Artery indwelling needle and connecting structure of artery indwelling needle and pressure tube

Abstract

The utility model discloses an arterial indwelling needle and a connecting structure of the arterial indwelling needle and a pressure tube, relates to the field of medical instruments, and solves the problem that arterial blood is very easy to spray out after the arterial indwelling needle is withdrawn. According to the technical scheme, the artery indwelling needle comprises a shell, a needle tube and a needle base, wing plates are arranged on the two opposite sides of the shell respectively, a sleeve, a front channel, an elastic catheter and a rear channel are coaxially arranged, an indwelling needle channel is formed in the shell, the shell is provided with a groove for exposing the elastic catheter, a clamp is arranged at the position of the groove, and the elastic catheter is sleeved with the clamp. The clip can partially block the elastic catheter and can also completely block the elastic catheter; an elastic sealing plug is fixed to the rear end of the shell and provided with a through hole coaxial with the rear channel, the rear end of the needle tube is fixed to the needle base, the needle tube penetrates through the through hole and is located in the remaining needle channel, and at least one side hole is formed in the position, located on the elastic catheter, of the needle tube. And after the needle tube and the needle seat are withdrawn, the rear end of the shell is connected with the pressure tube to form a channel.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to an arterial indwelling needle and a connection structure between the indwelling needle and a pressure tube after the needle exits the needle tube. Background Art

[0002] The primary function of an arterial catheter is to obtain arterial blood samples, as well as to perform monitoring and treatment. An arterial catheter consists of a housing, a needle, and a needle hub. The housing is equipped with wings on opposite sides, securing the housing to the body. The front end of the housing is connected to a soft cannula, and the rear end of the housing is equipped with a connector that connects to a pressure tube. The needle is typically made of steel. One end of the needle is secured to the needle hub, while the other end passes through the housing and cannula at the rear end and exits through the front end of the cannula. During puncture, the cannula is inserted into the artery along with the needle. The needle is then removed, leaving the soft cannula in place. Due to high arterial blood pressure, arterial blood can flow back through the needle when the needle is removed. Arterial pressure is typically reduced by applying pressure to the artery to prevent blood from spurting out of the rear end of the housing. If pressure is not applied promptly or accurately, blood can easily spurt out of the rear end of the housing, causing unnecessary blood loss for the patient and contaminating the operating area, posing a risk of nosocomial disease transmission.

[0003] In order to prevent arterial blood from spurting out after the needle of an arterial catheter is removed, a switch is set in the housing and used to temporarily block the channel. For example, the patent with authorization announcement number CN 221712143 U discloses an arterial catheter with a liquid-stopping function (hereinafter referred to as comparative document 1). By setting a liquid-stopping clip on the housing, the liquid-stopping clip is provided with a liquid-stopping groove for pressing the elastic catheter inward to close, and a flow hole for the elastic catheter to pass through without contacting the liquid-stopping clip, and the liquid-stopping groove is connected to the through hole. When the steel needle is pulled out, the liquid-stopping clip is operated to block the elastic catheter, so that the end maintains pressure, thereby preventing arterial blood from spurting out through the catheter. The arterial catheter involved in comparative document 1 can prevent arterial blood from spurting out of the rear end of the housing through the elastic catheter, but it still has the following shortcomings. First, when the front end (needle tip) of the needle tube and the cannula pierce the artery, arterial blood is not easy to enter the elastic catheter, and the operator cannot easily observe the blood return, and cannot directly judge whether the needle tube and the cannula have pierced the artery. Second, when the needle is inside the elastic conduit, the stopper clip cannot block the elastic conduit because the needle is made of steel and is incompressible. To prevent arterial blood from spurting out, the ideal method is to first withdraw the needle until the needle tip just passes through the stopper clip, then pause withdrawing the needle, then use the stopper clip to block the elastic conduit, and then continue withdrawing the needle until the needle is completely removed. This operation is very cumbersome and difficult for the operator to master. In practice, the needle withdrawal operation is often a one-time continuous withdrawal, so it is easy to cause arterial blood to spurt out from the rear end of the shell due to the failure to operate the stopper clip in time. Third, the stopper clip can only control the elastic conduit to be in the two states of passage and disconnection, and cannot control the elastic conduit to maintain a small opening, which can neither prevent arterial blood from spurting out nor control the arterial blood to expel the air in the elastic conduit. Fourth, the shell is only equipped with a stopper clip as the only switch to stop the liquid. Before the rear end of the shell is connected to the pressure tube, if the stopper clip fails or is misoperated, the entire elastic conduit will be unobstructed, and blood will spurt out from the connector at the rear end of the shell. Patent application publication number CN 118001503 A also discloses an arterial catheter with a fluid-stopping function (hereinafter referred to as Reference 2). The technical solution of Reference 2 is similar to that of Reference 1. One difference between the two is that Reference 2 replaces the push-operated fluid-stopping clip in Reference 1 with a press-operated clip. While this is more convenient, it still suffers from the aforementioned deficiencies. Utility Model Content

