Gas tightness test device and test method for medical instrument

Abstract

A gas tightness test device and test method for a medical instrument. The test device comprises a bottom plate (1), wherein a test chamber (2) is fixedly connected to the top of the inner cavity of the bottom plate (1), a limiting cylinder (3) is slidably connected to one side of the inner cavity of the test chamber (2), a marking ring (4) is slidably connected to the inner cavity of the test chamber (2) by means of a connecting block, and a motor (5) is fixedly connected to one side of the top of the bottom plate (1) by means of a fixing block; and a detection assembly is provided in the inner cavity of the limiting cylinder (3), the detection assembly comprises a movable sealing plug (6), the movable sealing plug (6) is fixedly connected to one end of the limiting cylinder (3), and the inner cavity of the movable sealing plug (6) is in communication with a gas supply pipe (7). The top block (22) is driven by the motor (5) to move to enable the movable sealing plug (6) to move toward the fixed sealing plug (33) to seal and limit the medical instrument, the piston rod (10) is pressed by the top block (22) to allow the gas inside the piston cylinder (8) to be compressed and enter the interior of the medical instrument, and the lead screw (24) rotates to move the marking ring (4) to mark the specific gas leak position.

Description

Medical instrument air tightness testing device and testing method TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical instrument testing, in particular relates to a medical instrument air tightness testing device and testing method. BACKGROUND

[0002] The medical instrument air tightness testing device is a device for detecting the sealing performance of medical instruments (such as infusion devices, syringes, etc.) during use. Through this device, the sealing performance of medical instruments can be accurately detected to ensure that there is no gas leakage or insufficient air tightness during use, thereby ensuring the safety and reliability of medical instruments in various clinical scenarios.

[0003] The medical instrument air tightness testing device and testing method in the prior art usually uses a water immersion method to detect. This method may not be sensitive enough to detect small gas leaks, and some medical instruments cannot be completely immersed in water, which can easily cause damage to the medical instruments. Moreover, the existing medical instrument air tightness testing device can only detect whether there is gas leakage in the medical instrument, but cannot accurately find the specific location of the gas leakage, which affects the next evaluation and repair of the tester.

[0004] Therefore, we provide a medical instrument air tightness testing device and testing method to solve the above problems.

[0005] SUMMARY

[0006] The present application aims to provide a medical instrument air tightness testing device and testing method, which solves the problem of the prior art that a medical instrument air tightness testing device and testing method can only detect whether there is gas leakage in the medical instrument, but cannot accurately find the specific location of the gas leakage, by cooperation of the detection assembly and the marking assembly.

[0007] To solve the above technical problems, the present application is realized by the following technical scheme:

[0008] The present application is a medical instrument air tightness testing device and testing method, which comprises a bottom plate, a test chamber is fixedly connected to the top of the inner cavity of the bottom plate, a limiting cylinder is slidably connected to one side of the inner cavity of the test chamber, a marking ring is slidably connected to the inner cavity of the test chamber through a connecting block, and a motor is fixedly connected to one side of the top of the bottom plate through a fixed block.

[0009] The limiting cylinder inner cavity is provided with a detection assembly, the detection assembly comprises a movable sealing plug, the movable sealing plug is fixedly connected to one end of the limiting cylinder, the movable sealing plug inner cavity is communicated with a gas delivery pipe, one side of the limiting cylinder inner cavity is fixedly connected with a piston cylinder, the piston cylinder inner cavity is slidably connected with a piston plate, one side of the piston plate is fixedly connected with a piston rod, one side of the bottom of the limiting cylinder inner cavity is fixedly connected with a first spring rod, the top end of the first spring rod is fixedly connected with a first inclined block, and one side of the motor is provided with a pressurizing piece.

[0010] The marker ring inner cavity is provided with a marking assembly, the marking assembly comprises a square groove, the square groove is opened around the marker ring inner cavity, the square groove inner cavity top is fixedly connected with a second spring rod, the second spring rod bottom end is fixedly connected with a I-shaped plate, one side of the I-shaped plate top is fixedly connected with a second inclined block, one side of the square groove inner cavity bottom is fixedly connected with a baffle, the baffle inner cavity is slidably connected with a vertical plate, and the vertical plate bottom is fixedly connected with a marker ball.

[0011] The application further provides that the pressurizing piece comprises a screw rod, the screw rod is fixedly connected to the motor output end, the screw rod surface is threadedly connected with a threaded sleeve, one end of the threaded sleeve is fixedly connected with a top block, one side of the top block is slidably connected with one end of the piston rod, and one side of the screw rod surface is fixedly connected with a driving pulley.

