Thrombus-preventing indwelling needle

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to an anti-thrombus indwelling needle which comprises a needle head and further comprises a flushing mechanism, the flushing mechanism comprises a shell connected to the end of the needle head, a liquid inlet and a liquid outlet are formed in the inner wall of the shell, the liquid outlet is communicated with the needle head, a rotating wheel is rotationally connected to the interior of the shell, and the rotating wheel is connected with the flushing mechanism. A baffle is slidably connected to the side, close to the liquid outlet, of the inner wall of the shell. The resetting mechanism is used for resetting the baffle plate; and a joint. Impulse type flushing can be achieved through the flushing mechanism under flowing of liquid, compared with a flushing method of pushing once and stopping once, only the injector needs to be continuously pushed, flushing convenience is improved, the position of the baffle can be adjusted through the reset mechanism, the impact strength of pulse flushing can be adjusted, applicability is improved, and the flushing efficiency is improved. The condition that the blood vessel wall and the indwelling needle inner wall are easily damaged due to overlarge pulse impact is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an anti-thrombosis indwelling needle. Background Art

[0002] The anti-thrombotic indwelling needle is a medical device used for intravenous infusion. It is mainly composed of a needle, a catheter and a connector. It can be retained in the vein for a long time, which is convenient for multiple uses and reduces the pain of repeated punctures. During infusion, the liquid medicine is injected into the vein through the connector, catheter and needle. When infusion is not needed, saline or heparin sealing solution is injected to push the residual liquid medicine in the indwelling needle into the vein.

[0003] During the use of existing anti-thrombosis catheters, blood can easily flow back from the veins into the catheter after the patient's limb movements. If the blood stays in the catheter for too long, the risk of thrombosis may increase. In clinical experience, medical staff are usually required to connect the connector through a syringe and use a push-and-stop flushing method to push the blood in the catheter back to the vein. However, excessive pulse shock can easily damage the blood vessel wall and the inner wall of the catheter, and it also requires certain operating capabilities of medical staff, and is not convenient enough. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-thrombosis indwelling needle, which can realize pulse flushing under the flow of liquid through a flushing mechanism. Compared with the flushing method of pushing and stopping, it only needs to push the syringe continuously, thereby improving the convenience of flushing. The position of the baffle can be adjusted through the reset mechanism, and the impact force of the pulse flushing can be adjusted to improve the applicability and reduce the situation where the pulse impact is too large to easily damage the blood vessel wall and the inner wall of the indwelling needle.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An anti-thrombotic indwelling needle comprises:

[0007] Needles, including:

[0008] A flushing mechanism, the flushing mechanism is arranged at the end of the needle, the flushing mechanism comprises a shell connected to the end of the needle, the inner wall of the shell is provided with a liquid inlet and a liquid outlet, the liquid outlet is communicated with the needle, a rotating wheel is rotatably connected inside the shell, a baffle is slidably connected to one side of the inner wall of the shell near the liquid outlet, and the rotating wheel and the baffle are intermittently abutted and matched;

[0009] A reset mechanism, the reset mechanism is installed at one end of the baffle away from the liquid outlet, and is used to reset the baffle;

[0010] A connector, the connector being connected to a side of the flushing mechanism away from the needle, the connector being in communication with the liquid inlet;

[0011] The rotating wheel drives the baffle to slide after rotation, thereby changing the flow cross-sectional area of ​​the liquid outlet.

[0012] As a preferred embodiment of the anti-thrombosis indwelling needle described in the present invention, the reset mechanism includes a sleeve arranged at the end of the baffle away from the liquid outlet, the sleeve is slidably connected to the shell, a spring is fixedly connected between the sleeve and the baffle, the end of the sleeve away from the baffle passes through the shell and is rotatably connected to a knob, and the knob is threadedly connected to the shell.

[0013] As a preferred solution of the anti-thrombotic indwelling needle of the present invention, the outer wall of the sleeve is provided with a flat portion, and the flat portion is slidably matched with the shell.

