Four-limb restraining device

Abstract

The invention discloses a four-limb restraint device, which comprises a connecting piece with one end connected with a restraint mechanism and the other end used for external fixation; the restraining mechanism comprises a restraining body, a restraining ring, a gear, a friction plate, a locking assembly and a driver, a cavity is formed in the restraining body, one end of the restraining ring is rotationally connected with the restraining body, and a rack section meshed with the gear is arranged at the other end of the restraining ring; the locking assembly, the friction plate and the driver are arranged in the cavity, the gear is arranged at the moving end of the locking assembly, the friction plate is arranged opposite to the gear, and the driver is in transmission connection with the locking assembly; the pressure sensor is arranged on the inner side of the restraint ring and used for collecting extrusion force data between the limb of the patient and the restraint ring in real time; and the controller is arranged on the constraint body and is connected with the pressure sensor and the driver. The constraint force is moderate, so that the risk of accidental extubation and the like of a patient due to too loose constraint is avoided; and accidental injuries such as influence on blood circulation of four limbs of the patient due to over-tight restraint are avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a limb restraint device. Background Technology

[0002] In hospitals, treating critically ill patients requires numerous medical procedures to save lives. This is especially true for critically ill patients who have undergone major surgeries such as cardiac surgery, often involving a complex web of life support tubes—endotracheal tubes, central venous catheters, arterial pressure monitoring catheters, various drainage tubes, intra-aortic balloon pumps, and even hemodialysis tubing—all intricately interwoven within their bodies. However, post-operatively, patients often experience altered mental status, agitation, or delirium, leading to involuntary limb movements, lack of cooperation with treatment, and even the risk of catheter dislodgement, posing significant safety hazards.

[0003] To restrict involuntary body or limb movements and prevent the aforementioned dangerous behaviors, medical staff, after failing with non-restraint measures, are forced to use restraints to immobilize the patient's limbs on the bed. Currently, commonly used restraints are mostly made of wide bandages or Velcro. However, relying solely on clinical experience, medical staff manually restrain patients using these bandages. If the restraints are too tight, while effectively restricting movement, it can impair blood circulation in the limbs, potentially leading to subcutaneous hematomas and other injuries. Conversely, if the restraints are too loose, they are ineffective, and the patient still faces the risk of accidental extubation. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, one objective of this invention is to provide a limb restraint device that ensures moderate restraint force, preventing the restraint from being too loose and posing a risk of accidental extubation, while also preventing the restraint from being too tight and affecting blood circulation in the patient's limbs, thus preventing accidental injuries.

[0006] To achieve the above objectives, the present invention proposes a limb restraint device, comprising: a connector, one end of which is connected to a restraint mechanism, and the other end for external fixation; the restraint mechanism, comprising a restraint body, a restraint ring, a gear, a friction plate, a locking assembly, and a driver, wherein the restraint body has a cavity inside, one end of the restraint ring is rotatably connected to the restraint body, and the other end of the restraint ring has a rack segment that meshes with the gear; the locking assembly, the friction plate, and the driver are respectively disposed in the cavity, the gear is disposed on the moving end of the locking assembly, the friction plate is arranged opposite to the gear, and the driver is kinetically connected to the locking assembly. The locking assembly is configured to convert rotational motion into linear motion, driving the gear to move toward or away from the friction plate; the constraint ring includes a locked state and an active state, wherein, in the locked state, the gear abuts against the friction plate and meshes with the rack segment, and in the active state, the gear is disengaged from the friction plate and either meshes with or disengages from the rack segment; a pressure sensor is disposed inside the constraint ring for real-time acquisition of the compressive force data between the patient's limb and the constraint ring; a controller is disposed on the constraint body and connected to the pressure sensor and the driver.

[0007] The limb restraint device of the present invention first securely fixes one end of the connector to an external object (such as a hospital bed frame). Next, the patient's limb (taking the wrist as an example) is placed within the circular locking restraint area formed between the restraint ring and the restraint body. Then, the restraint ring is slowly rotated towards the cavity. During the rotation of the restraint ring, it gradually engages with the gear; simultaneously, the pressure sensor moves closer to the patient's limb as the restraint ring rotates. During this process, the pressure sensor collects real-time data on the pressure between the limb and the restraint ring and sends this data to the controller. Upon receiving the pressure data, the controller compares and analyzes it against a first preset pressure value range. If the controller determines that the pressure data is within the first preset pressure value range, it immediately sends a control signal to the actuator to drive the actuator. After the actuator operates, it drives the locking component, causing the gear and friction plate to come into close contact, and at this time, the gear and rack segment are engaged. At this point, the restraint ring enters a locked state and cannot continue to rotate. The resulting resistance promptly alerts medical personnel that the current restraint force on the patient has reached a suitable level. This design ensures that the restraint force on the patient is moderate, neither too loose, which could lead to the risk of accidental extubation, nor too tight, which could affect the patient's blood circulation in the limbs and cause accidental injury.

