CN217593517U

CN217593517U - Infusion connecting clamp

Info

Publication number: CN217593517U
Application number: CN202220826011.5U
Authority: CN
Inventors: 赵征; 吕燕松; 薛菊; 朱颖; 邢宵宵
Original assignee: Beijing Shijitan Hospital
Current assignee: Beijing Shijitan Hospital
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-10-18
Anticipated expiration: 2032-04-11

Abstract

The embodiment of the application provides an infusion connecting clamp, and belongs to the technical field of medical instruments. The infusion connecting clamp is used for connecting an infusion bag and an infusion needle, the infusion connecting clamp comprises a connecting rod and two clamping pieces, the two clamping pieces are arranged on the connecting rod at intervals so as to be respectively arranged corresponding to the infusion bag and the infusion needle, each clamping piece comprises at least two clamping blocks, and a clamping hole is formed between the clamping blocks; when the clamping piece is in the opening state, the clamping pieces are opened to be used for clamping in an infusion bag or an infusion needle; when the clamping piece is in a closed state, the clamping blocks are attached to clamp the infusion bag or the infusion needle. The infusion connecting clamp can improve the stability of an infusion bag and an infusion needle, so that the infusion bag and the infusion needle are not easy to separate, and the infusion continuity and safety of a patient are improved.

Description

Infusion connecting clamp

Technical Field

The application relates to the technical field of medical equipment, in particular to an infusion connecting clamp.

Background

At present, intravenous infusion is a common means and a common treatment method for treating diseases, an infusion apparatus is often dropped due to drawing, dragging and the like in the infusion process, and when the drawing pressure is too high, the infusion apparatus can be dropped from a bottle stopper of an infusion bottle. Especially, the skin of the child patient is adjusted, the infusion tube is easy to tear during infusion to pull out the infusion needle from the infusion bag and drop to the ground, medical staff need to disinfect the infusion needle again and insert the infusion needle again, pain is caused to the patient, and the workload of the medical staff is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an infusion connecting clamp, can improve the stability of infusion bag and infusion needle for infusion bag and infusion needle are difficult for breaking away from, have improved patient's infusion's continuity and security.

The embodiment of the application provides an infusion connecting clamp, which is used for connecting an infusion bag and an infusion needle, and comprises a connecting rod and two clamping pieces, wherein the two clamping pieces are arranged on the connecting rod at intervals so as to be respectively arranged corresponding to the infusion bag and the infusion needle, each clamping piece comprises at least two clamping blocks, and clamping holes are formed between the clamping blocks; when the clamping piece is in the opening state, the clamping pieces are opened to be used for clamping in an infusion bag or an infusion needle; when the clamping piece is in a closed state, the clamping blocks are attached to clamp the infusion bag or the infusion needle.

In this scheme, through two holders on the connecting rod, two holders are corresponding to infusion bag and transfusion needle setting in the position on the connecting rod, when infusing patient like this, let a plurality of clamp splices rotate in the holder and open, can block into infusion bag's stereoplasm bag mouth department and the contact pin of transfusion system like this, then let the holder press from both sides tightly again, thereby make two holders centre gripping respectively on infusion bag's stereoplasm bag mouth department and the contact pin of transfusion system, thereby can improve infusion bag and transfusion needle's stability, even patient is when standing up or removing, infusion bag and transfusion needle also are difficult for breaking away from, patient's infusion's continuity and security have been improved, prevent that the transfusion system from being dragged and pulled down, alleviate economic burden.

In some embodiments, the clamping member comprises two clamping blocks, the two clamping blocks are arranged oppositely, and a clamping hole is formed between the two clamping blocks.

In some embodiments, the clamping blocks are provided with clamping grooves, and the clamping grooves of the two clamping blocks are matched to form a clamping hole for clamping the infusion bag or the infusion needle, and the clamping hole is matched with the shape of the clamping end of the infusion bag or the infusion needle.

Among the above-mentioned technical scheme, through being formed with the draw-in groove on the clamp splice, two draw-in grooves cooperate to form the centre gripping hole that supplies infusion area or transfusion needle to hold, compare in directly adopting two clamp splice planes to press from both sides tight infusion bag of hindering easily, consequently the centre gripping hole can hold infusion bag or transfusion needle to have the guard action to the exposed core of infusion bag or transfusion needle, avoid causing the damage to infusion bag.

In some embodiments, the inner wall of the slot is provided with an elastic layer.

Among the above-mentioned technical scheme, be formed with the elastic layer through the inner wall at the draw-in groove, the elastic layer can take place the part owing to the pressurized and warp, can play the guard action to infusion bag and infusion needle on the one hand, and on the other hand can strengthen the clamping-holding action of holder to infusion bag or infusion needle for the holder is more firm to infusion bag or infusion needle centre gripping.