[0014] As a preferred solution of the anti-thrombotic indwelling needle described in the present invention, a sealing ring is arranged between the end of the sleeve away from the baffle and the shell, the sealing ring is fixedly connected to the sleeve, and the sealing ring fits with the shell.

[0015] As a preferred solution of the anti-thrombotic indwelling needle described in the present invention, a plurality of anti-slip strips are arranged on the outer side of the knob along the circumferential direction, and the anti-slip strips are fixedly connected to the knob.

[0016] As a preferred solution of the anti-thrombotic indwelling needle of the present invention, the axes of the liquid inlet and the liquid outlet are collinear, and the axes of the liquid inlet and the liquid outlet are deviated from the rotation center of the rotating wheel.

[0017] As a preferred solution of the anti-thrombotic indwelling needle of the present invention, both sides of the rotating wheel are in contact with the inner wall of the housing.

[0018] As a preferred solution of the anti-thrombotic indwelling needle described in the present invention, the rotating wheel includes a plurality of blades rotatably connected to the shell, the ends of the blades slidingly cooperate with the inner wall of the shell, and the ends of the blades abut against one end of the baffle near the liquid outlet.

[0019] As a preferred solution of the anti-thrombotic indwelling needle described in the present invention, the blade is designed to be arc-shaped, the concave side of the blade is close to the liquid inlet, and the convex side of the blade is close to the liquid outlet.

[0020] As a preferred solution of the anti-thrombotic indwelling needle described in the present invention, a slide groove is provided on one side of the shell body near the liquid outlet, the slide groove is tangent to the inner wall of the shell body, and the slide groove is slidably matched with the baffle.

[0021] The technical effects achieved by the present invention are:

[0022] The present invention adopts a flushing mechanism design, which can realize pulse flushing through the flow of liquid. The liquid flows through the housing to drive the rotating wheel to rotate, and the rotating wheel intermittently drives the baffle to move along the liquid outlet, so that the flow cross-sectional area of ​​the liquid outlet increases and decreases periodically, thereby realizing pulse flushing, avoiding the medical staff from using the flushing method of pushing and stopping through the syringe, and only needs to continuously push the syringe, thereby improving the convenience of flushing;

[0023] The present invention adopts the design of a reset mechanism, and the reset mechanism can adjust the position of the baffle so that the liquid outlet is in a pulse state, a normally closed state or a normally open state. Not only is it convenient to reset the baffle in the pulse state, but also in the normally closed state, the baffle blocks the liquid from passing through the liquid outlet, thereby reducing the situation of blood return when infusion is not needed. In the normally open state, the baffle no longer blocks the liquid from passing through the liquid outlet, thereby facilitating normal infusion. In the pulse state, the reset mechanism adjusts the minimum flow cross-sectional area of ​​the liquid outlet by adjusting the position of the baffle, thereby adjusting the impact strength of the pulse flushing, improving applicability, and reducing the situation where the pulse impact is too large to easily damage the blood vessel wall and the inner wall of the indwelling needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the flushing mechanism and the resetting mechanism in the present invention;

[0026] Figure 3 is a cross-sectional schematic diagram of the housing in the present invention;

[0027] Figure 4 The present invention Figure 3 The enlarged schematic diagram of point A in the middle;

[0028] Figure 5 It is a cross-sectional schematic diagram of the blade abutting against the baffle in the pulse state of the liquid outlet in the present invention;

[0029] Figure 6 It is a cross-sectional schematic diagram of the blade and the baffle being about to separate when the liquid outlet is in a pulse state in the present invention;

[0030] Figure 7 It is a cross-sectional schematic diagram of the liquid outlet in the normally closed state in the present invention;

[0031] Figure 8 It is a cross-sectional schematic diagram of the present invention when the liquid outlet is in a normally open state;

