CN117563113A - Push rod adjusting mechanism and balloon catheter thereof - Google Patents

Abstract

The application discloses a push rod adjusting mechanism and a balloon catheter thereof; the push rod adjusting mechanism comprises a shell, a push rod body, an elastic piece and a sealing piece; the inside of the shell is provided with a containing cavity, one end of the containing cavity is provided with a connecting port, and the side face of the containing cavity is provided with an opening; the push rod body is axially and movably connected in the accommodating cavity, and one end, close to the connecting port, of the push rod body extends into the catheter body; the sealing piece is arranged on the push rod body and is axially connected with the accommodating cavity in a sliding manner, and a filling cavity is formed by the sealing piece, the accommodating cavity and the push rod body in an enclosing manner; the elastic piece is arranged in the accommodating cavity and forces the push rod body or the sealing piece to move towards the direction close to the connecting port. The saccule catheter comprises a catheter body, a saccule body, a handle and a push rod adjusting mechanism, wherein the shell is arranged inside the handle, and a pipe interface is arranged on the handle. The push rod adjusting mechanism and the balloon catheter thereof are simple to operate and control and high in safety.

Description

Push rod adjusting mechanism and balloon catheter thereof

Technical Field

The application relates to the technical field of medical instruments, in particular to a push rod adjusting mechanism and a balloon catheter thereof.

Background

Catheters are medical tubes that are inserted into the body for examination and therapy, while balloon catheters are catheters that have a balloon that can be inflated in the body, and inflated by inflation of the balloon to perform a specific therapy or examination task, and then depressurized and retracted. Balloon catheters are widely used in medical fields in recent years, such as vascular intervention, digestive tract treatment, urinary system treatment, cardiac catheter examination, etc., and when using a balloon, careful handling is required to avoid causing discomfort or injury to the patient.

The balloon expansion and contraction which is common at present is controlled by a pressure pump or a push rod, and the pressure pump control is to expand and contract the balloon by inflating, pressurizing, evacuating and decompressing the balloon; push rod control is typically achieved by manually or electrically operating a push-pull device within the handle to push and pull the balloon body to control the deformation of the balloon.

However, in certain treatments or examinations where safety requirements are very high, such as cardiac examinations using balloon catheters, if the deformation of the balloon is controlled by means of inflation pressure, the gas will enter the heart once the balloon has ruptured, with very serious consequences. The deformation of the air bag is controlled by manually controlling the push-pull device in the handle, a doctor is required to hold the handle for operation, and the doctor must strictly follow the operation standard, and the examination or treatment effect is seriously affected due to uncertainty of manual operation, such as the falling of the handle or untimely operation; when the electric control is adopted, an automatic control mode of the electric control telescopic rod is required to be adopted, namely, the electric control is more limited, and the possibility of accidents is higher.

Therefore, how to improve the existing balloon catheter to overcome the above-mentioned shortcomings is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

An object of the present application is to provide a push rod adjusting mechanism and balloon catheter thereof that is simple to operate and control and has high safety.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows: a push rod adjusting mechanism comprises a shell, a push rod body, an elastic piece and a sealing piece; the inside of the shell is provided with a containing cavity, one end of the containing cavity is provided with a connecting port for communicating the catheter body in a penetrating way, and the side surface of the containing cavity is provided with an opening in a penetrating way; the push rod body is axially and movably connected in the accommodating cavity, and one end, close to the connecting port, of the push rod body extends into the catheter body; the sealing piece is arranged on the push rod body, the sealing piece is axially connected with the accommodating cavity in a sliding manner, and a filling cavity for communicating the opening is formed among the sealing piece, the accommodating cavity and the push rod body in a surrounding manner; the elastic piece is arranged in the accommodating cavity and is used for forcing the push rod body or the sealing piece to move towards the direction close to the connecting port.

Preferably, a channel is formed between the outer wall of the push rod body and the inner wall of the catheter body, and the channel is used for communicating the filling cavity and the balloon body at the distal end of the catheter body.

