Self-heating foot pressure sore protection patch

Abstract

The utility model discloses a kind of self-heating foot pressure sore protection patches, including protection patch main body, connecting sheet, heating assembly and pressure piece, protection patch main body is worn on patient's foot, protection patch main body includes left side piece and right side piece, connecting sheet one end is fixed on left side piece, other end is detachably connected with right side piece by quick wear and tear component on right side piece, heating assembly is set on protection patch main body, corresponding patient's sole and heel, heating assembly automatically generates heat, provide heat for patient's foot, pressure piece is set on protection patch main body, close to patient's ankle, decompression to ankle. Advantage, protection patch main body is worn on patient's foot by quick wear and tear component, the tightness after protection patch main body is adjusted by using tightness adjusting mechanism, suitable for different patients, heating assembly in protection patch main body is used, heat patient's foot, prevent foot temperature too low, pressure piece in protection patch main body is used, and patient's ankle, which is prone to pressure sore, is contacted, to prevent the occurrence of pressure sore.

Description

Technical Field

[0001] This utility model specifically relates to a self-heating foot pressure ulcer protective patch. Background Technology

[0002] During the perioperative period, patients are highly susceptible to hypothermia due to various factors such as anesthesia, surgical procedures, and environmental exposure. Hypothermia not only causes discomfort but can also trigger a series of serious complications, such as adverse cardiovascular events (e.g., ventricular arrhythmias, myocardial ischemia, myocardial infarction), surgical site infection, coagulation and fibrinolysis disorders, increased blood transfusion requirements, altered efficacy and metabolism of anesthetic drugs, prolonged postoperative recovery time, and increased discomfort symptoms such as chills. Therefore, perioperative temperature control is of great significance for improving surgical safety and promoting postoperative recovery.

[0003] Currently, perioperative body temperature protection mainly relies on physical warming measures (such as warm air blowers, warming blankets, infusion warmers, etc.) and drug interventions. However, these measures often fail to provide effective protection for the patient's feet, a part that is easily compressed and dissipates heat.

[0004] In addition, the feet are a distal part of the body with relatively poor blood circulation, making them more prone to hypothermia and pressure sores during the perioperative period. Therefore, in clinical practice, it is necessary to prevent hypothermia in patients' feet while also taking precautions against pressure sores.

[0005] Chinese patent CN202322704538.8, entitled "A Foot Warmer for Knee Joint Surgery," describes a foot cover body. The foot cover body has an inner contour that adapts to the outer contour of the patient's foot, allowing the foot to be accommodated. The front outer portion of the foot cover body has a slit for easy opening and closing, and the slit has connecting and separating sections on both sides. These sections allow for easy opening and closing of the slit when the foot cover is fully worn.

[0006] As shown in patent CN202322704538.8, this patent mainly uses an insulating liner and a heating plate to heat and keep the patient's feet warm. This technical solution can achieve the effect of keeping warm when in use, but it requires electricity and greatly restricts the patient's movement. At the same time, this technical solution does not have the ability to prevent pressure sores on the patient's feet. Utility Model Content

[0007] The technical problem to be solved by this utility model is that the existing perioperative body temperature protection methods mentioned in the background art have poor effect on protecting the body temperature of patients' feet and are prone to pressure sores on the feet.

[0008] To address the aforementioned technical problems, a self-heating foot pressure ulcer protective patch is proposed. This is achieved through the following technical solution: A self-heating foot pressure ulcer protective patch includes a main body, a connecting piece, a heating component, and an anti-pressure plate. The main body is worn on the patient's foot and includes a left side panel and a right side panel. One end of the connecting piece is fixed to the left side panel, and the other end is detachably connected to the right side panel via a quick-release component. The heating component is detachably mounted on the main body, corresponding to the patient's sole and heel. The heating component automatically generates heat to provide warmth to the patient's foot. The anti-pressure plate is detachably mounted on the main body, close to the patient's ankle, to relieve pressure on the ankle.

[0009] In a preferred embodiment of the present invention, the protective patch includes an ankle protection part and a foot protection part, which are connected. The ankle protection part covers the patient's ankle, and the foot protection part covers the patient and the foot.

[0010] In a preferred embodiment of the present invention, the connecting piece includes a first connecting piece, a second connecting piece, and a third connecting piece. The first connecting piece is disposed at the ankle protection part of the protective patch body, the third connecting piece is disposed at the foot protection part of the protective patch body, and the second connecting piece is located between the first connecting piece and the third connecting piece. This arrangement improves the stability of the protective patch body when worn.