[0004] The utility model firstly provides an arterial indwelling needle, which solves the problem that arterial blood is easily ejected after the existing arterial indwelling needle is withdrawn.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: an arterial indwelling needle, including a shell, a needle tube and a needle seat, the shell is made of a light-transmitting material, wing plates are respectively provided on opposite sides of the shell, the front end of the shell is connected to the sleeve, the rear end of the shell is provided with a joint structure, the interiors of the front and rear ends of the shell are respectively provided with a front channel and a rear channel, the two channels are sealed and connected by an elastic catheter, the elastic catheter is made of a light-transmitting material, the front end of the front channel is sealed and connected to the sleeve, the sleeve, the front channel, the elastic catheter and the rear channel are coaxially arranged to form an indwelling needle channel, the shell is also provided with a groove exposing the elastic catheter, the groove is provided with a clip that adapts to each other and can squeeze the elastic catheter, the clip includes a movable spring piece and a fixed hook The movable spring piece is provided with a hook, and the fixed hook is provided with an upper and lower hanging platform. When the movable spring piece cooperates with the upper hanging platform of the fixed hook, the elastic catheter is partially blocked by the clamp; when the movable spring piece cooperates with the lower hanging platform of the fixed hook, the elastic catheter is completely blocked by the clamp; an elastic sealing plug is fixed to the rear end of the shell, and the elastic sealing plug corresponds to the rear end of the rear channel. The elastic sealing plug is provided with a through hole coaxial with the rear channel, and the diameter of the through hole is smaller than the outer diameter of the needle tube; the rear end of the needle tube is fixed to the needle seat, the needle tube passes through the through hole of the elastic sealing plug and is located in the indwelling needle channel, the front end of the needle tube passes through the front end of the sleeve, and the needle seat abuts against the rear end of the shell. The position of the needle tube at the elastic catheter is provided with at least one side hole, and the side hole is connected with the front end of the needle tube.

[0006] In order to ensure that the elastic sealing plug can be firmly fixed to the rear end of the shell, further: a countersunk hole is provided at the rear end of the shell, the shape of the countersunk hole is consistent with the shape of the elastic sealing plug, and the elastic sealing plug is bonded and fixed in the countersunk hole.

[0007] The through-hole in the elastic sealing plug has a very small diameter. Once the needle is inserted, the outer wall of the needle and the hole are automatically sealed. Once the needle is removed from the elastic sealing plug, the through-hole connects the indwelling needle channel to the outside world. The elastic sealing plug should be made of a material that will not fail during production, sterilization, storage, and use. Specifically, the elastic sealing plug should be made of silicone or latex.

[0008] The needle tube is generally made of metal to ensure strength and facilitate disinfection. Specifically, the needle tube is made of stainless steel.

