CN110823782A - Polymer pipe osmotic pressure detection device and application method thereof - Google Patents
Polymer pipe osmotic pressure detection device and application method thereof Download PDFInfo
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- CN110823782A CN110823782A CN201911162184.0A CN201911162184A CN110823782A CN 110823782 A CN110823782 A CN 110823782A CN 201911162184 A CN201911162184 A CN 201911162184A CN 110823782 A CN110823782 A CN 110823782A
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- pressure
- storage tank
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- 230000003204 osmotic effect Effects 0.000 title claims abstract description 25
- 229920000642 polymer Polymers 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 8
- 239000007788 liquid Substances 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000004891 communication Methods 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 13
- -1 polytetrafluoroethylene Polymers 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 4
- 210000004204 blood vessel Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000002054 transplantation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a polymer tube osmotic pressure detection device, which comprises a liquid storage tank for storing liquid; an air pump communicated with the liquid storage tank; a pressure relief device in communication with the reservoir; a liquid guide pipe communicated with the liquid storage tank and a pipe to be tested communicated with the liquid guide pipe; the inlet end of the liquid guide tube extends into the liquid in the liquid storage tank, the outlet end of the liquid guide tube is communicated with the pipe to be detected, the inlet end of the pipe to be detected is communicated with the outlet end of the liquid guide tube, the outlet end of the pipe to be detected is communicated with the drain valve, and one end of the liquid guide tube, which is communicated with the pipe to be detected, is provided with a pressure gauge for detecting the pressure at the inlet end; the air pump penetrates into the liquid storage tank through the air inlet pipe and is used for conveying air into the liquid storage tank, and the pressure release device is used for releasing air pressure in the liquid storage tank. The device can provide different hydrostatic pressures and can be stabilized at a set pressure for a long time so as to observe the water permeability of the outer wall of the pipe.
Description
Technical Field
The invention relates to an osmotic pressure detection device, in particular to a polymer pipe osmotic pressure detection device and a using method of the device.
Background
With the development of polymer materials, more and more polymer tubular products are used for preparing human blood vessel substitutes. As a blood vessel substitute, the water permeability of the blood vessel substitute must meet clinical requirements for transplantation so as to ensure that blood does not leak after transplantation. The permeability of the polymer pipe refers to the ability of liquid to penetrate through the fabric and can be characterized by the osmotic pressure of water. The method for detecting the osmotic pressure of water of different grafts has great difference, and the test conditions are different.
At present, equipment for testing water osmotic pressure monitors the internal water pressure through a pressure gauge by applying hydrostatic pressure to a measured high molecular pipe. Most of the pressure created by raising the water level exerts hydrostatic pressure on the fabric being tested. The testing of materials with higher water osmotic pressure is less convenient and higher pressure regulation is relatively difficult.
Disclosure of Invention
The invention provides a polymer pipe osmotic pressure detection device for solving the inconvenience caused by adjusting hydrostatic pressure through water level in the prior art, which can provide different hydrostatic pressures and can be stabilized at a set pressure for a long time so as to observe the water permeability of the outer wall of a pipe.
The technical scheme adopted by the invention is as follows: a polymer pipe osmotic pressure detection device comprises
A liquid storage tank for storing liquid;
an air pump communicated with the liquid storage tank;
a pressure relief device in communication with the reservoir;
a liquid guide pipe communicated with the liquid storage tank and a pipe to be tested communicated with the liquid guide pipe;
the inlet end of the liquid guide tube extends into the liquid in the liquid storage tank, the outlet end of the liquid guide tube is communicated with the pipe to be detected, the inlet end of the pipe to be detected is communicated with the outlet end of the liquid guide tube, the outlet end of the pipe to be detected is communicated with the drain valve, and one end of the liquid guide tube, which is communicated with the pipe to be detected, is provided with a pressure gauge for detecting the pressure at the inlet end;
the air pump penetrates into the liquid storage tank through the air inlet pipe and is used for conveying air into the liquid storage tank, and the pressure release device is used for releasing air pressure in the liquid storage tank.
Further, be provided with sealed lid on the liquid reserve tank be provided with blast pipe and feed liquor pipe on the sealed lid, pressure relief device includes blast pipe and the relief valve of setting on the blast pipe, be provided with the water intaking valve on the feed liquor pipe.
