A hemodialysis catheter fixing device

Abstract

The present invention relates to the field of hemodialysis technology, and in particular to a hemodialysis catheter fixing device. The device comprises a fixing block, a shoulder strap is connected to the fixing block, one end of the shoulder strap is connected to a binding strap, a Velcro is arranged between the two ends of the binding strap, and the other end of the shoulder strap is connected to a slide buckle, which slides on the binding strap. The present invention fixes the patient's shoulders and abdomen respectively with the shoulder strap and the binding strap, and then clamps the catheter on the patient's neck into the rubber clamp. In this way, the catheter on the patient's neck can be fixed by the fixing method of the shoulder strap and the binding strap, which not only does not damage the patient's neck, but also is easy to operate. Afterwards, the port of the catheter can be closed by the cooperation of the closing frame, the movable frame, the limiting mechanism and the fixing mechanism, so as to protect the port of the catheter from being infected by external bacteria, and the movable frame only needs to be opened when it is used next time, so that the port of the catheter can be conveniently used by medical staff.

Description

Technical Field

[0001] The invention relates to the technical field of hemodialysis, and in particular to a hemodialysis catheter fixing device. Background Art

[0002] Hemodialysis is a treatment method used to treat patients with renal failure or acute kidney injury. It draws the patient's blood out of the body, passes it through a special filter (dialyzer) to remove waste and excess water from the blood, and then returns it to the body. This process requires the use of a hemodialysis catheter, which is a medical device inserted into a blood vessel to establish a connection with the extracorporeal circulation system. When performing hemodialysis, it is crucial to ensure the safe fixation of the catheter. Improper fixation may lead to complications such as catheter displacement, detachment or infection, which will not only interrupt the treatment process, but may also cause harm to the patient. Therefore, the development of an effective catheter fixation device is the key to improving dialysis safety and reducing the incidence of complications.

[0003] Patent publication number CN116350914A discloses a hemodialysis catheter fixing device; when in use, the patent needs to be fixed on the patient's neck for use, which not only increases the gravity borne by the patient's neck and easily causes damage to the patient's neck over a long period of time, but also mainly relies on the wrapping of the protective cover body when handling the catheter port, resulting in the need to unwrap the protective cover body little by little every time the catheter port needs to be used, which is very troublesome to operate, increases the workload of medical staff, and may also affect the timeliness and accuracy of treatment. Summary of the invention

[0004] In view of this, the present invention provides a hemodialysis catheter fixing device, which can solve the disadvantages of the existing hemodialysis catheter fixing device that, when in use, the device needs to be fixed on the patient's neck, which may easily cause damage to the patient's neck, and after the device wraps the port of the catheter, the protective cover body needs to be manually untied each time it is used, which is quite troublesome.

[0005] The technical solution is: a hemodialysis catheter fixing device, including a fixing block, a shoulder strap is connected to the fixing block, one end of the shoulder strap is connected to a strap, a Velcro is arranged between the two ends of the strap, the other end of the shoulder strap is connected to a slider, the slider slides on the strap, a locking mechanism is arranged in the slider, the locking mechanism is used to lock the slider on the strap, a rotating disk is rotatably arranged on the fixing block, a rubber clip for fixing the catheter is connected to the rotating disk, a limiting mechanism and a fixing mechanism are arranged in the fixing block, the limiting mechanism is used to limit the rotating disk, and the fixing mechanism is used to fix the limiting mechanism, a closing frame is installed on the rotating disk, a movable frame is rotatably arranged on the closing frame, and both the closing frame and the movable frame are used to close the port of the catheter.

[0006] Optionally, the locking mechanism includes a sliding frame, a fixing needle, a first spring and a first slider. The sliding frame is slidably arranged on the inner side of the slider. The fixing needles are connected to the sliding frame at intervals. The fixing needles are used to penetrate into the strap to lock the slider. The first spring is connected between the sliding frame and the inner side of the slider. The first slider is slidably arranged on the side of the slider. The first slider is used to squeeze the sliding frame to slide inside the slider.

