Device for detecting water content of blood in hemodialysis process

Abstract

The invention belongs to the technical field of detection accessories for hemodialysis, and provides a device for detecting the water content of blood in the hemodialysis process. The device for detecting the water content of blood in the hemodialysis process comprises a main shell, and the main shell comprises a mounting outer shell, a connecting pipe and an immersion inner shell; the immersion inner shell is provided with a liquid inlet hole; the liquid inlet part is mounted in the main shell and is positioned in the immersion inner shell; the liquid inlet part comprises a liquid suction air bag sleeve and a clamping piece; the control part comprises an external control operation part, and the external control operation part is used for controlling the immersion inner shell to move in the hemodialyzer and transferring the immersion inner shell to a detected area; the detection main body is mounted in the mounting shell of the main shell and is connected with the connecting pipe; and the detection main body is used for detecting the water content in the liquid discharged from the connecting pipe. The device can be used for effectively detecting the moisture concentration of liquid in the multi-cavity hemodialysis machine.

Description

Technical Field

[0001] The invention relates to the technical field of hemodialysis detection accessories, and in particular to a device for detecting blood water content during hemodialysis. Background Art

[0002] Traditional hemodialysis machines are used to detect the water content of blood. Usually, the detection accessories are placed directly into the container for detection. However, for the new multi-chamber hemodialysis device, this method cannot meet the needs and cannot effectively monitor the water content in the multi-chamber cavity. As a result, the blood content in the liquid entering the patient's body after dialysis is too much or too little.

[0003] Therefore, in order to check the water concentration of the liquid in the multi-chamber hemodialysis machine, we propose an apparatus for detecting the above water concentration. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a device for detecting the water content of blood during hemodialysis, so as to effectively detect the water concentration of liquid in a multi-chamber hemodialysis machine.

[0005] The present invention provides a blood water content detection device during hemodialysis, comprising: a main shell, the main shell comprising a mounting shell, a connecting tube and an immersion inner shell; one end of the connecting tube is in communication with the mounting shell, and the other end of the connecting tube is in communication with the immersion inner shell; the immersion inner shell is placed in a hemodialyzer; the immersion inner shell has a liquid inlet hole; a liquid inlet part, the liquid inlet part is installed in the main shell and located in the immersion inner shell; the liquid inlet part comprises a liquid absorbing airbag sleeve and a clamping member; one end of the liquid absorbing airbag sleeve is fixedly installed in the At the liquid inlet hole of the immersed inner shell; the other end of the liquid absorbing airbag sleeve is connected to one end of the connecting tube; the clamping member is installed in the immersed inner shell, and one end is used to clamp the liquid absorbing airbag sleeve; the control part, the control part includes an external control operating member, the external control operating member is used to control the movement of the immersed inner shell in the hemodialyzer and transport it to the detected area; and a detection body, the detection body is installed in the mounting shell of the main shell and connected to the connecting tube; the detection body is used to detect the water content in the liquid coming out of the connecting tube.

[0006] Furthermore, the liquid inlet part also includes a suction pump and a suction tube. The liquid suction airbag sleeve has a through hole. The suction pump is fixedly mounted on the mounting shell, and one end of the suction pump is connected to one end of the suction tube; the other end of the suction tube is connected to the liquid suction airbag sleeve through the through hole; the other end of the suction pump is connected to an external air source. In actual use, the purpose of this design is to facilitate the expansion and contraction of the liquid suction airbag sleeve, so that it is convenient for subsequent extraction of liquid and testing. In actual use, the principle of this work is simple, and the expansion and contraction of the above-mentioned liquid suction airbag sleeve is achieved by inflation and deflation. In this way, the liquid pumping method can be realized, which is convenient for subsequent work, wherein the suction tube can pass through a side wall of the connecting tube to communicate with the external air source.

[0007] Furthermore, the liquid absorbing airbag sleeve also has a flexible telescopic section, and the flexible telescopic section is arranged at one end of the liquid absorbing airbag sleeve. In actual use, this design is used in conjunction with the above-mentioned suction pump. In actual work, the purpose of this design is to achieve the closure of the liquid absorbing airbag sleeve through the expansion of the flexible telescopic section. In this way, it is convenient to absorb the liquid of the liquid absorbing airbag sleeve in the subsequent detection subject, so as not to affect other parts, and reduce the impact on the liquid in the multiple chambers during the detection process of the detection subject.

