An inflatable medical protective restraint belt

Abstract

This invention relates to the field of medical device technology and proposes an inflatable medical protective restraint belt, comprising a belt body, a distal airbag, a mid-section airbag, a proximal airbag, a gas distribution valve assembly, a micro air pump, and a micro geared motor. By sequentially arranging the distal, mid-section, and proximal airbags along the longitudinal direction of the limb within the belt body, and utilizing three circumferentially different air distribution channels with varying lengths and phases on a rotating gas distribution valve core, the three airbags inflate and deflate sequentially from distal to proximal as the valve core rotates continuously. This solves the technical problem of existing restraint belts causing obstruction of venous return and swelling due to blood pooling at the distal end of the limb caused by constant pressure. It achieves the technical effect of periodically applying pulsating pressure from distal to proximal to the limb during restraint, promoting venous blood return to the proximal end, and resolving the problems of reliance on nursing manpower and the potential for safety gaps in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an inflatable medical protective restraint belt. Background Technology

[0002] Currently, in clinical nursing, medical restraints are used to restrain the limbs of agitated patients to prevent self-harm or removal of tubes. Existing restraints apply continuous and constant binding pressure to the limbs during restraint. Some pneumatic restraints maintain constant internal pressure after inflation, and the pressure between the restraint and the limb contact surface remains constant throughout the restraint period.

[0003] In existing technologies, the restraints apply constant pressure to the limbs. Prolonged restraint leads to continuous obstruction of venous return in the distal extremities, causing blood pooling and swelling, and in severe cases, deep vein thrombosis. To alleviate these problems, nursing staff must manually loosen the restraints at fixed intervals according to established procedures.

[0004] However, the above-mentioned manual release method has the following drawbacks: on the one hand, the timed manual release operation depends on the frequency of execution by nursing staff, and the release is prone to delay when on night duty or when nursing staff is insufficient, which increases the risk of limb swelling and deep vein thrombosis; on the other hand, the patient's restraint is completely removed during the release period, which creates a safety window period for the patient to self-injury or extubation. Summary of the Invention

[0005] This invention provides an inflatable medical protective restraint belt, which solves the technical problems in related technologies, such as constant pressure restraint leading to obstruction of venous return in the distal limbs, blood pooling causing swelling and deep vein thrombosis, as well as the technical problems of manual loosening operations relying on nursing manpower and easily creating a safety window period.

[0006] This invention discloses an inflatable medical protective restraint belt, comprising a belt body, a distal airbag, a mid-section airbag, a proximal airbag, a gas distribution valve assembly, a micro air pump, and a micro geared motor. The gas distribution valve assembly includes a gas distribution valve housing and a rotary gas distribution valve core. The outer circumferential surface of the rotary gas distribution valve core has a distal gas distribution arc groove, a mid-section gas distribution arc groove, and a proximal gas distribution arc groove. The circumferential unfolding length and initial phase angle of the three gas distribution arc grooves are different, so that the rotary gas distribution valve core sequentially connects and disconnects the air source from the air supply to the three sets of airbags during rotation. The three sets of airbags inflate and deflate sequentially from distal to proximal, forming a centripetal pulsating compression wave on the limb surface. At least two sets of airbags are in an inflated restraint state at any rotation phase of the rotary gas distribution valve core.

[0007] Furthermore, the gas distribution valve housing has a cylindrical valve cavity, the axis of which extends longitudinally along the limb. The gas distribution valve housing is divided into three gas distribution sections along the valve cavity axis, corresponding to the distal airbag, the mid-section airbag, and the proximal airbag, respectively. In each gas distribution section, the gas distribution valve housing wall has a radial gas supply channel, a radial gas outlet channel, and a radial exhaust channel. All three are through holes that radially penetrate the wall of the gas distribution valve housing, and their inner end openings are located on the inner wall surface of the valve cavity and are distributed circumferentially. The outer end openings of the radial gas supply channels of the three gas distribution sections are all connected to the air inlet of the valve housing, and the outer end openings of the radial gas outlet channels of the three gas distribution sections are respectively connected to three independent air outlets of the valve housing. The outer end opening of the radial exhaust channel is connected to the atmosphere.

[0008] Furthermore, in each gas distribution section, the inner openings of the radial gas supply channel, the radial gas outlet channel, and the radial exhaust channel are arranged sequentially on the inner wall of the valve cavity along the rotation direction of the rotating gas distribution valve core. During the rotation of the rotating gas distribution valve core, each gas distribution arc groove sequentially undergoes the following states: the gas distribution arc groove simultaneously crosses the inner openings of the radial gas supply channel and the radial gas outlet channel of the corresponding section in the circumferential direction, introducing compressed gas into the radial gas outlet channel through the gas distribution arc groove to inflate the corresponding air bladder; after the gas distribution arc groove rotates away from the inner opening of the radial gas supply channel, it simultaneously crosses the inner openings of the radial gas outlet channel and the radial exhaust channel in the circumferential direction, discharging the gas in the corresponding air bladder to the atmosphere through the gas distribution arc groove and the radial exhaust channel to deflate the corresponding air bladder; subsequently, the solid circumferential surface of the rotating gas distribution valve core covers all three inner openings to form a sealed transition section.