[0009] The diameter of the needle is very small, making it difficult to directly grasp and withdraw the needle. Therefore, the rear end of the needle is fixed to the needle holder so that the operator can grasp the needle holder to withdraw the needle. To facilitate the grasping of the needle holder, one end of the needle holder is adapted to the shape of the rear end of the housing and connects to the needle, and the other end of the needle holder is a handle with an anti-slip structure on the outer surface of the handle.

[0010] After the needle is removed from the indwelling needle channel, blood inevitably adheres to the needle, exposing the needle tip to the outside, posing a serious risk of puncture. To prevent the blood-stained needle from being exposed, further options include: a soft sheath on the outside of the handle; or a cylindrical handle with a hard sheath on the outside, the inner wall of the sheath threadedly engaging with the outer wall of the handle.

[0011] The beneficial effects of the present invention's arterial indwelling needle are as follows: an elastic sealing plug is fixed to the rear end of the housing; after the needle tube passes through the through hole of the elastic sealing plug and enters the indwelling needle channel, the outer wall of the needle tube and the hole wall of the through hole are automatically sealed; while the clamp remains open, the cannula is inserted into the artery along with the needle tube; because a small amount of air is enclosed in the indwelling needle channel, the air in the indwelling needle channel is compressed under the action of arterial blood pressure, allowing arterial blood to enter the needle tube; when the arterial blood pressure reaches equilibrium with the air pressure in the indwelling needle channel, arterial blood stops entering the indwelling needle channel. Arterial blood entering the needle tube first flows into the elastic conduit through the side hole of the needle tube; because the elastic conduit is made of a light-transmitting material, the operator can directly observe the blood return situation through the groove of the housing in a timely manner, thereby accurately judging whether the needle tube and cannula have penetrated the artery.

[0012] After securing the housing to the human body using the wings on either side of the housing, the needle can be removed. To do so, the operator holds the housing in place with one hand while using a finger to press the movable spring element of the clamp in preparation for removal. With the other hand, the operator holds the needle holder to remove the needle. After the needle is completely removed, the movable spring element of the clamp is promptly pressed to completely block the elastic conduit. The moment the needle exits the through-hole of the elastic sealing plug, the through-hole connects the indwelling needle channel to the outside world. Due to the small diameter of the through-hole, arterial blood is insufficient to fill the indwelling needle channel between the time the through-hole regains its unobstructed state and the time the clamp completely blocks the elastic conduit. Therefore, arterial blood will not spurt out of the through-hole, allowing the operator ample time to dispose of the withdrawn needle and needle holder as required. Furthermore, since the needle is inserted into the through-hole of the elastic sealing plug, the elastic sealing plug can also reduce the amount of blood carried by the needle when the needle is removed.

[0013] After the operator has processed the needle tube and needle seat, he adjusts the clamp from the position where the movable spring piece cooperates with the lower hanging platform of the fixed hook to the position where the movable spring piece cooperates with the upper hanging platform of the fixed hook, so that the arterial blood fills the indwelling needle channel and the air in the indwelling needle channel is discharged. Then, the elastic catheter is used to completely block the indwelling needle channel through the clamp. Finally, the joint structure of the pressure tube prepared in advance is connected to the joint structure at the rear end of the shell to form a complete channel between the artery and the pressure tube.

[0014] The present application also provides a connection structure between an arterial catheter and a pressure tube, which is used to achieve an effective connection between the arterial catheter and the pressure tube. The connection structure between the arterial catheter and the pressure tube includes a pressure tube and any of the above-mentioned arterial catheters, wherein the needle tube and needle seat of the arterial catheter have been withdrawn from the catheter channel, and the rear end of the shell is tubular and has an external thread; the end of the pressure tube is connected to a connection cover, which has an internal thread that matches the external thread at the rear end of the shell, and a puncture needle is provided at the center of the inner side of the connection cover, one end of the puncture needle is connected to the pressure tube, and the other end of the puncture needle is provided with a pointed tip, and the puncture needle is provided with a side hole connected to its inner cavity near the pointed tip, and the connection cover is threadedly connected to the rear end of the shell, and the side hole is located in the catheter channel.

