Central venous puncture needle, central venous catheter and central venous puncture method

Abstract

The present invention relates to a central venous puncture needle, a central venous catheter and a central venous puncture method, comprising a needle tube and a needle seat, the needle seat comprising a first connecting end, a second connecting end and a third connecting end, the first connecting end, the second connecting end and the third connecting end are connected through a flow channel arranged in the needle seat, one end of the needle tube is fixed to the first connecting end and connected to the flow channel, and the other end of the needle tube is configured with a needle tip; the first connecting end is provided with an isolation protection part, the isolation protection part comprises a flexible protective cover, the flexible protective cover is compressed and / or folded on the first connecting end, and is used to unfold along the length direction of the needle tube and cover at least a part of the guide wire during the process of catheterization; the puncture needle has a simple and compact structure, can be used to isolate the guide wire during the process of catheterization, thereby effectively preventing the guide wire sticky with blood from being directly exposed to the air, and can effectively prevent blood from splashing and forming aerosols in the air.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a central venous puncture needle, a central venous catheter and a central venous puncture method capable of preventing blood from splashing. Background Art

[0002] Central venous catheterization (also known as central venous catheterization) is widely used in cancer patients. Currently, common central venous catheterization routes include the internal jugular vein, subclavian vein, and femoral vein. It is mainly used for central venous pressure measurement, hemodynamic monitoring, temporary and permanent pacing, intravenous hypertrophy, electrophysiological examination, etc.

[0003] When performing central venous catheterization, a central venous catheter is usually required. The central venous catheter usually includes a puncture needle, a guide wire and a catheter. The operation steps of central venous catheterization are usually as follows:

[0004] ① The puncture needle punctures the target blood vessel;

[0005] ② inserting a guide wire through the puncture needle, that is, using the puncture needle as a tunnel so that the guide wire is inserted into the target blood vessel through the puncture needle;

[0006] ③ Withdraw the puncture needle, that is, pull out the puncture needle from the outside of the guide wire;

[0007] ④ Using the guide wire as a guide, place the catheter on the guide wire, and insert one end of the catheter into the target blood vessel through the guide wire so that the catheter is placed at the predetermined position;

[0008] ⑤Finally, remove the guide wire from the inside of the catheter to complete the catheterization.

[0009] During the entire catheterization process, because the guide wire is first inserted into the target blood vessel and then withdrawn from the target blood vessel, during this process, the outer surface of the guide wire will be sticky with a lot of blood (that is, the guide wire will bring blood out of the target blood vessel). In the prior art, during the process of withdrawing the puncture needle and withdrawing the guide wire, the guide wire sticky with blood will be completely exposed to the air, which will not only contaminate nearby surgical instruments, such as surgical covers, bed sheets, etc., but also cause blood to splash and form aerosols in the air, which urgently needs to be solved. Summary of the invention

[0010] The purpose of the present invention is to improve the deficiencies in the prior art and provide a puncture needle with a simple and compact structure, which can isolate the guide wire during the catheterization process, thereby effectively preventing the guide wire sticky with blood from being directly exposed to the air, and effectively preventing blood from splashing and forming aerosols in the air.