[0032] Fig. 9 It is a structural schematic diagram of the infusion tube and the flushing mechanism in the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 10. Needle; 11. Connector; 20. Flushing mechanism; 21. Shell; 211. Liquid inlet; 212. Liquid outlet; 213. Slide; 22. Rotating wheel; 221. Blade; 23. Baffle; 30. Reset mechanism; 31. Sleeve; 311. Flat position; 32. Spring; 33. Knob; 331. Anti-slip strip; 34. Sealing ring. DETAILED DESCRIPTION

[0035] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0036] Embodiment 1

[0037] like Figures 1 to 8 As shown, it is the first embodiment of the present invention, which provides an anti-thrombotic indwelling needle, including a needle 10, and also includes: a flushing mechanism 20, the flushing mechanism 20 is arranged at the end of the needle 10, the flushing mechanism 20 includes a shell 21 connected to the end of the needle 10, the inner wall of the shell 21 is provided with a liquid inlet 211 and a liquid outlet 212, the liquid outlet 212 is communicated with the needle 10, the shell 21 is internally rotatably connected with a rotating wheel 22, the inner wall of the shell 21 is close to the liquid outlet 212 The side is slidably connected with a baffle 23, and the rotating wheel 22 and the baffle 23 intermittently abut and cooperate; a reset mechanism 30, the reset mechanism 30 is installed at the end of the baffle 23 away from the liquid outlet 212, and is used to reset the baffle 23; a connector 11, the connector 11 is connected to the side of the flushing mechanism 20 away from the needle 10, and the connector 11 is communicated with the liquid inlet 211.

[0038] It should be noted that an infusion catheter is provided between the needle 10 and the connector 11, and the infusion catheter includes a first catheter and a second catheter. The first catheter is fixedly connected between the needle 10 and the flushing mechanism 20, and the needle 10 is communicated with the liquid outlet 212 through the first catheter. The second catheter is fixedly connected between the connector 11 and the flushing mechanism 20, and the connector 11 is communicated with the liquid inlet 211 through the second catheter. The needle 10 and the connector 11 are both prior art. The needle 10 is used to pierce the vein, and the connector 11 is used to connect external medical devices such as infusion tubes or syringes. The first catheter and the second catheter are both elastic and can be bent to a certain extent. A stop clamp is provided on the first catheter. The stop clamp is prior art and is used to clamp the first catheter.

[0039] When the present invention is in use, when pulse flushing is required, the operator injects liquid into the connector 11 through a syringe, and the liquid flows through the flushing mechanism 20 and drives the rotating wheel 22 to rotate, so that the rotating wheel 22 and the baffle 23 are intermittently abutted. When the rotating wheel 22 and the baffle 23 are abutted, the rotating wheel 22 pushes the baffle 23 to move outward. At this time, the gap between the end of the baffle 23 and the liquid outlet 212 increases, so that the flow cross-sectional area of ​​the liquid outlet 212 increases. When the rotating wheel 22 and the baffle 23 are no longer abutted and separated from each other, the reset mechanism 30 drives the baffle 23 to move inward and reset. At this time, the gap between the end of the baffle 23 and the liquid outlet 212 is reduced, so that the flow cross-sectional area of ​​the liquid outlet 212 is reduced, and the flow rate of the liquid through the liquid outlet 212 is increased, resulting in a pulse phenomenon. When the rotor 22 and the baffle 23 are abutted again, the flow cross-sectional area increases again. When the rotor 22 and the baffle 23 are separated again, the flow cross-sectional area decreases again. This reciprocating process forms a periodic pulse to flush and clean the inner wall of the indwelling needle. Compared with the traditional push-and-stop flushing method, the operator only needs to keep pushing the syringe, which improves the convenience of flushing.

[0040] Embodiment 2

[0041] Reference Figures 1 to 8 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0042] like Figure 2 , Figure 3 and Figure 4 As shown, the reset mechanism 30 includes a sleeve 31 arranged at the end of the baffle 23 away from the liquid outlet 212, the sleeve 31 is slidably connected to the shell 21, a spring 32 is fixedly connected between the sleeve 31 and the baffle 23, and the end of the sleeve 31 away from the baffle 23 passes through the shell 21 and is rotatably connected to a knob 33, which is threadedly connected to the shell 21.

