Movable card connection type safe remaining needle

Abstract

The utility model relates to a safety type remaining needle, in particular to a movable card connection type safety type remaining needle which is structurally characterized in that a rectangular groove hole is formed in one side face of a front cylinder body of a connector in a needle tube puncture assembly, and a buckling groove formed in a catheter seat is located in the front groove hole; the tail end of the short elastic arm of the elastic hook is provided with a right-angle agraffe which is hooked and pressed in the buckling groove, the pressing block is installed in the rear groove hole and presses the rear end of the short elastic arm, and the long elastic arm of the elastic hook is located in the connector rear barrel and restrained by the needle tube. On one hand, the rectangular groove hole is formed in the connector and is matched with the pressing block and the elastic hook to stably connect the catheter base and the connector, and on the other hand, the elastic hook can be in linkage along with needle withdrawing by means of different states of the elastic hook before and after needle tube puncturing, and the catheter base and the connector are easily separated. Therefore, stable connection of the connector and the catheter seat is guaranteed, a stable foundation is provided for puncture operation, needle withdrawing linkage separation is achieved, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to a safety indwelling needle, in particular to a movable card connection type safety indwelling needle. Background Art

[0002] The safety indwelling needle includes a catheter assembly and a needle puncture assembly. The catheter assembly includes a fixedly connected catheter and a catheter seat. The needle puncture assembly includes a needle tube, a needle seat and a connector. One end of the needle tube is fixed on the needle seat, and the other end passes through the inner cavity of the catheter and extends forward. The connector is respectively connected to the needle seat and the catheter seat. It is detachably connected to the catheter seat, and can be fixedly connected to the needle seat, or can be movably connected, or just sleeved in the inner cavity of the needle seat. In order to prevent the needle tip from stabbing people, the connector is often used as a component to shield the needle tip. At this time, the connector and the needle seat need to be detachable. After the puncture is completed, the connector needs to be detached from the catheter seat, and the exhaust plug is replaced to connect the catheter seat.

[0003] In the prior art, the assembled safety indwelling needle needs to ensure a relatively stable connection relationship before puncture, that is, the connector and the catheter seat need to have a stable connection relationship, on the one hand to avoid overall disintegration, on the other hand to provide a stable basis for the puncture operation. Therefore, the connector and the catheter seat are mostly connected with a tight fit, such as using an outer diameter of the connector that is slightly larger than or equal to the inner cavity diameter of the catheter seat to ensure a stable connection between the connector and the catheter seat. However, this stable connection is not convenient for removing the connector from the catheter seat after the puncture is completed, especially when the catheter needs to be stably retained in the blood vessel, and there are many inconveniences in the operation of removing the connector. Summary of the invention

[0004] The utility model aims to provide a movable card connection type safety indwelling needle which can ensure stable connection and facilitate detachment of the connector according to the shortcomings of the prior art.

[0005] The purpose of the utility model is achieved through the following ways:

[0006] A movable card connection type safety indwelling needle comprises a catheter assembly and a needle tube puncture assembly, wherein the catheter assembly comprises a fixedly connected catheter and a catheter seat, and the needle tube puncture assembly comprises a needle tube, a needle seat, a limiting device and a connector, wherein the rear end of the needle tube is fixed on the needle seat, the needle tip passes through the inner cavity of the catheter and extends forward to pass through the catheter, and the limiting device is respectively connected to the needle seat and the connector; the structural key points are: a buckle groove is arranged on the outer periphery of the rear end of the catheter seat away from the catheter; and the connector, a pressing block and an elastic hook are also included;

[0007] The connector is a cylinder structure, and a partition wall is arranged at the front side of the inner cavity of the cylinder, and the partition wall divides the cylinder into a front cylinder and a rear cylinder. A plug-in boss with a needle through hole is arranged in the front end surface of the partition wall in the front cylinder, and the outer peripheral surface of the plug-in boss is adapted to the shape of the inner cavity at the rear end of the catheter seat, and the plug-in boss is loosely plugged into the inner cavity at the rear end of the catheter seat; a rectangular slot hole is opened on one side surface of the cylinder, and the front end of the rectangular slot hole is opened to the buckling groove of the catheter seat, and the rear end extends to the side surface of the rear cylinder through the partition wall, the front slot hole is located at the partition wall and the front cylinder part, and the rectangular slot hole located at the rear cylinder part is the rear slot hole, and a buckling part is arranged in the rear slot hole; when the plug-in boss is plugged into the inner cavity at the rear end of the catheter seat, the buckling groove on the catheter seat is located in the rectangular slot hole;