[0011] The first aspect of the present invention aims to solve the problem that during the catheterization process, a guide wire sticky with blood will be directly exposed to the air, and provides a central venous puncture needle that can prevent blood from splashing, including a needle tube and a needle seat, the needle seat including a first connecting end, a second connecting end and a third connecting end, the first connecting end, the second connecting end and the third connecting end are connected by a flow channel arranged in the needle seat, one end of the needle tube is fixed to the first connecting end and connected to the flow channel, and the other end of the needle tube is configured with a needle tip; the first connecting end is provided with an isolation protection part, the isolation protection part includes a flexible protective cover, the flexible protective cover is compressed and / or folded on the first connecting end, and is used to unfold along the length direction of the needle tube and cover at least a part of the guide wire during the catheterization process. In the present solution, the needle seat is a three-way structure to meet the operational requirements of the catheterization process. Since the first connecting end is connected to the needle tube, and the second connecting end and the third connecting end are respectively connected to the first connecting end, during the catheterization process, the second connecting end and the third connecting end can cooperate with each other, the second connecting end can be connected to the syringe, and the guide wire can be inserted into the blood vessel from the third connecting end through the first connecting end and the needle tube; after one end of the guide wire is successfully inserted into the blood vessel, and when the puncture needle needs to be withdrawn, the medical staff can manually unfold the flexible protective cover so that the flexible protective cover can cover the part exposed outside the body. The guide wire is placed in the flexible protective sheath to isolate the blood on the outside of the guide wire caused by the needle withdrawal process; when the catheter is inserted, the guide wire is in the flexible protective sheath, so that the entire sheath process can be carried out in the flexible protective sheath, and in the final process of withdrawing the guide wire, it can all be completed in the flexible protective sheath, so that the guide wire can be stored in the corresponding guide wire protection tube under the isolation protection of the flexible protective sheath. During the whole process, the guide wire sticky with blood is completely covered in the flexible protective sheath to achieve the purpose of isolation, thereby effectively preventing the guide wire sticky with blood from being directly exposed to the air, and effectively preventing blood from splashing and forming aerosols in the air.

[0012] Preferably, the flexible protective sleeve is a plastic film with a cylindrical structure, which is convenient for compression and storage and can cover the guide wire.

[0013] To facilitate the fixing of the flexible protective cover, one end of the flexible protective cover is further fixed to the first connecting end, so that the entire isolation protection part is stably fixed to the needle seat, and during use, especially during the process of withdrawing the puncture needle, the flexible protective cover can be conveniently disconnected from the first connecting end under the action of external force, so that the puncture needle can be smoothly separated from the flexible protective cover.

[0014] The second aspect of the present invention is to facilitate the compression and / or folding of the flexible protective sleeve to the minimum volume, and to make the flexible protective sleeve stably arranged on the needle seat. Furthermore, the isolation protection part also includes a storage cylinder, which is arranged on the outside of the first connecting end, and one end of the storage cylinder is fixed to the first connecting end, and the other end of the storage cylinder is provided with a first connecting part, and one end of the flexible protective sleeve is provided with a second connecting part adapted to the first connecting part, and one end of the flexible protective sleeve is detachably fixed to the storage cylinder through the cooperation of the second connecting part and the first connecting part, and the flexible protective sleeve is folded and / or stored between the outer wall of the storage cylinder and the first connecting end. In the present solution, by providing a storage tube, the flexible protective cover can be conveniently folded and / or stored inside the storage tube, so that the flexible protective cover can stably maintain a minimum volume state, and one end of the flexible protective cover can be detachably fixed to the storage tube through the cooperation of the second connecting part and the first connecting part, which can not only fix the flexible protective cover to prevent it from falling off, but also because the second connecting part will cooperate with the first connecting part at the end of the storage tube, it can have a certain blocking effect on the flexible protective cover, and can prevent the flexible protective cover from falling out of the storage tube.

[0015] In order to facilitate the setting of the second connection part, further, a first end is included, the first end is a ring structure, one end of the flexible protective sleeve is connected to the first end, and the second connection part is arranged on the first end, so that the first end can be detachably fixed to the storage tube through the cooperation between the second connection part and the first connection part.

[0016] Preferably, the second connection portion is an external thread provided on the first end, and the first connection portion is an internal thread provided on the storage tube, and the external thread is adapted to the internal thread.

[0017] Alternatively, the second connection portion is an internal thread provided on the first end, the first connection portion is an external thread provided on the storage tube, and the internal thread is adapted to the external thread. Through the cooperation of the internal thread and the external thread, a detachable threaded connection can be achieved.