Preferably, one end of the accommodating cavity, which is far away from the connecting port, penetrates through the shell, and a stop block is arranged at one end of the shell, which is far away from the connecting port; the elastic piece is a spring, the spring is sleeved on the push rod body, and the spring is located between the sealing piece and the stop block.

Preferably, at least one blocking piece is arranged between the spring and the sealing element and/or between the spring and the stop block.

Preferably, the shell comprises a first section body, a second section body and a sealing cap; the sealing cap is in threaded connection with one end of the first section body, and the second section body is spliced with the other end of the first section body; the opening is formed in the first section body, the connecting port is formed in the sealing cap, and the accommodating cavity is formed in the first section body and the second section body.

The application also provides a sacculus pipe, including the pipe body, set up in the sacculus body of pipe body distal end, set up in the handle of pipe body proximal end and push rod adjustment mechanism, the casing on the push rod adjustment mechanism is located inside the handle, be equipped with on the handle and be used for the intercommunication the open-ended pipe interface on the casing.

Preferably, physiological saline is suitable for being introduced into the tube interface; the balloon body is communicated with the filling cavity through a channel, a liquid outlet is formed in the balloon body in a penetrating mode, and the caliber of the liquid outlet is smaller than or equal to that of the pipe joint.

Preferably, the balloon catheter further comprises a suction device for communicating with the tube interface.

Preferably, the handle, the baffle plate and the baffle block are provided with a abdication hole in a penetrating way at the position corresponding to the catheter body.

Preferably, the handle is internally provided with a mounting groove, a first clamping groove and a second clamping groove; the first section body and the second section body on the shell are embedded in the mounting groove, the clamping blocks on the outer wall of the first section body are clamped in the first clamping groove, and the stop block which is positioned on the shell and far away from one end of the connecting port is clamped in the second clamping groove.

Compared with the prior art, the beneficial effect of this application lies in: (1) When the push rod adjusting mechanism is used, the sealing element, the accommodating cavity and the push rod body enclose a filling cavity for communicating the opening, and the elastic element is used for forcing the push rod body or the sealing element to move towards the direction close to the connecting port, so that when gas or liquid is not injected into the filling cavity through the opening, the sealing element and the push rod body are positioned at the initial position, at the moment, one end of the push rod body positioned inside the catheter body stretches into the balloon body and pushes and pulls the balloon body into an elongated state towards the direction far away from the catheter body, and the balloon body is more conveniently inserted into the appointed position of a human body.

(2) After the balloon body is inserted into the appointed position of the human body, gas or liquid is injected into the filling cavity through the opening, and the gas or liquid can squeeze the sealing piece, so that the sealing piece and the push rod body slide in a direction away from the connecting port. When the front end of the push rod body is fixed at the front end of the balloon body, the push rod body slides in the direction away from the connecting port to pull the front end of the balloon body to move backwards, so that the balloon body is deformed, and the balloon body can be inflated.

(3) When the gas or liquid in the filling cavity is gradually discharged through the opening, the sealing element and the push rod body slide towards the direction close to the connecting port (namely the push rod body automatically resets) under the action of the elastic element, so that the balloon body is automatically deformed into a slender state gradually, and the retracting operation is facilitated; moreover, the automatic resetting of the push rod body can ensure that the balloon body is in a slender state during the retracting operation, and the balloon body is prevented from being retracted in a folded state due to the forgetting of the resetting operation of the push rod body.

(4) The push rod adjusting mechanism can control the movement of the push rod body only by controlling the air charging and discharging or the liquid charging and discharging to the opening, and is simple to operate and control and high in safety. The beneficial effects of the balloon catheter are the same as those of the push rod adjusting mechanism, and detailed description thereof is omitted.

Drawings

Fig. 1 is a perspective view of a push rod adjusting mechanism provided in the present application.

Fig. 2 is a front view of the push rod adjustment mechanism of fig. 1 provided herein.

Fig. 3 is a cross-sectional view taken along A-A in fig. 2 provided herein.

Fig. 4 is an enlarged view of the various structures provided herein at the top of the push rod adjustment mechanism of fig. 3.

Fig. 5 is a partial enlarged view of I in fig. 4 provided herein.