[0008] In addition, the limb restraint device proposed in the above application may also have the following additional technical features:

[0009] Specifically, the locking assembly includes a screw, a threaded sleeve, and a one-way bearing, wherein,

[0010] The screw is rotatably connected in the cavity, the threaded sleeve is threadedly connected to the screw, the one-way bearing is connected to the threaded sleeve, the gear is sleeved on the outer wall of the screw, and the gear extends axially to the connecting end, the connecting end is fixedly connected to the inner ring rolling seat of the one-way bearing;

[0011] The driver is connected to the screw drive via a transmission mechanism.

[0012] Specifically, a groove is provided at one end of the threaded sleeve, and the outer ring of the one-way bearing is fixed in the groove.

[0013] Specifically, one end of the friction plate is fixed to the inner wall of the cavity, and the other end of the friction plate is rotatably connected to the screw.

[0014] Specifically, the transmission mechanism includes a worm gear and a worm, the worm gear being fixed to the peripheral wall of the screw, and one end of the worm being connected to the driving end of the driver.

[0015] Specifically, it also includes a rotating rod, one end of which is connected to the worm gear, and the other end of the worm gear extends through the inner wall of the cavity to the outside, and the worm gear is rotatably connected to the inner wall of the cavity.

[0016] Specifically, it also includes a slide bar, a collar, and a connecting block, among which,

[0017] The slide rod is fixed in the cavity, the collar is slidably connected to the slide rod, one end of the connecting block is fixed to the collar, and the other end of the connecting block is fixed to the threaded sleeve.

[0018] Specifically, the connector includes a connecting strap, two fasteners, and two cross plates, wherein,

[0019] The connecting strip has a through hole, and the two horizontal plates are detachably assembled by fasteners to form a closed frame with an opening shape. One of the fasteners passes through the through hole, and the connecting strip is located between the two horizontal plates. The end of the connecting strip away from the horizontal plate is fixed to the constraint body.

[0020] Specifically, there are multiple through holes, and the multiple through holes are arranged at equal intervals along the length direction of the connecting strip.

[0021] Specifically, it also includes an alarm, which is mounted on the constraint body and connected to the controller. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a limb restraint device according to an embodiment of the present invention;

[0025] Figure 2 This is a partial structural schematic diagram of a limb restraint device according to an embodiment of the present invention;

[0026] Figure 3 This is a partial structural schematic diagram of a limb restraint device according to an embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional structural schematic diagram of a gear, a one-way bearing, and a threaded sleeve according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the limb restraint device from another perspective according to the present invention.

[0029] As shown in the figure:

[0030] 1. Connector; 10. Connecting strip; 11. Horizontal plate; 12. Fastener; 100. Through hole;

[0031] 2. Constraint mechanism; 20. Constraint body; 21. Constraint ring; 22. Gear; 23. Friction plate; 24. Locking assembly; 25. Driver; 26. Transmission mechanism; 27. Rotating rod; 200. Cavity; 201. Protrusion; 210. Rack segment; 220. Connecting end; 240. Screw; 241. Threaded sleeve; 242. One-way bearing; 260. Worm gear; 261. Worm; 2410. Groove;

[0032] 3. Pressure sensor; 4. Controller; 5. Alarm; 6. Slide bar; 7. Collar; 8. Connecting block. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0035] The limb restraint device of the present invention will now be described with reference to the accompanying drawings.

[0036] like Figures 1-5 As shown, the limb restraint device of this embodiment of the invention may include a connector 1, a restraint mechanism 2, a pressure sensor 3, and a controller 4.

