CN111504900A - Medical catheter coating firmness testing machine and testing method - Google Patents
Medical catheter coating firmness testing machine and testing method Download PDFInfo
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- CN111504900A CN111504900A CN202010532016.2A CN202010532016A CN111504900A CN 111504900 A CN111504900 A CN 111504900A CN 202010532016 A CN202010532016 A CN 202010532016A CN 111504900 A CN111504900 A CN 111504900A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Abstract
The invention relates to the field of quality inspection of medical instruments, in particular to a medical catheter coating firmness testing machine, which comprises a pressure testing machine and a movable coating friction device, wherein a clamp is arranged on the pressure testing machine, and the pressure testing machine can drive the clamp to vertically move and control pressure; the movable coating friction device comprises a workbench, a water tank driving device, a water tank, a particle filter and a negative pressure device; the water tank driving device is used for driving the water tank to move left and right relative to the workbench; the device is characterized in that a standard test block mounting groove is formed in the water tank, the bottom of the water tank is connected with a particle filter through a hose, and the particle filter is connected with a negative pressure device. The invention also provides a method for testing the coating firmness of the medical catheter. The invention realizes the automatic friction test of the medical catheter coating test sample block and the collection and counting of the falling coating particles in the liquid, can capture small falling coatings, has good repeatability, and improves the test speed and the test precision.
Description
Technical Field
The invention relates to the field of quality inspection of medical instruments, in particular to a machine and a method for testing coating firmness of a medical catheter.
Background
The medical catheter mainly has clinical purposes of establishing a passage, supporting and expanding tissues (blood vessels), delivering specific instruments, blood transfusion and fluid infusion, drainage and catheterization, collecting samples, monitoring vital signs and the like, and is more and more widely applied. When entering human tissues such as blood vessels, cavities and the like, the medical catheter can be contacted, rubbed and extruded with skin, mucous membranes, muscles and the like, so that discomfort and pain are brought to people, and particularly, the medical catheter needs to be placed for a long time and is possibly accompanied with the problems of bacterial infection and the like. To improve these problems, coating the surface of medical catheters with a coating using surface modification techniques is a common practice. The use of a coating, however, also introduces the risk that the coating may separate from the substrate and fall off. If the coating is removed, it does not achieve its intended friction reducing, pain relieving effects, and also causes coated foreign bodies to enter the body and even the blood vessels, causing inflammation, blood vessel blockage, canceration and death.
At present, the method for testing the coating firmness of the medical catheter comprises the following steps: rubbing the medical catheter and observing the surface condition of the coating by eye force or a microscope. This method has the following disadvantages: (1) only large drops can be observed, and small defects are often not observed, so that the test precision is low; (2) the friction force and the stroke of the friction movement are controlled by depending on the sense of a tester, the randomness is high, and the testing precision is low; (3) the testing efficiency is low.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a medical catheter coating firmness testing machine to realize the automatic friction test of a medical catheter coating test sample block, collect and count falling coating particles in liquid, capture small falling coatings, have good repeatability and improve the testing speed and the testing precision.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: a medical catheter coating firmness testing machine comprises a pressure testing machine and a movable coating friction device, wherein a clamp is mounted on the pressure testing machine, and the pressure testing machine can drive the clamp to vertically move and control pressure; the movable coating friction device comprises a workbench, a water tank driving device, a water tank, a particle filter and a negative pressure device; the water tank driving device is arranged on the workbench and is used for driving the water tank to move left and right relative to the workbench; the water tank is internally provided with a standard test block mounting groove, the bottom of the water tank is connected with a particle filter through a hose, and the particle filter is connected with a negative pressure device.
The technical scheme of the invention is as follows: the particle filter comprises an upper shell, a lower shell and a filter membrane, wherein a bracket is arranged in the lower shell, the filter membrane is arranged on the bracket, and the upper shell is detachably buckled and installed on the lower shell; the top of going up the casing is equipped with the inlet, the bottom of casing is equipped with the liquid outlet down, the bottom of water tank is passed through the hose and is connected with the inlet, the liquid outlet is connected with negative pressure device. By adopting the technical scheme, the filter membrane can be conveniently and quickly taken out, so that the test efficiency is improved; the particle that causes when also can prevent manual filtration runs off to guarantee experimental precision.