[0043] It should be noted that, in the initial state, the rotating wheel 22 and the baffle 23 are not in contact, and the spring 32 is in a stationary state.

[0044] According to the above structure, after the knob 33 is rotated, the sleeve 31 is driven to slide along the shell 21, and the sleeve 31 drives the spring 32 and the baffle 23 to move inward or outward along the shell 21 to adjust the gap size between the baffle 23 and the liquid outlet 212 in the initial state. When there is a gap between the baffle 23 and the liquid outlet 212, the liquid outlet 212 is in a pulse state. At this time, the end of the baffle 23 extends into the inner side of the inner wall of the shell 21, and the rotating wheel 22 intermittently abuts against the baffle 23. When the baffle 23 completely blocks the outlet, the liquid outlet 212 is in a pulse state. When the liquid port 212 is blocked, the liquid outlet 212 is in a normally closed state. At this time, the baffle 23 prevents the liquid from moving from the side close to the needle 10 to the side close to the connector 11, reducing the blood return when no infusion is needed. When the baffle 23 does not block the liquid outlet 212, the liquid outlet 212 is in a normally open state. At this time, the end of the baffle 23 does not extend into the inner side of the inner wall of the shell 21, and the wheel 22 does not contact the baffle 23 after rotation, so that the liquid passes through the flushing mechanism 20 during normal infusion without pulse phenomenon.

[0045] Among them, when the liquid outlet 212 is in the pulse state, after the wheel 22 pushes the baffle 23 to move outward, the spring 32 is compressed. When the wheel 22 is separated from the baffle 23, the spring 32 pushes the baffle 23 to move inward under the elastic action, thereby realizing the resetting of the baffle 23. In the pulse state, by rotating the knob 33, the size of the gap between the baffle 23 and the liquid outlet 212 in the initial state is adjusted. When the gap is small, the minimum flow cross-sectional area of ​​the liquid outlet 212 is small, and the speed of the liquid flowing through the liquid outlet 212 is large, so that the impact of the pulse is large. When the gap is large, the minimum flow cross-sectional area of ​​the liquid outlet 212 is large, and the speed of the liquid flowing through the liquid outlet 212 is small, so that the impact of the pulse is small, thereby adjusting the impact force of the pulse flushing, improving applicability, and reducing the situation where the pulse impact is too large to easily damage the blood vessel wall and the inner wall of the indwelling needle.

[0046] like Figure 4 As shown, the outer wall of the sleeve 31 is provided with a flat portion 311 , and the flat portion 311 is slidably matched with the housing 21 .

[0047] It should be noted that the flattened portion 311 is a plane formed by cutting off a portion of the side surface of the cylindrical shaft, and is used to prevent the sleeve 31 from rotating.

[0048] According to the above structure, the flat part 311 cooperates with the housing 21 to prevent the sleeve 31 from rotating along the housing 21, so that the sliding process of the sleeve 31 along the housing 21 is more stable.

[0049] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a sealing ring 34 is disposed between the end of the sleeve 31 away from the baffle 23 and the housing 21 . The sealing ring 34 is fixedly connected to the sleeve 31 , and the sealing ring 34 fits closely with the housing 21 .

[0050] According to the above structure, the sealing ring 34 cooperates with the housing 21 to prevent the liquid in the housing 21 from leaking from the gap between the sleeve 31 and the housing 21, thereby improving the sealing performance.

[0051] like Figure 2 As shown, a plurality of anti-slip strips 331 are provided on the outer side of the knob 33 along the circumferential direction, and the anti-slip strips 331 are fixedly connected to the knob 33 .

[0052] According to the above structure, the anti-slip strip 331 increases the friction between the knob 33 and the operator's hand, making it easier for the operator to turn the knob 33.

[0053] like Figure 3 As shown, the axes of the liquid inlet 211 and the liquid outlet 212 are collinear, and the axes of the liquid inlet 211 and the liquid outlet 212 are both offset from the rotation center of the rotating wheel 22 .