[0012] The application further provides that the bottom plate inner cavity is rotatably connected with a lead screw through a bearing, one side of the lead screw surface is fixedly connected with a driven pulley, and the driven pulley and the driving pulley are drivingly connected through a belt.

[0013] The application further provides that the baffle top is fixedly connected with a reset spring, the reset spring top end is fixedly connected with a reset block, the reset block inner cavity is fixed to one side of the vertical plate surface, and the vertical plate top is movably connected with a roller.

[0014] The application further provides that one side of the square groove inner cavity top is fixedly connected with a limiting plate, the limiting plate inner cavity bottom is slidably connected with a T-shaped block, and the T-shaped block bottom is fixedly connected with a trapezoidal inclined block.

[0015] The application further provides that the lead screw surface is threadedly connected with a sliding sleeve, the sliding sleeve top and the marker ring bottom are fixed through a connecting block, the lead screw surface is slidably connected with a supporting plate, and the supporting plate top is fixed to the limiting cylinder bottom.

[0016] The application further provides that one side of the test bin inner cavity is fixedly connected with a fixed sealing plug, the fixed sealing plug inner cavity is communicated with a gas discharge pipe, and one side of the gas discharge pipe surface is sleeved with a solenoid valve.

[0017] The bottom plate is further provided with a vacuum pump fixedly connected to one side of the top of the bottom plate, and an air suction pipe is communicated with the output end of the vacuum pump and extends into the inner cavity of the test chamber.

[0018] The test chamber is further provided with a sealing door movably connected to the front of the test chamber through a hinge, and a handle is fixedly connected to the bottom of the front of the sealing door.

[0019] A test method based on the medical instrument air tightness test device of any one of the above, comprising the following steps:

[0020] S1, when in use, the sealing door is opened, and the tubular medical instrument to be tested is placed between the fixed sealing plug and the movable sealing plug, then the motor is started, the motor works to drive the screw to rotate, the screw drives the top block at one end of the threaded sleeve to move, the first inclined block at the bottom of one side of the inner cavity of the limiting cylinder is extruded, thereby driving the whole limiting cylinder to move to the right side of the inner cavity of the test chamber, so as to seal the through holes at both ends of the instrument to be detected by the movable sealing plug and the fixed sealing plug, and then the vacuum pump is started to pump air out of the test chamber, so that the test chamber reaches a vacuum state;

[0021] S2, when the inner cavities of the movable sealing plug and the fixed sealing plug are in contact with the through holes at both ends of the instrument to be detected and are sealed, the motor continues to work to drive the threaded sleeve to move, so that the top block extrudes the first inclined block, and the elasticity of the first spring rod makes the first inclined block move downward, so that the top block is in contact with the piston rod, and in the process of continuous movement of the threaded sleeve, the piston rod will extrude the piston plate, the movement of the piston plate compresses the gas in the piston cylinder and sends it to the inside of the instrument to be detected through the air supply pipe, so that the internal gas pressure increases, and the air tightness can be detected;

[0022] S3, when the motor drives the screw to rotate, the driving pulley rotates on the surface of the screw, and the driving pulley drives the driven pulley to rotate through the belt on the surface of the driving pulley, so as to rotate the lead screw, the lead screw drives the sliding sleeve to move, the sliding sleeve drives the marker ring to move through the connecting block, and when the movable sealing plug is driven to seal and limit the instrument, the marker ring and the movable sealing plug move synchronously, and after the inner cavity of the movable sealing plug is in contact with one end of the instrument, the lead screw continues to rotate to drive the marker ring to move due to the fact that the motor is still working, at this time the piston cylinder pressurizes the inner cavity of the instrument, when the instrument leaks, gas will be ejected outward, through the movement of the marker ring, when the gas at a certain position leaks and ejects, the I-shaped plate will be extruded, the I-shaped plate moves upward, the second inclined block extrudes the trapezoidal inclined block, the trapezoidal inclined block extrudes the roller, the vertical plate moves downward, the vertical plate drives the marker ball to move, the surface of the marker ball is in contact with the gas leakage position, the surface of the marker ball is coated with dye, so as to mark the specific gas leakage position, so as to complete the air tightness detection of the medical instrument.