[0007] Optionally, the limiting mechanism includes a second slider, a second spring and a rubber block. The second slider is slidably arranged on the side of the fixed block. A second spring is installed between the second slider and the inner side of the fixed block. The second slider is connected to the rubber block. The rubber block is located on the inner side of the fixed block, and the rubber block is used to limit the rotating disk.

[0008] Optionally, the fixing mechanism includes a movable rod, a third spring and a limit block. The movable rod is slidably arranged on the side of the fixed block. The third spring is installed between the movable rod and the inner side of the fixed block. The limit block is connected to the movable rod. The limit block is located on the inner side of the fixed block, and the limit block is used to block the rubber block to fix the rubber block.

[0009] Optionally, a magnetic plate is further included. The movable frame is mounted with the magnetic plate, and the magnetic plate is used to be adsorbed on the rotating disk to fix the movable frame in the open state.

[0010] Optionally, a disinfection mechanism is also included, which includes a power supply component, a connecting frame and an ultraviolet lamp. The power supply component is installed in the fixed block, and the closed frame and the movable frame are both connected to the connecting frame. The ultraviolet lamp is installed in the connecting frame. The ultraviolet lamp is used to disinfect the catheter, and the ultraviolet lamp is electrically connected to the power supply component.

[0011] Optionally, a contact switch is also included. The connection frame is connected to the contact switch. The power supply component and the ultraviolet lamp are electrically connected to the contact switch. The contact switch is used to control the switch of the ultraviolet lamp.

[0012] Optionally, a magnetic block is further included, and the connecting frame is connected to the magnetic block, so that the movable frame in the closed state is fixed by the attraction of the magnetic blocks on the connecting frame.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The present invention fixes the patient's shoulders and abdomen respectively with shoulder straps and binding straps, and then clamps the catheter on the patient's neck into the rubber clamp. In this way, the catheter on the patient's neck can be fixed by the fixing method of the shoulder straps and binding straps, which not only does not damage the patient's neck, but also is easy to operate. Afterwards, through the cooperation of the closing frame, the movable frame, the limiting mechanism and the fixing mechanism, the port of the catheter can be closed by the movable frame and the closing frame, thereby protecting the port of the catheter to prevent the port of the catheter from being infected by external bacteria, and when used next time, only the movable frame needs to be opened to facilitate medical staff to use the port of the catheter.

[0014] 2. The present invention provides a magnetic plate, which can be adsorbed on the rotating disk when the movable frame is reversed and opened, so as to fix the movable frame in the open state, thereby facilitating medical staff to operate the catheter in the closed frame.

[0015] 3. The present invention provides a disinfection mechanism so that the ultraviolet lamp can irradiate ultraviolet rays onto the catheter in the closed frame, thereby disinfecting the catheter so that the catheter can be used next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the strap, Velcro and slider of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the sliding frame, the first spring and the first sliding block of the present invention.

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the catheter of the present invention being fixed on the rubber clip.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the second sliding block, the rubber block and the movable rod of the present invention.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the limiting mechanism and the fixing mechanism of the present invention.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of the closed frame, movable frame and power supply assembly of the present invention.

[0024] Fig. 9 It is a three-dimensional structural schematic diagram of the magnetic plate, connection frame and contact switch of the present invention.

