CN113616877A - Indwelling needle assembly with valve - Google Patents

Abstract

The present invention relates to an indwelling needle assembly with a valve comprising at least a first section and a second section which are movable relative to each other. The first section has a first member disposed therein. The second section is internally provided with a second component capable of independent sealing. When the first and second segments are brought close to each other based on an external force, the first and second components are brought close to each other and finally communicate to deliver the medical fluid in the first connector to the patient. The invention has the advantages of simple operation, convenient use, high safety and long service life.

Description

Indwelling needle assembly with valve

Technical Field

The invention relates to the technical field of medical instruments, in particular to an indwelling needle assembly with a valve.

Background

The venous indwelling needle can avoid repeated puncture when in use, reduces the workload of nurses and the pain of patients, and is convenient for the first aid of critical patients. Keep somewhere the needle and need seal the pipe after the use, avoid patient's blood backward flow, also avoid external pollutant to get into patient's blood vessel through keeping somewhere the needle and cause patient's infection. In the use and maintenance process of the existing indwelling needle, the clip provided with only one slice-shaped strip-shaped clip groove or an oval pressing type clip body cannot be completely fixed at the position close to the needle base when in use, even if the clip is clamped at the position nearest to the needle base to the maximum extent, blood return can be generated when a patient exerts force or does not exert force slightly, and the blood return cannot be continuously used after the blood return is solidified in the indwelling needle infusion tube. Therefore, the maintenance of the sealed blood in the pipeline after the transfusion is finished is a crucial step for prolonging the service life of the indwelling needle.

In the prior art, a great deal of improvement is performed on an indwelling needle based on the technical problem, for example, CN108992737A discloses an indwelling needle capable of preventing thrombus and blocking a tube, which comprises a three-way needle base, an indwelling hose arranged at the front end of the three-way needle base and a puncture needle penetrating into the indwelling hose from the rear end of the three-way needle base, wherein a blocking structure is arranged in the three-way needle base; after one-time transfusion is finished, the blocking structure penetrates into the front end of the indwelling hose and blocks an opening at the front end of the indwelling hose; in the infusion process, the plugging structure retracts into the three-way needle seat behind the indwelling hose so as not to block the infusion flow rate. The device controls the plugging structure to extend from the flexible tube of the indwelling needle to the needle tip of the indwelling needle by vibrating at the three-way joint as the distal end so as to plug the flexible tube which detains the indwelling needle in the blood vessel of the user. However, the device is contaminated with blood when extending into the hose end of the user's blood vessel, and the blood is contaminated in other parts of the occlusion assembly by the occlusion assembly after being withdrawn again, and bacteria can grow in the blood residue with the time. Therefore, the using process of the device does not accord with the medical aseptic safety standard, and the hidden trouble is great in the using process.

CN205379514U discloses a slow-release positive pressure device and an indwelling needle thereof, which comprises a spiral joint, a front tee joint, a slow-release conduit, a middle conduit, a small regulator, a rear tee joint and a liquid reservoir, wherein the small regulator is sleeved on the middle conduit, two ends of the slow-release conduit and the middle conduit are respectively connected with two hole ends of the front tee joint and the rear tee joint, other accessories are mutually connected, the slow-release positive pressure device of the indwelling needle is provided with the double conduits, one conduit is the slow-release conduit with a micropore in the middle, the other conduit is the middle conduit with a general aperture, after the middle conduit is clamped by the small regulator, the liquid pressure released by the liquid reservoir forms pressure, and the physiological saline slowly flows out of the micropore of the slow-release conduit to the indwelling needle conduit assembly and then permeates into blood vessels. However, the small regulator of the device is easily touched by mistake in the process of fixing the small regulator on the hand of a user, and after the small regulator is touched by mistake, the physiological saline can quickly enter the blood of a patient through the middle catheter based on the pressure of the liquid storage cavity, so that the slow release effect is lost. Moreover, the small adjuster and the external liquid storage device can increase the volume of the device, and increase the wearing burden of a user and the false touch probability of the device.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

In response to the deficiencies of the prior art, the present invention provides an indwelling needle assembly with a valve, the assembly comprising a first section and a second section that are movable relative to each other. The first section is internally provided with a first part capable of being sealed independently, and the second section is internally provided with a second part capable of being sealed independently. When the first and second segments are brought close to each other based on an external force, the first and second components are brought close to each other and finally communicate to deliver the medical fluid in the first connector to the patient. Preferably, the first section and the second section are slidably connected. Preferably, the first section and the second section are threadedly connected. Preferably, the assembly is disposed on a transparent tee of the indwelling needle.