[0023] The present application has the following advantages:

[0024] 1. This invention involves opening the sealing door and placing the tubular medical device to be tested between the fixed sealing plug and the movable sealing plug. Then, the motor is started, and the motor drives the screw to rotate. The screw drives the top block at one end of the threaded sleeve to move, which squeezes the first inclined block at the bottom of one side of the inner cavity of the limiting cylinder. This causes the limiting cylinder to move to the right side of the inner cavity of the test chamber, thereby sealing the through holes at both ends of the device to be tested by the movable sealing plug and the fixed sealing plug. Then, the vacuum pump is started to evacuate the air inside the test chamber, so that the inside of the test chamber reaches a vacuum state.

[0025] 2. In this invention, the movement of the threaded sleeve causes one side of the inner cavity of the movable sealing plug and the fixed sealing plug to fit into the through holes at both ends of the instrument to be tested, and seals them. While the screwed sleeve is moving, the motor continues to drive the threaded sleeve to move, causing the top block to press against the first inclined block. The elasticity of the first spring rod causes the first inclined block to move downward, thereby bringing the top block into contact with the piston rod. As the threaded sleeve continues to move, it will drive the piston rod to press against the piston plate. The movement of the piston plate compresses the gas inside the piston cylinder and sends it to the inside of the instrument to be tested through the air supply pipe, thereby increasing the internal air pressure and thus enabling the airtightness to be tested.

[0026] 3. This invention uses a motor to drive the active pulley on the surface of the screw to rotate, which in turn drives the driven pulley to rotate via a belt. This causes the lead screw to rotate, which in turn moves the sliding sleeve. The sliding sleeve, through a connecting block, moves the marking ring. When the moving sealing plug seals and limits the device, the marking ring and the moving sealing plug move synchronously. After one side of the inner cavity of the moving sealing plug is in contact with one end of the device, the lead screw continues to rotate and move the marking ring because the motor is still running. At this time, the piston cylinder pressurizes the inner cavity of the device. When there is an internal leak, gas will be ejected outward. Through the movement of the marking ring, when there is a gas ejection at a certain position, it will squeeze the I-shaped plate. The I-shaped plate moves upward, causing the second inclined block to squeeze the trapezoidal inclined block. The trapezoidal inclined block squeezes the roller, causing the vertical plate to move downward. The vertical plate moves the marking ball, causing the surface of the marking ball to contact the leak. The surface of the marking ball is coated with dye, thus marking the specific leak. This completes the airtightness test of the medical device.

[0027] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0029] Figure 1 is a three-dimensional view of the overall structure of a medical device airtightness testing device and testing method;

[0030] Figure 2 is an exploded view of the base plate and test chamber in a medical device airtightness testing device and testing method;

[0031] Figure 3 is an exploded view of a screw and a threaded sleeve in a medical device airtightness testing device and testing method;

[0032] Figure 4 is a sectional view of a test chamber in a medical device airtightness testing device and testing method;

[0033] Figure 5 is an exploded view of a moving sealing plug and a marking ring in a medical device airtightness testing device and testing method;

[0034] Figure 6 is a sectional view of a marking ring in a medical device airtightness testing device and testing method;

[0035] Figure 7 is an exploded view of the internal structure of a square groove in a medical device airtightness testing device and testing method;

[0036] Figure 8 is a sectional view of a limiting cylinder in a medical device airtightness testing device and testing method.

[0037] Figure 9 is an exploded view of a piston cylinder and a piston plate in a medical device airtightness testing device and testing method.

[0038] In the drawings: 1, base plate; 2, test chamber; 3, limiting cylinder; 4, marking ring; 5, motor; 6, moving sealing plug; 7, gas feeding pipe; 8, piston cylinder; 9, piston plate; 10, piston rod; 11, first spring rod; 12, first inclined block; 13, square groove; 14, second spring rod; 15, I-shaped plate; 16, second inclined block; 17, baffle; 18, vertical plate; 19, marking ball; 20, screw; 21, threaded sleeve; 22, top block; 23, driving pulley; 24, lead screw; 25, driven pulley; 26, return spring; 27, return block; 28, roller; 29, limiting plate; 30, trapezoidal inclined block; 31, sliding sleeve; 32, support plate; 33, fixed sealing plug; 34, gas discharging pipe; 35, vacuum pump; 36, sealing door. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, not all.

