A squeeze-type arterial puncture needle

Abstract

This utility model discloses a squeeze-type arterial puncture needle, including a grip and a steel needle. The grip forms a blood collection chamber, and a cannula sheath is provided at the front end of the grip, while a needle guide channel is provided at the rear end. A flow-blocking component with a force-bearing part and an elastic flow-blocking part is provided in the needle guide channel. The force-bearing part extends beyond the rear end of the grip and is provided with an elastic driving component. Wedge-shaped surfaces that can fit together are respectively provided on the outer side of the elastic flow-blocking part and at the port of the needle guide channel connecting to the blood collection chamber. When the steel needle is withdrawn, the elastic driving component drives the force-bearing part to move axially within the needle guide channel, causing the elastic flow-blocking part to move towards the rear end of the grip on the wedge-shaped surface, and causing the elastic flow-blocking part to contract and close accordingly during the movement. This utility model can intercept blood in the blood collection chamber immediately upon needle withdrawal, preventing blood from gushing out and causing medical contamination, and facilitating operation by medical personnel.

Description

Technical Field

[0001] This utility model relates to the technical field of arterial puncture needles, and in particular to a squeeze-type arterial puncture needle. Background Technology

[0002] Arterial puncture is widely used in the medical field. It allows for the collection of arterial blood samples, enabling dynamic blood gas analysis, electrolyte and arterial blood pressure monitoring in critically ill patients. Patients in severe shock requiring emergency treatment, whose condition does not improve after rapid intravenous blood transfusion, need to undergo arterial puncture to increase coronary perfusion and effective blood volume. During anesthesia or surgery, as well as in critically ill patients, arterial puncture is used to continuously monitor arterial blood pressure. The arterial puncture needle is one of the essential instruments in arterial puncture.

[0003] Arterial puncture includes a gripper and a needle. The gripper is connected to a cannula at its front end and has a needle insertion port at its rear end. The needle is inserted into the gripper through this port, passes through the cannula, and extends from the interventional end of the cannula. During use, the needle is inserted into the artery to dilate it. Then, the interventional end of the cannula is inserted into the artery, and finally, the needle is withdrawn. Blood from the artery flows into the gripper along the cannula. Because blood can quickly fill the gripper after the needle is withdrawn and gush out from the insertion port, causing medical contamination, one hand must hold the artery to prevent blood from gushing out before withdrawing the needle, while the other hand withdraws the needle, which poses a challenge for medical personnel. Utility Model Content

[0004] The purpose of this invention is to provide a squeeze-type arterial puncture needle that can trap blood within the grip when the needle is withdrawn, preventing blood from gushing out and causing medical contamination, thus facilitating operation by medical personnel.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A squeeze-type arterial puncture needle includes a grip base and a steel needle; the grip base forms a blood collection chamber inside, the grip base is provided with a cannula sheath at the front end, and the grip base is provided with a guide needle channel at the rear end;

[0007] The guide needle channel is provided with a flow-blocking component having a force-receiving part and an elastic flow-blocking part. The force-receiving part extends out of the rear end of the grip and is provided with an elastic driving component. The outer side of the elastic flow-blocking part and the port of the guide needle channel connecting to the blood collection chamber are respectively provided with wedge-shaped surfaces that can fit together with each other.

[0008] The steel needle enters the guide needle channel, inserts the throttling device, passes through the blood collection chamber, and is inserted into the cannula sheath. The needle then extends from the interventional end of the cannula sheath to puncture the artery.

[0009] When the steel needle is pulled out, the elastic drive unit drives the force-receiving part to move axially within the guide needle channel, causing the elastic intercepting part to move towards the rear end of the gripping seat on the wedge-shaped surface, and causing the elastic intercepting part to contract and close accordingly during the movement.

[0010] Based on the above technical solution, the present invention can be improved as follows:

[0011] Furthermore, the flow-blocking component has a needle-clamping channel inside, through which the steel needle can pass. The needle-clamping channel includes a first channel section and a second channel section. The first channel section is located in the force-bearing part of the flow-blocking component, and the second channel section is located in the elastic flow-blocking part. The steel needle passes through the first channel section and the second channel section in sequence.

[0012] The second channel section can contract accordingly with the contraction of the elastic interceptor to clamp and fix the steel needle inserted in the second channel section, and close together after the steel needle is pulled out.