[0054] According to the above structure, the eccentrically arranged runner 22 facilitates the liquid to drive the runner 22 to rotate when the liquid flows through.

[0055] like Figure 3 As shown, both sides of the rotating wheel 22 are in contact with the inner wall of the housing 21 .

[0056] It should be noted that the width dimension of the rotating wheel 22 along the axial direction is equal to the distance between the inner walls of the housing 21 along the axial direction.

[0057] According to the above structure, when the liquid flows from the liquid inlet 211 to the liquid outlet 212, since both sides of the impeller 22 are in contact with the inner wall of the shell 21, the liquid contacts the impeller 22 as much as possible during the flow, making it easier for the liquid to drive the impeller 22 to rotate.

[0058] like Figure 3 As shown, the impeller 22 includes a plurality of blades 221 rotatably connected to the housing 21 , the ends of the blades 221 slidingly cooperate with the inner wall of the housing 21 , and the ends of the blades 221 abut against one end of the baffle 23 close to the liquid outlet 212 .

[0059] It should be noted that the spacing between adjacent blades 221 is designed so that during the pulse process, when one blade 221 is separated from the baffle 23, the adjacent blade 221 does not move to the liquid outlet 212, so as to avoid the adjacent blade 221 hindering the baffle 23 from resetting.

[0060] According to the above structure, the plurality of blades 221 are convenient for intermittently abutting and cooperating with the baffle 23, and also facilitate the liquid to push the impeller 22 to rotate during the flow process.

[0061] like Figure 3 As shown, the blade 221 is designed to be arc-shaped, with the concave side of the blade 221 close to the liquid inlet 211 and the convex side of the blade 221 close to the liquid outlet 212 .

[0062] According to the above structure, the arc-shaped blades 221 facilitate the liquid to push the impeller 22 to rotate during the flow process.

[0063] like Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a slide groove 213 is provided on one side of the housing 21 close to the liquid outlet 212 . The slide groove 213 is tangent to the inner wall of the housing 21 , and the slide groove 213 is slidably matched with the baffle 23 .

[0064] According to the above structure, the slide groove 213 is tangent to the inner wall of the shell 21 , so that the baffle 23 can shield the liquid outlet 212 to adjust the flow cross-sectional area of ​​the liquid outlet 212 .

[0065] Embodiment 3

[0066] Reference Fig. 9 , which is the third embodiment of the present invention. This embodiment is based on the previous embodiment, and the difference lies in that the structure of the infusion catheter is changed. Specifically, medical three-way valves are provided at the connection between the two ends of the infusion catheter and the flushing mechanism 20, and the first connecting ends of the two medical three-way valves are respectively connected to the liquid inlet 211 and the liquid outlet 212, and the second connecting ends of the two medical three-way valves are respectively connected to the first catheter and the second catheter, and the third connecting ends of the two medical three-way valves are connected through an infusion tube.

[0067] According to the above structure, the flow path of the liquid is switched by two medical three-way valves. When flushing is required, the medical three-way valve is switched so that the second catheter, the flushing mechanism 20 and the first catheter are connected. At this time, the liquid does not pass through the infusion tube. When normal infusion is required, the medical three-way valve is switched so that the second catheter, the infusion tube and the first catheter are connected. At this time, the liquid does not pass through the flushing mechanism 20, so that the flushing mechanism 20 and the infusion catheter are detachable. The flushing mechanism 20 can be removed and installed on the infusion catheter of another indwelling needle, so that when the indwelling needle is replaced, the flushing mechanism 20 and the resetting mechanism 30 are avoided from being discarded together with the infusion catheter, thereby saving costs.

