Sleeve for preventing pressure sores of ankles

Abstract

The utility model discloses a sleeve for preventing pressure sores on ankles, which relates to the technical field of medical nursing materials and comprises a foot sleeve used for wrapping ankles and feet. The foot pad is arranged in the foot sleeve, and the foot pad is used for protecting ankles and feet; the heel and the ankle can be wrapped together through the foot sleeve, the heel and the ankle are protected through the foot pad, the foot sleeve is fixed through the bandage, the structure is simple, the heel and the ankle can be protected together, and the ventilation performance of the foot sleeve is high.

Description

Technical Field

[0001] The utility model relates to the technical field of medical care products, in particular to a sleeve for preventing pressure sores on feet and ankles. Background Art

[0002] Pressure sores, also known as pressure injuries, are localized injuries to the skin or soft tissue beneath the skin, usually over bony prominences or in areas associated with medical devices. They are intact skin injuries or open ulcers that may be painful. The risk of pressure sores is particularly high for patients with neurological diseases, the elderly, the obese, the frail or malnourished, those with edema, those in pain, those with plaster casts, those with incontinence, those with fever, and those taking sedatives.

[0003] At present, in clinical practice, the prevention of pressure ulcers on the heels is usually carried out by placing an anti-pressure ulcer pressure relief pad on the patient's heel inside the socks after the patient puts on socks, so as to reduce the pressure on the patient's heel when the patient walks, thereby reducing the pressure injury to the patient's heel.

[0004] However, in the process of clinical nursing, medical staff found that the anti-pressure sore pressure relief pads were not firmly fixed and were easily displaced and slipped to the soles of the patients' feet or slipped out of the socks they were wearing, resulting in poor use effect. In addition, in actual operation, it was difficult to quickly and properly place the pads on the heels of the patients to completely cover the heels of the patients, making the operation time-consuming and laborious, and failing to protect the ankles. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art, the utility model provides a foot and ankle pressure sore prevention sleeve. The heel and ankle can be wrapped together by the foot sleeve, and the heel and ankle are protected by the foot pad, and the foot sleeve is fixed by the strap. The structure is simple, the heel and ankle can be protected together, and the foot sleeve has high ventilation performance.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A sleeve for preventing pressure sores on the ankle comprises: a foot sleeve, which is used to wrap the ankle and foot; a foot pad, which is arranged in the foot sleeve and is used to protect the ankle and foot; and a strap, wherein fixing heads are provided at both ends of the strap, and the fixing heads are fixedly connected to the foot sleeve through a fixing piece.

[0008] Through the above scheme, the foot cover can wrap the heel and ankle together, and the heel and ankle are protected by the foot pad, and the foot cover is fixed by the strap. The structure is simple and the heel and ankle can be protected together.

[0009] Furthermore, the upper end and the front end of the foot cover are both opened, a plurality of ventilation holes are arranged on the side of the foot cover, and grooves are arranged on the opposite sides of the foot cover.

[0010] Through the above further scheme, the ventilation holes can increase the breathability of the foot cover, prevent the patient's heels and ankles from sweating, keep the heels and ankles clean and dry, and avoid infection.

[0011] Furthermore, the foot pad includes a bottom pad and two side pads, the top side of the bottom pad is provided with a first protection groove for protecting the bottom of the heel, the top side of the bottom pad close to one end of the first protection groove is provided with a protection pad for protecting the back of the heel, the two side pads are both provided on the side of the foot cover where the groove is provided, one side of the side pad is provided with a protrusion matched with the groove, the other side of the side pad is provided with a second protection groove corresponding to the protrusion, and the side pad is provided with a plurality of ventilation holes around the protrusion.

[0012] Through the above further scheme, the first protection groove can wrap the bottom of the heel to protect the bottom of the heel, the protection pad can wrap the back of the heel to protect the back of the heel, the second protection groove can wrap the ankle to protect the ankle, and the side pad is provided with ventilation holes to increase the breathability of the side pad.