[0013] Furthermore, the grip includes a seat body and a seat cover that are detachably connected to each other, and the blood collection chamber is located at the front end of the seat body; the rear end of the guide needle channel passes through the rear end of the grip and forms a first guide needle port, and the front end of the guide needle channel communicates with the blood collection chamber and forms a second guide needle port; one end of the cannula sheath is fixedly connected to the middle of the outer side of the seat cover, and the seat cover has a corresponding through hole communicating with the cannula sheath.

[0014] Furthermore, the flow-cutting component includes a guide tube, the inner cavity of which is the first channel segment of the needle clamping channel; one end of the guide tube extends from the first guide needle port to the rear end of the seat body as the force-bearing part, and a baffle is detachably connected to the force-bearing part, and an elastic driving component is disposed between the baffle and the rear end of the seat body; the other end of the guide tube is provided with a conical claw, which serves as the elastic flow-cutting part, and at least two contraction grooves are provided on the conical claw, which are arranged at equal intervals along the circumference of the guide tube, and the outer surface of the conical claw is a wedge-shaped surface; the guide needle channel is composed of a cylindrical cavity that corresponds to and cooperates with the guide needle tube, and a conical cavity that corresponds to and cooperates with the conical claw, and the inner wall surface of the conical cavity is a wedge-shaped surface.

[0015] Furthermore, the baffle has a connecting hole on its inner plate surface, and the connecting hole has an internal thread; the extension end face of the guide needle tube has a connecting part with an external thread, and the connecting part is threadedly connected to the connecting hole on the baffle through the connecting part on the guide needle tube, so that the baffle and the guide needle tube are connected to each other; both the connecting parts on the baffle and the guide needle tube have through holes for inserting a steel needle into the guide needle tube.

[0016] Furthermore, the elastic driving spring is sleeved on the extension end of the guide needle tube, with one end of the spring abutting against the inner plate surface of the baffle and the other end of the spring abutting against the rear end face of the seat.

[0017] When the baffle is squeezed, the spring is compressed to generate elastic force; when the baffle is released, the baffle returns to its original position under the action of the spring's elastic force.

[0018] Furthermore, an annular flange is provided on the inner plate surface of the baffle and the rear end face of the seat, and the end of the spring is limited within the annular flange; the extension end of the guide needle tube is also sleeved with an elastic sleeve, one end of the elastic sleeve abuts against the inner plate surface of the baffle, the other end of the elastic sleeve abuts against the rear end face of the seat, and the end of the elastic sleeve is limited outside the annular flange.

[0019] Furthermore, the seat body has an annular lug on the outer side near the rear end.

[0020] Furthermore, the seat body has a sealing ring groove at the seat opening, and a sealing ring is placed inside the sealing ring groove. The sealing ring is used to seal the gap between the seat cover and the seat body.

[0021] Furthermore, the steel needle has an internal cavity for blood circulation; the steel needle has a sharp needle tip at its front end and a transparent blood reservoir at its rear end that communicates with the blood reservoir; the transparent blood reservoir has ventilation holes on its wall.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention incorporates a flow-blocking component within the needle guide channel. The force-bearing portion of the flow-blocking component extends beyond the rear end of the grip and is equipped with an elastic driving component. Wedge-shaped surfaces that can fit together are respectively provided on the outer side of the elastic flow-blocking portion and at the port connecting the needle guide channel to the blood collection chamber. When the needle is withdrawn, the elastic driving component externally drives the force-bearing portion of the flow-blocking component to move axially within the needle guide channel, causing the elastic flow-blocking portion to move towards the rear end of the grip on the wedge-shaped surface. During this movement, the elastic flow-blocking portion contracts and closes accordingly. Therefore, when the needle is withdrawn, blood is diverted into the blood collection chamber, preventing blood from overflowing and causing medical contamination, and facilitating operation by medical personnel. Attached Figure Description

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the squeeze-type arterial puncture needle in the embodiment;

[0026] Figure 2 This is a disassembly and assembly diagram of the squeeze-type arterial puncture needle in the embodiment;

[0027] Figure 3 This is a cross-sectional view of the squeeze-type arterial puncture needle in the embodiment;

[0028] Figure 4 for Figure 3Enlarged view of section A in the image;

[0029] Figure 5 for Figure 3 Enlarged view of section B in the image;

[0030] Figure 6 This is a diagram of the front end structure of the seat in the embodiment;

[0031] Figure 7 This is a diagram of the rear structure of the base in the embodiment;

[0032] Figure 8 This is a diagram of the front end structure of the flow-blocking component in the embodiment;

[0033] Figure 9 This is a diagram of the rear end structure of the interceptor in the embodiment;

[0034] Figure 10 This is a structural diagram of the baffle in the embodiment.