The following advantages are achieved through the arrangement mode: the first section and the second section are connected in a sliding and sealing mode, the first section and the second section can be communicated or separated through a simple pulling and inserting operation, when the first section and the second section are separated, the first component and the second component are separated from each other and sealed independently, the liquid end and the needle tip end can be separated respectively, blood cannot return to the liquid end from the needle tip and even cannot reach an extension tube through the first connector, and therefore the problem of blood backflow blocking does not occur, when the first section and the second section are communicated with each other, the first component and the second component which are closed independently can be connected with each other and opened with each other, so that the first component and the second component are in liquid communication with each other, and therefore liquid medicine can enter the second component through the first component and then reach the blood of a patient through the needle tip, and the indwelling needle can be used after next transfusion. And the first section and the second section are movably connected with each other, and the first section and the second section can protect the structures and the cleanness of the first component and the second component, so that the medical and health regulations are met when the disposable medical disposable protective toothbrush is used next time.

According to a preferred embodiment, the first part is provided with an injection part for protruding into the interior of the second connector. In case the first and second sections are separated from each other, the injection part is provided with a distally open first one-way valve in an independently sealable manner.

Such an arrangement has the following advantages: the first one-way valve opens towards the distal end, which is remote from the patient, so that medical fluid flowing from the distal end to the proximal end cannot open the first one-way valve, so that an isolation seal can be effected to the first section by the first one-way valve. Therefore, when the first section is separated from the second section, the first part can be automatically sealed through the first one-way valve, and the phenomenon that liquid medicine added inside leaks is avoided, so that the infusion set is convenient to use in next infusion. Meanwhile, microorganisms entering the joint of the first section and the second section can be prevented from entering the first section through the injection part to pollute the liquid medicine.

According to a preferred embodiment, the second part is provided with a first protrusion in such a way that the first one-way valve can be opened in a situation in which the first part and the second part are connected to each other. When the first member is connected to the second member, the first projection can open the first one-way valve on the first member and can allow the liquid in the first member to pass through the injection part into the second member.

According to a preferred embodiment, the second part comprises a housing and a bellows which can expand the inner volume by squeezing or stretching, the bellows outer wall and the housing inner wall constituting a fluid passage when the first part and the second part are connected to each other.

According to a preferred embodiment, the telescopic portion comprises a telescopic section and a flow restriction section which are connected to each other, and when the first member and the second member are separated from each other, the flow restriction section is tightly connected to one end of the housing close to the first member to close the second member.

Such an arrangement has the following advantages: the length of the telescopic section is changed to change the connection condition of the flow limiting section and the shell, so that the existence or nonexistence of a fluid channel formed between the shell and the telescopic part is changed, the telescopic part is matched with the insertion and separation of the first section and the second section, the second part can be rapidly sealed under the condition that the first section and the second section are rapidly separated, other complex operations are not needed, the independent sealing state of the second part and the first part can be kept, and blood is prevented from reaching the first part through the second part and further reaching the extension pipe to block the pipeline. And, the volume of the second part can be reduced to reduce the volume weight and the probability of false touch of the device.

According to a preferred embodiment, the casing is provided with a spacer at one end near the second section, the spacer being connected to one end of the telescopic section near the second section, and the spacer is provided with a first hole for communicating the fluid passage with the interior of the first section at a position corresponding to the fluid passage. To connect the fluid passage with the needle of the indwelling needle to deliver the liquid to the patient.

According to a preferred embodiment, the housing is provided with a seal on its outer side wall close to the first section, which seal enables the first section to be connected to the second section in a sealing manner. Preferably, the seal is a sliding seal.

According to a preferred embodiment, said first section is provided with second holes in such a way as to maintain a balance of the air pressure inside the first section during the movement of said first and second sections with respect to each other, said second holes being provided with a filter membrane in such a way as to keep said first part clean.

