Electric air pressure tourniquet

Abstract

The invention relates to an electric air pressure tourniquet applicable to the hemostasis operation in surgery and intravenous local narcotherapy. The electric air pressure tourniquet comprises a hemostasis loop, a hemostasis loop tube, a pump tube, a pump and a pressure control valve, wherein the hemostasis is bound on the hemostasis part of a living body; the pump offers power by the pressure control valve to tighten or loosen the hemostasis loop; a pressure sensor is used for measuring the pressure of the hemostasis loop; a static pressure filtering circuit for measuring the compression pressure in the pressure of the hemostasis loop and an arterial pulse wave detection circuit for measuring the arterial pulse wave in the pressure of the hemostasis loop are respectively connected with the pressure sensor; a static pressure A/D (Analog to Digital) converter and an arterial pulse wave A/D converter respectively convert and then transmit the signals detected in the static pressure filtering circuit and the arterial pulse wave detection circuit to an electronic control device; and the electronic control device controls the start and close of the pump, as well as the start and close of the pressure control valve.

Description

technical field [0001] The invention relates to an electro-pneumatic tourniquet, which is suitable for hemostasis in surgical operations and intravenous local anesthesia, in particular for blocking arterial blood flow from entering a certain part of a limb. Background technique [0002] During surgery and intravenous local anesthesia, an electropneumatic tourniquet system is commonly used to occlude arterial blood flow into a certain part of the extremity, thereby enabling a dry and bloodless surgical field to facilitate the surgical procedure. [0003] A typical electropneumatic tourniquet system in the prior art includes: an inflatable tourniquet cuff tied on a desired limb site, a tourniquet control instrument, and an air connection tube connecting the tourniquet cuff and the instrument. [0004] In some electropneumatic tourniquet systems in the prior art, the tourniquet cuff includes an inflatable part, and the inflatable part is connected to a tourniquet control instru...

AI Technical Summary

Problems solved by technology

However, using the principle of photoplethysmography to measure limb blocking pressure (LOP) has the following problems: 1. There must be a photoelectric blood flow sensor, and the sensor for detecting blood flow must be located at the distal end of the tourniquet limb. There is a time difference when the blood flow under the tourniquet cuff travels to the distal end, and the time difference between the hemostatic pressure of the cuff and the hemostasis detection will affect the measurement accuracy

Such significant changes will cause reasonable arterial fluctuations to be detected with difficulty or become undetectable, resulting in prolonged or unsuccessful measurements

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