Further, be provided with pressure regulating valve in the intake pipe, pressure regulating valve is used for adjusting the air input, the tubular product level that awaits measuring sets up.
Further, the catheter is a hose.
Furthermore, a three-way pipe is arranged between the liquid guide pipe and the pipe to be measured, the first end of the three-way pipe is communicated with the liquid guide pipe, the second end of the three-way pipe is communicated with the pipe to be measured, the third section of the three-way pipe is communicated with a pressure gauge, the three-way pipe is horizontally arranged, and the three-way pipe and the pipe to be measured are positioned on the same horizontal plane.
Further, the pipe to be measured is connected and fixed with the adjacent pipes through pipe fasteners, each pipe fastener comprises an inner ring, an outer ring and a fastening bolt, the inner pipe is made of flexible materials capable of having flexibility, the outer ring is made of hard materials having strength, the outer ring is arranged on the periphery of the inner ring, the outer ring is a C-shaped ring, the fastening bolt is arranged at an opening of the C-shaped ring, and the fastening bolt is used for adjusting the size of the opening of the C-shaped ring.
Further, the flexible material is one of nylon, polytetrafluoroethylene, polyethylene, polypropylene or polyethylene terephthalate.
Further, the hard material is stainless steel.
Furthermore, a tooth-shaped notch is formed in the inner ring.
The invention also relates to a using method of the high polymer pipe osmotic pressure detection device, which comprises the following steps
Closing the pressure release device, starting the air pump, and allowing water in the water storage tank to pass through the liquid guide pipe, the pipe to be detected and the drain valve in sequence to drive away all air in the pipeline;
closing the drain valve;
pressurizing and adjusting the inflation quantity of the air pump, observing the indication value change of the pressure gauge and the surface of the pipe to be measured, wherein the pressurization and adjustment are performed for at least 30s every time of adjustment, and if no water seepage phenomenon exists on the surface of the pipe to be measured, the pressurization and adjustment are continued;
and recording the indication value of the pressure gauge after the water permeation phenomenon occurs on the surface of the pipe to be detected, wherein the indication value is the water permeation pressure of the pipe to be detected.
The beneficial effects produced by the invention comprise: the method for obtaining stable hydrostatic pressure by controlling different liquid level heights is omitted, different hydrostatic pressures (0 MPa-1.0 MPa) can be directly provided for the pipe to be measured in the horizontal position, and pressure measurement deviation caused by small liquid level difference is eliminated. And the hydrostatic pressure of the device is adjustable, and the device can keep any required time so as to observe the water permeation condition of the surface of the pipe to be detected.
Drawings
Fig. 1 is a schematic structural diagram of the pressure-controllable device for detecting water permeability of a polymer pipe according to the present invention.
FIG. 2 is a schematic diagram of a connection method of pipes to be tested.
FIG. 3 is a schematic view of a fastener structure at two ends of a pipe to be tested.
Detailed Description
The present invention is explained in further detail below with reference to the drawings and the specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
According to fig. 1, the device for detecting the osmotic pressure of the polymer tubing comprises a high-pressure air pump 1, a pressure regulating valve 2, a pressure release valve 3, a water inlet valve 4, a pressure gauge 5, a water discharge valve 6, a liquid storage tank with a pipeline (a water storage tank in the embodiment), a liquid guide pipe 9, a three-way pipe 10 and a tubing fastener 11; the pressure regulating valve 2, the pressure relief valve 3, the water inlet valve 4, the water outlet pipe 7 and the water storage tank 8 are connected; the water outlet pipe 7 is connected with a liquid guide pipe 9; the three-way pipe 10 is connected with the liquid guide pipe 9, the pressure gauge 5 and the three-way pipe joint 101; the drainage valve 6 is connected with the drainage valve connector 61, and the liquid guide pipe 9 is a hose.