[0025] The meanings of the reference numerals in the figure are as follows: 1: fixing block, 101: catheter, 2: shoulder strap, 3: strap, 4: Velcro, 5: buckle, 601: sliding frame, 602: fixing pin, 603: first spring, 604: first slider, 7: rotating disk, 8: rubber clip, 901: second slider, 902: second spring, 903: rubber block, 1001: movable rod, 1002: third spring, 1003: limiting block, 11: closing frame, 12: movable frame, 13: magnetic plate, 14: power supply assembly, 15: connecting frame, 16: ultraviolet lamp tube, 17: contact switch, 18: magnetic block. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Embodiment: A hemodialysis catheter fixing device, see Figure 1-Figure 7As shown, it includes a fixing block 1; it also includes a shoulder strap 2, a strap 3, a Velcro 4, a slider 5, a rotating disk 7, a rubber clip 8, a closing frame 11, a movable frame 12, a locking mechanism, a limiting mechanism and a fixing mechanism; the rear side of the fixing block 1 is connected to the shoulder strap 2, and the shoulder strap 2 is used to be fixed to the patient's shoulder; one end of the shoulder strap 2 is connected to the strap 3, and the strap 3 is used to be fixed to the patient's abdomen; the Velcro 4 includes a male patch and a female patch, the male patch is connected to one end of the strap 3, and the female patch is connected to the other end of the strap 3, and the two ends of the strap 3 can be fixed by adhering the male patch to the female patch; the other end of the shoulder strap 2 is connected to the slider 5, and the slider 5 slides on the strap 3; a locking mechanism is arranged in the slider 5 , the locking mechanism is used to lock the slider 5 on the strap 3, so as to fix the position of the slider 5; a rotating disk 7 is rotatably provided on the front side of the fixed block 1, and the material of the rotating disk 7 is iron; a rubber clamp 8 for fixing the catheter 101 is connected to the front side of the rotating disk 7; a limiting mechanism and a fixing mechanism are provided in the fixed block 1, the limiting mechanism is used to limit the rotating disk 7, and the fixing mechanism is used to fix the limiting mechanism; a closing frame 11 is installed on the front side of the rotating disk 7, and a movable frame 12 is rotatably provided on the closing frame 11, and both the closing frame 11 and the movable frame 12 are used to close the port of the catheter 101, so as to protect the port of the catheter 101 to prevent the port of the catheter 101 from being infected by bacteria.

[0031] See also Figure 3 and Figure 4 As shown, the locking mechanism includes a sliding frame 601, a fixing needle 602, a first spring 603 and a first slider 604; a sliding frame 601 is slidably arranged on the inner front side of the slider 5; a fixing needle 602 is connected to the rear side of the sliding frame 601 at intervals, and the fixing needle 602 is used to penetrate into the strap 3 to lock the slider 5; a first spring 603 is connected between the front side of the sliding frame 601 and the inner front side of the slider 5; a first slider 604 is slidably arranged on the front side of the slider 5, and the first slider 604 is used to squeeze the sliding frame 601 to slide inside the slider 5, and a plurality of convex strips are arranged at intervals on the front side of the first slider 604, which can be moved by manually pushing the convex strips, so that the first slider 604 can be manually pushed to move.

[0032] See also Figure 6 and Figure 7 As shown, the limiting mechanism includes a second slider 901, a second spring 902 and a rubber block 903; the second slider 901 is slidably arranged on the left side of the fixed block 1; the second spring 902 is connected between the second slider 901 and the inner side of the fixed block 1; the rubber block 903 is connected to the right side of the second slider 901, the rubber block 903 is located on the inner side of the fixed block 1, and the rubber block 903 is in contact with the rotating disk 7, and the rubber block 903 limits the rotating disk 7 through friction.

[0033] See also Figure 6 and Figure 7As shown, the fixing mechanism includes a movable rod 1001, a third spring 1002 and a limit block 1003; the movable rod 1001 is slidably arranged on the upper left side of the fixed block 1; the third spring 1002 is installed between the movable rod 1001 and the inner side of the fixed block 1; the lower front part of the movable rod 1001 is connected to the limit block 1003, the limit block 1003 is located on the inner side of the fixed block 1, the left side of the limit block 1003 is an inclined surface, the right side of the limit block 1003 is a vertical surface, and the vertical surface of the limit block 1003 is used to block the rubber block 903 to fix the rubber block 903.