[0008] Furthermore, the liquid suction airbag sleeve also has a liquid isolation sleeve plate, which is arranged in the liquid suction airbag sleeve, and one end of the liquid isolation sleeve plate is fixedly connected to the liquid suction airbag sleeve, and the other end of the liquid isolation sleeve plate is close to the direction of the flexible telescopic section. In actual use, the purpose of this design is to facilitate the airflow generated by the above-mentioned suction pump, thereby realizing the impact on the above-mentioned flexible telescopic section, and then facilitating the expansion and expansion of the flexible telescopic section. In actual design, the flexible telescopic section is made of medical silicone material that is easy to deform. Moreover, through the coordinated use of the liquid-isolating sleeve and the flexible telescopic section, the expansion, expansion and contraction states of the flexible telescopic section are realized. This method, with reference to the working method of the anus in the human body, realizes airtightness. In this way, during the process of collecting liquid, the immersion inner shell can be immersed in the liquid first, and then the flexible telescopic section can be expanded and abutted to form a closing effect, which is similar to the anus closure. Finally, the liquid entering the back suction airbag sleeve is extracted and tested through the pump components in the detection body. In this way, data can be effectively obtained while reducing the influence of liquid flow on the hemodialysis process.

[0009] Furthermore, the clamping member includes a clamping cylinder and a clamping finger, one end of the clamping cylinder is fixedly mounted on the inner wall of the immersed inner shell, and the other end of the clamping cylinder is connected to the clamping finger; the clamping finger is mounted on the liquid absorbing airbag sleeve and is used to squeeze the liquid absorbing airbag sleeve. In actual use, the purpose of this design is to facilitate squeezing the liquid absorbing airbag sleeve and then form an exhaust effect, so that the gas in the liquid absorbing airbag sleeve can be reduced, and then the gas inside the immersed inner shell can be reduced, so that the immersed inner shell can be raised and lowered in the liquid, so that it is convenient for the immersed inner shell to enter the required area.

[0010] Furthermore, the clamping fingers include connecting fingers, and the connecting fingers are provided with four, and the four connecting fingers are connected front and back to form a rectangle; and the connecting fingers are hinged front and back; wherein one side of the connecting fingers abuts against the liquid absorbing airbag sleeve. In actual use, the purpose of this design is to facilitate the discharge of gas at the liquid absorbing airbag sleeve, that is, the gas at both ends of the flexible telescopic section, so that it is convenient to immerse the inner shell into the required area.

[0011] Furthermore, the clamping finger also includes a control finger, and the clamping cylinder is provided with two fingers; wherein the control finger is provided with two fingers, which are arranged opposite to each other, and one end is installed at the hinge of the connecting finger; the output shaft of the clamping cylinder is connected to the other end of the control finger. In actual use, the purpose of this design is to facilitate the movement of the above four connecting fingers and realize their abutment and separation with the liquid suction airbag sleeve, so that it can be conveniently controlled. The clamping cylinder is an electric cylinder, so this design is more convenient to control.

[0012] Furthermore, the immersion inner shell is also provided with an external mounting cavity, and the external mounting cavity is provided in multiple locations and is evenly distributed on the outer wall of the immersion inner shell; the control part also includes a spring and an abutment slider; one end of the spring is fixedly installed in the external mounting cavity, the other end of the spring is connected to one side of the abutment slider, and the abutment slider is slidably installed in the external mounting cavity.