[0037] In this embodiment, one end of the connector 1 is connected to the restraint mechanism 2, and the other end is used for external fixation. Specifically, in one embodiment, the connector 1 can be in the form of a cloth binding strap, with one end connected to the restraint mechanism 2 and the other end bound to the bed frame. In another embodiment, such as... Figure 1 As shown, the connector 1 may include a connecting strap 10, two fasteners 12, and two horizontal plates 11. The connecting strap 10 has a through hole 100. The two horizontal plates 11 are detachably assembled using the fasteners 12 to form a closed frame. In specific assembly, one fastener 12 passes through the through hole 100, and the connecting strap 10 is placed between the two horizontal plates 11. The end of the connecting strap 10 away from the horizontal plate 11 is fixed to the constraint body 20. Furthermore, the fastener 12 consists of bolts and nuts. In actual operation, the connection between the corresponding bolt and the horizontal plate 11 can be released by rotating one nut, thereby allowing the bed frame to be fitted into the closed frame. Then, the removed nut and bolt are reassembled and fixed to the horizontal plate 11, thus achieving a stable fixation of the connector 1 on the bed frame.

[0038] The constraint mechanism 2 includes a constraint body 20, a constraint ring 21, a gear 22, a friction plate 23, a locking assembly 24, and a driver 25.

[0039] The constraint body 20 has a cavity 200 inside. One end of the constraint ring 21 is rotatably connected to the constraint body 20, and the other end of the constraint ring 21 is provided with a rack segment 210 that meshes with the gear 22. One end of the constraint ring 21 can be rotatably connected to the constraint body 20 by a rivet or a pin.

[0040] Locking assembly 24, friction plate 23, and driver 25 are respectively disposed in cavity 200. Gear 22 is disposed on the moving end of locking assembly 24. Friction plate 23 is arranged relative to gear 22. Driver 25 is connected to locking assembly 24 for transmission. Locking assembly 24 is configured to convert rotational motion into linear motion and drive gear 22 to move toward or away from friction plate 23.

[0041] It should be noted that the driver 25 is a motor with an integrated encoder. With the help of the encoder, the rotation angle of the motor drive end can be accurately detected and the angle information is sent to the controller 4 in real time so that the controller 4 can determine the height position reached by the driver 25 through the locking component 24 driving the gear 22.

[0042] The restraint ring 21 includes a locked state and an active state. In the locked state, gear 22 abuts against friction plate 23 and meshes with rack segment 210. In the active state, gear 22 is separated from friction plate 23 and either meshes with rack segment 210 or is separated from rack segment 210. It can be understood that when gear 22 is separated from friction plate 23 and meshes with rack segment 210, it indicates that the restraint ring 21 is currently being used to restrain the patient's limb. When gear 22 is also separated from friction plate 23 and simultaneously separated from rack segment 210, it means that the restraint ring 21 is currently being used to release the restraint on the patient's limb.

[0043] Pressure sensor 3 is located inside the restraint ring 21 and is used to collect data on the squeezing force between the patient's limb (wrist, ankle, etc.) and the restraint ring 21 in real time. Controller 4 is located on the restraint body 20 and is connected to pressure sensor 3 and driver 25. It can be understood that "inner side" refers to the side of the restraint ring 21 facing the cavity 200.

[0044] It should be noted that the controller 4 can establish a connection with the pressure sensor 3 and the actuator 25 via wired or wireless communication to achieve data interaction. Specifically, wired connection can be achieved by directly connecting wires to ensure stable and reliable signal transmission; while wireless connection can use technologies such as Bluetooth or Wi-Fi, which can be selected according to the flexible needs of the actual application scenario. No specific connection method is limited here.

[0045] Specifically, when performing restraint procedures on a patient's limbs, multiple limb restraint devices can be used as needed. For example, four limb restraint devices can be used to fix the patient's two wrists and two ankles respectively. Of course, other parts of the patient's body can also be flexibly selected for restraint depending on the specific situation.

[0046] In actual operation, first, securely fix one end of the connector 1 to an external object (such as a bed frame). Next, place the patient's limb (taking the wrist as an example) within the circular locking constraint area formed between the constraint ring 21 and the constraint body 20. Then, slowly rotate the constraint ring 21 towards the cavity 200. During the rotation of the constraint ring 21, it gradually engages with the gear 22; simultaneously, the pressure sensor 3 also gradually approaches the patient's limb as the constraint ring 21 rotates. During this process, the pressure sensor 3 collects real-time data on the compressive force between the limb and the constraint ring 21 and sends this data to the controller 4 in real time.