[0040] Embodiment One

[0041] Please refer to figures 1-9, the present application is a kind of medical instrument air tightness testing device, including bottom plate 1, the top of the inner cavity of bottom plate 1 is fixedly connected with test bin 2, the inner cavity of test bin 2 is slidably connected with limit cylinder 3 on one side, the inner cavity of test bin 2 is slidably connected with mark ring 4 through connecting block, the top of bottom plate 1 is fixedly connected with motor 5 on one side through fixed block;The inner cavity of limit cylinder 3 is provided with detection assembly, and the detection assembly includes mobile sealing plug 6, which is fixedly connected to one end of limit cylinder 3, and the inner cavity of mobile sealing plug 6 is communicated with gas supply pipe 7, the inner cavity of limit cylinder 3 is fixedly connected with piston cylinder 8 on one side, the inner cavity of piston cylinder 8 is slidably connected with piston plate 9, piston plate 9 is fixedly connected with piston rod 10 on one side, the inner cavity of limit cylinder 3 is fixedly connected with first spring rod 11 on one side at the bottom, the top of first spring rod 11 is fixedly connected with first inclined block 12, and the side of motor 5 is provided with pressurizing part;The inner cavity of mark ring 4 is provided with marking assembly, and the marking assembly includes square groove 13, which is formed in the inner cavity of mark ring 4 around, the inner cavity of square groove 13 is fixedly connected with second spring rod 14 at the top, the bottom of second spring rod 14 is fixedly connected with I-shaped plate 15, the top of I-shaped plate 15 is fixedly connected with second inclined block 16 on one side, the inner cavity of square groove 13 is fixedly connected with baffle 17 on one side at the bottom, the inner cavity of baffle 17 is slidably connected with vertical plate 18, and the bottom of vertical plate 18 is fixedly connected with mark ball 19.

[0042] Specifically: the left side of the inner cavity of the bottom is vacant, so as to place lead screw 24 and driven pulley 25, test bin 2 is fixedly connected to the top of the inner cavity of bottom plate 1, and the bottom of the inner cavity of test bin 2 coincides with the position of the top of the inner cavity of bottom plate 1, so that the part of lead screw 24 is located in the inner cavity of test bin 2, and the other part is located on the left side of the inner cavity of bottom plate 1, and the surface of lead screw 24 is sealingly connected between the inner wall of test bin 2, fifteen square grooves 13 are formed in the inner cavity of mark ring 4, and marking assembly is arranged in the inner cavity of each square groove 13, so as to mark any air leakage position on the surface of the instrument to be detected, motor 5 is fixed in the inner cavity of fixed block, and one end of gas supply pipe 7 extends into the inner cavity of piston cylinder 8;

[0043] The bottom of fixed block is fixed with the left side of the top of bottom plate 1, one side of mobile sealing plug 6 is fixed with one end of piston cylinder 8, the surface of piston plate 9 is sealingly slid with the inner cavity of piston cylinder 8, one end of piston rod 10 is fixedly connected with one side of piston plate 9, and the other end extends to the outside of piston cylinder 8, and the length of piston rod 10 is sufficient to drive piston plate 9 to move to the right end of the inner cavity of piston cylinder 8, first spring rod 11 supports first inclined block 12, and the surface of first inclined block 12 is in contact with the bottom of the top plate on one side in the initial state, the elasticity of first spring rod 11 is sufficient to support threaded sleeve 21 to drive the whole limit cylinder 3 to move, when mobile sealing plug 6 on one side of limit cylinder 3 is closely attached to the instrument to be detected, first inclined block 12 is pressed, so that first inclined block 12 moves downward;

[0044] The second spring rod 14 supports the I-shaped plate 15 and enables the I-shaped plate 15 to reset, the top of the I-shaped plate 15 is fixed to the bottom end of the second spring rod 14, the bottom has a large area so as to capture the air leakage in a larger range, the baffle 17 limits the vertical plate 18, and the surface of the marker ball 19 is coated with paint so as to mark the air leakage.

[0045] Specific embodiment two

[0046] Please refer to FIG. 1-9, on the basis of the specific embodiment one, the pressing member includes a screw rod 20, the screw rod 20 is fixedly connected to the output end of the motor 5, the surface of the screw rod 20 is threadedly connected with a threaded sleeve 21, one end of the threaded sleeve 21 is fixedly connected with a top block 22, one side of the top block 22 is slidably connected with one end of the piston rod 10, one side of the surface of the screw rod 20 is fixedly connected with a driving pulley 23, the inner cavity of the bottom plate 1 is rotatably connected with a lead screw 24 through a bearing, one side of the surface of the lead screw 24 is fixedly connected with a driven pulley 25, the driven pulley 25 is drivingly connected with the driving pulley 23 through a belt, the top of the baffle 17 is fixedly connected with a reset spring 26, the top end of the reset spring 26 is fixedly connected with a reset block 27, the inner cavity of the reset block 27 is fixed to one side of the surface of the vertical plate 18, and the top of the vertical plate 18 is movably connected with a roller 28.

