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:
Oct. 22, 1985
Filed:
Apr. 15, 1983
Michael R Manes, Littleton, CO (US);
Aspen Laboratories, Inc., Englewood, CO (US);
Abstract
A pneumatic tourniquet which automatically adjusts the pressure in the tourniquet cuff and in which the pressure adjustment is variable and depends on the sign and magnitude of the pressure error. There is an inflatable cuff, a motor and pump for inflating the cuff, a valve for deflating the cuff, a transducer for sensing the pressure in the cuff, and a switch for setting a desired cuff pressure. A microprocessor is responsive to signals from the transducer and switches to calculate a duty cycle related to the pressure error. The microprocessor periodically applies a signal to the motor or valve during the calculated duty cycle to provide an adjustment to cuff pressure related to pressure error. The microprocessor also is responsive to motor speed and accumulated error history to provide further adjustments to the pressure.