A cold compress device for orthopedic care

Abstract

The application belongs to the technical field of medical apparatus and specifically discloses a cold compress device for orthopedic nursing, which comprises a refrigeration circulating pump group, a pumping pipe and a pumping-out pipe are arranged on the refrigeration circulating pump group, a positive pressure cylinder is in communication with the top of the pumping pipe, a negative pressure cylinder is in communication with the top of the pumping-out pipe, a wrapping pad is arranged on the top of the positive pressure cylinder and the negative pressure cylinder, a pipeline system is arranged on the wrapping pad to finally realize the communication with the refrigeration circulating pump group, and a slide valve switching mechanism for controlling the refrigerant flow is arranged in the positive pressure cylinder and the negative pressure cylinder. The rotating hole valve in the positive pressure cylinder and the negative pressure cylinder is synchronously driven by the servo motor, the specific angle phase difference between the rotating hole valve and the fixed hole valve is utilized, and the flow area of the refrigerant into and out of the first and second cavities of the wrapping pad is periodically changed during rotation, so that the two cavities alternately appear in the state of the inflow being greater than the outflow (expansion) and the outflow being greater than the inflow (contraction), the cold compress and the alternating massage are combined into one by using a single refrigerant circuit, the device is highly integrated, and the thrombus is effectively prevented.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically referring to a cold compress device for orthopedic care. Background Technology

[0002] In the orthopedic trauma and postoperative rehabilitation phase, affected areas (such as the knee joint and lower limbs) are often accompanied by severe tissue edema, aseptic inflammation, and local bleeding. Cryotherapy, as the preferred physical intervention in clinical practice, can effectively reduce the local tissue metabolic rate, constrict capillaries, and relieve pain. Currently, conventional orthopedic cold compress devices typically employ a closed-loop thermodynamic system, which uses an integrated refrigeration circulation pump unit to continuously pump liquid or gaseous refrigerant into a flexible pad that adheres to the affected limb, utilizing heat conduction to achieve local cooling. However, existing static cold compress devices have revealed several shortcomings in long-term clinical application, specifically in the following two aspects: First, orthopedic patients often require prolonged bed rest after surgery, which already slows venous blood return in the affected limb. Traditional cold compresses exert continuous static physical pressure on the affected limb during operation; simultaneously, the prolonged low temperature environment further leads to deep vasoconstriction in local microvessels. This combined effect of static pressure and continuous low temperature easily causes microcirculatory disturbances and venous blood stasis in the affected limb, significantly increasing the risk of serious complications such as deep vein thrombosis in the lower extremities.

[0003] Secondly, to alleviate the aforementioned risk of thrombosis, intermittent pneumatic compression and other physical massage techniques are often introduced clinically to promote blood return. However, in existing equipment architectures, the cooling system and the massage system are often two separate physical entities. The conventional approach is to additionally strap or attach a separate electric massager and airbag array to the outside of the cooling pad. This layered design has several drawbacks: firstly, the system integration is extremely low, requiring two independent systems (a cooling circulation pump and a massage drive) and control circuits, significantly increasing the manufacturing cost and subsequent clinical maintenance difficulty; secondly, the multiple layers of physical wrapping severely increase thermal resistance, reducing the heat exchange efficiency of the refrigerant; and thirdly, the redundant mechanical structure not only increases the operational burden on medical staff but also reduces patient comfort. Summary of the Invention

[0004] To address the above issues, this invention provides a cold compress device for orthopedic care. It utilizes a servo motor to synchronously drive rotating orifice valves within positive and negative pressure cylinders. Based on a specific angular phase difference between the rotating orifice valve and the fixed orifice valve, the flow cross-sectional area of ​​the refrigerant entering and exiting the first and second chambers of the wrapping pad is periodically changed during rotation. This causes the two chambers to alternately experience states where the inflow is greater than the outflow (expansion) and the outflow is greater than the inflow (contraction). A single refrigerant circuit is used to combine cold compresses and alternating massage into one highly integrated device, effectively preventing thrombosis.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a cold compress device for orthopedic nursing, including a refrigeration circulation pump group, wherein the refrigeration circulation pump group is provided with a pumping pipe and a pumping pipe, a positive pressure cylinder is connected above the pumping pipe, a negative pressure cylinder is connected above the pumping pipe, a wrapping pad is provided above the positive pressure cylinder and the negative pressure cylinder, and a pipeline system is provided on the wrapping pad to ultimately achieve connection with the refrigeration circulation pump group.