[0015] In order to prevent the puncture needle from being exposed outside the connection cover, furthermore, the puncture needle is completely located inside the connection cover.

[0016] The tip of the puncture needle does not need to pierce the elastic sealing plug, but only needs to be inserted into the through hole of the elastic sealing plug, squeeze the hole wall of the through hole, and enter the indwelling needle channel. Therefore, the tip of the puncture needle can be conical or blunt. In order to prevent the tip of the puncture needle from injuring the operator or other objects, the tip of the puncture needle is further blunt.

[0017] The puncture needle is generally only inserted into the rear channel of the shell. In order to make the rear channel have enough space to accommodate the puncture needle, further: a section of the rear channel of the shell corresponding to the elastic sealing plug is open, and the opening faces the elastic sealing plug, and the tip of the puncture needle is located in the rear channel of the shell.

[0018] The beneficial effect of the connection structure of the arterial indwelling needle and the pressure tube of the present invention is that a puncture needle is provided at the center of the inner side of the connecting cover, and when the connecting cover is threadedly connected to the rear end of the shell, the puncture needle can be automatically inserted into the through hole of the elastic sealing plug and squeeze the hole wall, which not only realizes the sealing between the outer wall of the puncture needle and the elastic sealing plug, but also realizes the smooth connection between the indwelling needle channel and the connecting tube, and solves the problem that the aperture of the through hole of the elastic sealing plug is very small, affecting the patency between the indwelling needle channel and the pressure tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model arterial indwelling needle.

[0020] Figure 2 It is a structural schematic diagram of an embodiment of the connection structure of the arterial indwelling needle and the pressure tube of the utility model.

[0021] Figure 3 yes Figure 2 Magnified view of area A in center.

[0022] Figure numerals: housing 1, front channel 1-1, rear channel 1-2, groove 1-3, movable spring 1-4, fixed hook 1-5, needle tube 2, needle seat 3, sleeve 4, elastic catheter 5, elastic sealing plug 6, pressure tube 7, connecting cover 8, puncture needle 9. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] The first subject of the present invention is an arterial indwelling needle. Figure 1 As shown, the arterial indwelling needle includes a shell 1, a needle tube 2 and a needle seat 3. Wings are provided on opposite sides of the shell 1, respectively, and the wing plates are used to fix the shell 1 to the human body. A front channel 1-1 and a rear channel 1-1 are provided inside the front and rear ends of the shell 1, respectively. The two channels are sealed by an elastic catheter 5. The front end of the front channel 1-1 is sealed and connected to the sleeve 4. The sleeve 4 is a hose. One section of the sleeve 4 is inserted into the front end of the front channel 1-1 and sealed. The other section of the sleeve 4 is located at the front end of the shell 1 and is suspended. The sleeve 4, the front channel 1-1, the elastic catheter 5 and the rear channel 1-1 are coaxially arranged and form an indwelling needle channel. The diameter of the front channel 1-1 is adapted to the outer diameter of the needle tube 2. The shell 1 is made of a light-transmitting material, preferably a transparent material, so that the indwelling needle channel can be observed. The elastic catheter 5 is made of a light-transmitting material, preferably a transparent material, and the elastic catheter 5 can automatically recover in time after being squeezed. The rear end of the shell 1 is provided with a joint structure, which is used to be connected to the pressure tube 7, see Figure 2 For example, the outer contour of the rear end of the housing 1 is cylindrical and is provided with an external thread.