In some embodiments, the two clamping blocks are magnetic attraction elements with opposite magnetic poles.

Among the above-mentioned technical scheme, adopt for the magnetic attraction component that the magnetic pole is opposite through two clamp splices, can make two clamp splices can press from both sides tightly each other by utilizing magnetism, when needs open the holder, overcome magnetic force and just enable the holder and open, after infusion bag or transfusion needle are located the grip hole, because the magnetic pole of two clamp splices is opposite, can produce the effect of inhaling mutually, consequently two clamp splices draw close mutually in the effect of magnetic force is automatic to press from both sides tight infusion bag or transfusion needle.

In some embodiments, the two clamping blocks are respectively a first clamping block and a second clamping block, a buckle is arranged on one side of the first clamping block close to the second clamping block, a clamping hole is correspondingly arranged on the second clamping block, and the buckle is in clamping fit with the clamping hole so that the clamping piece is maintained in a closed state.

According to the technical scheme, the clamping buckles and the clamping holes are respectively formed in the two clamping blocks, the clamping buckles are clamped and matched with the clamping holes, the clamping piece can be maintained in a closed state, and therefore the clamping effect on the infusion bag or the infusion needle is achieved.

In some embodiments, the clip comprises a spring plate and a clamping block, the clamping block is used for matching with the clamping hole, and the clamping block is arranged on the first clamping block through the spring plate; the second clamping block is provided with a guide inclined plane which is used for guiding the clamping block to enter the clamping hole; when the clamping block moves towards the clamping hole along the guide inclined plane, the elastic sheet can be extruded to rotate so as to accumulate elastic potential energy, and the elastic potential energy is used for driving the elastic sheet to reset when the clamping block enters the clamping hole so as to clamp the clamping block in the clamping hole.

Among the above-mentioned technical scheme, the fixture block passes through the shell fragment setting on first clamp splice, can drive the shell fragment when the fixture block is compressed and take place to deform and rotate, and is provided with the direction inclined plane on the second clamp splice, and the direction inclined plane can guide the fixture block to get into the card hole, consequently only need press from both sides tightly when drawing close each other with two and paste, under the mating reaction of shell fragment and direction inclined plane, can realize the automatic lock joint in fixture block and card hole, and it is more convenient to operate.

In some embodiments, the second clamping block is provided with an unlocking rod, the side wall of the clamping hole on the second clamping block is provided with an unlocking hole communicated with the outside, the unlocking rod is slidably arranged in the unlocking hole, and the unlocking rod is used for applying thrust to the clamping block in the clamping hole so as to separate the clamping block from the clamping hole.

Among the above-mentioned technical scheme, through be equipped with the unlocking lever on the second clamp splice, when needs let the connecting clamp open, utilize the unlocking lever to promote the downthehole fixture block of card for fixture block and the separation of card hole just can let two clamp splices open like this, thereby take off the connecting clamp, it is very convenient to operate, only need promote the unlocking lever alright, just can realize the unblock in fixture block and card hole.

In some embodiments, a button for pushing the unlocking rod is arranged at one end, far away from the second clamping block, of the unlocking rod, a mounting groove for mounting the button is arranged at one side, far away from the clamping hole, of the second clamping block, the button is arranged in the mounting groove in a sliding mode, and at least part of the button protrudes out of the mounting groove.

Among the above-mentioned technical scheme, through being provided with the button on the unblock pole, can just realize the unblock in fixture block and card hole through acting on the button, compare in direct action unblock pole, the button part is located outside the second clamp splice, and the medical personnel of being convenient for press the button, and it is very convenient to operate.

In some embodiments, the connecting rod comprises an inner tube, an outer tube and a locking piece, wherein the opposite ends of the inner tube and the outer tube are respectively connected with the two clamping pieces; the outer tube is provided with a sliding cavity extending along the axial direction of the outer tube, and the inner tube is arranged in the sliding cavity in a penetrating way and can move along the axial direction of the sliding cavity; the retaining member is in threaded fit with the outer pipe, and one end of the retaining member can extend into the sliding cavity to limit the inner pipe to move along the axial direction of the inner pipe.

Among the above-mentioned technical scheme, through adopting the connecting rod for inside and outside sheathed tube form, the inner tube can slide along the outer tube, when the length of connecting rod is adjusted to needs, only need loosen the retaining member soon, the inner tube can slide along the outer tube like this, after the length adjustment of connecting rod targets in place, only need the retaining member of screwing, just can make the length of connecting rod fixed, the length adjustment convenient and fast of connecting rod.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of an infusion connector clip according to some embodiments of the present application;

FIG. 2 is a schematic view of a clamp in a closed position according to some embodiments of the present disclosure;

FIG. 3 is a schematic view of an embodiment of an infusion connection clip with the clamping members in an open position.

