CN113616877B - Indwelling needle assembly with valve - Google Patents

Abstract

The present invention relates to an indwelling needle assembly with a valve, including at least a first section and a second section 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

An indwelling needle assembly with a valve

technical field

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

Background technique

The venous indwelling needle can avoid repeated punctures during use, reduce the workload of nurses and the pain of patients, and facilitate the first aid of critically ill patients. The indwelling needle needs to be sealed after use to avoid the patient's blood backflow, and also to prevent external pollutants from entering the patient's blood vessel through the indwelling needle and causing infection of the patient. During the use and maintenance of the existing indwelling needles, the attached clip is only a thin strip-shaped clip groove or an oval press-type clip body, which cannot completely fix the clip near the needle seat during use, even if Keep the clip as close as possible to the needle seat, and blood return will occur when the patient exerts a little force or no force. After the return blood coagulates in the indwelling needle infusion tube, it cannot continue to be used. Therefore, it is a crucial step to prolong the service life of the indwelling needle to keep the pipeline sealed and the blood not to flow back after the infusion.

Based on this technical problem, a large number of improvements have been made to the indwelling needle in the prior art. For example, CN108992737A discloses an indwelling needle for preventing thrombus without blocking the tube, which includes a three-way needle holder, an indwelling hose arranged at the front end of the three-way needle holder, And the puncture needle that penetrates into the indwelling hose from the rear end of the three-way needle holder, and a blocking structure is arranged in the three-way needle holder; after an infusion, the blocking structure penetrates into the front end of the indwelling hose and the The opening at the front end of the tube is blocked; during the infusion process, the blocking structure is retracted into the three-way needle seat behind the indwelling hose so as not to hinder the infusion flow rate. The device extends the needle tip of the indwelling needle from the flexible tube of the indwelling needle by controlling the blocking structure at the three-way vibrating distal end, so as to block the indwelling needle in the flexible tube of the user's blood vessel. However, when the device is inserted into the end of the flexible tube in the user's blood vessel, it will be contaminated with blood, and the blocked component after being retracted again will contaminate blood to other parts of the blocked component, and as time goes by, the blood remains Bacteria will grow, and the device is not equipped with a structure to clean or sterilize the blocking component, so when the blocking component is used to block the indwelling needle next time, the bacteria will be directly transported into the blood of the user, causing infection of the patient . Therefore the use process of this device does not meet the aseptic safety standard of medical treatment, and hidden danger is very great in use process.

CN205379514U discloses a slow-release positive pressure device and its indwelling needle, including a screw joint, a front tee, a slow-release catheter, a middle catheter, a small regulator, a rear three-way and a liquid reservoir, and the small regulator is sleeved on the middle catheter , the two ends of the slow-release catheter and the middle catheter are respectively connected to the double-hole ends of the front and rear tees, and other accessories are connected to each other. The indwelling needle slow-release positive pressure device is equipped with double catheters, and one of the catheters has a micro The other catheter is a medium catheter with a universal pore size. After the middle catheter is clamped by a small regulator, the hydraulic pressure released by its reservoir creates pressure, and the physiological saline slowly flows out from the micropore of the slow-release catheter to the indwelling needle. Infiltrate the blood vessel after the catheter assembly. However, the small regulator of this device is easy to be accidentally touched during the process of being fixed on the user's hand. After being accidentally touched, the physiological saline may quickly enter the patient's blood through the middle catheter based on the pressure of the liquid storage chamber, and lose the slow-release effect. . Moreover, the small regulator and the external liquid storage device will increase the volume of the device, increase the wearing burden of the user and the probability of false touch of the device.