[0013] Furthermore, the control unit also includes a magnetic block, which is fixedly mounted on the other side of the abutting slider, and the magnetic block is magnetically connected to the external control operating member. In actual use, the method adopted by this design is to generate bubbles through the movement of the spring in its outer mounting cavity and the abutting slider when the immersed inner shell moves in the hemodialyzer, and the bubbles are coated on the outer surface of the immersed inner shell, so that the immersed inner shell is protected during the movement, and on the other hand, the magnetic block in this design is magnetically connected to the external control operating member; and the magnetic block is fixedly mounted on the surface of the abutting slider, so that the abutting slider can slide effectively in the outer mounting cavity, and then in the sliding process of the abutting slider, bubbles are generated, so that the outer surface of the immersed inner shell is coated with air bags, which can effectively reduce the influence of the liquid on the immersed inner shell.

[0014] It can be seen from the above technical solution that the beneficial effects of the blood water content detection device during hemodialysis provided by the present invention are as follows;

[0015] (1) In actual use, the design uses the pump components in the detection body to draw blood into the hemodialysis instrument for detection. In this way, the water content of the blood after dialysis can be effectively detected;

[0016] (2) At the same time, the design uses the liquid-absorbing airbag sleeve and the clamping piece at the liquid inlet portion, and the liquid-absorbing airbag sleeve is used for sampling detection during the detection process. The design of the clamping piece is to facilitate the discharge of the gas at the liquid-absorbing airbag sleeve immersed in the inner shell, so that the immersed inner shell can be easily moved in the dialyzer;

[0017] (3) The immersion inner shell is operated by the external control operating member of the control unit to complete the movement of the immersion inner shell in the dialyzer, thereby ensuring effective detection of the dialyzer in the chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for the specific embodiments or the prior art description. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0019] Figure 1 A schematic front view of a device for detecting water content in blood during hemodialysis provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the installation structure of a blood water content detection device immersed in an inner shell during hemodialysis provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 2The schematic diagram of the operation of the air bag sleeve immersed in the inner shell and then abutting and closing after being inflated is shown;

[0022] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure of AA shown;

[0023] Figure 5 A schematic diagram of the control of an external control operating member on an immersed inner shell in a blood water content detection device during hemodialysis provided by an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a blood water content detection device placed during hemodialysis provided by an embodiment of the present invention.

[0025] Reference numerals:

[0026] Main shell 1, mounting shell 11, connecting tube 12, immersed inner shell 13, liquid inlet hole 131, outer mounting cavity 132, liquid inlet part 2, liquid suction airbag sleeve 21, through hole 211, flexible telescopic section 212, liquid isolation sleeve 213, clamping part 22, clamping cylinder 221, clamping finger 222, connecting finger 2221, control finger 2222, suction pump 23, suction tube 24, control part 3, external control operating part 31, spring 32, abutting slider 33, magnetic block 34, electromagnetic block 301, outer shell 302, detection body 4. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0028] The embodiment is basically as shown in the attached Figures 1 to 6 As shown:

[0029] like Figure 1 - Figure 6 As shown, the blood water content detection device during hemodialysis provided in this embodiment can effectively detect the water concentration of the liquid in a multi-chamber hemodialysis machine.

[0030] A blood water content detection device during hemodialysis in the present invention comprises: a main shell 1, wherein the main shell 1 comprises an installation shell 11, a connecting tube 12 and an immersion inner shell 13; one end of the connecting tube 12 is communicated with the installation shell 11, and the other end of the connecting tube 12 is communicated with the immersion inner shell 13; the immersion inner shell 13 is placed in the hemodialyzer; the immersion inner shell 13 has a liquid inlet hole 131; a liquid inlet part 2, wherein the liquid inlet part 2 is installed in the main shell 1 and is located in the immersion inner shell 13; the liquid inlet part 2 comprises a liquid absorbing airbag sleeve 21 and a clamping member 22; one end of the liquid absorbing airbag sleeve 21 is fixedly installed in the The liquid inlet hole 131 of the immersed inner shell 13; the other end of the liquid absorbing airbag sleeve 21 is connected to one end of the connecting tube 12; the clamping member 22 is installed in the immersed inner shell 13, and one end is used to clamp the liquid absorbing airbag sleeve 21; the control part 3, the control part 3 includes an external control operating member 31, the external control operating member 31 is used to control the movement of the immersed inner shell 13 in the hemodialyzer, and transport it to the detected area; and the detection body 4, the detection body 4 is installed in the mounting shell 11 of the main shell 1, and is connected to the connecting tube 12; the detection body 4 is used to detect the water content in the liquid coming out of the connecting tube 12. In actual use, the design draws blood into the hemodialysis instrument for testing through the pump components in the detection body 4, so that the water content of the blood after dialysis can be effectively tested; at the same time, the design uses the liquid suction airbag sleeve 21 and the clamping member 22 of the liquid inlet part 2, and the liquid suction airbag sleeve 21 is used for sampling detection during the detection process. The design of the clamping member 22 is to facilitate the discharge of the gas at the liquid suction airbag sleeve 21 in the immersed inner shell 13, so that the movement of the immersed inner shell 13 in the dialyzer can be facilitated; and the immersed inner shell 13 is operated through the external control operating member 31 of the control part 3 to complete the movement of the immersed inner shell 13 in the dialyzer, so that effective detection of the dialyzer in the multi-chamber can be guaranteed.