[0018] Preferably, the other end of the flexible protective sleeve is connected to the storage tube.

[0019] The third aspect of the present invention is to solve the problem of the flexible protective sleeve being smoothly unfolded and detached from the needle seat without damage. Further, it also includes a second end, which is an annular structure. The second end is sleeved between the outer wall of the storage tube and the first connecting end, and the other end of the flexible protective sleeve is connected to the second end. By arranging the second end at the other end of the flexible protective sleeve, the other end of the flexible protective sleeve has a certain weight and a relatively regular shape, so that during the assembly process, the second end can be conveniently sleeved into the storage tube, so that it is more convenient to fold and / or store the flexible protective sleeve into the storage tube. In addition, by arranging the second end, there is no need to connect the flexible protective sleeve to the first connecting end or the storage tube. In actual use, as the first end of the flexible protective sleeve gradually moves away from the storage tube, the flexible protective sleeve can be gradually unfolded and detached from the storage tube, and finally the second end of the other end of the flexible protective sleeve can be driven to smoothly detach from the storage tube, thereby smoothly completing the unfolding function of the entire flexible protective sleeve.

[0020] To prevent the second end head from automatically detaching from the storage tube, further, the inner diameter of the first end head is smaller than the outer diameter of the second end head, so that the first end head can block the second end head inside, thereby effectively preventing the second end head from automatically detaching from the storage tube.

[0021] Preferably, the first end head and / or the second end head are made of rubber or plastic so as to have a certain flexibility and be more convenient to use.

[0022] Preferably, the outer diameter of the second end is smaller than or equal to the inner diameter of the storage tube, and the inner diameter of the second end is larger than the outer diameter of the first connecting end, so that the second end can be smoothly sleeved between the outer wall of the storage tube and the first connecting end.

[0023] Preferably, the needle seat is made of plastic.

[0024] A central venous catheter comprises a guide wire, a catheter and the puncture needle.

[0025] A fourth aspect of the present invention provides a central venous puncture method capable of preventing blood from splashing, comprising the central venous catheter, the method comprising the following steps:

[0026] Step 1: determine the puncture point, and insert the needle tip of the puncture needle into the target blood vessel through the puncture point;

[0027] Step 2, one end of the guide wire is inserted into the target blood vessel via the third connecting end, the flow channel and the needle tube;

[0028] Step 3, pull open the flexible protective cover so that the flexible protective cover is unfolded along the length direction of the needle tube and covers the needle tube between the puncture point and the needle seat;

[0029] Step 4: Move the needle holder in a direction away from the puncture point to withdraw the puncture needle and keep the guide wire in position unchanged; in this process, the puncture needle drives the flexible protective cover to unfold and covers the guide wire inside the flexible protective cover. When the flexible protective cover is fully unfolded, the flexible protective cover is separated from the needle holder;

[0030] Step 5: In the flexible protective sleeve, one end of the catheter is placed on the guide wire, and the guide wire is used to guide the catheter so that one end of the catheter is inserted along the guide wire to a predetermined position of the target blood vessel;

[0031] Step 6: In the flexible protective cover, the guide wire is pulled out from the inside of the catheter and stored in the guide wire protection tube. During the whole process, the guide wire is inside the flexible protective cover and will not be directly exposed to the air, which will not only not contaminate nearby surgical instruments, such as surgical covers, bed sheets, etc., but also will not cause blood splashing and can effectively avoid the formation of aerosols in the air.

[0032] Compared with the prior art, the central venous puncture needle, central venous catheter and central venous puncture method provided by the present invention can prevent blood from splashing out. The structure is simple and compact, and can isolate the guide wire during the catheterization process, thereby effectively preventing the guide wire sticky with blood from being directly exposed to the air, and can effectively prevent blood from splashing out and forming aerosols in the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the structure of an existing central venous puncture needle.