[0011] In a preferred embodiment of the present invention, the connecting piece is made of an elastic fabric, such as a spandex blend or Lycra. The connecting piece facilitates the stable wearing of the protective patch onto the patient's foot.

[0012] In a preferred embodiment of the present invention, the heating component includes a self-heating heating pack, and a gel thermal conductive layer is provided on the side of the heating pack. The provision of the gel thermal conductive layer enables the heat from the heating pack to be evenly distributed, improving patient comfort while preventing heat concentration in a certain location.

[0013] In a preferred embodiment of the present invention, the quick-release assembly includes a connecting buckle, a connecting block, and a mounting block. The mounting block is fixed on the right side plate, the connecting buckle is disposed on the connecting plate, and the connecting block is disposed inside the mounting block. The connecting buckle and the connecting block are connected in cooperation. The quick-release assembly facilitates the quick release of the protective patch body and is convenient to use.

[0014] In a preferred embodiment of the present invention, an insertion port and a limiting port are provided on the connecting block. The size of the insertion port is larger than that of the limiting port. The connecting buckle is inserted into the connecting block through the insertion port and engages with the limiting port for limiting. This arrangement facilitates the quick wearing and removal of the protective patch body.

[0015] In a preferred embodiment of the present invention, a tension adjustment mechanism is provided within the mounting block. The tension adjustment mechanism includes a pull rope, a ratchet and pawl mechanism, and an adjustment knob. One end of the pull rope is connected to the connecting block, and the other end is wound around the adjustment knob. The pull rope can controllably pull the connecting block to move within the mounting block. The ratchet and pawl mechanism is connected to the adjustment knob and restricts the rotation direction of the adjustment knob. The tension adjustment mechanism facilitates the adjustment of the tightness of the protective patch body, thereby improving patient comfort.

[0016] In a preferred embodiment of the present invention, the adjustment knob includes a winding rod, a base plate, a top cover, an outer sleeve, and a return spring. The winding rod is mounted on the base plate, one end of the outer sleeve is fitted onto the base plate, and the top cover closes the other end of the outer sleeve. The return spring is located inside the outer sleeve, between the base plate and the top cover. When the outer sleeve is pressed, the return spring is compressed, and the outer sleeve contacts the unlocking piece on the pawl of the ratchet and pawl mechanism, thereby releasing the ratchet and pawl mechanism from its limit. This arrangement facilitates the quick release of the ratchet and pawl mechanism from the limit of the adjustment knob and facilitates the quick disconnection of the connecting piece from the right side piece.

[0017] In a preferred embodiment of the present invention, the pressure relief pad is made of a material with a certain degree of elasticity, such as silicone foam and polyurethane foam. This provides cushioning for the feet, relieves pressure on the feet, and prevents pressure sores.

[0018] The advantages of this utility model compared with the prior art are: The technical solution of this utility model involves putting the protective patch on the patient's foot using a quick-release assembly, making it easy to put on and take off. The tightness adjustment mechanism within the quick-release assembly allows for adjustment of the tightness of the protective patch after it is put on, making it convenient to use and suitable for different patients. Furthermore, a self-heating component located within the protective patch heats the patient's foot to prevent it from becoming too cold. Additionally, an anti-pressure pad located within the protective patch contacts the patient's ankle, which is prone to pressure sores, to prevent pressure sores from forming. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a schematic diagram of the connecting piece of this utility model after it has been opened; Figure 3 A 3D schematic diagram of the quick-donning and doffing components; Figure 4 A partial cross-sectional view of the quick-don't-on component; Figure 5 Exploded view of the quick-release assembly; Figure 6 This is a three-dimensional schematic diagram of the tension adjustment mechanism; Figure 7 A partial sectional view of the adjustment knob; Figure 8 Exploded view of the tension adjustment component; Figure 9 This is a cross-sectional view of the heating element; Figure 10 This is an exploded view of the present invention; Explanation of reference numerals in the attached drawings: 1-Main body of the protective patch, 11-Ankle protection part, 12-Sole protection part, 2-Connecting piece, 21-First connecting piece, 22-Second connecting piece, 23-Third connecting piece, 3-Quick put-on and take-off assembly, 31-Connecting buckle, 32-Connecting block, 33-Mounting block, 34-Limiting rod, 35-Insertion entrance, 36-Slide groove, 37-Limiting port, 38-Magnet, 4-Tightness adjustment mechanism, 41-Pull cord, 42-Ratchet and pawl mechanism, 43-Unlocking piece, 5-Adjustment knob, 51-Winding rod, 52-Base plate, 53-Top cover, 54-Outer cover, 55-Guide rod, 56-Guide hole, 57-Reset spring, 6-Heating component, 61-Heating pack, 62-Gel heat-conducting layer, 7-Pressure-resistant sheet. Detailed Implementation