[0068] The working principle of the present invention is: when the liquid flows through the rotor 22, it drives the rotor 22 to rotate, and the rotor 22 drives the baffle 23 to move outward. After the rotor 22 and the baffle 23 are separated, the reset mechanism 30 drives the baffle 23 to move inward and reset, so that the gap between the baffle 23 and the liquid outlet 212 increases and then decreases, so that the flow cross-sectional area of ​​the liquid outlet 212 increases and then decreases, thereby forming a pulse to flush and clean the inner wall of the indwelling needle. Compared with the traditional push-and-stop flushing method, the operator only needs to keep pushing the syringe, which improves the convenience of flushing.

[0069] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An anti-thrombotic indwelling needle, characterized in that: include: The needle (10) further comprises: A flushing mechanism (20), the flushing mechanism (20) being arranged at the end of the needle (10), the flushing mechanism (20) comprising a shell (21) connected to the end of the needle (10), the inner wall of the shell (21) being provided with a liquid inlet (211) and a liquid outlet (212), the liquid outlet (212) being communicated with the needle (10), a rotating wheel (22) being rotatably connected inside the shell (21), a baffle (23) being slidably connected on one side of the inner wall of the shell (21) close to the liquid outlet (212), the rotating wheel (22) and the baffle (23) being intermittently abutted against each other; a reset mechanism (30), the reset mechanism (30) being mounted on an end of the baffle (23) away from the liquid outlet (212) and being used to reset the baffle (23); A connector (11), the connector (11) being connected to a side of the flushing mechanism (20) away from the needle (10), the connector (11) being in communication with the liquid inlet (211); The rotating wheel (22) rotates to drive the baffle (23) to slide, thereby changing the flow cross-sectional area of ​​the liquid outlet (212).

2. The anti-thrombotic indwelling needle according to claim 1, characterized in that: The reset mechanism (30) comprises a sleeve (31) arranged at an end of the baffle (23) away from the liquid outlet (212); the sleeve (31) is slidably connected to the housing (21); a spring (32) is fixedly connected between the sleeve (31) and the baffle (23); an end of the sleeve (31) away from the baffle (23) passes through the housing (21) and is rotatably connected to a knob (33); and the knob (33) is threadedly connected to the housing (21).

3. The anti-thrombotic indwelling needle according to claim 2, characterized in that: The outer wall of the sleeve (31) is provided with a flat portion (311), and the flat portion (311) is slidably matched with the housing (21).

4. The anti-thrombotic indwelling needle according to claim 2, characterized in that: A sealing ring (34) is provided between the end of the sleeve (31) away from the baffle (23) and the housing (21); the sealing ring (34) is fixedly connected to the sleeve (31); and the sealing ring (34) fits snugly with the housing (21).

5. The anti-thrombotic indwelling needle according to claim 2, characterized in that: A plurality of anti-slip strips (331) are arranged on the outer side of the knob (33) along the circumferential direction, and the anti-slip strips (331) are fixedly connected to the knob (33).

6. The anti-thrombotic indwelling needle according to claim 1, characterized in that: The axes of the liquid inlet (211) and the liquid outlet (212) are collinear, and the axes of the liquid inlet (211) and the liquid outlet (212) are both offset from the rotation center of the rotating wheel (22).

7. The anti-thrombotic indwelling needle according to claim 1, characterized in that: Both sides of the rotating wheel (22) are in contact with the inner wall of the housing (21).

8. The anti-thrombotic indwelling needle according to claim 1, characterized in that: The rotating wheel (22) comprises a plurality of blades (221) rotatably connected to the housing (21); the ends of the blades (221) are slidably engaged with the inner wall of the housing (21); and the ends of the blades (221) are abutted against one end of the baffle (23) close to the liquid outlet (212).

9. The anti-thrombotic indwelling needle according to claim 8, characterized in that: The blade (221) is designed to be arc-shaped, with a concave side of the blade (221) close to the liquid inlet (211), and a convex side of the blade (221) close to the liquid outlet (212).

10. The anti-thrombotic indwelling needle according to claim 1, characterized in that: A slide groove (213) is provided on one side of the shell (21) near the liquid outlet (212). The slide groove (213) is tangent to the inner wall of the shell (21), and the slide groove (213) is slidably matched with the baffle (23).

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