[0035] The markings on the attached diagram are: 1-Grip base, 101-Base body, 101a-Sealing ring groove, 101b-Annular lug, 102-Base cover, 102a-Annular cover edge, 2-Steel needle, 3-Sheath, 4-Bypass tube, 5-Quick connector, 6-Sealing ring, 7-Guide tube, 701-Connecting part, 8-Baffle, 801-Connecting hole, 9-Conical gripper, 901-Contraction groove, 10-Spring, 11-Annular flange, 12-Elastic sleeve, 13-Transparent blood storage sac, 14-Ventilation hole. Detailed Implementation

[0036] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These descriptions are intended to aid in understanding the utility model but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] See Figures 1 to 10 This embodiment relates to a squeeze-type arterial puncture needle, including a gripping seat 1 and a steel needle 2. The gripping seat 1 forms a blood collection chamber inside. The gripping seat 1 has a cannula sheath 3 at its front end that communicates with the blood collection chamber, and a guide needle channel at its rear end that communicates with the blood collection chamber. A flow-blocking device is provided in the guide needle channel. The steel needle 2 is inserted into the guide needle channel from the rear end of the gripping seat 1, passes through the flow-blocking device, enters the blood collection chamber, is inserted into the cannula sheath 3 from the front end of the gripping seat 1, and extends out at the intervention end of the cannula sheath 3 to puncture the artery.

[0038] The gripping seat 1 has a bypass tube 4 on its outer peripheral side, which connects to the blood collection chamber. The end of the bypass tube 4 is equipped with a quick-connect connector 5, which connects the bypass tube 4 to an external arterial pressure measuring device (not shown in the figure) through the quick-connect connector 5. When the needle tip of the steel needle 2 is inserted into the artery, the intervention end of the cannula sheath 3 is inserted into the artery and the steel needle 2 is withdrawn. The guide needle channel is closed by the choke. At this time, the blood flowing out of the artery flows into the blood collection chamber along the cannula sheath 3 and flows into the bypass tube 4. The patient's condition is detected by the connected arterial pressure measuring device.

[0039] The guide needle channel has a first guide needle port and a second guide needle port. The first guide needle port is formed on the rear end face of the grip 1, and the second guide needle port is formed on the cavity wall of the blood collection chamber. The intercepting member has a force-receiving part and an elastic intercepting part. The force-receiving part extends out of the rear end of the grip 1 through the first guide needle port so that it can be driven outside the grip 1. When the force-receiving part moves axially in the guide needle channel, it causes the elastic intercepting part to elastically contract and close the second guide needle port, thereby intercepting the blood flowing through the guide needle channel into the blood collection chamber.

[0040] The outer side of the elastic intercepting part and the second guide needle port are respectively provided with wedge-shaped surfaces that can fit together when the second guide needle port is closed. The elastic intercepting part can move relative to the second guide needle port on the wedge-shaped surface toward the rear end of the gripping seat 1, and shrink and close accordingly during the movement to complete the closure.

[0041] The grip 1 is provided with an elastic drive member at the first port. The elastic drive member generates elastic force by itself and applies it to the force-bearing part of the flow-blocking member outside the grip 1, so that the elastic flow-blocking part of the flow-blocking member has a tendency to contract and close.

[0042] The flow-blocking component has a needle-clamping channel inside, through which the steel needle 2 can be inserted. The needle-clamping channel includes a first channel section and a second channel section. The first channel section is located in the force-bearing part of the flow-blocking component, and the second channel section is located in the elastic flow-blocking part. The steel needle 2 is inserted through the first channel section and the second channel section in sequence. The second channel section can contract accordingly with the contraction of the elastic flow-blocking part to clamp and fix the steel needle 2 inserted in the second channel section, and closes and closes after the steel needle 2 is withdrawn. When the steel needle 2 is inserted into the flow-blocking component, the force-bearing end of the flow-blocking component can be squeezed to make the elastic flow-blocking part move relative to the second guide needle port on the wedge surface towards the front end of the gripping seat 1, and expand in all directions during the movement to increase the diameter of the second channel section, so as to facilitate the rapid insertion of the steel needle 2. When the needle tip of the steel needle 2 extends out of the insertion end of the sheath 3, the squeezing of the force-bearing end of the flow-blocking component stops, and the force-bearing end of the flow-blocking component is reset under the elastic force of the elastic drive component. The elastic flow-blocking part resumes contraction to clamp and fix the steel needle 2 inserted in the second channel section.