[0020] The following will refer to the appendix in the embodiments of this utility model. Figure 1-10 The technical solutions in the embodiments of this utility model will be described in detail below. Example

[0021] like Figure 1 , 2 As shown in Figure 3, a self-heating foot pressure ulcer protective patch includes a protective patch body 1, a connecting piece 2, a quick-wearing assembly 3, a tightness adjustment mechanism 4, a heating assembly 6, and an anti-pressure sheet 7.

[0022] The protective patch body 1 is worn on the patient's foot. The protective patch body 1 includes a left side piece and a right side piece. One end of the connecting piece 2 is connected to the left side piece of the protective patch body 1, and the other end is connected to the right side piece through the quick-wearing assembly 3. The tightness of the connection is adjusted by the tightness adjustment mechanism 4.

[0023] A self-heating component 6 is installed inside the protective patch body 1, corresponding to the patient's heel and sole. The heating component 6 can heat the patient's heel and sole to prevent the patient's feet from getting cold.

[0024] The pressure relief pad 7 is installed inside the main body 1 of the protective patch, corresponding to the patient's ankle. The pressure relief pad 7 can cushion and reduce pressure on the patient's ankle, which is prone to pressure, and prevent pressure sores from forming.

[0025] like Figure 1 , 2As shown in Figure 10, the main body 1 of the protective patch is made of breathable cotton fabric. The overall shape of the main body 1 of the protective patch is similar to that of a sock. The main body 1 of the protective patch includes an ankle protection part 11 that wraps around the ankle and protects the ankle, and a foot protection part 12 that wraps around the foot and protects the foot. The ankle protection part 11 and the foot protection part 12 are integrally connected.

[0026] The protective patch body 1 has an opening that is not closed at the position corresponding to the toes, making it suitable for different sizes of feet. In addition, for easy wearing and taking off, there is also an opening on the upper surface, dividing the protective patch body 1 into two side pieces, left and right.

[0027] To ensure the stability of the protective patch body 1 when worn on the patient's foot, a connecting piece 2 is sewn at the edge of the left side panel of the protective patch body 1. The connecting piece 2 connects the left side panel and the right side panel. The connecting piece 2 is made of elastic fabric, such as spandex blended fabric and Lycra fabric. In this embodiment, spandex blended fabric is preferred. This design improves the comfort of the patient's foot when the protective patch body 1 is worn on the patient's foot.

[0028] To improve the connection effect, this embodiment preferably provides three connecting pieces 2, namely a first connecting piece 21, a second connecting piece 22 and a third connecting piece 23. The three connecting pieces are distributed at intervals on the protective patch body 1, wherein the first connecting piece 21 is located at the ankle protection part 11, the third connecting piece 23 is located at the foot protection part 12, and the second connecting piece 22 is located between the first connecting piece 21 and the third connecting piece 23.

[0029] like Figure 1 , 3 As shown in Figures 4, 5, and 6, in order to facilitate the quick wearing and removal of the protective patch body 1, a quick-wearing and removal assembly 3 is fixed on the right side panel. The quick-wearing and removal assembly 3 movably connects the connecting piece 2 to the right side panel, making it convenient and quick to connect the connecting piece 2 to the right side panel.

[0030] The quick-release assembly 3 includes a connecting buckle 31, a connecting block 32, and a mounting block 33. The mounting block 33 is mounted on the right side plate, the connecting block 32 is mounted inside the mounting block 33, and the connecting buckle 31 is fixed on the connecting plate 2. The connecting buckle 31 and the connecting block 32 are detachably coupled, which facilitates the connection between the connecting plate 2 and the right side plate of the protective patch body 1.

[0031] The connecting buckle 31 is a circular iron piece. A circular rod protrudes from the surface of the connecting buckle 31. This rod is called the limiting rod 34. The diameter of the limiting rod 34 is smaller than the diameter of the connecting buckle 31. The other end of the limiting rod 34 is fixed to the connecting piece 2 by a rivet.