[0035] Figure 2 This is a schematic structural diagram of a central venous puncture needle capable of preventing blood from splashing provided in Example 1 of the present invention, wherein the flexible protective cover is in a compressed and / or folded state.

[0036] Figure 3 This is a schematic structural diagram of a central venous puncture needle capable of preventing blood from splashing provided in Example 1 of the present invention, wherein the flexible protective cover is in an unfolded state.

[0037] Figure 4 This is a schematic structural diagram of a central venous puncture needle capable of preventing blood from splashing provided in Example 2 of the present invention, wherein the flexible protective cover is in a compressed and / or folded state.

[0038] Figure 5 This is a partial cross-sectional view of a central venous puncture needle capable of preventing blood from splashing provided in Example 2 of the present invention, wherein the flexible protective cover is in a compressed and / or folded state.

[0039] Figure 6 This is a schematic structural diagram of a central venous puncture needle capable of preventing blood from splashing provided in Example 2 of the present invention, wherein the flexible protective cover is in an unfolded state.

[0040] Figure 7 This is a schematic diagram of a central venous puncture needle capable of preventing blood from splashing provided in Example 2 of the present invention, after the flexible protective cover is detached from the puncture needle.

[0041] Description of symbols in the figure

[0042] Needle tube 101, needle tip 102, needle seat 103, first connecting end 104, second connecting end 105, third connecting end 106,

[0043] Isolation protection part 200 , first end head 201 , flexible protection cover 202 , second end head 203 , storage tube 204 , first connection part 205 , second connection part 206 . DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0045] Example 1

[0046] See also Figure 1-Figure 3 In this embodiment, a central venous puncture needle capable of preventing blood from splashing is provided, comprising a needle tube 101 and a needle seat 103, wherein the needle seat 103 comprises a first connecting end 104, a second connecting end 105 and a third connecting end 106, wherein the first connecting end 104, the second connecting end 105 and the third connecting end 106 are connected via a flow channel arranged in the needle seat 103, one end of the needle tube 101 is fixed to the first connecting end 104 and connected to the flow channel, and the other end of the needle tube 101 is configured with a needle tip 102 for puncture; the needle seat 103 may be preferably made of plastic; Figure 1 As shown, as an example, the needle seat 103 can adopt the needle seat 103 commonly used in the prior art. For example, in order to facilitate the connection of the syringe, the second connecting end 105 can also be provided with a connector adapted to the syringe, which will not be repeated here;

[0047] like Figure 2 and Figure 3 As shown, in this embodiment, the first connecting end 104 is provided with an isolation protection part 200, and the isolation protection part 200 includes a flexible protective cover 202, and the flexible protective cover 202 is compressed and / or folded on the first connecting end 104, and is used to unfold and cover at least a part of the guide wire along the length direction of the needle tube 101 during the catheterization process. In this embodiment, the needle seat 103 is a three-way structure to meet the operation requirements of the catheterization process. Since the first connecting end 104 is connected to the needle tube 101, and the second connecting end 105 and the third connecting end 106 are respectively connected to the first connecting end 104, during the catheterization process, the second connecting end 105 and the third connecting end 106 can cooperate with each other, the second connecting end 105 can be connected to the syringe, and the guide wire can be inserted into the blood vessel from the third connecting end 106 and through the first connecting end 104 and the needle tube 101; after one end of the guide wire is successfully inserted into the blood vessel, and when the puncture needle needs to be withdrawn, the medical staff can manually unfold the flexible protective cover 202 so that the flexible protective cover 202 The guide wire that is exposed outside the body can be covered, thereby isolating the blood on the outside of the guide wire that is stained by the needle withdrawal process; when inserting the catheter, since the guide wire is in the flexible protective sheath 202, the entire sheath process can be carried out in the flexible protective sheath 202, and in the final process of withdrawing the guide wire, it can all be completed in the flexible protective sheath 202, so that the guide wire can be stored in the corresponding guide wire protection tube under the isolation protection of the flexible protective sheath 202. During the whole process, the guide wire that is sticky with blood is all covered in the flexible protective sheath 202, which plays the purpose of isolation, thereby effectively preventing the guide wire that is sticky with blood from being directly exposed to the air, and can effectively prevent blood from splashing and forming aerosols in the air.

