Puncture needle assembly without blood spraying

Abstract

The utility model discloses a blood-spray-free puncture needle assembly which comprises a trocar, a puncture needle, an extension tube and a valve, a puncture needle tube is fixed at the head end of a puncture needle handle, and the puncture needle tube is inserted into the trocar tube from the trocar handle and exposed out of the head end of the trocar tube; the valve is fixed in the trocar handle and is positioned between the puncture needle handle and the trocar handle, or the valve is fixed at the tail end of the extension tube; the inlet end of the extension tube is detachably connected with the tail end of the puncture needle handle and is designed to allow blood to flow in but prevent the blood from flowing out of the extension tube; when the puncture needle tube is inserted into the valve, the valve surrounds the puncture needle tube, so that blood can only flow into the extension tube through the puncture needle tube; when the needle tube of the puncture needle is pulled out, the valve is automatically closed by means of elasticity, so that blood can only be closed in the trocar handle. By means of the blood-spraying-free puncture needle, blood-spraying-free puncture can be achieved, and doctors are prevented from being infected or the operation environment is prevented from being polluted.

Description

Technical Field

[0001] The utility model relates to a non-bleeding puncture needle assembly, belonging to the technical field of medical devices. Background Art

[0002] When performing interventional therapy, doctors usually choose to insert a catheter through an arterial blood vessel (such as the femoral artery). This process needs to be carried out with the assistance of an imaging diagnostic device. The specific operation steps include: using a puncture needle to penetrate the blood vessel wall, then inserting a guide wire, introducing the catheter through the guide wire, and finally placing the catheter into the aorta. Currently, two techniques are mainly used for femoral artery puncture: the classic Seldinger technique and the modified Seldinger method.

[0003] The operation steps of the classic Seldinger technique are as follows: First, use a puncture needle with a stylet to penetrate the front and rear walls of the blood vessel, then withdraw the stylet, and slowly pull out the needle until blood spurts out from the needle tail. Next, quickly insert the guide wire, pull out the needle, and introduce the catheter through the guide wire. In contrast, the modified Seldinger method is more convenient and safe. It uses a puncture needle without a stylet to directly puncture the blood vessel percutaneously. Once the puncture needle penetrates the front wall of the blood vessel and enters the blood vessel, blood will spurt out from the needle tail. At this time, the guide wire and catheter can be introduced. The advantage of the modified Seldinger method is that it does not need to penetrate the posterior wall of the blood vessel, thus improving the success rate and reducing complications. Although the modified Seldinger method is more commonly used in interventional therapy, blood spraying may still occur during the puncture process. If the patient carries the hepatitis B virus or the HPV virus, this will pose a potential risk to medical staff or cleaning staff. Therefore, medical staff need to take appropriate protective measures during the operation to ensure their own and others' safety.

[0004] In the Chinese utility model with the patent number ZL 200920024471.0, a bleeding-proof arterial needle head is disclosed. As Figure 1 shown, a transparent hose 100 is connected beside the needle tail close to the needle head. The lumen of the transparent hose is communicated with the hollow needle lumen. The distal end of the hose is semi-closed, and there is a round hole in the middle. The diameter of the round hole is smaller than the inner diameter of the transparent hose. There is a small ball in the transparent hose. The diameter of the small ball is equal to the inner diameter of the transparent hose. There is a film at the needle tail, and there are cross-shaped cracks 200 on the film. The guide wire can enter the hollow needle lumen through the cracks. This utility model avoids the disadvantage of more blood flowing out after puncturing the arterial blood vessel and exchanging the guide wire with the previous ordinary needle head. However, the movement of the small ball in the transparent hose may not be smooth enough, affecting the blood flow and blocking effect. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a non-bleeding puncture needle assembly.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] According to the first aspect of the embodiments of the present utility model, a non-jetting blood puncture needle assembly is provided, including a trocar, a puncture needle, an extension tube, and a valve; wherein,

[0008] The trocar includes a trocar handle and a trocar cannula,

[0009] The puncture needle includes a puncture needle cannula and a puncture needle handle. The puncture needle cannula is fixed at the head end of the puncture needle handle. The puncture needle cannula is inserted into the trocar cannula from the trocar handle and protrudes from the head end of the trocar cannula;

