The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 1994
Filed:
Dec. 11, 1992
Joachim Vester, Aidlingen, DE;
Heinz Sommer, Boeblingen, DE;
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An adapter cable is used for connecting a pulsoximetry sensor unit to a medical measuring device. The pulsoximetry sensor unit comprises, among other components, two antiparallel-connected, light-emitting diodes, which are activated alternatingly by a pulse current source of the medical measuring device. Between said pulsoximetry sensor unit and said medical measuring device, a plurality of grounding lines extend within the adapter cable. In the case of a short circuit between one of the two supply lines of the antiparallel-connected, light-emitting elements and one of the grounding lines, the fault current is caused to flow in the grounding lines to a first node in accordance with the present invention, said first node being adapted to be connected to a reference potential of the medical measuring device via a first resistor. The voltage drop across said first resistor will cause firing of a thyristor structure, if a limit value is exceeded, provided that the instantaneous control phase of the pulse current source of the medical measuring device can cause an activation of a predetermined element of the two light-emitting elements. The triggered thyristor circuit will cause an activation of a switch, which will establish a shunt to the light-emitting elements.