Fig. 6 is an enlarged view of the various structures provided herein at the bottom of the push rod adjustment mechanism of fig. 3.

Fig. 7 is a partial block diagram of a balloon catheter provided herein.

In the figure: 1. a push rod adjusting mechanism; 11. a housing; 111. a first segment; 1111. an opening; 1112. a clamping block; 112. a second segment; 1121. a groove; 113. a sealing cap; 12. a push rod body; 13. an elastic member; 14. a seal; 15. a baffle; 16. a stop block; 161. a relief hole; 2. a catheter body; 3. a handle; 31. a mounting groove; 32. a first clamping groove; 33. a second clamping groove; 34. a limit groove; 35. a retainer; 100. filling the cavity; 200. a channel.

Detailed Description

The present application will be further described with reference to the specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present application, it should be noted that, for the azimuth terms such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific protection scope of the present application that the device or element referred to must have a specific azimuth configuration and operation, as indicated or implied. The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises" and "comprising," along with any variations thereof, in the description and claims of the present application are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a push rod adjusting mechanism 1 including a housing 11, a push rod body 12, an elastic member 13, and a sealing member 14; the housing 11 is internally provided with a containing cavity, one end of the containing cavity is penetrated with a connecting port for communicating the catheter body 2, and the side surface of the containing cavity is penetrated with an opening 1111; the push rod body 12 is axially movably connected in the accommodating cavity, and one end, close to the connecting port, of the push rod body 12 extends into the catheter body 2; the sealing element 14 is arranged on the push rod body 12, the sealing element 14 is axially and slidably connected with the accommodating cavity, and a filling cavity 100 used for communicating an opening 1111 is enclosed among the sealing element 14, the accommodating cavity and the push rod body 12; the elastic element 13 is disposed in the accommodating cavity, and the elastic element 13 is used for forcing the push rod body 12 or the sealing element 14 to move in a direction approaching to the connecting port.

As shown in fig. 4, the push rod adjusting mechanism 1 operates on the principle that: (1) When gas or liquid is not injected into the filling cavity 100 through the opening 1111, the sealing member 14 and the push rod body 12 are at the initial position, at this time, one end of the push rod body 12 located inside the catheter body 2 extends into the balloon body and pushes and pulls the balloon body in a direction away from the catheter body 2 to be in an elongated state, so that the balloon body can be more conveniently inserted into a designated position of a human body.

(2) After the balloon body is inserted into the designated position of the human body, gas or liquid is injected into the filling chamber 100 through the opening 1111, and the gas or liquid presses the sealing member 14, so that the sealing member 14 and the pusher body 12 slide in a direction away from the connection port. When the front end of the push rod body 12 (i.e., the end of the push rod body 12 located inside the balloon body) is fixed at the front end of the balloon body, sliding the push rod body 12 away from the connection port pulls the front end of the balloon body to move backward, so that the balloon body is deformed. When the balloon body is filled with gas or liquid by the prior art (additional lumen in the catheter) or the channel 200, the balloon body is fully inflated.

(3) When the gas or liquid in the filling cavity 100 is gradually discharged through the opening 1111, the sealing member 14 and the push rod body 12 slide in a direction approaching to the connection port (i.e. the push rod body 12 automatically resets) under the action of the elastic member 13, so that the balloon body is automatically deformed into a slender state, and the retracting operation is facilitated; moreover, such automatic return of the pusher body 12 can ensure that the balloon body is in an elongated state during the retracting operation, and avoid the balloon body from being retracted in a folded state (i.e., in a folded state in the front-rear direction) due to forgetting the return operation of the pusher body 12.

To sum up, the present application can control the movement of the push rod body 12 by only controlling the air filling and discharging or the air filling and discharging to the opening 1111, and the operation is simple and the safety is high.

It should be appreciated that in the above-described arrangement, the filling chamber 100 is not in communication with the balloon body, i.e. at least a region between the outer wall of the pusher body 12 and the inner wall of the catheter body 2 forms a seal, thereby preventing gas or liquid within the filling chamber 100 from entering the balloon body.