In addition, on the one hand, due to differences in the understanding of those skilled in the art; on the other hand, due to the fact that the inventor has studied a large number of documents and patents when making the present invention, but due to space limitations, all details and contents have not been listed in detail, but this is by no means The present invention does not possess the characteristics of these prior art, on the contrary, the present invention already possesses all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an indwelling needle assembly with a valve. The assembly includes a first section and a second section that can move relative to each other. A first component capable of being independently sealed is arranged inside the first section, and a second component capable of being independently sealed is arranged inside the second section. When the first section and the second section are close to each other based on external force, the first part and the second part are close to each other and finally communicate to deliver the medical fluid in the first joint to the patient. Preferably, the first section and the second section are slidingly connected. Preferably, the first section and the second section are screwed together. Preferably, the assembly is arranged on the transparent tee of the indwelling needle.

Such an arrangement has the following advantages: the first section and the second section are connected in a sliding seal, and the first section and the second section can be connected or separated through a simple plug-in operation, when the first section and the second section When the two sections are separated, the first part and the second part are separated from each other and sealed independently, which can isolate the liquid end and the needle tip respectively, and the blood will not return from the needle tip to the liquid end, and even cannot reach the extension tube through the first joint. Therefore, there will be no problem of blood backflow blocking the tube, and when the first section and the second section communicate with each other, the separately closed first part and the second part can be connected to each other and opened to each other, so that the first part and the second part The two parts are in liquid communication with each other, so that the medical solution can enter the second part through the first part and then enter the patient's blood through the needle tip, so that the indwelling needle can be used after the next infusion. And the first section and the second section are movably connected to each other, the first section and the second section can protect the structure and cleanliness of the first part and the second part, and ensure that the next use is in line with medical hygiene specification.

According to a preferred embodiment, the first part is provided with an injection part for extending into the second joint. When the first section and the second section are separated from each other, the injection part is provided with a first one-way valve opened towards the distal end in an independently sealable manner.

Such an arrangement has the following advantages: the first one-way valve is opened toward the far end away from the patient, so the medicinal liquid flowing from the far end to the proximal end cannot open the first one-way valve, so that the first one-way valve can pass through the first one-way valve. One section is isolated and sealed. Therefore, when the first section is separated from the second section, the first part can be self-sealed through the first one-way valve, so as to prevent the liquid medicine added inside from leaking, so that it can be used for the next infusion. At the same time, it can prevent the microorganisms entering the junction of the first section and the second section from entering the first section through the injection part to contaminate the medicinal liquid.

According to a preferred embodiment, the second component is provided with a first protrusion in a manner capable of opening the first one-way valve when the first component and the second component are connected to each other. When the first part is connected with the second part, the first convex part can open the first one-way valve on the first part, and can allow the liquid in the first part to enter the second part through the injection part.

According to a preferred embodiment, the second part includes a shell and a telescopic part capable of expanding the internal volume by extrusion or stretching, and when the first part and the second part are connected to each other, the telescopic The external outer wall and the inner wall of the housing form a fluid channel.

According to a preferred embodiment, the telescoping portion includes a telescoping section and a restricting section connected to each other, and when the first part and the second part are separated from each other, the restricting section and the shell One end of the body close to the first part is tightly connected to close the second part.

Such an arrangement has the following advantages: by changing the length of the telescopic section, the connection between the flow-limiting section and the casing can be changed, thereby changing the presence or absence of the fluid channel formed between the casing and the telescopic section, and the telescopic section cooperates with the first The insertion and separation of the first section and the second section can realize the rapid sealing of the second part when the first section and the second section are quickly separated, without requiring other complicated operations, so that the second part can be kept The independent sealing state of the component and the first part prevents blood from entering the first component through the second component and then reaching the extension tube to block the pipeline. Moreover, the volume of the second component can be reduced, so as to reduce the volume weight and false touch probability of the device.

According to a preferred embodiment, the end of the housing close to the second section is provided with a spacer connected to the end of the telescopic section close to the second section, and the position of the spacer corresponding to the fluid channel is provided with a spacer for communicating with the fluid. The channel and the first hole inside the first section. to connect the fluid channel to the needle of the indwelling needle to deliver the fluid to the patient.

According to a preferred embodiment, the outer side wall of the housing close to the first section is provided with a seal capable of sealingly connecting the first section with the second section. Preferably, the seal is a sliding seal.