[0047] After receiving the extrusion pressure data, the controller 4 compares and analyzes it with a first preset pressure range (this range can be flexibly set according to actual conditions). If the controller 4 determines that the extrusion pressure data is within the first preset pressure range, it immediately sends a control signal to the driver 25 to drive the driver 25 to run. After the driver 25 runs, it drives the locking component 24, causing the gear 22 and the friction plate 23 to come into close contact, and at this time the gear 22 is engaged with the rack segment 210. At this time, the restraint ring 21 enters the locked state and cannot continue to rotate. The resulting resistance will promptly remind medical staff that the current restraint force on the patient has reached a moderate level.

[0048] This design effectively avoids the problems that medical staff may encounter when manually restraining patients using wide bandages or Velcro straps based solely on clinical experience. This could result in the restraint being too loose, which could lead to the patient accidentally pulling out the tube, or the restraint being too tight, which could affect the blood circulation in the patient's limbs and cause other accidents.

[0049] It should be noted that the controller 4 controls the driver 25 to rotate at a first preset angle. When the gear 22 contacts the friction plate 23, it means that the driving end of the driver 25 has successfully rotated to the preset angle and completed the predetermined rotation task. The constraint ring 21 enters the locked state. The controller 4 is connected to an external mobile terminal so that the external mobile terminal can control the driver 25 to run through the controller 4.

[0050] Furthermore, when it is necessary to release the restraints on the patient's limbs, the operator can send control commands to the controller 4 via a mobile terminal. Upon receiving the command, the controller 4, according to a pre-set program, issues precise operating commands to the actuator 25, causing it to rotate to a specific angle. The power generated by the rotation of the actuator 25 is transmitted to the locking assembly 24, which in turn drives the gear 22 to move to the preset unlocked position. In this position, the gear 22 is simultaneously separated from the friction plate 23 and the rack segment 210. At this time, simply rotating the restraint ring 21 away from the cavity 200 will easily release the restraints on the patient's limbs.

[0051] Furthermore, such as Figure 1 As shown, the limb restraint device of the present invention also includes an alarm 5, which is installed on the restraint body 20 and is connected to the controller 4.

[0052] Specifically, when the constraint ring 21 enters the locked state, the controller 4 monitors the time according to a preset interval (e.g., 1 minute). Once the duration of the current locked state exceeds the preset interval, the controller 4 controls the driver 25 to rotate in the reverse direction. As the driver 25 rotates in the reverse direction, the gear 22 gradually returns to its initial position. At this time, the gear 22 separates from the friction plate 23, while the gear 22 remains engaged with the rack segment 210. The constraint ring 21 also returns to the active state, and can only rotate in one direction toward the cavity 200.

[0053] If the patient subsequently becomes unconscious or agitated, their body will swing uncontrollably back and forth, potentially touching the restraint ring 21. During this contact, the restraint ring 21 will continuously rotate towards the cavity 200. When the restraint ring 21 rotates to a pressure within the second preset pressure range, the controller 4 will react quickly, immediately sending a control signal to the actuator 25 to drive it. After the actuator 25 starts, it will activate the locking assembly 24, causing the gear 22 to engage tightly with the friction plate 23, while the gear 22 and rack segment 210 remain meshed. In this way, the restraint ring 21 will re-enter the locked state, preventing excessive pressure, maintaining appropriate tightness, and avoiding accidental injuries such as affecting the patient's blood circulation. At the same time, the controller 4 will also control the alarm 5 to emit a loud alarm sound, promptly alerting relevant medical staff that the patient has entered a worsening state of unconsciousness or agitation, allowing medical staff to increase patrols and provide timely treatment, maximizing patient safety.

[0054] It should be noted that the first preset pressure value range is smaller than the second preset pressure value range. Furthermore, when the pressure data is within the second preset pressure value range, the controller 4 will subsequently stop executing the relevant program, keeping the restraint ring 21 in a locked state until medical personnel come to unlock it, thereby effectively preventing the restraint ring 21 from re-entering the active state and ensuring the patient's safety and the effectiveness of the restraint.

[0055] In other words, the pressure sensor 3, controller 4, and actuator 25 work together to ensure that the restraint applied to the patient is just right, minimizing the risk of accidental injury due to improper restraint. Furthermore, by using changes in pressure data, the patient's condition can be monitored and assessed in real time, enabling medical staff to strengthen rounds and take timely action, thus maximizing patient safety.