[0006] Furthermore, the positive pressure cylinder has a first transfer input cylinder and a second transfer input cylinder coaxially arranged at its front and rear ends, respectively, and the negative pressure cylinder has a first transfer suction cylinder and a second transfer suction cylinder coaxially arranged at its front and rear ends, respectively.

[0007] Furthermore, a first rotating shaft is coaxially inserted inside the positive pressure cylinder, and a first input disk and a second input disk are coaxially fixed at the front and rear ends of the first rotating shaft, respectively. A second rotating shaft is coaxially inserted inside the negative pressure cylinder, and a first suction disk and a second suction disk are coaxially fixed at the front and rear ends of the second rotating shaft, respectively.

[0008] Furthermore, the positive pressure cylinder and the negative pressure cylinder are provided with a sliding valve switching mechanism for controlling the refrigerant flow, and a drive mechanism for synchronously driving the first rotating shaft and the second rotating shaft is provided between the positive pressure cylinder and the negative pressure cylinder.

[0009] Furthermore, the wrapping pad includes two connected but internally independent first and second chambers.

[0010] Furthermore, the piping system includes a first input hose, a second input hose, a first return hose, and a second return hose. The two ends of the first input hose are respectively connected to a first transfer input cylinder and a first chamber. The two ends of the first return hose are respectively connected to a first transfer suction cylinder and a first chamber. The two ends of the second input hose are respectively connected to a second transfer input cylinder and a second chamber. The two ends of the second return hose are respectively connected to a second transfer suction cylinder and a second chamber.

[0011] Furthermore, the first input disc and the second input disc are respectively sealed and tightly attached to the inner walls of the front and rear ends of the positive pressure cylinder, the first suction disc and the second suction disc are respectively sealed and tightly attached to the inner walls of the front and rear ends of the negative pressure cylinder, and the pumping pipe and the pumping pipe are respectively connected and arranged on the side walls of the positive pressure cylinder and the negative pressure cylinder.

[0012] Furthermore, the drive mechanism includes a servo motor disposed between the positive pressure cylinder and the negative pressure cylinder. The output end of the servo motor is fixedly provided with a drive sprocket. The end of the first rotating shaft seal extending out of the first intermediate input cylinder and the end of the second rotating shaft seal extending out of the first intermediate suction cylinder are both coaxially fixedly provided with driven sprockets. The drive sprocket and the two driven sprockets are together fitted with a chain.

[0013] Furthermore, the slide valve switching mechanism includes rotary orifice valves that pass through the first input plate, the second input plate, the first suction plate, and the second suction plate respectively; it also includes fixed orifice valves that pass through the connecting wall between the positive pressure cylinder and the first transfer input cylinder and the second transfer input cylinder, and the connecting wall between the negative pressure cylinder and the first transfer suction cylinder and the second transfer suction cylinder respectively.

[0014] Furthermore, the fixed-hole valve and the rotary-hole valve have the same shape and size, and both consist of an arc-shaped hole located in the center and a semi-circular hole connecting the two ends of the arc-shaped hole. The arc-shaped hole has a central angle of 90 degrees. From a perspective perpendicular to the fixed-hole valve, the angular distribution of all fixed-hole valves is the same.