[0013] Furthermore, the foot pad is made of soft material.

[0014] Through the above further scheme, the soft material has high softness and toughness, and can adapt to changes in various shapes and curvatures. In addition, the soft material usually has good compression deformation performance and can effectively alleviate vibration and impact.

[0015] Furthermore, the bottom pad and the side pads are integrally formed.

[0016] Through the above further solution, the fixity of the side pads and the bottom pad can be improved, thereby preventing the bottom pad and the side pads from sliding.

[0017] Furthermore, the bottom pad and the side pads are not connected to each other.

[0018] Through the above further solution, it is possible to easily replace the side pads or the bottom pads separately, thus saving resources.

[0019] Furthermore, the fixing head is provided with a fixing hole, and the side surfaces on both sides of the front end of the foot cover are provided with a plurality of positioning holes, and the fixing piece passes through the fixing hole and is fixedly connected with the positioning hole.

[0020] Through the above further solution, the binding strap can be fixed by inserting the fixing piece into the fixing hole and the positioning hole, and the height and tightness of the binding strap can be set by the position of the positioning hole.

[0021] Furthermore, the material of the binding strap is an elastic band, and the material of the fixing head and the foot cover are both flexible materials.

[0022] Through the above further scheme, the strap material is an elastic band with good expandability, which can avoid over-tightening. The flexible material has adaptability, plasticity and deformability. This material can be deformed under the action of external force and restore its original shape after the external force is removed. They are not only highly adaptable and can be used to manufacture products of various complex shapes, but also have high durability and are not easy to break or age after long-term use. In addition, flexible materials usually have a lower density, which helps to reduce the weight of the product and improve the comfort of use. During the processing, the flexible material consumes relatively less energy and resources, which helps to save energy and protect the environment.

[0023] Furthermore, the fixing member includes a fixing rod, a pressing rod, a first spring, a second spring and a positioning pin, the fixing rod is provided with a first slide groove, the bottom of the first slide groove is located in the fixing rod and a top groove is provided, the side of the top groove is provided with two positioning grooves that penetrate the fixing rod, the two positioning grooves are symmetrically arranged, the positioning groove is provided with a second slide groove, the lower end of the pressing rod passes through the first slide groove and is slidably connected to the top groove, the lower end of the pressing rod is provided with a spring groove, the first spring is arranged in the spring groove, one end of the first spring is fixedly connected to the bottom of the top groove, and the other end is fixedly connected to the bottom of the spring groove, and a plurality of positioning rings are provided on the pressing rod at the first slide groove, The pressing rod is provided with a plurality of evenly arranged through grooves on the positioning ring at the lower end, and a plurality of evenly arranged limit rods are provided on the first slide groove near one end of the top groove, the limit rods are adapted to the through grooves, the positioning pin is slidably connected in the positioning groove, one end of the positioning pin is provided with a sharp tip, and the other end is provided with an inclined sliding surface, a limit ring is provided on the positioning pin at the second slide groove, the limit ring is slidably connected with the second slide groove, the second spring is sleeved on the limit rod, one end of the second spring is fixedly connected to the limit ring, and the other end is fixedly connected to the second slide groove facing the outside, and the pressing rod is provided with a spring groove, and one end thereof passes through the end of the fixed rod to the outside and is provided with a twist handle.

[0024] Through the above-mentioned further scheme, the pressing rod can be pressed downward to squeeze the positioning needle through the inclined sliding surface, pushing the positioning needle to slide outward. After the groove on the pressing rod passes through the limiting rod, the pressing rod is rotated by twisting the handle so that the limiting rod blocks the positioning ring at the lower end of the pressing rod, thereby preventing the pressing rod from rising through the elastic force of the first spring, and then preventing the positioning needle from rebounding through the elastic force of the second spring.