[0047] Specifically, one end of the screw rod 20 is fixed to the output end of the motor 5, the other end is not in contact with one side of the test bin 2, the surface of the threaded sleeve 21 is movably connected with the inner wall of one side of the test bin 2, and the surface is in a sealed state with the inner wall, the sliding space between the threaded sleeve 21 and the test bin 2 limits the threaded sleeve 21, the top block 22 is fixed to one end of the threaded sleeve 21 and slides in the inner cavity of the limiting cylinder 3, the top of the top block 22 is fixedly connected with a sliding block, the top of the sliding block is slidably connected with the top of the inner cavity of the limiting cylinder 3, the two ends of the lead screw 24 are rotatably connected with one side of the inner cavity of the bottom plate 1 and the bottom of one side of the inner cavity of the test bin 2 through bearings, and the surface of the lead screw 24 is movably and sealingly in contact with the inner wall of the test bin 2.

[0048] The driven pulley 25 is drivingly connected with the driving pulley 23 through a belt, the inner cavity of the bottom plate 1 is provided with a square groove 13 on one side of the top, the belt extends from the inner cavity of the square groove 13 to the surface of the driven pulley 25, the top end of the reset spring 26 is fixed to the bottom of the reset block 27, the bottom end is fixed to the top of the baffle 17, and the reset spring 26 is sleeved on the surface of the vertical plate 18, and the inner cavity of the reset block 27 is slidably connected with the surface of the vertical plate of one side of the inner cavity of the square groove 13, and the reset block 27 is limited.

[0049] Specific embodiment three

[0050] Please refer to Figures 1-9, on the basis of the first embodiment, the inner cavity of the square groove 13 is fixedly connected with a limiting plate 29 at the top of one side, a T-shaped block is slidably connected in the inner cavity of the limiting plate 29, a trapezoidal inclined block 30 is fixedly connected to the bottom of the T-shaped block, a sliding sleeve 31 is threadedly connected to the surface of the lead screw 24, the top of the sliding sleeve 31 is fixed with the bottom of the marker ring 4 through a connecting block, a supporting plate 32 is slidably connected to the surface of the lead screw 24, the top of the supporting plate 32 is fixed with the bottom of the limiting cylinder 3, a fixed sealing plug 33 is fixedly connected to the inner cavity of the test bin 2, a deflation pipe 34 is in communication with the inner cavity of the fixed sealing plug 33, an electromagnetic valve is sleeved on one side of the surface of the deflation pipe 34, a vacuum pump 35 is fixedly connected to the top of the bottom plate 1 on one side, an air suction pipe is in communication with the output end of the vacuum pump 35, one end of the air suction pipe extends into the inner cavity of the test bin 2, a sealing door 36 is hingedly connected to the front of the test bin 2, and a handle is fixedly connected to the front bottom of the sealing door 36.

[0051] Specifically, a T-shaped groove is formed in the inner cavity of the limiting plate 29, and the surface of the T-shaped block is slidably connected with the inner cavity of the T-shaped groove, so as to support and limit the trapezoidal block, the left side of the trapezoidal inclined block 30 is slidably connected with the second inclined block 16, and the right side is slidably connected with the surface of the roller 28, a limiting strip is fixedly connected to the inner cavity of the test bin 2, a limiting block is fixedly connected to the bottom of the sliding sleeve 31, the inner cavity of the limiting block is slidably connected with the surface of the limiting strip, after the test is completed, the electromagnetic valve and the deflation pipe 34 can be used to release the gas in the tested instrument, the vacuum pump 35 can reduce the air pressure in the test bin 2 through the air suction pipe, so as to achieve a vacuum state, so as to facilitate the test, the frame of the sealing door 36 is fixedly connected with a sealing strip, and the inner cavity of the opening of the test bin 2 is fixedly connected with a sealing ring, so that the space in the test bin 2 is sealed after the sealing door 36 is closed.

