Remaining needle capable of preventing blood backflow

Abstract

The utility model relates to the technical field of medical accessories, in particular to an indwelling needle capable of preventing blood backflow, which comprises an indwelling needle seat, an indwelling needle tube, a puncture needle and an infusion hose, the indwelling needle tube is arranged at the front end of the indwelling needle seat, and the infusion hose is arranged on the side wall of the indwelling needle seat and used for being externally connected with an infusion container. A containing cavity is formed in the indwelling needle base, a piston is arranged in the containing cavity in a sliding mode, and when the piston moves downwards to abut against the bottom of the containing cavity, the infusion hose is separated from the indwelling needle tube; when the piston moves upwards to be separated from the bottom of the containing cavity, the infusion hose is communicated with the indwelling needle tube. According to the scheme, the arrangement of the piston facilitates control of a channel between the infusion hose and the indwelling needle tube, infusion of liquid medicine is guaranteed, backflow of blood is avoided, and the use safety of the indwelling needle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical accessories, and particularly relates to a retention needle for preventing blood reflux. Background Art

[0002] At present, after the retention needle is sealed, due to reasons such as patient movement or body position change, blood reflux in the retention needle is likely to occur. When the amount of blood reflux is large, the blood can even occupy the infusion hose of the retention needle in front of the stop clip. Since the retention needle is usually fixed by a dressing, there is inevitably a part of the infusion hose in front of the stop clip, increasing the risk of blood reflux in the retention needle; after the blood blocks the infusion hose, the retention needle needs to be replaced, causing pain and economic losses to the patient due to repeated punctures. Even if the infusion hose is not completely blocked and is forcibly squeezed, blood clots in the infusion hose may fall off and enter the patient's body, causing additional harm to the patient.

[0003] Therefore, in view of the above situation, there is an urgent need to design a retention needle for preventing blood reflux at present, which is used to prevent blood reflux and improve the reliability of the use of the retention needle. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a retention needle for preventing blood reflux to prevent blood reflux and improve the reliability of the use of the retention needle in view of the above-mentioned deficiency of easy blood reflux existing in the actual use process of the current retention needle.

[0005] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0006] A retention needle for preventing blood reflux, comprising a retention needle seat, a retention needle tube, a puncture needle and an infusion hose. The retention needle tube is arranged at the front end of the retention needle seat, the infusion hose is arranged on the side wall of the retention needle seat, and the infusion hose is used for externally connecting an infusion container. A receiving cavity is arranged in the retention needle seat, the puncture needle passes through the receiving cavity, and the front end of the puncture needle exposes from the end of the retention needle tube, and the rear end of the puncture needle exposes from the rear end of the retention needle seat. A needle holding handle is arranged at the rear end of the puncture needle, and the needle holding handle can carry the puncture needle to withdraw it from the retention needle seat.

[0007] A piston is slidably arranged in the receiving cavity. When the piston moves downward to abut against the bottom of the receiving cavity, the infusion hose is separated from the retention needle tube; when the piston moves upward to be separated from the bottom of the receiving cavity, the infusion hose is communicated with the retention needle tube.

[0008] As a preferred technical solution of the present application, a spring is arranged above the piston, one end of the spring abuts against the piston, and the other end abuts against the top of the receiving cavity.

[0009] As a preferred technical solution of the present application, a pull rod is provided on the piston. One end of the pull rod is threadedly connected to the piston, and the other end protrudes from the rear end of the indwelling needle seat. Rotating the pull rod can move the piston upward.

[0010] As a preferred technical solution of the present application, when the piston abuts against the bottom of the accommodating cavity, at least part of the thread on the pull rod is engaged with the thread on the piston.

[0011] As a preferred technical solution of the present application, the piston includes an elastic layer. The elastic layer contacts the accommodating cavity. The elastic layer has elasticity. When the puncture needle is withdrawn from the accommodating cavity, the elastic layer can close itself.

[0012] As a preferred technical solution of the present application, a backing plate is provided between the spring and the piston. The backing plate is used to balance the acting force of the spring on the piston.

[0013] As a preferred technical solution of the present application, the bottom of the accommodating cavity is conical, and the surface corresponding to the contact between the elastic layer and the bottom of the accommodating cavity is conical.

[0014] As a preferred technical solution of the present application, a protrusion is provided at the rear end of the indwelling needle seat. The protrusion is in line contact with the pull rod.

[0015] As a preferred technical solution of the present application, a plurality of grooves are provided on the part of the pull rod located outside the rear end of the indwelling needle seat. The plurality of grooves are evenly distributed on the outer periphery of the pull rod.

