Postoperative rehabilitation lower extremity venous thrombosis prevention device

Abstract

The postoperative rehabilitation lower extremity venous thrombosis prevention device solves the problem that the existing preset program intermittent air pressure compression device makes the patient participation low, and the single prevention form cannot fully meet the prevention needs of different patients; including a foot control mechanism, a fixing belt assembly and a gas supply pump, the inner side of the fixing belt assembly is fixedly connected with a covering elastic belt, the periphery of the covering elastic belt is fixedly connected with the fixing belt assembly to form a hollow cavity therebetween, a gas bag body is arranged in the hollow cavity, and the gas bag body is communicated with the gas supply pump through a flexible gas supply pipe; the foot control mechanism comprises a positioning plate and a movable plate hinged to the positioning plate, and the swing of the movable plate can control the start and stop of the gas supply pump; the device realizes personalized adjustment and active participation of the patient, improves the treatment enthusiasm and effect, is safe and reliable, convenient to adjust, and has wide application range.

Description

Technical Field

[0001] This utility model belongs to the field of biomedical engineering technology, and in particular relates to a device for preventing lower extremity deep vein thrombosis in postoperative rehabilitation. Background Technology

[0002] With the continuous advancement of medical technology, the demand for prevention of lower extremity deep vein thrombosis (DVT) in postoperative rehabilitation care is increasing. DVT is a common complication of postoperative care, not only affecting the patient's recovery process but also potentially leading to serious consequences such as pulmonary embolism, threatening the patient's life. Therefore, developing efficient, safe, and convenient DVT prevention devices has become a current hot topic in medical research.

[0003] Currently, various devices for preventing lower extremity deep vein thrombosis (DVT) are available on the market, among which intermittent pneumatic compression devices are favored due to their ease of operation and significant effectiveness. However, most existing intermittent pneumatic compression devices use preset program control, meaning the device operates according to pre-set parameters (such as pressure, frequency, and duration), and patients cannot adjust them according to their own circumstances. This preset program control method results in low patient participation, which not only affects patient motivation but may also reduce treatment effectiveness. Furthermore, existing intermittent pneumatic compression devices primarily promote venous blood return in the lower extremities through pneumatic compression to prevent DVT formation. However, this single form of prevention may not fully meet the diverse needs of patients. For example, for some patients, in addition to pneumatic compression, appropriate ankle exercises and other physical therapies may also have a positive impact on their rehabilitation. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a lower extremity deep vein thrombosis prevention device for postoperative rehabilitation, which solves the problems of low patient participation and the inability of a single prevention method to fully meet the prevention needs of different patients caused by existing intermittent pneumatic compression devices with preset programs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a foot pedal control mechanism, a fixing belt assembly, and an air pump. An elastic covering belt is fixedly connected to the inner side of the fixing belt assembly, and the periphery of the elastic covering belt is fixedly connected to the fixing belt assembly to form a hollow cavity between them. An air bladder is placed inside the hollow cavity, and the air bladder is connected to the air pump through a flexible air supply pipe. The foot pedal control mechanism includes a positioning plate and a movable plate hinged to it. The swinging of the movable plate can control the start and stop of the air pump.

[0006] Preferably, the fastening strap assembly includes a body, with one or more first connecting straps extending to the right from the upper right side of the body, and one or more second connecting straps extending to the left from the lower left side of the body, the first and second connecting straps having fasteners that can be connected to the body.

[0007] Preferably, the lower end of the movable plate is hinged to a connecting rod, and the end of the connecting rod away from the movable plate is hinged to a moving block that is slidably connected to the positioning plate. The positioning plate is fixedly connected to a first limiting block and a second limiting block, and a sliding rod is fixedly connected between the first limiting block and the second limiting block. The sliding rod is slidably connected to the moving block.

[0008] Preferably, the first limiting block is fixedly connected to a positive contact, and the moving block is provided with a negative contact corresponding to the positive contact. The positive and negative contacts are electrically connected to the air supply pump through wires to form a switch control circuit when the movable plate swings.

[0009] Preferably, a first spring and a second spring are sleeved on the slide rod, with the first spring between the first limiting block and the moving block, and the second spring between the second limiting block and the moving block.

[0010] Preferably, the upper end face of the movable plate is provided with a limiting groove, a plurality of limiting bands are fixedly connected to the right side of the movable plate, and a plurality of through holes corresponding one-to-one with the limiting bands are provided on the left side of the movable plate.