The following advantages are achieved by the arrangement mode: sealing the joint of the first section and the second section by sliding a sealing member to prevent the first component and the second component inside the first section and the second section from being polluted by outside air or microorganisms; when the first section and the second section slide relative to each other to reduce or increase the space between the first component and the second component, the second hole can exhaust air to the outside or suck air from the outside to balance the internal air pressure and the external air pressure, so that the relative movement of the first section and the second section is prevented from being influenced by the too low or too high internal air pressure. The filter membrane that sets up on the second hole can filter the microorganism in the gaseous in-process of inhaled gas to avoid external microorganism to enter into this space along with the air, cause the pollution to first part or second part. Preferably, the filter membrane is replaceable.

According to a preferred embodiment, the first and second segments are provided with first and second stop elements that engage with each other so as to be able to remain in a first operating position, in which they are spaced apart from each other, and in a second operating position, in which they are close to each other.

Such an arrangement has the following advantages: the device can improve the false touch prevention performance, the first section and the second section can be respectively kept at the first working position and the second working position through the limiting parts arranged at the first working position and the second working position, and under the condition that the connection between the first limiting part and the second limiting part is not released through operation, the touch of a user in daily life cannot cause the first section and the second section to be changed from the first working position or from the second working position, so that the fixation is more stable, and the false touch prevention effect is better.

An indwelling needle comprising at least a first connector for connecting an elongate tube to a needle, the first connector comprising a first section and a second section which are movable relative to each other, the first section having an independently sealable first part disposed therein and the second section having an independently sealable second part disposed therein,

when the first and second segments are brought close to each other based on an external force, the first and second components are brought close to each other and finally communicate to deliver the medical fluid in the first connector to the patient.

Drawings

FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention in a first operating position;

FIG. 2 is a cross-sectional view of a preferred embodiment of the present invention in a second operating position;

FIG. 3 is a cross-sectional view of a preferred embodiment of the present invention in a first operating position;

FIG. 4 is a cross-sectional view of a preferred embodiment of the present invention in a second operating position;

FIG. 5 is a schematic view showing the position of the indwelling needle according to the present invention.

List of reference numerals

100: first section 200: second section 110: first part

210: second member 111: the injection part 112: first check valve

211: wide portion 212: narrow portion 213: first convex part

214: the current limiting section 215: the expansion section 216: sealing element

217: spacer 2171: first hole 2172: gas channel

120: second hole 220: first limiting member 130: second position limiting part

218: the abutting portion 300: pressure adjusting component

Detailed Description

This is described in detail below with reference to fig. 1-5.

Indwelling needles are commonly used in intravenous injection and include steel needles, catheters, needle holders, white stoppers, transparent tees, extension tubes, single-handed clamps and positive pressure fittings or heparin caps. When the medical indwelling needle is used, the medicine is injected by connecting the transparent tee joint with the extension tube, but in the indwelling process, if a single-hand clamp on the extension tube is not stably fixed, blood of a patient easily flows back into the extension tube and coagulates in the tube to cause the invalidation of the indwelling needle.

Example 1

In response to the deficiencies of the prior art, the present invention provides an indwelling needle assembly with a valve comprising at least a first section 100 and a second section 200 that are movable relative to each other. The assembly is arranged on a transparent tee of an indwelling needle, a first part 110 capable of being sealed independently is arranged in the first section 100, and a second part 210 capable of being sealed independently is arranged in the second section 200. When the first section 100 and the second section 200 are distant from each other, the first member 110 can close the first section 100 alone; the second member 210 can individually close the second section 200 to divide the first connector into the first section 100 and the second section 200 which are independent from each other and are not communicated with each other, so that the needle and the extension tube can be completely separated, blood can not reach the extension tube through the first connector, and when the first section 100 and the second section 200 approach each other based on external force, the first member 110 and the second member 210 approach each other and are finally communicated to deliver the liquid medicine in the first connector to the patient, thereby facilitating the normal transfusion function when transfusion is needed, being flexible to use and simple to operate. Preferably, the first section 100 and the second section 200 are a sliding connection. Preferably, the first section 100 and the second section 200 have different sizes. The inner diameter of the first section 100 is equal to the outer diameter of the second section 200, such that the inner wall of the first section 100 and the outer wall of the second section 200 contact each other, to enable the first section 100 to be movably connected to each other relative to the second section 200. Preferably, the first section 100 and the second section 200 are threadedly connected. The first section 100 is provided with a first thread on the inner side wall, the second section 200 is provided with a second thread on the outer side wall, the first thread and the second thread are matched with each other, so that the relative position between the first section 100 and the second section 200 can be close to or far away from each other by rotating the first section 100 and the second section 200 from different directions, and the position between the first section 100 and the second section 200 can be fixed by means of the threads.