Icon: 10-a clamp; 11-a card slot; 12-a clamping hole; 20-a first clamp splice; 21-a spring plate; 22-a fixture block; 30-a second clamp block; 31-a clamping hole; 32-a guide ramp; 33-an unlocking lever; 34-a button; 40-a connecting rod; 41-inner tube; 42-an outer tube; 43-locking member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is further noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

The embodiment of the application provides an infusion connecting clamp, which is used for connecting an infusion bag and an infusion needle, and please refer to fig. 1, fig. 2 and fig. 3, the infusion connecting clamp comprises a connecting rod 40 and two clamping pieces 10, the two clamping pieces 10 are arranged on the connecting rod 40 at intervals, so that the two clamping pieces 10 are respectively arranged corresponding to the infusion bag and the infusion needle, the clamping piece 10 comprises at least two clamping blocks, and a clamping hole 12 is formed between the clamping blocks; referring to fig. 3, when the clamping member 10 is in the open state, the clamping blocks are opened to be used for clamping an infusion bag or an infusion needle; referring to fig. 2, when the clamping member 10 is in the closed state, the clamping blocks are attached to clamp the infusion bag or the infusion needle.

In this scheme, through two holder 10 on the connecting rod 40, two positions of holder 10 on connecting rod 40 are corresponding to infusion bag and the setting of transfusion needle, when infusing patient like this, let a plurality of clamp splices rotate in holder 10 and open, can block into the contact pin of infusion bag's stereoplasm bag mouth department and transfusion system like this, then let holder 10 press from both sides tightly, thereby make two holder 10 centre gripping respectively on the contact pin of the stereoplasm bag mouth department of infusion bag and transfusion system, thereby can improve the stability of infusion bag and transfusion needle, even patient is when standing up or removing, infusion bag and transfusion needle also are difficult for breaking away from, the continuity and the security of patient's infusion have been improved, prevent that the transfusion system from being dragged and pulled off, alleviate economic burden.

The two clamping members 10 may be identical or different in structure. In addition, the structure of the clamping member 10 may include a plurality of clamping blocks, for example, two, three, five, six, etc. In case the clamping member comprises five or six, etc., one side of the plurality of clamping blocks is hinged and the other side can be rotated along the hinge point. Understandably, the plurality of clamping blocks in the clamping member 10 may have a petal shape when in an open state and a lantern shape when in a closed state, which is not shown in the figures.

Optionally, referring to fig. 2 and 3, the clamping member 10 includes two clamping blocks, the two clamping blocks are disposed opposite to each other, and a clamping hole 12 is formed between the two clamping blocks.

In some embodiments, the clamping blocks are provided with clamping grooves 11, the clamping grooves 11 of the two clamping blocks are matched to form a clamping hole 12 for clamping an infusion bag or an infusion needle, and the clamping hole 12 is matched with the shape of the clamping end of the infusion bag or the infusion needle. Through being formed with draw-in groove 11 on the clamp splice, two draw-in grooves 11 cooperate to form the centre gripping hole 12 that supplies infusion area or transfusion needle to hold, compare in directly adopting two clamp splice planes to press from both sides tight infusion bag of hindering easily, consequently centre gripping hole 12 can hold infusion bag or transfusion needle to the exposed core to infusion bag or transfusion needle has the guard action, avoids causing the damage to infusion bag.

Wherein, the bayonet corresponding to the bayonet 11 on the clamping piece 10 on the transfusion belt should be a little bit bigger, and the bayonet corresponding to the bayonet 11 of the clamping piece on the transfusion needle can be a little bit smaller, let the clamping piece 10 correspond to the infusion bag or the shape of the clamping end of the transfusion needle match alright.

In some embodiments, the inner wall of the card slot 11 is provided with an elastic layer. Through being formed with the elastic layer at the inner wall of draw-in groove 11, the elastic layer can take place the part owing to the pressurized and warp, can play the guard action to infusion bag and infusion needle on the one hand, and on the other hand can strengthen the clamping-action of holder 10 to infusion bag or infusion needle for holder 10 is more firm to infusion bag or infusion needle centre gripping.

Wherein, the elastic layer can be a silica gel layer, a sponge layer, rubber or a foam layer and the like which are made of elastic materials. In this embodiment, the elastic layer is a silica gel layer.