[0031] In order to facilitate the control of the liquid suction airbag sleeve 21, in this embodiment, the liquid inlet part 2 also includes a suction pump 23 and a suction tube 24. The liquid suction airbag sleeve 21 has a through hole 211. The suction pump 23 is fixedly mounted on the mounting shell 11, and one end of the suction pump 23 is connected to one end of the suction tube 24; the other end of the suction tube 24 is connected to the liquid suction airbag sleeve 21 through the through hole 211; the other end of the suction pump 23 is connected to an external air source. In actual use, the purpose of this design is to facilitate the expansion and contraction of the liquid suction airbag sleeve 21, so that it is convenient for the subsequent extraction of liquid and testing. In actual use, the principle of this work is simple. The expansion and contraction of the above-mentioned liquid suction airbag sleeve 21 is achieved by the inflation and deflation method. In this way, the liquid pumping method can be achieved, which is convenient for subsequent work.

[0032] In this embodiment, in order to further facilitate the extraction of the test liquid and reduce the influence on the flow of the liquid, the liquid suction airbag sleeve 21 also has a flexible telescopic section 212, and the flexible telescopic section 212 is arranged at one end of the liquid suction airbag sleeve 21. In actual use, this design is used in conjunction with the above-mentioned suction pump 23. In actual work, the purpose of this design is to achieve the closure of the liquid suction airbag sleeve 21 through the expansion of the flexible telescopic section 212. In this way, it is convenient to absorb the liquid of the liquid suction airbag sleeve 21 in the subsequent detection body 4, so as not to affect other parts, and reduce the influence on the liquid in the multi-chamber during the detection process of the detection body 4.

[0033] At the same time, in order to facilitate the effective deformation of the flexible telescopic section 212 in the liquid-absorbing airbag sleeve 21, in this embodiment, the liquid-absorbing airbag sleeve 21 also has a liquid-isolating sleeve 213, which is arranged in the liquid-absorbing airbag sleeve 21, and one end of the liquid-isolating sleeve 213 is fixedly connected to the liquid-absorbing airbag sleeve 21, and the other end of the liquid-isolating sleeve 213 is close to the direction of the flexible telescopic section 212. In actual use, the purpose of this design is to facilitate the airflow generated by the above-mentioned suction pump 23, so as to achieve the impact on the above-mentioned flexible telescopic section 212, and then facilitate the expansion of the flexible telescopic section 212. In actual design, the flexible telescopic section 212 is made of medical silicone material that is easy to deform. Moreover, through the coordinated use of the liquid-isolating sleeve 213 and the flexible telescopic section 212, the expansion and contraction states of the flexible telescopic section 212 are realized. This method, with reference to the working method of the anus in the human body, realizes airtightness. In this way, during the process of collecting liquid, the immersion inner shell 13 can be immersed in the liquid first, and then the flexible telescopic section 212 is expanded and abutted, thus forming a closing effect, similar to the anus closure. Finally, the liquid entering the back suction airbag sleeve 21 is extracted and tested through the pump components in the detection body 4. In this way, it is possible to effectively obtain data while reducing the influence of liquid flow on the hemodialysis process.