[0015] Furthermore, from a perspective perpendicular to the rotary valve, the angular intervals of the rotary valves on the first input disk and the second input disk differ by 180 degrees, the angular intervals of the rotary valves on the first suction disk and the second suction disk differ by 180 degrees, and the angular intervals of the rotary valves on the first input disk and the first suction disk differ by 180 degrees; under the synchronous transmission of the chain, the angular position deviation of all rotary valves remains constant.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: (1) This invention creatively introduces a dynamic fluid distribution mechanism, using positive pressure cylinders and negative pressure cylinders as fluid pressure stabilizing sources. Through the specific angular phase difference between the rotary orifice valve and the fixed orifice valve in the internal slide valve switching mechanism, the flow cross-sectional area of ​​the refrigerant entering and exiting the first and second chambers is periodically changed when the shaft rotates. When the liquid inflow into the first chamber is greater than the suction flow, its volume expands to form pressure; simultaneously, when the liquid inflow into the second chamber is less than the suction flow, its volume contracts to release pressure; then the process reverses. This purely mechanical fluid modulation transforms the originally stable refrigerant into a pulsating flow. While continuously applying cold compresses, it forms regular alternating physical pressure and release on the two parts of the affected limb, greatly promoting venous blood return and eliminating the risk of complications caused by static pressure combined with continuous low temperature.

[0017] (2) This device does not require any external independent airbag array or pneumatic pump group. Instead, it directly uses the refrigerant output by the refrigeration cycle pump group as the hydraulic power source. The first chamber and the second chamber are both the cold compress carrier for heat exchange of the refrigerant and the massage execution chamber for volume expansion and contraction. This highly integrated design not only greatly reduces the manufacturing cost and mechanical redundancy of the device, but also eliminates the thermal resistance caused by multiple layers of physical wrapping, so that the refrigerant can be closest to the skin of the affected limb for efficient heat conduction, thereby improving the clinical cold therapy effect and the patient's wearing comfort.

[0018] (3) The entire complex fluid distribution and alternating massage cycle is automatically completed by the servo motor in the drive mechanism through the chain to drive the two rotating shafts to rotate synchronously. In clinical use, medical staff do not need to deal with the cumbersome multi-valve control circuit. They only need to issue a single speed command to the servo motor to automatically complete the entire alternating massage cycle. Furthermore, by simply adjusting the speed of the servo motor, the stepless adjustment of the massage frequency can be achieved very conveniently, thereby matching the personalized nursing needs of different patients at different stages of rehabilitation and improving the reliability and ease of use of the equipment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a cold compress device for orthopedic care proposed in this invention.

[0020] Figure 2 This is a front view of a cold compress device for orthopedic care proposed in this invention.

[0021] Figure 3 This is a schematic diagram showing the positional relationship between the positive and negative pressure cylinders of a cold compress device for orthopedic care proposed in this invention.

[0022] Figure 4 This is a schematic diagram of the piping system of a cold compress device for orthopedic care proposed in this invention.

[0023] Figure 5 This is an exploded structural diagram showing the positional relationship between the positive pressure cylinder and the first transfer input cylinder of a cold compress device for orthopedic nursing proposed in this invention.

[0024] Figure 6 This is an exploded structural diagram showing the positional relationship between the positive pressure cylinder and the first rotating shaft of a cold compress device for orthopedic nursing proposed in this invention.

[0025] Figure 7 This is a schematic diagram showing the positional relationship between the arc-shaped hole and the semi-circular hole in an orthopedic nursing cold compress device proposed in this invention.

[0026] Figure 8 This is a diagram showing the location distribution of the fixing hole valve in an orthopedic nursing cold compress device proposed in this invention.

[0027] Among them, 1. Refrigeration cycle pump set, 11. Pumping pipe, 12. Pumping pipe, 13. Positive pressure cylinder, 14. Negative pressure cylinder, 2. Wrapping pad, 21. First chamber, 22. Second chamber, 3. First rotating shaft, 31. First input plate, 32. Second input plate, 33. First transfer input cylinder, 34. Second transfer input cylinder, 4. Second rotating shaft, 41. First suction plate, 42. Second suction plate, 43. First transfer suction cylinder, 44. Second transfer suction cylinder, 5. Slide valve switching mechanism, 51. Rotary orifice valve, 52. Fixed orifice valve, 53. Arc-shaped hole, 54. Semi-circular hole, 6. Drive mechanism, 61. Servo motor, 62. Drive sprocket, 63. Driven sprocket, 64. Chain, 7. Piping system, 71. First input hose, 72. Second input hose, 73. First return hose, 74. Second return hose.

