System and method for exploration of the intrathoracic ventilato

Details System and method for exploration of the intrathoracic ventilato System and method for exploration of the intrathoracic ventilato

1975-05-22

1977-02-01

Michell, Robert W.

Surgery

Truss

Perineal

A61B 508

Patent

active

040057020

ABSTRACT:
The invention relates to a system and method for the exploration of the intrathoracic ventilatory mechanism which employs a signal y formed according to the equation: ##EQU1## IN WHICH V is the volume displaced in the mouth, dV/dt is the first derivative of V with respect to the time, Pp is the pleural pressure given by an oesophageal gas-bag, and .lambda..sub.1, .lambda..sub.2, .lambda..sub.3 are three adjustable parameters. The signal y is displayed on an oscilloscope as a loop which is a function of the volume V, and potentiometers corresponding to .lambda..sub.1, .lambda..sub.2, .lambda..sub.3 are adjusted to determine the value of the parameters. First, the potentiometers for .lambda..sub.2 are adjusted to cause the loop to close in a straight line, then the potentiometers for .lambda..sub.1 are adjusted until this straight line is horizontal, and subsequently the potentiometers for .lambda..sub.3 are adjusted until this straight line lies over the x axis. Therefore the values given to the parameters are .lambda..sub.2 = R intrathoracic resistance, .lambda..sub.1 = E intrathoracic elastance, and .lambda..sub.3 = E(Vo - Vr) where Vo is the pulmonary volume at the beginning of the inhalation and Vr the relaxation volume.

REFERENCES:
patent: 3480006 (1969-11-01), Schomber
patent: 3902481 (1975-09-01), Bargeton et al.
Comroe, et al., "Design of Body Plethys. for Studying Cardio. Physiology", J. of App. Phys., vol. 14, 1959, May, pp. 439-444.
Dubois et al., "Method for Measuring Airway Resist. in Man Using Body Plethys.", J. of Clinical Investigation, vol. 35, 1956, pp. 327-335.
Gulesian, "Instr. for Measurement of MEFV Parameters", IEEE Trans. on Bio-Med. Eng., Sept. 1971, pp. 378-382.
Jaeger et al., "Meas. of Airway Resist. . . . Body Plethys.", J. of App. Phys., vol. 19, No. 4, July 1964, pp. 813-820.

Affiliated with

Also associated with

Rating

System and method for exploration of the intrathoracic ventilato does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System and method for exploration of the intrathoracic ventilato, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for exploration of the intrathoracic ventilato will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1087205