The technical scheme of the invention is as follows: the standard test block mounting groove is located in the middle of the water tank, the positions, located in front of and behind the standard test block mounting groove, in the water tank are provided with hoppers, and the bottoms of the hoppers are connected with the particle filter through hoses. By adopting the technical scheme, the fallen coating particles enter the particle filter through the conical hopper along with the eluent, so that the particles can be reduced to remain in the water tank, and the test precision is ensured.
The technical scheme includes that the fixture is connected with the pressure testing machine through an L-shaped arm frame, the L-shaped arm frame comprises a horizontal arm and a vertical arm, the fixture is arranged at the lower end of the vertical arm, the movable coating friction device further comprises a flushing device, the flushing device comprises two groups of flushing units symmetrically arranged on the front side and the rear side of a water tank, each flushing unit comprises a housing, a housing driving device, an upper flushing sprayer and a lower flushing sprayer, the housing driving device is used for driving the housing to move back and forth relative to a workbench, the housings of the two groups of flushing units can seal the top of the water tank, the upper flushing sprayer and the lower flushing sprayer are mounted on the side of the housing, the upper flushing sprayer is located above the lower flushing sprayer, the upper flushing sprayer faces obliquely upward, the lower flushing sprayer faces obliquely downward, the upper flushing sprayer and the lower flushing sprayer are both connected with a distilled water source with a flow meter, a notch matched with the vertical arm is formed in the top of the housing, after friction motion is finished, the pressure testing machine drives a test sample block to be in a closed, the upper flushing sprayer and the distilled water tank, and the lower flushing sprayer are used for counting of the flow rate of the test water for counting of the particles, and the test particles, and the flow meter for counting of the test water tank.
Compared with the prior art, the medical catheter coating firmness testing machine has the beneficial effects that: (1) the automatic friction test of the medical catheter test sample block is realized, and the particles of the falling coating are collected and counted in the liquid, so that the test efficiency is high; (2) the pressure F between the test sample block and the standard test block can be ensured to be constant through the pressure tester, and extremely small particles can be captured through the particle filter, so that the precision is high; (3) the test sample block made of the same material as the medical catheter base material and the coating not only ensures the truth degree of the test, but also has the advantages of easy processing and manufacturing of the test sample block and the clamp and low cost.
The invention also provides a medical catheter coating firmness testing method, which comprises the following steps:
A. preparing test equipment, which comprises a water tank, a test sample block, a standard test block, distilled water and a filter membrane; inspecting the standard test block to ensure that the surface of the standard test block is flat and smooth and has no particle attachments;
B. washing the water tank with distilled water, and discharging the eluate out of the water tank;
C. fixedly installing the standard test block in a water tank, and adding distilled water into the water tank;
D. immersing the test sample block below the liquid level of the water tank, and keeping the time t;
E. contacting the bottom surface of the test sample block with a standard test block, wherein the pressure value is F;
F. keeping the test sample block still and making the water tank reciprocate N times along a horizontal direction at a speed V;
G. separating the test sample block from the standard test block;
H. washing the test sample block with distilled water to ensure that no macroscopic particles exist on the surface of the test sample block and ensure that the eluent is collected in a water tank;
I. passing the eluate from the water tank through a filter membrane, placing the filter membrane under a microscope, measuring it at 50 x magnification using oblique incidence illumination, and counting according to the size classification given in table 1;
TABLE 1 evaluation of coating spalling index
J. Taking another four test sample blocks, and repeating the step A-I;
K. blank control tests were performed: the steps of A-I are the same as those of A-I except that a test sample block is not used;
l, respectively multiplying the number of particles of each size classification in the five test sample blocks by an evaluation coefficient, and adding the results to obtain the number N of coating falling particlesa＝na1·0.1+na2·0.2+n a35, recording the sum Va of the amounts of distilled water used in the five tests; multiplying the number of particles of each size classification in the blank control test by an evaluation coefficient respectively, and adding the results to obtain the particles N in the blank control testb＝nb1·0.1+nb2·0.2+n b35, recording the amount Vb of distilled water used for the blank control test; coating spallation index N ═ N (N)a-Nb÷Vb×Va)÷5。
The technical scheme of the invention is as follows: the range of F is 2-5N.