[0025] The housing 1 is also provided with grooves 1-3 for exposing the elastic conduit 5. Figure 1 and Figure 2 In the figure, the depth direction of groove 1-3 is perpendicular to the plane corresponding to the wing plate, so Figure 1 and Figure 2 The wings are not shown. The two ends of the elastic conduit 5 are connecting sections, which are used to seal the front channel 1-1 and the rear channel 1-1 respectively. The middle part of the elastic conduit 5 is located in the groove 1-3. The groove 1-3 of the housing 1 is provided with a clamp that fits together and can squeeze the elastic conduit 5. Figure 1 and Figure 2The clamp includes a movable spring piece 1-4 and a fixed hook 1-5. The movable spring piece 1-4 is suspended in the air and fixedly mounted on the housing 1 or integrally formed with the housing 1. The movable spring piece 1-4 is provided with a hook. The fixed hook 1-5 is fixedly mounted on the housing 1 or integrally formed with the housing 1. The fixed hook 1-5 is provided with two upper and lower hanging platforms. Both the upper and lower hanging platforms can cooperate with the hook of the movable spring piece 1-4 and exert different squeezing effects on the elastic conduit 5. When the movable spring piece 1-4 cooperates with the upper hanging platform of the fixed hook 1-5, the elastic conduit 5 is partially blocked by the clamp, and the elastic conduit 5 has only a small opening. When the movable spring piece 1-4 cooperates with the lower hanging platform of the fixed hook 1-5, the elastic conduit 5 is completely blocked by the clamp.

[0026] An elastic sealing plug 6 is fixed to the rear end of the shell 1. The elastic sealing plug 6 corresponds to the rear end of the rear channel 1-1. The elastic sealing plug 6 is provided with a through hole coaxial with the rear channel 1-1, and the diameter of the through hole is smaller than the outer diameter of the needle tube 2. The elastic sealing plug 6 can be fixed to the rear end of the shell 1 by bonding or mechanical means. For example, a countersunk hole is provided at the rear end of the shell 1. The countersunk hole is generally cylindrical. The elastic sealing plug 6 has the same shape as the countersunk hole and is fixed in the countersunk hole by adhesive. The elastic sealing plug 6 is made of an elastic material, for example, the material of the elastic sealing plug 6 is silicone or latex. The through hole of the elastic sealing plug 6 is coaxial with the rear channel 1-1, that is, the through hole of the elastic sealing plug 6 is coaxial with the indwelling needle channel. The aperture of the through hole of the elastic sealing plug 6 is as small as possible. After the needle tube 2 is inserted into the through hole, the hole wall of the through hole expands, and the elastic sealing plug 6 and the outer wall of the needle tube 2 are automatically sealed. After the needle tube 2 is removed from the through hole of the elastic sealing plug 6, the through hole connects the indwelling needle channel with the outside world.

[0027] The rear end of the needle tube 2 is fixed to the needle seat 3 so that the operator can hold the needle seat 3 to withdraw the needle tube 2. The needle tube 2 passes through the through hole of the elastic sealing plug 6 and is located in the indwelling needle channel. The front end of the needle tube 2 passes through the front end of the sleeve 4, and the needle seat 3 abuts against the rear end of the shell 1. The needle tube 2 is generally made of hard metal material to ensure strength and facilitate disinfection. The material of the needle tube 2 is generally stainless steel. At least one side hole is provided at the position of the elastic catheter 5 of the needle tube 2, and the side hole is connected to the front end of the needle tube 2. The front end of the needle tube 2 is a needle tip, and the part between the needle tip and the side hole is a tubular structure. The pipe section between the side hole and the rear end of the needle tube 2 can be a tubular structure or a solid structure. In order to facilitate the operator to hold the needle seat 3 to withdraw the needle, one end of the needle seat 3 is adapted to the shape of the rear end of the shell 1 and connected to the needle tube 2, and the other end of the needle seat 3 is a handle, and the outer surface of the handle is provided with an anti-slip structure. After the needle tube 2 exits the indwelling needle channel, the outer wall of the needle tube 2 passes through the through hole of the elastic sealing plug 6, so almost no blood is visible on the outer wall of the needle tube 2. However, blood is inevitably adhered to the inner wall of the needle tube 2, and the needle tip at the front end of the needle tube 2 is exposed, posing a risk of puncture. To prevent the needle tube 2 with blood from being exposed, a soft cover is provided on the outside of the handle. By moving the soft cover forward, the soft cover can cover the needle tube 2 with blood, and the needle tube 2, needle seat 3, and soft cover can then be handled as required. For another example, the handle is cylindrical, and the outer side of the handle is provided with a sheath. The sheath is a hard cylinder, and the inner wall of the sheath is threadedly engaged with the outer wall of the handle. The sheath is rotated to move forward and cover the needle tube 2 with blood, and the needle tube 2, needle seat 3, and sheath can then be handled as required.