[0032] The connecting block 32 is a rectangular block made of plastic. One end of the connecting block 32 is arc-shaped. In order to facilitate the connection between the connecting buckle 31 and the connecting block 32, a circular groove is recessed in the surface of the connecting block 32. This groove is named the insertion entrance 35. The diameter of the insertion entrance 35 is the same as the diameter of the connecting buckle 31.

[0033] To ensure the stability of the engagement between the connecting buckle 31 and the connecting block 32, a circular groove is provided on the connecting block 32 near the insertion port. This groove is named the limiting port 37. The diameter of the limiting port 37 is slightly larger than the diameter of the limiting link 34 but smaller than the diameter of the connecting buckle 31. At the same time, a clearance groove is also provided on the side wall of the limiting port 37. The size of the clearance groove is equal to the diameter of the connecting buckle 31. After the connecting buckle 31 is placed in the insertion port 35, pulling the connecting buckle 31 horizontally will move it to the clearance groove. At the same time, the limiting link 34 is located at the limiting port 37, thereby completing the fixation of the connecting buckle 31.

[0034] To maintain stability, a groove is recessed in the ground of the limiting port 37 on the connecting block 32. A magnet 38 is fixed in the groove with glue. The magnet 38 is set with the limiting port 37 in the same circle. When the connecting buckle 31 is located at the limiting port 37, the connecting buckle 31 and the magnet 38 are attracted to each other.

[0035] The mounting block 33 is a rectangular plastic block, which is sewn onto the right side panel. To facilitate the installation of the connecting block 32, a rectangular groove is recessed in the connecting block 32, which is named the sliding groove 36. The connecting block 32 is placed in the sliding groove 36 and can slide in the sliding groove 36 under the action of the tension adjustment mechanism 4, so as to adjust the tension of the protective patch body 1.

[0036] like Figure 6 , 7 As shown in Figure 8, the tension adjustment mechanism 4 includes a pull rope 41, a ratchet and pawl mechanism 42, and an adjustment knob 5. One end of the pull rope 41 is fixedly connected to the connecting block 32, and the other end is wrapped around the adjustment knob 5. The ratchet and pawl mechanism 42 is pinned into the slide groove 36 in the mounting block 33 and connected to the adjustment knob 5. Rotating the adjustment knob 5 can wrap the pull rope 41 around the adjustment knob 5, thereby adjusting the position of the connecting block 32 in the mounting block 33, thus realizing the tension adjustment. The ratchet and pawl mechanism 42 can limit the rotation direction of the adjustment knob 5 to ensure the tension after adjustment.

[0037] The adjustment knob 5 includes a winding rod 51, a base plate 52, a top cover 53, and an outer sleeve 54. The winding rod 51 is a circular plastic tube. The winding rod 51 is connected to the ratchet in the ratchet and pawl mechanism 42 by glue, and the winding rod 51 rotates synchronously with the ratchet.

[0038] The base plate 52 is a circular plastic sheet, which is integrally connected with the winding rod 51. The winding rod 51 is fixed at the center of the base plate 52. The outer sleeve 54 is a circular plastic tube that fits over the base plate 52. To facilitate the rotation of the outer sleeve 54 so that the base plate 52 moves synchronously, four circular rods are evenly protruding from the end face of the base plate 52 near the edge. These rods are called guide rods 55. At the same time, there is a guide hole 56 recessed on the inner side wall of the outer sleeve 54 to cooperate with the guide rod 55. With the cooperation of the guide rod 55 and the guide hole 56, rotating the outer sleeve 54 will cause the base plate 52 and the winding rod 51 to rotate synchronously.

[0039] After the outer sleeve 54 is placed on the base plate 52, in order to prevent the outer sleeve 54 from falling off, a circular limiting platform is protruding outward on the end face of the outer sleeve 54 at the end away from the ratchet and pawl mechanism 42. The limiting platform contacts the end face of the base plate 52, so that the outer sleeve 54 can move along the guide rod 55 towards the ratchet and pawl mechanism 42.

[0040] To facilitate the release of the ratchet and pawl in the ratchet and pawl mechanism 42 and to make it easier to adjust the tightness of the connection between the connecting piece 2 and the protective sticker body 1, a spring is placed inside the outer sleeve 54. This spring is named the return spring 57. At the same time, a circular cover 53 is attached to the end of the outer sleeve 54 with glue. One end of the return spring 57 contacts the cover 53, and the other end contacts the base plate 52. When the adjustment knob 5 is pressed, the outer sleeve 54 moves closer to the ratchet and pawl mechanism 42, at which time the return spring 57 is compressed.