[0025] To sum up, the utility model provides a foot and ankle pressure sore prevention sleeve with the following technical effects: the foot sleeve can wrap the heel and ankle together, and protect the heel and ankle through the foot pad, and the foot sleeve is fixed by the strap, the structure is simple, and the heel and ankle can be protected together, and the foot sleeve has high ventilation performance, which can prevent the patient's heel and ankle from sweating, keep the heel and ankle clean and dry, and avoid infection. The strap can be fixed by inserting the fixing part into the fixing hole and the positioning hole, and the height and tightness of the strap can be set according to the position of the positioning hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the midfoot cover of the utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the midsole pad of the utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the second protection groove provided in the side pad of the utility model;

[0031] Figure 5 This is a schematic diagram of a raised structure provided on the side pad of the utility model;

[0032] Figure 6 This is a schematic diagram of the cross-sectional structure of the side pad in the utility model;

[0033] Figure 7 This is a schematic diagram of the binding structure in the utility model;

[0034] Figure 8 It is a schematic diagram of the overall structure of the fixing member in the utility model;

[0035] Fig. 9 This is a schematic diagram of the cross-sectional structure of the fixing member in the utility model;

[0036] Fig.10 For the utility model Figure 8 A schematic diagram of the partially enlarged structure at center A;

[0037] Fig.11 For the utility model Figure 8 Schematic diagram of the local enlarged structure at point B in the middle.

[0038] In the figure: 1. foot cover; 11. ventilation hole; 12. groove; 13. positioning hole; 2. foot pad; 21. bottom pad; 211. first protection groove; 212. protection pad; 22. side pad; 221. protrusion; 222. second protection groove; 223. ventilation hole; 3. strap; 31. fixing head; 311. fixing hole; 4. fixing piece; 41. fixing rod; 411. first slide groove; 411a. limiting rod; 412. top groove; 413. positioning groove; 414. second slide groove; 42. pressing rod; 421. spring groove; 422. positioning ring; 422a. through groove; 423. twist handle; 43. first spring; 44. second spring; 45. positioning pin; 451. tip; 452. inclined sliding surface; 453. limiting ring. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present utility model, 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 connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] Embodiment 1;

[0043] See also Figure 1-Figure 8As shown, the utility model discloses a sleeve for preventing pressure sores on the foot and ankle, including a sleeve 1, the upper end and the front end of the sleeve 1 are both opened, a plurality of ventilation holes 11 are arranged on the side of the sleeve 1, the ventilation holes 11 can increase the air permeability of the sleeve 1, prevent the patient's heels and ankles from sweating, keep the heels and ankles clean and dry, and prevent infection, grooves 12 are arranged on the opposite sides of the sleeve 1, a bottom pad 21 is arranged on the bottom of the sleeve 1, a first protection groove 211 for protecting the bottom of the heel is arranged on the upper side of the bottom pad 21, the first protection groove 211 can wrap the bottom of the heel to protect the bottom of the heel, a protection pad 212 for protecting the back of the heel is arranged on one end of the upper side of the bottom pad 21 close to the first protection groove 211, the protection pad 212 can wrap the back of the heel to protect the back of the heel, the grooves 12 are arranged on both sides of the sleeve 1, and side pads 22 are arranged on one side of the side pad 22 There is a protrusion 221 matched with the groove 12, and a second protective groove 222 is provided on the other side of the side pad 22 corresponding to the protrusion 221. The second protective groove 222 can wrap the anklebone and protect the anklebone. A plurality of ventilation holes 223 are provided on the side pad 22 around the protrusion 221, and the ventilation holes 223 are provided on the side pad 22 to increase the breathability of the side pad 22. The side surfaces on both sides of the front end of the foot cover 1 are connected to the fixing head 31 through the fixing parts 4. A plurality of positioning holes 13 are provided on the side surfaces on both sides of the front end of the foot cover 1. The positioning holes 13 are evenly arranged up and down and left and right. Two fixing holes 311 are provided on the fixing head 31. The fixing parts 4 pass through the fixing holes 311 and are fixedly connected to the positioning holes 13. The two fixing heads 31 are connected through the strap 3. The height and tightness of the strap 3 are set according to the position of the positioning holes 13, and the overall breathability can be increased through the positioning holes 13.

