CN113080957B - A kind of positive pressure sealing pipe joint and blood collection indwelling needle - Google Patents

Abstract

The utility model provides a malleation tube sealing joint, relates to medical equipment technical field, and this malleation tube sealing joint includes first casing, be equipped with in the first casing and hold chamber and stock solution chamber, hold the chamber with be equipped with the tube sealing liquid valve on the pore of intercommunication between the stock solution chamber. The positive pressure tube sealing joint can quickly and conveniently inject tube sealing liquid into the extension tube to enable blood in the extension tube to flow back, so that automatic positive pressure tube sealing is realized, and the working efficiency is improved.

Description

A kind of positive pressure sealing tube joint and blood collection indwelling needle

technical field

The invention relates to the technical field of medical equipment, in particular to a positive pressure sealing tube joint and a blood collection indwelling needle.

Background technique

The intravenous indwelling needle is also called the intravenous trocar. The components of the core include a flexible catheter/cannula that can be indwelled in the blood vessel, and a stainless steel puncture guide core. When in use, the catheter and the needle core are punctured into the blood vessel together. After the catheter has completely entered the blood vessel, the needle core is withdrawn, and only the soft catheter is left in the blood vessel for infusion therapy. The use of indwelling needles can reduce the pain and fear of injections caused by repeated venipuncture in children, relieve the anxiety of parents, facilitate clinical medication, rescue medication for acute and critical patients, reduce the workload of nurses, and reduce the risk of children's anxiety. Pain, so intravenous indwelling needles are widely used clinically.

Venous blood collection is a common nursing operation in clinical nursing work, and it is also one of the main techniques to assist doctors in diagnosing and treating diseases. At present, most hospitals use disposable blood collection needles when collecting blood, and discard them immediately after blood collection. The workload of medical staff.

The function of blood collection on the venous indwelling needle can reduce the number of punctures to the patient, thereby reducing the pain of the patient and improving work efficiency. However, after the blood collection is completed with the venous indwelling needle, there is blood in the extension tube and the connector. If there is no time interval between the infusion and the subsequent infusion, the blood in the extension tube can be flushed back with the infused liquid. If the infusion cannot be done immediately after blood collection, positive pressure sealing is required, otherwise, the blood will coagulate in the extension tube and block the extension tube. In severe cases, flushing the coagulated blood back into the patient's body will cause thrombus and cause medical malpractice. The traditional positive pressure tube sealing method needs to disassemble the joint, and the nursing staff manually injects the tube sealing solution, which has low work efficiency.

Therefore, it is necessary to design a positive pressure sealing joint, which can quickly and conveniently inject sealing liquid into the extension tube, so that the blood in the extension tube can flow back.

Contents of the invention

Aiming at the above technical problems in the prior art, the present invention provides a positive pressure sealing tube joint, which can quickly and conveniently inject tube sealing liquid into the extension tube, so as to make the blood in the extension tube flow back and improve work efficiency.

In order to achieve the above technical purpose, the present invention provides a positive pressure pipe sealing joint, which includes a first housing, and the first housing is provided with an accommodation chamber and a liquid storage chamber, and the accommodation chamber and the liquid storage chamber communicate with each other. There is a lock liquid valve on the channel.

Further, a plug body is provided in the liquid storage chamber, and the plug body is slidably and sealedly connected with the liquid storage chamber, and a sealed tube is stored in the cavity between the plug body and the locking fluid valve. liquid.

Further, it also includes a liquid storage spring, one end of the liquid storage spring is in contact with the plug body, and the other end is in contact with the first housing; when the locking fluid valve is opened, the liquid storage spring uses To provide the elastic force for injecting the locking fluid into the containing cavity.

Further, the first casing is also provided with a breathing hole, one end of the breathing hole communicates with the cavity where the liquid storage spring is located, and the other end extends to communicate with the outside air.

Further, the lock fluid valve is used to open or close the tunnel.

Further, the casing fluid valve includes a valve body that is threadedly connected with the first housing, and a sealing cone capable of blocking the hole is provided at the front end of the valve body.

Further, the first casing is further provided with a liquid replenishment hole, one end of the liquid replenishment hole communicates with the liquid storage chamber, and the other end extends to the outside of the first casing.

Further, the liquid replenishment hole is provided with a one-way valve, and the one-way valve is used to restrict the one-way flow of the locking liquid in the liquid replenishment hole from the outer opening of the liquid replenishment hole to the liquid storage chamber.

Further, the outer opening of the liquid replenishment hole is provided with a sealing rubber plug.