[0009] Furthermore, an O-ring is embedded on each side of the axial direction of each air distribution arc groove on the outer circumferential surface of the rotary air distribution valve core. The O-ring is fitted in the annular sealing groove opened on the outer circumferential surface of the rotary air distribution valve core. The outer edge of the O-ring is elastically fitted to the inner wall of the valve cavity. An independent air distribution section sealing area is defined between two adjacent O-rings to prevent gas leakage between adjacent air distribution sections.

[0010] Furthermore, a gap seal is used between the outer peripheral surface of the rotary valve core and the inner wall of the valve cavity. No contact seal is provided between the outer peripheral surface of the rotary valve core and the inner wall of the valve cavity. The airtight isolation between each valve distribution section and each channel is achieved by relying on the airflow resistance of the small radial gap between the outer peripheral surface of the rotary valve core and the inner wall of the valve cavity.

[0011] Furthermore, one end of the gas distribution valve housing is an open end for the rotary valve core to be installed, and the other end is a closed end. A threaded valve cover is fitted to the open end of the gas distribution valve housing through a threaded connection. A thrust washer is provided between the inner side of the threaded valve cover and the corresponding end face of the rotary valve core. One side of the thrust washer abuts against the inner side of the threaded valve cover, and the other side abuts against the end face of the rotary valve core. A compression spring is provided between the other end face of the rotary valve core and the inner end face of the closed end of the valve cavity. The compression spring elastically presses against the end face of the rotary valve core along the axial direction and pushes the rotary valve core towards the threaded valve cover, so that the end face of the rotary valve core and the thrust washer are in contact, thereby achieving axial positioning of the rotary valve core in the valve cavity.

[0012] Furthermore, the micro geared motor is fixedly installed on the outside of the closed end of the gas distribution valve housing. The motor output shaft of the micro geared motor passes through the shaft hole on the closed end wall of the gas distribution valve housing and extends into the valve cavity. A shaft seal is provided at the shaft hole. The motor output shaft is coaxially connected with the rotary gas distribution valve core and drives the rotary gas distribution valve core to rotate.

[0013] Furthermore, the belt is a flexible, elongated component, and the interior of the belt forms three accommodating cavities arranged sequentially along the longitudinal direction of the limb. The three accommodating cavities are respectively used to accommodate the distal airbag, the mid-section airbag, and the proximal airbag. The three accommodating cavities are separated by the inner layer partition of the belt. The two ends of the belt are provided with hooks and loops for fixing the free ends of the belt after it wraps around the limb.

[0014] Furthermore, the three valve housing outlets are respectively sealed to the air inlets of the distal airbag, the mid-section airbag, and the proximal airbag via the distal air guide hose, the mid-section air guide hose, and the proximal air guide hose; the distal air guide hose, the mid-section air guide hose, and the proximal air guide hose are flexible pipelines laid inside the belt or fixed along the surface of the belt.

[0015] Furthermore, the distal air-conducting hose, the mid-section air-conducting hose, and the proximal air-conducting hose are connected to the air inlet of each airbag by a barbed nozzle insertion and sealing connection. The air inlet of each airbag is a tubular protrusion on the airbag wall. The barbed nozzle is inserted into the tubular protrusion. The outer wall of the barbed nozzle is provided with a barbed flange that is in a contracted posture along the insertion direction and an open posture along the withdrawal direction. The barbed flange engages with the inner wall of the tubular protrusion to form an interference seal.

[0016] This invention solves the technical problem of obstructed venous return and blood pooling leading to swelling in the distal end of the limb due to constant pressure in existing restraint straps. It achieves the technical effect of periodically applying pulsating pressure from the distal end to the proximal end to the limb during restraint, thus promoting venous blood return to the proximal end. This is achieved by sequentially setting distal airbags, mid-section airbags, and proximal airbags along the longitudinal direction of the limb within the restraint strap, and utilizing three circumferentially expanded and phased air channels on the rotating air distribution valve core.

[0017] This invention, by configuring the circumferential unfolding length and phase of three gas distribution channels, ensures that at least two sets of airbags are in an inflated restraint state at any rotation phase of the rotating gas distribution valve core. This solves the technical problem in the prior art where manual release operation results in a safety window period due to complete release of restraint. It achieves the technical effect of maintaining the restraint of the limbs throughout the entire use process, reducing the risk of patient self-injury or extubation.

[0018] The timing of the pulsating compression in this invention is determined by the mechanical rotation of the rotary valve core and the inherent geometric parameters of the air distribution channel. The rotary valve core can automatically complete the alternating inflation and deflation cycle of the three sets of airbags by continuously rotating under the drive of the micro geared motor. This solves the technical problem in the prior art that relies on nurses to manually release the airbags at regular intervals, which leads to high nursing manpower requirements and the risk of delayed release. It achieves the technical effect of automatic operation of the pulsating compression process without relying on nurses' regular intervention. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a front view of the inflatable medical protective restraint belt of the present invention; Figure 2 This is a longitudinal sectional view of the inflatable medical protective restraint belt of the present invention; Figure 3 This is a cross-sectional view of the inflatable medical protective restraint strap of the present invention wrapped around a limb; Figure 4 This is a longitudinal sectional view of the gas distribution valve assembly of the inflatable medical protective restraint belt of the present invention. Figure 5 This is a cross-sectional view of a single gas distribution section of the gas distribution valve of the inflatable medical protective restraint belt of the present invention. Figure 6 This is an isometric drawing of the rotary valve mandrel of the inflatable medical protective restraint belt of the present invention; Figure 7 This is an isometric view of the limb wrapped in the inflatable medical protective restraint strap of the present invention.