[0010] The valve is fixed inside the trocar handle and is located between the puncture needle handle and the trocar handle; alternatively, the valve is fixed at the tail end of the extension tube;

[0011] The inlet end of the extension tube is detachably connected to the tail end of the puncture needle handle and is designed to allow blood to flow in but prevent blood from flowing out of the extension tube;

[0012] In a state where the puncture needle cannula is inserted into the valve, the valve surrounds the puncture needle cannula, enabling blood to flow into the extension tube through the puncture needle cannula; in a state where the puncture needle cannula is withdrawn, the valve automatically closes by elasticity, confining the blood inside the trocar handle.

[0013] Preferably, the extension tube is a flexible tube or a rigid tube,

[0014] The extension tube is designed to form negative pressure or normal pressure inside the extension tube so as not to affect the inflow of the blood.

[0015] Preferably, the extension tube is a syringe or a deformable flexible tube.

[0016] Preferably, the extension tube is a rigid tube, and the tail end of the extension tube is open and sealed with a breathable paper.

[0017] According to the second aspect of the embodiments of the present utility model, a non-jetting blood puncture needle assembly is provided, including a puncture needle, a valve, and a breathable paper; wherein,

[0018] The puncture needle includes a puncture needle cannula and a puncture needle handle;

[0019] The puncture needle cannula is fixed at the head end of the puncture needle handle;

[0020] The breathable paper is arranged at the tail end of the puncture needle handle and is designed to allow gas to enter the puncture needle handle but prevent blood from flowing out;

[0021] The valve is fixed on the puncture needle;

[0022] The valve has an opening; in the state where the puncture needle cannula is inserted, the puncture needle cannula passes through the opening; in the state where the puncture needle cannula is withdrawn, the valve automatically closes.

[0023] Preferably, the non-blood-spurting puncture needle assembly further includes an extension tube;

[0024] The extension tube is a Y-shaped tube, including two branches with open ends, and one end is closed by the valve and the other end is closed by the breathable paper;

[0025] The head end of the Y-shaped tube is connected to the tail end of the puncture needle handle.

[0026] Preferably, the non-blood-spurting puncture needle assembly further includes a trocar, and the trocar includes a trocar handle and a trocar cannula;

[0027] The valve is located between the trocar handle and the puncture needle handle to form a closed cavity in the trocar handle.

[0028] Preferably, the non-blood-spurting puncture needle assembly further includes an extension tube;

[0029] The handle insertion end of the puncture needle handle is inserted into the interior of the trocar handle,

[0030] The valve is fixed inside the trocar handle and is located between the handle insertion end and the trocar cannula, so that the blood from the trocar cannula can only enter the valve.

[0031] Preferably, the handle insertion end of the puncture needle handle is inserted into the interior of the trocar handle,

[0032] The valve is fixed inside the trocar handle and is located between the handle insertion end and the trocar cannula, so that the blood from the trocar cannula can only enter the valve.

[0033] Preferably, the handle insertion end of the puncture needle handle is outside the trocar handle,

[0034] The valve closes the trocar handle and is fixed between the handle insertion end and the trocar cannula, so that the blood from the trocar cannula can only enter the trocar handle.

[0035] Preferably, the valve is a concave structure, a mountain-shaped structure or a sheet structure.

[0036] Preferably, a positioning ring is further arranged between the puncture needle and the trocar for fixing the relative positions of the puncture needle and the trocar.

[0037] Compared with the prior art, the utility model has the following technical effects:

[0038] 1) By combining a breathable paper and a valve, or by combining an extension tube and a valve that has no effect on blood flow but can prevent blood from flowing out, a closed cavity is formed inside the trocar, and a closed cavity is also formed inside or outside the puncture needle to enclose the blood from the trocar or the puncture needle in the closed cavity, achieving bloodless puncture and avoiding doctors from being infected or the surgical environment from being contaminated;

[0039] 2) There is almost no change in the structural design of the puncture needle or the trocar. This has three advantages: First, it reduces the time for doctors to learn and adapt to new tools, accelerating the popularization and application of the technology; Second, it maintains the original puncture feel of doctors, helping to maintain and even improve the success rate of puncture; Finally, the simplified design also helps to reduce production costs, making this innovative technology more competitive in the market;