Further, the lock fluid is physiological saline.

Further, the channel includes a first inner hole and a second inner hole, the first inner hole communicates with the liquid storage chamber, and the second inner hole communicates with the accommodation chamber.

Further, a spiral groove is provided on the inner wall of the second inner hole.

Further, in the direction from the liquid storage chamber to the flow hole, the diameter of the second inner hole gradually decreases, and the gradual reduction of the diameter of the second inner hole can further improve the lock liquid entering the annular groove.

The application also discloses a blood collection indwelling needle adopting the above-mentioned positive pressure sealing tube joint,

An indwelling needle for blood collection, comprising a needle body part, a blood collection part and the above-mentioned positive pressure sealing tube joint connected in sequence, the needle body part is used for puncturing into human blood vessels, and the needle body part includes an indwelling joint and an extension tube connected with the indwelling joint , the indwelling joint is connected with the positive pressure seal joint. The positive pressure sealing tube joint has a closed state and an open state. When injecting medicine into the human body or collecting blood, the positive pressure sealing tube joint is in an open state; when the blood collection part or infusion tube is separated from the positive pressure sealing tube joint, the positive pressure sealing tube joint The connector is in a closed state to prevent medicine or blood from flowing out. The blood collection unit and the infusion tube are detachably connected to the positive pressure sealing tube joint. When the blood collection unit is connected to the positive pressure sealing tube joint, the positive pressure sealing tube joint is in an open state, and the blood collection unit and When the positive pressure sealing pipe joint is separated, the positive pressure sealing pipe joint is in a closed state.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

The positive pressure sealing tube joint of the present invention can quickly and conveniently inject tube sealing liquid into the extension tube, so as to make the blood in the extension tube flow back and improve the working efficiency. When in use, when the lock liquid valve is opened, when the plug body moves downward, the plug body can squeeze the lock liquid into the accommodation chamber, thereby allowing the blood in the positive pressure seal joint and the extension tube to flow back, preventing blood condensation. The sealing liquid valve is used to open or close the channel, the opening of the sealing liquid valve can be adjusted, and the flow rate of the sealing liquid entering the accommodation cavity can also be adjusted as required;

In one embodiment of the present invention, by setting a helical groove in the second inner hole, when the tube locking liquid is injected, the tube locking liquid enters the annular groove and the through hole in a certain direction, which is beneficial to the sealing of the tube and the through hole. Push the blood, thereby reducing the elasticity requirements of the liquid storage spring in this application. On the other hand, in the solution of this application, there are steps and some sharp corners on the flow path of the annular groove and the through hole. It is difficult for the blood to be pushed back into the body of the blood sampler by the locking fluid, and the blood remains on the edge of the step and some sharp corners. After a long time, the blood loses its activity, or even lesions occur, leading to major medical accidents. In this application In the scheme, the tube lock solution enters in a certain direction, which is more conducive to flushing the above-mentioned step edges and sharp corners, reducing the risk of blood residue in these positions; If the in vitro residence time is too long, there will be qualitative changes. Therefore, the solution of the present application can also greatly reduce the risk of qualitative changes of the drug residues in vitro after the tube is sealed.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of an indwelling needle for blood collection;

Fig. 2 is a schematic structural view of the positive pressure sealing tube joint in the blood collection indwelling needle of an embodiment;

Fig. 3 is a schematic structural view of the blood collection part in the blood collection indwelling needle of an embodiment;

Fig. 4 is a schematic diagram of the assembly structure of the positive pressure sealing tube joint and the blood collection part in the blood collection indwelling needle of an embodiment;

Fig. 5 is a schematic structural view of another embodiment of a blood collection indwelling needle;

Fig. 6 is a schematic structural view of a positive pressure sealing pipe joint according to an embodiment of the present invention;

Fig. 7 is a partial enlarged view of place A in Fig. 6;

Figure 8 is a partial enlarged view of the sealing bead;

Fig. 9 is a partial enlarged view of the second inner hole when the second inner hole is provided with a spiral groove,

Explanation of reference signs

1-needle body, 101-indwelling joint, 102-extension tube;

2-positive pressure sealing pipe joint, 201-first housing, 202-piston, 203-return spring, 204-connecting pipe, 205-first sealing ring, 206-second sealing ring, 207-third sealing ring, 208-annular groove, 209-circulation hole, 210-tapered protrusion, 211-seal inner hole, 212-seal body, 213-plug body, 214-accommodating chamber, 215-storage chamber, 216-plug body, 217- Storage spring, 218-first inner hole, 219-second inner hole, 220-sealing liquid valve, 221-sealing cone, 222-sealing section, 223-thread section, 224-handle, 225-fourth seal Ring, 226-threaded hole, 227-hydration hole, 228-sealing bead, 229-sealing spring, 230-sealing rubber plug, 231-breathing hole, 232-spiral groove;

3-blood collection part, 301-second housing, 302-inner protrusion, 303-tapered groove, 304-drainage hole, 305-flow hole, 306-blood collection needle, 307-protective cover.