[0043] Specifically, the grip 1 is a hollow cylindrical structure, including a seat body 101 and a seat cover 102 that are detachably connected to each other. The front end of the seat body 101 forms a seat opening through which the flow-stopping component can be installed inside the seat body 101. The seat cover 102 covers the front end of the seat body 101 at the seat opening. The seat body 101 forms a blood collection chamber and a guide needle channel inside. The blood collection chamber is a circular cavity located at the front end of the seat body 101 and connected to the seat opening. The guide needle channel is a cavity corresponding to the shape of the flow-stopping component. The rear end of the guide needle channel passes through the rear end of the grip 1 and forms a first guide needle port. The front end of the guide needle channel connects to the blood collection chamber and forms a second guide needle port.

[0044] The seat cover 102 has a circular cover structure. The seat cover 102 has an annular cover edge 102a at its edge. The inner side of the annular cover edge 102a is provided with an internal thread. The seat body 101 has an external thread on the outer side of its seat opening. The annular cover edge 102a of the seat cover 102 is threadedly connected to the seat opening of the seat body 101 so that the seat cover 102 closes the seat opening of the seat body 101. The seat body 101 also has a sealing ring groove 101a on the outer side of its seat opening. The sealing ring groove 101a contains a sealing ring 6. The sealing ring 6 is used to close the gap between the seat cover 102 and the seat body 101 to improve confidentiality and prevent leakage of blood concentrated in the blood collection chamber, which could cause medical contamination.

[0045] The sheath 3 is a long hollow tube. One end of the sheath 3 is fixedly connected to the middle of the outer side of the cover 102. The cover 102 has a through hole that connects to the sheath 3. The other end of the sheath 3 is the intervention end, and an arc-shaped guide angle is formed at the intervention end to facilitate smooth insertion into the artery and reduce patient discomfort.

[0046] The flow-cutting component includes a guide needle tube 7, the inner cavity of which is the first channel section of the needle clamping channel; one end of the guide needle tube 7 extends from the first guide needle port to the rear end of the seat 101 as a force-bearing part, and a baffle 8 is detachably connected to the force-bearing part. An elastic drive component is disposed between the baffle 8 and the rear end of the seat 101; the other end of the guide needle tube 7 is provided with a conical claw 9, which serves as an elastic flow-cutting part. The diameter of the conical claw 9 gradually increases along the direction away from the force-bearing part of the guide needle tube 7. At least two contraction grooves 901 are provided on the conical claw 9 to form an active space for the conical claw 9 to contract. The contraction grooves 901 are arranged at equal intervals along the circumference of the guide needle tube 7, and the outer surface of the conical claw 9 is a wedge-shaped surface; correspondingly, in this embodiment, the guide needle channel is composed of a cylindrical cavity that corresponds to and cooperates with the guide needle tube 7, and a conical cavity that corresponds to and cooperates with the conical claw 9. The inner wall surface of the conical cavity is a wedge-shaped surface.

[0047] Under the elastic force of the elastic drive component, the movement of the baffle 8 away from the rear end of the seat 101 causes the guide needle tube 7 to move axially. The outer surface of the conical gripper 9 is in contact with the inner wall of the conical cavity, forming a force perpendicular to the axial movement path on the conical gripper 9, so that the conical gripper 9 has a tendency to retract and close.

[0048] When the guide tube 7 is inserted into the steel needle 2, the compression baffle 8 drives the guide tube 7 to move towards the front end of the seat 101 within the cylindrical cavity, causing the conical gripper 9 to move towards the front end of the seat 101 within the conical cavity. During this movement, the conical gripper 9 expands outwards, forming a second channel section in the middle of the needle clamping channel to facilitate rapid insertion of the steel needle 2. When the tip of the steel needle 2 extends beyond the insertion end of the sheath 3, the compression baffle 8 stops, and the baffle 8 is then subjected to the elastic force of the elastic drive member. When the needle is lowered and reset, the conical jaws 9 contract and clamp the steel needle 2, thereby preventing the steel needle 2 from moving and prematurely withdrawing from the artery before the interventional end of the cannula sheath 3 is inserted to the predetermined length. By keeping the steel needle 2 and the gripper 1 relatively fixed, the steel needle 2 can keep the artery open so that the cannula sheath 3 can be inserted smoothly. After the cannula sheath 3 is inserted into the artery to the predetermined length, the steel needle 2 is withdrawn, and the conical jaws 9 contract and close to complete the closure of the second channel section of the needle clamping channel, so as to intercept the blood in the blood collection chamber.

