Device for preventing venous thrombosis of lower limbs

Abstract

The present application relates to the technical field of rehabilitation therapy apparatus, and discloses a device for preventing lower limb venous thrombosis, which comprises an inner sleeve layer, an outer sleeve layer and a gas bag arranged therebetween, and can be wound around the legs of a patient as a whole. The gas bag is connected with a gas pump and an air outlet, and is provided with a throttling ring inside and is separated to form independent air chambers. The throttling ring end face structure can make the airflow stay and press, and three groups of gradient aperture designs are matched to compensate for the pressure loss of the air path and realize uniform segmented pressurization. The device is combined into a split type connecting frame by upper and lower layer frames, is matched with a breathable knitted flexible cloth to connect, has a reserved ventilation gap, and can avoid damp and eczema. The frame body is slidingly installed with an adjusting frame and an elastic buffer type massage assembly. The inflation of the gas bag can drive the massage assembly to adhere to the legs for extrusion, and a rotating friction member and an electric control valve group are not needed. Instead, the device relies on continuous ventilation to form peristaltic pressing, simulates muscle contraction, promotes the backflow of lower limb venous blood, has a wear-resistant and durable structure, can adjust the local pressing force as needed, and is suitable for high-risk groups such as bedridden and long-sitting people.

Description

Technical Field

[0001] This invention relates to the field of rehabilitation and physiotherapy equipment technology, specifically to a device for preventing lower extremity deep vein thrombosis. Background Technology

[0002] Deep vein thrombosis (DVT) of the lower extremities is a common vascular disease in clinical practice. High-risk groups include those who are bedridden for extended periods, undergo postoperative immobilization, are elderly, or engage in prolonged sitting. Its onset is primarily related to slow venous blood flow and blood stasis in the lower extremities. Currently, most clinical and home-use preventative devices are intermittent pneumatic pressure devices. These devices apply pressure to the limbs through the periodic inflation and deflation of a balloon, mimicking muscle contraction to promote centripetal blood return and reduce the risk of thrombosis. Existing devices generally employ a segmented balloon series structure, with solenoid valves controlling the inflation and deflation sequence. While this achieves basic pressure massage functions, it still relies on electronically controlled components for intermittent operation, making it difficult to achieve a stable and continuous peristaltic squeezing effect under continuous ventilation.

[0003] Existing inflatable preventative devices mostly use an airflow-driven rotating wheel structure to actuate the airbag, such as the invention patent with authorization announcement number CN1154447273. This not only requires a huge airflow driving force to drive the wheel to rotate, resulting in high energy consumption, but also causes long-term direct friction and compression between the wheel and the airbag, which can easily cause wear and fatigue damage to the airbag wall, reducing the product's service life and safety. Summary of the Invention

[0004] The present invention aims to provide a device for preventing lower extremity venous thrombosis, in order to solve the problem of wear and tear on the airbag caused by the easy wear and tear of the existing airflow driven rotating components.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for preventing lower extremity deep vein thrombosis, comprising an inner sleeve, an outer sleeve, and an air bladder sandwiched between the two, wherein the inner sleeve, air bladder, and outer sleeve are rolled up to wrap around the patient's leg; one end of the air bladder is used to connect to an air pump, and the other end has an air outlet; throttling rings are arranged at intervals inside the air bladder, dividing the air bladder into several air chambers; when inflated, the airflow passes through the throttling rings and forms a local high pressure in the air chamber, driving the air chamber to expand locally; an adjusting frame is slidably arranged on the outer sleeve, and several massage components are arranged on the inner sleeve, with the massage components slidably arranged at the bottom end of the adjusting frame; the massage components are arranged at the bottom end of the air chamber, and the expansion of the air chamber is used to squeeze the massage components against the leg.

[0006] The beneficial effects of this solution are as follows: The device adopts a composite wrapping structure of inner and outer layers, combined with an integrated airbag that fits snugly against the leg, eliminating the need for multiple sets of electrically controlled solenoid valves for timed air control. Relying on the physical zoning and flow restriction of the airbag's internal throttling ring, continuous single-channel ventilation automatically creates stepped local high pressure in each independent air chamber, autonomously achieving continuous wave-like peristaltic compression. This precisely simulates the rhythmic contraction of human muscles, efficiently promoting the centripetal return of venous blood from the lower limbs. The entire process is free of rotating wheels or other friction-prone components, completely eliminating hard friction wear on the airbag, significantly reducing overall energy consumption, and simultaneously improving the structural integrity of the airbag and the overall safety of the device. It is suitable for the long-term anti-thrombotic protection needs of high-risk groups such as those who are bedridden for extended periods, undergo postoperative immobilization, or are elderly and sedentary.