[0041] In the ratchet and pawl mechanism 42, an unlocking piece 43 is integrally fixed on the end face of the pawl. One end of the unlocking piece 43 is inclined and close to the outer sleeve 54. The edge of the outer sleeve 54 contacts the inclined surface of the unlocking piece 43. When the adjustment knob 5 is pressed, the outer sleeve 54 moves and the edge of the outer sleeve 54 presses against the inclined surface of the unlocking piece 43, thereby driving the pawl to move and disengage from the ratchet.

[0042] In this embodiment, the quick-put-on and take-off assembly 3 and the tension adjustment mechanism 4 are used as follows: when connection is required, first, the connecting buckle 31 is placed into the connecting block 32 through the insertion port 35, and then the connecting buckle 31 is pulled to engage the limiting rod 34 with the limiting port 37. At this time, the magnet 38 is attracted to the connecting buckle 31 to complete the connection. When the connecting buckle 31 needs to be removed, the movement is reversed. When it is necessary to tighten, first rotate the adjustment knob 5 clockwise. At this time, the ratchet in the ratchet and pawl mechanism 42 moves synchronously, and the pull rope 41 is wound around the winding rod 51, which in turn drives the connecting block 32 to move in the direction of the adjustment knob 5 to complete the tightening. At this time, the connecting piece 2 is subjected to force and produces a certain elastic change. When loosening is required, press the outer sleeve 54 in the adjustment knob 5. At this time, the outer sleeve 54 moves and contacts the unlocking piece 43, releasing the engagement between the pawl and the ratchet. Then, under the pulling force of the connecting piece 2, the connecting block 32 moves away from the adjustment knob 5, completing the loosening.

[0043] like Figure 2 , 9 As shown in Figure 10, the heating component 6 includes a heating pack 61 and a gel thermal conductive layer 62. The heating pack 61 is an existing self-heating pack that releases heat through the oxidation of iron powder, and can be directly used in existing devices.

[0044] The gel thermal conductive layer 62 is an existing gel that can absorb heat and conduct and dissipate heat evenly. In this embodiment, an existing polyacrylic acid gel is preferred. The heating pack 61 is in contact with the gel thermal conductive layer 62. The heat emitted by the heating pack 61 can be conducted to the patient's foot through the gel thermal conductive layer 62, avoiding direct contact between the heating pack 61 and the patient's skin.

[0045] Regarding the connection between the heating pack 61 and the gel heat-conducting layer 62, the gel heat-conducting layer 62 is wrapped and sealed by a non-woven fabric layer. The heating pack 61 is sealed as a whole, just like the existing self-heating "heat patch". The heating pack 61 is then fixed together with the gel heat-conducting layer 62 by glue to form a sheet shape.

[0046] To prevent pressure sores on the patient's feet, an anti-pressure sheet 7 is also provided inside the main body 1 of the protective patch. The anti-pressure sheet 7 is a rectangular sheet made of a material with a certain degree of elasticity, such as polyurethane foam or silicone foam. In this embodiment, polyurethane foam is preferred. The anti-pressure sheet 7 is placed inside the main body 1 of the protective patch, corresponding to the patient's ankle. The anti-pressure sheet 7 can relieve pressure on the patient's ankle and avoid pressure injury.

[0047] Regarding the installation and replacement of the anti-pressure plate 7 and the heating element 6, the anti-pressure plate 7 and the heating element 6 can be fixed inside the protective film body 1 using Velcro or self-adhesive tape. In this embodiment, self-adhesive tape is preferred to be used to stick them inside the protective film body 1 for easy replacement.

[0048] Advantages of the technical solution in this embodiment: Easy to put on and take off: The device has a simple overall structure. The quick-put and take-off component 3 with magnetic attraction function enables the quick put-on and take-off of the protective patch body 1. Unlike the traditional slip-on method, it is suitable for patients with foot injuries. Simple to use and low cost: The device has a simple overall structure and is easy to use. It can be worn directly on the patient's foot and has no complicated electronic components, resulting in low operating costs. Adjustable tightness: The tightness of the protective sticker body 1 can be adjusted using the tightness adjustment mechanism 4, which is convenient to use; Preventing pressure sores: The pressure relief pad 7, located inside the main body 1 of the protective patch, reduces pressure on the patient's feet, thus preventing pressure injuries. Reusable: The heating element 6 in the main body 1 of the protective patch is replaceable, and the same patient can continue to use it after the heating element 6 is replaced.