[0021] In the diagram: Belt-1, Distal Airbag-2, Mid-section Airbag-3, Proximal Airbag-4, Gas Distribution Valve Housing-5, Rotary Gas Distribution Valve Core-6, Distal Gas Distribution Arc Groove-7, Mid-section Gas Distribution Arc Groove-8, Proximal Gas Distribution Arc Groove-9, Miniature Air Pump-10, Miniature Gear Motor-11, Distal Air Guide Hose-12, Mid-section Air Guide Hose-13, Proximal Air Guide Hose-14, Hook and Loop Buckle-15, Valve Housing Inlet-16, Valve Housing Outlet-17, Radial Air Supply Channel-18, Radial Air Outlet Channel-19, Radial Exhaust Channel-20, Threaded Valve Cover-21, Thrust Washer-22, Compression Spring-23, O-ring Seal-24, Motor Output Shaft-25, Shaft Seal-26, Limb-27. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Example like Figures 1-7As shown, according to an embodiment of this invention, an inflatable medical protective restraint belt is provided, which is used to apply pulsating pressure from distal to proximal to the limb 27 while restraining the limb 27. The inflatable medical protective restraint belt includes at least a belt body 1, three sets of airbags disposed within the belt body 1, a gas distribution valve assembly disposed on one side of the belt body 1, a miniature air pump 10 connected to the air inlet end of the gas distribution valve assembly, and a miniature geared motor 11 that drives the rotary gas distribution valve core 6 in the gas distribution valve assembly to rotate continuously. The belt body 1 wraps around the periphery of the limb 27 and forms the overall reference. The three sets of airbags are arranged sequentially along the longitudinal direction of the limb 27 and are respectively named distal airbag 2, mid-section airbag 3, and proximal airbag 4. The gas distribution valve assembly includes a gas distribution valve housing 5 and a rotary gas distribution valve core 6 rotatably housed within the gas distribution valve housing 5. The rotary gas distribution valve core 6 has circumferentially oriented distal gas distribution channels, mid-section gas distribution channels, and proximal gas distribution channels corresponding to the three sets of airbags, respectively. The circumferential expansion length and phase of the three gas distribution channels are different. A miniature air pump 10 continuously outputs compressed gas to the air inlet of the gas distribution valve housing 5. Driven by a miniature geared motor 11, the rotary gas distribution valve core 6 rotates continuously at low speed around its axis. During rotation, it sequentially connects or disconnects the air source from the gas supply to the air passages of different airbags, causing the three sets of airbags to inflate and deflate sequentially from distal to proximal, forming a centripetal pulsating compression wave on the surface of the limb 27. At any rotation phase, at least two sets of airbags are in an inflated restraint state, and the entire strap 1 maintains a constant wrapping restraint on the limb 27.

[0024] The following sections will provide a detailed explanation of each part of the structure.

[0025] The strap 1 is a flexible, elongated component. Its width extends perpendicular to the longitudinal direction of the limb 27, and its length is sufficient to completely wrap around the outer periphery of the limb 27. The interior of the strap 1 forms three accommodating cavities arranged sequentially along the longitudinal direction of the limb 27. These cavities are used to accommodate the distal airbag 2, the mid-section airbag 3, and the proximal airbag 4, respectively. The three accommodating cavities are spaced apart along the longitudinal direction of the limb 27 and separated from each other by an inner partition of the strap 1. One end of the strap 1 has a fastening buckle to secure the free end of the strap 1 after it wraps around the limb 27, maintaining the wrapping state of the strap 1 around the limb 27.

[0026] In some embodiments, the fastener is a hook and loop fastener 15, one end of the strap body 1 is sewn with a hook-faced webbing, and the outer surface of the other end of the strap body 1 is provided with an annular webbing. After the strap body 1 wraps around the limb 27, the hook-faced webbing and the annular webbing are bonded together to achieve fixation.

[0027] The distal airbag 2, mid-section airbag 3, and proximal airbag 4 are respectively embedded in the three receiving cavities of the belt body 1. All three sets of airbags are sealed flexible bladders, with their inner surfaces facing the surface of the limb 27 and their outer surfaces facing the outer layer of the belt body 1. When inflated, the inner surfaces of each airbag expand radially towards the center of the limb 27 and press against the surface of the limb 27, applying pressure. When deflated, each airbag elastically retracts, releasing pressure on the limb 27. Each set of airbags has an air inlet, which extends through the belt body 1 and connects to the corresponding air guide tube.

[0028] In some embodiments, each airbag is sealed and fixed in the corresponding receiving cavity of the belt 1 by a heat sealing process, and a heat-sealed boundary is formed between the periphery of the airbag and the inner wall of the receiving cavity to prevent the airbag from shifting during repeated inflation and deflation.