[0028] The second subject of the present invention is the connection structure between the arterial indwelling needle and the pressure tube, which is used to achieve an effective connection between the arterial indwelling needle and the pressure tube 7. One end of the pressure tube 7 is connected to the arterial indwelling needle, and the other end is connected to the pressure sensor. The pressure sensor is connected to the monitor through a cable. The pressure sensor or the pressure tube can also be connected to an infusion set, which can be used to infuse drugs through the artery. Figure 2 and Figure 3As shown, the connection structure between an arterial catheter and a pressure tube includes a pressure tube 7 and the arterial catheter described in the first embodiment. The needle tube 2 and needle hub 3 of the arterial catheter have been removed from the catheter passage, and the pressure tube 7 is connected to the rear end of the housing 1. The rear end of the housing 1 is tubular and has external threads for threaded connection with the connector of the pressure tube 7. A connecting cap 8 is connected to the end of the pressure tube 7, which has internal threads that mate with the external threads at the rear end of the housing 1. A puncture needle 9 is located at the center of the inner side of the connecting cap 8. One end of the puncture needle 9 is connected to the pressure tube 7, and the other end of the puncture needle 9 is provided with a pointed tip. The puncture needle 9 is used to penetrate the through-hole of the elastic sealing plug 6, effectively connecting the catheter passage with the pressure tube 7. This solves the problem of the small diameter of the through-hole of the elastic sealing plug 6, which affects the patency between the catheter passage and the pressure tube 7. The puncture needle 9 can be made of metal or plastic, but is generally made of plastic and has an outer diameter larger than that of the needle tube 2. The puncture needle 9 is provided with a side hole connected to its inner cavity near the tip. There are generally multiple side holes. When the connecting cover 8 is threadedly connected to the rear end of the housing 1, the side hole is located in the indwelling needle channel. Figure 2 and Figure 3 shown.

[0029] In order to prevent the puncture needle 9 from being exposed outside the connection cover 8, the puncture needle 9 is preferably completely located inside the connection cover 8. The tip of the puncture needle 9 does not need to pierce the elastic sealing plug 6, but only needs to be inserted into the through hole of the elastic sealing plug 6, squeeze the hole wall of the through hole and enter the indwelling needle channel. Therefore, the tip of the puncture needle 9 can be a pointed cone or a blunt shape. In order to avoid the tip of the puncture needle 9 causing puncture injuries, the tip of the puncture needle 9 is preferably blunt, such as Figure 2 and Figure 3 shown.