[0049] The baffle 8 is a circular plate. A connecting hole 801 is provided on the inner plate surface of the baffle 8, and an internal thread is provided in the connecting hole 801. A connecting part 701 is provided on the extended end face of the guide needle tube 7, and an external thread is provided on the connecting part 701. The connecting part 701 on the guide needle tube 7 and the connecting hole 801 on the baffle 8 are threadedly connected to each other so that the baffle 8 and the guide needle tube 7 can be connected to each other. Both the connecting part 701 on the baffle 8 and the guide needle tube 7 are provided with through holes so that the steel needle 2 can be inserted into the guide needle tube 7.

[0050] The elastic drive component is a spring 10, which is sleeved on the extension end of the guide needle tube 7. One end of the spring 10 abuts against the inner plate surface of the baffle 8, and the other end of the spring 10 abuts against the rear end face of the seat 101. When the baffle 8 is squeezed, the spring 10 is compressed to form an elastic force. When the baffle 8 is released, the baffle 8 returns to its original position under the action of the elastic force of the spring 10.

[0051] An annular flange 11 is provided on the inner plate surface of the baffle 8 and the rear end face of the seat 101. The end of the spring 10 is limited within the annular flange 11. An elastic sleeve 12 is also sleeved on the extension end of the guide tube 7. The elastic sleeve 12 is made of medical silicone. One end of the elastic sleeve 12 abuts against the inner plate surface of the baffle 8, and the other end of the elastic sleeve 12 abuts against the rear end face of the seat 101. The end of the elastic sleeve 12 is limited outside the annular flange 11. The elastic sleeve 12 has a wavy cross-section so that the elastic sleeve 12 can expand and contract accordingly according to the movement of the baffle 8. By setting the elastic sleeve 12, it is possible to prevent airborne objects from adhering to the guide tube 7, avoiding the guide tube 7 from bringing airborne objects into the seat 101 to contaminate the blood when it moves, thus improving cleanliness.

[0052] The seat 101 has an annular lug 101b on the outer side near the rear end. The annular lug 101b can serve as a force point so that the baffle 8 can be squeezed or loosened when the seat 101 is held with one hand.

[0053] The bypass tube 4 is inclinedly connected to the outer side of the seat 101 near the front end and connects to the blood collection chamber. The axis of the bypass tube 4 forms an angle with the axis of the seat 101, with the angle ranging from 20° to 45°.

[0054] The steel needle 2 is a slender needle body, and a needle cavity is formed inside the steel needle 2 to allow blood to flow; the steel needle 2 has a sharp needle tip at the front end, and a transparent blood storage sac 13 connected to the needle cavity at the rear end, with a vent hole 14 on the wall of the transparent blood storage sac 13.

[0055] In practice, hold the grip base 1 and align the needle tip of the steel needle 2 with the puncture site on the body. The steel tip pierces the subcutaneous tissue and enters the artery. Blood flows from the needle tip into the steel needle 2 and along the needle cavity, flowing from the rear end of the steel needle 2 into the transparent blood reservoir 13 for temporary storage to prevent blood from spurting out and causing medical contamination. At the same time, the puncture status of the steel needle 2 can be judged by observing the outflow of blood in the transparent blood reservoir 13; when the blood gushes out in a pulsating manner, it means that the needle tip of the steel needle 2 has been inserted into the artery. At this point, the vent 14 on the transparent blood storage sac 13 is blocked with a finger to form a closed space inside the transparent blood storage sac 13, stopping the blood from continuing to flow out; then the cannula sheath 3 is inserted into the artery, and then the steel needle 2 is slowly withdrawn; when the needle tip of the steel needle 2 is withdrawn from the second channel section of the needle clamping channel, the conical clamp 9 contracts and closes to seal the second channel section, and the blood flows into the cannula sheath 3, is intercepted in the blood collection chamber, and flows into the bypass tube 4, and the patient's condition is detected by the connected arterial pressure measuring device.

