour transmettre sur des fils électriques (34) un signal de pression représentant les variations de la pression physiologique. Un cathéter de raccordement (36) transporte les fils électriques (34) jusqu'à un circuit de traitement des signaux et de télémétrie (38), qui transmet un signal de télémétrie représentant le signal de pression à un récepteur externe à l'animal ou à l'être humain. Un boîtier (44) protège le circuit de traitement des signaux et de télémétrie (38), mais le transducteur (30) est éloigné du boîtier (44). Le dispositif mesure la pression veineuse, la pression pulmonaire, la pression de la vessie ou la pression intracrânienne sans artéfact significatif dû à la pression de refoulement et avec une réaction dynamique suffisante. Dans un mode de réalisation, le cathéter (22) comprend une tige munie de plusieurs duromètres.

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