Methods and apparatus for reducing noise in systems using thermi

Details Methods and apparatus for reducing noise in systems using thermi Methods and apparatus for reducing noise in systems using thermi

1998-05-01

1999-10-26

Kamm, William E.

Surgery

Diagnostic testing

Cardiovascular

A61B 5028

Patent

active

059719354

ABSTRACT:
A system for measuring biological functions of a patient, such as cardiac output, filters noise from a signal provided by a thermistor catheter inserted into the body of the patient. A signal-conditioning cable is disposed between the catheter and an instrument which processes the signal to measure cardiac output. The cable includes circuitry which forms, in combination with a thermistor of the catheter, a low-pass filter for attenuating thermal and high-frequency noise from the signal provided to the instrument. The instrument can more accurately measure cardiac output with the filtered signal than with an unfiltered signal. Although the circuitry which forms the low-pass filter may be combined with the catheter or the instrument, it is preferred to dispose the circuitry in a separate cable to reduce manufacturing costs of the catheter and retrofitting costs of existing instruments.

REFERENCES:
patent: 3766908 (1973-10-01), Haynes
patent: 4350168 (1982-09-01), Chable et al.
patent: 5056048 (1991-10-01), Seperant
Baxter Product Brochure "Thermodilution Cardiac Output Computer Technique Model COM-1.TM.." Apr. 1984.
Baxter Product Brochure "Connecting Cable and Accessories for the Model COM-1 Cardiac Output Computer." Apr. 1984.
Baxter Product Brochure "COM-2.TM. Performance You Can Trust" Nov. 1988.
Baxter Product Brochure "A New way to evaluation the `other` heart. REF.-1.TM." Apr. 1989.
Baxter Product Brochure "Explorer.TM.. The More Complete Picture." Apr. 1992.
Baxter Product Brochure "HP Vue Link and Baxter's Explorer.TM. and Vigilance.RTM. Monitors. Bringing It All Together" Oct. 1993.
Baxter Product Brochure "SAT-2.TM., An important event in Sv0.sub.2 monitoring." Aug. 1989.

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