[0008] The size of the pressing block is adapted to the rear slot hole, and a snap device is provided on the lower end surface of the pressing block. The pressing block is snap-connected with the snap-connecting part in the rectangular slot hole through the snap-connecting device and installed in the rear slot hole, and a gap is left between the front end of the pressing block and the partition wall; the elastic hook is an L-shaped component, including a long elastic arm and a short elastic arm, the short elastic arm is placed in the rectangular slot hole of the connector, and its tail is a right-angle hook, which is pressed into the snap-connecting groove of the catheter seat, and the long elastic arm is located in the rear cylinder, and the rear end of the short elastic arm is located below the pressing block, and the length of the long elastic arm is adapted to be able to cover the needle through hole extending from the plug-in boss to the partition wall;

[0009] When the needle tube is inserted into the connector and the elastic hook, the long elastic arm of the elastic hook is stretched backward and upward, and its tail end is pressed on the needle tube body, with the gap between the front end of the pressing block and the partition wall as a fulcrum, and the short elastic arm is moved forward and downward so that the right-angle hook is pressed forward into the buckling groove of the catheter seat. After the needle is withdrawn, the long elastic arm of the elastic hook that is free from the constraint of the needle tube swings downward and forward, driving the tail end of the short elastic arm to swing upward, so that the right-angle hook loses the pressure on the buckling groove, facilitating separation.

[0010] During assembly, the elastic hook hooks the catheter seat on one side, and is constrained by the needle tube in the rear cylinder of the connector on the other side, while the pressure block presses the elastic hook, which, on the one hand, makes it stably connected between the catheter seat and the connector, realizing a stable connection between the two, so that the plug-in boss of the connector and the catheter seat only need to be loosely plugged in; on the other hand, the pressure block provides a gap between it and the partition wall as a fulcrum for the elastic hook. After the needle is withdrawn, the elastic hook loses its constraint in the rear cylinder of the connector, and it will rotate around the fulcrum as the axis, so that the elastic hook is separated from the catheter seat, and the withdrawal of the needle triggers the linkage of the elastic hook, disconnecting the connection with the catheter seat, and realizing easy and labor-saving separation of the catheter seat and the connector. Therefore, the utility model adopts a linkage combination of the connector, the pressure block and the elastic hook, and utilizes the different states of the elastic hook before and after the needle tube puncture to achieve the technical effect of stable connection before puncture and easy detachment after puncture, with a simple structure and convenient operation.

[0011] The utility model can be further specified as follows:

[0012] An extension arm is arranged on one side of the front cylinder of the connector with a rectangular slot in the direction of the catheter seat, and a front slot of the rectangular slot is opened forward to the position of the extension arm.

[0013] Due to the limited space of the catheter seat, after the connector is plugged in, the length of the front cylinder is relatively short when it covers the rear end of the catheter seat. In order to improve the connection stability, the side of the front cylinder with a rectangular slot can be extended forward so that there is enough space to enclose the buckle groove and facilitate the installation of the spring hook.

[0014] The front end of the extension arm is provided with an L-shaped push handle structure.

[0015] The L-shaped push handle structure can provide a force point for pushing the needle during puncture.

[0016] The rectangular slot is a slot with a stepped structure, and the width of the front slot is smaller than the width of the rear slot.

[0017] The stepped structure with a narrow front and wide rear makes it easy to constrain the pressing block in the rear slot hole, so that its forward and backward movement is limited. At the same time, the width of the front slot hole is adapted to the width of the short elastic arm in the elastic hook, and no left and right displacement occurs; thereby achieving a more compact and stable structure.

[0018] The tail end of the long elastic arm of the elastic hook is formed into an arc hook.

[0019] When the long elastic arm is expanded outwards under the influence of the needle tube, the tail end is pressed on the needle tube. In order to reduce the sliding resistance of the needle tube, the tail end can be bent outwards (away from the short elastic arm) into an arc hook, or it can be bent inwards.

[0020] The buckle device on the lower end surface of the pressing block is an elastic hook, which is a pair and symmetrically located on both sides of the pressing block. At this time, the buckle connection part of the rear slot hole on the connecting head is a buckle plate, which is arranged on both sides of the rear slot hole. The elastic hook hooks the buckle plate through the hook end to realize the installation of the pressing block in the rear slot hole.