[0007] Preferably, as an improvement, the airbag includes an air inlet chamber, an air outlet chamber, and a plurality of elastic hoses connecting the two, with a throttling ring disposed within the elastic hoses, the air inlet chamber and the air outlet chamber arranged circumferentially along the device, and the elastic hoses extending axially along the sheath.

[0008] The beneficial effects are as follows: by disassembling the airbag into an air inlet chamber and an air outlet chamber, and connecting multiple independent elastic hoses in parallel, the airflow delivery path is regulated, and the airflow is evenly distributed and replenished throughout the entire area; relying on the regular circumferential and axial layout of the device body, it fits and wraps the physiological curve of the leg, avoiding the problems of localized force concentration and poor fit of single-chamber airbags.

[0009] Preferably, as an improvement, the upstream end face of the throttling ring is flat and the downstream end face is conical. The throttling rings in the flexible hose are divided into an upper flow ring group, a middle flow ring group, and a lower flow ring group according to the size of the orifice. Each of the three groups includes several throttling rings with the same inner hole. The orifice diameter of the throttling ring increases sequentially from the upper flow group to the lower flow group.

[0010] The beneficial effects are as follows: The throttling ring adopts a straight-through cylindrical hole structure. The front and rear ends of a single throttling chamber are respectively equipped with matching throttling ring structures. The airflow is blocked by the straight end face of the throttling ring at the end of the chamber, while the airflow is guided by the downstream conical surface of the throttling ring at the front end of the previous stage. During the continuous flow of airflow, the airflow is blocked by the coordinated collision and reversal of the front and rear end faces in the same chamber, which quickly accumulates and forms a pressure buildup. Without the need for electromagnetic valve control and pressure regulation, it can autonomously form an effective internal pressure in the chamber, stably driving the local expansion and pressure application of the airbag. At the same time, the throttling ring is divided into an upper flow ring group, a middle flow ring group, and a lower flow ring group according to the aperture gradient. The aperture increases from top to bottom, which adapts to the natural pressure drop law along the entire airflow path, dynamically balances the pressure intensity of each chamber, and uniformly balances the axial full-area compression massage force of the leg, eliminating the problems of insufficient pressure at the distal end and overload of pressure at the proximal end. It forms an orderly progressive peristaltic compression, ensuring the smooth centripetal return of venous blood and enhancing the overall anti-thrombotic protection effect.

[0011] Preferably, as an improvement, the diameter of the outlet hole is 1 / 2 of the diameter of the inner hole of the throttling ring of the downstream group.

[0012] The beneficial effects are: it will not cause insufficient back pressure in the air chamber or weak peristalsis and squeezing due to excessively fast exhaust, nor will it cause overload of airbag pressure or wear and deformation of components due to excessively slow exhaust.

[0013] Preferably, as an improvement, the device includes several connecting frames arranged circumferentially thereon, the connecting frames being connected by a flexible protective sleeve; the number of connecting frames corresponds to the number of elastic hoses, and the elastic hoses are inserted through and partially fixed to the connecting frames.

[0014] Preferably, as an improvement, the outer layer includes several upper shelves arranged along the circumference of the device, and the upper shelves are connected to each other by a flexible protective sleeve; the inner layer includes several lower shelves arranged along the circumference of the device, and the lower shelves are also connected to each other by a flexible protective sleeve; the upper shelves and lower shelves correspond one-to-one, and the connecting frame is composed of upper shelves and lower shelves.

[0015] The beneficial effects are as follows: The connecting frame is formed by assembling the upper and lower frames together, and is connected circumferentially with a flexible protective sleeve. At the same time, the elastic hoses are inserted one-to-one and limited inside the corresponding connecting frame, which organizes the pipeline layout and effectively prevents the elastic hoses from shifting, twisting, bending and blocking air during operation, ensuring long-term stable and unobstructed airflow. The whole structure adopts a multi-segment split frame combination structure, which is not a completely closed and enclosed structure. There are natural ventilation gaps between the frames, so the legs can directly communicate and circulate with the outside air during massage. The heat dissipation and sweat dissipation effect is good, avoiding complications such as eczema and skin itching caused by long-term closed wrapping of the legs, heat accumulation and sweat, and the inability of moisture to dissipate. It is breathable, dry and comfortable to wear, and has a stronger health and wellness adaptability.