[0040] 3) The capacity design of the extension tube can be changed according to needs, or extension tubes of different specifications or shapes can be replaced to ensure that blood will not overflow. Description of the Drawings

[0041] Figure 1 is a schematic structural diagram of a puncture needle in the prior art;

[0042] Figure 2 is a schematic diagram of the overall structure of the bloodless puncture needle assembly provided by the first embodiment of the utility model;

[0043] Figure 3 is Figure 2 a partially enlarged schematic structural diagram of the connection between the trocar and the puncture needle in

[0044] Figure 4 is Figure 2 a three-dimensional structural diagram of the valve in

[0045] Figure 5 is a schematic diagram of the overall structure of the bloodless puncture needle assembly provided by the second embodiment of the utility model;

[0046] Figure 6A is a schematic structural diagram of an extension tube in the bloodless puncture needle assembly provided by the third embodiment of the utility model;

[0047] Figure 6B is another schematic structural diagram of an extension tube in the bloodless puncture needle assembly provided by the third embodiment of the utility model;

[0048] Figure 7 Schematic diagram of the overall structure of the non-blood-spraying puncture needle assembly provided by the fourth embodiment of the present invention;

[0049] Figure 8 Schematic diagram of the overall sectional structure of the non-blood-spraying puncture needle assembly provided by the fifth embodiment of the present invention;

[0050] Figure 9 Schematic diagram of the overall structure of the non-blood-spraying puncture needle assembly provided by the sixth embodiment of the present invention;

[0051] Figure 10A is Figure 9 Schematic diagram of the three-dimensional structure of the valve in

[0052] Figure 10B is Figure 9 Schematic diagram of the sectional structure of the valve in

[0053] Figure 11 Schematic diagram of the overall structure of the non-blood-spraying puncture needle assembly provided by the seventh embodiment of the present invention;

[0054] Figure 12 is Figure 11 Enlarged schematic diagram of the partial structure shown by circle A in

[0055] Figure 13 Schematic diagram of the sectional structure of the non-blood-spraying puncture needle assembly provided by the eighth embodiment of the present invention. Detailed implementation manners

[0056] The technical content of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] First embodiment

[0058] As Figure 2 shown, the first embodiment of the present invention provides a non-blood-spraying puncture needle assembly, including a trocar 1, a puncture needle 2, a valve 3, and an extension tube 4A. Among them, the trocar 1 and the extension tube 4A are respectively installed at both ends of the puncture needle 2.

[0059] As Figure 3 shown, the trocar 1 includes a trocar handle 11 and a trocar cannula 12. The trocar handle 11 has a Luer structure and can be sleeved with the puncture needle 2. The trocar cannula 12 is fixed at the head end of the trocar handle 11 and has a hollow thin tube structure. The specific structure of the trocar is a conventional design and will not be elaborated here. In the present invention, the head end refers to the end facing the patient's body; the tail end refers to the other end opposite to the head end (away from the body).

[0060] The puncture needle 2 includes a puncture needle cannula 21 and a puncture needle handle 22. The puncture needle cannula 21 is fixed to the head end of the puncture needle handle 22, and its length is adapted to the length of the trocar 1, so as to ensure that when it is inside the trocar cannula 12, the head end of the puncture needle cannula 21 can extend out of the trocar cannula 12 (exposed from the trocar cannula 12 to achieve puncture). The puncture needle handle 22 includes a handle insertion end 221 and a handle tail end 222. The handle insertion end 221 is inserted into the inside of the trocar handle 11, so that the puncture needle cannula 21 fixed on the handle insertion end 221 can extend into the trocar cannula 12 and extend out from the head end of the trocar cannula 12 (because the puncture needle cannula 21 is longer).

[0061] Moreover, when the puncture needle 2 is plugged into the trocar 1, a cavity 10 is formed between the inside of the trocar handle 11 and the handle insertion end 221 for accommodating the valve 3. In other words, the inner cavity of the trocar handle 11 of the present utility model is longer than the length of the handle insertion end 221 of the puncture needle handle 22, so that the cavity 10 can be formed between the two.