Detailed ways

Other objects and advantages of the present invention will become clear by explaining the following preferred embodiments of the present application.

Example 1

As shown in Figure 1, a blood collection indwelling needle includes a needle body part 1 connected in sequence, a positive pressure sealing tube joint 2 and a blood collection part 3, the needle body part 1 is used to puncture into a human vein, and the needle body part 1 includes The indwelling joint 101 and the extension tube 102 connected with the indwelling joint 101 are used for connecting with the positive pressure sealing tube joint 2 . The positive pressure sealing tube joint 2 has a closed state and an open state. When injecting medicine into the human body or taking blood, the positive pressure sealing tube joint 2 is in an open state; when the blood collection part 3 or the infusion tube is separated from the positive pressure sealing tube joint 2, The positive pressure seal tube joint 2 is in a closed state to prevent medicine or blood from flowing out. In order to achieve the above functions, the blood collection part 3 is detachably connected to the positive pressure sealing tube joint 2, and when the blood collection part 3 is connected to the positive pressure sealing tube joint 2, the positive pressure sealing tube joint 2 is opened. state, when the blood collection part 3 is separated from the positive pressure sealing tube joint 2, the positive pressure sealing tube joint 2 is in a closed state.

The blood collection indwelling needle of the present invention is simple and quick to operate, and is suitable for patients who need blood collection and infusion (provided that the patient does not take any blood samples before undergoing any drug treatment). The blood collection indwelling needle of the present invention can achieve a win-win situation for nurses and patients. For patients, the number of punctures is reduced, which not only protects patients but also relieves pain; for nurses, it can reduce workload and improve work efficiency.

As shown in Figure 2, the positive pressure sealing joint 2 includes a first housing 201, a piston 202 and a return spring 203, and the piston 202 and the return spring 203 are located inside the first housing 201; One end of the return spring 203 abuts against the piston 202 , and the other end abuts against the first casing 201 . When blood collection is required, the blood collection part 3 is connected to the positive pressure sealing tube joint 2, the blood collection part 3 squeezes the piston 202, and further compresses the return spring 203, and the positive pressure sealing tube joint 2 is adjusted from a closed state to an open state; when the blood collection part 3 After being separated from the positive pressure sealing pipe joint 2, the return spring 203 pushes the piston 202 to adjust the positive pressure sealing pipe joint 2 from an open state to a closed state.

The piston 202 is composed of a plug-shaped body 213 with a larger diameter and a sealing body 212 with a smaller diameter. The plug-shaped body 213 and the sealing body 212 are coaxially arranged. The piston 202 is slidable along the axial direction of the housing. The piston 202 is provided with a flow hole 209 , the flow hole 209 extends from the end face of the plug-shaped body 213 to the side of the sealing body 212 , and radially extends to the outer contour of the sealing body 212 at the sealing body 212 . A first sealing ring 205 is provided on the outer circle of the plug-shaped body 213 away from the sealing body 212 , and a second sealing ring 206 is provided at the inner hole. A third sealing ring 207 is disposed on the outer circumference of the sealing body 212 away from the plug-shaped body 213 . Wherein, the first sealing ring 205 of the plug-shaped body 213 is used to form a sealing connection with the inner hole of the first housing 201 . The second sealing ring 206 of the plug-shaped body 213 is used to form a sealing connection with a connecting pipe 204 . One end of the connecting tube 204 is fixedly and sealingly connected to the end of the first housing 201 connected to the needle body 1 , and the other end of the connecting tube 204 is slidably and sealingly connected to the plug-shaped body 213 . Thus, when the piston 202 axially slides along the first housing 201 , the connection tube 204 and the flow hole 209 of the piston 202 can maintain a sealed connection, preventing blood or medicinal liquid from entering the cavity where the return spring 203 is located.