[0034] In this embodiment, in order to facilitate the exhaust of gas or liquid, the clamping member 22 includes a clamping cylinder 221 and a clamping finger 222, one end of the clamping cylinder 221 is fixedly mounted on the inner wall of the immersed inner shell 13, and the other end of the clamping cylinder 221 is connected to the clamping finger 222; the clamping finger 222 is mounted on the liquid absorbing airbag sleeve 21 and is used to squeeze the liquid absorbing airbag sleeve 21. In actual use, the purpose of this design is to facilitate the squeezing of the liquid absorbing airbag sleeve 21, thereby forming an exhaust effect, so that the gas in the liquid absorbing airbag sleeve 21 can be reduced, and then the gas inside the immersed inner shell 13 can be reduced, so that the immersed inner shell 13 can be lifted and lowered in the liquid, so that the immersed inner shell 13 can enter the desired area.

[0035] In this embodiment, in order to facilitate the abutment of the liquid-absorbing airbag sleeve 21, the clamping finger 222 includes a connecting finger 2221, and the connecting finger 2221 is provided with four, and the four connecting fingers 2221 are connected front and back to form a rectangle; and the connecting finger 2221 is hinged front and back; wherein one side of the connecting finger 2221 is abutted against the liquid-absorbing airbag sleeve 21. In actual use, the purpose of this design is to facilitate the discharge of gas at the liquid-absorbing airbag sleeve 21, that is, the gas at both ends of the flexible telescopic section 212, so that it is convenient to immerse the inner shell 13 into the required area. Further, in order to facilitate control, in this embodiment, the clamping finger 222 also includes a control finger 2222, and the clamping cylinder 221 is provided with two; wherein the control finger 2222 is provided with two, and is arranged oppositely, and one end is installed at the hinge of the connecting finger 2221; the output shaft of the clamping cylinder 221 is connected to the other end of the control finger 2222. In actual use, the purpose of this design is to facilitate the movement of the above-mentioned four connecting fingers 2221 and realize their abutment and separation with the liquid suction airbag sleeve 21. In this way, it can be easily controlled. The clamping cylinder 221 is an electric cylinder, so this design is more convenient to control.

[0036] In this embodiment, in order to protect the immersion inner shell 13, the immersion inner shell 13 is also provided with an outer mounting cavity 132, and the outer mounting cavity 132 is provided in multiple locations and is evenly distributed on the outer wall of the immersion inner shell 13; the control unit 3 also includes a spring 32 and an abutting slider 33; one end of the spring is fixedly installed in the outer mounting cavity 132, the other end of the spring 32 is connected to one side of the abutting slider 33, and the abutting slider is slidably installed in the outer mounting cavity 132. Further, in order to facilitate the protection of the immersion inner shell 13, in this embodiment, the control unit 3 also includes a magnetic block 34, the magnetic block 34 is fixedly installed on the other side of the abutting slider 33, and the magnetic block 34 is magnetically connected to the external control operating member. In actual use, the method adopted by this design is to generate bubbles through the movement of the spring 32 and the abutting slider 33 in its outer mounting cavity 132 when the immersed inner shell 13 moves in the hemodialyzer. The bubbles are coated on the outer surface of the immersed inner shell 13, so that the immersed inner shell 13 is protected during the movement. On the other hand, the magnetic block 34 in this design is magnetically connected to the external control operating member; and the magnetic block 34 is fixedly mounted on the surface of the abutting slider 33, so that the abutting slider 33 can be effectively slid in the outer mounting cavity 132, and then bubbles are generated during the sliding process of the abutting slider 33. In this way, the outer surface of the immersed inner shell 13 is coated with an air bag, which can effectively reduce the influence of the liquid on the immersed inner shell 13; and the generated air bag can effectively mark the location of the immersed inner shell 13. The external control operating member 31 is a combination of an electromagnetic block 301 and an outer shell 302. The electromagnetic block 301 is turned on, and the outer shell 302 is manipulated to transport the attracted immersed inner shell 13 to a desired area.

