Detection device for detecting pressure of medical instrument

Abstract

The invention provides a detection device for detecting the pressure of a medical instrument, and belongs to the technical field of pressure detection, the detection device comprises a pressure probe, a shell, a sensing circuit, a wire outlet column and a plug, the sensing circuit is welded on a pin of the pressure probe, then glue pouring and pre-fixing are carried out, the shell is used for protection, and the wire outlet column and the plug are used for signal output. The pressure probe comprises a framework, the surface of the whole outer cylinder is coated with a glass insulating layer, the framework is arranged in a stepped hole of the switching support, and the connecting part of the framework and the switching support is connected and fixed through a glass packaging technology. Key technologies such as packaging of a dual-redundancy non-oil-filled core body, fusion of a filler neck and a pressure core body, an integrated conditioning chip and a sensor high-precision temperature compensation technology are adopted, and scheme development work of a micro-miniature pressure core body, high-precision debugging and a dual-channel pressure sensor is completed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pressure detection, and particularly relates to a detection device for detecting pressure of medical equipment. BACKGROUND

[0002] In medical technology, liquids are supplied to or removed from patients or transferred between devices or machines by means of a hose. In this case, it often occurs that the hose is entangled or blocked, so that it is usually necessary to limit the internal pressure of the hose.

[0003] In conventional pressure sensors, the hose is pressed between two supports. One of the supports forms a fixed seat, and the other support is movable and is supported by a force sensor. The force sensor detects the force acting on the hose, which is balanced by the restoring force of the hose and the internal pressure of the hose. In order to measure the internal pressure with sufficient accuracy, it is necessary to know the hose used and its restoring capacity. In order to detect the material properties of the hose, time-consuming comparison measurements are necessary. However, the material properties of the hose usually depend on the temperature, so that different comparison measurements have to be carried out at different operating temperatures. The deformation force required to deform the hose is particularly large in the edge region of the hose, and adds a factor of 10 to the pressure signal. The deformation force is also not constant during the operation of the hose, so that the combined measurement of the two forces is very inaccurate. SUMMARY

[0004] The present application provides a detection device for detecting pressure of medical equipment, which comprises a pressure probe, a shell, a sensing circuit, a wire column and a plug, the sensing circuit is welded on the pin of the pressure probe, then is pre-fixed by filling glue, and is protected by the shell, and the wire column and the plug are used for signal output.

[0005] The pressure probe comprises a framework, the whole outer cylindrical surface is coated with a glass insulation layer, the framework is arranged in a stepped hole of an adapter support, the connection part of the framework and the adapter support is connected and fixed by a glass packaging process, the stepped hole of the adapter support is connected and fixed by the glass packaging process except the contact part with the framework, a platinum resistance wire is wound on the framework, the winding section of the framework is packaged by the glass packaging process, the joint of the platinum resistance wire is fixed by the glass packaging process at the contact part of the framework and the sintering part of the platinum resistance wire joint and the framework, one end of two lead wires is connected with two ends of the platinum resistance wire respectively, and the other end is used for connecting output wires, two lead wire fixing holes are arranged on the adapter support and the mounting seat, the two lead wires pass through the adapter support and the mounting seat in sequence and are fixed on the lead wire fixing holes, a pressure lead pipe is coaxial with the framework, one end of the pressure lead pipe is arranged in a center hole of the mounting seat, and the other end of the pressure lead pipe is used for connecting a pressure sensor; one end of the mounting seat is welded with the adapter support, and the other end of the mounting seat is provided with a mounting three-jaw, and the mounting three-jaw is provided with a mounting hole.

[0006] The sensing circuit includes two-stage buffer amplifiers having inputs coupled to the pressure probe and other components. The circuit can also include, for example, a charge pump connectable to the pressure probe for applications in which the sensor requires a DC bias. The circuit can also include other circuit components not shown in the figure, such as a band-shaping filter. The circuit in the digital sensor can include a delta-sigma analog-to-digital (A / D) converter circuit coupled to the outputs of the buffer amplifiers, including power, ground, outputs, and possibly other contacts connectable to corresponding contacts on an external device interface by wire bonding or other known or future interconnection technology.

[0007] Compared with the prior art, the application has the advantages and positive effects that: The application provides a detection device for detecting pressure of medical equipment, comprising a pressure probe, a shell, a sensing circuit, a wire column and a plug, the sensing circuit is welded on the pin of the pressure probe, then is pre-fixed by pouring glue, and is protected by the shell, signal output is performed by using the wire column and the plug, and key technologies such as double-redundancy non-oil-filled core packaging, fusion of a pipe mouth and a pressure core, integrated conditioning chip and high-precision temperature compensation technology of the sensor are adopted, and the scheme research and development of a miniature pressure core, high-precision debugging and a double-channel pressure sensor are completed. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0009] Fig. 1 It is a structural schematic diagram of a detection device for detecting pressure of medical equipment of the present application. Fig. 2 It is a sensing circuit diagram of a detection device for detecting pressure of medical equipment of the present application. In the above figures, 1 is a pressure probe; 2 is a shell; 3 is a wire column; 4 is a sensing circuit; and 5 is a plug. DETAILED DESCRIPTION

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0011] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description.