[0044] Among them, a notch is provided at the top of the foot cover 1, which can reduce the contact area with the skin and improve comfort.

[0045] Among them, the foot pad 2 is made of soft material. The soft material has high softness and toughness and can adapt to changes in various shapes and curvatures. In addition, soft materials usually have good compression deformation performance and can effectively relieve vibration and impact. Soft materials such as memory foam, silicone and gel. The memory foam material can adapt to the shape and pressure points of the foot and provide good support and comfort. Its slow rebound property helps to disperse pressure and reduce the risk of pressure sores. The silicone nipple is soft and skin-friendly, can fit the shape of the foot, and has a certain degree of elasticity and support, which helps to reduce the uneven pressure distribution of the foot when standing or sitting for a long time, thereby reducing the risk of pressure sores. The gel pressure sore pad can fully disperse the pressure, conform to the movement of the bone protrusion, effectively relieve shear force and friction, and has a good effect on preventing pressure sores.

[0046] Among them, refer to Figure 7As shown, the material of the strap 3 is an elastic band, and the strap 3 is set to a certain width to prevent the strap 3 from being too thin and causing harm to the patient. The material of the strap 3 is an elastic band, which has good expandability and can avoid over-tightening to improve applicability.

[0047] Among them, the fixing head 31 and the foot cover 1 are made of flexible materials, which are adaptable, plastic and deformable. Such materials can be deformed under the action of external force and restore their original shape after the external force is removed. They are not only highly adaptable and can be used to manufacture products of various complex shapes, but also highly durable and not easy to break or age after long-term use. In addition, flexible materials usually have a lower density, which helps to reduce the weight of the product and improve the comfort of use. During the processing, the energy and resources consumed by flexible materials are relatively small, which helps to save energy and protect the environment.

[0048] Among them, refer to Figure 8-Figure 11As shown, the fixed head 31 includes a fixing rod 41, a pressing rod 42, a first spring 43, a second spring 44 and a positioning pin 45. A first slide groove 411 is provided in the fixing rod 41. The bottom of the first slide groove 411 is located in the fixing rod 41. A top groove 412 is provided in the fixing rod 41. Two positioning grooves 413 that penetrate the fixing rod 41 are provided on the side of the top groove 412. The two positioning grooves 413 are symmetrically arranged. A second slide groove 414 is provided in the positioning groove 413. The lower end of the pressing rod 42 passes through the first slide groove 411 and is slidably connected to the top groove 412. A spring groove 421 is provided on the lower end of the pressing rod 42. The first spring 43 is arranged in the spring groove 421. One end of the first spring 43 is fixedly connected to the bottom of the top groove 412, and the other end is fixedly connected to the spring The bottom of the groove 421 is fixedly connected, a plurality of positioning rings 422 are provided on the pressing rod 42 at the first slide groove 411, a plurality of evenly arranged through grooves 422a are provided on the positioning ring 422 at the lower end of the pressing rod 42, a plurality of evenly arranged limiting rods 411a are provided on the first slide groove 411 near one end of the top groove 412, the limiting rods 411a are adapted to the through grooves 422a, the positioning pin 45 is slidably connected in the positioning groove 413, a tip 451 is provided at one end of the positioning pin 45, and an inclined sliding surface 452 is provided at the other end, a limiting ring 453 is provided on the positioning pin 45 at the second slide groove 414, the limiting ring 453 is slidably connected to the second slide groove 414, and the second spring 44 is sleeved on the limiting rod 411 The second spring 44 is fixedly connected to the limiting ring 453 at one end, and the other end is fixedly connected to the second sliding groove 414 at one end facing outward. The pressing rod 42 is provided with a spring groove 421, and one end thereof passes through the end of the fixing rod 41 to the outside and is provided with a twist handle 423. The positioning pin 45 is provided with a tip 451 at one end facing outward, and the positioning pin 45 is provided with an inclined sliding surface 452 at one end facing inward, and the inclined sliding surface 452 faces upward, so that when the pressing rod 42 slides down, the positioning pin 45 can be pushed outward by the inclined sliding surface 452, so that the tip 451 of the positioning pin 45 is inserted into the side of the positioning hole 13, and the positioning ring 422 at the upper end of the pressing rod 42 can limit the pressing rod 42 from being excessively upward, so that the pressing rod 42 can be pressed downward. The end portion can always be against the inclined sliding surface 452 to prevent the positioning pin 45 from rotating and affecting the use effect. The positioning ring 422 located in the middle of the pressing rod 42 can limit the pressing rod 42 to prevent the pressing rod 42 from shaking. The through groove 422a on the positioning ring 422 located at the lower end of the pressing rod 42 can pass through the limiting rod 411a on the first sliding groove 411, so that the positioning ring 422 at the lower end of the pressing rod 42 is located on the lower side of the limiting rod 411a. Rotating the pressing rod 42 can make the limiting rod 411a block the positioning ring 422 at the lower end of the pressing rod 42, thereby preventing the pressing rod 42 from rising through the elastic force of the first spring 43, and further preventing the positioning pin 45 from rebounding through the elastic force of the second spring 44.