The technical scheme of the invention is as follows: and V is 200 mm/min.
Compared with the prior art, the medical catheter coating firmness testing method has the advantages that (1) the method for collecting and counting the falling coating particles in the liquid is introduced into the coating firmness testing field, the number and the size of the falling coating are quantized, the coating firmness condition is comprehensively and directly reflected, the condition that the coating falls off can only be qualitatively or indirectly reflected before is changed, in addition, the extremely small particles can be captured, the precision is high, and (2) the amount of the used distilled water has influence on the particle counting because the distilled water contains a few particles, in the step L, N is usedbVb is the index of particles introduced per unit volume of liquid, multiplied by Va is the total index of particles introduced for the total liquid volume of the first 5 tests, by the formula N ═ N (N)a-NbVb × Va 5, eliminates the influence of particles introduced by distilled water, ensures the test precision, and (3) adopts the test sample block with the same material as the medical catheter base material and the coating, not only ensures the test trueness, but also has easy processing and manufacturing and low cost.
Drawings
FIG. 1 is a perspective view of a catheter coating firmness testing machine according to an embodiment of the present invention.
FIG. 2 is a main sectional view of a catheter coating firmness testing machine according to the embodiment.
Fig. 3 is a sectional view taken along a-a in fig. 2.
Fig. 4 is a partially enlarged view of a portion B in fig. 3.
FIG. 5 is a reference diagram illustrating the operation of the catheter coating firmness testing machine according to the embodiment.
Fig. 6 is a partially enlarged view of a portion C in fig. 5.
FIG. 7 is a front cross-sectional view of a particle filter according to an embodiment.
FIG. 8 is an exploded perspective view of a particle filter according to one embodiment.
FIG. 9 is a perspective view of a housing according to an embodiment.
In the figure: 1. pressure testing machine, 2, clamp, 3, workbench, 4, water tank driving device, 5, water tank, 6, particle filter, 7, negative pressure device, 8, upper shell, 9, lower shell, 10, filter membrane, 11, bracket, 12, liquid inlet, 13, liquid outlet, 14, bucket, 15, horizontal arm, 16, vertical arm, 17, housing, 18, housing driving device, 19, upper washing nozzle, 20, lower washing nozzle, 21, notch, 22, heater, 23, base, 24, workbench driving device, 25, water injection pipe, 26, test sample block, 27, standard test block.
Detailed Description
The following examples are further illustrative of the present invention, but the present invention is not limited thereto. Because the present invention is relatively complex, the embodiments only detail the invention point of the present invention, and the parts not detailed in the present invention can adopt the prior art.
Example 1:
as shown in figures 1-9, a medical catheter coating firmness testing machine comprises a pressure testing machine 1 and a movable coating friction device.
The pressure testing machine 1 is provided with a clamp 2, the pressure testing machine 1 can drive the clamp 2 to vertically move and can control pressure, specifically, the clamp 2 is connected with the pressure testing machine 1 through an L-shaped arm frame, the L-shaped arm frame comprises a horizontal arm 15 and a vertical arm 16, the horizontal arm 15 is connected with the pressure testing machine 1, and the clamp 2 is arranged at the lower end of the vertical arm 16. the pressure testing machine 1 can adopt a tension and compression testing machine or a universal testing machine in the prior art, as shown in fig. 1, preferably, the pressure testing machine 1 adopts a single-column pressure testing machine in the prior art.
The worktable 3 is vertically slidably mounted on the base 23, and the worktable driving device 24 is used for driving the worktable 3 to vertically move relative to the base 23, as shown in fig. 2, the worktable driving device 24 in this embodiment is an electric push rod.
The movable coating friction device comprises a workbench 3, a water tank driving device 4, a water tank 5, a particle filter 6, a negative pressure device 7, a flushing device, a heater 22, a base 23, a workbench driving device 24 and a water injection pipe 25.