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the present invention proposes a cold compress device for orthopedic care, the basic structure of which includes a refrigeration circulation pump group 1, which serves as the cold source and power source of the entire system, and is equipped with a pumping pipe 11 for pressurized output of low-temperature refrigerant and a pumping pipe 12 for refrigerant retraction.

[0032] To achieve precise distribution and modulation of the refrigerant, a positive pressure cylinder 13 is connected above the pumping pipe 11, and a negative pressure cylinder 14 is connected above the pumping pipe 12. The technical effect of the positive pressure cylinder 13 and the negative pressure cylinder 14 is to transform the continuous fluid output by the refrigeration cycle pump group 1 into a positive pressure energy storage chamber and a negative pressure back suction chamber with stable pressure. A wrapping pad 2 is provided above the positive pressure cylinder 13 and the negative pressure cylinder 14, and a pipeline system 7 is provided on the wrapping pad 2 to ultimately achieve connection with the refrigeration cycle pump group 1.

[0033] Specifically, the wrapping pad 2 includes two connected and internally independent first chambers 21 and second chambers 22. In the initial normal wrapping state, the first chamber 21 and the second chamber 22 each occupy half of the area. Together, they can completely wrap the entire affected area (such as the knee joint or calf). The function of this dual-chamber independent design is to form independent alternating physical changes.

[0034] In terms of the fluid distribution structure, the front and rear ends of the positive pressure cylinder 13 are respectively provided with a first transfer input cylinder 33 and a second transfer input cylinder 34 on the same axis; similarly, the front and rear ends of the negative pressure cylinder 14 are respectively provided with a first transfer suction cylinder 43 and a second transfer suction cylinder 44 on the same axis.

[0035] To control the flow of refrigerant between the cylinders, a first rotating shaft 3 is coaxially inserted inside the positive pressure cylinder 13. A first input disc 31 and a second input disc 32 are coaxially fixed at the front and rear ends of the first rotating shaft 3, respectively, and the first input disc 31 and the second input disc 32 are respectively sealed and tightly attached to the inner walls of the front and rear ends of the positive pressure cylinder 13. A second rotating shaft 4 is coaxially inserted inside the negative pressure cylinder 14. A first suction disc 41 and a second suction disc 42 are coaxially fixed at the front and rear ends of the second rotating shaft 4, respectively, and the first suction disc 41 and the second suction disc 42 are respectively sealed and tightly attached to the inner walls of the front and rear ends of the negative pressure cylinder 14. The pumping pipe 11 and the pumping pipe 12 are respectively connected and arranged on the side walls of the positive pressure cylinder 13 and the negative pressure cylinder 14.

[0036] The piping system 7 includes a first input hose 71, a second input hose 72, a first return hose 73, and a second return hose 74. The two ends of the first input hose 71 are connected to the first transfer input cylinder 33 and the first chamber 21, respectively. The two ends of the first return hose 73 are connected to the first transfer suction cylinder 43 and the first chamber 21, respectively. The two ends of the second input hose 72 are connected to the second transfer input cylinder 34 and the second chamber 22, respectively. The two ends of the second return hose 74 are connected to the second transfer suction cylinder 44 and the second chamber 22, respectively.

[0037] Furthermore, the positive pressure cylinder 13 and the negative pressure cylinder 14 are provided with a slide valve switching mechanism 5 for controlling the refrigerant flow, and a drive mechanism 6 for synchronously driving the first rotating shaft 3 and the second rotating shaft 4 to rotate is provided between the positive pressure cylinder 13 and the negative pressure cylinder 14.

