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Intelligent constant-voltage variable-flow pneumoperitoneum machine

An insufflator and pressure technology, which is applied in therapeutic insufflators, applications, internal bone synthesis, etc., can solve the problems of poor pressure control accuracy, easy excessive overshoot, micro pressure can not be controlled, etc., to eliminate airflow fluctuations , Accurately simulate the effect of pressure in the operating cavity

Active Publication Date: 2009-07-22
庄海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The loopback air pressure deviation is large, which is easy to overshoot excessively and cause self-excited oscillation
Since what we are facing is not a closed container, but a surgical cavity in which doctors are constantly operating, the operation causes constant deflation and irregular disturbance, and the flow rate is erratic, so the actual pressure value in the surgical cavity is dynamic and uncontrollable
[0006]2. The pulsed air supply is easy to cause pressure shock to the operation cavity, which hides unsafe factors
[0007]3. The control period is long, easy to control out of step, and the pressure control accuracy is poor
Moreover, the output characteristics of the proportional pressure regulating valve or proportional flow regulating valve are particularly nonlinear in the small control volume section and the large control volume section, and there is a control dead zone near the micro control volume
[0013]Because of the long control cycle, poor linearity, hysteresis and insensitive areas, the control accuracy is not high, and the micro pressure cannot be controlled
The starting point of high-end pneumoperitoneum machine control pressure is generally only 5mmHg (that is, 667Pa), while some laparoscopic operations (such as thyroid or newborn) pneumoperitoneum machine control pressure is generally set at 5-8mmHg (ie <1066Pa), when away from the nerve center When it is very close, the pressure control value of 5mmHg [that is, 667Pa] is the clinical safety pressure requirement. If the effective pressure control margin is insufficient, it will bring uncertain risks

Method used

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  • Intelligent constant-voltage variable-flow pneumoperitoneum machine

Examples

Experimental program
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Effect test

Embodiment 1

[0085] refer to figure 1 — Figure 12 , Fig. 14, an intelligent constant-pressure variable-flow insufflation machine includes a pressure reducing valve for communicating with an external air source and supplying air to the machine, and also includes: an operating cavity pressure equivalent device with buffering airflow and filtering functions, and the pressure The equivalent device is in the shape of a container and is directly connected to the operating cavity through a gas delivery pipe; the digital linear proportional flow parallel control valve used to control the gas flow to the operating cavity is synchronously connected in parallel by N high-speed solenoid valves controlled by a microcomputer Split flow, N is the number of solenoid valves, N is a natural number and N≥2, each high-speed solenoid valve is connected in series with a precision throttle valve, and the pipeline channel flow rate of the precision throttle valve corresponding to each high-speed solenoid valve ...

Embodiment 2

[0116] refer to figure 1 , Figure 4 , Figure 5 , Figure 9 — Figure 12 , the micro-pressure sensor of this embodiment includes two pressure sensors, the two pressure sensors are connected in parallel, the two pressure sensors are connected to the microcomputer main control unit, and the microcomputer main control unit also includes a A fault processing module that issues an instruction to cut off the flow parallel control valve and open the safety pressure relief valve when the value of the pressure sensor signal is abnormal or the value difference exceeds the limit.

[0117] In this embodiment, dual sensors are used for parallel detection. In order to ensure the stability and reliability of equipment pressure detection, the detection data is first filtered, analyzed and judged to ensure that the data is authentic and credible, and then used for control to ensure the safety, stability and reliability of equipment pressure detection. The pulse-regulated insufflation ma...

Embodiment 3

[0120] refer to figure 1 , Figure 4 , Figure 5 , Figure 9 — Figure 12, The intelligent constant pressure variable flow insufflation machine of this embodiment also includes a self-draining high-precision filter, the air source is connected to the self-draining high-precision filter, and the self-draining high-precision filter is connected to a precision pressure reducing valve.

[0121] This embodiment uses a combination of a self-draining high-precision filter and a precision pressure reducing valve. The self-draining high-precision filter provides clean and dry gas for the operating cavity, prevents impurities from entering the machine, and prolongs the life of the digital linear proportional flow parallel control valve. The precision pressure reducing valve reduces the pressure to about 0.02MPa, provides a precision low pressure source for parallel flow regulation, and ensures the accuracy of flow regulation.

[0122] Other structures and working processes of this ...

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Abstract

The invention provides an intelligent constant-pressure variable-current pneumoperitoneum apparatus, which comprises a pressure reducing valve, an operation-cavity pressure equivalent device, a digital parallel-connection control valve for linear proportional flow rate, and a micropressure sensor, wherein a pressure measurement point of the micropressure sensor is near a connection part of the pressure equivalent device and a gas pipe; an output signal of the micropressure sensor is transmitted to a microcomputer through an A / D conversion module; and the microcomputer comprises a pressure flow control unit. According to a calibration curve reflecting that the prestored pressure loss delta P of the gas pipe changes with flow rate, a delta P value under the current flow rate is acquired; an instantaneous pressure control value P-control of the operation-cavity pressure equivalent device is calculated to be equal to P-set plus delta P; the P-set is an expected pressure control value; the pressure-detection A / D conversion module acquires a present pressure value P-detection of an air outlet; a pressure deviation value delta P-difference is evaluated to be equal to P-control minus P-detection; and according to the pressure deviation value delta P-difference, a proportional-integral pressure-flow closed-loop method is adopted for regulation so as to allow the delta P-difference to trend to zero. The apparatus has the advantages that the apparatus is precise to control pressure flow, smooth to transmit gas and capable of controlling pressure and supplying gas under extreme micropressure, and applies to different operation types.

Description

technical field [0001] The invention relates to a special medical instrument in micro-pressure and micro-flow precision control equipment. A special micro-pressure and micro-flow precision control medical instrument and equipment. For the purpose of speculum operation field requirements, a gas delivery tube (through the air-filled gap between the trocar and the rigid tube scope) is connected to the device. Inflate the operation cavity during the operation to form a carbon dioxide gas operation cavity space in the body. This instrument is commonly known as an insufflation machine. Background technique [0002] The insufflation machine is an important equipment for laparoscopic surgery. It inflates the surgical site or cavity, which is convenient for doctors to observe, diagnose and treat. Since the equipment is a micro-pressure and micro-flow precision control equipment (working pressure is generally <2KPa〖that is 1-15mmHg〗; the maximum gas transmission volume is genera...

Claims

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Application Information

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IPC IPC(8): A61B17/94A61B1/32
CPCA61M13/003
Inventor 庄海
Owner 庄海
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