[0016] As a preferred technical solution of the present application, a through hole is provided at the center of the pull rod. The diameter of the through hole is larger than the diameter of the puncture needle.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. In the solution of the present application, the piston is provided to control the on-off of the infusion hose and the indwelling needle tube. Before puncture, keeping the piston in contact with the bottom of the accommodating cavity cuts off the infusion hose and the indwelling needle tube. After the puncture is completed, the puncture needle is withdrawn, avoiding blood from flowing back into the infusion hose. When infusion is needed, the piston is moved to separate the piston from the bottom of the accommodating cavity, so that the infusion hose and the indwelling needle tube are connected, and the medicinal liquid is sequentially transported to the patient's body through the infusion hose and the indwelling needle tube. After the infusion is completed, the piston is moved to make the piston abut against the bottom of the accommodating cavity, cutting off the infusion hose and the indwelling needle tube and avoiding blood reflux;

[0019] 2. The elastic force provided by the spring enables the piston to maintain contact with the bottom of the accommodating cavity, ensuring the cut-off state between the infusion hose and the indwelling needle tube and avoiding blood reflux;

[0020] 3. When infusion is required, rotate the pull rod. The threads on the pull rod engage with the threads on the piston, and the piston moves upward, separating from the bottom of the accommodation chamber, so that the infusion hose is connected to the indwelling needle tube for infusion. In this embodiment, due to the elastic force of the spring on the piston, when rotating the pull rod, the piston is prevented from rotating with the pull rod, ensuring that the threads on the piston can engage with the threads on the pull rod, enabling the piston to move upward, ensuring that the piston can separate from the bottom of the accommodation chamber, and enabling the infusion hose to be connected to the indwelling needle tube.

[0021] 4. When the piston abuts against the bottom of the accommodation chamber, at least part of the threads on the pull rod still engage with the threads on the piston. With the above structure, when the piston abuts against the bottom of the accommodation chamber, the pull rod is prevented from disengaging from the threaded connection with the piston, ensuring the repeatable movement between the pull rod and the piston, and ensuring the on-off switching between the infusion hose and the indwelling needle tube.

[0022] 5. A protrusion is provided at the rear end of the indwelling needle seat, and the contact between the protrusion and the pull rod is a line contact. With the above structure, when rotating the pull rod, the friction between the pull rod and the protrusion is reduced, which is beneficial to the rotation of the pull rod, beneficial to the engagement of the threads on the pull rod with the threads on the piston, beneficial to moving the piston upward, beneficial to moving the piston away from the bottom of the accommodation chamber, and beneficial to the connection between the infusion hose and the indwelling needle tube. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of one embodiment of an indwelling needle for preventing blood reflux according to the present application;

[0024] Figure 2 It is a cross-sectional structural diagram in a partitioned state of one embodiment of an indwelling needle for preventing blood reflux according to the present application;

[0025] Figure 3 It is a cross-sectional structural diagram in a connected state of one embodiment of an indwelling needle for preventing blood reflux according to the present application;

[0026] Figure 4 is Figure 3 an enlarged view of part A in

[0027] Reference numerals in the figures: 1 - indwelling needle seat, 2 - indwelling needle tube, 3 - puncture needle, 4 - infusion hose, 5 - piston, 6 - spring, 7 - pull rod, 8 - backing plate, 11 - accommodation chamber, 12 - protrusion, 31 - needle holding handle, 51 - elastic layer, 71 - groove, 72 - through hole. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the present utility model claimed, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0030] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present utility model is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0033] Embodiment 1: Refer to Figures 1 to 4 as shown in

[0034] A indwelling needle for preventing blood reflux provided in this embodiment includes an indwelling needle seat 1, an indwelling needle tube 2, a puncture needle 3, and an infusion hose 4. The indwelling needle tube 2 is arranged at the front end of the indwelling needle seat 1, the infusion hose 4 is arranged on the side wall of the indwelling needle seat 1, the infusion hose 4 is used for connecting to an infusion container externally, a receiving cavity 11 is arranged in the indwelling needle seat 1, the puncture needle 3 passes through the receiving cavity 11, and the front end of the puncture needle 3 exposes from the end of the indwelling needle tube 2, the rear end of the puncture needle 3 exposes from the rear end of the indwelling needle seat 1, a needle holding handle 31 is arranged at the rear end of the puncture needle 3, and the needle holding handle 31 can carry the puncture needle 3 to withdraw it from the indwelling needle seat 1;

[0035] A piston 5 is slidably arranged in the accommodation cavity 11. When the piston 5 moves downward to abut against the bottom of the accommodation cavity 11, the infusion hose 4 is separated from the indwelling needle tube 2; when the piston 5 moves upward away from the bottom of the accommodation cavity 11, the infusion hose 4 is communicated with the indwelling needle tube 2.