According to a preferred embodiment, the first section is provided with a second hole in a manner capable of maintaining air pressure balance inside the first section during the mutual movement of the first section and the second section , the second hole is provided with a filter membrane in a manner capable of keeping the first part clean.

Such an arrangement has the following advantages: the joint between the first section and the second section is sealed by the sliding seal, preventing the first part and the second part inside the first section and the second section from being exposed to outside air or Contamination by microorganisms; through the second orifice enables the space between the first part and the second part to be reduced or increased by sliding the first section and the second section relative to each other, by venting gas to the outside or from the outside Air is inhaled to achieve the balance of internal and external air pressure, so as to prevent the internal air pressure from being too low or too high to affect the relative activities of the first section and the second section. The filter membrane provided on the second hole can filter microorganisms in the gas during the process of inhaling gas, so as to prevent external microorganisms from entering the space along with the air and causing pollution to the first component or the second component. Preferably, the filter membrane is replaceable.

According to a preferred embodiment, the first section and the second section are provided with first limit positions that fit each other in such a way that they can be kept in a first working position away from each other and a second working position close to each other. piece and the second limiting piece.

Such a setting method has the following advantages: it can improve the anti-mistouch performance of the device, and the first section and the second section can be kept in the first working position respectively by setting the stoppers in the first working position and the second working position and the second working position, without releasing the connection between the first limiting member and the second limiting member through operation, the user’s touch in daily life will not cause the first segment and the second segment to Changing from the first working position or changing from the second working position, so the fixation is more stable and the effect of preventing false touches is better.

An indwelling needle at least includes a first joint for connecting an extension tube and a needle, the first joint includes a first section and a second section that can move relative to each other, and the inside of the first section is provided with a an independently sealed first component, the second section is internally provided with a second component capable of being independently sealed,

When the first section and the second section are close to each other based on external force, the first part and the second part are close to each other and finally communicate to deliver the medical fluid in the first joint to the patient.

Description of drawings

Fig. 1 is a sectional view when a preferred embodiment of the present invention is in the first working position;

Fig. 2 is a cross-sectional view of a preferred embodiment of the present invention when it is in a second working position;

Fig. 3 is a cross-sectional view of a preferred embodiment of the present invention when it is in the first working position;

Fig. 4 is a cross-sectional view of a preferred embodiment of the present invention when it is in a second working position;

Fig. 5 is a schematic diagram of the setting position of the present invention on the indwelling needle.

List of reference signs

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

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

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

214: Limiting section 215: Telescoping section 216: Seal

217: Spacer 2171: First Hole 2172: Gas Channel

120: second hole 220: first limiter 130: second limiter

218: abutment part 300: pressure adjustment part

Detailed ways

Detailed description will be given below in conjunction with accompanying drawings 1-5.

Indwelling needles are often used in intravenous injection, and indwelling needles include steel needles, catheters, needle handles, white isolation plugs, transparent tees, extension tubes, one-handed clips, and positive pressure connectors or heparin caps. When in use, the transparent tee is connected to the extension tube for drug injection, but during the indwelling process, if the one-handed clamp on the extension tube is not fixed stably, the patient's blood will easily flow back into the extension tube and coagulate in the tube, resulting in indwelling Needle fails.