The first housing 201 is provided with an annular groove 208 and a sealing inner hole 211, the inner diameter of the annular groove 208 is larger than the inner diameter of the sealing inner hole 211, and the annular groove 208 is coaxial with the sealing inner hole 211 hearts set. When the piston 202 moves to the position shown in Figure 2, the port of the flow hole 209 located on the outer circle of the sealing body 212 corresponds to the annular groove 208, and the third sealing ring 207 of the sealing body 212 forms a sealing connection with the sealing inner hole 211, and the positive pressure seal The pipe joint 2 is in a closed state.

Let’s take the blood collection part 3 as an example for illustration. When the piston 202 is squeezed by the blood collection part 3, it moves upwards. When the third sealing ring 207 moves to the position of the annular groove 208, the third sealing ring 207 loses its function, and the positive pressure seals the tube. Connector 2 is open. When the blood collection part 3 is separated from the positive pressure sealing tube joint 2, the return spring 203 pushes the piston 202 to move downward. The liquid can flow to the extension tube 102 through the flow hole 209 , preventing the patient's blood from flowing into the extension tube 102 again.

After the nursing staff takes blood, the positive pressure sealing tube joint 2 can be automatically closed; during infusion, after the nursing staff disinfects, they can directly connect the filter end of the infusion set to the positive pressure sealing tube joint 2, and the blood can be returned through the infusion without using a syringe Inject normal saline for flushing to reduce waste of consumables. After the infusion is completed, the nursing staff can inject physiological saline into the positive pressure sealing tube joint 2, and push the medicinal liquid in the extension tube 102 into the human body to realize the positive pressure sealing tube.

As shown in FIG. 3 , the blood collection unit 3 includes a second housing 301 with an internal protrusion 302 inside, and the second housing 301 is detachably connected to the first housing 201 , when the second housing 301 is connected with the first housing 201 , the front end of the inner protrusion 302 can be abutted against the piston 202 , can press against the end of the piston 202 , and compress the return spring 203 .

The end of the piston 202 facing the second housing 301 is provided with a tapered protrusion 210 (refer to FIG. 2 ); Shaped groove 303. The above-mentioned tapered groove 303 can be automatically connected with the tapered protrusion 210 and realize the alignment of the central axes of the two.

The blood collection part 3 also includes a blood collection needle 306, which is arranged on the opposite side of the inner protrusion 302, and the inner protrusion 302 is provided with a through hole 305 communicating with the blood collection needle 306, the The inner protrusion 302 is further provided with a plurality of drainage holes 304 connected with the through hole 305 and penetrating through the wall of the inner protrusion 302 . This structure makes the inner protrusion 302 have greater strength and prevents the inner protrusion 302 from bending. The outer cover of the blood collection needle 306 is provided with a protective cover 307, the protective cover 307 is detachably connected with the second housing 301, the protective cover 307 can protect and isolate the blood collection needle 306, and avoid contamination of the blood collection needle 306 and blood samples.

In addition, the shape of the end of the needle body 1 connected to the positive pressure sealing joint 2 can be set to be compatible with the heparin cap, or the positive pressure sealing joint 2 can be connected to the The shape of the connecting end of the blood collection part 3 is set to fit with the heparin cap. Therefore, the indwelling joint 101 or the positive pressure sealing tube joint 2 of the blood collection indwelling needle can be sealed with a heparin cap. The heparin cap is matched with the blood collection indwelling needle, and heparin sodium is injected into it to prevent blood backflow and anticoagulation.

Example 2

This embodiment is further improved on the basis of Embodiment 1. Specifically, in this embodiment, a liquid storage chamber 215 is also provided on the positive pressure sealing pipe joint 2, and the sealed liquid can be stored in the liquid storage chamber 215. As for the tube fluid, when necessary, the tube lock solution in the liquid storage chamber 215 is used to seal the tube.

Specifically, as shown in Fig. 5 and Fig. 6, a positive pressure sealing pipe joint 2 includes a first housing 201, and the first housing 201 is provided with an accommodating chamber 214 and a liquid storage chamber 215, and the accommodating chamber 214 and the storage chamber A pipe lock liquid valve 220 is provided on the channel communicating between the liquid chambers 215 . There are various options for the structure of the above-mentioned lock liquid valve 220, as long as the hole can be opened/closed.

The liquid storage chamber 215 is provided with a plug body 216 , the plug body 216 and the liquid storage chamber 215 are slidably and hermetically connected, and the outer contour of the plug body 216 is provided with a sealing ring. Locking fluid is stored in a cavity between the plug body 216 and the locking fluid valve 220 . The lock fluid can be physiological saline. When the locking fluid valve 220 is opened, when the plug body 216 moves downward, the plug body 216 can squeeze the locking fluid into the accommodating chamber 214, thereby allowing positive pressure to seal the blood in the sealing joint 2 and the extension tube 102. Reflux to avoid blood clotting.