[0036] In this embodiment, the piston 5 is provided to control the on-off of the infusion hose 4 and the indwelling needle tube 2. Before puncture, the piston 5 abuts against the bottom of the accommodation cavity 11 to separate the infusion hose 4 from the indwelling needle tube 2. After the puncture is completed, the puncture needle 3 is withdrawn, avoiding blood from flowing back into the infusion hose 4. When infusion is needed, the piston 5 is moved so that the piston 5 is separated from the bottom of the accommodation cavity 11, enabling the infusion hose 4 to be communicated with the indwelling needle tube 2. The liquid medicine is sequentially transported to the patient's body through the infusion hose 4 and the indwelling needle tube 2. After the infusion is completed, the piston 5 is moved so that the piston 5 abuts against the bottom of the accommodation cavity 11, separating the infusion hose 4 from the indwelling needle tube 2 and avoiding blood reflux.

[0037] As a preferred embodiment, on the basis of the above method, further, a spring 6 is arranged above the piston 5. One end of the spring 6 abuts against the piston 5, and the other end abuts against the top of the accommodation cavity 11.

[0038] The elastic force provided by the spring 6 enables the piston 5 to maintain abutment with the bottom of the accommodation cavity 11, ensuring the separated state between the infusion hose 4 and the indwelling needle tube 2 and avoiding blood reflux.

[0039] As a preferred embodiment, on the basis of the above method, further, a pull rod 7 is arranged on the piston 5. One end of the pull rod 7 is threadedly connected to the piston 5, and the other end exposes from the rear end of the indwelling needle seat 1. Rotating the pull rod 7 can move the piston 5 upward.

[0040] When infusion is needed, the pull rod 7 is rotated. The thread on the pull rod 7 meshes with the thread on the piston 5, and the piston 5 moves upward. The piston 5 is separated from the bottom of the accommodation cavity 11, enabling the infusion hose 4 to be communicated with the indwelling needle tube 2 for infusion. In this embodiment, due to the elastic force of the spring 6 on the piston 5, when the pull rod 7 is rotated, the piston 5 is prevented from rotating following the rotation of the pull rod 7, ensuring that the thread on the piston 5 can mesh with the thread on the pull rod 7, enabling the piston 5 to move upward, and ensuring that the piston 5 can be separated from the bottom of the accommodation cavity 11, enabling the infusion hose 4 to be communicated with the indwelling needle tube 2.

[0041] As a preferred embodiment, on the basis of the above method, further, when the piston 5 abuts against the bottom of the accommodation cavity 11, at least part of the thread on the pull rod 7 still meshes with the thread on the piston 5.

[0042] With the above structure, when the piston 5 abuts against the bottom of the accommodation cavity 11, the disengagement of the pull rod 7 from the threaded connection with the piston 5 is avoided, ensuring the repeatable movement between the pull rod 7 and the piston 5 and the on-off switching between the infusion hose 4 and the indwelling needle tube 2.

[0043] As a preferred embodiment, on the basis of the above method, further, the piston 5 includes an elastic layer 51, the elastic layer 51 contacts the accommodation cavity 11, the elastic layer 51 has elasticity, and when the puncture needle 3 is pulled out of the accommodation cavity 11, the elastic layer 51 can seal itself.

[0044] Under the action of the spring 6, the arrangement of the elastic layer 51 makes the contact between the piston 5 and the bottom of the accommodation cavity 11 closer, further increasing the partition effect after the piston 5 abuts against the bottom of the accommodation cavity 11, which is beneficial to preventing blood backflow. At the same time, after the puncture needle 3 is pulled out of the elastic layer 51, the elastic layer 51 can seal itself, avoiding blood from flowing back into the accommodation cavity 11.

[0045] As a preferred embodiment, on the basis of the above method, further, a backing plate 8 is provided between the spring 6 and the piston 5, and the backing plate 8 is used to balance the acting force of the spring 6 on the piston 5.

[0046] The arrangement of the backing plate 8 makes the acting force of the spring 6 on the piston 5 more uniform, making the contact between the piston 5 and the bottom of the accommodation cavity 11 more uniform, which is beneficial to preventing blood backflow.

[0047] As a preferred embodiment, on the basis of the above method, further, the bottom of the accommodation cavity 11 is conical, and the surface of the elastic layer 51 in contact with the bottom of the accommodation cavity 11 is conical.

[0048] Under the action of the spring 6, the conical arrangement makes the contact between the piston 5 and the bottom of the accommodation cavity 11 closer, further increasing the partition effect after the piston 5 abuts against the bottom of the accommodation cavity 11, which is beneficial to preventing blood backflow.

[0049] As a preferred embodiment, on the basis of the above method, further, a protrusion 12 is provided at the rear end of the indwelling needle seat 1, and the protrusion 12 is in line contact with the pull rod 7.

