CN211576496U

CN211576496U - Air tightness testing device for tubular medical instrument

Info

Publication number: CN211576496U
Application number: CN202020257634.6U
Authority: CN
Inventors: 姜黎
Original assignee: Chengdu Oci Medical Devices Co ltd
Current assignee: Chengdu Oci Medical Devices Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-09-25
Anticipated expiration: 2030-03-05

Abstract

The utility model relates to a tubular medical instrument air tightness testing device, the outside of the testing device comprises an operation panel, the inside of the testing device comprises an air source, a solenoid valve, a pressure sensor and a PLC, the operation panel is provided with a plurality of fixed joints, and the fixed joints are matched with the end opening of a product to be tested; the gas source is sequentially connected with the electromagnetic valve, the pressure sensor and the fixed joint through gas pipelines, and the operation panel is provided with an indicator lamp which indicates a detection result; and the electromagnetic valve, the pressure sensor and the indicator lamp are respectively connected with the PLC. The utility model discloses can be general in the airtight tubulose medical instrument's that uses of needs gas tightness test to provide the general method of confirming technological parameter, improve detection efficiency, and need not contact the water source.

Description

Air tightness testing device for tubular medical instrument

Technical Field

The utility model relates to a technical field of medical instrument detection test, especially a technical field of tubulose medical instrument gas tightness test.

Background

The airtightness requirement is applied to the tubular medical instrument used in a closed manner, and if the airtightness is insufficient, the use effect is influenced, so that the airtightness of the tubular medical instrument is usually detected firstly, the related industry standard only roughly writes a test method, and if the test is performed according to the simple method, the defects of complex operation and low efficiency exist, and misoperation is easy to occur, so that the detection needs to be performed again; in addition, the existing pipeline air tightness testing device needs to use a water tank, air is filled into one end of the pipe body and the tail end of the pipe body is blocked, the pipe body is in an inflation pressure maintaining state, the pipe body is immersed into water, the air tightness is judged in a bubble observation mode, the device is complex, products can be in contact with a water source, the products need to be dried, and the risk that initial pollution bacteria exceed the standard exists for medical equipment products.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem among the prior art, provide a tubulose medical instrument gas tightness testing arrangement and test method thereof, this equipment can be general in the gas tightness test that needs the tubulose medical instrument of airtight use to provide the universal method of confirming technological parameter, improve detection efficiency, and need not contact the water source.

In order to achieve the purpose, the utility model provides a tubular medical instrument air tightness testing device, the testing device comprises an operation panel outside, the testing device comprises an air source, a solenoid valve, a pressure sensor and a PLC inside, the operation panel provides a place for the detection of a product to be tested, the operation panel is provided with a plurality of fixed joints, the fixed joints are matched with the end opening of the product to be tested, and the product to be tested is inflated through the end opening; the gas source is sequentially connected with the electromagnetic valve, the pressure sensor and the fixed joint through gas pipelines, the fixed joint is connected with a product to be detected, and the operation panel is provided with an indicator lamp which indicates a detection result; and the electromagnetic valve, the pressure sensor and the indicator lamp are respectively connected with the PLC.

Preferably, the operation panel is further provided with a test button, the test button corresponds to the fixed joint, and the test button is electrically connected with the PLC.

Preferably, the indicator lamps comprise qualified indicator lamps and unqualified indicator lamps, and each group of fixed joints is provided with a group of indicator lamps.

Preferably, a power supply is further arranged in the testing device, and the power supply is connected with the PLC and the electromagnetic valve and supplies power to the testing device.

Preferably, one end of the product to be detected is connected with the fixed joint in a matching mode, and the other end of the product to be detected is closed.

Preferably, a sealing plate is further mounted on the operation panel, and the sealing plate can cover the operation panel.

A method for testing the air tightness of a tubular medical instrument comprises the following steps:

step one, connecting one end of a plurality of products to be tested with each fixed joint of a testing device respectively, and sealing the other end of the products to be tested;

step two, opening a test button, transmitting a signal to the PLC by the test button, controlling the opening of the solenoid valve by the PLC, filling gas with set pressure into a product to be tested by a gas source through the solenoid valve and a pressure sensor, and closing the solenoid valve after the pressure reaches a set value;

thirdly, the gas passes through the pressure sensor, the pressure sensor displays the pressure value of the passing gas, a signal is transmitted to the PLC, the PLC reads the pressure value at each moment of the pressure, the received pressure value is compared with preset test parameters, and a test result is judged;

and step four, the PLC controls the corresponding indicator light on the fixed joint to be turned on, and the test result is displayed.