In order to drive the above-mentioned plug body 216 to move, it can be pushed by hand or by other methods. In this embodiment, the elastic force of the spring is preferably used to push the locking fluid into the accommodation cavity 214 . Specifically, the positive pressure sealing pipe joint 2 of this embodiment further includes a liquid storage spring 217 , one end of the liquid storage spring 217 abuts against the plug body 216 , and the other end abuts against the first housing 201 . When the locking fluid valve 220 is opened, the liquid storage spring 217 is used to provide an elastic force for injecting the locking fluid into the accommodating cavity 214 .

In this embodiment, the first housing 201 is further provided with a breathing hole 231 , one end of the breathing hole 231 communicates with the cavity where the liquid storage spring 217 is located, and the other end of the breathing hole 231 extends to communicate with the outside air. Therefore, it is possible to avoid forming a closed space in the cavity on the side of the liquid storage spring 217 and affecting the movement of the plug body 216 .

As shown in FIG. 7 , the lock fluid valve 220 is used to open or close the tunnel. The aforementioned hole includes a first inner hole 218 and a second inner hole 219 , the first inner hole 218 communicates with the liquid storage chamber 215 , and the second inner hole 219 communicates with the accommodation chamber 214 . The casing liquid valve 220 includes a valve body screwed to the first housing 201 , and a sealing cone 221 capable of blocking the channel is provided at the front end of the valve body. The sealing cone 221 can form a sealing connection with the opening of the second inner bore 219 . On the right side of the sealing cone 221 , the valve body is provided with a sealing section 222 , a threaded section 223 and a handle 224 in sequence. The sealing section 222 cooperates with the fourth sealing ring 225 installed on the first housing 201 to achieve sealing. The threaded section 223 is threadedly connected to the threaded hole 226 provided on the first housing 201, the handle 224 is located outside the first housing 201, when the handle 224 is turned, the sealing liquid valve 220 can be opened/closed , the opening of the lock liquid valve 220 can also be adjusted, thereby adjusting the flow rate of the lock liquid into the accommodation chamber 214 .

In a further preferred solution, as shown in FIG. 9 , a spiral groove 232 is provided on the inner wall of the second inner hole 219 . In actual use, the blood viscosity of some patients is high, and it is difficult to draw blood, and after the blood drawing is completed, when the tube is sealed, it is difficult for the tube lock solution to be injected into the tube lock joint, so , in the solution of this embodiment, by setting the spiral groove 232 on the inner wall of the second inner hole 219, when the locking liquid is injected, the locking liquid enters the annular groove 208 and the through hole 209 in a certain direction, which is beneficial to The sealed tube also pushes the blood, thereby reducing the elasticity requirements of the liquid storage spring 217 in this application. The blood at these positions is difficult to be pushed back into the body of the blood-collected person by the tube lock fluid, and blood remains on the edge of the step and some sharp corners. After a long time, the blood loses its activity, or even lesions occur, which will lead to serious problems. Medical malpractice, in the solution of this application, the tube lock solution enters in a certain direction, which is more conducive to flushing the above-mentioned step edges and sharp corners, reducing the risk of blood residue in these positions; and when the tube lock is performed after the infusion , Some medicinal liquids stay in vitro for too long, and there will be qualitative changes. Therefore, the solution of the present application can also greatly reduce the risk of qualitative changes of medicinal residues in vitro after sealing the tube.

In a further preferred solution, as shown in FIG. 9 , in the direction from the liquid storage chamber 215 to the flow hole 209 , the diameter of the second inner hole 219 decreases gradually. The gradual reduction of the pore diameter of the second inner hole 219 can further increase the flow rate of the locking liquid entering the annular groove 208 and the through hole 209, further facilitates the flushing of the edge of the step and the sharp corner of the flow channel by the locking liquid, and further reduces the The residual risk of blood or liquid medicine outside the body.

When it needs to be explained, since there is less blood in the positive pressure sealing tube joint 2 and the extension tube 102, the volume of the liquid storage chamber 215 is correspondingly smaller, which can meet the requirements of one operation. Therefore, the sealing solution can be injected into the liquid storage chamber 215 when the positive pressure sealing joint is manufactured.