The water tank driving device 4 is installed on the workbench 3 and is used for driving the water tank 5 to move left and right relative to the workbench 3, and specifically, as shown in fig. 1 and 2, the water tank driving device 4 in this embodiment is a linear module.
And a standard test block mounting groove is formed in the water tank 5 and used for mounting a standard test block 27, and the standard test block mounting groove is positioned in the middle of the water tank 5.
As shown in fig. 4 and 6, hoppers 14 are provided at positions of the water tank 5 located at the front and rear sides of the standard test block mounting groove.
As shown in fig. 7 and 8, the particle filter 6 includes an upper casing 8, a lower casing 9, and a filter membrane 10, wherein a bracket 11 is disposed in the lower casing 9, and the filter membrane 10 is disposed on the bracket 11. The upper shell 8 is detachably mounted on the lower shell 9 in a buckling manner, and the embodiment can adopt threaded connection. The top of the upper shell 8 is provided with a liquid inlet 12, the bottom of the lower shell 9 is provided with a liquid outlet 13, and the bottom of the hopper 14 is connected with the particle filter 6 through a hose. The liquid outlet 13 is connected with a negative pressure device 7, and the negative pressure device 7 in this embodiment is a vacuum generator.
As shown in fig. 3 to 6, the flushing device includes two sets of flushing units symmetrically disposed at front and rear sides of the water tank 5, and the flushing units include a housing 17, a housing driving device 18, an upper flushing nozzle 19, and a lower flushing nozzle 20. The housing driving device 18 is used for driving the housing 17 to move back and forth relative to the workbench 3, and the housing driving device 18 in the embodiment is an electric push rod. The housing 17 of the two sets of the washing units can cover the top of the water tank 5, the upper and lower wash jets 19 and 20 are installed at the side of the housing 17 and the upper wash jet 19 is located above the lower wash jet 20, the upper wash jet 19 is directed obliquely upward, the lower wash jet 20 is directed obliquely downward, and the upper and lower wash jets 19 and 20 are connected to a distilled water source with a flow meter. As shown in fig. 9, the top of the housing 17 is provided with a notch 21 that mates with the vertical arm 16.
The heater 22 is arranged inside the water tank 5 and is used for providing the liquid in the water tank 5 with the temperature required by the test so as to simulate the temperature of a human body.
The water injection pipe 25 is installed on the work table 3, the water injection pipe 25 is a flexible pipe, and the water injection pipe 25 is connected with a distilled water source with a flow meter.
The embodiment also provides a testing method using the medical catheter coating firmness testing machine, and the testing needs to be performed in a clean environment, so that the interference of an external environment (including an air environment) on the testing is reduced as much as possible.
The medical catheter coating firmness testing method comprises the following steps of:
A. preparing test equipment, which comprises the medical catheter coating firmness testing machine, a test sample block 26 and a standard test block 27, wherein the test sample block 26 is a cuboid made of a catheter base material to be tested, the surface of the test sample block is coated with a coating, the standard test block 27 is a cuboid metal block, and distilled water is tertiary water; inspecting the standard test block 27 to ensure that the surface thereof is flat and smooth and has no particle attachment;
B. injecting distilled water into the water tank 5 through the water injection pipe 25, washing, and discharging the eluent through the hopper 14 and the particle filter 6 in sequence;
C. fixedly installing a standard test block 27 in a standard test block installation groove of a water tank 5, adding distilled water into the water tank 5 through a water injection pipe 25, and turning the water injection pipe 25 to one side after water injection is finished to prevent interference with the movement of the water tank 5;
D. installing a test sample block 26 on a pressure testing machine 1 through a clamp 2, driving the test sample block 26 to move through the pressure testing machine 1, so that the test sample block 26 is immersed below the liquid level of a water tank 5, and keeping for a time t;
E. driving the test sample block 26 to move by the compression testing machine 1, so that the bottom surface of the test sample block 26 is in contact with the standard test block 27, and the pressure value is F, wherein F is 3N;