Preferably, three parameters need to be determined in the third step: inflation time, pressure stabilization time and pressure maintaining time; and (3) air inflation time definition: a certain time is needed to ensure that the product to be measured is filled with gas with specified pressure; voltage stabilization time definition: the test device has system pressure drop and needs to be given a stable time; and definition of the pressure maintaining time: whether the pressure of the product to be tested is reduced in the time or not is judged, and if the pressure is reduced by 5 points (the PLC reading unit in the testing device is not kpa), leakage is proved; manner of determining inflation time: looking at the time in the program when the pressure rises to a maximum; the mode of determining the voltage stabilization time is as follows: determining the time required for the pressure to reach stability according to the change curve of the pressure along with the time; determining the pressure maintaining time: and after the pressure is stable, observing the change of the pressure along with the time, so that the product to be tested without leakage problem is obtained, the pressure drop does not exceed the qualified judgment value, the product is in a stable state, and the shorter pressure maintaining time is selected according to the production requirement.

Preferably, as a result of the test in the fourth step, after a set process time, when the pressure drop value collected by the pressure sensor exceeds a specified range, the test is determined to be failed, and a failure indicator lamp is turned on.

Preferably, after the set process time, the pressure drop value acquired by the pressure sensor is within the specified range according to the test result in the fourth step, the product is judged to be qualified, and the qualified indicator lamp is turned on.

The utility model has the advantages that:

1. the utility model discloses a simple and easy efficient gas tightness test equipment, this equipment can be general in the airtight tubulose medical instrument's that uses of needs gas tightness test to provide the general method of confirming technological parameter, provide the detection guideline for tubulose medical instrument's gas tightness test.

2. The utility model provides a check out test set simple manufacture, light in weight, it is with low costs, whether qualified judgement to tubulose medical instrument of staff is also more clear, simple.

3. The utility model discloses use in tubulose medical instrument's detection, gained fine effect, optimize detection method, effectively improve detection efficiency, test parameter determination method is simple reliable, and the test result is reliable fast.

The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view showing an external structure of an airtightness testing apparatus for a tubular medical device;

fig. 2 is a schematic view of the internal connection of a device for testing the airtightness of a tubular medical instrument.

In the drawings

1-qualified indicator light; 2-test button; 3-an operation panel; 4-unqualified indicator light; 5-fixing the joint; 6-closing the plate; 7-gas source; 8-an electromagnetic valve; 9-a product to be tested; 10-a pressure sensor; 11-a power supply; 12-PLC.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model discloses tubulose medical instrument gas tightness testing arrangement mainly used has airtight operation requirement's medical instrument, is applicable to the gas tightness detection of dialysis pipeline, pjncture needle, cerini dialyser cerini, perfusion ware etc. in the blood purification field.

The utility model discloses a testing arrangement comprises PLC12, power 11, air supply 7, pressure sensor 10, solenoid valve 8, test button 2 and the pilot lamp that shows as a result. The testing device comprises an operating panel 3 outside, an air source 7, an electromagnetic valve 8, a pressure sensor 10 and a PLC12 inside, wherein the operating panel 3 provides a place for detecting a product 9 to be tested, a plurality of fixed joints 5 are arranged on the operating panel 3, the fixed joints 5 are matched with end openings of the product 9 to be tested, and the product 9 to be tested is inflated through the end openings; the gas source 7 is sequentially connected with the electromagnetic valve 8, the pressure sensor 10 and the fixed joint 5 through gas pipelines, the fixed joint 5 is connected with a product to be detected 9, and the operation panel 3 is provided with an indicator light for indicating a detection result;