According to a preferred embodiment, the first part 110 is provided with an injection part 111 and a connecting piece for protruding into the interior of the second part 210. The injection part 111 maintains a uniform size so as to be able to protrude into the second part 210. Preferably, the end of the injection part 111 away from the second part 210 is connected with the inner wall of the first section 100 in a sealing way through a connecting sheet. Preferably, the injection part 111 and the connecting piece are made of the same material as the first section 100, and are manufactured in one process step. The arrangement mode can greatly save the processes of material configuration, mold feeding, demolding and the like during the preparation of the device, the materials which are the same as those of the first section 100 and the mold which is integrated with the first section 100 are used, so that the same assembly line and the same processes can be adopted with the infusion tube during the preparation, no additional manpower is needed, the assembly line does not need to be separately arranged, and the preparation cost of the device is greatly reduced. Preferably, the injection part 111 and the connecting piece may be made of the same material as the first section 100, for example, a polyurethane material meeting the medical and health safety standards.

According to a preferred embodiment, the injection part 111 is provided with a distally open first one-way valve 112 in an independently sealable manner, when the first section 100 and the second section 200 are separated from each other. The first check valve 112 is provided inside the injection unit 111, and is connected to the inner wall of the first check valve 112 in a closed manner. The first check valve 112 is opened in a distal direction, i.e., in a direction opposite to the flow direction of the medical fluid. Therefore, when the first member 110 is separated from the second member 210, the pressure of the liquid medicine towards the closing direction of the first one-way valve 112 will push the first one-way valve 112 to close, thereby enabling the first member 110 to realize self-closing.

According to a preferred embodiment, the second part 210 is provided with a first protrusion 213 in such a way that the first non return valve 112 can be opened in a situation where the first part 110 and the second part 210 are connected to each other. The first protrusion 213 is disposed at an end of the second member 210 close to the first member 110. Preferably, the first protrusion 213 is provided in a conical shape, with the apex of the conical shape facing the first check valve 112 and the bottom facing the end of the second member 210 remote from the first member 110. Preferably, the diameter of the bottom surface of the taper is smaller than the inner diameter of the injection part 111, so that in case that the first protrusion 213 is entirely located in the injection part 111, the injection part 111 can also have a medical fluid flow passage through which the medical fluid is delivered into the second member 210.

According to a preferred embodiment, the second member 210 comprises a housing and a bellows capable of expanding an inner volume by squeezing or stretching, an outer wall of the bellows and an inner wall of the housing constituting a fluid passage when the first member 110 and the second member 210 are coupled to each other. Preferably, the housing includes a narrow portion 212 and a wide portion 211 that are integrally formed. The narrow portion 212 is disposed at an end of the wide portion 211 near the first member 110. The inner diameter of the narrow portion 212 is the same as the outer diameter of the injection portion 111, so that the injection portion 111 can be inserted into the narrow portion 212 and can slide in a sealing manner with respect to the narrow portion 212 to prevent leakage of the liquid medicine. Preferably, the telescopic portion is provided inside the housing with a gap with the inner wall of the housing, so that when the first section 100 and the second section 200 are close to each other and the injection portion 111 of the first member 110 and the narrow portion 212 inserted into the second member 210 and in fluid communication with the narrow portion 212, the opened medical fluid in the first member 110 can enter the fluid passage between the housing and the telescopic portion and further be delivered proximally into the vein of the user.