[0062] As Figure 3 and Figure 4 shown, the valve 3 in this embodiment is made of silica gel, and is a hollow cylindrical structure with a longitudinal section being concave (U-shaped), and has an opening 30 at the head end. The valve 3 is clamped in the cavity 10 inside the trocar handle 11, and the opening 30 faces the trocar cannula 12. The outer surface of the valve 3 is close to the inner surface of the trocar handle 11, and the opening 30 surrounds the trocar cannula 12. Therefore, the blood flowing in from the trocar cannula 12 enters the inner cavity of the valve 3 through the opening 30 and will not enter the cavity 10.

[0063] A through hole 31 is provided at the center line position of the valve 3. The through hole 31 is a cross-shaped opening in this embodiment. It can be understood that since silica gel itself has elasticity, the through hole 31 in the middle of the valve 3 will only open under the action of an external force (for example, being squeezed open by the puncture needle cannula 21 to expose a gap); it is always in a closed state without the action of an external force. This structure enables the valve 3 to play two roles in the trocar handle 11: forming a blood isolation layer and allowing the puncture needle cannula 21 made of stainless steel material to pass through.

[0064] As Figure 2As shown, the extension tube 4A is a thin tube (with a thickness less than or equal to 0.1 mm), which has an inlet end 41 and a tail end 42, and the tail end 42 is closed by a breathable paper 7. A Luer structure is adopted at the inlet end 41 for connecting to the handle tail end 222 of the puncture needle 2 to allow blood to enter the inner cavity of the extension tube 4A from the puncture needle tube 21. Since the breathable paper 7 closes the port of the tail end 42 of the extension tube 4A, the extension tube 4A becomes a lumen that can only discharge gas and cannot flow out liquid. This is because, since the breathable paper 7 allows gas to pass through and does not form pressure in the lumen of the extension tube 4A, under normal circumstances, the human blood pressure is greater than the atmospheric pressure, prompting blood to automatically enter the inner cavity of the handle tail end 222 from the puncture needle tube 21, and then enter the extension tube 4A through the inlet end 41. However, the breathable paper 7 prevents the blood from flowing out of the lumen.

[0065] Preferably, scales are provided on the outer wall of the extension tube 4A, so that it can be used to assist in judging whether the puncture needle 2 is in place according to whether the amount of blood flowing into the extension tube 4A reaches the expected value. For example: if the blood flowing into the lumen of the extension tube 4A reaches 1 - 1.5 ml, it indicates that the puncture needle 2 is in place, and the next step can be carried out; if the blood flowing into the lumen of the extension tube 4A is less than 0.5 ml, it indicates that the puncture needle 2 is not in place, and the position of the puncture needle tube 21 needs to be adjusted.

[0066] In this embodiment, during puncture, the puncture needle tube 21 passes through the cross-shaped opening 31 on the valve 3 and penetrates the valve 3. The elasticity of the silicone of the valve 3 can ensure that the valve 3 closely surrounds the puncture needle tube 21. At this time, blood can only flow into the extension tube 4A through the puncture needle tube 21. Since the extension tube 4A is closed by the breathable paper 7, only gas can be discharged, and blood will not overflow. When the puncture needle 2 is withdrawn, the cross-shaped opening 31 on the valve 3 automatically closes under the action of the silicone elasticity. At this time, the blood flows from the cannula needle tube 12 through the opening 30 into the inner cavity of the valve 3 and will not flow out outside the outer cannula 1.

[0067] It can be seen that in this embodiment, during the puncture process, the puncture needle tube 21 passes through the opening 31, and the extension tube 4A is used to collect blood; at the end of the puncture, the puncture needle tube 21 is taken out from the opening 31, and the opening 31 returns to the closed state, and the valve 3 is used to collect the blood from the cannula needle tube 12. Therefore, by combining the valve 3 and the extension tube 4A with the breathable paper 7, it is possible to prevent blood from flowing out in both cases during the puncture process and after the puncture action, so that there is no blood contamination / infection throughout the process, effectively reducing the risk of doctors being infected due to blood spillage during the operation.