[0052] A test method based on any one of the above medical device air tightness test devices, comprising the following steps:

[0053] S1, when in use, the tubular medical instrument to be tested is placed between the fixed sealing plug 33 and the movable sealing plug 6 by opening the sealing door 36, then the motor 5 is started, the motor 5 drives the screw rod 20 to rotate, the top block 22 at one end of the threaded sleeve 21 is moved by the screw rod 20, the first inclined block 12 at the bottom of one side of the limiting cylinder 3 is extruded, so as to drive the whole limiting cylinder 3 to move to the right side of the inner cavity of the test bin 2, so as to seal the through holes at both ends of the tested instrument by the movable sealing plug 6 and the fixed sealing plug 33, then the vacuum pump 35 is started to exhaust the test bin 2, so that the test bin 2 reaches a vacuum state;

[0054] S2, when the inner cavity of the mobile sealing plug 6 and the fixed sealing plug 33 is attached to the through hole at both ends of the instrument to be detected, and after sealing, the motor 5 continues to work to drive the threaded sleeve 21 to move, so that the top block 22 extrudes the first inclined block 12, and the first spring rod 11 is elastically moved downward, so that the top block 22 is in contact with the piston rod 10, and in the process of continuous movement of the threaded sleeve 21, the piston rod 10 is extruded to press the piston plate 9, the piston plate 9 is moved to compress the gas in the piston cylinder 8 and send it to the inside of the instrument to be detected through the gas pipe 7, so that the internal gas pressure is increased, and the air tightness can be detected;

[0055] S3, when the motor 5 drives the screw rod 20 to rotate, the driving pulley 23 rotates on the surface of the screw rod 20, and the driven pulley 25 is driven to rotate through the belt on the surface of the driving pulley 23, so as to rotate the lead screw 24, the sliding sleeve 31 is driven to move by the lead screw 24, and the sliding sleeve 31 drives the marking ring 4 to move through the connecting block. When the mobile sealing plug 6 is driven to seal and limit the instrument, the marking ring 4 and the mobile sealing plug 6 move synchronously, and after the inner cavity of the mobile sealing plug 6 is attached to one end of the instrument, the motor 5 continues to work, so that the lead screw 24 continues to rotate and drives the marking ring 4 to move. At this time, the piston cylinder 8 pressurizes the inner cavity of the instrument, and when the instrument leaks, gas will be ejected outward. When the gas leaks at a certain position, the marking ring 4 moves, and the gas ejection extrudes the I-shaped plate 15, the I-shaped plate 15 moves upward, the second inclined block 16 extrudes the trapezoidal inclined block 30, the trapezoidal inclined block 30 extrudes the roller 28, the vertical plate 18 moves downward, the marking ball 19 moves under the action of the vertical plate 18, and the surface of the marking ball 19 is in contact with the gas leakage position. The surface of the marking ball 19 is coated with dye, so that the specific gas leakage position can be marked, and the air tightness detection work of the medical instrument can be completed.

[0056] The working principle of the application is: when the air tightness of the medical instrument needs to be tested, first, open the sealing door 36 and place the tubular medical instrument to be tested between the fixed sealing plug 33 and the mobile sealing plug 6, then start the motor 5, the motor 5 drives the screw rod 20 to rotate, the screw rod 20 drives the threaded sleeve 21 to rotate, the threaded sleeve 21 drives the top block 22 to move, the top block 22 drives the first inclined block 12 to move, the limiting cylinder 3 drives the mobile sealing plug 6 to move, the mobile sealing plug 6 is attached to one end of the instrument to be detected, and the gas pipe 7 extends into the through hole of the instrument. At this time, the sealing door 36 is closed, and the vacuum pump 35 is opened, and the vacuum pump 35 uses the suction pipe to extract the inside of the test chamber 2 to a vacuum state;

[0057] When the motor 5 drives the screw rod 20 to rotate, the moving sealing plug 6 and the track sealing plug pair are used to seal and limit the instrument, the screw rod 20 drives the driving pulley 23 to rotate, the driving pulley 23 drives the driven pulley 25 to rotate through the belt, the driven pulley 25 drives the lead screw 24 to rotate, the lead screw 24 drives the sliding sleeve 31 to move, the sliding sleeve 31 drives the marker ring 4 to move synchronously with the moving sealing plug 6, when the sealing and limiting of the instrument is completed, the motor 5 continues to work, the screw rod 20 drives the top block 22 at one end of the threaded sleeve 21 to extrude the first inclined block 12, the first inclined block 12 moves downward through the first spring rod 11, the first inclined block 12 moves downward, and the limiting cylinder 3 stops moving, at this time, the top block 22 extrudes the piston rod 10, the piston rod 10 drives the piston plate 9 to move in the inner cavity of the piston cylinder 8, the internal air is compressed, and is sent to the inside of the instrument through the air pipe 7, so that the air pressure in the instrument is increased, when there is a problem of air tightness in the instrument, gas will leak from the inside of the instrument;