[0049] Embodiment 2:

[0050] On the basis of the first embodiment, the bottom pad 21 and the side pad 22 are integrally formed, which can improve the fixity of the side pad 22 and the bottom pad 21 and avoid sliding of the bottom pad 21 and the side pad 22 .

[0051] Embodiment 3:

[0052] On the basis of Embodiment 1, the bottom pad 21 and the side pads 22 are not connected to each other, so that the side pads 22 or the bottom pad 21 can be replaced separately, thus saving resources.

[0053] The working principle of the utility model is as follows: the bottom pad 21 is placed on the inner bottom of the foot sleeve 1, the side pad 22 is placed on the inner side of the foot sleeve 1, the protrusion 221 on the side pad 22 is placed in the groove 12, the foot sleeve 1 is put into the patient's foot, so that the bottom of the heel is located in the first protection groove 211, and the ankle is placed in the second protection groove 222, and then the fixing head 31 on the strap 3 is placed on both sides of the outside of the foot sleeve 1, and after adjusting the tightness for the patient, one end of the fixing member 4 with the positioning pin 45 is passed through the fixing hole 311 into the positioning hole 13, and then the pressing rod 42 is pressed downward, and the pressing rod 42 can squeeze the positioning pin 45 through the inclined sliding surface 452 to push the positioning pin 45 to The pressing rod 42 is slid outward and nailed into the side of the positioning hole 13. After the through groove 422a on the pressing rod 42 passes through the limiting rod 411a, the pressing rod 42 is rotated by the twist handle 423, so that the limiting rod 411a blocks the positioning ring 422 at the lower end of the pressing rod 42, thereby preventing the pressing rod 42 from rising through the elastic force of the first spring 43, and then preventing the positioning pin 45 from rebounding through the elastic force of the second spring 44, thereby completing the fixation of the fixing head 31, thereby fixing the strap 3. When the strap 3 needs to be loosened, the pressing rod 42 is rotated by the twist handle 423 to make the position of the through groove 422a correspond to the position of the limiting rod 411a, and the disassembly can be completed through the elastic force of the first spring 43 and the second spring 44.