[0068] Second Embodiment

[0069] As Figure 5As shown, based on the first embodiment, the second embodiment of the present utility model provides a non-bleeding puncture needle assembly, including a trocar 1, a puncture needle 2, a valve 3, and an extension tube 4B.

[0070] Specifically, the extension tube 4B in this embodiment is a conventional syringe (without a needle). Therefore, its head end can be connected to the puncture needle 2. Before being connected to the puncture needle 2, the air in the syringe is pre-emptied to form a negative pressure. When the syringe is connected to the handle tail end 222 of the puncture needle 2, a closed space is formed between the syringe and the puncture needle 2 to accommodate the blood ejected from the artery. Moreover, because the syringe is in a negative pressure state, it will not impede the flow of blood, and the blood can smoothly enter the inner cavity of the syringe. When there is no more blood flowing out, the puncture needle 2 and the extension tube 4B can be removed from the trocar 1 together. After that, a part of the blood flows from the trocar needle tube 11 into the cavity of the valve 3 and is sealed there. Therefore, no blood will flow outside the puncture needle 2 during the entire puncture process.

[0071] Third Embodiment

[0072] As Figure 6A and Figure 6B shown, based on the second embodiment, the third embodiment of the present utility model provides a non-bleeding puncture needle assembly. Compared with the second embodiment, the difference in this embodiment is that: the structure of the extension tube 4C is different from that of the extension tube 4B in the second embodiment.

[0073] Specifically, the extension tube 4B in this embodiment is replaced by a plastic compressible or squeezable straw. The extension tube 4C is a flexible tube that can be deformed by finger pressing, different from the hard tube (which cannot be deformed during the puncture process) of the extension tube 4B in the second embodiment. As Figure 6A shown, the extension tube 4C is a plastic straw with wrinkles and can be compressed, pre-compressed to form a negative pressure inside the extension tube 4C. The extension tube 4C with the formed negative pressure is connected to the handle tail end 222, enabling blood to flow into the inner cavity of the extension tube 4C, playing a role similar to that of the extension tube 4B. Additionally, as Figure 6B shown, the extension tube 4C can also adopt another form of squeezable plastic straw.

[0074] Except for the above structure, the rest of the structure in this embodiment is the same as that of the first embodiment and will not be elaborated here.

[0075] Fourth Embodiment

[0076] As Figure 7 shown, a non-bleeding puncture needle assembly provided by the fourth embodiment of the present utility model includes a puncture needle 2, a valve 3A, an extension tube 4D, and a breathable paper 7A. Among them, there is no trocar 1 in this embodiment, and the puncture is directly performed using the puncture needle 2.

[0077] Specifically, the extension tube 4D in this embodiment is a Y-shaped tube. The inlet end 41 is connected to the handle tail end 221 of the puncture needle 2 by a Luer connector. A valve 3 is installed at the tail end of one branch tube, and a breathable paper 7 is installed at the tail end of the other branch tube.

[0078] After connecting the inlet end 41 to the handle tail end 221 of the puncture needle 2, the extension tube 4D and the puncture needle 2 become an integral body. Then, the puncture needle tube 21 enters the blood vessel. Since the breathable paper 7 ensures that the pressure in the extension tube 4D is the atmospheric pressure (lower than the human blood pressure), the blood entering the puncture needle 2 can quickly enter the extension tube 4D. The guide wire 200 passes through the opening 30 on the valve 3 and enters the extension tube 4D, and then enters the puncture needle tube 21 of the puncture needle 2 until it extends from the puncture needle tube 21 into the blood vessel cavity. For this reason, blood flow can be observed in the branch tube where the breathable paper 7 is located, so that the doctor can judge the puncture position of the puncture needle tube 21.

[0079] It can be seen that in this embodiment, by using the breathable paper 7 and the valve 3, two branches are constructed in the extension tube (Y-shaped tube) 4D. Among them, one branch is the branch tube where the breathable paper 7 is located, providing a branch that can only discharge gas and liquid cannot flow out, for blood collection. The other branch is the branch tube where the valve 3 is located, providing a delivery branch for the guide wire 200 to enter.