[0050] With the above structure, when the pull rod 7 is rotated, the friction between the pull rod 7 and the protrusion 12 is reduced, which is beneficial to the rotation of the pull rod 7, the meshing of the thread on the pull rod 7 and the thread on the piston 5, the upward movement of the piston 5, the piston 5 moving away from the bottom of the accommodation cavity 11, and the connection between the infusion hose 4 and the indwelling needle tube 2.

[0051] As a preferred embodiment, on the basis of the above-described manner, further, a plurality of grooves 71 are provided on a portion of the pull rod 7 outside the rear end of the indwelling needle seat 1, and the plurality of grooves 71 are evenly distributed on the outer periphery of the pull rod 7.

[0052] The provision of the plurality of grooves 71 increases the frictional force between the hand and the pull rod 7 when the pull rod 7 is held and rotated, further facilitating the rotation of the pull rod 7, facilitating the engagement of the threads on the pull rod 7 with the threads on the piston 5, facilitating the upward movement of the piston 5, facilitating the piston 5 to move away from the bottom of the receiving cavity 11, and facilitating the connection of the infusion hose 4 and the indwelling needle tube 2.

[0053] As a preferred embodiment, on the basis of the above-described manner, further, a through hole 72 is provided at the center of the pull rod 7, and the diameter of the through hole 72 is larger than the diameter of the puncture needle 3.

[0054] With the above structure, it is only necessary to keep the relative position of the indwelling needle seat 1 unchanged when the puncture needle 3 is pulled away from the piston 5. After the puncture needle 3 is pulled away from the piston 5, the puncture needle 3 can be easily taken out from the pull rod 7, reducing the operation difficulty of the medical staff and further reducing the discomfort of the patient that may be caused during the operation.

[0055] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention are covered by the scope of the claims of the present invention.

Claims

1. An indwelling needle for preventing blood backflow, characterized in that: It comprises an indwelling needle seat, an indwelling needle tube, a puncture needle and an infusion hose, wherein the indwelling needle tube is arranged at the front end of the indwelling needle seat, the infusion hose is arranged on the side wall of the indwelling needle seat, the infusion hose is used for externally connecting an infusion container, a receiving cavity is arranged in the indwelling needle seat, the puncture needle passes through the receiving cavity, and the front end of the puncture needle is exposed from the end of the indwelling needle tube, the rear end of the puncture needle is exposed from the rear end of the indwelling needle seat, and a needle holding handle is arranged at the rear end of the puncture needle, and the needle holding handle can carry the puncture needle to make it withdraw from the indwelling needle seat; A piston is slidably provided in the accommodating chamber. When the piston moves downward and abuts against the bottom of the accommodating chamber, the infusion hose is separated from the indwelling needle tube; when the piston moves upward and separates from the bottom of the accommodating chamber, the infusion hose is connected to the indwelling needle tube.

2. The indwelling needle for preventing blood backflow as claimed in claim 1, characterized in that: A spring is arranged above the piston, one end of the spring abuts against the piston, and the other end of the spring abuts against the top of the accommodating chamber.

3. The indwelling needle for preventing blood backflow as claimed in claim 2, characterized in that: The piston is provided with a pull rod, one end of which is threadedly connected to the piston, and the other end is exposed from the rear end of the indwelling needle seat. The piston can be moved upward by rotating the pull rod.

4. The indwelling needle for preventing blood backflow as claimed in claim 3, characterized in that: When the piston abuts against the bottom of the accommodating chamber, at least a portion of the threads on the pull rod are engaged with the threads on the piston.

5. The indwelling needle for preventing blood backflow as claimed in claim 4, characterized in that: The piston comprises an elastic layer, the elastic layer is in contact with the accommodating cavity, the elastic layer is elastic, and when the puncture needle is pulled out from the accommodating cavity, the elastic layer can be sealed by itself.

6. The indwelling needle for preventing blood backflow as claimed in claim 5, characterized in that: A pad is provided between the spring and the piston, and the pad is used to balance the force of the spring on the piston.

7. The indwelling needle for preventing blood backflow as claimed in claim 6, characterized in that: The bottom of the accommodating cavity is conical, and the surface of the elastic layer contacting the bottom of the accommodating cavity is conical.

8. The indwelling needle for preventing blood backflow as claimed in claim 7, characterized in that: A protrusion is arranged at the rear end of the indwelling needle seat, and there is a line contact between the protrusion and the pull rod.

9. The indwelling needle for preventing blood backflow as claimed in claim 8, characterized in that: A portion of the pull rod outside the rear end of the indwelling needle seat is provided with a plurality of grooves, and the plurality of grooves are evenly distributed on the outer circumference of the pull rod.

10. The indwelling needle for preventing blood backflow according to claim 9, characterized in that: A through hole is arranged at the center of the pull rod, and the diameter of the through hole is larger than the diameter of the puncture needle.

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