[0048] like Figure 2 As shown, preferably, the flexible protective cover 202 may preferably be a plastic film with a tubular structure, which is convenient for compression and storage and can cover the guide wire.

[0049] To facilitate the fixing of the flexible protective cover 202, in a further solution, one end of the flexible protective cover 202 is fixed to the first connecting end 104. In this way, the entire isolation protection part 200 is stably fixed to the needle seat 103. During use, especially during the process of withdrawing the puncture needle, the flexible protective cover 202 can be conveniently disconnected from the first connecting end 104 under the action of external force, so that the puncture needle can be smoothly separated from the flexible protective cover 202.

[0050] When the puncture needle provided in this embodiment is used in conjunction with a guide wire and a catheter for central venous catheterization, the operation steps may be:

[0051] 1. The puncture needle punctures the target blood vessel. During this process, the flexible protective sleeve 202 is in a compressed and / or folded state;

[0052] 2. Insert the guide wire through the puncture needle, that is, insert one end of the guide wire into the target blood vessel through the third connecting end 106, the flow channel, and the needle tube 101 in sequence. During this process, the flexible protective sleeve 202 is in a compressed and / or folded state;

[0053] 3. Manually pull open the flexible protective cover 202, so that the flexible protective cover 202 is partially unfolded and covers the needle tube 101 between the puncture point and the needle seat 103 (there is a guide wire in the needle tube 101);

[0054] 4. Withdraw the puncture needle, that is, pull out the puncture needle from the outside of the guide wire. During this process, the needle seat 103 moves in the direction away from the puncture point, and drives the flexible protective cover 202 to continue to expand, and covers the guide wire inside, so that the blood adhering to the outer surface of the guide wire of the needle tube 101 during the process of separating from the guide wire is covered by the flexible protective cover 202 inside, thereby achieving the purpose of isolation protection; when the flexible protective cover 202 is fully expanded, the flexible protective cover 202 can be separated from the needle seat 103 under the action of tension, so that the flexible protective cover 202 can be separated from the puncture needle;

[0055] 5. Using the guide wire as a guide, the catheter is sheathed on the guide wire, and one end of the catheter is inserted into the target blood vessel through the guide wire, so that the catheter is placed at a predetermined position. In this process, the catheter is also inserted into the flexible protective sheath 202, that is, the part of the catheter remaining outside the body is covered in the flexible protective sheath 202, and the length of the guide wire remaining outside the body is greater than the length of the catheter remaining outside the body;

[0056] 6. Finally, the guide wire is pulled out from the inside of the catheter. In this process, the guide wire withdrawn from the target blood vessel will be stored in the guide wire protection tube inside the flexible protective sleeve 202 after being separated from the catheter to complete the recovery of the guide wire. In this process, the guide wire will not be directly exposed to the air, not only will it not contaminate nearby surgical instruments, such as surgical covers, bed sheets, etc., but it will also not cause blood splatter and can effectively avoid the formation of aerosols in the air.