air supply 7 is whole testing arrangement air feed, above-mentioned each part is connected through the air pipeline respectively, air supply 7 passes through the air pipeline and in proper order with solenoid valve 8, pressure sensor 10, the product 9 that awaits measuring is connected, air supply 7 links to each other with solenoid valve 8's import, solenoid valve 8's export links to each other with pressure sensor 10's air inlet, pressure sensor 10's export links to each other with fixed joint 5, the air pipeline includes total air pipeline and branch gas pipeline, be connected to different fixed joint 5 respectively on, every branch gas pipeline all is furnished with solenoid valve 8 and pressure sensor 10 connected to it alone, pressure sensor 10 detects pressure variation, the atmospheric pressure in the product 9 that awaits measuring in real time is converted into the signal of telecommunication, solenoid valve 8 control switching air current, solenoid valve 8, pressure sensor 10, the pilot lamp is connected with PLC12 electricity. The opening and closing of the air flow is controlled by the PLC12 and the test result is given. The PLC12 is a programmable logic controller that uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, arithmetic operations, etc. and controls various types of machinery or manufacturing processes through digital or analog inputs and outputs, and records test information for access by workers.

Still install test button 2 on the operating panel 3, test button 2 corresponds with fixed joint 5, and test button 2 is connected with PLC12 electricity. The test button controls the system to start testing. The test buttons 2 can be arranged in a plurality of numbers, different fixed joints are controlled to be tested respectively, and only one test button 2 can be arranged to test in batches.

The pilot lamp shows the test result, the pilot lamp is including qualified pilot lamp 1 and unqualified pilot lamp 4, and fixed joint 5 all is equipped with a set of pilot lamp on every group fixed joint 5 with 2 at least 4 of test button that correspond. The qualified indicator light 1 is arranged in the upper row and is a green light; the unqualified indicator light 4 is arranged at the lower row and is a red light. The indicator light can be set to be only one type, and the indicator light is qualified or unqualified when being lightened, and the indicator light is not lightened, otherwise.

The inside power 11 that still is provided with of testing arrangement, power 11 is connected with PLC12, solenoid valve 8, for the testing arrangement power supply.

One end of the product to be tested 9 is connected with the fixed joint 5 in a matching mode, and the other end of the product to be tested 9 is closed. The sealing mode can be clamped by using a clamp, or the sealing mode can be the same as the connecting mode, and different connectors can be used as plugs, so that the sealing effect is realized.

The operation panel 3 is also provided with a sealing plate 6, and the sealing plate 6 can cover the operation panel 3.

A method for testing the air tightness of a tubular medical instrument is provided, and comprises the following steps: connecting a product to be tested, starting a test and reading a test result. The method specifically comprises the following steps:

step one, one end of a plurality of products to be tested 9 is connected with each fixed joint 5 of the testing device, and the other end of the products to be tested 9 is sealed;

step two, the test button 2 is opened, the test button 2 transmits a signal to the PLC12, the PLC12 controls the electromagnetic valve 8 to be opened, the air source 7 fills the air with set pressure into the product 9 to be tested through the electromagnetic valve 8 and the pressure sensor 10, and the electromagnetic valve 8 is closed after the pressure reaches a set value;

thirdly, the gas passes through the pressure sensor 10, the pressure sensor 10 displays the pressure value of the passing gas, a signal is transmitted to the PLC12, the PLC12 reads the pressure value at each moment of pressure, the received pressure value is compared with preset test parameters, and a test result is judged;

and step four, the PLC12 controls the corresponding indicator light on the fixed joint 5 to be turned on, and the test result is displayed.

The parameter determination method comprises the following steps: connecting qualified products, filling gas, drawing a pressure change curve, determining parameters and setting parameters;

three parameters need to be determined in the third step: inflation time, pressure stabilization time and pressure maintaining time;

and (3) air inflation time definition: a certain time is needed to make the product 9 to be measured filled with gas with specified pressure;

voltage stabilization time definition: the test device has system pressure drop and needs to be given a stable time;

and definition of the pressure maintaining time: whether the pressure of the product 9 to be tested is reduced in the time or not is judged, and if the pressure is reduced by 5 points (the PLC reading unit in the testing device is not kpa), leakage is proved;

manner of determining inflation time: looking at the time in the program when the pressure rises to a maximum;

the mode of determining the voltage stabilization time is as follows: determining the time required for the pressure to reach stability according to the change curve of the pressure along with the time;

determining the pressure maintaining time: after the pressure is stable, observing the change of the pressure along with the time, and selecting a shorter pressure maintaining time according to the production requirement, wherein the pressure drop of the product to be tested 9 without leakage problem does not exceed a qualified judgment value and is in a stable state;

specifically, the following description is provided: in order to guarantee the testing progress, if the pressure reading is smaller than a certain value during the period of inflation or pressure stabilization, the unqualified product 9 to be tested can be directly judged;

and (3) judging that the pressure drop value acquired by the pressure sensor 10 exceeds the specified range after the unqualified test result in the fourth step passes through the set process time, and lighting an unqualified indicator lamp 4.