[0029] The gas distribution valve assembly is fixed to one side of the belt body 1 along the longitudinal direction of the limb 27, and includes a gas distribution valve housing 5 and a rotary gas distribution valve core 6.

[0030] The gas distribution valve housing 5 is a housing component with an internal cylindrical valve cavity, the axis of which extends longitudinally along the limb 27. One end of the gas distribution valve housing 5 has an open end for inserting the rotary gas distribution valve core 6, and the other end is closed. The gas distribution valve housing 5 is divided into three gas distribution sections along the axial direction of the valve cavity, corresponding to the distal airbag 2, the mid-section airbag 3, and the proximal airbag 4, respectively. In each gas distribution section, a gas supply channel and a gas outlet channel are formed on the wall of the gas distribution valve housing 5. The gas supply channels of the three gas distribution sections are all connected to the same valve housing inlet 16 on the outer wall of the gas distribution valve housing 5, and the valve housing inlet 16 is connected to the outlet end of the micro air pump 10 through a pipeline. The gas outlet channels of the three gas distribution sections are respectively connected to three independent valve housing outlets 17 on the outer wall of the gas distribution valve housing 5. The three valve housing outlets 17 are respectively connected to the distal airbag 2, the middle airbag 3 and the proximal airbag 4 through the distal air guide hose 12, the middle air guide hose 13 and the proximal air guide hose 14.

[0031] It should be noted that in each gas distribution section, both the gas supply channel and the gas outlet channel are through holes that radially penetrate the wall of the gas distribution valve housing 5. Their inner openings are located on the inner wall of the valve cavity, and their outer openings are located on the outer wall of the gas distribution valve housing 5. The inner openings of the gas supply channel and the gas outlet channel are circumferentially spaced on the inner wall of the valve cavity in the same gas distribution section. Furthermore, in each gas distribution section, an exhaust channel is also provided on the wall of the gas distribution valve housing 5. The exhaust channel is a through hole that radially penetrates the wall of the gas distribution valve housing 5. Its outer opening communicates with the atmosphere, and its inner opening is located on the inner wall of the valve cavity, circumferentially spaced from the inner openings of the gas supply channel and the gas outlet channel in the same section. The function of the exhaust channel is explained in the gas distribution principle section of the rotary gas distribution valve core 6.

[0032] The rotary valve core 6 is a cylindrical valve core component that fits with the valve cavity with a clearance. It is rotatably housed within the valve cavity of the gas distribution valve housing 5, and the axis of the rotary valve core 6 coincides with the axis of the valve cavity. A sealing sliding fit is formed between the outer circumferential surface of the rotary valve core 6 and the inner wall surface of the valve cavity, ensuring airtightness between the gas distribution sections and between the channels when not in operation. The rotary valve core 6 also corresponds to three gas distribution sections along the axial direction. On the outer circumferential surface of the rotary valve core 6 corresponding to each gas distribution section, a circumferentially extending gas distribution channel is formed. The gas distribution channel is an arc-shaped groove formed on the outer circumferential surface of the rotary valve core 6, and its circumferential extension length occupies a portion of the arc segment of the circumferential surface of the rotary valve core 6.

[0033] The distal, mid-section, and proximal air distribution channels are located on the three air distribution sections of the rotary air distribution valve core 6. The circumferential length and initial phase angle of the three air distribution channels are different. Specifically, the circumferential arc segments of the three air distribution channels on the outer circumferential surface of the rotary air distribution valve core 6 are staggered, ensuring that at any rotation phase of the rotary air distribution valve core 6, at least two of the three air distribution channels are simultaneously within the angle range that bridges and connects the inner opening of the supply channel and the inner opening of the outlet channel of their respective sections.

[0034] The air distribution principle of the rotary valve core 6 is as follows: When the rotary valve core 6 rotates to a certain phase, if the air distribution channel of a certain air distribution section happens to cross the inner end opening of the air supply channel and the inner end opening of the air outlet channel in the circumferential direction, then compressed gas flows from the air supply channel into the air outlet channel through the air distribution channel, and then enters the corresponding air bladder through the air guide pipe, where the air bladder inflates. As the rotary valve core 6 continues to rotate, the air distribution channel gradually moves away from the position of the inner end opening of the air supply channel. The air distribution channel no longer simultaneously bridges the air supply channel and the air outlet channel, the air source is disconnected from the inflation air path of the air bladder, and the air bladder stops receiving air. As the rotary valve core 6 rotates further, the inner opening of the exhaust passage in this valve section is exposed to the arc segment traversed by the valve channel or is no longer obscured by the solid circumference of the rotary valve core 6. The inner opening of the exhaust passage is bridged and connected to the inner opening of the exhaust passage through the valve channel. The gas in the airbag is discharged to the atmosphere through the exhaust passage, the valve channel, and the exhaust passage, and the airbag deflates and contracts. Because the phases of the three valve channels are staggered in sequence, the inflation and expansion processes of the distal airbag 2, the mid-section airbag 3, and the proximal airbag 4 occur sequentially from distal to proximal, and the deflation and contraction processes also follow in the same sequence, thereby forming a pulsating pressure wave traveling from distal to proximal on the surface of the limb 27.

