Medical catheter testing equipment

Abstract

The present invention relates to the field of medical device testing equipment, specifically a medical catheter testing equipment, including a base, a lower clamp and an upper clamp are provided on the base, the upper clamp and the lower clamp include an elastic expansion sleeve, a balanced expansion core and a force-applying component, the elastic expansion sleeve includes an end cover and a plurality of expansion blocks, the outer wall of each expansion block forms a cylindrical surface, the inner wall of each expansion block forms an inner conical surface, the outer wall of the balanced expansion core is an outer conical surface, the outer circumference of the end cover is connected with a plurality of clips, the middle part of the clips is concave and close to the outer wall of the expansion block; the balanced expansion core is penetrated by a through hole, a connecting tube and a half-cut tube are movably provided in the through hole, the opposite end of the half-cut tube is connected with a half-cut conical part, and the opposite end of the through hole is provided with a conical chamfer. The present invention realizes the expansion and tightening effect on the catheter, the elastic expansion sleeve includes a clip to realize the pre-clamping of the catheter, the plugging is labor-saving and fast, and the half-cut tube can be automatically opened and water / air can be passed when the elastic expansion sleeve is expanded, and the half-cut tube is automatically closed when the elastic expansion sleeve is loosened.

Description

Technical Field

[0001] The invention relates to the field of medical device testing equipment, in particular to a medical catheter testing equipment. Background Art

[0002] Medical catheters are flexible tubes used for guidance, insertion or drainage in medical diagnosis and treatment. They are usually made of medical grade plastic or rubber materials. After production, such catheters need to be subjected to bending fatigue tests to meet the medical requirements of catheters.

[0003] When the existing catheter is subjected to bending fatigue test, the empty tube is directly fixed and tested, while the catheter in clinical use has liquid inside, so the empty tube test is different from the state of the catheter in clinical use. For example, the Chinese invention patent with announcement number CN117030492B discloses a medical catheter test device, which is connected to a constant pressure water pump and can perform bending fatigue tests in various directions, which is more in line with reality. However, in this test device, one end of the catheter needs to be connected to the constant pressure water pump by plugging and unplugging, and the other end is fixed by a clamping mechanism. On the one hand, a loose connection is easy to fall off the tube during testing, and a tight connection is laborious; on the other hand, for some catheters with a certain toughness, it is easy to cause the clamping mouth to be concave and cracked when it is clamped and fixed, and it is difficult to achieve the effect of clamping and waterproofing, so this fixing method has certain defects. Summary of the invention

[0004] The object of the present invention is to provide a medical catheter testing device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a medical catheter testing device, comprising a base, a lower clamp and a first column-type screw rod are provided on the base, a first nut is provided on the first screw rod, an upper clamp is provided on the first nut, the upper clamp and the lower clamp comprise elastic expansion sleeves arranged opposite to each other and for the catheter port to be inserted, a balancing expansion core inserted in the elastic expansion sleeve and used to expand the elastic expansion sleeve, and a force-applying component for driving the balancing expansion core to move vertically relative to the elastic expansion sleeve, the elastic expansion sleeve comprises an axially fixed and annular end cover and a plurality of expansion blocks uniformly arranged and connected along the inner circumference of the end cover, a cutting seam is provided between two adjacent expansion blocks, the outer wall of each expansion block forms a cylindrical surface, the inner wall of each expansion block forms an inner conical surface, the outer wall of the balancing expansion core is an outer conical surface, and the outer conical surface and the inner conical surface are connected to each other. The conical surfaces cooperate with each other, and a plurality of clip petals are evenly arranged and connected in the outer circumference of the end cover, the middle part of the clip petals is concave and close to the outer wall of the expansion block, and a sleeve clamping area is formed between the clip petals and the elastic expansion sleeve; the balanced expansion core is axially penetrated with a through hole, and a connecting pipe is movably arranged in the through hole, and the facing ends of the connecting pipes in the two balanced expansion cores are connected with two half-sectioned tubes, and the facing ends of the half-sectioned tubes in the two balanced expansion cores are connected with half-sectioned conical parts, and the facing ends of the through holes in the two balanced expansion cores are provided with conical chamfers, and the half-sectioned conical parts cooperate with the conical chamfers; when the balanced expansion core moves vertically relative to the elastic expansion sleeve and expands the elastic expansion sleeve, the two half-sectioned tubes extend out of the conical chamfers and are in an open state; when the balanced expansion core moves vertically relative to the elastic expansion sleeve and releases the elastic expansion sleeve, the two half-sectioned tubes are embedded in the conical chamfers and are in a closed state.