In some embodiments, the two clamping blocks are magnetic attraction elements with opposite magnetic poles. The magnetic suction elements with opposite magnetic poles are adopted by the two clamping blocks, so that the two clamping blocks can be clamped mutually by utilizing magnetism, when the clamping part 10 is required to be opened, the clamping part 10 can be opened by overcoming the magnetic force, and after the infusion bag or the infusion needle is positioned in the clamping hole 12, the two clamping blocks are automatically drawn together and attracted by the magnetic poles of the two clamping blocks, so that the infusion bag or the infusion needle is clamped.

Wherein, the magnetic attraction component can be a permanent magnet or an electromagnet. In addition, one of the two clamping blocks can be a metal block, and the other clamping block can be a permanent magnet, so that the two clamping blocks can be attached to each other.

In some embodiments, the two clamping blocks are a first clamping block 20 and a second clamping block 30, respectively, a buckle is disposed on one side of the first clamping block 20 close to the second clamping block 30, a clamping hole 31 is correspondingly disposed on the second clamping block 30, and the buckle is in clamping fit with the clamping hole 31, so that the clamping member is maintained in a closed state. Through being provided with buckle and card hole 31 on two clamp splice respectively, utilize buckle and the cooperation of card hole 31 joint, equally can make the holder maintain closed state to realize the clamping effect to infusion bag or transfusion needle.

In some embodiments, the clip includes a spring 21 and a latch 22, the latch 22 is used for cooperating with the clip hole 31, and the latch 22 is disposed on the first clip 20 through the spring 21; the second clamping block 30 is provided with a guide inclined surface 32, and the guide inclined surface 32 is used for guiding the fixture block 22 to enter the fixture hole 31; when the latch 22 moves along the guiding inclined plane 32 toward the latch hole 31, the resilient plate 21 can be pressed to rotate to accumulate elastic potential energy, and the elastic potential energy is used for driving the resilient plate 21 to reset when the latch enters the latch hole 31, so that the latch 22 is latched in the latch hole 31.

The fixture block 22 is arranged on the first clamping block 20 through the elastic sheet 21, when the fixture block 22 is pressed, the elastic sheet 21 is driven to deform and rotate, the guide inclined plane 32 is arranged on the second clamping block 30, and the guide inclined plane 32 can guide the fixture block 22 to enter the fixture hole 31, so that when two clamps are required to be mutually close to each other, under the matching action of the elastic sheet 21 and the guide inclined plane 32, the fixture block 22 can be automatically fastened with the fixture hole 31, and the operation is more convenient.

Specifically, when the latch 22 moves along the guiding inclined plane 32 toward the latch hole 31, the resilient plate 21 can be pressed to rotate to accumulate elastic potential energy, and the elastic potential energy is used for driving the resilient plate 21 to reset when the latch enters the latch hole 31, so that the latch 22 is latched in the latch hole 31.

In some embodiments, the second clamping block 30 is provided with an unlocking rod 33, a side wall of the clamping hole 31 of the second clamping block 30 is provided with an unlocking hole communicated with the outside, the unlocking rod 33 is slidably arranged in the unlocking hole, and the unlocking rod 33 is used for applying a pushing force to the fixture block 22 positioned in the clamping hole 31 so as to separate the fixture block 22 from the clamping hole 31. Through be equipped with unlocking lever 33 on second clamp splice 30, when needs let the connecting clamp open, utilize unlocking lever 33 to promote the fixture block 22 in the card hole 31 for fixture block 22 and the separation of card hole 31 just can let two clamp splices open like this, thereby take off the connecting clamp, the operation is very convenient, only need promote unlocking lever 33 alright, just can realize the unblock of fixture block 22 and card hole 31.

In some embodiments, a button 34 for pushing the unlocking rod 33 is disposed on an end of the unlocking rod 33 away from the second clamping block 30, a mounting groove for mounting the button 34 is disposed on a side of the second clamping block 30 away from the locking hole 31, the button 34 is slidably disposed in the mounting groove, and at least a portion of the button 34 protrudes out of the mounting groove. The button 34 is arranged on the unlocking rod 33, so that the clamping block 22 and the clamping hole 31 can be unlocked by acting on the button 34, compared with the unlocking rod 33 which directly acts, the button 34 is partially positioned outside the second clamping block 30, the button 34 is convenient for medical staff to press, and the operation is very convenient.

In some embodiments, the connecting rod 40 is a telescoping rod, such that the spacing between the two clamps 10 is adjustable. Because the interval between infusion bag and the transfusion needle is unset, consequently through setting up connecting rod 40 into the telescopic link, through adjusting the telescopic link, alright with the interval between two holders of adjusting to come with infusion bag and transfusion needle looks adaptation, improved the application scope of connecting clamp.