According to a preferred embodiment, the bellows comprises a bellows section and a flow restriction section 215 connected to each other. Preferably, the flow restriction section 215 is disposed at an end of the telescoping section proximate the first member 110. Preferably, the expansion section is set to have a length equal to or greater than that of the wide portion 211 under the natural length. The outer diameter of the flow restriction section 215 is equal to the inner diameter of the narrow portion 212. With such an arrangement, in a state where the telescopic segment is not pressed by an external force, the telescopic segment can abut the flow restriction segment 215 into the narrow portion 212 based on its own elastic force to achieve sealing of the fluid passage of the second component 210. Preferably, the bottom surface of the tapered first protrusion 213 is connected to an end of the current restricting end near the first member 110. And, the end of the flow restriction end close to the first member 110 is further provided with an interference surface for the injection part 111 to stably abut against. And, in the case where the end surface of the injection part 111 abuts on the abutting surface and the first protrusion 213 opens the first check valve 112, there is also a liquid passage between the first protrusion 213 and the injection part 111 for the liquid to flow from the first part 110 into the second part 210. Preferably, the injection part 111 of the first part 110 is at least partially located in the narrow part 212 of the second part 210, in case the first part 110 and the second part 210 are most distant from each other. Through such a setting mode, can realize in the separation of first section 100 and second section 200 and the in-process that is close to, realize closing and opening the narrow end of second part 210 fast, the device is small and exquisite in structure, and weight is light and handy, can reduce the burden that the user wore to the mistake that the user wore in the process touches the probability has been reduced. And can avoid microorganism entering the liquid flow path of first part 110 and second part 210 to pollute the liquid medicine, improve the safety of device and in the life of sanitary standard scope.

According to a preferred embodiment, the end of the housing near the second section 200 is provided with a septum 217 connected to the end of the telescoping section near the second section 200, and the septum 217 is provided with a first hole 2171 corresponding to the fluid passage for communicating the fluid passage with the interior of the first section 100 to connect the fluid passage with the needle of an indwelling needle for delivering the liquid to the patient. Preferably, the shape of spacer 217 is the same as the cross-sectional shape of second section 200, and the size of spacer 217 is the same as the inner diameter of second section 200, so that spacer 217 can be sealingly disposed in second section 200.

According to a preferred embodiment, the inner space of the bellows is in gaseous communication with the environment via a gas passage 2172 provided in the septum 217 and on the first section 100, so that the bellows, when compressed, can expel gas to the environment via the gas passage 2172, and when extended, can draw air from the environment via the gas passage 2172, so that the bellows and the fluid passage are isolated from each other, thereby preventing the ingress of external gases into the medical fluid contaminating the fluid passage and causing infection of the user. Preferably, the flow restriction section 215 communicates with the inner space of the telescopic section, so that in case the telescopic section moves toward the narrow portion 212 by elastically pushing the flow restriction section 215, the flow restriction section 215 can also rebound upon external inhalation, thereby speeding up the time for the telescopic section to return into the narrow portion 212 to avoid leakage of the liquid medicine.

According to a preferred embodiment, a seal 216 is provided on the outer side wall of the housing adjacent to the first section 100 in such a way as to enable the first section 100 to be connected hermetically to the second section 200. Preferably, the sealing member 216 is a sliding sealing member 216, so that the sealing connection between the first section 100 and the second section 200 can be always maintained when the first section 100 and the second section 200 move relative to each other, and the external air is prevented from entering and polluting the first component 110 and the second component 210 and further polluting the liquid medicine.

According to a preferred embodiment, the first section 100 is provided with second holes 120 in such a way as to maintain the air pressure equilibrium inside the first section 100 during the movement of the first section 100 and the second section 200 with respect to each other, the second holes 120 being provided with a filter membrane in such a way as to keep the first part 110 clean. Preferably, in the case where the first section 100 and the second section 200 are connected to each other and the first member 110 and the second member 210 are connected to each other, a first gas space which can communicate with the external environment only through the second hole 120 exists between the first member 110 and the second member 210. When the first section 100 and the second section 200 are brought closer together, the volume of the first gas space is reduced, thereby exhausting the gas inside to the external environment through the second hole 120. When the first section 100 and the second section 200 are distant from each other, the volume of the first gas space increases, thereby sucking gas from the outside through the second hole 120. The gas entering the first gas space from the second holes 120 is filtered by the filter membrane on the second holes 120, so that bacteria in the air can be filtered, and the risk of the bacteria entering the first part 110 or the second part 210 to pollute the liquid medicine is reduced.

