Puncture outfit insertion and extraction force testing device

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a puncture outfit insertion and extraction force testing device. The utility model provides a puncture outfit insertion and extraction force testing device, which aims at solving the problem that in the prior art, insertion and extraction force of a puncture outfit needs to be provided in cooperation with a universal testing machine, and comprises a needle rod fixing device for fixing a needle rod and a sleeve fixing device for fixing a sleeve, the needle rod fixing device is connected to the upper section of the universal testing machine through the linear driving mechanism, the sleeve fixing device is fixedly connected to the lower section of the universal testing machine, and the linear driving mechanism can drive the needle rod fixing device to move in the vertical direction and enable a needle rod to penetrate into a sleeve or be pulled out of the sleeve. And the counter-acting force of the sleeve to the needle rod is transmitted to the universal tester sensor through the needle rod fixing device, so that the pulling and inserting force is measured. The device has the advantages of being simple in structure, easy to disassemble and assemble and capable of being flexibly adjusted according to the specification of the puncture outfit.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a puncture device insertion and extraction force testing device. Background Art

[0002] Laparoscopic surgery is the mainstream of minimally invasive surgery and has broad development prospects in the future. In laparoscopic surgery, the resistance of the puncture needle insertion and withdrawal cannula affects the doctor's experience and the smoothness of the operation. Therefore, it is necessary to test the insertion and withdrawal force of the puncture product before it leaves the factory to confirm the reliability of the product.

[0003] The universal testing machine is an instrument used for mechanical property testing. It is commonly found in laboratories of various manufacturers. The instrument can be used to measure the mechanical properties of products by fixing the products to be tested using fixtures corresponding to different products.

[0004] For example, a Chinese utility model patent discloses a disposable abdominal puncture device insertion and extraction performance evaluation experimental fixture [application number: CN202120562610.6]. The utility model includes a clamping table, which is a cylindrical structure, with a boss arranged on the upper part of the clamping table, and an annular groove is arranged on the upper side of the clamping table. The utility model directly installs the adjustment device of the clamping block on the clamping table, and the user can synchronously drive the three wedge blocks to rotate by rotating the fixing ring. The three wedge blocks synchronously drive the three clamping blocks to slide toward the inner side of the plug-in hole by the cooperation of the first inclined surface and the second inclined surface, thereby clamping the sleeve. No additional tools are required in the whole process, which avoids the loss of tools and the impact of tool loss on the experiment.

[0005] Although the utility model has the function of clamping the puncture device sleeve, it still cannot play a good coordination role in the process of inserting and removing the puncture rod, and its compatibility with the universal testing machine is also poor. Utility Model Content

[0006] The purpose of the utility model is to provide a puncture device insertion and extraction force testing device in view of the above problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a puncture device insertion and extraction force testing device, comprising a needle rod fixing device for fixing a needle rod and a sleeve fixing device for fixing a sleeve, the needle rod fixing device is connected to the upper section of a universal testing machine through a linear drive mechanism, and the sleeve fixing device is fixedly connected to the lower section of the universal testing machine, and the linear drive mechanism can drive the needle rod fixing device to move in a vertical direction and make the needle rod pierce into the sleeve or be pulled out of the sleeve.

[0009] In the puncture insertion and extraction force testing device as described above, the sleeve fixing device includes a fixing plate with a sleeve passage hole and a sleeve locking assembly arranged on the fixing plate, and the sleeve is fixed on the fixing plate by the sleeve locking assembly.

[0010] In the puncture insertion and extraction force testing device as described above, the sleeve locking assembly includes a plurality of positioning seats fixedly connected to the fixed plate, the positioning pins are inserted into the positioning seats and the sleeve is moved at this time, and the sleeve interferes with the positioning pins.

[0011] In the puncture insertion and extraction force testing device as described above, the sleeve includes a sleeve body and a positioning ear fixedly connected to the sleeve body, the positioning ear and the sleeve body are combined to form a positioning through hole, and the positioning pin passes through the positioning through hole.

[0012] In the puncture insertion and extraction force testing device as described above, two positioning ears are provided and symmetrically connected to the two sides of the sleeve body, and the positioning seats form a group of two, each group of positioning seats is provided with a positioning pin, and the two groups of positioning seats are respectively located on the two sides of the sleeve body.

[0013] As described above, a puncture device insertion and extraction force testing device, the bottom surface of the fixing plate of the sleeve fixing device is fixedly connected to a accommodating structure for accommodating the sleeve channel, the accommodating structure includes a support and a sleeve bottom plate, the upper surface of the sleeve bottom plate is provided with a sleeve accommodating hole that does not completely penetrate the sleeve bottom plate, the bottom is welded and fixed with a lower splint, and the lower splint is connected to the lower section of the universal testing machine.

[0014] In the trocar insertion and extraction force testing device as described above, the sleeve bottom plate and the fixing plate both have corresponding pillar accommodating holes, and the pillars are detachably connected between the fixing plate and the sleeve bottom plate through the pillar accommodating holes.

[0015] In the trocar insertion and extraction force testing device as described above, the center of the sleeve accommodating hole and the center of the sleeve channel hole are located on the same straight line.