[0054] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A sleeve for preventing pressure sores on the ankle, characterized in that: include: A foot cover (1), the foot cover (1) is used to wrap the ankle and foot; A foot pad (2), the foot pad (2) being arranged in the foot cover (1), and the foot pad (2) being used to protect the ankle and foot; A binding strap (3), wherein both ends of the binding strap (3) are provided with fixing heads (31), and the fixing heads (31) are fixedly connected to the foot cover (1) via a fixing piece (4); The upper end and the front end of the foot cover (1) are both opened, a plurality of ventilation holes (11) are provided on the side of the foot cover (1), and grooves (12) are provided on opposite sides of the foot cover (1); The foot pad (2) comprises a bottom pad (21) and two side pads (22); a first protection groove (211) for protecting the bottom of the heel is provided on the upper side of the bottom pad (21); a protection pad (212) for protecting the rear of the heel is provided on one end of the upper side of the bottom pad (21) close to the first protection groove (211); the two side pads (22) are both provided on the side of the foot cover (1) where the groove (12) is provided; a protrusion (221) matching the groove (12) is provided on one side of the side pad (22); a second protection groove (222) is provided on the other side of the side pad (22) at a position corresponding to the protrusion (221); and a plurality of ventilation holes (223) are provided on the side pad (22) around the protrusion (221).

2. The ankle pressure sore prevention sleeve according to claim 1, characterized in that: The foot pad (2) is made of a soft material.

3. The ankle pressure sore prevention sleeve according to claim 2, characterized in that: The bottom pad (21) and the side pad (22) are integrally formed.

4. The foot and ankle pressure sore prevention sleeve according to claim 2, characterized in that: The bottom pad (21) and the side pad (22) are not connected to each other.

5. The foot and ankle pressure sore prevention sleeve according to claim 1, characterized in that: The fixing head (31) is provided with a fixing hole (311), and the side surfaces on both sides of the front end of the foot cover (1) are provided with a plurality of positioning holes (13), and the fixing member (4) passes through the fixing hole (311) and is fixedly connected to the positioning holes (13).

6. The foot and ankle pressure sore prevention sleeve according to claim 5, characterized in that: The material of the binding strap (3) is an elastic band, and the material of the fixing head (31) and the foot cover (1) are both flexible materials.

7. The ankle pressure sore prevention sleeve according to claim 6, characterized in that: The fixing member (4) comprises a fixing rod (41), a pressing rod (42), a first spring (43), a second spring (44) and a positioning pin (45); a first sliding groove (411) is provided in the fixing rod (41); a top groove (412) is provided in the fixing rod (41) at the bottom of the first sliding groove (411); two positioning grooves (413) penetrating the fixing rod (41) are provided on the side of the top groove (412); the two positioning grooves (413) are symmetrically arranged; and a second spring (44) is provided in the positioning groove (413). There is a second slide groove (414), the lower end of the pressing rod (42) passes through the first slide groove (411) and is slidably connected to the top groove (412), the lower end of the pressing rod (42) is provided with a spring groove (421), the first spring (43) is arranged in the spring groove (421), one end of the first spring (43) is fixedly connected to the bottom of the top groove (412), and the other end is fixedly connected to the bottom of the spring groove (421), and a plurality of positioning rings (422) are provided on the pressing rod (42) at the first slide groove (411). The pressing rod (42) is provided with a plurality of evenly arranged through grooves (422a) on the positioning ring (422) at the lower end, and the first slide groove (411) is provided with a plurality of evenly arranged limiting rods (411a) at one end close to the top groove (412), and the limiting rods (411a) are adapted to the through grooves (422a), and the positioning pin (45) is slidably connected in the positioning groove (413), and the positioning pin (45) is provided with a tip (451) at one end and an inclined sliding surface (452) at the other end, and the positioning pin ( A limiting ring (453) is provided on the second slide groove (414), and the limiting ring (453) is slidably connected to the second slide groove (414). The second spring (44) is sleeved on the limiting rod (411a). One end of the second spring (44) is fixedly connected to the limiting ring (453), and the other end is fixedly connected to the second slide groove (414) toward the outside. The pressing rod (42) is provided with a spring groove (421) and one end thereof passes through the end of the fixing rod (41) to the outside and is provided with a twist handle (423).

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