[0016] In addition, based on the patient's actual sensation of local blood stasis and severe local pain during the massage, the local massage support intensity is individually adjusted to precisely relieve local pressure pain, specifically clear the blocked blood stasis, and take into account the stability of equipment assembly, skin protection and clinical comfort.

[0017] Preferably, as an improvement, the outer ring of the flexible hose is fitted with a clamp at the throttling ring; the upper frame includes a semi-circular baffle and a cover plate detachably connected to the top of the baffle; the top of the baffle is open, and the lugs and bolts of the clamp protrude from the baffle and are clamped on both sides by the cover plate.

[0018] The beneficial effects are as follows: the use of clamps at the assembly points of the throttling ring for fixed-point locking and limiting completely eliminates the axial movement and radial displacement of the throttling ring caused by long-term impact from high-speed airflow. The combination structure of baffle and cover plate clamping and locking fully encloses the clamp lugs and bolt connections, preventing loosening and detachment and concealing external hardware components, avoiding the problem of bumps and bruises on the legs when wearing the device, and simultaneously ensuring the long-term stable and reliable operation of the core throttling and pressure regulating components, thus extending the service life of the entire machine.

[0019] Preferably, as an improvement, the baffle has protruding side flanges on both sides, and the adjustment frame is arranged in a square arch shape, including vertical rods on both sides and a horizontal rod at the top. The vertical rods on both sides pass through and are slidably connected to the side flanges, and the horizontal rod is rotatably provided with an adjustment bolt, which is threadedly connected to the cover plate.

[0020] Preferably, as an improvement, the massage component includes two side slide cylinders, a connecting rod connected to the slide cylinders, and a plurality of massage balls rotatably disposed on the connecting rod. The slide cylinders are sleeved and slidably connected to a vertical rod. The vertical rod is provided with an upper retaining ring and a lower retaining ring. A spring is provided between the slide cylinder and the lower retaining ring, and the spring is used to push the slide cylinder against the upper retaining ring.

[0021] The beneficial effects are as follows: the spring and the slide cylinder form an elastic buffer structure, which can flexibly release and buffer the pressure when the airbag expands, avoiding local pressure pain caused by hard compression and improving the comfort of use; after the airbag is depressurized, the spring automatically rebounds and resets, ensuring that the massage components return to their position quickly.

[0022] Preferably, as an improvement, the flexible protective sleeve is made of breathable and abrasion-resistant knitted flexible fabric.

[0023] Beneficial effects include: the fabric is highly resilient, tensile, and fold-resistant, and is not easily damaged or aged even after repeated bending over a long period of time. The fabric itself has dense, breathable micropores, providing excellent heat dissipation and moisture wicking properties. When massaging, generating heat, or sweating, it can quickly wick away moisture and ventilate, preventing the legs from becoming stuffy and prone to eczema. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the unfolded state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the airbag structure according to an embodiment of the present invention; Figure 3 This is a longitudinal cross-sectional schematic diagram of the airbag structure according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the airbag structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the connecting frame structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the upper shelf structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the flexible hose installed on the upper shelf according to an embodiment of the present invention; Figure 8 This is an embodiment of the present invention. Figure 7 A schematic diagram of the longitudinal section; Figure 9 This is a schematic diagram of the structure of the upper shelf, flexible hose, and connecting frame installed in accordance with an embodiment of the present invention; Figure 10 This is an embodiment of the present invention. Figure 9 A schematic diagram of the longitudinal section. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: inner layer 1, lower shelf 11, outer layer 2, upper shelf 21, baffle 211, edge 2111, cover 212, airbag 3, elastic hose 31, clamp 311, air inlet 32, air outlet 33, air outlet 331, throttling ring 34, air chamber 35, connecting frame 4, adjusting frame 5, vertical rod 51, upper retaining ring 511, lower retaining ring 512, spring 513, horizontal rod 52, adjusting bolt 521, massage component 6, slide cylinder 61, connecting rod 62, massage ball 63.