F. keeping the test sample block 26 still, driving the water tank 5 to reciprocate N times along a horizontal direction at a speed V (200 mm/min) by the water tank driving device 4;
G. separating the test sample block 26 from the standard test block 27 by the pressure tester 1;
H. the cover casing 17 is driven by the cover casing driving device 18 to move inwards, the test sample block 26 and the clamp 2 are closed in the water tank 5, and then the upper washing spray nozzle 19 and the lower washing spray nozzle 20 spray distilled water, wherein the upper washing spray nozzle 19 is mainly used for washing the bottom surface of the test sample block 26, the lower washing spray nozzle 20 is mainly used for washing the standard test block 27, so that fallen coating particles are ensured to enter liquid in the water tank 1, and the cover casing 17 can prevent the fallen coating particles from being splashed out of the water tank 5;
I. the pneumatic negative pressure device 7 enables the eluent in the water tank 5 to pass through the particle filter 6, and the fallen coating particles are intercepted on the filter membrane 10; opening the particle filter 6, removing the filter membrane 10, placing the filter membrane 10 under a microscope, measuring it at 50 x magnification using oblique incidence illumination, and counting according to the size classification given in table 1;
TABLE 1 evaluation of coating spalling index
J. Taking another four test sample blocks 26, and repeating the step A-I;
K. blank control tests were performed: the steps of A-I are the same as those of A-I except that a test sample block is not used;
l, multiplying the number of particles in each size classification in the five test sample blocks 26 by an evaluation coefficient respectively, and adding the results to obtain the number N of coating shedding particlesa＝na1·0.1+na2·0.2+n a35, recording the sum Va of the amounts of distilled water used in the five tests; multiplying the number of particles of each size classification in the blank control test by an evaluation coefficient respectively, and adding the results to obtain the particles N in the blank control testb＝nb1·0.1+nb2·0.2+n b35, recording the amount Vb of distilled water used for the blank control test; coating spallation index N ═ N (N)a-Nb÷Vb×Va)÷5。
The larger the coating peeling index is, the more the peeling coating has influence on human body, and the more the peeling coating is unacceptable to be used.
Example two:
the embodiment provides a method for testing coating firmness of a medical catheter, which needs to be tested in a clean environment, so that the interference of an external environment (including an air environment) on the test is reduced as much as possible.
The medical catheter coating firmness testing method comprises the following steps of:
A. preparing a test device which comprises a water tank 5, a test sample block 26, a standard test block 27, distilled water and a filter membrane 10, wherein the test sample block 26 is a cuboid made of a base material of a conduit to be tested, a coating is coated on the surface of the test sample block, the standard test block 27 is a cuboid metal block, and the distilled water is tertiary water; inspecting the standard test block 27 to ensure that the surface thereof is flat and smooth and has no particle attachments;
B. washing the water tank 5 with distilled water, and discharging the eluate out of the water tank 5;
C. fixedly installing a standard test block 27 in the water tank 5, and adding distilled water into the water tank 5;
D. immersing the test sample block 26 below the liquid level of the water tank 5 and keeping the time t;
E. the bottom surface of the test piece 26 is brought into contact with the standard test piece 27 at a pressure value F of 3N;
F. the test sample block 26 is kept still, and the water tank 5 is reciprocated N times in a horizontal direction at a speed V, where V is 200 mm/min;
G. visually observing whether the liquid in the water tank 5, the side wall of the water tank 5, the standard experiment block 27, the test sample block 26, the part of the clamping 2 immersed in the liquid and the like have visible particles with naked eyes, and if the larger coating particles exist, independently taking out the particles and making a record; separating the test sample block 26 from the standard test block 27;
H. washing the test block 26 with distilled water to leave no macroscopic particles on its surface, ensuring that the eluate is collected in the water tank 5;