The water storage tank 8 with the pipeline is split, the material is stainless steel, the top cover on the upper part of the water storage tank 8 is a sealing cover, the top cover can be separated, the high-pressure air pump 1 is communicated with the water storage tank 8 through an air inlet pipe, the air inlet pipe is provided with a pressure regulating valve 2, the top cover is provided with an exhaust pipe and a liquid inlet pipe, the exhaust pipe is provided with a pressure relief valve 4, the liquid inlet pipe is provided with a water inlet valve 3, and the liquid guide pipe 9 comprises; purified water is filled into the inner cavity at the lower part of the water storage tank 8 and is submerged by half of the water outlet pipe 7; the pressure regulating valve 2 is connected with the high-pressure air pump 1.
The liquid guide pipe 9 is connected with a pipe to be tested through a three-way pipe 10; the three-way pipe is horizontally arranged, and the three-way pipe and the pipe to be detected are positioned on the same horizontal plane. The first end and the second end are both ports in the horizontal direction, the third end is in the vertical direction, and the vertical end of the three-way pipe 10 is connected with the pressure gauge 5.
According to fig. 2, the horizontal end of the tee 10 is connected to a tee fitting 101; shearing a pipe 12 to be measured, wherein the length of the pipe is 80mm, and one end of the pipe is fixed by a pipe fastener 11 and a three-way pipe joint 101; the other end of the pipe 12 to be tested is connected with the drainage valve joint 61 and is fixed by the pipe fastening piece 11; the drain valve joint 61 is connected to the drain valve 6.
After a power supply of the high-pressure air pump 1 is started, the pressure release valve 3 and the water inlet valve 4 are closed, the pressure regulating valve 2 is slightly regulated, and water in the water storage tank 8 sequentially passes through the water outlet pipe 7, the liquid guide pipe 9, the three-way pipe 10, the pipe 12 to be detected and the water discharge valve 6 to drive away all air in the pipeline; when the drain valve 6 has no bubble, the valve is closed again; and finally, ensuring that the three-way pipe 10, the pipe 12 to be tested and the discharge valve 6 are on the same horizontal plane. And manually adjusting the pressure adjusting valve 2, observing the indication value change of the pressure gauge 5 and the surface of the pipe 12 to be measured, keeping the pressure adjustment for at least 30s every time of adjustment, and continuing the pressure adjustment if no water penetrates through the surface of the pipe 12 to be measured. When the surface of the pipe 12 to be measured has a small amount of water permeation, recording the indication value of the pressure gauge 5, wherein the indication value is the water permeation pressure of the pipe 12 to be measured.
After the test is finished, the pressure regulating valve 2 is regulated until the indication value of the pressure gauge 5 is zero, the water inlet valve 4 is opened, the pipe fastening piece 11 is unscrewed, the pipe 12 to be tested is dismounted, and the high-pressure air pump 1 is closed.
According to fig. 3, the pipe fastener 11 comprises: (1) an inner ring (fastener liner 112) made of a soft material such as nylon, polytetrafluoroethylene, polyethylene, polypropylene, polyethylene terephthalate; (2) the outer ring (the outer edge 111 of the fastener) is made of hard materials such as stainless steel, the outer ring is a C-shaped ring, a fastening bolt is arranged at the opening of the outer ring, two flanges which are outward in the radial direction are arranged at the opening of the C-shaped ring, a through hole is formed in each flange, and the fastening bolt penetrates through the two through holes to be connected with the two flanges; (3) the fastening bolt 113 is made of a hard material such as stainless steel. The fastener lining 112 has a pair of regular (multiple pairs of) tooth-shaped cuts in the radial direction, each pair of tooth-shaped cuts comprises a first tooth edge and a second tooth edge, a space is reserved between the first tooth edge and the second tooth edge, the tooth-shaped cuts are led to the outer wall from the inner wall, the tooth-shaped convex points and the tooth-shaped concave points of the single-side cut surface (the first tooth edge or the second tooth edge) are rectangular or trapezoidal and are arranged at intervals, and the tooth-shaped convex points of the opposite cut surface (the second tooth edge or the first tooth edge) are matched. After the pipe 12 to be measured is clamped and extruded, the wall surface of the pipe to be measured is irregular and randomly arranged and is wrinkled and bulged due to the reduction of the pipe diameter, a certain fine gap passage is generated by the inner wall bulge of the wrinkle bulge, high-pressure liquid can be extruded out of the pipe through the gap passage, the measurement