Example 1

To address the shortcomings of the prior art, the present invention provides an indwelling needle assembly with a valve, which at least includes a first section 100 and a second section 200 that can move relative to each other. The assembly is arranged on the transparent tee of the indwelling needle, the first section 100 is provided with a first component 110 that can be independently sealed, and the interior of the second section 200 is provided with a second component 210 that can be independently sealed. When the first section 100 and the second section 200 are far away from each other, the first part 110 can separately close the first section 100; the second part 210 can separately close the second section 200, thereby separating the first joint The first section 100 and the second section 200 are independent of each other and not connected to each other, so that the needle and the extension tube can be completely isolated, blood will not be able to reach the extension tube through the first joint, and when the first section When 100 and second section 200 are close to each other based on external force, the first part 110 and second part 210 are close to each other and finally communicate to deliver the medical fluid in the first joint to the patient, so as to provide a normal Infusion function, flexible use and simple operation. Preferably, the first section 100 and the second section 200 are slidingly connected. Preferably, the first section 100 and the second section 200 have different dimensions. The inner diameter of the first section 100 is equal to the outer diameter of the second section 200, so that the inner wall of the first section 100 and the outer wall of the second section 200 are in contact with each other, so that the first section 100 can be opposed to the second section. 200 are actively connected to each other. Preferably, the first section 100 and the second section 200 are screwed together. The inner wall of the first section 100 is provided with a first thread, and the outer wall of the second section 200 is provided with a second thread, and the first thread and the second thread match each other, so that by rotating the first section from different directions 100 and the second section 200, to realize the relative position between the first section 100 and the second section 200 approaching or moving away, and the position between the first section 100 and the second section 200 can be realized by means of threads fixed.

According to a preferred embodiment, the first part 110 is provided with an injection part 111 and a connecting piece for extending into 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 component 210 is sealed and connected to the inner wall of the first section 100 through a connecting piece. Preferably, the injection part 111 , the connecting piece and the first section 100 are made of the same material, especially in one process. Such an arrangement can greatly save the process of material configuration, upper mold and demoulding when the device is prepared, and the use of the same material as the first section 100 and a mold integrated with the first section 100 can make it compatible with the infusion during production. The tubes are carried out with the same assembly line and process, and no additional manpower is required, nor is it necessary to set up a separate assembly line, which greatly reduces the production cost of the device. Preferably, the injection part 111 and the connecting piece can be made of the same material as that of the first section 100, for example, polyurethane material that meets medical and health safety standards.

According to a preferred embodiment, when the first section 100 and the second section 200 are separated from each other, the injection part 111 is provided with a first one-way valve 112 opened towards the distal end in a manner capable of being independently sealed. The first one-way valve 112 is disposed inside the injection part 111 , and is closed and connected with the inner wall of the first one-way valve 112 . The opening direction of the first one-way valve 112 is toward the distal end, that is, opposite to the flow direction of the medicinal liquid. Therefore, when the first part 110 is separated from the second part 210 , the pressure of the liquid medicine toward the closing direction of the first one-way valve 112 will push the first one-way valve 112 to close, so that the first part 110 can realize self-sealing.

According to a preferred embodiment, the second component 210 is provided with a first convex portion 213 in a manner capable of opening the first one-way valve 112 when the first component 110 and the second component 210 are connected to each other. The first protrusion 213 is disposed on an end of the second component 210 close to the first component 110 . Preferably, the first protrusion 213 is conical, with the apex of the cone facing the first one-way valve 112 and the bottom facing the end of the second component 210 away from the first component 110 . Preferably, the diameter of the bottom surface of the cone is smaller than the inner diameter of the injection part 111, so that when the first convex part 213 is completely inside the injection part 111, the injection part 111 can also have a liquid medicine flow channel, so that the liquid medicine flow can pass through the injection part 111. The channel delivers the medical fluid into the second part 210 .

According to a preferred embodiment, the second part 210 includes a housing and a telescopic part capable of expanding the internal volume by extrusion or stretching. When the first part 110 and the second part 210 are connected to each other, the outer wall of the telescopic part and the interior of the housing The walls form fluid channels. Preferably, the housing includes a narrow portion 212 and a wide portion 211 integrally formed. The narrow portion 212 is disposed at an end of the wide portion 211 close to the first component 110 . In addition, 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 slide sealingly relative to the narrow portion 212 to avoid leakage of medicinal liquid. Preferably, the telescoping part is arranged inside the casing, and there is a gap between the inner wall of the casing, so that when the first section 100 and the second section 200 are close to each other, and the injection part 111 and the insertion part of the first part 110 When it reaches the narrow part 212 of the second part 210 and is in liquid communication with the narrow part 212, the liquid medicine in the opened first part 110 can enter the fluid channel between the housing and the telescopic part, and further move toward the delivered into the user's vein.