[0038] Specifically, the drive mechanism 6 includes a servo motor 61 located between the positive pressure cylinder 13 and the negative pressure cylinder 14. The output end of the servo motor 61 is fixedly equipped with a drive sprocket 62. One end of the first rotating shaft 3 that extends out of the first transfer input cylinder 33 and the other end of the second rotating shaft 4 that extends out of the first transfer suction cylinder 43 are both coaxially fixedly equipped with driven sprockets 63. The drive sprocket 62 and the two driven sprockets 63 are all fitted with a chain 64. The technical effect of using the chain 64 transmission mechanism is that it can ensure that the first rotating shaft 3 and the second rotating shaft 4 are synchronized under any working condition, thereby ensuring the precise control of the slide valve phase.

[0039] The slide valve switching mechanism 5 includes a rotary orifice valve 51 that passes through the first input plate 31, the second input plate 32, the first suction plate 41, and the second suction plate 42 respectively; and a fixed orifice valve 52 that passes through the connecting wall between the positive pressure cylinder 13 and the first transfer input cylinder 33 and the second transfer input cylinder 34, and the connecting wall between the negative pressure cylinder 14 and the first transfer suction cylinder 43 and the second transfer suction cylinder 44 respectively.

[0040] The geometric shape and spatial phase design of the rotary orifice valve 51 and the fixed orifice valve 52 are as follows: The fixed orifice valve 52 and the rotary orifice valve 51 have the same shape and size, and both are composed of an arc-shaped hole 53 located in the middle and centered, and a semi-circular hole 54 connecting the two ends of the arc-shaped hole 53. The central angle of the arc-shaped hole 53 is 90 degrees. From the perspective perpendicular to the fixed orifice valve 52, the angular distribution position of all fixed orifice valves 52 is the same.

[0041] From a perspective perpendicular to the rotary valve 51, the angular intervals of the rotary valves 51 on the first input disk 31 and the second input disk 32 differ by 180 degrees, the angular intervals of the rotary valves 51 on the first suction disk 41 and the second suction disk 42 differ by 180 degrees, and the angular intervals of the rotary valves 51 on the first input disk 31 and the first suction disk 41 differ by 180 degrees. Under the synchronous transmission of the chain 64, the angular position deviation of all rotary valves 51 remains constant.

[0042] The specific work process is as follows: The macroscopic principle of this device is as follows: the refrigerant pressed into the positive pressure cylinder 13 is controlled to enter the first transfer input cylinder 33 and the second transfer input cylinder 34 respectively, and correspondingly enters the first chamber 21 and the second chamber 22; at the same time, the negative pressure cylinder 14 controls the suction of refrigerant in the first transfer suction cylinder 43 and the second transfer suction cylinder 44, thereby extracting the refrigerant in the corresponding chamber. Under normal conditions, it is a dynamic balance of pressing and extracting, but in this invention, the sliding valve switching mechanism 5 breaks this balance, so that only the first chamber 21 is pressurized. When suction is reduced, the volume of the first chamber 21 increases and the pressure rises; at the same time, when the refrigerant is reduced and suction is increased, the volume of the second chamber 22 decreases and the pressure drops, and vice versa. Thus, while the refrigerant continues to circulate, alternating pressure and release are achieved on the two parts of the affected area. Due to the specific 180-degree phase difference between each rotary valve 51 and the 90-degree arc of the arc-shaped orifice 53, extremely regular flow changes will occur during the 360-degree complete cycle of the servo motor 61 driving the shaft to rotate.

[0043] Critical equilibrium state: When the servo motor 61 rotates to a specific angle, the arc-shaped hole 53 on the first input disk 31 and the arc-shaped hole 53 of the fixed hole valve 52 on the wall of the first transfer input cylinder 33 are spatially offset by 90 degrees. At this time, the main parts of the two arc-shaped holes 53 do not overlap, but the semi-circular hole 54 at one end of the rotating hole valve 51 and the semi-circular hole 54 at the other end of the fixed hole valve 52 are aligned, forming a complete and connected circular channel. At this instant, due to the aforementioned 180-degree phase difference setting, the rotating hole valve 51 on the second input disk 32, the first suction disk 41, and the second suction disk 42 and their corresponding fixed hole valve 52 are all in this critical state of "only the semi-circular holes 54 are aligned to form a circle". At this time, the flow cross-sectional area of ​​the four channels is completely equal, and the liquid inflow and outflow of the first chamber 21 and the second chamber 22 reach dynamic balance, and are all in the reference pressure state of normal connection.