It should be understood that, the specific structure and the mounting manner of the elastic member 13 are not limited in this application, and only one specific structure is provided below for reference, as shown in fig. 3, 4 and 6, in some embodiments of the present application, one end of the accommodating cavity away from the connection port penetrates the housing 11, and one end of the housing 11 away from the connection port is provided with the stop 16; the elastic member 13 is a spring, the spring is sleeved on the push rod body 12, and the spring is located between the sealing member 14 and the stop block 16.

Referring to fig. 3, 4 and 6, in some embodiments of the present application, a stop 15 is provided between the spring and the seal 14 or between the spring and the stop 16; of course, the stop 15 may also be provided between the spring and the seal 14 and between the spring and the stop 16. The retaining piece 15 can fix the spring, so that the acting force of the spring acts on the sealing element 14 more uniformly; on the other hand, by increasing or decreasing the number of the blocking pieces 15, the function of adjusting the initial elasticity of the spring can be achieved, and the universality is stronger.

Referring to fig. 1 to 3, in some embodiments of the present application, for convenience of manufacturing and assembly, the housing 11 includes a first segment 111, a second segment 112, and a sealing cap 113; the sealing cap 113 is in threaded connection with one end of the first section 111, and the second section 112 is spliced with the other end of the first section 111; an opening 1111 is formed in the first stage 111, a connection port is formed in the sealing cap 113, and a receiving chamber is formed inside the first stage 111 and the second stage 112.

Example two

The difference from the first embodiment is that, as shown in fig. 4 and 5, a passage 200 is formed between the outer wall of the pusher body 12 and the inner wall of the catheter body 2, the passage 200 being used to communicate the filling chamber 100 with the balloon body at the distal end of the catheter body 2. In actual use, before gas or liquid is not injected, the push rod body 12 deforms the balloon body into an elongated state so as to facilitate the insertion of the balloon body into a human body; after the balloon body is inserted into the designated position, a certain amount of gas or liquid is injected into the filling cavity 100 through the opening 1111, at this time, because the size of the channel 200 is far smaller than that of the opening 1111, the gas or liquid entering the filling cavity 100 cannot enter the balloon body through the channel 200 quickly, i.e. the gas or liquid entering the filling cavity 100 forces the sealing member 14 and the push rod body 12 to slide in a direction away from the connection port, and the gas or liquid in the filling cavity 100 gradually enters the balloon body through the channel 200, so that the balloon body is gradually inflated and filled, and the use requirement of treatment or diagnosis is further met; when gas or liquid is exhausted through opening 1111, the balloon body is gradually contracted. That is, the control of the movement of the pusher body 12 and the control of the expansion or contraction of the balloon body can be simultaneously achieved by the gas or liquid injected into the filling chamber 100 under the action of the passage 200.

It should be appreciated that after the injection of a quantity of gas or liquid into the filling chamber 100, the gas or liquid will first force the elastic member 13 to compress without the balloon body immediately expanding and filling, thereby avoiding the increase in discomfort due to the balloon body expanding response being too fast. Otherwise, if the elastic member 13 is not used, the balloon body will be inflated immediately after the gas or liquid is injected (i.e. the inflation response is too fast), and the discomfort of the patient will be increased due to the too fast inflation response of the balloon body.

It should be noted that, in the second embodiment, when the gas or liquid is discharged due to improper operation or equipment failure, the balloon body is contracted, and at most, the balloon body is gradually deformed into an elongated state, so that the risk of rupture is avoided, and the safety is high; when excessive gas or liquid is injected due to improper operation or equipment failure or continuous injection, the elastic member 13 also causes the guide sealing member 14 and the push rod body 12 to slide in a direction away from the connection port, which corresponds to increasing the space of the filling cavity 100, so that the relative stability of the pressure inside the filling cavity 100 and the balloon body can be maintained, and the risk of rupture of the balloon body can be prevented, thereby having high safety.

It should be noted that the push rod adjusting mechanism 1 described above may be applied to a balloon catheter, but is not limited to the balloon catheter, and only one specific embodiment (see embodiment three) applied to the balloon catheter is provided in detail below.