of the surface osmotic pressure of the pipe is low, or the liquid pressure reaches a certain value and then the liquid is sprayed outwards, so that the hydraulic pressure cannot be improved. The spaced slits in fastener liner 112 allow the corrugation ridges to be controlled within the spacing between the first and second tooth edges, confined to a space of a certain width; the mutual embedding of tooth form concave point and bump can let the fold of uplift take place to buckle many times and then lead to inside gap to buckle many times to block the gap route, avoided the outflow of high-pressure liquid, this is that plane incision extrudees each other and can't accomplish. When the pipe 12 to be tested needs to be connected, the fastening screw 113 is loosened, two ends of the pipe 12 to be tested respectively penetrate through the inner cavity of the fastener liner 112 and are connected with the drain valve joint 61/three-way pipe joint 101, the pipe fastener 11 is moved to enable the inner cavity of the pipe fastener to face the outer wall of the drain valve joint 61/three-way pipe joint 101, the fastening screw 113 is tightened to enable the inner diameter of the outer edge 111 of the fastener to be reduced, the fastener liner 112 is squeezed to enable the tooth-shaped notch interval to be reduced to reduce the inner diameter of the fastener liner 112, and therefore the pipe wall of the pipe 12 to be tested is tightly fixed between the outer wall of the.
The three-way pipe joint 101 and the drain valve joint 61 can be designed to have different outer diameters so as to match the detection of the pipes 12 to be detected with different inner diameters. The device can fill the inner cavity of the pipe with flowing water in a horizontal position, indirectly adjust the water pressure by adjusting the air pressure of the liquid level of the water storage tank, and is suitable for water osmotic pressure test of the polymer porous pipe.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a polymer tubular product osmotic pressure detection device which characterized in that: comprises that
A liquid storage tank for storing liquid;
an air pump communicated with the liquid storage tank;
a pressure relief device in communication with the reservoir;
a liquid guide pipe communicated with the liquid storage tank and a pipe to be tested communicated with the liquid guide pipe;
the inlet end of the liquid guide tube extends into the liquid in the liquid storage tank, the outlet end of the liquid guide tube is communicated with the pipe to be detected, the inlet end of the pipe to be detected is communicated with the outlet end of the liquid guide tube, the outlet end of the pipe to be detected is communicated with the drain valve, and one end of the liquid guide tube, which is communicated with the pipe to be detected, is provided with a pressure gauge for detecting the pressure at the inlet end;
the air pump penetrates into the liquid storage tank through the air inlet pipe and is used for conveying air into the liquid storage tank, and the pressure release device is used for releasing air pressure in the liquid storage tank.
2. The polymer pipe osmotic pressure detection device according to claim 1, wherein: the pressure relief device comprises an exhaust pipe and a pressure relief valve arranged on the exhaust pipe, and a water inlet valve is arranged on the liquid inlet pipe.
3. The polymer pipe osmotic pressure detection device according to claim 1, wherein: the air inlet pipe is provided with a pressure regulating valve, the pressure regulating valve is used for regulating air inflow, and the pipe to be measured is horizontally arranged.
4. The polymer pipe osmotic pressure detection device according to claim 1, wherein: the liquid guide pipe is a hose.
5. The polymer pipe osmotic pressure detection device according to claim 1, wherein: a three-way pipe is arranged between the liquid guide pipe and the pipe to be measured, the first end of the three-way pipe is communicated with the liquid guide pipe, the second end of the three-way pipe is communicated with the pipe to be measured, the third section of the three-way pipe is communicated with a pressure gauge, the three-way pipe is horizontally arranged, and the three-way pipe and the pipe to be measured are positioned on the same horizontal plane.
6. The polymer pipe osmotic pressure detection device according to claim 1, wherein: the pipe to be tested is connected and fixed with adjacent pipes through pipe fasteners, each pipe fastener comprises an inner ring, an outer ring and a fastening bolt, the inner pipe is made of flexible materials capable of having flexibility, the outer ring is made of hard materials having strength, the outer ring is arranged on the periphery of the inner ring, the outer ring is a C-shaped ring, the fastening bolt is arranged at the opening of the C-shaped ring, and the fastening bolt is used for adjusting the size of the opening of the C-shaped ring.