In some embodiments, the connecting rod 40 includes an inner tube 41, an outer tube 42 and a locking member 43, and opposite ends of the inner tube 41 and the outer tube 42 are respectively connected to the two clamping members; the outer tube 42 is provided with a sliding cavity extending along the axial direction of the outer tube, and the inner tube 41 is arranged in the sliding cavity in a penetrating way and can move along the axial direction of the sliding cavity; a locking member 43 is threadedly engaged with the outer tube 42, and one end of the locking member 43 can be inserted into the sliding chamber to restrict the inner tube 41 from moving in its axial direction. Through the form that adopts connecting rod 40 for outer sleeve pipe, inner tube 41 can slide along outer tube 42, when the length of connecting rod 40 needs to be adjusted, only need unscrew retaining member 43, inner tube 41 can slide along outer tube 42 like this, after the length adjustment of connecting rod 40 targets in place, only need screw retaining member 43, just can make the length of connecting rod 40 fixed, the length adjustment convenient and fast of connecting rod 40. Wherein the locking member 43 may be a screw.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides an infusion connecting clamp for connect infusion bag and transfusion needle, its characterized in that includes:

a connecting rod;

the two clamping pieces are arranged on the connecting rod at intervals, the positions of the two clamping pieces on the connecting rod respectively correspond to the infusion bag and the infusion needle, the clamping pieces comprise at least two clamping blocks, and clamping holes are formed among the clamping blocks;

when the clamping piece is in the open state, the clamping pieces are opened to be used for clamping in the infusion bag or the infusion needle; when the clamping piece is in the closed state, the clamping blocks are attached to clamp the infusion bag or the infusion needle.

2. The infusion connector clip of claim 1, wherein said clip member comprises two clip pieces, said two clip pieces being disposed in opposition to one another, said clip holes being formed between said two clip pieces.

3. The infusion connection clamp according to claim 2, wherein the clamping blocks are provided with clamping grooves, the clamping grooves of the two clamping blocks are matched to form a clamping hole for clamping the infusion bag or the infusion needle, and the clamping hole is matched with the shape of the clamping end of the infusion bag or the infusion needle.

4. The infusion connector clip according to claim 3, wherein the inner wall of said notch is provided with an elastic layer.

5. The infusion coupling clip of claim 2, wherein the two clamping pieces are magnetically attracted members having opposite magnetic poles.

6. The infusion connection clamp according to claim 2, wherein the two clamping blocks are a first clamping block and a second clamping block respectively, a buckle is arranged on one side of the first clamping block close to the second clamping block, a clamping hole is correspondingly arranged on the second clamping block, and the buckle is in clamping fit with the clamping hole so as to maintain the clamping piece in the closed state.

7. The infusion connection clip as claimed in claim 6, wherein the clip comprises a spring piece and a clip block, the clip block is used for matching with the clip hole, and the clip block is arranged on the first clip block through the spring piece; the second clamping block is provided with a guide inclined plane which is used for guiding the clamping block to enter the clamping hole;

when the clamping block moves towards the clamping hole along the guide inclined surface, the elastic sheet can be extruded to rotate so as to accumulate elastic potential energy, and the elastic potential energy is used for driving the elastic sheet to reset when the buckle enters the clamping hole so that the clamping block is clamped in the clamping hole.

8. The infusion connecting clamp as claimed in claim 7, wherein an unlocking rod is arranged on the second clamping block, an unlocking hole communicated with the outside is formed in the side wall of the clamping hole in the second clamping block, the unlocking rod is slidably arranged in the unlocking hole, and the unlocking rod is used for applying thrust to the clamping block in the clamping hole so as to separate the clamping block from the clamping hole.

9. The infusion connection clip as claimed in claim 8, wherein a button for pushing the unlocking lever is disposed on an end of the unlocking lever away from the second clamping block, an installation groove for installing the button is disposed on a side of the second clamping block away from the clamping hole, the button is slidably disposed in the installation groove, and at least a portion of the button protrudes out of the installation groove.

10. The infusion connecting clamp as claimed in claim 1, wherein the connecting rod comprises an inner tube, an outer tube and a locking member, and the ends of the inner tube and the outer tube opposite to each other are respectively connected with the two clamping members; the outer tube is provided with a sliding cavity extending along the axial direction of the outer tube, and the inner tube is arranged in the sliding cavity in a penetrating mode and can move along the axial direction of the sliding cavity; the retaining member is in threaded fit with the outer pipe, and one end of the retaining member can extend into the sliding cavity to limit the inner pipe to move along the axial direction of the inner pipe.