[0056] Furthermore, to effectively reduce the rigid pressure damage to the patient caused by the restraint ring 21 and restraint body 20 during the locking process, a sponge pad can be used to wrap the inner side of the restraint body 20 and the area on the inner side of the restraint ring 21 that avoids the location of the pressure sensor 3. In this way, when the restraint ring 21 and restraint body 20 restrain the patient's limbs, the sponge pad can play a good cushioning role, greatly improving the comfort of the restraint strap and maintaining the patient's dignity.

[0057] In one embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 As shown, the locking assembly 24 includes a screw 240, a threaded sleeve 241, and a one-way bearing 242, wherein the threaded sleeve 241 and the one-way bearing 242 together form the moving end of the locking assembly 24 described above.

[0058] The screw 240 is rotatably connected in the cavity 200, the threaded sleeve 241 is threadedly connected to the screw 240, the one-way bearing 242 is connected to the threaded sleeve 241, the gear 22 is sleeved on the outer wall of the screw 240, and the gear 22 extends axially to the connecting end 220, which is fixedly connected to the inner ring rolling seat of the one-way bearing 242. The driver 25 is connected to the screw 240 through the transmission mechanism 26.

[0059] It should be noted that the one-way bearing 242 possesses a unique one-way transmission characteristic—it can rotate freely in a preset direction, while automatically triggering a locking mechanism in the opposite direction to ensure that power can only be transmitted in one direction and effectively prevent reverse movement. (Refer to specific design details). Figure 2 This characteristic restricts gear 22 to rotating only counterclockwise, while locking in the clockwise direction. When the rack segment 210 of the restraint ring 21 meshes with gear 22, the rotation direction of the restraint ring 21 is strictly constrained to a unidirectional movement toward the cavity 200, thereby providing a highly stable restraint effect during patient fixation and avoiding the risk of the restraint ring 21 disengaging from gear 22 due to reverse loosening. Furthermore, this unidirectional rotation mechanism also provides an auxiliary function for detecting the patient's restraint status, ensuring that the compressive force increases progressively.

[0060] Specifically, when the driver 25 starts, its power is transmitted to the screw 240 through the transmission mechanism 26, driving the screw 240 to rotate. The rotation of the screw 240 further drives the threaded sleeve 241, which is threaded to it, to make linear displacement along the axial direction. During this process, the threaded sleeve 241 drives the gear 22 to move through the one-way bearing 242. When the threaded sleeve 241 moves towards the friction plate 23, the one-way bearing 242 allows the gear 22 to move synchronously and press against the friction plate 23, realizing the locking state of the constraint ring 21; when the threaded sleeve 241 moves in the opposite direction, it drives the gear 22 to disengage from the friction plate 23 through the one-way bearing 242, thereby restoring the constraint ring 21 to a rotatable state.

[0061] In one embodiment of the present invention, such as Figure 4 As shown, a groove 2410 is provided at one end of the threaded sleeve 241, and the outer ring of the one-way bearing 242 is fixed in the groove 2410.

[0062] In the above scheme, by setting the groove 2410, the contact area between the one-way bearing 242 and the threaded sleeve 241 can be increased, thereby improving the stability when the two are fixed.

[0063] In one embodiment of the present invention, such as Figure 3 As shown, one end of the friction plate 23 is fixed to the inner wall of the cavity 200, and the other end of the friction plate 23 is rotatably connected to the screw 240.

[0064] In the above scheme, one end of the screw 240 is rotatably connected to the inner wall of the cavity 200 to form the first fixed point, and the other end of the screw 240 is rotatably connected to the friction plate 23. The friction plate 23 forms a second fixed point for the screw 240, forming a double fixed point support to prevent the screw 240 from radially running, thereby ensuring the stability of the screw 240 during rotation.

[0065] In one embodiment of the present invention, such as Figure 3 As shown, the transmission mechanism 26 includes a worm gear 260 and a worm 261. The worm gear 260 is fixed on the peripheral wall of the screw 240, and one end of the worm 261 is connected to the driving end of the driver 25.