[0021] The snap-fit ​​device on the lower end surface of the pressure block is a raised snap-fit ​​portion. At this time, the snap-fit ​​portion of the rear slot hole on the connector is a snap groove, which is either arranged in the longitudinal middle of the rear slot hole or on both sides of the rear slot hole. The raised snap-fit ​​portion is inserted into the snap groove to install the pressure block in the rear slot hole.

[0022] The protruding catch can be one, arranged in the middle, or two, arranged in the corresponding positions of the buckle slots on both sides of the rear slot hole. The preferred solution is two, so as to avoid interfering with the swing of the elastic hook.

[0023] In the connector, two rib plates are provided on the rear end surface of the partition wall, and the two rib plates are vertically installed on the partition wall. The space between the two rib plates serves as a stop groove for accommodating the elastic hook, and the groove width of the stop groove is adapted to the width of the elastic hook.

[0024] The anti-rotation groove is used to limit the elastic hook from turning over in the inner cavity of the rear cylinder, ensuring that after the needle is withdrawn, the elastic hook can effectively cover the needle hole and provide a safe covering effect for the needle hole.

[0025] The needle seat is connected to the rear cylinder of the connector through a limiting device, and the limiting device is either a telescopic rod arranged parallel to the needle tube; the limiting device is also a telescopic sleeve, the outer sleeve is snap-connected to the inner cavity of the rear cylinder of the connector, the inner sleeve is hooked with the outer sleeve and fixed on the needle seat, and the needle tube is inserted into the telescopic sleeve.

[0026] The limiting device is used to limit the distance between the needle seat and the connector. After the needle is withdrawn, the needle tip of the needle tube can be exactly located in the rear cylinder of the connector. The front end is restricted by the spring clip and cannot pass out, and the rear end is constrained by the limiting device and cannot detach backwards.

[0027] To sum up, the utility model provides a movable card connection type safety indwelling needle. On the one hand, a rectangular slot is set on the connecting head, and a pressure block and an elastic hook are used to stably connect the catheter seat and the connecting head. On the other hand, the elastic hook is used in different states before and after needle puncture, so that the elastic hook can be linked with the withdrawal of the needle and the catheter seat and the connecting head can be easily separated, thereby ensuring the stable connection between the connecting head and the catheter seat, providing a stable foundation for the puncture operation, and realizing the linkage separation of needle withdrawal, with a simple structure and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the appearance and structure of the movable card connection type safety indwelling needle of the utility model;

[0029] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0030] Figure 3 This is a structural schematic diagram of the active card connection type safety indwelling needle catheter assembly of the utility model;

[0031] Figure 4 It is a schematic cross-sectional structure diagram of the connector of the movable card connection type safety indwelling needle of the utility model; Figure 5 is a schematic diagram of the appearance structure of the connector;

[0032] Figure 6 This is a schematic diagram of the structure of the elastic hook in the movable card connection type safety indwelling needle of the utility model; Figure 7 It is a side line drawing of a spring card;

[0033] Figure 8 This is a structural schematic diagram of the middle pressure block of the movable card connection type safety indwelling needle of the utility model; Fig. 9 is a side view of the briquette;

[0034] Fig.10 It is a structural schematic diagram of the movable card connection type safety indwelling needle of the utility model when the needle tip just exits the elastic hook during the needle withdrawal;

[0035] Fig.11 For Fig.10 A schematic diagram of the structure when the connector is completely removed from the catheter seat based on the state structure.

[0036] The utility model is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0037] Best Mode

[0038] Refer to the attached Figure 1-3 A movable card connection type safety indwelling needle includes a catheter assembly 1 and a needle puncture assembly 2. The catheter assembly includes a fixedly connected catheter and a catheter seat; the needle puncture assembly includes a needle 2.1, a needle seat 2.2, a connector 2.3, an elastic hook 2.4, a pressure block 2.8, an operating handle 2.7 and a limit device. The needle 2.1 passes through the inner cavity of the catheter seat and extends forward through the inner cavity of the catheter, and the needle tip passes through the front tip of the catheter and exposes the end face of the catheter. The end of the catheter seat away from the catheter is a large head section, and a buckle groove 1.1 is arranged on the outer periphery of the large head section.