[0034] In the initial state, the vertical surface of the limit block 1003 clamps the rubber block 903 and the second sliding block 901, so that the second spring 902 is in a compressed state; When in use, the medical staff first ties the strap 3 to the patient's abdomen, then hangs the shoulder strap 2 on the patient's shoulder, and then fixes the two ends of the strap 3 with the Velcro 4, and then pulls the slider 5 to slide to the right on the strap 3 to adjust the position of the slider 5 on the strap 3 so that the slider 5 can pull the shoulder strap 2 tightly against the patient's shoulder, thereby preventing the shoulder strap 2 from falling off the patient's shoulder. After the position of the slider 5 on the strap 3 is adjusted, the first slider 604 is pushed to move to the left, so that the first slider 604 contacts the sliding frame 601, and the first slider 604 squeezes the sliding frame 601 and the fixing needle 602 to move backward, and the first spring 603 is compressed to allow the fixing needle 602 to pierce The movable rod 1001 is then pressed to move downward, and the third spring 1002 is compressed, so that the movable rod 1001 drives the limit block 1003 to move downward. When the vertical surface of the limit block 1003 is separated from the rubber block 903, the second spring 902 returns to its original state, and the second spring 902 drives the second slider 901 and the rubber block 903 to move left, so that the rubber block 903 is separated from the rotating disk 7. Then the movable rod 1001 is released, and the third spring 1002 is restored to its original state. The third spring 1002 drives the movable rod 1001 and the limit block 1003 to move upward and reset, and then the rotating disk 7 is twisted to rotate, thereby driving the rubber card The clamp 8 and the closing frame 11 are rotated to align the rubber clamp 8 with the catheter 101 on the patient's neck, and then the catheter 101 is clamped into the rubber clamp 8 for fixing, and the port of the catheter 101 is placed in the closing frame 11, and then the second slider 901 and the rubber block 903 are pushed to move rightward to reset, the second spring 902 is compressed, and when the rubber block 903 contacts the inclined surface of the limit block 1003, the rubber block 903 squeezes the limit block 1003 and the movable rod 1001 to move downward, the third spring 1002 is compressed, and when the rubber block 903 passes over the limit block 1003 and contacts the rotating disk 7, the third spring 1002 returns to its original state, and the third spring 1002 drives the movable rod 100 1 and the limit block 1003 move upward to reset, so that the vertical surface of the limit block 1003 contacts the rubber block 903, so that the limit block 1003 limits the rubber block 903, and the rubber block 903 contacts the rotating disk 7, so that the rubber block 903 can limit the rotating disk 7 by friction, and prevent the rotating disk 7 from rotating at will, and then pull the movable frame 12 to rotate and close, so that the movable frame 12 closes the port of the catheter 101 in the closing frame 11, so that the port of the catheter 101 can be protected to prevent the port of the catheter 101 from being infected by external bacteria, and the catheter 101 on the patient's neck can be fixed by the fixing method of the shoulder strap 2 and the strap 3; When the patient needs to undergo hemodialysis, the movable frame 12 can be pushed to reverse and open, and then the patient can be hemodialyzed using the catheter 101 in the closed frame 11. After the patient completes the hemodialysis, the movable frame 12 can be pulled to rotate and close. Afterwards, when it is no longer necessary to fix the catheter 101 on the patient's neck, push the movable frame 12 to reverse and open, then pull the catheter 101 out of the rubber clamp 8, and make the catheter 101 leave the closed frame 11, then push the first slider 604 to move right and reset, so that the first slider 604 is separated from the sliding frame 601, at this time the first spring 603 returns to its original state, the first spring 603 drives the sliding frame 601 and the fixing pin 602 to move forward and reset, so that the fixing pin 602 leaves the strap 3, thereby loosening the position of the slider 5 on the strap 3, and then pull the slider 5 to slide left on the strap 3, so that the slider 5 can pull the shoulder strap 2 to loosen from the patient's shoulder, and then use the Velcro 4 to untie the two ends of the strap 3, then remove the shoulder strap 2 from the patient's shoulder, and remove the strap 3 from the patient's abdomen, and finally clean and disinfect the closed frame 11 and the movable frame 12.

