Surgery – Diagnostic testing – Cardiovascular
Patent
1995-10-30
1998-06-16
Getzow, Scott M.
Surgery
Diagnostic testing
Cardiovascular
A61B 50424
Patent
active
057661332
ABSTRACT:
A test circuit and method for the integrity of electrode cables of a typical Holter machine for the recording of physiological signals, notably cardiac activity. This machine comprises: a plurality of signal terminals (16), which are ready to be connected each to a proximal extremity (20) of a cable (18) whose distal extremity (22) is connected to an external electrode (24) to be placed on the patient; amplifiers (30) receiving signals applied on the signal terminals; and circuit means for testing the integrity of the totality of electrical connections to the patient, comprising a current source (36), means (38, 40) to apply this current on terminals and means (34) to measure the voltage drop produced by the impedance of the circuit path (42) including the cable connected to the corresponding terminal and in which circulates the test current. The test means also includes in addition a pin (54) to test an individual cable, this pin being connected to a current source and being able to be put in contact with the distal extremity (22) of a given cable (18), whose proximal extremity (20) remains connected to its terminal (16), the test current circulating (58) between this terminal and the pin. Each of a number of individual cables in a bundle of cables can thus be manually tested by the device of the present invention to discriminate defective cables from electrodes that are poorly positioned on the patient.
REFERENCES:
patent: 5343870 (1994-09-01), Gallant et al.
ELA Medical S.A.
Getzow Scott M.
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