7. The polymer pipe osmotic pressure detection device according to claim 6, wherein: the flexible material is one of nylon, polytetrafluoroethylene, polyethylene, polypropylene or polyethylene terephthalate.
8. The polymer pipe osmotic pressure detection device according to claim 6, wherein: the hard material is stainless steel.
9. The polymer pipe osmotic pressure detection device according to claim 6, wherein: the inner ring is provided with a tooth-shaped notch.
10. The use method of the polymer pipe osmotic pressure detection device based on the claim 1 is characterized in that: comprises the following steps
Closing the pressure release device, starting the air pump, and allowing water in the water storage tank to pass through the liquid guide pipe, the pipe to be detected and the drain valve in sequence to drive away all air in the pipeline;
closing the drain valve;
pressurizing and adjusting the inflation quantity of the air pump, observing the indication value change of the pressure gauge and the surface of the pipe to be measured, wherein the pressurization and adjustment are performed for at least 30s every time of adjustment, and if no water seepage phenomenon exists on the surface of the pipe to be measured, the pressurization and adjustment are continued;
and recording the indication value of the pressure gauge after the water permeation phenomenon occurs on the surface of the pipe to be detected, wherein the indication value is the water permeation pressure of the pipe to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911162184.0A CN110823782A (en) | 2019-11-25 | 2019-11-25 | Polymer pipe osmotic pressure detection device and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911162184.0A CN110823782A (en) | 2019-11-25 | 2019-11-25 | Polymer pipe osmotic pressure detection device and application method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110823782A true CN110823782A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911162184.0A Pending CN110823782A (en) | 2019-11-25 | 2019-11-25 | Polymer pipe osmotic pressure detection device and application method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252860A (en) * | 1997-04-21 | 2000-05-10 | 阿图尔-费希尔股份公司费希尔厂 | Pipe clamp |
| CN105021509A (en) * | 2015-07-16 | 2015-11-04 | 东华大学 | Pulsing-type artificial blood vessel overall water permeability tester and using method thereof |
| CN105951190A (en) * | 2016-07-25 | 2016-09-21 | 青岛中科凯尔科技有限公司 | Electrostatic spinning device for constantly supplying liquid through gas pressure |
| CN106641506A (en) * | 2015-08-17 | 2017-05-10 | 胜赛斯光谱责任有限公司 | Pipe coupling having double-threaded tightening fastener and associated methods |
| CN107271348A (en) * | 2017-07-06 | 2017-10-20 | 苏州大学 | A kind of medical artificial pipeline permeance property test system and its application method |
| CN208109651U (en) * | 2017-11-27 | 2018-11-16 | 郑州大学 | A kind of biomechanical property test device of scaffold for vascular tissue engineering |
| CN211478000U (en) * | 2019-11-25 | 2020-09-11 | 上海畅迪医疗科技有限公司 | Polymer tubular product osmotic pressure detection device |
-
2019
- 2019-11-25 CN CN201911162184.0A patent/CN110823782A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252860A (en) * | 1997-04-21 | 2000-05-10 | 阿图尔-费希尔股份公司费希尔厂 | Pipe clamp |
| CN105021509A (en) * | 2015-07-16 | 2015-11-04 | 东华大学 | Pulsing-type artificial blood vessel overall water permeability tester and using method thereof |
| CN106641506A (en) * | 2015-08-17 | 2017-05-10 | 胜赛斯光谱责任有限公司 | Pipe coupling having double-threaded tightening fastener and associated methods |
| CN105951190A (en) * | 2016-07-25 | 2016-09-21 | 青岛中科凯尔科技有限公司 | Electrostatic spinning device for constantly supplying liquid through gas pressure |
| CN107271348A (en) * | 2017-07-06 | 2017-10-20 | 苏州大学 | A kind of medical artificial pipeline permeance property test system and its application method |
| CN208109651U (en) * | 2017-11-27 | 2018-11-16 | 郑州大学 | A kind of biomechanical property test device of scaffold for vascular tissue engineering |
| CN211478000U (en) * | 2019-11-25 | 2020-09-11 | 上海畅迪医疗科技有限公司 | Polymer tubular product osmotic pressure detection device |
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