Claims

1. An arterial indwelling needle, comprising a housing (1), a needle tube (2) and a needle seat (3), wherein the housing (1) is made of a light-transmitting material, wing plates are respectively provided on opposite sides of the housing (1), the front end of the housing (1) is connected to a sleeve (4), and the rear end of the housing (1) is provided with a joint structure, a front channel (1-1) and a rear channel (1-2) are respectively provided inside the front and rear ends of the housing (1), and the two channels are sealed and connected by an elastic conduit (5), the elastic conduit (5) is made of a light-transmitting material, the front end of the front channel (1-1) is sealed and connected to the sleeve (4), the sleeve (4), the front channel (1-1), the elastic conduit (5) and the rear channel (1-2) are coaxially arranged and form an indwelling needle channel, the housing (1) is further provided with a groove (1-3) for exposing the elastic conduit (5), a clip that is mutually adapted and can squeeze the elastic conduit (5) is provided at the groove (1-3), the clip comprises a movable spring piece (1-4) and a fixed hook (1-5), and the movable spring piece (1-4) is provided with a hook, characterized in that: The fixed hook (1-5) is provided with two upper and lower hanging platforms. When the movable spring piece (1-4) cooperates with the upper hanging platform of the fixed hook (1-5), the elastic conduit (5) is partially blocked by the clamp; when the movable spring piece (1-4) cooperates with the lower hanging platform of the fixed hook (1-5), the elastic conduit (5) is completely blocked by the clamp; an elastic sealing plug (6) is fixed to the rear end of the housing (1), and the elastic sealing plug (6) corresponds to the rear end of the rear channel (1-2). A through hole coaxial with the rear channel (1-2) is provided, and the diameter of the through hole is smaller than the outer diameter of the needle tube (2); the rear end of the needle tube (2) is fixed to the needle seat (3), the needle tube (2) passes through the through hole of the elastic sealing plug (6) and is located in the indwelling needle channel, the front end of the needle tube (2) passes through the front end of the sleeve (4), the needle seat (3) abuts against the rear end of the housing (1), and the needle tube (2) is provided with at least one side hole at the position of the elastic conduit (5), and the side hole is communicated with the front end of the needle tube (2).

2. The arterial indwelling needle according to claim 1, wherein: The rear end of the housing (1) is provided with a countersunk hole, the shape of which is consistent with the shape of the elastic sealing plug (6), and the elastic sealing plug (6) is bonded and fixed in the countersunk hole.

3. The arterial indwelling needle according to claim 1, wherein: The elastic sealing plug (6) is made of silica gel or latex.

4. The arterial indwelling needle according to claim 1, wherein: The needle tube (2) is made of stainless steel.

5. The arterial indwelling needle according to claim 1, wherein: One end of the needle seat (3) is adapted to the shape of the rear end of the housing (1) and is connected to the needle tube (2); the other end of the needle seat (3) is a handle, and the outer surface of the handle is provided with an anti-slip structure.

6. The arterial indwelling needle according to any one of claims 1 to 5, characterized in that: The outer side of the handle is provided with a soft sleeve, or the handle is cylindrical, and the outer side of the handle is provided with a hard sleeve, and the inner wall of the sleeve is threadedly matched with the outer wall of the handle.

7. The connection structure between the arterial indwelling needle and the pressure tube is characterized by: It comprises a pressure tube (7) and an arterial indwelling needle as described in any one of claims 1 to 5 above, wherein the needle tube (2) and the needle seat (3) of the arterial indwelling needle have been withdrawn from the indwelling needle channel, and the rear end of the shell (1) is tubular and has an external thread; the end of the pressure tube (7) is connected to a connecting cover (8), and the connecting cover (8) is provided with an internal thread adapted to the external thread of the rear end of the shell (1); a puncture needle (9) is provided at the center of the inner side of the connecting cover (8), one end of the puncture needle (9) is connected to the pressure tube (7), and the other end of the puncture needle (9) is provided with a pointed tip, and the puncture needle (9) is provided with a side hole connected to its inner cavity near the pointed tip, the connecting cover (8) is threadedly connected to the rear end of the shell (1), and the side hole of the puncture needle (9) is located in the indwelling needle channel.

8. The connection structure of the arterial indwelling needle and the pressure tube according to claim 7, characterized in that: The puncture needle (9) is completely located in the connection cover (8).

9. The connection structure of the arterial indwelling needle and the pressure tube according to claim 7, characterized in that: The tip of the puncture needle (9) is blunt.

10. The connection structure of an arterial indwelling needle and a pressure tube according to claim 7, 8 or 9, characterized in that: A section of the rear channel (1-2) of the housing (1) corresponding to the elastic sealing plug (6) is open, and the opening faces the elastic sealing plug (6). The tip of the puncture needle (9) is located in the rear channel (1-2) of the housing (1).

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