[0044] Rotation process from 0 to 180 degrees (expansion of the first chamber 21, contraction of the second chamber 22): After exceeding the critical point, rotation continues. The arc-shaped hole 53 of the first input disc 31 gradually overlaps with the corresponding fixed-hole valve 52, forming an increasingly larger flow channel. This means that the refrigerant flow rate supplied from the first transfer input cylinder 33 to the first chamber 21 continuously increases. Simultaneously, due to the 180-degree phase difference, the overlapping area of ​​the semi-circular hole 54 on the first suction disc 41 and the corresponding fixed-hole valve 52 decreases (until completely offset and closed). This means that the suction capacity of the negative pressure cylinder 14 on the first chamber 21 decreases sharply. The excess inflow and insufficient outflow cause the first chamber 21 to rapidly expand, compressing the affected limb. Simultaneously, the second input disc... As the overlapping area of ​​the semicircular hole 54 on the second chamber 32 and the corresponding fixed hole valve 52 decreases, less and less refrigerant is injected into the second chamber 22. Meanwhile, the overlapping area of ​​the arc-shaped hole 53 on the second suction cup 42 and the corresponding fixed hole valve 52 increases, and the suction volume of the second chamber 22 increases sharply. The inflow of less and outflow of more causes the second chamber 22 to shrink rapidly, releasing pressure on the affected limb. When the rotation reaches 90 degrees, the flow rate difference between the inflow of the first chamber 21 and the flow rate difference between the outflow of the second chamber 22 reaches its maximum value. Subsequently, the flow rate difference begins to decrease, but the first chamber 21 still increases while the second chamber 22 decreases. When the rotation continues to 180 degrees, it returns to the second critical equilibrium state of "only the semicircular holes 54 are aligned to form a perfect circle".

[0045] 180-degree to 360-degree rotation process (first chamber 21 contracts, second chamber 22 expands): In the next 180-degree rotation, the physical process is completely reversed. The channel of the first input plate 31 is closed, the channel of the first suction plate 41 gradually increases, the first chamber 21 changes from more inflow than outflow to less inflow than outflow, and its volume begins to decrease, releasing pressure on the affected limb; at the same time, the channel of the second input plate 32 gradually increases, the channel of the second suction plate 42 is closed, the second chamber 22 changes from less inflow than outflow to more inflow than outflow, and its volume begins to increase, compressing the affected limb. When the rotation reaches 360 degrees, a complete alternating massage cycle is completed, and the massage frequency can be achieved by controlling the rotation speed of the servo motor 61.

[0046] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0048] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cold compress device for orthopedic care, comprising a refrigeration circulation pump unit (1), wherein the refrigeration circulation pump unit (1) is provided with a pumping pipe (11) and a pumping pipe (12), characterized in that: A positive pressure cylinder (13) is connected above the pumping pipe (11), and a negative pressure cylinder (14) is connected above the pumping pipe (12). A wrapping pad (2) is provided above the positive pressure cylinder (13) and the negative pressure cylinder (14). A pipeline system (7) is provided on the wrapping pad (2) to ultimately achieve connection with the refrigeration cycle pump group (1). The positive pressure cylinder (13) has a first transfer input cylinder (33) and a second transfer input cylinder (34) coaxially arranged at its front and rear ends, respectively. The negative pressure cylinder (14) has a first transfer suction cylinder (43) and a second transfer suction cylinder (44) coaxially arranged at its front and rear ends, respectively. The positive pressure cylinder (13) is coaxially connected to a first rotating shaft (3), and a first input disk (31) and a second input disk (32) are coaxially fixed at the front and rear ends of the first rotating shaft (3), respectively. The negative pressure cylinder (14) is coaxially connected to a second rotating shaft (4), and a first suction disk (41) and a second suction disk (42) are coaxially fixed at the front and rear ends of the second rotating shaft (4), respectively. The positive pressure cylinder (13) and the negative pressure cylinder (14) are provided with a sliding valve switching mechanism (5) for controlling the refrigerant flow. A drive mechanism (6) for synchronously driving the first rotating shaft (3) and the second rotating shaft (4) is provided between the positive pressure cylinder (13) and the negative pressure cylinder (14).