[0058] Since the motor 5 continues to work after the instrument to be tested is sealed and limited, the lead screw 24 continues to rotate under the cooperation of the driving pulley 23 and the driven pulley 25, the lead screw 24 drives the sliding sleeve 31 to move, the sliding sleeve 31 drives the marker ring 4 to move, when the piston cylinder 8 is inflated to the inside of the instrument, when the instrument leaks, gas will be sprayed out, when any one of the I-shaped plates 15 in the marker ring 4 is sprayed by the gas flow, the I-shaped plate 15 can move upward, the I-shaped plate 15 drives the second inclined block 16 to move, the second inclined block 16 extrudes the trapezoidal inclined block 30, the trapezoidal inclined block 30 slides to the right at the bottom of the limiting plate 29 through the T-shaped block, the trapezoidal inclined block 30 extrudes the roller 28, the vertical plate 18 moves downward, the vertical plate 18 drives the marker ball 19 to move downward, the marker ball 19 contacts the air leakage position, and the paint is stained on the air leakage position, so that the air tightness test of the medical instrument can be completed, and the accurate air leakage position can be found, so that the tester can evaluate and repair the medical instrument.

[0059] The standard parts used in the application can be purchased from the market, and can be customized according to the description and drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The mechanical parts and equipment adopt conventional models in the prior art. The control mode is automatically controlled through a control unit. The control circuit of the control unit can be realized through simple programming by the person skilled in the art, and belongs to the common knowledge in the field. Therefore, the control mode and circuit connection are not explained in detail in the application.

[0060] The above disclosed preferred embodiments of the present application are only used to help explain the present application, the preferred embodiments do not describe all the details, and the present application is not limited to the specific embodiments described, the description of these embodiments is selected and described in the present specification in order to better explain the principles and practical application of the present application, so that the persons skilled in the art can well understand and utilize the present application.

Claims

1. A medical device air tightness testing apparatus comprising a base plate (1), characterised in that: The bottom plate (1) inner cavity top fixedly connected with test bin (2), the test bin (2) inner cavity side slidingly connected with limit cylinder (3), the test bin (2) inner cavity is slidably connected with mark ring (4) through connecting block, the bottom plate (1) top side is fixedly connected with motor (5) through fixed block; The detection assembly is arranged in the inner cavity of the limit cylinder (3), the detection assembly includes a movable sealing plug (6), the movable sealing plug (6) is fixedly connected to one end of the limit cylinder (3), the inner cavity of the movable sealing plug (6) is communicated with a gas delivery pipe (7), one side of the inner cavity of the limit cylinder (3) is fixedly connected with a piston cylinder (8), the inner cavity of the piston cylinder (8) is slidably connected with a piston plate (9), one side of the piston plate (9) is fixedly connected with a piston rod (10), one side of the inner cavity of the limit cylinder (3) is fixedly connected with a first spring rod (11), the top end of the first spring rod (11) is fixedly connected with a first inclined block (12), and one side of the motor (5) is provided with a pressure device; The mark ring (4) inner cavity is provided with a marking assembly, the marking assembly includes a square groove (13), the square groove (13) is opened around the inner cavity of the mark ring (4), the inner cavity of the square groove (13) is fixedly connected with a second spring rod (14) at the top, the bottom end of the second spring rod (14) is fixedly connected with a work-shaped plate (15), one side of the top of the work-shaped plate (15) is fixedly connected with a second inclined block (16), one side of the bottom of the inner cavity of the square groove (13) is fixedly connected with a baffle (17), the inner cavity of the baffle (17) is slidably connected with a vertical plate (18), and the bottom of the vertical plate (18) is fixedly connected with a marking ball (19).

2. The device of claim 1, wherein: The pressure device includes a screw rod (20), the screw rod (20) is fixedly connected to the output end of the motor (5), the surface of the screw rod (20) is threadedly connected with a threaded sleeve (21), one end of the threaded sleeve (21) is fixedly connected with a top block (22), one side of the top block (22) is slidably connected with one end of the piston rod (10), and one side of the surface of the screw rod (20) is fixedly connected with a driving pulley (23).

3. The device of claim 1, wherein: The inner cavity of the bottom plate (1) is rotatably connected with a lead screw (24) through a bearing, one side of the surface of the lead screw (24) is fixedly connected with a driven pulley (25), and the driven pulley (25) is drivingly connected with the driving pulley (23) through a belt.

4. The device of claim 1, wherein: The top of the baffle (17) is fixedly connected with a return spring (26), the top end of the return spring (26) is fixedly connected with a reset block (27), the inner cavity of the reset block (27) is fixed to one side of the surface of the vertical plate (18), and the top of the vertical plate (18) is movably connected with a roller (28).