[0080] Compared with the design in the first embodiment where the valve 3 is located between the puncture needle 2 and the trocar 1, the design of this embodiment enables the doctor to operate according to the existing habit (judging the insertion position of the puncture needle 2 by seeing blood in the puncture needle 2). The delivery of the guide wire is very easy, and it is more suitable for popularization and application.

[0081] Fifth Embodiment

[0082] As Figure 8 shown, the difference between this embodiment and the Figure 3 first embodiment shown is that the puncture needle 2 does not need to be connected to the extension tube, but a penetration paper 7 is provided at the handle tail end of the puncture needle 2.

[0083] Specifically, a non-bleeding puncture needle assembly provided in this embodiment includes a trocar 1, a puncture needle 2, and a valve 3. Among them, the head end of the puncture needle 2 is connected to the trocar 1, and a breathable paper 7 is provided at the tail end.

[0084] Specifically, the puncture needle 2 includes a puncture needle tube 21 and a puncture needle handle 22. The puncture needle tube 21 is fixed to the head end of the puncture needle handle 22. The puncture needle handle 22 includes a handle insertion end 221 and a handle tail end 222. A cavity 10 is formed between the inside of the trocar handle 11 and the handle insertion end 221, and the valve 3 is accommodated therein.

[0085] The handle insertion end 221 of the puncture needle handle 22 is inserted into the inside of the trocar handle 11, so that the puncture needle tube 21 fixed on the handle insertion end 221 can extend into the trocar needle tube 12 and protrude from the tail end of the trocar needle tube 12. The handle tail end 222 is integrally formed with the handle insertion end 221, and a breathable paper 7 is provided at the tail end. The breathable paper 7 is the same as that of the first embodiment and will not be elaborated here.

[0086] The valve 3 is made of silica gel and has a hollow cylindrical structure with a concave (U-shaped) longitudinal section, and has an opening 30 at the head end. The valve 3 is clamped in the cavity 10 inside the trocar handle 11, and the opening 30 faces the trocar needle tube 12. A through hole 31 is provided at the center line position of the valve 3 to allow the puncture needle tube 21 made of stainless steel material to pass through.

[0087] Similarly, the breathable paper 7 enables the puncture needle 2 to accommodate blood without flowing out. Even when the puncture needle 2 is withdrawn from the trocar 1, part of the blood from the trocar needle tube 12 will only enter the inside of the valve 3 and will not flow out. Therefore, the non-jetting blood puncture needle assembly of this embodiment can also avoid the problems of blood contamination or infection during the operation.

[0088] This embodiment adopts an innovative simplified design. Only the handle tail end 222 of the puncture needle 2 with a conventional design is sealed with the breathable paper 7, so the cost is lower and it is beneficial to popularize.

[0089] Sixth Embodiment

[0090] As Figure 9 、 Figure 10A and Figure 10B shown, compared with the first embodiment, the difference in this embodiment is that the valve 3' is externally disposed outside the trocar 1.

[0091] The non-jetting blood puncture needle assembly of this embodiment includes a trocar 1, a puncture needle 2, a valve 3' and an extension tube 4E. Among them, the trocar 1 is sleeved on the head end of the puncture needle 2, and both are standard parts, which is a conventional design and will not be elaborated here. The trocar 1 includes a trocar handle 11 and a trocar needle tube 12. The puncture needle tube 21 of the puncture needle 2 extends from the trocar handle 11 into the trocar needle tube 12 and exposes from the head end of the trocar needle tube 12. However, the handle insertion end 221 of the puncture needle handle 22 is outside the trocar handle 11. In other words, the valve 3' is located between the trocar handle 11 and the handle insertion end 221 of the puncture needle handle 22.

[0092] Specifically, the valve 3' in this embodiment is provided at one end of the trocar handle 11 of the trocar 1 away from the trocar needle tube 12. The valve 3' forms a closed cavity inside the trocar handle 11, so as to accommodate the blood flowing out during puncture and avoid flowing outside the trocar handle 11.