Example III

Referring to fig. 1 to 7, the present embodiment provides a balloon catheter, which comprises a catheter body 2, a balloon body (not shown in the drawings) disposed at the distal end of the catheter body 2, a handle 3 disposed at the proximal end of the catheter body 2, and a push rod adjusting mechanism 1, wherein a housing 11 on the push rod adjusting mechanism 1 is disposed inside the handle 3, and a tube connector for communicating with an opening 1111 on the housing 11 is disposed on the handle 3. Gas or liquid may be injected into opening 1111 (i.e., filling chamber 100) through the tube interface. The specific working principle is the same as that of the first embodiment or the second embodiment, and detailed description thereof is omitted.

In some embodiments of the present application, physiological saline is preferably passed into the tube connector; meanwhile, the balloon body is communicated with the filling cavity 100 through the channel 200, a liquid outlet is arranged on the balloon body in a penetrating mode, and the caliber of the liquid outlet is smaller than or equal to that of the pipe joint. When in actual use, physiological saline is slowly injected into the tube interface (namely, the injected physiological saline can be quickly discharged into the channel 200, namely, the pressure of the injected physiological saline can not force the elastic piece 13 to generate compression), so that the physiological saline fills the filling cavity 100, the channel 200 and the balloon body in the slender state, thereby evacuating the gas in the balloon body; then, the air sac body is inserted into a designated position of a human body, and the injection or continuous injection of the physiological saline can be stopped in the insertion process (if the injection is continuous, the injection amount of the physiological saline is kept to be equal to the amount of the physiological saline discharged from the liquid outlet); after the balloon body is inserted into the designated position, the injection amount of the normal saline is increased, and the normal saline can not be discharged into the channel 200 rapidly in the same way, so that the elastic piece 13 is compressed, the sealing piece 14 and the push rod body 12 slide in the direction away from the connecting port, and discomfort caused by too fast expansion response of the balloon body is avoided; after the balloon body is stabilized for a period of time, physiological saline gradually enters the balloon body through the channel 200, so that the balloon body is gradually inflated and filled, and the diagnosis or treatment purpose is finished; when the normal saline is discharged through the tube connector, the sealing member 14 and the push rod body 12 slide again in a direction approaching the tube connector under the action of the elastic member 13, so that the balloon body is gradually contracted and finally restored to an elongated state, thereby facilitating the retracting operation. In addition, in the expansion process of the balloon body, the normal saline can be continuously discharged from the liquid outlet, so that the hydraulic pressure is continuously reduced, the expansion process of the balloon body is slower, and the comfort is further improved; of course, the continuous pressure relief (namely, the slow discharge of the physiological saline) can also prevent the balloon body from instantaneously discharging a large amount of physiological saline due to the rupture, so that the safety is higher.

In some embodiments of the present application, to facilitate injection or withdrawal of the liquid, the balloon catheter further comprises aspiration means (not shown in the drawings) for interfacing with the tube. The liquid can be pumped into the filling chamber 100 by suction means on the one hand and the liquid in the filling chamber 100 can also be pumped out on the other hand. It should be noted that the suction device may be either an automatic suction device (e.g., a pump) or a manual suction device (e.g., a syringe).

Referring to fig. 6, in some embodiments of the present application, a relief hole 161 is formed through the handle 3, the baffle 15, and the stopper 16 at a position corresponding to the catheter body 2. When the push rod body 12 moves in a direction away from the connection port (i.e., close to the stopper 16), the push rod body 12 is inserted into the relief hole 161, so as to avoid interference. Otherwise, if the function of the relief hole 161 is not provided, enough space needs to be reserved between the push rod body 12 and the baffle 15, and at this time, the spring cannot be completely sleeved outside the push rod body 12, so that when the push rod body 12 moves in a direction approaching to the stop block 16, the end of the push rod body 12 is easy to incline through the spring.

Referring to fig. 7, in some embodiments of the present application, for ease of installation, the handle 3 is internally provided with a mounting groove 31, a first clamping groove 32, and a second clamping groove 33; the first section 111 and the second section 112 on the housing 11 are embedded in the mounting groove 31, the clamping block 1112 on the outer wall of the first section 111 is clamped in the first clamping groove 32, and the stop block 16 located at one end of the housing 11 far away from the connecting port is clamped in the second clamping groove 33. Similarly, the groove 1121 on the second section 112 is clamped on the bump in the handle 3.