5. The device of claim 1, wherein: One side of the top of the inner cavity of the square groove (13) is fixedly connected with a limiting plate (29), the inner cavity of the limiting plate (29) is slidably connected with a T-shaped block, and the bottom of the T-shaped block is fixedly connected with a trapezoidal inclined block (30).

6. The device of claim 3, wherein: The surface of the lead screw (24) is threadedly connected with a sliding sleeve (31), the top of the sliding sleeve (31) is fixed with the bottom of the marker ring (4) through a connecting block, the surface of the lead screw (24) is slidingly connected with a supporting plate (32), and the top of the supporting plate (32) is fixed with the bottom of the limiting cylinder (3).

7. The device of claim 1, wherein: The inner cavity of the test chamber (2) is fixedly connected with a fixed sealing plug (33) on one side, the inner cavity of the fixed sealing plug (33) is communicated with a gas discharge pipe (34), and the surface of the gas discharge pipe (34) is sleeved with a solenoid valve on one side.

8. The device of claim 1, wherein: The top of the bottom plate (1) is fixedly connected with a vacuum pump (35) on one side, the output end of the vacuum pump (35) is communicated with an air suction pipe, and one end of the air suction pipe extends into the inner cavity of the test chamber (2).

9. The device of claim 1, wherein: The front of the test chamber (2) is hingedly connected with a sealing door (36), and the front of the sealing door (36) is fixedly connected with a handle.

10. A method of testing the air tightness of a medical device, based on the device of any one of claims 1 to 9, characterized in that: The steps include: S1, when in use, the sealing door (36) is opened, the tubular medical instrument to be tested is placed between the fixed sealing plug (33) and the movable sealing plug (6), then the motor (5) is started, the motor (5) drives the screw rod (20) to rotate, the top block (22) at one end of the threaded sleeve (21) is moved to press the first inclined block (12) on the bottom of one side of the limiting cylinder (3), so that the limiting cylinder (3) as a whole moves to the right side of the inner cavity of the test chamber (2), so that the movable sealing plug (6) and the fixed sealing plug (33) seal the through holes at both ends of the instrument to be tested, and then the vacuum pump (35) is started to pump the inside of the test chamber (2), so that the inside of the test chamber (2) reaches a vacuum state; S2, when the inner cavities of the movable sealing plug (6) and the fixed sealing plug (33) are attached to the through holes at both ends of the instrument to be tested and sealed, the motor (5) continues to work to move the threaded sleeve (21), so that the top block (22) presses the first inclined block (12), the first inclined block (12) is moved downward by the elasticity of the first spring rod (11), so that the top block (22) contacts the piston rod (10), and in the process of continuous movement of the threaded sleeve (21), the piston rod (10) is pressed to move the piston plate (9), the piston plate (9) moves to compress the gas in the piston cylinder (8) and sends the gas to the inside of the instrument to be tested through the gas supply pipe (7), so that the internal pressure is increased, and the air tightness can be detected; S3, when the motor (5) drives the screw rod (20) to rotate, the driving pulley (23) rotates on the surface of the screw rod (20), the driving pulley (23) drives the driven pulley (25) to rotate through the belt on the surface of the driving pulley (23), so that the lead screw (24) rotates, the lead screw (24) drives the sliding sleeve (31) to move, the sliding sleeve (31) When the marker ring (4) is moved by the connecting block, the marker ring (4) and the movable sealing plug (6) move synchronously when the movable sealing plug (6) is moved to seal and position the instrument, after the movable sealing plug (6) is attached to one end of the instrument on one side of the inner cavity of the movable sealing plug (6), the lead screw (24) continues to rotate to move the marker ring (4) because the motor (5) is still working, at this time the piston cylinder (8) pressurizes the inner cavity of the instrument, when the instrument leaks, gas will be ejected outward, through the movement of the marker ring (4), when there is gas injection at a certain position, the I-shaped plate (15) will be squeezed, the I-shaped plate (15) moves upward, so that the second inclined block (16) squeezes the trapezoidal inclined block (30), the trapezoidal inclined block (30) squeezes the roller (28), so that the vertical plate (18) moves downward, the vertical plate (18) drives the marker ball (19) to move, so that the surface of the marker ball (19) is in contact with the gas leakage position, the surface of the marker ball (19) is coated with dye, so as to mark the specific gas leakage position, so as to complete the air tightness detection work of the medical instrument.

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