According to a preferred embodiment, the telescopic part includes a telescopic section and a flow limiting section 215 connected to each other. Preferably, the restricting section 215 is disposed at an end of the telescoping section close to the first component 110 . Preferably, the telescopic section is set such that the length of the natural length is greater than or equal to the length of the wide portion 211 . The outer diameter of the restriction section 215 is equal to the inner diameter of the narrow portion 212 . Through such an arrangement, when the telescopic section is not squeezed by external force, the telescopic section can press the restrictor section 215 against the narrow part 212 based on its own elastic force, so as to realize the control of the fluid channel of the second component 210 seal. Preferably, the bottom surface of the tapered first protrusion 213 is connected to the end of the restrictor close to the first component 110 . Moreover, the end of the restrictor end close to the first component 110 is also provided with an abutting surface for the injection part 111 to stably abut against. Moreover, when the end surface of the injection part 111 abuts against the contact surface, and the first convex part 213 opens the first one-way valve 112, there is still a supply of liquid from the first convex part 213 and the injection part 111. One part 110 flows to the liquid channel in 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 when the first part 110 and the second part 210 are farthest from each other. Through such an arrangement, the closing and opening of the narrow end of the second part 210 can be realized quickly during the process of separating and approaching the first section 100 and the second section 200. The structure of the device is small and light, and it can The wearing burden of the user is reduced, and the probability of false touch during the wearing process of the user is reduced. In addition, microorganisms can be prevented from entering the liquid channels of the first part 110 and the second part 210 to contaminate the liquid medicine, thereby improving the safety of the device and the service life within the range of hygienic standards.

According to a preferred embodiment, the end of the housing close to the second section 200 is provided with a spacer 217 connected to the end of the telescopic section close to the second section 200, and the position of the spacer 217 corresponding to the fluid channel is provided with a spacer for communicating with the fluid. The channel and the first hole 2171 inside the first section 100 are used to connect the fluid channel to the needle of the indwelling needle to deliver the fluid to the patient. Preferably, the shape of the spacer 217 is the same as the cross-sectional shape of the second section 200, and the size of the spacer 217 is the same as the inner diameter of the second section 200, so that the spacer 217 can be sealingly arranged on the second section 200 middle.

According to a preferred embodiment, the internal space of the telescopic section communicates with the external environment through the gas channel 2172 provided in the spacer 217 and on the first section 100, so that the telescopic section can pass through the gas channel 2172 when compressed. The gas is discharged into the external environment, and air can be sucked from the external environment through the gas channel 2172 when stretching, so that the expansion and contraction part and the fluid channel are isolated from each other, thereby preventing the external gas from entering and contaminating the liquid medicine in the fluid channel and causing User infection. Preferably, the restrictor section 215 communicates with the inner space of the telescopic section, so that when the telescopic section elastically pushes the restrictor section 215 to move toward the narrow portion 212, the restrictor section 215 can also rebound based on external suction, thereby Speed up the time for the telescopic section to return to the narrow portion 212, so as to avoid leakage of medicinal liquid.

According to a preferred embodiment, a sealing member 216 is provided on the outer wall of the housing close to the first section 100 in such a way that the first section 100 and the second section 200 can be airtightly connected. Preferably, the seal 216 is a sliding seal 216 so that the sealed connection of the first section 100 and the second section 200 can always be maintained in case the first section 100 and the second section 200 move relative to each other , to prevent outside air from entering to contaminate the first component 110 and the second component 210 and further contaminating the liquid medicine.