[0006] Optionally, a horizontally distributed clamp platform is connected to the first nut, a mounting hole is formed on the clamp platform, and the end cover is fixed in the mounting hole; the force-applying component is a cylinder, the cylinder is mounted on the clamp platform via a first bracket, and the output end of the cylinder is connected to the balancing expansion core.

[0007] Optionally, a second column-type screw rod is provided on the base, a second nut is provided on the second screw rod, a bending pipe test mechanism is provided on the second nut, and the bending pipe test mechanism includes a vertically distributed test platform, an upper wire guide wheel group and a lower wire guide wheel group are fixedly provided on the test platform, and a left wire guide wheel and a right wire guide wheel are provided for horizontal sliding, and the left wire guide wheel and the right wire guide wheel are staggered in height.

[0008] Optionally, horizontally distributed and highly staggered guide grooves are provided on both sides of the test platform, a movable frame is slidably fitted in the guide groove, the left guide wheel / right guide wheel is installed on the movable frame, an adjusting screw is horizontally rotatably arranged in the guide groove, and the movable frame is threadedly connected to the adjusting screw.

[0009] Optionally, the lower end of the connecting tube located on the lower clamp is the water inlet / air outlet, and the upper end of the connecting tube located on the upper clamp is the water outlet / air inlet; the inner circle of the end cover is provided with a circle of sealing ring.

[0010] Optionally, a second bracket in a U-shape is connected to the side of the first bracket facing the connecting tube, a cross plate is connected to the middle of the second bracket, the connecting tube passes through the second bracket and the cross plate, a positioning plate is fixedly sleeved on the connecting tube, the positioning plate is arranged between the second bracket and the cross plate, and a spring is squeezed between the positioning plate and the second bracket.

[0011] Optionally, a plurality of push pieces distributed along the axial direction are fixedly connected to the outer wall of one end of the balancing expansion core away from the conical chamfer, the push pieces penetrate the end cover and are slidably arranged, and the inner wall of the push piece is arranged to fit the outer wall of the expansion block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention adopts an axially fixed elastic expansion sleeve and cooperates with a balanced expansion core to achieve the expansion and tightening effect on the catheter. The elastic expansion sleeve includes a clamping flap to achieve pre-clamping of the catheter, which saves effort and is fast to plug in. A connecting pipe and a half-cut pipe are arranged in the middle of the smooth expansion core, which can automatically open the half-cut pipe and pass water / air when the elastic expansion sleeve is expanded, and automatically close the half-cut pipe when the elastic expansion sleeve is released;

[0014] 2. In the present invention, a push piece is fixedly connected to the outer wall of the balancing expansion core, which passes through the end cover and can fit the outer wall of the expansion block. When the balancing expansion core moves toward the elastic expansion sleeve, it can not only loosen the elastic expansion sleeve, but also push the end of the catheter to assist in moving out of the sleeve clamping area through the push piece. The push piece can also push the expansion block to avoid its elasticity weakening or failure causing a flared state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the present invention from a first viewing angle;

[0016] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0017] Figure 3 for Figure 1 Enlarged view of part A in the middle;

[0018] Figure 4 for Figure 2 Enlarged view of middle part B;

[0019] Figure 5 It is a half-section structural diagram of the upper clamp and the force-applying component in the present invention.

[0020] In the figure: 1, base; 2, first screw rod; 201, first nut; 202, fixture platform; 2021, mounting hole; 203, first bracket; 3, upper fixture; 301, expansion block; 3011, cut slit; 302, end cover; 303, clip flap; 304, balance expansion core; 3041, through hole; 3042, conical chamfer; 305, connecting pipe; 3051, half-cut pipe; 3052, half-cut conical part ; 4. Lower fixture; 5. Cylinder; 6. Second screw rod; 601. Second nut; 7. Bending pipe test mechanism; 701. Test platform; 702. Upper guide wheel assembly; 703. Lower guide wheel assembly; 704. Left guide wheel; 705. Right guide wheel; 706. Guide groove; 707. Movable frame; 708. Adjusting screw; 8. Second bracket; 801. Cross plate; 802. Positioning plate; 803. Spring; 9. Push piece. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example: See Figure 1-5 As shown, the present invention provides a medical catheter testing device, including a base 1, a lower clamp 4 is fixedly provided on the base 1, and a first screw rod 2 and a second screw rod 6 of a column type are provided on the base 1, the first screw rod 2 and the second screw rod 6 are arranged side by side, a first nut 201 is provided on the first screw rod 2, a second nut 601 is provided on the second screw rod 6, an upper clamp 3 is provided on the first nut 201, the upper clamp 3 and the lower clamp 4 are arranged opposite to each other and have the same structure, and a bending tube testing mechanism 7 is provided on the second nut 601. It should be noted that the first screw rod 2 and the second screw rod 6 will be equipped with a sliding rod to limit the first nut 201 and the second nut 601, and a motor for controlling the rotation of the first screw rod 2 and the second screw rod 6 is provided in the base 1, because it is a conventional technology, it is not described here.