[0037] To sum up, this device for detecting the blood water content during hemodialysis is not only reasonably designed but also easy to operate. It can detect the blood water content of a multi-chamber hemodialysis instrument during the blood process. Therefore, the device is suitable for industry promotion.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A device for detecting blood water content during hemodialysis, characterized in that: include: A main shell, the main shell comprising a mounting shell, a connecting pipe and an immersion inner shell; one end of the connecting pipe is in communication with the mounting shell, and the other end of the connecting pipe is in communication with the immersion inner shell; the immersion inner shell is placed in the hemodialyzer; the immersion inner shell has a liquid inlet hole; A liquid inlet portion, the liquid inlet portion is installed in the main shell and is located in the immersion inner shell; the liquid inlet portion includes a liquid absorbing airbag sleeve and a clamping member; one end of the liquid absorbing airbag sleeve is fixedly installed at the liquid inlet hole of the immersion inner shell; the other end of the liquid absorbing airbag sleeve is connected to one end of the connecting pipe; the clamping member is installed in the immersion inner shell, and one end of the clamping member is used to clamp the liquid absorbing airbag sleeve; A control unit, the control unit comprising an external control operating member, the external control operating member being used to control the movement of the immersed inner shell in the hemodialyzer and transport it to the detected area; and A detection body is installed in the installation shell of the main shell and connected to the connecting pipe; the detection body is used to detect the water content in the liquid coming out of the connecting pipe.

2. The device for detecting blood water content during hemodialysis according to claim 1, characterized in that: The liquid inlet part also includes a suction pump and a suction tube. The liquid suction airbag sleeve has a through hole. The suction pump is fixedly installed on the mounting shell, and one end of the suction pump is connected to one end of the suction tube; the other end of the suction tube is connected to the liquid suction airbag sleeve through the through hole; the other end of the suction pump is connected to an external air source.

3. The device for detecting blood water content during hemodialysis according to claim 1, characterized in that: The liquid absorbing airbag sleeve also has a flexible telescopic section, and the flexible telescopic section is arranged at one end of the liquid absorbing airbag sleeve.

4. The device for detecting blood water content during hemodialysis according to claim 3, characterized in that: The liquid absorbing airbag cover also has a liquid isolating cover plate, which is arranged in the liquid absorbing airbag cover, and one end of the liquid isolating cover plate is fixedly connected to the liquid absorbing airbag cover, and the other end of the liquid isolating cover plate is close to the direction of the flexible telescopic section.

5. The device for detecting blood water content during hemodialysis according to claim 4, characterized in that: The clamping member comprises a clamping cylinder and clamping fingers, one end of the clamping cylinder is fixedly mounted on the inner wall of the immersed inner shell, and the other end of the clamping cylinder is connected to the clamping fingers; the clamping fingers are mounted on the liquid absorbing airbag sleeve and are used to squeeze the liquid absorbing airbag sleeve.

6. The device for detecting blood water content during hemodialysis according to claim 5, characterized in that: The clamping fingers include connecting fingers, four of which are connected front to back to form a rectangle; and the connecting fingers are hinged front to back; wherein one side of the connecting fingers abuts against the liquid absorbing airbag sleeve.

7. The device for detecting blood water content during hemodialysis according to claim 6, characterized in that: The clamping finger also includes a control finger, and the clamping cylinder is provided with two fingers; wherein the control finger is provided with two fingers, which are arranged opposite to each other, and one end is installed at the hinge of the connecting finger; the output shaft of the clamping cylinder is connected to the other end of the control finger.

8. The device for detecting blood water content during hemodialysis according to claim 6, characterized in that: The immersion inner shell is also provided with an outer mounting cavity, and the outer mounting cavity is provided in multiple locations and is evenly distributed on the outer wall of the immersion inner shell; the control part also includes a spring and an abutment slider; one end of the spring is fixedly installed in the outer mounting cavity, the other end of the spring is connected to one side of the abutment slider, and the abutment slider is slidably installed in the outer mounting cavity.

9. The device for detecting blood water content during hemodialysis according to claim 8, characterized in that: The control part further comprises a magnetic block, which is fixedly mounted on the other surface of the abutting sliding block and is magnetically connected to the external control operating member.

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