[0016] In the above-mentioned puncture device insertion and extraction force testing device, the needle bar fixing device includes a needle bar top plate and a needle bar bottom plate, the needle bar top plate and the needle bar bottom plate have screw holes of the same specifications and are connected by bolts. The needle bar top plate is welded and fixed with an upper clamping plate, which is connected to the linear drive mechanism; the needle bar bottom plate is provided with a U-shaped needle bar positioning groove, and the horizontal symmetry axis of the U-shaped needle bar positioning groove intersects with the straight line where the center of the sleeve receiving hole and the sleeve passage hole is located.

[0017] The puncture device insertion and extraction force testing device as described above is characterized in that the needle rod base plate also includes a clamping pin hole for accommodating the clamping pin of the needle rod head.

[0018] Compared with the existing technology, the advantages of the utility model are:

[0019] 1. The puncture insertion and extraction force test device provided by the utility model adopts a structure that cooperates with a universal testing machine. The universal testing machine driving mechanism can be used to perform the insertion and extraction operations between the puncture needle rod and the cannula. The force exerted on the puncture needle rod can be continuously and accurately transmitted to the universal testing machine sensing device to obtain reliable insertion and extraction force test data.

[0020] 2. The utility model utilizes the upper and lower positioning structures matched with the universal testing machine to relatively position the trocar needle rod and the cannula, thereby improving the insertion and extraction accuracy of the trocar needle rod relative to the cannula.

[0021] 3. The unique fixing device of the puncture cannula of the utility model reduces the risk of experimental equipment being broken due to excessive clamping force of the traditional clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the working state structure of the utility model;

[0023] Figure 2 for Figure 1 Exploded view (without trocar);

[0024] Figure 3 It is a schematic diagram of the main structure of the utility model;

[0025] Figure 4 It is a working schematic diagram of the sleeve locking assembly;

[0026] In the figure: needle bar a, sleeve b, sleeve body b1, positioning ear b2, positioning through hole b3, needle bar fixing device 1, sleeve fixing device 2, accommodating structure 3, universal testing machine 4, needle bar top plate 11, needle bar bottom plate 12, screw hole 13, fixing plate 21, sleeve locking assembly 22, pillar 31, sleeve bottom plate 32, linear drive mechanism 41, pillar accommodating hole 33, upper clamping plate 111, U-shaped needle bar positioning groove 121, clamping foot hole 122, sleeve channel hole 211, positioning seat 221, positioning pin 222, sleeve accommodating hole 321, lower clamping plate 322. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] The utility model is a puncture device insertion and extraction force testing device. Figure 3 As shown, the main body of the testing device includes a needle rod fixing device 1, a sleeve fixing device 2, and a containing structure 3.

[0029] The utility model, when used, Figure 1-2As shown, when working, the main body of the device is clamped and fixed to the upper and lower ends of the universal testing machine 4 through the upper clamping plate 111 set on the needle bar top plate 11 of the needle bar fixing device 1 and the lower clamping plate 322 under the sleeve bottom plate 32 of the accommodating structure 3. When testing, the linear drive mechanism 41 of the universal testing machine 4 is operated to drive the needle bar a fixed by the fixing device 1 to move up and down, and the sleeve b is plugged in and out. The reaction force of the sleeve b on the needle bar a is transmitted to the fixing device 1 in real time through the needle bar a, and then transmitted to the sensor of the universal testing machine 4 (not shown in the figure) through the upper clamping plate 111, thereby realizing the accurate measurement of the plugging and pulling force performance.

[0030] like Figure 3-4 As shown, preferably, the needle bar a is fixed by the same-specification screw holes 13 of the needle bar top plate 11 and the needle bar bottom plate 12 in combination with bolts. The needle bar bottom plate 12 is provided with a foot hole 122 for accommodating the foot of the needle bar head; the sleeve b is provided with a positioning ear b2 located on the left and right of the sleeve body b1, and the fixed plate 21 is provided with a sleeve locking assembly 22 composed of a positioning seat 221 with a pin hole and a positioning pin 222 around it; the pin hole on the positioning seat 221 before and after the sleeve b and the gap between the sleeve body b1 and the positioning ear b2 form a positioning through hole b3; during installation, the positioning pin 222 penetrates into the positioning through holes b3 on both sides to achieve the fixation of the left and right sides of the puncture sleeve b, and the positioning seat 221 acts as a baffle to achieve the fixation of the front and back of the puncture sleeve b.

[0031] A support receiving hole 33 is provided below the fixing plate 21 , and is connected to a cannula bottom plate 32 which is also provided with the support receiving hole 33 via support pillars 31 , so as to form a receiving structure 3 for receiving a cannula instrument channel.

[0032] Preferably, the support 31 can be selected in different specifications to adapt to the different sizes of the sleeve b; similarly, the bolts for fixing the needle rod a can also be selected in different specifications to adapt to the size of the head of the needle rod a.