[0023] On the basis of the above embodiment, the upper clamp 3 and the lower clamp 4 include elastic expansion sleeves arranged opposite to each other and for the catheter port to be inserted, a balanced expansion core 304 inserted in the elastic expansion sleeve and used to expand the elastic expansion sleeve, and a force-applying component for driving the balanced expansion core 304 to move vertically relative to the elastic expansion sleeve. The elastic expansion sleeve includes an axially fixed and annular end cap 302 and a plurality of expansion blocks 301 uniformly arranged and connected along the inner circumference of the end cap 302, and a cutting slit 3011 is provided between two adjacent expansion blocks 301. The outer wall of each expansion block 301 forms a cylindrical surface, and the inner wall of each expansion block 301 forms an inner conical surface. Taking the above clamp 3 as an example, the inner conical surface is an inner conical surface with a small upper part and a large lower part, and the outer wall of the balanced expansion core 304 is an outer conical surface with a small upper part and a large lower part, and the outer conical surface matches the inner conical surface. The end cap 302 is evenly arranged and connected with a plurality of clips 303 on the outer circumference. The middle of the clips 303 is concave and close to the outer wall of the expansion block 301. A sleeve clamping area is formed between the clips 303 and the elastic expansion sleeve. When connecting the catheter, the catheter can be freely inserted into the sleeve clamping area and the clips 303 pre-clamp the catheter elastically. Naturally, the catheter is plugged into the outer wall of the expansion block 301. By pulling the balancing expansion core 304 upward, the balancing expansion core 304 applies a radial thrust to the expansion block 301 and expands it, thereby tightening the catheter and fixing the port. The balanced expansion core 304 is axially penetrated with a through hole 3041, and a connecting tube 305 is movably provided in the through hole 3041. The facing ends of the connecting tubes 305 in the two balanced expansion cores 304 are connected to two half-cut tubes 3051, and the facing ends of the half-cut tubes 3051 in the two balanced expansion cores 304 are connected to half-cut tapered portions 3052. The facing ends of the through holes 3041 in the two balanced expansion cores 304 are provided with conical chamfers 3042, and the half-cut tapered portions 3052 cooperate with the conical chamfers 3042. When the balancing expansion core 304 moves vertically relative to the elastic expansion sleeve and expands the elastic expansion sleeve, the two half-cut tubes 3051 extend out of the conical chamfer 3042 and are in an open state; when the balancing expansion core 304 moves vertically relative to the elastic expansion sleeve and releases the elastic expansion sleeve, the two half-cut tubes 3051 are embedded in the conical chamfer 3042 and are in a closed state, wherein the conical chamfer 3042 is used to limit the open or closed state of the half-cut tapered portion 3052, which is a prior art, and the specific details here can be directly referred to the prior art.

[0024] On the basis of the above embodiment, the first nut 201 is connected with a horizontally distributed clamp platform 202, a vertical mounting hole 2021 is provided on the clamp platform 202, and the end cover 302 is fixedly engaged in the mounting hole 2021; the force-applying component can be selected from a miniature cylinder 5, the cylinder 5 is installed on the clamp platform 202 through the first bracket 203, the output end of the cylinder 5 is connected to the balance expansion core 304, and the lifting and lowering of the balance expansion core 304 is controlled by the cylinder 5 to achieve the expansion and tightening control of the expansion block 301. The first bracket 203 is connected to a side facing the connecting tube 305 with a second bracket 8 in a U-shaped shape, a horizontal plate 801 is fixedly connected to the middle of the second bracket 8, the connecting tube 305 is arranged to penetrate the second bracket 8 and the horizontal plate 801, and a positioning plate 802 is fixedly sleeved on the connecting tube 305, the positioning plate 802 is arranged between the second bracket 8 and the horizontal plate 801, and a spring 803 is squeezed between the positioning plate 802 and the second bracket 8. The outer wall of the end of the balancing expansion core 304 away from the conical chamfer 3042 is fixedly connected with a plurality of push pieces 9 distributed in the axial direction. The push pieces 9 penetrate the end cover 302 and are slidably arranged, and the inner wall of the push pieces 9 is arranged in contact with the outer wall of the expansion block 301. Taking the above clamp 3 as an example, the initial state of the connecting tube 305 is that the positioning plate 802 is close to the horizontal plate 801. At this time, the height position of the half-cut cone 3052 is constant. When the half-cut cone 3052 is just located in the conical chamfer 3042 of the balancing expansion core 304, the expansion block 301 is just in a loose state. On this basis, when the cylinder 5 drives the balancing expansion core 304 to move upward, the balancing expansion core 304 has an expanding effect on the expansion block 301, and at the same time, the conical chamfer 3042 moves upward and exposes the half-cut cone 3052. On the contrary, on this basis, when the cylinder 5 drives the balancing expansion core 304 to move downward, the balancing expansion core 304 has no effect on the expansion block 301, the conical chamfer 3042 moves downward and drives the half-cut conical portion 3052 to move downward a certain distance for buffering. At this time, the push piece 9 can move downward at the same time and can push the end of the catheter to assist in moving out of the clamping area. At the same time, the push piece 9 can also push the expansion block 301 to avoid its elasticity weakening or failure causing a flaring state.