2. The orthopedic nursing cold compress device according to claim 1, characterized in that: The wrapping pad (2) includes two connected and internally independent first chambers (21) and second chambers (22).

3. The orthopedic nursing cold compress device according to claim 2, characterized in that: The piping system (7) includes a first input hose (71), a second input hose (72), a first return hose (73), and a second return hose (74). The two ends of the first input hose (71) are connected to the first transfer input cylinder (33) and the first chamber (21), respectively. The two ends of the first return hose (73) are connected to the first transfer suction cylinder (43) and the first chamber (21), respectively. The two ends of the second input hose (72) are connected to the second transfer input cylinder (34) and the second chamber (22), respectively. The two ends of the second return hose (74) are connected to the second transfer suction cylinder (44) and the second chamber (22), respectively.

4. The orthopedic nursing cold compress device according to claim 3, characterized in that: The first input disk (31) and the second input disk (32) are respectively sealed and tightly attached to the inner walls of the front and rear ends of the positive pressure cylinder (13), the first suction disk (41) and the second suction disk (42) are respectively sealed and tightly attached to the inner walls of the front and rear ends of the negative pressure cylinder (14), and the pumping pipe (11) and the pumping pipe (12) are respectively connected and arranged on the side walls of the positive pressure cylinder (13) and the negative pressure cylinder (14).

5. A cold compress device for orthopedic care according to claim 4, characterized in that: The drive mechanism (6) includes a servo motor (61) located between the positive pressure cylinder (13) and the negative pressure cylinder (14). The output end of the servo motor (61) is fixedly provided with a drive sprocket (62). The end of the first rotating shaft (3) that extends out of the first transfer input cylinder (33) and the end of the second rotating shaft (4) that extends out of the first transfer suction cylinder (43) are both fixedly provided with driven sprockets (63) on the same axis. The drive sprocket (62) and the two driven sprockets (63) are together fitted with a chain (64).

6. A cold compress device for orthopedic care according to claim 5, characterized in that: The slide valve switching mechanism (5) includes a rotary orifice valve (51) that passes through the first input plate (31), the second input plate (32), the first suction plate (41), and the second suction plate (42); and a fixed orifice valve (52) that passes through the connecting wall between the positive pressure cylinder (13) and the first transfer input cylinder (33) and the second transfer input cylinder (34), and the connecting wall between the negative pressure cylinder (14) and the first transfer suction cylinder (43) and the second transfer suction cylinder (44).

7. A cold compress device for orthopedic care according to claim 6, characterized in that: The fixed-hole valve (52) and the rotary-hole valve (51) have the same shape and size, and both are composed of an arc-shaped hole (53) located in the middle and centered, and a semi-circular hole (54) connecting the two ends of the arc-shaped hole (53). The arc-shaped hole (53) has a central angle of 90 degrees. From a perspective perpendicular to the fixed-hole valve (52), the angular distribution positions of all fixed-hole valves (52) are the same.

8. A cold compress device for orthopedic care according to claim 7, characterized in that: From a perspective perpendicular to the rotary valve (51), the angular intervals of the rotary valves (51) on the first input disk (31) and the second input disk (32) differ by 180 degrees, the angular intervals of the rotary valves (51) on the first suction disk (41) and the second suction disk (42) differ by 180 degrees, and the angular intervals of the rotary valves (51) on the first input disk (31) and the first suction disk (41) differ by 180 degrees; under the synchronous transmission of the chain (64), the angular position deviation of all rotary valves (51) remains constant.

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