I. the eluate in the water tank 5 was passed through a filter membrane 10, the filter membrane 10 was placed under a microscope, and it was measured under 50 x magnification using oblique incidence illumination and counted in the size categories given in table 1;
TABLE 1 evaluation of coating spalling index
J. Taking another four test sample blocks 26, and repeating the step A-I;
K. blank control tests were performed: the steps of A-I are the same as those of A-I except that a test sample block is not used;
l, multiplying the number of particles in each size classification in the five test sample blocks 26 by an evaluation coefficient respectively, and adding the results to obtain the number N of coating shedding particlesa＝na1·0.1+na2·0.2+n a35, recording the sum Va of the amounts of distilled water used in the five tests; multiplying the number of particles of each size classification in the blank control test by an evaluation coefficient respectively, and adding the results to obtain the particles N in the blank control testb＝nb1·0.1+nb2·0.2+n b35, recording the amount Vb of distilled water used for the blank control test; coating spallation index N ═ N (N)a-Nb÷Vb×Va)÷5。
The larger the coating peeling index is, the more the peeling coating has influence on human body, and the more the peeling coating is unacceptable to be used.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (7)
1. The utility model provides a medical catheter coating firmness test machine which characterized in that: comprises a pressure tester (1) and a movable coating friction device; the pressure testing machine (1) is provided with a clamp (2), and the pressure testing machine (1) can drive the clamp (2) to vertically move and can control pressure; the movable coating friction device comprises a workbench (3), a water tank driving device (4), a water tank (5), a particle filter (6) and a negative pressure device (7); the water tank driving device (4) is arranged on the workbench (3) and is used for driving the water tank (5) to move left and right relative to the workbench (3); the device is characterized in that a standard test block mounting groove is formed in the water tank (5), the bottom of the water tank (5) is connected with a particle filter (6) through a hose, and the particle filter (6) is connected with a negative pressure device (7).
2. The medical catheter coating firmness testing machine of claim 1, wherein: the particle filter (6) comprises an upper shell (8), a lower shell (9) and a filter membrane (10), a bracket (11) is arranged in the lower shell (9), the filter membrane (10) is arranged on the bracket (11), and the upper shell (8) is detachably buckled on the lower shell (9); go up the top of casing (8) and be equipped with inlet (12), the bottom of casing (9) is equipped with liquid outlet (13) down, the bottom of water tank (5) is passed through the hose and is connected with inlet (12), liquid outlet (13) are connected with negative pressure device (7).
3. The medical catheter coating firmness testing machine of claim 1, wherein: the standard test block mounting groove is located in the middle of the water tank (5), a hopper (14) is arranged at the front side and the rear side of the standard test block mounting groove in the water tank (5), and the bottom of the hopper (14) is connected with the particle filter (6) through a hose.
4. The medical catheter coating firmness testing machine according to claim 1, wherein the clamp (2) is connected with the compression testing machine (1) through an L-shaped arm support, the L-shaped arm support comprises a horizontal arm (15) and a vertical arm (16), the clamp (2) is arranged at the lower end of the vertical arm (16), the movable coating friction device further comprises a flushing device, the flushing device comprises two groups of flushing units symmetrically arranged at the front side and the rear side of the water tank (5), each flushing unit comprises a housing (17), a housing driving device (18), an upper flushing nozzle (19) and a lower flushing nozzle (20), the housing driving device (18) is used for driving the housing (17) to move back and forth relative to the workbench (3), the housings (17) of the two groups of flushing units can cover the top of the water tank (5), the upper flushing nozzle (19) and the lower flushing nozzle (20) are arranged at the side of the housing (17), the upper flushing nozzle (19) and the upper flushing nozzle (19) are located above the lower flushing nozzle (20), the upper flushing nozzle (19) faces upward and the upper flushing nozzle (19) and the lower flushing nozzle (20) is connected with a water source (21) and a water source, and the lower flushing flow meter (16) is arranged below the upper flushing nozzle (19) and the lower flushing flow meter.