[0026] Example The basic implementation examples are as follows: Figures 1-10 As shown, Figure 1 The device shown is for preventing lower extremity deep vein thrombosis. It mainly consists of an inner sleeve 1, an outer sleeve 2, an airbag 3, an adjustment frame 5, and a massage component 6. The inner sleeve 1 and the outer sleeve 2 work together to wrap around and cover the patient's legs. The airbag 3 is sandwiched between the two layers to form an integrated wearable protective structure.

[0027] like Figures 2-4 As shown, the airbag 3 includes an air inlet chamber 32, an air outlet chamber 33, and multiple flexible hoses 31. The air inlet chamber 32 and the air outlet chamber 33 are arranged circumferentially along the device. The multiple flexible hoses 31 are evenly arranged along the leg axis and connect the two chambers. Each flexible hose 31 is equipped with a throttling ring 34. The throttling rings 34 are distributed at intervals along the tube body, dividing the interior of the flexible hose 31 into independent air chambers 35. The throttling rings 34 are uniformly provided with an upstream straight end face and a downstream conical surface, and are divided into an upper flow ring group, a middle flow ring group, and a lower flow ring group according to their installation positions. The inner diameter of the three groups of throttling rings 34 increases sequentially. An air outlet 331 is opened at the end of the air outlet chamber 33. The diameter of the air outlet 331 is limited to half of the inner diameter of the lower flow group throttling ring 34.

[0028] like Figures 6-8As shown, multiple sets of connecting frames 4 are evenly arranged around the circumference of the device. Each connecting frame 4 is assembled from an upper frame 21 and a lower frame 11 that cooperate with each other. The upper frame 21 is located at the outer layer 2, and the lower frame 11 is correspondingly located at the inner layer 1. Adjacent connecting frames 4 are connected and fixed by a breathable and wear-resistant knitted flexible fabric. Elastic hoses 31 are inserted one-to-one inside the connecting frame 4 to achieve limiting and fixing, preventing the pipeline from shifting or bending. The upper frame 21 is equipped with a semi-circular baffle 211. The top of the baffle 211 is fitted with a detachable cover plate 212 to complete the assembly. The elastic hose 31 is fitted with a clamp 311 on the outside of the throttling ring 34. The connecting lugs and bolts of the clamp 311 protrude from the opening of the baffle 211 and are clamped and limited by the cover plate 212 to prevent the throttling ring 34 from shifting due to airflow impact.

[0029] like Figure 5 , Figures 9-10 As shown, the baffle 211 has integrally formed flanges 2111 on both sides. The square arched adjustment frame 5 is slidably mounted between the flanges 2111 via the vertical rods 51 on both sides. The top horizontal rod 52 of the adjustment frame 5 is equipped with an adjustment bolt 521, which is threadedly engaged with the cover plate 212. Massage components 6 are evenly distributed on the side of the inner sleeve layer 1 corresponding to the positions of each air chamber 35. The massage components 6 are slidably mounted on the outside of the vertical rod 51 via the sliding cylinders 61 on both sides. An upper retaining ring 511 and a lower retaining ring 512 are set on the vertical rod 51. A spring 513 is installed between the sliding cylinder 61 and the lower retaining ring 512. Under normal conditions, the spring 513 presses the sliding cylinder 61 against the upper retaining ring 511. Multiple massage balls 63 are rotatably mounted in the middle of the connecting rod 62. The massage balls 63 are arranged close to the outside of the leg and are located below the air chamber 35.

[0030] The specific implementation process is as follows: In use, the device is wrapped around the outside of the patient's lower limb. After securing it in place, the air inlet 32 ​​of the airbag 3 is connected to an external air pump. The air pump continuously delivers airflow into the airbag 3, which is evenly distributed into each elastic hose 31 and flows sequentially through each set of throttling rings 34. Within each individual throttling chamber 35, the airflow is blocked and deflected by the straight end faces and conical surfaces of the front and rear throttling rings 34, creating localized high pressure within the independent chamber 35 and causing the airbag 3 to expand in stages. The expanded chambers 35 push the massage components 6 downwards, causing the massage balls 63 to press tightly against the patient's leg, achieving segmented compression massage. Combined with the gradient-set throttling rings 34, the pressure in each chamber 35 is balanced, creating a stable, progressive peristaltic pressing effect.

