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. 30, 1990
Filed:
Jun. 03, 1988
Manfred Baier, Bretten-Diedelsheim, DE;
Roland Schafer, Bretten-Diedelsheim, DE;
Richard Wolf GmbH, , DE;
Abstract
In an apparatus for the insufflation of gas into a body cavity the dynamic pressure of the gas flow conducted to the body cavity and the static intra-abdominal pressure in the body cavity are detected with at least one measuring transducer. The electrical output signal of the measuring transducer detecting the pressure is converted by difference formation with a compensation signal, which substantially takes into account the resistance to flow of the instrument conducting the gas into the body cavity, into a difference signal corresponding to the static intra-abdominal pressure. With this signal a control circuit for the setting of the desired pressure value in the body cavity is controlled, in which respect the compensation signal in each case at the start of the insufflation is generated from the output signal of the relevant measuring transducer and is stored in a store and upon gas flow the stored compensation signal is fed to the one input and the output signal of the measuring transducer is fed to the other input of an operational amplifier for the formation of the difference signal, whilst the store at the input store is separated electrically from the measuring transducer by way of a switch.