According to a preferred embodiment, the first section 100 is provided with a second hole 120 in a manner capable of maintaining air pressure balance inside the first section 100 during the mutual movement of the first section 100 and the second section 200, The second hole 120 is provided with a filter membrane in such a manner that the first member 110 can be kept clean. Preferably, when the first section 100 and the second section 200 are connected to each other and the first part 110 and the second part 210 are connected to each other, the first part 110 and the second part 210 exist only through the first part 110 and the second part 210. The second hole 120 is the first gas space communicated with the external environment. When the first section 100 and the second section 200 are close to each other, the volume of the first gas space is reduced, so that the gas inside is discharged to the external environment through the second hole 120 . When the first section 100 and the second section 200 are separated 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 hole 120 will be filtered by the filter membrane on the second hole 120, so as to filter the bacteria in the air and reduce the bacteria entering the first part 110 or the second part 210 to contaminate the liquid medicine risks of.

According to a preferred embodiment, the filter membrane can be replaced. Preferably, the filter membrane is detachably connected to the second hole 120 . The manner of the detachable connection may be, for example, threaded connection through a connecting part and the like. For example, the filter membrane is fixedly arranged on the cross section of a fixed ring, the fixed ring is provided with a first thread, and the second hole 120 is provided with a second thread, and the first thread and the second thread are matched with each other.

According to a preferred embodiment, the first section 100 and the second section 200 are provided with first stoppers 220 that fit each other in such a way that they can be kept in a first working position away from each other and a second working position close to each other. and the second limiting member 130. Preferably, the first limiting member 220 may be, for example, a convex portion circumferentially disposed outside the first section 100 . The second limiting member 130 may be, for example, a sleeve having a recess capable of accommodating the protrusion. When the first limiting member 220 is rotated to a position that does not correspond to the position of the second limiting member 130, the relative position between the first section 100 and the second section 200 is fixed and cannot move relative to each other, so as to realize the first working position. position or locking of the second working position. When the first limiting member 220 is rotated to correspond to the position of the second limiting member 130 , the first section 100 and the second section 200 can move relative to each other to realize unlocking.

Example 2

This embodiment is a supplement and improvement to Embodiment 1, and repeated content will not be repeated.

This embodiment discloses an indwelling needle, which at least includes a first joint for connecting an extension tube. The first joint includes a first section 100 and a second section 200 that can move relative to each other. The first section 100 is internally provided with The first part 110 capable of being independently sealed, and the second part 210 capable of being independently sealed is arranged inside the second section 200. When the first section 100 and the second section 200 approach each other based on external force, the first part 110 and the second section 200 The two parts 210 are close to each other and finally connected to deliver the medical fluid in the first joint to the patient.

Example 3

This embodiment is a further improvement on Embodiment 1 and Embodiment 2, and repeated content will not be repeated.

This embodiment provides an indwelling needle assembly with a valve, which at least includes a first section 100 and a second section 200 that can move relative to each other. The assembly is arranged on the transparent tee of the indwelling needle, the first part 110 is arranged inside the first section 100 , and the second part 210 which can be independently sealed is arranged inside the second section 200 . When the first section 100 and the second section 200 move away from each other to the first working position, the first joint is divided into the first section 100 and the second section 200 which are independent of each other and not communicated with each other, so that the The needle and the extension tube are completely separated, and blood cannot 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 locking liquid, so as to avoid microbial contamination in the indwelling needle tube. Preferably, the first part 110 has an injection part 111 for extending into the narrow part 212 of the second part 210 . The outer wall of the injection part 111 is in sliding sealing connection with the interior of the narrow part 212, so that when the first section 100 and the second section 200 slide relative to each other, the injection part 111 slides relative to the narrow part 212 and keeps the fluid passage of the indwelling needle sealed. , the liquid will not flow out from the gap between the injection part 111 and the narrow part 212 . Preferably, an abutting portion 218 is connected to the end of the restricting section 214 of the second section 200 close to the first section 100 . The abutting portion 218 is coaxially connected to the flow limiting section 214 , and grooves are provided on the abutting portion 218 in the circumferential direction. The groove is used to enable the liquid in the first section 100 to enter the wide portion 211 through the groove after passing through the injection part 111 when the first part 110 and the second part 210 are in communication, and then pass through the first hole 2171 It enters the needle tip of the indwelling needle and flows from the needle tip into the patient's blood. Preferably, an end of the injection part 111 close to the second section 200 abuts against an end of the abutment part 218 close to the first section 100, so that the abutment part 218 can be pushed by the outer wall of the injection part 111, and the inside of the injection part 111 The liquid can enter the groove of the abutting portion 218 . Pushed by the injection part 111 , the telescopic section 215 is compressed, so that the restrictor section 214 can be disconnected from the narrow part 212 , and the liquid that can enter the groove of the abutting part 218 can flow into the cavity of the wide part 211 .