[0039] Refer to the attached Figure 4-5The connector 2.3 is a thin cylindrical structure, and the size of the inner cavity wall of the cylinder is comparable to the outer circumference of the large head section of the catheter seat. A partition wall 2.3.1 is arranged in the inner cavity of the cylinder at a certain distance from the front end surface. The partition wall 2.3.1 divides the cylinder into a front cylinder and a rear cylinder, that is, the inner cavity of the cylinder is divided into two front and rear cavities. In the front cylinder, a plug-in boss 2.3.2 with a needle through hole 2.3.3 is arranged on the front end surface of the partition wall 2.3.1. The outer circumferential surface of the plug-in boss 2.3.2 is adapted to the shape of the inner cavity of the large head section of the catheter seat, so that the plug-in boss 2.3.2 can be loosely plugged into the inner cavity of the large head section of the catheter seat. A rectangular slot 2.3.4 is provided on one side of the cylinder. The front end of the rectangular slot 2.3.4 is provided to the buckle groove of the catheter seat, and the rear end extends to the side of the rear cylinder through the partition wall 2.3.1. The front slot is located between the partition wall 2.3.1 and the front cylinder part, and the rectangular slot 2.3.4 located at the rear cylinder part is the rear slot. The rectangular slot is a slot with a stepped structure, and the width of the front slot is smaller than the width of the rear slot. Buckle parts 2.3.5 are provided on both sides of the rear slot; when the plug-in boss is plugged into the rear end cavity of the catheter seat, the buckle groove 1.1 on the catheter seat is located in the front slot. An extension arm with a certain width and length and the same thickness as the cylinder is extended from the end face of the front cylinder wall provided with the rectangular slot 2.3.4, and the end of the extension arm is an L-shaped push handle, or this push handle may not be provided. An annular groove 2.3.8 is provided at the rear of the inner cavity of the rear cylinder behind the partition wall 2.3.1.

[0040] Refer to the attached Figure 6-7 The elastic hook 2.4 is an L-shaped component, including a long elastic arm 2.4.3 and a short elastic arm 2.4.2. The short elastic arm 2.4.2 is installed in the rectangular slot 2.3.4 of the connector, and its tail is a right-angle hook 2.4.1. The right-angle hook 2.4.1 is pressed into the buckling groove 1.1 of the catheter seat, and the long elastic arm 2.4.3 is located in the rear cylinder. The rear end of the short elastic arm 2.4.2 is located below the pressing block 2.8. The length of the long elastic arm 2.4.3 is adapted to cover the needle through hole 2.3.3 extending from the plug-in boss to the partition wall; the tail end of the long elastic arm 2.4.3 is outwardly formed into an arc hook to reduce the sliding resistance of the needle tube.

[0041] Refer to the attached Figure 8-9The pressing block 2.8 is a rectangular block with a certain thickness, wherein the upper side surface 2.8.1 (the side exposed during installation) can be a plane or an arc surface, the arc surface curvature is equivalent to the outer periphery of the connector 2.3, the length and width of the pressing block 2.8 are equivalent to the rear slot on the connector, and a pair of elastic hooks 2.8.2 are symmetrically arranged at the rear end position on the lower side of the pressing block, and a large chamfer 2.8.2.1 is arranged on the front end side of the elastic hook (front in the direction of the conduit) to avoid mutual interference with the elastic hook 2.4 during assembly, and the distance between the elastic hooks is greater than the width of the elastic hook 2.4. A gap A is left between the front end of the pressing block 2.8 and the partition wall 2.3.1.

[0042] Combined with Figure 2 , 10 -11, the limiting device is a telescopic sleeve, including an outer sleeve 2.5 and an inner sleeve 2.6, the outer sleeve 2.5 is snap-connected to the annular groove 2.3.8 in the inner cavity of the rear cylinder of the connector, the inner sleeve 2.6 is hooked with the outer sleeve 2.5 and fixed on the needle seat 2.2, and the needle tube 2.1 is inserted into the telescopic sleeve. The operating handle 2.7 is sleeved on the outer peripheral surface of the needle seat 2.2 and fixedly connected thereto.

