CN212364034U - Medical catheter coating firmness testing machine - Google Patents
Medical catheter coating firmness testing machine Download PDFInfo
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- CN212364034U CN212364034U CN202021092063.1U CN202021092063U CN212364034U CN 212364034 U CN212364034 U CN 212364034U CN 202021092063 U CN202021092063 U CN 202021092063U CN 212364034 U CN212364034 U CN 212364034U
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Abstract
The utility model relates to the field of medical instrument quality inspection, 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 the 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 utility model discloses an automatic friction test of medical catheter coating test sample piece and collect the coating particle that drops and count in liquid can catch little coating that drops, and good repeatability has improved test speed and measuring accuracy.
Description
Technical Field
The utility model relates to a medical instrument quality inspection field specifically is a medical catheter coating firmness test machine.
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 the medical catheter with a coating by using a surface modification technique is a common technique. 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 falling 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 the feeling of a tester, the randomness is high, and the testing precision is low; (3) the testing efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the not enough of above-mentioned prior art, provide a medical catheter coating firmness test machine to realize the friction test of automatic medical catheter coating test sample piece and collect the coating particle that drops and count in liquid, can catch little coating that drops, good repeatability improves test speed and measuring accuracy.
The utility model discloses the technical problem that will solve adopts following technical scheme to realize: a medical catheter coating firmness testing machine comprises a pressure testing machine and a movable coating friction device; the pressure testing machine is provided with a clamp, and 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, a negative pressure device, a heater, a base, a workbench driving device and a water injection pipe; the workbench is vertically and slidably arranged on the base, and the workbench driving device is used for driving the workbench to vertically move relative to the base; 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; a standard test block mounting groove is formed in the water tank, and the heater is arranged inside 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 water injection pipe is installed on the workbench and is a flexible pipe, and the water injection pipe is connected with a distilled water source with a flowmeter.
The technical proposal of the utility model is also that: 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 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 proposal of the utility model is also that: the standard test block mounting groove is located in the middle of the water tank, hoppers are arranged at the front side and the rear side of the standard test block mounting groove in the water tank, 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 proposal of the utility model is also that: the clamp is connected with the compression testing machine through an L-shaped arm support, the L-shaped arm support comprises a horizontal arm and a vertical arm, and the clamp 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 the 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 the workbench, the housings of the two groups of flushing units can cover the top of the water tank, the upper flushing sprayer and the lower flushing sprayer are arranged on the side part of the housing, the upper flushing sprayer is located above the lower flushing sprayer, the upper flushing sprayer faces to the obliquely upper side, the lower flushing sprayer faces to the obliquely lower side, and the upper flushing sprayer and the lower flushing sprayer are both connected with a distilled water source with a flow meter; and a notch matched with the vertical arm is formed in the top of the housing. By adopting the technical scheme, after the friction movement is finished, the pressure testing machine drives the test sample block to move upwards for a certain distance, the housing driving device drives the housing to seal the test sample block and the clamp in the water tank, and then the upper washing spray head and the lower washing spray head spray distilled water, wherein the upper washing spray head is mainly used for washing the bottom surface of the test sample block, the lower washing spray head is mainly used for washing the standard test block, so that the fallen coating particles are ensured to enter the liquid in the water tank, and the housing can prevent the fallen coating particles from being splashed out of the water tank; the flowmeter is used for counting the water injection amount.
Compared with the prior art, the utility model discloses medical catheter coating firmness test machine's beneficial effect does: (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; (4) the heater can provide the temperature required by the test for the liquid in the water tank so as to simulate the temperature of a human body; (5) the height of the workbench can be adjusted through the workbench driving device so as to adapt to the height of the pressure testing machine or the height of a tester; (6) the water injection pipe is used for water injection in to the water tank, and the water injection back of finishing can move away the water injection pipe to prevent interfering the removal of water tank, the flowmeter is used for statistics water injection volume.
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 of the utility model discloses it is more complicated, therefore embodiment is only right the utility model discloses a point part carries out the detail, the utility model discloses the part of not detail all can adopt 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.
Install anchor clamps 2 on compression testing machine 1, compression testing machine 1 can drive 2 vertical movements of anchor clamps and can controlled pressure, and is specific, anchor clamps 2 are connected with compression testing machine 1 through L shape cantilever crane, L shape cantilever crane includes horizontal arm 15 and vertical arm 16, horizontal arm 15 is connected with compression testing machine 1, anchor clamps 2 establish the lower extreme at vertical arm 16. Compression testing machine 1 can adopt the tension and compression testing machine or universal tester among the prior art, as shown in figure 1, it is preferred, the utility model discloses a compression testing machine 1 adopts the single-column compression testing machine among 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, the water tank driving device 4 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. Go up 8 detachable lock installations of casing on lower casing 9, this 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 bucket 14 is connected with the particle filter 6 through a hose. The liquid outlet 13 is connected with the 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 cover 17 of the two sets of the washing units can cover the top of the water tank 5, the upper and lower wash sprayers 19 and 20 are installed at the side of the cover 17 and the upper wash sprayer 19 is located above the lower wash sprayer 20, the upper wash sprayer 19 is directed obliquely upward, the lower wash sprayer 20 is directed obliquely downward, and the upper and lower wash sprayers 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 attachments;
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 mounting a standard test block 27 in a standard test block mounting 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 sealed 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 falling coating particles are ensured to enter liquid in the water tank 1, and the cover casing 17 can prevent the falling 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 of distilled water Vb 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 without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (4)
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), a negative pressure device (7), a heater (22), a base (23), a workbench driving device (24) and a water injection pipe (25); the workbench (3) is vertically and slidably arranged on the base (23), and the workbench driving device (24) is used for driving the workbench (3) to vertically move relative to the base (23); 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); a standard test block mounting groove is formed in the water tank (5), and the heater (22) is arranged inside 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); the water injection pipe (25) is installed on the workbench, the water injection pipe (25) is a flexible pipe, and the water injection pipe (25) is connected with a distilled water source with a flowmeter.
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 of 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), and the clamp (2) is arranged at the lower end of the vertical arm (16); the friction device with the movable coating also comprises a flushing device, the flushing device comprises two groups of flushing units which are symmetrically arranged at the front side and the rear side of the water tank (5), the 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 and lower washing nozzles (19, 20) are installed at the side of the housing (17) and the upper washing nozzle (19) is located above the lower washing nozzle (20), the upper washing spray head (19) faces to the upper direction, the lower washing spray head (20) faces to the lower direction, the upper washing spray head (19) and the lower washing spray head (20) are both connected with a distilled water source with a flow meter; the top of the housing (17) is provided with a notch (21) matched with the vertical arm (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092063.1U CN212364034U (en) | 2020-06-11 | 2020-06-11 | Medical catheter coating firmness testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092063.1U CN212364034U (en) | 2020-06-11 | 2020-06-11 | Medical catheter coating firmness testing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212364034U true CN212364034U (en) | 2021-01-15 |
Family
ID=74154183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021092063.1U Expired - Fee Related CN212364034U (en) | 2020-06-11 | 2020-06-11 | Medical catheter coating firmness testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212364034U (en) |
-
2020
- 2020-06-11 CN CN202021092063.1U patent/CN212364034U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210115 |