5. A medical catheter coating firmness testing method comprises the following steps:
A. preparing test equipment, which comprises a water tank (5), a test sample block (26), a standard test block (27), distilled water and a filter membrane (10); inspecting the standard test block (27) to ensure that the surface thereof is flat and smooth and has no particle attachment;
B. washing the water tank (5) with distilled water, and discharging the eluate out of the water tank (5);
C. fixedly installing a standard test block (27) in a water tank (5), and adding distilled water into the water tank (5);
D. immersing the test sample block (26) below the liquid level of the water tank (5) and keeping the time t;
E. contacting the bottom surface of the test sample block (26) with a standard test block (27) at a pressure value of F;
F. keeping the test sample block (26) stationary and reciprocating the water tank (5) at a speed V in a horizontal direction for N times;
G. separating the test sample block (26) from the standard test block (27);
H. washing the test block (26) with distilled water to leave no macroscopic particles on its surface, ensuring that the eluate is collected in the water tank (5);
I. passing the eluate from the water reservoir (5) through a filter membrane (10), placing the filter membrane (10) under a microscope, measuring it at 50 x magnification using oblique incidence illumination, and counting it according to the size classification given in table 1;
TABLE 1 evaluation of coating spalling index
J. Taking another four test sample blocks (26), and repeating the step A-I;
K. blank control tests were performed: the steps of A-I are the same as those of A-I except that a test sample block is not used;
l, multiplying the number of particles in each size classification in the five test sample blocks (26) by an evaluation coefficient, and adding the results to obtain the number N of coating shedding particlesa＝na1·0.1+na2·0.2+na35, recording the sum Va of the amounts of distilled water used in the five tests; multiplying the number of particles of each size classification in the blank control test by an evaluation coefficient respectively, and adding the results to obtain the particles N in the blank control testb＝nb1·0.1+nb2·0.2+nb35, recording the amount of distilled water Vb used for the blank control test; coating spallation index N ═ N (N)a-Nb÷Vb×Va)÷5。
6. The medical catheter coating firmness test method according to claim 5, wherein: the range of F is 2-5N.
7. The medical catheter coating firmness test method according to claim 5 or 6, wherein: and V is 200 mm/min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109388A (en) * | 2021-04-14 | 2021-07-13 | 湖南菁益医疗科技有限公司 | Method for detecting temperature resistance failure of electrode coating in electrosurgery |
| CN113916766A (en) * | 2021-11-11 | 2022-01-11 | 中车长春轨道客车股份有限公司 | Coating sand wind resistance testing arrangement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070281032A1 (en) * | 2006-06-06 | 2007-12-06 | Hsu-Wei Fang | Method for generating polymeric wear particles |
| CN204269497U (en) * | 2014-12-01 | 2015-04-15 | 江苏凤凰电气股份有限公司 | A kind of coat of metal wear resistance testing device |
| CN205109410U (en) * | 2015-11-30 | 2016-03-30 | 广州丽格打印耗材有限公司 | Ink suction filter |
| CN106370595A (en) * | 2016-11-03 | 2017-02-01 | 合肥波林复合材料有限公司 | High-pressure water jet testing machine |
| CN108507941A (en) * | 2018-03-27 | 2018-09-07 | 苏州桓晨医疗科技有限公司 | A kind of detection method of polymeric coating layer fastness |
-
2020
- 2020-06-11 CN CN202010532016.2A patent/CN111504900B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070281032A1 (en) * | 2006-06-06 | 2007-12-06 | Hsu-Wei Fang | Method for generating polymeric wear particles |
| CN204269497U (en) * | 2014-12-01 | 2015-04-15 | 江苏凤凰电气股份有限公司 | A kind of coat of metal wear resistance testing device |
| CN205109410U (en) * | 2015-11-30 | 2016-03-30 | 广州丽格打印耗材有限公司 | Ink suction filter |
| CN106370595A (en) * | 2016-11-03 | 2017-02-01 | 合肥波林复合材料有限公司 | High-pressure water jet testing machine |
| CN108507941A (en) * | 2018-03-27 | 2018-09-07 | 苏州桓晨医疗科技有限公司 | A kind of detection method of polymeric coating layer fastness |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109388A (en) * | 2021-04-14 | 2021-07-13 | 湖南菁益医疗科技有限公司 | Method for detecting temperature resistance failure of electrode coating in electrosurgery |
| CN113916766A (en) * | 2021-11-11 | 2022-01-11 | 中车长春轨道客车股份有限公司 | Coating sand wind resistance testing arrangement |
| CN113916766B (en) * | 2021-11-11 | 2023-08-04 | 中车长春轨道客车股份有限公司 | Device for testing wind and sand resistance of coating |
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