According to a preferred embodiment, the filter membrane can be replaced. Preferably, the filter membrane is removably attached to the second well 120. The detachable connection may be, for example, a screw connection through a connecting member or the like. For example, the filter membrane is fixedly disposed on a cross section of a fixing ring, the fixing ring is provided with a first thread, the second hole 120 is provided with a second thread, and the first thread and the second thread are coupled to each other.

According to a preferred embodiment, the first segment 100 and the second segment 200 are provided with a first retaining element 220 and a second retaining element 130 that engage with each other in such a way as to be able to remain in a first operating position, in which they are distanced from each other, and in a second operating position, in which they are close to each other. Preferably, the first limiting member 220 may be, for example, a convex portion circumferentially disposed on the outer side of the first segment 100. The second retaining member 130 may be, for example, a socket having a concave portion capable of receiving the convex portion. When the first limiting member 220 rotates to a position not corresponding to the second limiting member 130, the relative position between the first segment 100 and the second segment 200 is fixed and cannot move relative to each other, so as to achieve locking at the first working position or the second working position. When the first limiting member 220 rotates to correspond to the second limiting member 130, the first segment 100 and the second segment 200 can move relative to each other to achieve unlocking.

Example 2

This embodiment is a supplement to and an improvement of embodiment 1, and repeated contents are not described again.

The embodiment discloses an indwelling needle, which at least comprises a first connector for connecting an extension tube, wherein the first connector comprises a first section 100 and a second section 200 which can move relative to each other, a first part 110 which can be independently sealed is arranged in the first section 100, a second part 210 which can be independently sealed is arranged in the second section 200, and when the first section 100 and the second section 200 approach each other based on external force, the first part 110 and the second part 210 approach each other and finally communicate to deliver the liquid medicine in the first connector to a patient.

Example 3

This embodiment is a further improvement on embodiments 1 and 2, and repeated contents are not repeated.

The present embodiment provides a valved indwelling needle assembly comprising at least a first segment 100 and a second segment 200 which are movable relative to each other. The assembly is arranged on a transparent tee of an indwelling needle, a first part 110 is arranged in the first section 100, and a second part 210 capable of being sealed independently is arranged in the second section 200. When the first section 100 and the second section 200 are moved away from each other to the first working position, the first connector is separated into the first section 100 and the second section 200 which are independent from each other and are not communicated with each other, so that the needle and the extension tube can be completely separated, and blood can not reach the extension tube through the first connector. At this time, the space between the first section 100 and the second section 200 is completely occupied by the input catheter sealing liquid, so that the indwelling needle tube is prevented from being polluted by microorganisms. Preferably, the first part 110 has an injection portion 111 for extending into the narrow portion 212 of the second part 210. The outer wall of the injection part 111 is in sliding sealing connection with the inside of the narrow portion 212, so that when the first section 100 and the second section 200 are slid relative to each other, the injection part 111 slides relative to the narrow portion 212 and keeps the liquid passage of the indwelling needle sealed, and liquid does not flow out from the gap between the injection part 111 and the narrow portion 212. Preferably, an abutment 218 is connected to the end of the flow restrictor section 214 of the second section 200 proximate the first section 100. The abutment 218 is coaxially connected with the flow restriction section 214, and the abutment 218 is circumferentially provided with a groove. The groove is used for allowing the liquid in the first section 100 to pass through the groove into the wide portion 211 after passing through the injection portion 111, then to enter the needle tip portion of the indwelling needle through the first hole 2171, and to flow from the needle tip portion into the blood of the patient in the case where the first member 110 and the second member 210 are communicated. Preferably, an end of the injection part 111 close to the second section 200 abuts against an end of said abutment 218 close to the first section 100, so that the abutment 218 can be pushed by the outer wall of the injection part 111 and the liquid inside the injection part 111 can enter into the groove of the abutment 218. The telescopic section 215 is compressed by the pushing of the injection part 111, so that the flow restriction section 214 can be disconnected from the narrow part 212, and the liquid that can enter the groove of the abutment 218 can flow into the cavity of the wide part 211.