[0043] Refer to the attached Figure 2 In order to better understand the present invention, the following provides an assembly method of the movable card connection type safety indwelling needle tube puncture assembly of the present invention:

[0044] First, the tail end of the needle tube 2.1 faces the end of the connector plug-in boss 2.3.2 and passes through the needle hole 2.3.3, exposed at the rear end of the connector 2.3, then the tail end of the needle tube faces the needle seat 2.2 and is plugged and fixed as required. Then, the inner sleeve 2.6 and the outer sleeve 2.5 are inserted in sequence, and the outer sleeve 2.5 and the connector 2.3 are plugged and buckled firmly, then the preliminarily assembled components are inserted into the inner cavity of the operating handle 2.7, the tail end of the needle seat is inserted into the needle seat fixing hole on the operating handle 2.7, the needle tip bevel is adjusted, the needle seat 2.2 and the operating handle 2.7 are fixed, and then each component is collected into the inner cavity of the operating handle 2.7. The needle tube 2.1 is then inserted into the inner cavity of the catheter assembly from the large end of the catheter seat of the catheter assembly, through the inner cavity of the catheter, and the needle tip is exposed to the tip of the catheter. The groove 1.1 on the catheter seat is adjusted to the front slot of the rectangular slot 2.3.4 on the connector, and then the elastic hook 2.4 is aligned with the rectangular slot 2.3.4 of the connector, the short elastic arm is facing the catheter seat, and the right-angle hook 2.4.1 at the end is hooked into the buckling groove 1.1 on the catheter seat, and the elastic hook 2.4 is installed into the rear slot of the rectangular slot 2.3.4 of the connector. The end of the long elastic arm of the elastic hook is against the needle tube in the rear cylinder of the connector. Finally, the elastic hook side of the pressing block 2.8 is facing the elastic hook, against the elastic hook, and the elastic hook is pressed downward so that the elastic hook is hooked with the buckling part in the rear slot, thereby the pressing block is stuck in the rear slot, the long and short arms of the elastic hook are opened and deformed, and the right-angle hook 2.4.1 at the end of the short elastic arm is always hooked in the groove of the catheter seat, and the indwelling needle assembly is completed.

[0045] Refer to the attached Figure 10-11 The movable card connection type safety indwelling needle of the utility model is used as follows: after the indwelling needle is successfully punctured and placed, one hand holds the catheter assembly, and the other hand pinches the operating handle 2.7 to pull the needle tube away from the catheter assembly. The needle seat fixed on the operating handle moves with the movement, and the inner sleeve tube slides away from the catheter assembly through the outer convex ring of the needle seat front end and the inner convex ring of the inner sleeve, until the outer convex ring of the inner sleeve front end is buckled with the inner convex ring of the outer sleeve. At this time, the needle tube 2.1 is completely withdrawn into the cavity formed by the connector 2.3, the outer sleeve 2.5, the inner sleeve 2.6 and the needle seat 2.2. At the same time, during the needle withdrawal process, the end of the long elastic arm of the elastic hook always slides against the surface of the needle tube until the needle tip is separated from the end of the long elastic arm. The two are separated, and the elastic hook is no longer constrained by the needle tube. When the elastic force of the long elastic arm is restored, it swings downward and forward, and the short elastic arm of the same elastic hook is freely swung upward and backward. The right-angle hook at the end of the short elastic arm loses its pressing hook effect on the buckling groove on the catheter seat. Fig.10As shown. At this time, the operating handle continues to move backward, the outer sleeve drives the connector to move away from the catheter seat, and the right-angle hook at the end of the short elastic arm easily slides over the buckle groove on the catheter seat. At this point, the catheter seat on the catheter assembly is easily and completely separated from the connector, and the needle tip of the needle tube has been completely retracted into the rear barrel of the connector. The long elastic arm of the elastic hook just covers the needle hole on the connector. The needle tip moves forward and is blocked by the elastic hook, and will no longer pass through the connector to accidentally injure people, thereby achieving the purpose of preventing needle sticks.

[0046] The directions or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” in the present invention are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the technical solutions, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction.

[0047] The parts not described in the present invention are the same as those in the prior art.