[0035] It should be understood that in each gas distribution section, the circumferential arrangement of the inner end openings of the gas supply channel, the gas outlet channel, and the exhaust channel on the inner wall of the valve cavity should be coordinated with the rotation direction of the rotating gas distribution valve core 6, so that the gas distribution channel goes through the following states in sequence during rotation: first, it bridges the gas supply channel and the gas outlet channel to achieve gas filling, then it separates from the gas supply channel, then it bridges the gas outlet channel and the exhaust channel to achieve gas release, and finally the solid circumferential surface of the rotating gas distribution valve core 6 covers all three openings to form a sealed transition section.

[0036] In some embodiments, an O-ring 24 is embedded on each side of the axial direction of each air distribution channel on the outer peripheral surface of the rotary valve core 6. The O-ring 24 is fitted into the annular sealing groove opened on the outer peripheral surface of the rotary valve core 6, and the outer edge of the O-ring 24 elastically fits against the inner wall of the valve cavity. An independent sealing area for the air distribution section is defined between two adjacent O-rings 24 to prevent gas leakage between adjacent air distribution sections.

[0037] In some embodiments, the outer peripheral surface of the rotary valve core 6 and the inner wall of the valve cavity are fitted with a gap seal. The outer peripheral surface of the rotary valve core 6 is precision machined so that the radial gap between it and the inner wall of the valve cavity is controlled within the range that meets the airtightness requirements. No contact seal is provided between the outer peripheral surface of the rotary valve core 6 and the inner wall of the valve cavity. Airtight isolation between each valve distribution section and each channel is achieved by relying on the airflow resistance of the small gap.

[0038] Furthermore, to prevent the rotary valve core 6 from axially shifting within the valve cavity, causing axial misalignment between the gas distribution channel and the corresponding section's opening and affecting gas distribution accuracy, a threaded valve cover 21 is fitted to the open end of the gas distribution valve housing 5. The threaded valve cover 21 is fixed to the open end of the gas distribution valve housing 5 via a threaded connection. A thrust washer 22 is provided between the inner surface of the threaded valve cover 21 and the corresponding end face of the rotary valve core 6. One side of the thrust washer 22 abuts against the inner surface of the threaded valve cover 21, and the other side abuts against the end face of the rotary valve core 6, restricting the rotary valve core 6 from moving axially toward the open end. An elastic thrust member is provided between the other end face of the rotary valve core 6 and the inner end face of the valve cavity closed end. The elastic thrust member elastically presses against the end face of the rotary valve core 6 along the axial direction, pushing the rotary valve core 6 towards the threaded valve cover 21, so that the end face of the rotary valve core 6 and the thrust washer 22 are in contact, thereby realizing the axial positioning of the rotary valve core 6 in the valve cavity.

[0039] A miniature geared motor 11 is fixedly installed on the outside of the closed end of the gas distribution valve housing 5. The motor output shaft 25 of the miniature geared motor 11 extends into the valve cavity through a shaft hole on the closed end wall of the gas distribution valve housing 5. A shaft seal 26 is provided at the shaft hole to prevent gas from leaking out along the gap between the motor output shaft 25 and the shaft hole. The motor output shaft 25 of the miniature geared motor 11 is coaxially connected to the rotary valve core 6, driving the rotary valve core 6 to rotate continuously at low speed around the valve cavity axis.

[0040] In some embodiments, the motor output shaft 25 of the micro geared motor 11 is connected to the rotary valve core 6 via a flat key. A keyway is machined at the end of the motor output shaft 25, and a shaft hole is formed at the center of the corresponding end face of the rotary valve core 6 to mate with the motor output shaft 25. The inner wall of the shaft hole has a keyway corresponding to the keyway of the motor output shaft 25. The flat key is embedded in the keyways on both sides to achieve circumferential locking and torque transmission, while also allowing the rotary valve core 6 to slide slightly axially relative to the motor output shaft 25 to accommodate the adjustment of the axial positioning structure.

[0041] In some embodiments, the motor output shaft 25 of the micro geared motor 11 is integrally formed with the rotary valve core 6, and the end of the motor output shaft 25 is the spindle of the rotary valve core 6. There is no independent connecting part between the rotary valve core 6 and the motor output shaft 25.

[0042] The miniature air pump 10 is fixed to one side of the strap body 1 or to the environment in which the inflatable medical protective restraint strap is used via an external fixing bracket. The air inlet of the miniature air pump 10 is open to the atmosphere, and the air outlet is connected to the air inlet 16 of the gas distribution valve housing 5 via a flexible pipe. The miniature air pump 10 is driven by a timing control circuit, which controls the miniature air pump 10 to start and stop or run continuously according to a set working sequence, continuously outputting compressed gas to the gas distribution valve assembly.