[0093] The valve 3' is made of silica gel. The valve 3' includes a base 34, a plug body 32, and a side wall 33, and has a hollow cylindrical structure with a mountain-shaped (W-shaped) longitudinal section. An opening 30 is provided at the head end of the valve 3', and the opening 30 faces the cannula needle tube 12 to allow the tail end of the cannula handle 11 to be inserted into the opening 30, so as to press the valve 3' onto the cannula handle 11. In the combined state of the valve 3' and the cannula handle 11, the plug body 32 of the valve 3' enters the inside of the cannula handle 11, thereby forming a closed cavity inside the cannula handle 11; the side wall 33 surrounds the outer periphery of the cannula handle 11 to play a fixing role.

[0094] A through hole 31 (cross-shaped opening) is provided at the central position of the plug body 32 to allow the puncture needle tube 21 to pass through and enter the cannula needle tube 12. Since the puncture needle tube 21 passes through the hole 31 (cross-shaped opening) and is inserted into the cannula needle tube 12, the puncture needle handle 22 is located outside the cannula handle 11. This increases the length of the puncture needle tube 21 so that it can protrude from the head end of the cannula needle tube 12.

[0095] When the puncture needle tube 21 pierces the valve 3' for puncture, blood is injected into the puncture needle handle 22 along the puncture needle tube 21, and then enters the extension tube 4E connected to the tail end of the puncture needle handle 22. When the puncture needle tube 21 is withdrawn from the valve 3', blood flows into the cannula handle 11 along the cannula needle tube 12 and is sealed inside the cannula handle 11 by the valve 3'. It can be seen that during and after the puncture process, there will be no contamination or infection caused by blood.

[0096] Preferably, an arc-shaped groove is provided near the hole 31 to make the silica gel at the hole 31 thinner, so as to increase the elasticity and facilitate the puncture needle tube 21 to pass through.

[0097] Except for the above structure, the rest of the structure of this embodiment is the same as that of the first embodiment, and will not be described in detail here.

[0098] Seventh Embodiment

[0099] As Figure 11 shown, this embodiment is similar to the sixth embodiment, the difference being that a positioning ring 8 is added.

[0100] Figure 12 As shown in the partial enlarged view, the positioning ring 8 positions the puncture needle tube 21 to ensure the relative position of the puncture needle and the cannula is fixed.

[0101] Eighth Embodiment

[0102] As Figure 13As shown, the bloodless puncture needle assembly provided in this embodiment is similar to the bloodless puncture needle assembly provided in the fifth embodiment. However, the valve 3' in the bloodless puncture needle assembly provided in this embodiment is located outside the trocar 1.

[0103] The bloodless puncture needle assembly of this embodiment includes a trocar 1, a puncture needle 2, and a valve 3'. The specific structures of the trocar 1 and the valve 3' are the same as those in the sixth embodiment and will not be elaborated here.

[0104] The structure of the puncture needle 2 is the same as that of the puncture needle 2 in the fifth embodiment, that is, a breathable paper 7 is provided at the tail end.

[0105] Based on a principle similar to that of the fifth embodiment, the bloodless puncture needle assembly of this embodiment can also avoid problems of contamination or infection caused by blood outflow.

[0106] In summary, the bloodless puncture needle assembly provided by the present utility model significantly improves the safety and efficiency of the medical puncture process through innovative design. This bloodless puncture needle assembly combines a breathable paper and a valve to form a closed cavity. This design ingeniously ensures unobstructed blood flow while effectively preventing blood backflow. It can not only collect the blood in the puncture needle but also capture the blood in the trocar, thus ensuring no blood jet during the entire puncture process and greatly reducing the risk of doctors being infected and the surgical environment being contaminated.

[0107] In addition, the structural design of this bloodless puncture needle assembly makes minimal changes to the existing puncture needle or trocar, which has three advantages: First, it reduces the time for doctors to learn and adapt to new tools, accelerating the popularization and application of the technology; second, it maintains the original puncture feel of doctors, helping to maintain or even improve the success rate of puncture; finally, the simplified design also helps to reduce production costs, making this innovative technology more competitive in the market.

[0108] This bloodless puncture needle assembly also particularly uses a Luer connector to connect the extension tube, and the design form of the extension tube is diverse. Doctors can choose extension tubes of different specifications or forms according to their surgical habits and needs. This flexibility further enhances the safety and efficiency of surgical operations, enabling doctors to perform precise medical operations more confidently.