[0011] Preferably, the airbag body is equipped with an exhaust valve, the exhaust valve having an opening pressure threshold of 4.5 MPa, which is used to automatically discharge gas when there is overpressure.

[0012] Preferably, the main body is made of an elastic material, and the elastic material has greater lateral elasticity and less longitudinal elasticity.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (i) The device incorporates a foot pedal control mechanism, enabling patients to independently control the start and stop of the air supply pump and the inflation pressure according to their own actual situation, thereby achieving personalized adjustment and active patient participation, and improving the enthusiasm and effectiveness of treatment.

[0015] (ii) The device also incorporates ankle joint exercise training. By combining mechanical transmission and pneumatic control, it achieves the synergistic effect of intermittent pneumatic therapy and ankle joint exercise, thereby improving the prevention of lower extremity venous thrombosis.

[0016] (iii) By configuring safety devices such as exhaust valves, the pressure inside the gas meter can be effectively prevented from becoming too high, thus ensuring the safety of patients. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a first schematic diagram of the fixing belt assembly in this utility model.

[0020] Figure 3 This is a second schematic diagram of the fixing belt assembly in this utility model.

[0021] Figure 4 This is a longitudinal sectional view of the fixing belt assembly in this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the fixing strap assembly acting on the patient's leg for air compression in this utility model.

[0023] Figure 6 This is a three-dimensional view of the overall structure of the foot pedal control mechanism in this utility model.

[0024] Figure 7 yes Figure 1 Enlarged schematic diagram of part A in the diagram.

[0025] In the diagram: 1-Foot pedal control mechanism, 2-Fixing belt assembly, 3-Air pump, 4-Covering elastic belt, 5-Hollow cavity, 6-Airbag body, 7-Air supply pipe, 8-Positioning plate, 9-Modible plate, 10-Main body, 11-First connecting belt, 12-Second connecting belt, 13-Fastener, 14-Connecting rod, 15-Moving block, 16-First limiting block, 17-Second limiting block, 18-Sliding rod, 19-Positive contact, 20-Negative contact, 21-Wire, 22-First spring, 23-Second spring, 24-Limiting groove, 25-Limiting belt, 26-Perforation, 27-Exhaust valve. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0027] Reference Figures 1-7 As shown, this utility model includes a foot pedal control mechanism 1, a fixing strap assembly 2, and an air pump 3. The inner side of the fixing strap assembly 2 is fixedly connected to a covering elastic strap 4. The periphery of the covering elastic strap 4 is fixedly connected to the fixing strap assembly 2 to form a hollow cavity 5 between the two. An airbag 6 is placed inside the hollow cavity 5. The airbag 6 is connected to the air pump 3 through a flexible air supply pipe 7.

[0028] The fixation strap assembly 2 is made of soft, breathable material and can be adjusted according to the patient's lower limb size to ensure the device is securely fixed to the lower limb. The air pump 3 uses an oil-free piston compressor with adjustable output pressure. The elastic covering band 4 has a certain degree of elasticity and can closely conform to the surface of the lower limb to prevent the airbag 6 from shifting during use; the airbag 6 is made of highly elastic, wear-resistant material and has good inflation and deflation performance. The shape and size of the airbag 6 can be designed according to different parts of the lower limb, such as the calf and thigh, to achieve compression on different parts of the lower limb. The elastic covering band 4 is circumferentially sealed to the fixation strap assembly 2 through a high-frequency heat sealing process to form a hollow cavity 5 with a thickness of 1.5-2.0mm. The cavity volume is designed according to the gradient of the human lower limb anatomical structure. The hollow cavity 5 has an embedded independent airbag 6. Multiple airbags 6 can be designed, and pressure waves are transmitted between adjacent airbags 6 through a flow channel. The air supply pipe 7 is made of a soft and pressure-resistant material, such as silicone tubing, to ensure that the gas does not leak during transportation.

[0029] The foot pedal control mechanism 1 includes a positioning plate 8 and a movable plate 9 hinged thereto. The swinging of the movable plate 9 controls the start and stop of the air supply pump 3. The positioning plate 8 is fixedly installed at the foot of the bed or other fixed object, providing support and positioning for the movable plate 9. The movable plate 9 is connected to the positioning plate 8 via a hinge, allowing the patient to swing it by stepping on it. The swing angle and force of the movable plate 9 can be adjusted according to the patient's actual situation to control the start and stop of the air supply pump 3 and the inflation pressure. This device controls the start and stop of the air supply pump through a foot pedal control mechanism, making operation simple and convenient. The patient can control the device's working status at any time according to their needs. By intermittently compressing the lower limbs, it promotes venous blood return in the lower limbs, effectively preventing the formation of deep vein thrombosis and reducing the occurrence of postoperative complications.