[0043] The distal air guide hose 12, the mid-section air guide hose 13, and the proximal air guide hose 14 are all flexible conduits, laid inside the belt body 1 or fixed along the surface of the belt body 1. One end of the distal air guide hose 12 is sealed to the distal valve housing outlet 17 of the gas distribution valve housing 5, and the other end is sealed to the inlet of the distal airbag 2. One end of the mid-section air guide hose 13 is sealed to the mid-section valve housing outlet 17 of the gas distribution valve housing 5, and the other end is sealed to the inlet of the mid-section airbag 3. One end of the proximal air guide hose 14 is sealed to the proximal valve housing outlet 17 of the gas distribution valve housing 5, and the other end is sealed to the inlet of the proximal airbag 4.

[0044] In some embodiments, each air duct and the air inlet of each airbag are connected by a barbed nozzle insertion seal. The air inlet of each airbag is a tubular protrusion on the airbag wall. The end of the air duct is fitted with a barbed nozzle, which is inserted into the tubular protrusion of the airbag. The outer wall of the barbed nozzle has a barbed flange that is constricted in the insertion direction and open in the withdrawal direction. After insertion, the barbed flange engages with the inner wall of the tubular protrusion, preventing the air duct from dislodging from the air inlet of the airbag. Simultaneously, the interference fit between the barbed flange and the inner wall of the tubular protrusion forms a seal.

[0045] Execution steps When using an inflatable medical protective restraint belt, first align the belt body 1 longitudinally along the limb 27 and wrap it around the limb 27 that needs to be restrained, so that the distal airbag 2 corresponds to the distal segment of the limb 27, the mid-section airbag 3 corresponds to the mid-section of the limb 27, and the proximal airbag 4 corresponds to the proximal segment of the limb 27. Then, fix the free end of the belt body 1 with the fastening buckle so that the belt body 1 fits against the outer surface of the limb 27 and maintains the wrapped state.

[0046] Subsequently, the timing control circuit is activated, driving the micro air pump 10 to continuously output compressed gas. The compressed gas enters the valve housing inlet 16 of the gas distribution valve housing 5 through a flexible pipeline, and reaches the inner end opening of each gas supply channel on the inner wall of the valve cavity through the gas supply channels of each gas distribution section. At the same time, the micro geared motor 11 starts and drives the rotary gas distribution valve core 6 to begin continuous low-speed rotation around the axis in the valve cavity.

[0047] During the continuous rotation of the rotary valve core 6, each air distribution section completes the inflation and deflation cycle sequentially according to the following timing sequence: When the rotary valve core 6 rotates to the phase range where the inner opening of the supply channel and the inner opening of the outlet channel of the distal supply section are bridged by the distal supply arc groove 7, compressed gas flows from the supply channel through the distal supply arc groove 7 into the outlet channel, and then through the distal air guide hose 12 into the distal airbag 2. The distal airbag 2 inflates and applies pressure to the distal section of the limb 27. At this time, at least one of the mid-section supply arc groove 8 and the proximal supply arc groove 9 is still within the phase range bridging the supply and outlet channels of their respective sections, and the corresponding airbags maintain a synchronous inflation restraint state.

[0048] As the rotary valve core 6 continues to rotate, the distal air distribution arc groove 7 gradually moves away from the inner opening of the air supply channel in the distal section, disconnecting the inflation path of the distal airbag 2. After the rotary valve core 6 rotates further, the distal air distribution arc groove 7 bridges the inner opening of the outlet channel and the inner opening of the exhaust channel in the distal section. The gas in the distal airbag 2 is discharged to the atmosphere through the exhaust channel, causing the distal airbag 2 to deflate and contract, reducing the pressure on the distal section of the limb 27.

[0049] During the same time period when the distal airbag 2 enters the deflation phase, the mid-section air distribution arc groove 8 rotates to the phase of bridging the inner end opening of the mid-section air supply channel and the inner end opening of the air outlet channel, and the mid-section airbag 3 begins to inflate and apply pressure to the mid-section of the limb 27.

[0050] Subsequently, the mid-section air distribution arc groove 8 rotates away from the air supply channel in the same manner and enters the exhaust stage, while the mid-section airbag 3 deflates and contracts. At the same time, the proximal air distribution arc groove 9 rotates to the phase of the air supply channel and exhaust channel in the bridge approach section, and the proximal airbag 4 inflates and applies pressure to the proximal section of the limb 27.

[0051] As the rotary valve core 6 completes one rotation, the three sets of airbags sequentially complete one inflation-deflation cycle from distal to proximal, forming a complete centripetal pulsating pressure wave on the surface of the limb 27. The rotary valve core 6 continues to rotate, and the pulsating pressure wave is continuously generated repeatedly.

[0052] Throughout the pulsation process, due to the configuration of the circumferential expansion length and phase of the three air distribution channels, at least two sets of airbags are always in an inflated and constrained state at any rotation phase of the rotating air distribution valve core 6. Therefore, even if the airbags in a certain section are deflating, the adjacent airbags on both sides of that section still maintain inflation and exert constraint on the limb 27, and the entire belt 1 never reaches a state of complete constraint release.

[0053] When it is necessary to terminate the restraint, the timing control circuit is turned off, the micro air pump 10 and the micro geared motor 11 stop working, and the rotary air distribution valve core 6 stops rotating. The residual gas in the three sets of airbags is gradually discharged to the atmosphere through the exhaust channel connected to the corresponding air distribution channel in its respective section, and the airbags naturally deflate and contract. Then, the fixing buckle of the belt 1 is loosened, and the belt 1 is removed from the limb 27.