[0033] During manufacturing, the relative positioning of the upper clamping plate 111 and the U-shaped needle rod positioning groove 121, and the relative positioning of the center of the sleeve accommodating hole 321 and the lower clamping plate 322 are measured, so that the center of the sleeve accommodating hole 321 and the center of the sleeve channel hole 211 are located on the same straight line, and the straight line passes through the symmetry axis of the U-shaped needle rod positioning groove 121. In this way, after the main structure of the puncture device insertion and extraction force test device is correctly installed on the universal testing machine 4, the needle rod a can be accurately inserted into the sleeve b.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although this article uses more terms such as needle bar a, sleeve b, sleeve body b1, positioning ear b2, positioning through hole b3, needle bar fixing device 1, sleeve fixing device 2, accommodating structure 3, universal testing machine 4, needle bar top plate 11, needle bar bottom plate 12, screw hole 13, fixing plate 21, sleeve locking assembly 22, pillar 31, sleeve bottom plate 32, linear drive mechanism 41, pillar accommodating hole 33, upper clamping plate 111, U-shaped needle bar positioning groove 121, clamping foot hole 122, sleeve passage hole 211, positioning seat 221, positioning pin 222, sleeve accommodating hole 321, lower clamping plate 322, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A trocar insertion and extraction force testing device, characterized in that: The invention comprises a needle bar fixing device (1) for fixing a needle bar (a) and a sleeve fixing device (2) for fixing a sleeve (b); the needle bar fixing device (1) is connected to the upper section of a universal testing machine (4) via a linear drive mechanism (41); the sleeve fixing device (2) is fixedly connected to the lower section of the universal testing machine (4); the linear drive mechanism (41) can drive the needle bar fixing device (1) to move in a vertical direction and cause the needle bar (a) to penetrate into the sleeve (b) or be pulled out of the sleeve (b).

2. The puncture insertion and extraction force testing device according to claim 1, characterized in that: The sleeve fixing device (2) comprises a fixing plate (21) provided with a sleeve passage hole (211) and a sleeve locking assembly (22) arranged on the fixing plate (21), and the sleeve (b) is fixedly arranged on the fixing plate (21) by the sleeve locking assembly (22).

3. A trocar insertion and extraction force testing device as claimed in claim 2, characterized in that: The sleeve locking assembly (22) comprises a plurality of positioning seats (221) fixedly connected to the fixed plate (21), and positioning pins (222) are inserted into the positioning seats (221) and when the sleeve (b) is moved, the sleeve (b) interferes with the positioning pins (222).

4. A trocar insertion and extraction force testing device as claimed in claim 3, characterized in that: The sleeve (b) comprises a sleeve body (b1) and a positioning ear (b2) fixedly connected to the sleeve body (b1); the positioning ear (b2) and the sleeve body (b1) are combined to form a positioning through hole (b3); and the positioning pin (222) passes through the positioning through hole (b3).

5. A trocar insertion and extraction force testing device as claimed in claim 4, characterized in that: The positioning ears (b2) are provided with two and are symmetrically connected on both sides of the sleeve body (b1); the positioning seats (221) are grouped in pairs, and a positioning pin (222) is passed through each group of positioning seats (221); the two groups of positioning seats (221) are respectively located on both sides of the sleeve body (b1).

6. A trocar insertion and extraction force testing device as claimed in claim 2, characterized in that: The bottom surface of the fixing plate (21) of the sleeve fixing device (2) is fixedly connected to a containing structure (3) for containing a sleeve channel, the containing structure (3) comprising a support (31) and a sleeve bottom plate (32), the upper surface of the sleeve bottom plate (32) having a sleeve containing hole (321) that does not completely penetrate the sleeve bottom plate (32), the bottom of which is welded and fixed with a lower clamping plate (322), the lower clamping plate (322) being connected to the lower section of the universal testing machine (4).

7. A trocar insertion and extraction force testing device according to claim 6, characterized in that: The sleeve bottom plate (32) and the fixed plate (21) are both provided with corresponding pillar receiving holes (33), and the pillars (31) are detachably connected between the fixed plate (21) and the sleeve bottom plate (32) through the pillar receiving holes (33).

8. A trocar insertion and extraction force testing device according to claim 7, characterized in that: The center of the sleeve accommodating hole (321) and the center of the sleeve passage hole (211) are located on the same straight line.

9. A trocar insertion and extraction force testing device according to claim 1, characterized in that: The needle bar fixing device (1) comprises a needle bar top plate (11) and a needle bar bottom plate (12), wherein the needle bar top plate (11) and the needle bar bottom plate (12) have screw holes (13) of the same specification and are connected by bolts; an upper clamping plate (111) is welded and fixed to the needle bar top plate (11), and the upper clamping plate (111) is connected to a linear drive mechanism (41); a U-shaped needle bar positioning groove (121) is formed on the needle bar bottom plate (12), and the horizontal symmetry axis of the U-shaped needle bar positioning groove (121) intersects with a straight line where the centers of the sleeve accommodating hole (321) and the sleeve passage hole (211) are located.

10. A trocar insertion and extraction force testing device according to claim 9, characterized in that: The needle bar bottom plate (12) also includes a foot hole (122) for accommodating the foot of the needle bar (a) head.

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