[0035] See also Fig. 9 As shown, a magnetic plate 13 is also included; a magnetic plate 13 is installed on the rear side of the movable frame 12, and the magnetic plate 13 is used to be adsorbed on the rotating disk 7 to fix the movable frame 12 in the open state.

[0036] By setting the magnetic plate 13, when the movable frame 12 is reversed to open, the magnetic plate 13 will follow the movable frame 12 to reverse, and when the magnetic plate 13 contacts the rotating disk 7, the magnetic plate 13 will be adsorbed on the rotating disk 7, so as to fix the movable frame 12 in the open state, thereby facilitating medical staff to operate the catheter 101 in the closed frame 11; when the movable frame 12 is rotated to close, the magnetic plate 13 will follow the movable frame 12 to rotate, so that the magnetic plate 13 is separated from the rotating disk 7.

[0037] See also Figure 8 and Fig. 9 As shown, a disinfection mechanism is also included, which includes a power supply component 14, a connecting frame 15 and an ultraviolet lamp 16; the power supply component 14 includes a battery box and dry batteries, the battery box is installed on the lower side of the fixed block 1, and the battery box has detachable dry batteries installed; the bottom of the closed frame 11 and the top of the movable frame 12 are both connected to the connecting frame 15; the ultraviolet lamp 16 is installed in the connecting frame 15, the ultraviolet lamp 16 is used to disinfect the catheter 101, and the ultraviolet lamp 16 is electrically connected to the dry batteries of the power supply component 14.

[0038] See also Figure 8 and Fig. 9 As shown, a contact switch 17 is also included; the contact switch 17 is connected to the right side of the connecting frame 15, the dry battery of the power supply component 14 and the ultraviolet lamp 16 are electrically connected to the contact switch 17, and the contact switch 17 is used to control the switch of the ultraviolet lamp 16.

[0039] See also Figure 8 and Fig. 9 As shown, a magnetic block 18 is also included; the two connecting frames 15 are connected to the magnetic block 18 on the sides away from each other, and the magnetic blocks 18 on the two connecting frames 15 are attracted to each other to fix the movable frame 12 in the closed state.

[0040] When the movable frame 12 rotates to close, the movable frame 12 will drive the connecting frame 15, the ultraviolet lamp 16, the contact switch 17 and the magnetic block 18 thereon to rotate synchronously, so that the movable frame 12 and the connecting frame 15, the contact switch 17 and the magnetic block 18 on the closed frame 1 are in contact. By the contact of the two connecting frames 15, the movable frame 12 and the closed frame 1 can be sealed. By the contact of the two contact switches 17, the contact switch 17 can control the ultraviolet lamp 16 to turn on, and the dry battery of the power supply component 14 provides power to the ultraviolet lamp 16, so that the ultraviolet lamp 16 can irradiate ultraviolet rays in the closed frame 1. The catheter 101 is placed on the catheter 101, thereby sterilizing the catheter 101. The two magnetic blocks 18 are in contact with each other, so that the two magnetic blocks 18 can attract each other through magnetic force to fix the movable frame 12 in the closed state to prevent the movable frame 12 from being opened at will. When the movable frame 12 is reversed and closed, the movable frame 12 will drive the connecting frame 15, the ultraviolet lamp 16, the contact switch 17 and the magnetic block 18 thereon to reverse synchronously, so that the movable frame 12 and the connecting frame 15, the contact switch 17 and the magnetic block 18 on the closed frame 1 are separated. By separating the two contact switches 17, the contact switch 17 can control the ultraviolet lamp 16 to be turned off.