[0057] Example 2

[0058] In order to compress and / or fold the flexible protective cover 202 to a minimum volume and stably arrange the flexible protective cover 202 on the needle seat 103, the main difference between the second embodiment and the first embodiment is that in the puncture needle provided in the present embodiment, the isolation protection part 200 further includes a storage tube 204, such as Figure 4-Figure 7 As shown, the storage tube 204 is arranged on the outside of the first connecting end 104, and one end of the storage tube 204 is fixed to the first connecting end 104, and the other end of the storage tube 204 is provided with a first connecting portion 205, and one end of the flexible protective cover 202 is provided with a second connecting portion 206 adapted to the first connecting portion 205, and one end of the flexible protective cover 202 is detachably fixed to the storage tube 204 through the cooperation between the second connecting portion 206 and the first connecting portion 205, and the flexible protective cover 202 is folded and / or stored between the storage tube 204 and the outer wall of the first connecting end 104. In this embodiment, by providing a storage tube 204, the flexible protective cover 202 can be conveniently folded and / or stored inside the storage tube 204, so that the flexible protective cover 202 can stably maintain a minimum volume state, and one end of the flexible protective cover 202 can be detachably fixed to the storage tube 204 through the cooperation of the second connection part 206 and the first connection part 205, which can not only achieve the fixation of the flexible protective cover 202 and prevent the flexible protective cover 202 from falling off, but also because the second connection part 206 will cooperate with the first connection part 205 at the end of the storage tube 204, it can have a certain blocking effect on the flexible protective cover 202, and can prevent the flexible protective cover 202 from falling out of the storage tube 204.

[0059] To facilitate the arrangement of the second connection portion 206, in a further embodiment, a first terminal 201 is further included. Figure 4-Figure 7 As shown, the first end 201 is a ring-shaped structure, one end of the flexible protective cover 202 is connected to the first end 201, and the second connecting portion 206 is arranged on the first end 201; so that the first end 201 can be detachably fixed to the storage tube 204 through the cooperation of the second connecting portion 206 and the first connecting portion 205.

[0060] The first connection portion 205 and the second connection portion 206 have various embodiments. As a preferred embodiment, the second connection portion 206 is an external thread provided on the first end 201, and the first connection portion 205 is an internal thread provided on the storage tube 204. Figure 4-Figure 7 As shown, the external thread is matched with the internal thread to achieve a detachable connection;

[0061] As another preferred embodiment, the second connecting portion 206 is an internal thread arranged on the first end 201, and the first connecting portion 205 is an external thread arranged on the storage tube 204, and the internal thread is adapted to the external thread; through the cooperation of the internal thread and the external thread, a detachable threaded connection can be achieved so as to achieve a detachable connection; the number of turns of the internal thread and the external thread can preferably be 1-2 turns.

[0062] As a preferred embodiment, the other end of the flexible protective cover 202 may be connected to the storage tube 204, so that when the puncture needle is separated, the flexible protective cover 202 can be separated from the puncture needle by external force.

[0063] As another preferred embodiment, it also includes a second terminal 203, and the second terminal 203 is a ring structure, such as Figure 4-Figure 7 As shown, the second end head 203 is sleeved between the storage tube 204 and the outer wall of the first connecting end 104, that is, the outer diameter of the second end head 203 is less than or equal to the inner diameter of the storage tube 204, and the inner diameter of the second end head 203 is greater than the outer diameter of the first connecting end 104;

[0064] The other end of the flexible protective cover 202 is connected to the second end 203; by providing the second end 203 at the other end of the flexible protective cover 202, the other end of the flexible protective cover 202 has a certain weight and a relatively regular shape, so that during the assembly process, the second end 203 can be conveniently inserted into the storage tube 204, thereby making it easier to fold and / or store the flexible protective cover 202 into the storage tube 204. In addition, by providing the second end 203, there is no need to connect the flexible protective cover 202 to the first connecting end 104 or the storage tube 204. In actual use, as the first end 201 of the flexible protective cover 202 gradually moves away from the storage tube 204, the flexible protective cover 202 can gradually unfold and detach from the storage tube 204. Finally, under the action of appropriate external force, the second end 203 at the other end of the flexible protective cover 202 can be driven to smoothly detach from the storage tube 204, thereby smoothly completing the unfolding function of the entire flexible protective cover 202.

[0065] To prevent the second end 203 from automatically detaching from the storage tube 204, in a further solution, the inner diameter of the first end 201 is smaller than the outer diameter of the second end 203. Figure 5 As shown, the first end 201 can block the second end 203 inside, thereby effectively preventing the second end 203 from automatically detaching from the storage tube 204.