Referring to fig. 7, in some embodiments of the present application, in order to maintain the straightness of the catheter body 2 inside the handle 3, a retainer 35 and a limiting groove 34 are provided in the handle 3, where the position on the catheter body 2 near the sealing cap 113 axially penetrates through the retainer 35, and the position on the catheter body 2 near the front end of the handle 3 is clamped in the limiting groove 34, so that the straightness of the catheter body 2 inside the handle 3 is improved through the retainer 35 and the limiting groove 34, so that the axes of the catheter body 2 and the part on the push rod body 12 near the sealing cap 113 are kept coincident with the axis of the push rod body 12 in the casing, thereby facilitating the relative movement of the push rod body 12 inside the catheter body 2 due to the bearing of the axial force.

The foregoing has outlined the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the present application is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of protection of the present application is defined by the appended claims and equivalents thereof.

Claims (10)

1. The push rod adjusting mechanism is characterized by comprising a shell, a push rod body, an elastic piece and a sealing piece; the inside of the shell is provided with a containing cavity, one end of the containing cavity is provided with a connecting port for communicating the catheter body in a penetrating way, and the side surface of the containing cavity is provided with an opening in a penetrating way; the push rod body is axially and movably connected in the accommodating cavity, and one end, close to the connecting port, of the push rod body extends into the catheter body; the sealing piece is arranged on the push rod body, the sealing piece is axially connected with the accommodating cavity in a sliding manner, and a filling cavity for communicating the opening is formed among the sealing piece, the accommodating cavity and the push rod body in a surrounding manner; the elastic piece is arranged in the accommodating cavity and is used for forcing the push rod body or the sealing piece to move towards the direction close to the connecting port.

2. The pusher adjustment mechanism of claim 1, wherein a channel is formed between an outer wall of the pusher body and an inner wall of the catheter body, the channel being for communicating the filling lumen and a balloon body distal of the catheter body.

3. The push rod adjusting mechanism according to claim 1, wherein one end of the accommodating cavity away from the connecting port penetrates through the shell, and a stop block is arranged at one end of the shell away from the connecting port;

the elastic piece is a spring, the spring is sleeved on the push rod body, and the spring is located between the sealing piece and the stop block.

4. A push rod adjustment mechanism according to claim 3, characterized in that at least one stop is provided between the spring and the seal and/or between the spring and the stop.

5. The pushrod adjustment mechanism of claim 1, wherein the housing includes a first segment, a second segment, and a sealing cap; the sealing cap is in threaded connection with one end of the first section body, and the second section body is spliced with the other end of the first section body; the opening is formed in the first section body, the connecting port is formed in the sealing cap, and the accommodating cavity is formed in the first section body and the second section body.

6. A balloon catheter comprises a catheter body, a balloon body arranged at the distal end of the catheter body and a handle arranged at the proximal end of the catheter body; a push rod adjustment mechanism according to any one of claims 1 to 5; the shell on the push rod adjusting mechanism is arranged inside the handle, and a pipe connector used for being communicated with an opening on the shell is arranged on the handle.

7. The balloon catheter of claim 6, wherein said tube port is adapted to be filled with saline; the balloon body is communicated with the filling cavity through a channel, a liquid outlet is formed in the balloon body in a penetrating mode, and the caliber of the liquid outlet is smaller than or equal to that of the pipe joint.

8. The balloon catheter of claim 6, further comprising a suction device for communicating with the tube interface.

9. The balloon catheter of claim 6, wherein the handle, the stop and the stop are provided with relief holes therethrough at positions corresponding to the catheter body.

10. The balloon catheter of claim 6, wherein the handle has a mounting slot, a first clamping slot, and a second clamping slot disposed therein; the first section body and the second section body on the shell are embedded in the mounting groove, the clamping blocks on the outer wall of the first section body are clamped in the first clamping grooves, and the stop blocks located on the shell and far away from one end of the connecting port are clamped in the second clamping grooves.