[0054] Technical effects of this embodiment The inflatable medical protective restraint belt provided in this embodiment has a distal airbag 2, a mid-section airbag 3, and a proximal airbag 4 arranged sequentially along the longitudinal direction of the limb 27 within the belt body 1. Through three circumferentially oriented air distribution channels with different unfolding lengths and phases on the rotating air distribution valve core 6 in the gas distribution valve assembly, the air source is sequentially connected and disconnected to the three sets of airbags during the continuous rotation of the rotating air distribution valve core 6. This causes the three sets of airbags to inflate and deflate sequentially from distal to proximal, forming a centripetal pulsating compression wave on the surface of the limb 27. This pulsating compression wave applies pressure to the limb 27 sequentially from distal to proximal, simulating the pushing effect on the return of venous blood from the distal end of the limb 27 to the proximal end. Therefore, during restraint, venous blood from the distal end of the limb 27 can be periodically pushed towards the proximal end for return, avoiding the swelling problem caused by continuous blood pooling at the distal end due to obstructed venous return under constant pressure.

[0055] Furthermore, because the circumferential expansion length and phase of the three gas distribution channels are configured such that at least two sets of airbags are in an inflated restraint state at any rotation phase of the rotary gas distribution valve core 6, while the airbags in a certain section deflate to reduce the pressure, the airbags in adjacent sections remain inflated and exert restraint on the limb 27, ensuring that the limb 27 is never completely released from restraint throughout the entire pulsation cycle. Therefore, this embodiment eliminates the safety window period for complete restraint release caused by manual release operations in the prior art, reducing the risk of patient self-injury or extubation during restraint.

[0056] Meanwhile, since the temporal variation of pulsating compression is entirely determined by the mechanical rotation of the rotary valve core 6 and the inherent geometric parameters of the air distribution channel, the rotary valve core 6, driven by the micro geared motor 11, can automatically complete the alternating inflation and deflation cycle of the three sets of airbags by continuous rotation. This eliminates the need for nursing staff to manually perform release and re-restraint operations according to procedures. Therefore, the pulsating compression process is independent of the frequency and presence of nursing staff, overcoming the problem of increased limb swelling and deep vein thrombosis risks due to delayed release during night shifts or when nursing staff are insufficient.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inflatable medical protective restraint belt, characterized in that, include: The band (1) is used to wrap around the periphery of the limb (27); The distal airbag (2), mid-section airbag (3) and proximal airbag (4) are sequentially arranged along the longitudinal direction of the limb within the belt (1). The gas distribution valve assembly, fixed to one side of the belt (1), includes a gas distribution valve housing (5) and a rotary gas distribution valve core (6) rotatably housed within the gas distribution valve housing (5). A miniature air pump (10) is connected to the valve housing inlet (16) of the gas distribution valve housing (5) for continuous output of compressed gas; A miniature geared motor (11) is connected to the rotary valve core (6) and drives the rotary valve core (6) to rotate continuously around its axis; Among them, the outer circumferential surface of the rotary valve core (6) is provided with a distal air distribution arc groove (7), a middle air distribution arc groove (8) and a proximal air distribution arc groove (9) corresponding to the three sets of airbags respectively. The circumferential expansion length and initial phase angle of the three air distribution arc grooves are different, so that the rotary valve core (6) connects and disconnects the air source with the air passage of the three sets of airbags in sequence during the rotation process. The three sets of airbags are inflated and expanded in sequence from the distal end to the proximal end and then deflated and contracted in sequence, forming a centripetal pulsating pressure wave on the surface of the limb (27). At least two sets of airbags are in an inflated constraint state under any rotation phase of the rotary valve core (6).

2. The inflatable medical protective restraint belt according to claim 1, characterized in that, The gas distribution valve housing (5) has a cylindrical valve cavity inside. The axis of the valve cavity extends longitudinally along the limb. The gas distribution valve housing (5) is divided into three gas distribution sections along the valve cavity axis, corresponding to the distal airbag (2), the middle airbag (3), and the proximal airbag (4), respectively. In each gas distribution section, the gas distribution valve housing (5) has a radial gas supply channel (18), a radial gas outlet channel (19), and a radial exhaust channel (20) on its wall. All three are through holes that radially penetrate the wall of the gas distribution valve housing (5). Their inner end openings are located on the inner wall surface of the valve cavity and are distributed circumferentially. The outer end openings of the radial gas supply channels (18) of the three gas distribution sections are all connected to the valve housing inlet (16). The outer end openings of the radial gas outlet channels (19) of the three gas distribution sections are respectively connected to the three independent valve housing outlets (17). The outer end opening of the radial exhaust channel (20) is connected to the atmosphere.