[0025] On the basis of the above-mentioned embodiment, the inner circle of the end cover 302 is provided with a circle of sealing ring to improve the sealing between the balancing expansion core 304 and the end cover 302. The lower end of the connecting pipe 305 located in the lower clamp 4 is the water inlet / air outlet, and the upper end of the connecting pipe 305 located in the upper clamp 3 is the water outlet / air inlet. Specifically, the lower end of the connecting pipe 305 of the lower clamp 4 is connected to a three-way pipe, and the other two ends of the three-way pipe are respectively connected to a constant pressure water pump and a first water collecting tank, and the upper end of the connecting pipe 305 of the upper clamp 3 is connected to a three-way pipe, and the other two ends of the three-way pipe are respectively connected to a second water collecting tank and a constant pressure air pump, and the three-way pipe is provided with an electrically controllable valve (such as a solenoid valve) to realize the connection and disconnection of the pipeline. The control method here is relatively mature and will not be repeated in this application. When it is necessary to pass water through the conduit, the valve on the pipeline connecting the constant pressure water pump and the second water collection tank is opened. After the water from the constant pressure water pump flows through the conduit to the second water collection tank, it means that the conduit has been passed through water. The corresponding valve is closed, and then the elbow test mechanism is started for detection. After the detection, the valve on the pipeline connecting the constant pressure air pump and the first water collection tank is opened. The constant pressure air pump can blow the water in the conduit to the first water collection tank until the water stains in the conduit are blown away, and then the corresponding valve is closed.