[0030] Specifically, the fixing strap assembly 2 includes a body 10, one or more first connecting straps 11 extending to the right from the upper right side of the body 10, and one or more second connecting straps 12 extending to the left from the lower left side of the body 10. The first connecting straps 11 and the second connecting straps 12 have fasteners 13 that can be connected to the body 10.

[0031] The fixing strap assembly is made of elastic material with greater lateral elasticity and less longitudinal elasticity, which can better fit the lower limb contour and improve the comfort and stability of the device.

[0032] This device consists of three parts: a foot pedal control mechanism 1, a fixing strap assembly 2, and an air supply pump 3. It achieves intermittent pneumatic therapy through a combination of mechanical transmission and pneumatic control. The main body 10 is integrally molded from medical-grade elastic material (such as thermoplastic polyurethane), with a transverse elastic modulus ≥2MPa and a longitudinal elastic modulus ≤0.5MPa, ensuring both tight wrapping of the lower limbs and preventing longitudinal slippage. The first connecting strap 11 and the second connecting strap 12 adopt a Velcro composite structure, in which the hook side is heat-pressed to the main body 10, and the rough side is ultrasonically cut to ensure edge smoothness, ensuring a suitable fit for patients with different leg circumferences.

[0033] To enable ankle movement, a connecting rod 14 is hinged to the lower end of the movable plate 9. A movable block 15, slidably connected to a positioning plate 8, is hinged to the end of the connecting rod 14 away from the movable plate 9. A first limiting block 16 and a second limiting block 17 are fixedly connected to the positioning plate 8. A sliding rod 18 is fixedly connected between the first limiting block 16 and the second limiting block 17, and the sliding rod 18 is slidably connected to the movable block 15. The movable plate 9, connecting rod 14, and movable block 15 constitute a crank-slider mechanism. The first limiting block 16 and the second limiting block 17 limit the swing angle of the movable plate 9. The surface of the sliding rod 18 is coated with a coefficient of friction <0.1, ensuring smooth reciprocating motion of the movable block 15.

[0034] To achieve intermittent pneumatic therapy for the other leg through ankle bone movement training in one leg, a positive contact 19 is fixedly connected to the first limiting block 16. A negative contact 20 corresponding to the positive contact 19 is provided on the moving block 15. The positive contact 19 and negative contact 20 are electrically connected to the air supply pump 3 via a wire 21, forming a switch control circuit for the swinging motion of the movable plate 9. The positive contact 19 uses gold-plated copper alloy contacts, and the negative contact 20 uses silver alloy elastic contacts. The wire 21 uses medical-grade silicone rubber insulated wire, with a bending resistance of >100,000 times. When the swing angle of the movable plate 9 is <15°, the moving block 15 triggers the contact to close, and the air supply pump 3 starts; when the swing angle is >30°, the spring force resets and disconnects the circuit, realizing the charging / discharging cycle control.

[0035] A first spring 22 and a second spring 23 are fitted onto the slide rod 18. The first spring 22 is located between the first limiting block 16 and the moving block 15, and the second spring 23 is located between the second limiting block 17 and the moving block 15. The first spring 22 (compression 30mm, stiffness coefficient 8N / mm) and the second spring 23 (compression 20mm, stiffness coefficient 12N / mm) constitute a nonlinear stiffness system, which effectively absorbs the impact force of the foot pedal, keeping the force range between 15-30N, and realizing the resistive movement of the ankle and the reset of the movable plate 9.

[0036] In order to fix the patient's foot, the upper end face of the movable plate 9 is provided with a limiting groove 24, multiple limiting bands 25 are fixedly connected to the right side of the movable plate 9, and multiple perforations 26 corresponding to the limiting bands 25 are provided on the left side of the movable plate 9.

[0037] To effectively prevent excessive pressure within the gas gauge and ensure patient safety, the gas bladder body 6 is equipped with an exhaust valve 27. The exhaust valve 27 has an opening pressure threshold of 4.5 MPa and is used to automatically release gas in case of overpressure. The exhaust valve 27 adopts a two-stage pressure response structure, with a main valve plate thickness of 0.15 mm and preload provided by a wave spring. When the gas gauge internal pressure reaches 4.5 MPa, the maximum deformation of the valve plate is 0.8 mm, and the exhaust channel area is ≥12 mm². 2 It can achieve rapid pressure relief.