In addition, in order to be able to reuse the positive pressure sealing pipe joint 2, the lower end of the first housing 201 is also provided with a liquid replenishment hole 227, one end of the liquid replenishment hole 227 communicates with the liquid storage chamber 215, and the other end extends to the first shell body 201 outside. After the lock solution in the liquid storage chamber 215 is used up, the lock solution can be replenished into the liquid storage chamber 215 through the liquid replenishment hole 227 for the next use.

Specifically, as shown in FIG. 8 , the liquid replenishment hole 227 is provided with a one-way valve, which is used to limit the one-way flow of the locking fluid in the liquid replenishment hole 227 from the outer opening of the liquid replenishment hole 227 to the liquid storage chamber 215 . The one-way valve includes a sealing bead 228 and a sealing spring 229 , and the sealing spring 229 is used to provide an elastic force to push the sealing bead 228 against the inner port of the liquid replenishing hole 227 . A sealing rubber plug 230 is provided at the outer opening of the fluid replenishing hole 227 , and a syringe can be used to inject locking fluid through the sealing rubber plug 230 into the fluid replenishing hole 227 .

The device of the present application has been described in detail with reference to the preferred technical solutions of the present application. However, it should be noted that, without departing from the spirit of the present application, those skilled in the art can make any modifications, Modifications and changes. This application includes the specific embodiments described above and any equivalents thereof.

Claims (8)

1. A positive pressure pipe sealing joint is characterized by comprising a first shell, wherein a containing cavity and a liquid storage cavity are arranged in the first shell, and a pipe sealing liquid valve is arranged on a pore channel communicated between the containing cavity and the liquid storage cavity; a plug body is arranged in the liquid storage cavity, the plug body is connected with the liquid storage cavity in a sliding and sealing manner, and a tube sealing liquid is stored in a cavity between the plug body and the tube sealing liquid valve; the pore includes first hole and second hole, first hole and stock solution chamber intercommunication, the second hole with hold the chamber intercommunication, be provided with spiral groove on the inner wall of second hole, by stock solution chamber to opening in the direction of hole, the aperture of second hole reduces gradually, the reduction gradually in second hole aperture, the velocity of flow that can further improvement tube sealing liquid got into annular groove and through-hole.

2. The positive pressure pipe sealing joint according to claim 1, further comprising a liquid storage spring, wherein one end of the liquid storage spring abuts against the plug body, and the other end of the liquid storage spring abuts against the first housing; when the tube sealing liquid valve is opened, the liquid storage spring is used for providing elastic force for injecting the tube sealing liquid into the accommodating cavity.

3. The positive pressure seal pipe joint according to claim 2, wherein a breathing hole is further formed in the first shell, one end of the breathing hole is communicated with the cavity where the liquid storage spring is located, and the other end of the breathing hole extends to be communicated with outside air.

4. The positive pressure pipe sealing joint according to claim 1, wherein the pipe sealing liquid valve is used for opening or closing the hole.

5. The positive pressure pipe sealing joint according to claim 4, wherein the pipe sealing liquid valve comprises a valve body in threaded connection with the first housing, and a sealing taper portion capable of blocking the hole passage is provided at a front end of the valve body.

6. The positive pressure pipe sealing joint according to claim 1, wherein the first housing further comprises a fluid infusion hole, one end of the fluid infusion hole is communicated with the fluid storage cavity, the other end of the fluid infusion hole extends to the outside of the first housing, a check valve is arranged on the fluid infusion hole, and the check valve is used for limiting one-way flow of the pipe sealing fluid in the fluid infusion hole from an outer orifice of the fluid infusion hole to the fluid storage cavity.

7. The positive pressure sealing pipe joint according to claim 6, wherein the outer orifice of the fluid infusion hole is provided with a sealing rubber plug.

8. A blood sampling indwelling needle is characterized by comprising a needle body part, a blood sampling part and the positive pressure tube sealing joint of any one of claims 1 to 7 which are connected in sequence, wherein the needle body part is used for puncturing a blood vessel of a human body, the needle body part comprises an indwelling joint and an extension tube connected with the indwelling joint, the indwelling joint is connected with the positive pressure tube sealing joint, the positive pressure tube sealing joint has a closed state and an open state, and when a medicament is injected into the human body or blood sampling is carried out, the positive pressure tube sealing joint is in the open state; when blood sampling portion or transfer line and malleation seal the union coupling separation, malleation seal the union coupling and be the encapsulated situation, avoid medicine or blood to flow out, blood sampling portion and transfer line with malleation seal the union coupling and can dismantle the connection.

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