[0066] Preferably, the first end 201 and / or the second end 203 can be made of rubber or plastic so as to have a certain flexibility and elasticity. In particular, when the second end 203 has a certain elasticity, it can be stuck in the storage tube 204 through elastic deformation, so that when the puncture needle is withdrawn, the flexible protective cover 202 can be synchronously moved and fully unfolded under the drive of the puncture needle. After the flexible protective cover 202 is fully unfolded, under the continued action of external force, the second end 203 can be conveniently separated from the puncture needle without causing any damage.

[0067] In addition, due to the arrangement of the first end 201 and the second end 203, and because the first end 201 and the second end 203 have a certain weight, when the flexible protective cover 202 is fully unfolded, the first end 201 and the second end 203 can be respectively placed flat on a support (such as a bed sheet, a surgical cover, etc.) under the action of their own gravity, thereby achieving the purpose of automatically closing the two ends of the flexible protective cover 202, which is more conducive to preventing blood from splashing and can effectively avoid the formation of aerosols in the air.

[0068] Example 3

[0069] This embodiment provides a central venous catheter, including a guidewire, a catheter compatible with the guidewire, and the puncture needle described in Example 1 or Example 2, and the puncture needle is compatible with the guidewire; medical staff can use the guidewire, catheter and puncture needle in combination with existing central venous catheterization operation steps to perform catheterization operations.

[0070] In order to make the catheter and the puncture needle compatible with the guide wire, it can be understood that the outer diameter of the guide wire is smaller than the inner diameter of the needle tube, the inner diameter of the flow channel and the inner diameter of the third connecting end 106, and the outer diameter of the guide wire is smaller than the inner diameter of the catheter.

[0071] Example 4

[0072] According to the central venous catheter provided in Example 3, this embodiment provides a central venous puncture method that can prevent blood from splashing, including the central venous catheter in Example 3, and the method includes the following steps:

[0073] Step 1: determine the puncture point, and puncture the needle tip of the puncture needle into the target blood vessel through the puncture point; during this process, the flexible protective cover 202 is in a compressed and / or folded state, and the puncture operation can be the same as the existing operation. After the puncture is completed, there is usually a certain distance between the needle seat and the skin at the puncture point;

[0074] Step 2: insert one end of the guide wire into the target blood vessel through the puncture needle. Specifically, insert one end of the guide wire into the third connecting end 106, and insert the guide wire into the target blood vessel through the flow channel and the needle tube 101. During this process, the flexible protective cover 202 is in a compressed and / or folded state.

[0075] Step 3, manually pull open the flexible protective cover 202 so that the flexible protective cover 202 is unfolded along the length direction of the needle tube and covers the needle tube 101 between the puncture point and the needle seat 103, and the end of the flexible protective cover 202 away from the needle seat can be unfolded to the position of the puncture point (to facilitate subsequent operations, the end can be temporarily adhered to the puncture point or near the puncture point with medical tape). At this time, one end of the guide wire is located in the target blood vessel, and the other end is located outside the third connecting end 106 of the puncture needle.

[0076] Step 4, withdraw the puncture needle and keep the position of the guide wire unchanged. The specific method is: pull out the puncture needle from the outside of the guide wire. During this process, the needle seat 103 moves in the direction away from the puncture point, and drives the flexible protective cover 202 to continue to unfold, and covers the guide wire inside the flexible protective cover 202, so that the blood adhering to the outer surface of the guide wire of the needle tube 101 during the process of detaching from the guide wire is covered by the flexible protective cover 202 inside, which can not only facilitate the withdrawal of the puncture needle, but also achieve the purpose of isolating and protecting the guide wire during the withdrawal of the needle, thereby effectively preventing the blood on the outer surface of the guide wire from splashing or causing pollution; when the flexible protective cover 202 is fully unfolded, under the action of tension, the flexible protective cover 202 can be detached from the needle seat 103, so that the flexible protective cover 202 can be separated from the puncture needle, and the separated flexible protective cover 202 can completely cover the guide wire left outside the body;