[0038] Specifically: The patient assumes a sitting or lying position, with the fixation strap assembly 2 wrapping around one lower limb. The fastener 13 of the connecting strap is adjusted to a comfortable pressure (capillary refill time <2 seconds). The foot pedal control mechanism 1 is installed on the footrest bracket. The height of the positioning plate 8 is adjusted so that the patient's heel is 5-8 cm off the ground, and the other foot is fixed to the movable plate 9. Initially, the movable plate 9 is kept horizontal by spring force, and the air pump 3 is in standby mode. During treatment, the patient presses down on the movable plate 9 to a 15° angle, triggering the circuit to conduct. The air pump 3 inflates the air gauge 6, with the pressure gradient increasing sequentially from the distal end (ankle) to the proximal end (groin), lasting for 20 seconds. When the pressure is too high, the exhaust valve 27 opens to release air, preventing damage and discomfort caused by excessive pressure. When the foot is lifted, the movable plate 9 returns to its original position, the circuit is disconnected, and the air bladder 6 is quickly vented through the pressure relief valve, completing one treatment cycle; alternatively, the air pump has a suction function, and air is suctioned when the foot is raised to a certain angle; the cycle frequency is set to 6-8 times per minute.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A postoperative rehabilitation device for preventing lower extremity deep vein thrombosis, comprising a fixation strap assembly (2) and an air supply pump (3), characterized in that, The inner side of the fixing belt assembly (2) is fixedly connected to a covering elastic belt (4), and the periphery of the covering elastic belt (4) is fixedly connected to the fixing belt assembly (2) to form a hollow cavity (5) between the two. An airbag (6) is placed inside the hollow cavity (5), and the airbag (6) is connected to the air supply pump (3) through a flexible air supply pipe (7). It also includes a foot pedal control mechanism (1), which includes a positioning plate (8) and a movable plate (9) hinged thereto. The movable plate (9) can control the start and stop of the air supply pump (3) by swinging.

2. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to claim 1, characterized in that, The fixing strap assembly (2) includes a body (10), one or more first connecting straps (11) extending to the right from the upper right side of the body (10), and one or more second connecting straps (12) extending to the left from the lower left side of the body (10). The first connecting straps (11) and the second connecting straps (12) have fasteners (13) that can be connected to the body (10).

3. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to claim 1, characterized in that, The lower end of the movable plate (9) is hinged to a connecting rod (14), and the end of the connecting rod (14) away from the movable plate (9) is hinged to a moving block (15) that is slidably connected to the positioning plate (8). The positioning plate (8) is fixedly connected to a first limiting block (16) and a second limiting block (17). A sliding rod (18) is fixedly connected between the first limiting block (16) and the second limiting block (17), and the sliding rod (18) is slidably connected to the moving block (15).

4. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to claim 3, characterized in that, The first limiting block (16) is fixedly connected to a positive contact (19), and the moving block (15) is provided with a negative contact (20) corresponding to the positive contact (19). The positive contact (19) and the negative contact (20) are electrically connected to the air supply pump (3) through a wire (21) to form a switch control circuit when the movable plate (9) swings.

5. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to claim 3, characterized in that, The slide bar (18) is fitted with a first spring (22) and a second spring (23). The first spring (22) is between the first limiting block (16) and the moving block (15), and the second spring (23) is between the second limiting block (17) and the moving block (15).

6. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to any one of claims 1-5, characterized in that, The upper end face of the movable plate (9) is provided with a limiting groove (24), and multiple limiting bands (25) are fixedly connected to the right side of the movable plate (9). Multiple through holes (26) corresponding to the limiting bands (25) are provided on the left side of the movable plate (9).

7. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to any one of claims 1-5, characterized in that, The airbag body (6) is equipped with an exhaust valve (27), which has an opening pressure threshold of 4.5 MPa and is used to automatically discharge gas when there is overpressure.

8. The postoperative rehabilitation lower extremity deep vein thrombosis prevention device according to claim 2, characterized in that, The main body (10) is made of elastic material, and the transverse elastic modulus of the elastic material is greater than or equal to 2 MPa, and the longitudinal elastic modulus is less than or equal to 0.5 MPa.

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