According to a preferred embodiment, the end of the white septum of the indwelling needle, which is far away from the catheter, is formed with a pressure adjusting member 300 at the end after the steel needle is pulled out. The pressure adjustment member 300 may be a piston-like structure. The gas outlet of the gas passage 2172 and the pressure adjustment member 300. Gas can be injected into or sucked out of the gas passage 2172 through the pressure adjustment member 300 so that the expansion and contraction of the telescopic section 215 can also be controlled by an external operation. That is, after inserting the catheter of the indwelling needle and the steel needle into the corresponding position in the patient's blood vessel, the steel needle is pulled out and the septum is able to maintain the seal, at which time the gas pressure in the telescopic section 215 can be relieved by the action of the formed pressure providing means, such as a piston, by pulling the piston rod or the like, facilitating its contraction, so that the flow restriction section 214 comes out of the narrow portion 212, so that the first section 100 and the second section 200 are in liquid communication. When it is desired to quickly block the fluid communication between the first section 100 and the second section 200, the gas pressure inside the telescopic section 215 can be increased, for example, by the action of pushing the piston rod, so that the telescopic section 215 can be quickly extended to feed the flow restriction section 214 into the narrow section 212, blocking the fluid flow path.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. An indwelling needle assembly with a valve, the assembly comprising at least a first section (100) and a second section (200) movable relative to each other, the first section (100) having a sealable first part (110) disposed therein, the second section (200) having an independently sealable second part (210) disposed therein,

when the first section (100) and the second section (200) approach each other based on an external force, the first part (110) and the second part (210) approach each other and finally communicate to deliver the medical fluid in the first joint to the patient.

2. The indwelling needle assembly according to claim 1, wherein the first part (110) is provided with an injection part (111) for projecting into the interior of the second connector, the second part (210) being provided with an abutment (218) close to the injection part (111) in such a way as to be able to abut against the injection part (111) and to communicate the first section (100) and the second section (200) on the basis of the abutment liquid when the first section (100) and the second section (200) are close to each other.

3. The indwelling needle assembly according to any of the previous claims, wherein the injection part (111) is provided with a first one-way valve (112) opening towards the distal end in an independently sealable manner, in the case where the first section (100) and the second section (200) are blocked from each other;

the second member (210) is provided with a first protrusion (213) so as to be able to open the first check valve (112) when the first member (110) and the second member (210) are connected to each other.

4. The indwelling needle assembly of any preceding claim, wherein the second component (210) comprises a housing and a bellows capable of expanding internal volume by compression or stretching, the bellows outer wall and the housing inner wall forming a fluid passage when the first component (110) and the second component (210) are connected to each other.

5. An indwelling needle assembly according to any preceding claim, in which the telescopic portion comprises a telescopic section (215) and a flow restrictor section (214) connected to each other, the flow restrictor section (214) being in close contact with the end of the housing adjacent the first member (110) to close the second member (210) when the first member (110) and the second member (210) are moved away from each other.

6. An indwelling needle assembly according to any preceding claim, in which the end of the housing adjacent the second section (200) is provided with a septum (217) which is connected to the end of the telescopic section (215) adjacent the second section (200), the septum (217) being provided with a first aperture (2171) for communicating the fluid passage with the interior of the first section (100) at a position corresponding to the fluid passage.

7. An indwelling needle assembly according to any preceding claim, in which the housing is provided with a seal (216) on its outer side wall adjacent the first section (100) in a manner to enable the first section (100) to be sealingly connected to the second section (200).

8. An indwelling needle assembly according to any preceding claim, in which the first section (100) is provided with a second aperture (120) in such a way as to maintain a balance of air pressure within the first section (100) during movement of the first section (100) and the second section (200) with respect to each other, the second aperture (120) being provided with a filter membrane in such a way as to keep the first component (110) clean.

9. The indwelling needle assembly according to any of the preceding claims, wherein the first segment (100) and the second segment (200) are provided with a first stop (220) and a second stop (130) that engage each other in such a way as to be able to be held in a first operative position, distanced from each other, and a second operative position, approached to each other.

10. An indwelling needle comprising at least a first connector for connecting an extension tube, the first connector comprising a first section (100) and a second section (200) movable relative to each other, the first section (100) having an independently sealable first member (110) disposed therein, the second section (200) having an independently sealable second member (210) disposed therein,

when the first section (100) and the second section (200) approach each other based on an external force, the first part (110) and the second part (210) approach each other and finally communicate to deliver the medical fluid in the first joint to the patient.

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