[0049] The above embodiments are only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the scope of protection of this utility model.

Claims

1. A self-heating foot pressure ulcer protective patch, characterized in that: The device includes a protective patch body (1), a connecting piece (2), a heating element (6), and an anti-pressure plate (7). The protective patch body (1) is worn on the patient's foot. The protective patch body (1) includes a left side piece and a right side piece. One end of the connecting piece (2) is fixed to the left side piece, and the other end is detachably connected to the right side piece through a quick-release component (3) set on the right side piece. The heating element (6) is detachably set on the protective patch body (1) and corresponds to the patient's sole and heel. The heating element (6) automatically generates heat to provide heat to the patient's foot. The anti-pressure plate (7) is detachably set on the protective patch body (1) and close to the patient's ankle to relieve pressure on the ankle.

2. The self-heating foot pressure ulcer protective patch according to claim 1, characterized in that: The main body (1) of the protective patch includes an ankle protection part (11) and a foot protection part (12). The ankle protection part (11) and the foot protection part (12) are connected. The ankle protection part (11) covers the patient's ankle and the foot protection part (12) covers the patient and the foot.

3. The self-heating foot pressure ulcer protective patch according to claim 1, characterized in that: The connecting piece (2) includes a first connecting piece (21), a second connecting piece (22) and a third connecting piece (23). The first connecting piece (21) is located at the ankle protection part (11) in the protective patch body (1), the third connecting piece (23) is located at the foot protection part (12) in the protective patch body (1), and the second connecting piece (22) is located between the first connecting piece (21) and the third connecting piece (23).

4. The self-heating foot pressure ulcer protective patch according to claim 3, characterized in that: The connecting piece (2) is made of elastic fabric, such as spandex blend and Lycra.

5. The self-heating foot pressure ulcer protective patch according to claim 1, characterized in that: The heating component (6) includes a self-heating heating pack (61) with a gel thermal conductive layer (62) disposed on the side of the heating pack (61) near the heating pack (61).

6. The self-heating foot pressure ulcer protective patch according to claim 1, characterized in that: The quick-put-on and take-off assembly (3) includes a connecting buckle (31), a connecting block (32), and an mounting block (33). The mounting block (33) is fixed on the right side plate, the connecting buckle (31) is set on the connecting plate (2), and the connecting block (32) is set inside the mounting block (33). The connecting buckle (31) and the connecting block (32) are connected in cooperation.

7. The self-heating foot pressure ulcer protective patch according to claim 6, characterized in that: An inlet (35) and a limiting port (37) are provided on the connecting block (32). The size of the inlet (35) is larger than that of the limiting port (37). The connecting buckle (31) is inserted into the connecting block (32) from the inlet (35) and is engaged with the limiting port (37) for limiting.

8. The self-heating foot pressure ulcer protective patch according to claim 6, characterized in that: A tension adjustment mechanism (4) is provided inside the mounting block (33). The tension adjustment mechanism (4) includes a pull rope (41), a ratchet and pawl mechanism (42), and an adjustment knob (5). One end of the pull rope (41) is connected to the connecting block (32), and the other end is wrapped around the adjustment knob (5). The pull rope (41) can controllably pull the connecting block (32) to move inside the mounting block (33). The ratchet and pawl mechanism (42) is connected to the adjustment knob (5), and the ratchet and pawl mechanism (42) restricts the rotation direction of the adjustment knob (5).

9. The self-heating foot pressure ulcer protective patch according to claim 8, characterized in that: The adjustment knob (5) includes a winding rod (51), a base plate (52), a top cover (53), an outer sleeve (54), and a return spring (57). The winding rod (51) is set on the base plate (52). One end of the outer sleeve (54) is fitted onto the base plate (52). The top cover (53) closes the other end of the outer sleeve (54). The return spring (57) is set inside the outer sleeve (54) and located between the base plate (52) and the top cover (53). When the outer sleeve (54) is pressed, the return spring (57) is compressed, and the outer sleeve (54) contacts the unlocking piece (43) on the pawl in the ratchet and pawl mechanism (42), releasing the limit of the ratchet and pawl mechanism (42).

10. The self-heating foot pressure ulcer protective patch according to claim 1, characterized in that: The anti-pressure sheet (7) is made of a material with a certain degree of elasticity, such as silicone foam and polyurethane foam.

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