[0012] As shown in Embodiment 1, the present application provides a detection device for detecting pressure of medical equipment, comprising a pressure probe 1, a shell 2, a sensing circuit 4, an outlet post 3 and a plug 5, the sensing circuit 4 is welded on the pin of the pressure probe 1, then pre-fixed by glue pouring, protected by the shell 2, and signal output by the outlet post 3 and the plug 5. Figs. 1-2

[0013] The pressure probe 1 comprises a framework, the whole outer cylindrical surface is coated with a layer of glass insulation layer, the framework is arranged in the stepped hole of the adapter support, the connection part of the framework and the adapter support is connected and fixed by glass packaging process, the stepped hole of the adapter support is connected and fixed by glass packaging process except the contact part with the framework, the platinum resistance wire is wound on the framework, the winding section of the framework is packaged by glass packaging process, the joint of the platinum resistance wire is fixed by glass packaging process at the contact part of the framework and the sintering part of the platinum resistance wire joint and the framework, one end of the two leads is connected with the two ends of the platinum resistance wire respectively, the other end is used for connecting the output lead, two lead fixing holes are arranged on the adapter support and the mounting seat, the two leads pass through the adapter support and the mounting seat in sequence and are fixed on the lead fixing holes, the pressure lead pipe is coaxial with the framework, one end of the pressure lead pipe is arranged in the center hole of the mounting seat, the other end of the pressure lead pipe is used for connecting the pressure sensor; one end of the mounting seat is welded with the adapter support, the other end of the mounting seat is provided with a mounting three-jaw, the mounting three-jaw is provided with a mounting hole.

[0014] The sensing circuit 4 comprises two-stage buffer amplifiers having inputs coupled to the pressure probe 1 and other components. For example, the circuit can also include a charge pump connectable to the pressure probe 1 for applications where the sensor requires a DC bias. The circuit can also include other circuit components not shown in the figure such as a shaping filter. The circuit in a digital sensor can include a delta-sigma analog-to-digital (A / D) converter circuit coupled to the outputs of the buffer amplifiers, including power, ground, outputs, and possibly other contacts connectable to corresponding contacts on an external device interface by wire bonding or other known or future interconnection technologies.

[0015] ​The sensor adopts a compensation scheme of signal conditioning circuit, and the corresponding relationship between the output of the sensor chip and pressure and temperature is obtained by pre-calibration under standard temperature and pressure conditions. According to the data of the calibrated temperature and pressure points, the tool software analyzes and processes them, evaluates the corresponding rules of the output, temperature and pressure outside the calibration points, and converts the limited calibration conditions into a corresponding matrix of the temperature, pressure and output relationship in the form of a network. The more calibration temperature points selected and the more detailed calibration data, the higher the compensation accuracy of the sensor, but the cost will also increase. By studying the temperature output curve of the compensated object, the calibration points are reduced in the flat section and increased in the inflection point section, so that higher compensation accuracy can be obtained more economically. The temperature compensation scheme of the sensor can be calibrated and compensated after the seal by introducing a wire, can realize online calibration function on the machine or in the field working condition, can perform segmented DAC calibration to ensure the output accuracy as much as possible in the case of large temperature interval span leading to output offset, and can perform factory zero adjustment to use the calibration equipment under normal temperature conditions to adjust the output drift to zero full bit.

[0016] The above is only the preferred embodiment of the present application, and does not limit the present application in other forms. Any skilled person in the art can use the disclosed technical content to make changes or modifications to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments without departing from the technical solution content of the present application still belongs to the protection scope of the technical solution of the present application.

Claims

1. A detection device for detecting pressure in medical devices, characterized in that, include: The pressure probe (1), housing (2), sensing circuit (4), output terminal (3) and plug (5) are used. The sensing circuit (4) is soldered to the pins of the pressure probe (1) and then pre-fixed with potting glue. The housing (2) is used for protection. The output terminal (3) and plug (5) are used for signal output.

2. The detection device for detecting pressure in medical devices as described in claim 1, characterized in that, The pressure probe (1) includes a skeleton, the entire outer cylindrical surface is coated with a glass insulating layer, the skeleton is located in the stepped hole of the adapter support, the skeleton and the adapter support are connected and fixed by glass encapsulation process, and the step hole of the adapter support, except for the part in contact with the skeleton, is connected and fixed by glass encapsulation process.

3. The detection device for detecting pressure in medical devices as described in claim 2, characterized in that, The platinum resistance wire is wound on the skeleton, and the winding section of the skeleton is encapsulated using a glass encapsulation process. The contact part between the platinum resistance wire connector and the skeleton is fixed by a glass encapsulation process. One end of the two leads is connected to the two ends of the platinum resistance wire, and the other end is used to connect the output wire.

4. The detection device for detecting pressure in medical devices as described in claim 3, characterized in that, The adapter support and mounting base are provided with two lead wire fixing holes. The two leads pass through the adapter support and mounting base in sequence and are fixed in the lead wire fixing holes. The pressure tube is coaxial with the skeleton. One end of the pressure tube is located in the center hole of the mounting base, and the other end of the pressure tube is used to connect the pressure sensor. One end of the mounting base is welded to the adapter support, and the other end of the mounting base is provided with a mounting three-jaw, which is provided with mounting holes.

5. The detection device for detecting pressure in medical devices as described in claim 1, characterized in that, The sensing circuit (4) includes a two-stage buffer amplifier with inputs that connect to the pressure probe (1) and other components; the circuit also includes a charge pump that can be connected to the pressure probe (1) for applications where the sensor requires DC bias.

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