[0031] Patients can adjust the local pressure by rotating the adjusting bolt 521, which causes the adjusting frame 5 to slide vertically, changing the tightness of the massage component 6. The device, combined with a soft knitted fabric, allows for normal ventilation and heat dissipation in the legs during massage, reducing stuffiness, sweating, and eczema. The gas in the air chamber 35 is eventually discharged at a uniform speed through the end outlet 331, maintaining continuous air circulation. It operates stably without the need for electrically controlled valves, relying on a purely mechanical throttling structure. Long-term use results in frictionless components, effectively preventing lower limb blood stasis and reducing the risk of deep vein thrombosis.

[0032] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A device for preventing lower extremity deep vein thrombosis, characterized in that: It includes an inner layer, an outer layer, and an air bladder sandwiched between the two. The inner layer, air bladder, and outer layer are rolled up to wrap around the patient's legs. One end of the airbag is used to connect to the air pump, and the other end has an air outlet. Throttling rings are arranged at intervals inside the airbag. The throttling rings divide the airbag into several air chambers. When inflating, the airflow passes through the throttling rings and forms a local high pressure in the air chamber, driving the air chamber to expand locally. The outer layer is equipped with an adjustable frame, and the inner layer is equipped with several massage components. The massage components are slidably positioned at the bottom of the adjustable frame. The massage components are located at the bottom of the air chamber, and the expansion of the air chamber is used to squeeze the massage components against the legs.

2. The device for preventing lower extremity deep vein thrombosis according to claim 1, characterized in that: The airbag includes an air inlet chamber, an air outlet chamber, and several elastic hoses connecting the two. A throttling ring is disposed inside the elastic hoses. The air inlet chamber and the air outlet chamber are arranged circumferentially along the device, and the elastic hoses extend axially along the sheath.

3. The device for preventing lower extremity deep vein thrombosis according to claim 1, characterized in that: The upstream end face of the throttling ring is flat, and the downstream end face is conical. The throttling rings in the flexible hose are divided into an upper flow ring group, a middle flow ring group, and a lower flow ring group according to the size of the orifice. Each of the three groups includes several throttling rings with the same inner hole. The inner hole diameter of the throttling ring increases sequentially from the upper flow group to the lower flow group.

4. The device for preventing lower extremity deep vein thrombosis according to claim 3, characterized in that: The diameter of the outlet hole is half the diameter of the inner hole of the throttling ring in the downstream group.

5. The device for preventing lower extremity deep vein thrombosis according to claim 2, characterized in that: The device includes several connecting frames arranged circumferentially thereon, and the connecting frames are connected by a flexible protective sleeve; the number of connecting frames corresponds to the number of flexible hoses, and the flexible hoses are inserted through and partially fixed to the connecting frames.

6. The device for preventing lower extremity deep vein thrombosis according to claim 5, characterized in that: The outer layer includes several upper shelves arranged along the circumference of the device, which are connected by flexible protective sleeves; the inner layer includes several lower shelves arranged along the circumference of the device, which are also connected by flexible protective sleeves; the upper shelves and lower shelves correspond one-to-one, and the connecting frame is composed of upper shelves and lower shelves.

7. The device for preventing lower extremity deep vein thrombosis according to claim 6, characterized in that: The outer ring of the flexible hose is fitted with a clamp at the throttling ring; the upper frame includes a semi-circular baffle and a cover plate detachably connected to the top of the baffle; the top of the baffle is open, and the lugs and bolts of the clamp protrude from the baffle and are clamped on both sides by the cover plate.

8. The device for preventing lower extremity deep vein thrombosis according to claim 7, characterized in that: The baffle has protruding edges on both sides, and the adjustment frame is square arched, including vertical rods on both sides and a horizontal rod at the top. The vertical rods on both sides pass through and are slidably connected to the edges, and the horizontal rod is rotatably equipped with an adjustment bolt, which is threadedly connected to the cover plate.

9. The device for preventing lower extremity deep vein thrombosis according to claim 8, characterized in that: The massage assembly includes two side slide cylinders, a connecting rod connected to the slide cylinders, and several massage balls rotatably mounted on the connecting rods. The slide cylinders are fitted with and slidably connected to a vertical rod. The vertical rod is equipped with an upper retaining ring and a lower retaining ring. A spring is installed between the slide cylinder and the lower retaining ring, and the spring is used to push the slide cylinder against the upper retaining ring.

10. The device for preventing lower extremity deep vein thrombosis according to claim 6, characterized in that: The flexible protective cover is made of breathable and wear-resistant knitted flexible fabric.

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