Claims

1. A movable card connection type safety indwelling needle, comprising a catheter assembly and a needle puncture assembly, wherein the catheter assembly comprises a fixedly connected catheter and a catheter seat, and the needle puncture assembly comprises a needle, a needle seat, a limiting device and a connector, wherein the rear end of the needle is fixed on the needle seat, the needle tip passes through the inner cavity of the catheter and extends forward to pass through the catheter, and the limiting device is respectively connected to the needle seat and the connector; characterized in that: A buckle groove is arranged on the outer periphery of the rear end of the catheter seat away from the catheter; and the catheter seat also includes a connector, a pressure block and an elastic hook; The connector is a cylinder structure, and a partition wall is arranged at the front side of the inner cavity of the cylinder, and the partition wall divides the cylinder into a front cylinder and a rear cylinder. A plug-in boss with a needle through hole is arranged in the front end surface of the partition wall in the front cylinder, and the outer peripheral surface of the plug-in boss is adapted to the shape of the inner cavity at the rear end of the catheter seat, and the plug-in boss is loosely plugged into the inner cavity at the rear end of the catheter seat; a rectangular slot hole is opened on one side surface of the cylinder, and the front end of the rectangular slot hole is opened to the buckling groove of the catheter seat, and the rear end extends to the side surface of the rear cylinder through the partition wall, the front slot hole is located at the partition wall and the front cylinder part, and the rectangular slot hole located at the rear cylinder part is the rear slot hole, and a buckling part is arranged in the rear slot hole; when the plug-in boss is plugged into the inner cavity at the rear end of the catheter seat, the buckling groove on the catheter seat is located in the rectangular slot hole; The size of the pressing block is adapted to the rear slot hole, and a snap device is provided on the lower end surface of the pressing block. The pressing block is snap-connected with the snap-connecting part in the rectangular slot hole through the snap-connecting device and installed in the rear slot hole, and a gap is left between the front end of the pressing block and the partition wall; the elastic hook is an L-shaped component, including a long elastic arm and a short elastic arm, the short elastic arm is placed in the rectangular slot hole of the connector, and its tail is a right-angle hook, which is pressed into the snap-connecting groove of the catheter seat, and the long elastic arm is located in the rear cylinder, and the rear end of the short elastic arm is located below the pressing block, and the length of the long elastic arm is adapted to be able to cover the needle through hole extending from the plug-in boss to the partition wall; When the needle tube is inserted into the connector and the elastic hook, the long elastic arm of the elastic hook is stretched backward and upward, and its tail end is pressed on the needle tube body, with the gap between the front end of the pressing block and the partition wall as a fulcrum, and the short elastic arm is moved forward and downward so that the right-angle hook is pressed forward into the buckling groove of the catheter seat. After the needle is withdrawn, the long elastic arm of the elastic hook that is free from the constraint of the needle tube swings downward and forward, driving the tail end of the short elastic arm to swing upward, so that the right-angle hook is free from the buckling groove of the catheter seat.

2. The movable card connection type safety indwelling needle according to claim 1, characterized in that: An extension arm is arranged on one side of the front cylinder of the connector with a rectangular slot in the direction of the catheter seat, and a front slot of the rectangular slot is opened forward to the position of the extension arm.

3. The movable card connection type safety indwelling needle according to claim 2, characterized in that: The front end of the extension arm is provided with an L-shaped push handle structure.

4. The movable card connection type safety indwelling needle according to claim 1, characterized in that: The rectangular slot is a slot with a stepped structure, and the width of the front slot is smaller than the width of the rear slot.

5. The movable card connection type safety indwelling needle according to claim 1, characterized in that: The tail end of the long elastic arm of the elastic hook is formed into an arc hook.

6. The movable card connection type safety indwelling needle according to claim 1, characterized in that: The buckle device on the lower end surface of the pressing block is an elastic hook, which is a pair and symmetrically located on both sides of the pressing block. At this time, the buckle connection part of the rear slot hole on the connecting head is a buckle plate, which is arranged on both sides of the rear slot hole. The elastic hook hooks the buckle plate through the hook end to realize the installation of the pressing block in the rear slot hole.

7. The movable card connection type safety indwelling needle according to claim 1, characterized in that: The snap-fit ​​device on the lower end surface of the pressure block is a raised snap-fit ​​portion. At this time, the snap-fit ​​portion of the rear slot hole on the connector is a snap groove, which is either arranged in the longitudinal middle of the rear slot hole or on both sides of the rear slot hole. The raised snap-fit ​​portion is inserted into the snap groove to install the pressure block in the rear slot hole.

8. The movable card connection type safety indwelling needle according to claim 1, characterized in that: In the connector, two rib plates are provided on the rear end surface of the partition wall, and the two rib plates are vertically installed on the partition wall. The space between the two rib plates serves as a stop groove for accommodating the elastic hook, and the groove width of the stop groove is adapted to the width of the elastic hook.

9. The movable card connection type safety indwelling needle according to claim 1, characterized in that: The needle seat is connected to the rear cylinder of the connector through a limiting device, and the limiting device is either a telescopic rod arranged parallel to the needle tube; the limiting device is also a telescopic sleeve, the outer sleeve is snap-connected to the inner cavity of the rear cylinder of the connector, the inner sleeve is hooked with the outer sleeve and fixed on the needle seat, and the needle tube is inserted into the telescopic sleeve.

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