[0077] Step 5: In the flexible protective sleeve 202, one end of the catheter is placed on the guide wire, and the guide wire is used to guide the catheter so that one end of the catheter is inserted into the predetermined position of the target blood vessel along the guide wire. In this process, the catheter and the guide wire cooperate with each other in the flexible protective sleeve 202; preferably, the length of the catheter left outside the body is shorter than the length of the guide wire left outside the body, and the length of the guide wire left outside the body is shorter than the length of the flexible protective sleeve 202, which can not only cover the guide wire and the catheter inside, but also facilitate the subsequent extraction of the guide wire in the catheter;

[0078] Step 6: In the flexible protective cover 202, the guide wire is extracted from the inside of the catheter and stored in the guide wire protection tube. In this process, after the guide wire withdrawn from the target blood vessel is separated from the catheter, it can be stored in the guide wire protection tube inside the flexible protective cover 202 to complete the recovery of the guide wire. That is, during the entire process of recovering the guide wire, the guide wire is inside the flexible protective cover 202 and will not be directly exposed to the air, which will not only not contaminate nearby surgical instruments, such as surgical covers, bed sheets, etc., but also will not cause blood splashing and can effectively avoid the formation of aerosols in the air.

[0079] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A central venous puncture needle, It is characterized in that The needle holder comprises a needle tube and a needle seat, wherein the needle seat comprises a first connecting end, a second connecting end and a third connecting end, wherein the first connecting end, the second connecting end and the third connecting end are connected through a flow channel arranged in the needle seat, one end of the needle tube is fixed to the first connecting end and connected to the flow channel, and the other end of the needle tube is configured with a needle tip; the first connecting end is provided with an isolation protection part, wherein the isolation protection part comprises a flexible protective cover, and the flexible protective cover is compressed and / or folded on the first connecting end, and is used to unfold along the length direction of the needle tube and cover at least a part of the guide wire during the process of catheterization; The isolation protection part also includes a storage tube, which is arranged on the outer side of the first connecting end, and one end of the storage tube is fixed to the first connecting end, and the other end of the storage tube is provided with a first connecting part, and one end of the flexible protective sleeve is provided with a second connecting part adapted to the first connecting part, and one end of the flexible protective sleeve is detachably fixed to the storage tube through the cooperation of the second connecting part and the first connecting part, and the flexible protective sleeve is folded and / or stored between the outer wall of the storage tube and the first connecting end; and also includes a first end head, the first end head is an annular structure, one end of the flexible protective sleeve is connected to the first end head, and the second connecting part is provided Placed on the first end, the second connecting part is an external thread set on the first end, the first connecting part is an internal thread set on the storage tube, and the external thread is adapted to the internal thread, or, the second connecting part is an internal thread set on the first end, the first connecting part is an external thread set on the storage tube, and the internal thread is adapted to the external thread; the other end of the flexible protective cover is connected to the storage tube, or, it also includes a second end, the second end is an annular structure, the second end is set between the storage tube and the outer wall of the first connecting end, and the other end of the flexible protective cover is connected to the second end.

2. The central venous puncture needle according to claim 1, It is characterized in that The flexible protective cover is a plastic film with a cylindrical structure.

3. The central venous puncture needle according to claim 2, It is characterized in that One end of the flexible protective sleeve is fixed to the first connecting end.

4. The central venous puncture needle according to claim 3, It is characterized in that The inner diameter of the first end head is smaller than the outer diameter of the second end head, and the first end head and / or the second end head are made of rubber or plastic.

5. A central venous catheter, It is characterized in that It comprises a guide wire, a catheter and the puncture needle according to any one of claims 1 to 4.

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