[0109] It should be noted that the above-mentioned multiple embodiments are only examples, and the technical solutions of each embodiment can be combined, all within the protection scope of the present utility model. For example, the valves in each embodiment should be in a concave structure, a mountain-shaped structure, or a sheet structure.

[0110] The above has provided a detailed description of the non-blood-spurting puncture needle assembly provided by the present utility model. For those of ordinary skill in the art, any obvious changes made to it without departing from the substantial content of the present utility model will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A blood-free puncture needle assembly, characterized in that It includes a trocar, a puncture needle, an extension tube and a valve; wherein, The trocar comprises a trocar handle and a trocar tube; The puncture needle comprises a puncture needle tube and a puncture needle handle, wherein the puncture needle tube is fixed to the head end of the puncture needle handle, and the puncture needle tube is inserted into the trocar needle tube from the trocar handle and exposed from the head end of the trocar needle tube; The valve is fixed in the trocar handle and is located between the puncture needle handle and the trocar handle; or, the valve is fixed at the tail end of the extension tube; The inlet end of the extension tube is detachably connected to the rear end of the puncture needle handle and is designed to allow blood to flow in but prevent blood from flowing out of the extension tube; When the puncture needle tube is inserted into the valve, the valve surrounds the puncture needle tube so that blood can only flow into the extension tube through the puncture needle tube; when the puncture needle tube is pulled out, the valve automatically closes using elasticity so that blood can only be sealed in the trocar handle.

2. The blood-free puncture needle assembly according to claim 1, characterized in that: The extension tube is a hose or a hard tube; The extension tube is designed to form negative pressure or normal pressure inside the extension tube so as not to affect the inflow of the blood.

3. The blood-free puncture needle assembly according to claim 2, characterized in that: The extension tube is a syringe, or a deformable hose.

4. The blood-free puncture needle assembly according to claim 2, characterized in that: The extension tube is a hard tube, and the rear end of the extension tube is open and closed by breathable paper.

5. A blood-free puncture needle assembly, characterized in that It includes a puncture needle, a valve and a breathable paper; wherein, The puncture needle comprises a puncture needle tube and a puncture needle handle; The puncture needle tube is fixed to the head end of the puncture needle handle; The breathable paper is arranged at the rear end of the puncture needle handle, and the breathable paper is designed to allow gas to enter the puncture needle handle but prevent blood from flowing out; The valve is fixed on the puncture needle. The valve has an opening, and when the puncture needle tube is inserted, the puncture needle tube passes through the opening; when the puncture needle tube is pulled out, the valve is automatically closed.

6. The blood-free puncture needle assembly according to claim 5, characterized in that Also includes extension tube, The extension tube is a Y-shaped tube, comprising two branch tubes with unclosed ports, one of which is closed by the valve and the other is closed by the breathable paper; The head end of the Y-shaped tube is connected to the tail end of the puncture needle handle.

7. The blood-free puncture needle assembly according to claim 5, characterized in that Also includes a trocar, The trocar comprises a trocar handle and a trocar tube; The valve is located between the trocar handle and the puncture needle handle, forming a closed cavity in the trocar handle.

8. The blood-free puncture needle assembly according to claim 7, characterized in that Also includes extension tube, The handle insertion end of the puncture needle handle is inserted into the interior of the trocar handle. The valve is fixed inside the trocar handle and is located between the handle insertion end and the trocar tube, so that blood from the trocar tube can only enter the valve.

9. The blood-free puncture needle assembly according to claim 8, characterized in that: The handle insertion end of the puncture needle handle is outside the trocar handle, The valve closes the trocar handle and is fixed between the handle insertion end and the trocar tube, so that blood from the trocar tube can only enter the trocar handle.

10. The non-blood-spraying puncture needle assembly according to any one of claims 5 to 9, characterized in that: The valve is a concave structure, a mountain-shaped structure or a sheet-shaped structure.

11. The blood-free puncture needle assembly according to claim 9, characterized in that: A positioning ring is also provided between the puncture needle and the trocar to fix the relative positions of the puncture needle and the trocar.

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