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Flow control method and device of flow valve

A flow control device and flow control technology, applied in the direction of respirators, etc., can solve the problems of shortening the time to reach the target flow rate, the risk of damaging the patient's alveoli, and the large error in the initial stage of flow control, so as to shorten the target flow time and reduce the risk of alveoli Effect

Active Publication Date: 2014-07-02
BEIJING AEONMED
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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing flow valve flow rate control, such as the long time-consuming to reach the target flow rate, the large error in the initial stage of flow control, and the risk of damaging the patient's alveoli, the technical problem to be solved by the present invention is to propose a flow control method and device for the flow valve , can greatly shorten the time to reach the target flow rate, and provide the patient with an appropriate tidal volume at the initial stage, reducing the risk of damaging the patient's alveoli

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  • Flow control method and device of flow valve

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Embodiment Construction

[0039] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0040] figure 1 It is a flow chart of a flow control method of a flow valve provided by a specific embodiment of the present invention.

[0041] A flow control method of a flow valve is implemented according to the following steps:

[0042] Step S0: the anesthesia machine enters the parameter setting mode, and the control unit 1 in the anesthesia machine issues a calibration control command to calibrate the flow valve assembly to generate a flow rate-step data table. Wherein, the control unit 1 is a single-chip microcomputer, the model is ATMEGA128.

[0043] Step S1: the MCU converts the flow rate - the flow rate value v in the step data table n and with the velocity value v n Corresponding step value f n Stored in memory, the velocity value v n The anesthesia machine ends the parameter settin...

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Abstract

The invention discloses a flow control method of a flow valve and a device for realizing the method. The method includes: calibrating the flow valve to generate a flow rate-stepping data table, storing the flow rate value vn and the stepping value fn corresponding to the flow rate value vn in a storage, searching the flow rate-stepping data table according to a set target flow rate value vtarget to find the flow rate value vmin whose absolute difference with the target flow rate value vtarget is the minimal and the stepping value fmin corresponding to the flow rate value vmin, using the stepping value fmin to drive a stepping motor to adjust the openness of a needle valve so as to allow the actual flow rate value v passing the needle valve to be equal to vmin, and using a closed loop control manner to successively approximate the actual flow rate value v so as to allow the actual flow rate value v to be equal to vtarget.

Description

technical field [0001] The invention relates to the field of flow control, in particular to a flow control method and device for a flow valve. Background technique [0002] The anesthesia machine is a device that sends anesthetics / agents into the patient's alveoli through a mechanical circuit to form a partial pressure of anesthetic gas. After the anesthetic diffuses in the blood, it directly inhibits the central nervous system, thereby producing an anesthesia effect. The breathing circuit refers to the combined gas circuit device connected between the anesthesia machine and the patient, which inputs the mixed gas of anesthesia to the patient and returns the exhaled gas of the patient, so as to realize the anesthesia of the patient and meet the gas exchange required by the patient's normal breathing. [0003] In the flow rate control process of the breathing circuit, the target flow rate is usually set first, the stepper motor is driven to adjust the opening of the flow valv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M16/01A61M16/20
Inventor 贺金舟
Owner BEIJING AEONMED