According to a preferred embodiment, the end of the white isolation plug of the indwelling needle away from the catheter is formed with a pressure adjustment part 300 at the end after the steel needle is pulled out. The pressure adjustment component 300 may be a piston-like structure. The gas outlet of the gas channel 2172 is connected to the pressure adjustment component 300 . Gas can be injected into or sucked out of the gas channel 2172 through the pressure adjustment component 300, so that the extension and contraction of the telescopic section 215 can also be controlled by external operations. 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 isolation plug can keep sealing. The gas pressure in the telescoping section 215 can be released to facilitate its contraction, so that the restrictor section 214 escapes from the narrow portion 212 , so that the first section 100 and the second section 200 are in liquid communication. And when it is necessary to quickly cut off the liquid communication between the first section 100 and the second section 200, for example, by pushing the piston rod, the gas pressure inside the telescopic section 215 can be increased, so that the telescopic section 215 can be extended rapidly to Restricted section 214 feeds into narrow section 212, blocking the fluid flow path.

It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the scope of the disclosure of the present invention and fall within the scope of this disclosure. within the scope of protection of the invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative rather than limiting to the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims (8)

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;

the first part (110) is provided with an injection part (111) for protruding into the interior of the second connector, the second part (210) is provided with an abutting part (218) close to the injection part (111) in a manner that the abutting part can abut against the injection part (111) and communicates the first section (100) and the second section (200) based on abutting liquid when the first section (100) and the second section (200) are close to each other;

the second member (210) includes a housing and a bellows portion capable of changing an inner volume by pressing or stretching, an outer wall of the bellows portion 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, and the housing includes a narrow portion (212) and a wide portion (211) which are integrally formed.

2. The indwelling needle assembly according to claim 1, wherein, in the event that the first section (100) and the second section (200) are shut off from each other, the injection part (111) is provided with a first one-way valve (112) opening towards the distal end in an independently sealable manner;

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.

3. The indwelling needle assembly of claim 2, wherein the telescopic portion comprises a telescopic section (215) and a flow restrictor section (214) connected to each other, the flow restrictor section (214) being tightly connected to 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.

4. The indwelling needle assembly according to claim 3, wherein the end of the housing adjacent to the second section (200) is provided with a septum (217) connected to the end of the telescopic section (215) adjacent to the second section (200), the septum (217) being provided with a first hole (2171) for communicating the fluid passage with the interior of the first section (100) at a position corresponding to the fluid passage.

5. The indwelling needle assembly of claim 4, wherein a seal (216) is provided on the outer side wall of the housing adjacent the first section (100) in a manner to enable the first section (100) to be sealingly connected to the second section (200).

6. The indwelling needle assembly of claim 5, wherein the first section (100) is provided with a second aperture (120) in a manner 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 each other, the second aperture (120) being provided with a filter membrane in a manner to maintain the first member (110) clean.

7. The indwelling needle assembly according to claim 6, 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, remote from each other, and a second operative position, close to each other.

8. 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;

the first part (110) is provided with an injection part (111) for protruding into the interior of the second connector, the second part (210) is provided with an abutting part (218) close to the injection part (111) in a manner that the abutting part can abut against the injection part (111) and communicates the first section (100) and the second section (200) based on abutting liquid when the first section (100) and the second section (200) are close to each other;

the second member (210) includes a housing and a telescopic part capable of changing an inner volume by being pressed or stretched, an outer wall of the telescopic part 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, and the housing includes a narrow part (212) and a wide part (211) which are integrally formed.

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