[0056] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A squeeze-type arterial puncture needle, comprising a grip base and a steel needle; the grip base forms a blood collection chamber, a cannula sheath is provided at the front end of the grip base, and a needle guide channel is provided at the rear end of the grip base; characterized in that, The guide needle channel is provided with a flow-blocking component having a force-receiving part and an elastic flow-blocking part. The force-receiving part extends out of the rear end of the grip and is provided with an elastic driving component. The outer side of the elastic flow-blocking part and the port of the guide needle channel connecting to the blood collection chamber are respectively provided with wedge-shaped surfaces that can fit together with each other. The steel needle enters the guide needle channel, inserts the throttling device, passes through the blood collection chamber, and is inserted into the cannula sheath. The needle then extends from the interventional end of the cannula sheath to puncture the artery. When the steel needle is pulled out, the elastic drive unit drives the force-receiving part to move axially within the guide needle channel, causing the elastic intercepting part to move towards the rear end of the gripping seat on the wedge-shaped surface, and causing the elastic intercepting part to contract and close accordingly during the movement.

2. The squeeze-type arterial puncture needle according to claim 1, characterized in that, The flow-blocking component has a needle-clamping channel inside, through which the steel needle can pass. The needle-clamping channel includes a first channel section and a second channel section. The first channel section is located in the force-bearing part of the flow-blocking component, and the second channel section is located in the elastic flow-blocking part. The steel needle passes through the first channel section and the second channel section in sequence. The second channel section can contract accordingly with the contraction of the elastic interceptor to clamp and fix the steel needle inserted in the second channel section, and close together after the steel needle is pulled out.

3. The squeeze-type arterial puncture needle according to claim 2, characterized in that, The grip includes a seat body and a seat cover that are detachably connected to each other. The blood collection chamber is located at the front end of the seat body. The rear end of the guide needle channel passes through the rear end of the grip and forms a first guide needle port. The front end of the guide needle channel connects to the blood collection chamber and forms a second guide needle port. One end of the cannula sheath is fixedly connected to the middle of the outer side of the seat cover. The seat cover has a corresponding through hole that connects to the cannula sheath.

4. The squeeze-type arterial puncture needle according to claim 3, characterized in that, The flow-cutting component includes a guide tube, the inner cavity of which is the first channel section of the needle clamping channel; one end of the guide tube extends from the first guide needle port to the rear end of the seat body as the force-bearing part, and a baffle is detachably connected to the force-bearing part, and an elastic driving component is disposed between the baffle and the rear end of the seat body; the other end of the guide tube is provided with a conical claw, which serves as the elastic flow-cutting part, and at least two contraction grooves are provided on the conical claw, which are arranged at equal intervals along the circumference of the guide tube, and the outer surface of the conical claw is a wedge-shaped surface; the guide needle channel is composed of a cylindrical cavity that corresponds to and cooperates with the guide tube, and a conical cavity that corresponds to and cooperates with the conical claw, and the inner wall surface of the conical cavity is a wedge-shaped surface.

5. The squeeze-type arterial puncture needle according to claim 4, characterized in that, The baffle has a connecting hole on its inner plate surface, and the connecting hole has an internal thread. The extension end of the guide needle tube has a connecting part with an external thread. The connecting part on the guide needle tube and the connecting hole on the baffle are threaded together to connect the baffle and the guide needle tube. Both the connecting parts on the baffle and the guide needle tube have through holes for inserting a steel needle into the guide needle tube.

6. The squeeze-type arterial puncture needle according to claim 5, characterized in that, The elastic driving spring is sleeved on the extension end of the guide needle tube, with one end of the spring abutting against the inner plate surface of the baffle and the other end of the spring abutting against the rear end face of the seat. When the baffle is squeezed, the spring is compressed to generate elastic force; when the baffle is released, the baffle returns to its original position under the action of the spring's elastic force.

7. The squeeze-type arterial puncture needle according to claim 6, characterized in that, An annular flange is provided on the inner plate surface of the baffle and the rear end face of the seat, and the end of the spring is limited within the annular flange; the extension end of the guide needle tube is also sleeved with an elastic sleeve, one end of the elastic sleeve abuts against the inner plate surface of the baffle, the other end of the elastic sleeve abuts against the rear end face of the seat, and the end of the elastic sleeve is limited outside the annular flange.

8. The squeeze-type arterial puncture needle according to claim 3, characterized in that, The seat body has an annular lug on the outer side near the rear end.

9. The squeeze-type arterial puncture needle according to claim 3, characterized in that, The seat body has a sealing ring groove at the seat opening, and a sealing ring is placed inside the sealing ring groove. The sealing ring is used to seal the gap between the seat cover and the seat body.

10. The squeeze-type arterial puncture needle according to any one of claims 1-9, characterized in that, The steel needle has a blood-flowing cavity inside; the steel needle has a sharp needle tip at the front end and a transparent blood storage sac at the rear end that communicates with the blood storage cavity, and the transparent blood storage sac has a vent hole on its wall.

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