[0041] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hemodialysis catheter fixing device, comprising a fixing block (1), characterized in that: The fixing block (1) is connected to a shoulder strap (2), one end of the shoulder strap (2) is connected to a binding strap (3), a Velcro (4) is provided between the two ends of the binding strap (3), the other end of the shoulder strap (2) is connected to a slide buckle (5), the slide buckle (5) slides on the binding strap (3), a locking mechanism is provided inside the slide buckle (5), and the locking mechanism is used to lock the slide buckle (5) on the binding strap (3), a rotating disk (7) is rotatably provided on the fixing block (1), a rubber clamp (8) for fixing the catheter (101) is connected to the rotating disk (7), a limiting mechanism and a fixing mechanism are provided inside the fixing block (1), the limiting mechanism is used to limit the rotating disk (7), and the fixing mechanism is used to fix the limiting mechanism, a closing frame (11) is installed on the rotating disk (7), a movable frame (12) is rotatably provided on the closing frame (11), and both the closing frame (11) and the movable frame (12) are used to close the port of the catheter (101).

2. A hemodialysis catheter fixing device as claimed in claim 1, characterized in that: The locking mechanism comprises a sliding frame (601), a fixing pin (602), a first spring (603) and a first slider (604); the sliding frame (601) is slidably arranged on the inner side of the slider (5); the fixing pins (602) are connected to the sliding frame (601) at intervals; the fixing pins (602) are used to penetrate into the binding belt (3) to lock the slider (5); the first spring (603) is connected between the sliding frame (601) and the inner side of the slider (5); the first slider (604) is slidably arranged on the side of the slider (5); the first slider (604) is used to press the sliding frame (601) to slide on the inner side of the slider (5).

3. A hemodialysis catheter fixing device as claimed in claim 2, characterized in that: The limiting mechanism comprises a second slider (901), a second spring (902) and a rubber block (903); the second slider (901) is slidably arranged on the side of the fixed block (1); the second spring (902) is installed between the second slider (901) and the inner side of the fixed block (1); the rubber block (903) is connected to the second slider (901); the rubber block (903) is located on the inner side of the fixed block (1); and the rubber block (903) is used to limit the rotating disk (7).

4. A hemodialysis catheter fixing device as claimed in claim 3, characterized in that: The fixing mechanism comprises a movable rod (1001), a third spring (1002) and a limit block (1003); the movable rod (1001) is slidably arranged on the side of the fixing block (1); the third spring (1002) is installed between the movable rod (1001) and the inner side of the fixing block (1); the limit block (1003) is connected to the movable rod (1001); the limit block (1003) is located on the inner side of the fixing block (1); and the limit block (1003) is used to block the rubber block (903) so as to fix the rubber block (903).

5. A hemodialysis catheter fixing device as claimed in claim 4, characterized in that: It also includes a magnetic plate (13), which is mounted on the movable frame (12). The magnetic plate (13) is used to be adsorbed on the rotating disk (7) to fix the movable frame (12) in an open state.

6. A hemodialysis catheter fixing device as claimed in claim 5, characterized in that: The apparatus also includes a disinfection mechanism, which includes a power supply component (14), a connection frame (15) and an ultraviolet lamp tube (16). The power supply component (14) is installed in the fixed block (1), the connection frame (15) is connected to the closed frame (11) and the movable frame (12), and the ultraviolet lamp tube (16) is installed in the connection frame (15). The ultraviolet lamp tube (16) is used to disinfect the catheter (101), and the ultraviolet lamp tube (16) is electrically connected to the power supply component (14).

7. A hemodialysis catheter fixing device as claimed in claim 6, characterized in that: It also includes a contact switch (17), the contact switch (17) being connected to the connection frame (15), the power supply component (14) and the ultraviolet lamp tube (16) being electrically connected to the contact switch (17), and the contact switch (17) being used to control the switch of the ultraviolet lamp tube (16).

8. A hemodialysis catheter fixing device as claimed in claim 7, characterized in that: It also includes a magnetic block (18), which is connected to the connecting frame (15), and the movable frame (12) in the closed state is fixed by the attraction of the magnetic blocks (18) on the connecting frame (15).

Images