3. The inflatable medical protective restraint belt according to claim 2, characterized in that, In each gas distribution section, the inner openings of the radial gas supply channel (18), the radial gas outlet channel (19), and the radial exhaust channel (20) are arranged sequentially on the inner wall of the valve cavity along the rotation direction of the rotary gas distribution valve core (6). During the rotation of the rotary gas distribution valve core (6), each gas distribution arc groove sequentially undergoes the following states: the gas distribution arc groove simultaneously crosses the inner openings of the radial gas supply channel (18) and the radial gas outlet channel (19) of the corresponding section in the circumferential direction, thereby pressurizing the gas distribution valve core (6). The compressed gas is introduced into the radial outlet channel (19) through the gas distribution arc groove to inflate the corresponding airbag; after the gas distribution arc groove turns away from the inner end opening of the radial supply channel (18), it simultaneously crosses the inner end opening of the radial outlet channel (19) and the inner end opening of the radial exhaust channel (20) in the circumferential direction, and discharges the gas in the corresponding airbag to the atmosphere through the gas distribution arc groove and the radial exhaust channel (20) to deflate the corresponding airbag; then the solid circumferential surface of the gas distribution valve core (6) is rotated to cover all three inner end openings to form a sealed transition section.

4. The inflatable medical protective restraint belt according to claim 2, characterized in that, On the outer circumferential surface of the rotary valve core (6), an O-ring (24) is embedded on each side of the axial direction of each gas distribution arc groove. The O-ring (24) is fitted in the annular sealing groove opened on the outer circumferential surface of the rotary valve core (6). The outer edge of the O-ring (24) is elastically fitted to the inner wall of the valve cavity. The two adjacent O-rings (24) define an independent gas distribution section sealing area to prevent gas leakage between adjacent gas distribution sections.

5. The inflatable medical protective restraint belt according to claim 2, characterized in that, The outer circumferential surface of the rotary valve core (6) and the inner wall of the valve cavity are sealed with a gap. No contact seal is provided between the outer circumferential surface of the rotary valve core (6) and the inner wall of the valve cavity. The airtight isolation between each gas distribution section and each channel is achieved by relying on the airflow resistance of the small radial gap between the outer circumferential surface of the rotary valve core (6) and the inner wall of the valve cavity.

6. The inflatable medical protective restraint belt according to claim 2, characterized in that, One end of the gas distribution valve housing (5) is an open end for the rotary valve core (6) to be installed, and the other end is a closed end; a threaded valve cover (21) is fitted to the open end, and the threaded valve cover (21) is fixed to the open end of the gas distribution valve housing (5) by a threaded connection. A thrust washer (22) is provided between the inner side of the threaded valve cover (21) and the corresponding end face of the rotary valve core (6). One side of the thrust washer (22) abuts against the inner side of the threaded valve cover (21), and the other side... One end face of the rotary valve core (6) is against the end face of the rotary valve core (6); a compression spring (23) is provided between the other end face of the rotary valve core (6) and the inner end face of the valve cavity. The compression spring (23) elastically presses against the end face of the rotary valve core (6) along the axial direction and pushes the rotary valve core (6) towards the threaded valve cover (21), so that the end face of the rotary valve core (6) and the thrust washer (22) are in contact, thereby realizing the axial positioning of the rotary valve core (6) in the valve cavity.

7. The inflatable medical protective restraint belt according to claim 6, characterized in that, The micro geared motor (11) is fixedly installed on the outside of the closed end of the gas distribution valve housing (5). The motor output shaft (25) of the micro geared motor (11) passes through the shaft hole on the closed end wall of the gas distribution valve housing (5) and extends into the valve cavity. A shaft seal (26) is provided at the shaft hole. The motor output shaft (25) is coaxially connected with the rotary gas distribution valve core (6) and drives the rotary gas distribution valve core (6) to rotate.

8. The inflatable medical protective restraint belt according to claim 1, characterized in that, The belt (1) is a flexible, long strip-shaped component. The inside of the belt (1) forms three accommodating cavities arranged in sequence along the longitudinal direction of the limb. The three accommodating cavities are used to accommodate the distal airbag (2), the mid-section airbag (3), and the proximal airbag (4), respectively. The three accommodating cavities are separated by the inner layer partition of the belt (1). The two ends of the belt (1) are provided with hook and loop buckles (15) for fixing the free end of the belt (1) after the belt (1) wraps around the limb (27).

9. The inflatable medical protective restraint belt according to claim 1, characterized in that, The three valve housing outlets (17) are respectively sealed to the air inlets of the distal airbag (2), the middle airbag (3) and the proximal airbag (4) through the distal air guide hose (12), the middle air guide hose (13) and the proximal air guide hose (14); the distal air guide hose (12), the middle air guide hose (13) and the proximal air guide hose (14) are flexible pipelines laid inside the belt body (1) or fixed along the surface of the belt body (1).

10. The inflatable medical protective restraint belt according to claim 9, characterized in that, The distal air-conducting hose (12), the middle air-conducting hose (13) and the proximal air-conducting hose (14) are connected to the air inlet of each airbag by a barbed nozzle insertion and sealing connection. The air inlet of each airbag is a tubular protrusion on the airbag wall. The barbed nozzle is inserted into the tubular protrusion. The outer wall of the barbed nozzle is provided with a barbed flange that is in a contracted posture along the insertion direction and an open posture along the withdrawal direction. The barbed flange is engaged with the inner wall of the tubular protrusion to form an interference seal.

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