[0026] On the basis of the above-mentioned embodiment, the bending pipe testing mechanism 7 includes a vertically distributed testing platform 701, on which an upper guide wheel group 702 and a lower guide wheel group 703 are fixedly provided, and a left guide wheel 704 and a right guide wheel 705 are horizontally slidably provided, and the left guide wheel 704 and the right guide wheel 705 are staggered in height. Both sides of the testing platform 701 are provided with guide grooves 706 that are horizontally distributed and staggered in height, and a movable frame 707 is slidably fitted in the guide groove 706, on which the left guide wheel 704 / the right guide wheel 705 are installed, and an adjusting screw 708 is horizontally rotatably provided in the guide groove 706, and the movable frame 707 is threadedly connected to the adjusting screw 708. Before testing, the two ends of the catheter are respectively tightened and connected, and the tube body of the catheter is passed through the upper wire wheel group 702, the left wire wheel 704, the right wire wheel 705 and the lower wire wheel group 703 from top to bottom in sequence, and then the forward and reverse rotation of the second screw rod 6 is controlled to control the rise and fall of the second nut 601, so as to realize the bending test of the catheter without moving the test platform 701, and the position of the movable frame 707 is controlled by adjusting the screw rod 708 by the knob, so as to adjust the bending degree of the catheter. The bending test mechanism 7 can test the catheter along its length.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medical catheter testing device, comprising a base (1), the base (1) being provided with a lower fixture (4) and a first column-type screw rod (2), the first screw rod (2) being provided with a first nut (201), the first nut (201) being provided with an upper fixture (3), characterized in that: The upper clamp (3) and the lower clamp (4) include elastic expansion sleeves arranged opposite to each other and for the catheter port to be inserted, a balancing expansion core (304) inserted in the elastic expansion sleeve and used to expand the elastic expansion sleeve, and a force-applying component for driving the balancing expansion core (304) to move vertically relative to the elastic expansion sleeve, and the elastic expansion sleeve includes an axially fixed and annular end cap (302) and a plurality of expansion blocks (301) uniformly arranged and connected along the inner circumference of the end cap (302), and a space between two adjacent expansion blocks (301). A cutting slit (3011) is provided, the outer wall of each expansion block (301) is surrounded by a cylindrical surface, the inner wall of each expansion block (301) is surrounded by an inner conical surface, the outer wall of the balancing expansion core (304) is an outer conical surface, the outer conical surface matches the inner conical surface, a plurality of clips (303) are evenly arranged and connected in the outer circumference of the end cover (302), the middle part of the clip (303) is concave and close to the outer wall of the expansion block (301), and the clip (303) and the elastic expansion sleeve are formed between The balancing expansion core (304) is provided with a through hole (3041) along the axial direction, a connecting tube (305) is movably provided in the through hole (3041), and the connecting tubes (305) in the two balancing expansion cores (304) are connected to two half-cut tubes (3051) at the opposite ends thereof, and the half-cut tubes (3051) in the two balancing expansion cores (304) are connected to a half-cut conical portion (3052) at the opposite ends thereof, and the through holes (3041) in the two balancing expansion cores (304) are connected to the connecting tubes (305) at the opposite ends thereof. Both ends are provided with a conical chamfer (3042), and the half-cut conical portion (3052) cooperates with the conical chamfer (3042); when the balanced expansion core (304) moves vertically relative to the elastic expansion sleeve and expands the elastic expansion sleeve, the two half-cut tubes (3051) extend out of the conical chamfer (3042) and are in an open state; when the balanced expansion core (304) moves vertically relative to the elastic expansion sleeve and releases the elastic expansion sleeve, the two half-cut tubes (3051) are embedded in the conical chamfer (3042) and are in a closed state.

2. A medical catheter testing device according to claim 1, characterized in that: The first nut (201) is connected to a horizontally distributed clamp platform (202), the clamp platform (202) is provided with a mounting hole (2021), and the end cover (302) is fixed in the mounting hole (2021); the force-applying component is a cylinder (5), the cylinder (5) is mounted on the clamp platform (202) via a first bracket (203), and the output end of the cylinder (5) is connected to the balancing expansion core (304).

3. A medical catheter testing device according to claim 2, characterized in that: The base (1) is provided with a second column-type screw rod (6), the second screw rod (6) is provided with a second nut (601), the second nut (601) is provided with a pipe bending test mechanism (7), the pipe bending test mechanism (7) comprises a vertically distributed test platform (701), an upper guide wheel group (702) and a lower guide wheel group (703) are fixedly provided on the test platform (701), and a left guide wheel (704) and a right guide wheel (705) are horizontally slidably provided, and the left guide wheel (704) and the right guide wheel (705) are staggered in height.

4. A medical catheter testing device according to claim 3, characterized in that: Guide grooves (706) which are horizontally distributed and staggered in height are provided on both sides of the test platform (701); a movable frame (707) is slidably fitted in the guide groove (706); the left guide wheel (704) / right guide wheel (705) is installed on the movable frame (707); an adjusting screw (708) is horizontally rotatably provided in the guide groove (706); and the movable frame (707) is threadedly connected to the adjusting screw (708).

5. A medical catheter testing device according to claim 1, characterized in that: The lower end of the connecting pipe (305) located on the lower clamp (4) is a water inlet / air outlet, and the upper end of the connecting pipe (305) located on the upper clamp (3) is a water outlet / air inlet; the inner circle of the end cover (302) is provided with a circle of sealing ring.

6. A medical catheter testing device according to claim 2, characterized in that: A second bracket (8) in the shape of a U is connected to one side of the first bracket (203) facing the connecting tube (305); a transverse plate (801) is connected to the middle of the second bracket (8); the connecting tube (305) passes through the second bracket (8) and the transverse plate (801); a positioning plate (802) is fixedly sleeved on the connecting tube (305); the positioning plate (802) is arranged between the second bracket (8) and the transverse plate (801); and a spring (803) is squeezed between the positioning plate (802) and the second bracket (8).

7. A medical catheter testing device according to claim 1, characterized in that: The outer wall of one end of the balancing expansion core (304) away from the conical chamfer (3042) is fixedly connected with a plurality of push pieces (9) distributed along the axial direction. The push pieces (9) penetrate the end cover (302) and are slidably arranged, and the inner wall of the push pieces (9) is arranged to fit the outer wall of the expansion block (301).

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