And (3) after the qualified test result in the fourth step is processed for a set process time, when the pressure drop value acquired by the pressure sensor 10 is within a specified range, judging that the product is qualified, and lighting the qualified indicator lamp 1.

The product 9 to be tested of the tubular medical apparatus and instruments with different pipe diameters is provided with a connector at the testing tail end, and the connector at the tail end of the product 9 to be tested can be directly connected with the fixed connector 5 on the testing device regardless of the pipe diameter. The fixed joint 5 on the testing device can be set as the same type of joint, and different types of tubular medical instruments can be directly connected with the joint or connected through a switching device. Each connector has a connector matched with the connector, and the connectors are matched to complete the connection between the tubular medical instrument and the air tightness testing device.

For example, the connector on the testing equipment is a dialysis connector, the end connectors of the testing dialyzer/blood filter/perfusion apparatus/plasma separator and the like are blood chamber connectors, the dialyzer/blood filter/perfusion apparatus/plasma separator and the like can be directly connected with the blood chamber connectors for testing, the end connectors of the puncture needle and the like are wing type locking connectors, the puncture needle and the like need to be connected through a switching device, one end of the switching device is a sliding connector, and the other end of the switching device is a blood chamber connector. The connector used on the test equipment is a sliding connector, the connector at the test end is the air tightness of the medical instrument of the sliding connector, the connector on the test equipment can also be a sliding connector, and only the middle of the connector is connected through a communicating connector; the end connectors of the test pipeline and the like are the air tightness of the medical instrument of the dialysis connector, and the connectors used on the test equipment can be blood chamber connectors.

The utility model discloses the working process:

the working principle is as follows: after a product 9 to be tested is connected with the upper fixed joint 5, the test button 2 is pressed, the control program is edited by the PLC12, the valve is closed after the pressure reaches a set value, and after the set process time, if the pressure drop value acquired by the pressure sensor 10 exceeds a specified range, the product is determined to be unqualified, and the unqualified indicator lamp 4 is turned on; if the pressure drop value is within the specified range, the product is judged to be qualified, and the qualified indicator lamp 1 is turned on.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims

1. The tubular medical instrument air tightness testing device is characterized in that an operation panel (3) is arranged outside the testing device, an air source (7), an electromagnetic valve (8), a pressure sensor (10) and a PLC (programmable logic controller) (12) are arranged inside the testing device, the operation panel (3) provides a place for detecting a product (9) to be tested, a plurality of fixed joints (5) are arranged on the operation panel (3), the fixed joints (5) are matched with end openings of the product (9) to be tested, and the product (9) to be tested is inflated through the end openings; the air source (7) is sequentially connected with the electromagnetic valve (8), the pressure sensor (10) and the fixed joint (5) through an air pipeline, the fixed joint (5) is connected with a product to be detected (9), and the operating panel (3) is provided with an indicator lamp which indicates a detection result; the electromagnetic valve (8), the pressure sensor (10) and the indicator light are respectively connected with the PLC (12).

2. The tubular medical device airtightness testing apparatus according to claim 1, wherein: still install test button (2) on operating panel (3), test button (2) correspond with fixed joint (5), and test button (2) are connected with PLC (12) electricity.

3. The tubular medical device airtightness testing apparatus according to claim 1, wherein: the indicating lamp comprises a qualified indicating lamp (1) and an unqualified indicating lamp (4), and a group of indicating lamps are arranged on each group of fixed joints (5).

4. The tubular medical device airtightness testing apparatus according to claim 1, wherein: the testing device is characterized in that a power supply (11) is further arranged inside the testing device, and the power supply (11) is connected with the PLC (12) and the electromagnetic valve (8) and supplies power to the testing device.

5. The tubular medical device airtightness testing apparatus according to claim 1, wherein: one end of the product (9) to be tested is connected with the fixed joint (5) in a matching way, and the other end of the product (9) to be tested is closed.

6. The tubular medical device airtightness testing apparatus according to claim 1, wherein: still install shrouding (6) on operating panel (3), shrouding (6) can cover operating panel (3).