[0066] Specifically, the worm 261 can be driven to rotate by the driver 25. When the worm 261 rotates, it can drive the worm wheel 260 to drive the screw 240 to rotate. The worm wheel 260 and the worm 261 can not only realize transmission, but also use the self-locking ability of the worm wheel 260 and the worm 261 to ensure that the screw 240 will not rotate after the driver 25 stops running, thereby ensuring the stability of the position of the gear 22.

[0067] Furthermore, it can be referred to Figure 5The cavity 200 is stamped with a protrusion 201 in the direction away from the friction plate 23. The internal area formed by the stamping of the protrusion 201 is connected to the cavity 200, which can provide mounting space in the height direction for the driver 25 and the screw 240.

[0068] In one embodiment of the present invention, such as Figure 3 As shown, the limb restraint device also includes a rotating rod 27, one end of which is connected to a worm gear 261, and the other end of the worm gear 261 extends through the inner wall of the cavity 200 to the outside, and the worm gear 261 is rotatably connected to the inner wall of the cavity 200.

[0069] Specifically, when it is necessary to release the restraints of the limb restraint device on the patient's limbs, the rotating rod 27 can be operated to drive the screw 240 to rotate via the worm gear 260. This drives the screw 240 to rotate, causing the threaded sleeve 241 to work with the one-way bearing 242 to drive the gear 22 to move away from the friction plate 23. This causes the gear 22 to disengage from the rack section 210 and separate from the restraint ring 21.

[0070] Furthermore, the limb restraint device can continue to be used even if the actuator 25 fails, further expanding its practicality.

[0071] In one embodiment of the present invention, such as Figure 3 As shown, the limb restraint device also includes a slide rod 6, a collar 7, and a connecting block 8. The slide rod 6 is fixed in the cavity 200, the collar 7 is slidably connected to the slide rod 6, one end of the connecting block 8 is fixed to the collar 7, and the other end of the connecting block 8 is fixed to the threaded sleeve 241.

[0072] In the above scheme, by setting a collar 7 to connect to the threaded sleeve 241 through the connecting block 8, and by the collar 7 cooperating with the slide rod 6 to limit the angle of the threaded sleeve 241, the stability of the threaded sleeve 241 moving in a straight line is ensured and there is no rotation.

[0073] In one embodiment of the present invention, such as Figure 1 As shown, there are multiple through holes 100, and the multiple through holes 100 are arranged at equal intervals along the length direction of the connecting strip 10.

[0074] In the above scheme, by setting multiple through holes 100 and flexibly inserting detachable fasteners 12, the range of restraint can be adjusted. The distance between the restraint mechanism 2 and the bed frame can be selected according to the position of the fastener 12 inserted into the through hole 100, thereby adjusting the range of motion of the restraint on the patient's limbs. The closer the restraint mechanism 2 is to the bed frame, the greater the restraint on the limbs. It can be selected according to the thickness of the patient's limbs, which is a humanized design that maximizes the comfort of the restraint strap and maintains the dignity of the patient.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A limb restraint device, characterized in that, include: The connector has one end connected to the restraint mechanism and the other end used for external fixation. The constraint mechanism includes a constraint body, a constraint ring, gears, friction plates, locking components, and a driver. The constraint body has a cavity inside, one end of the constraint ring is rotatably connected to the constraint body, and the other end of the constraint ring is provided with a rack segment that meshes with the gear. The locking assembly, the friction plate, and the driver are respectively disposed in the cavity. The gear is disposed on the moving end of the locking assembly. The friction plate is arranged relative to the gear. The driver is connected to the locking assembly in a transmission manner. The locking assembly is configured to convert rotational motion into linear motion and drive the gear to move toward or away from the friction plate. The constraint ring includes a locked state and an active state. In the locked state, the gear abuts against the friction plate and meshes with the rack segment. In the active state, the gear is disengaged from the friction plate and either meshes with the rack segment or is disengaged from the rack segment. A pressure sensor is installed inside the restraint ring to collect real-time data on the compressive force between the patient's limb and the restraint ring. A controller is mounted on the constraint body and connected to the pressure sensor and the actuator.

2. The limb restraint device according to claim 1, characterized in that, The locking assembly includes a screw, a threaded sleeve, and a one-way bearing, wherein... The screw is rotatably connected in the cavity, the threaded sleeve is threadedly connected to the screw, the one-way bearing is connected to the threaded sleeve, the gear is sleeved on the outer wall of the screw, and the gear extends axially to the connecting end, the connecting end is fixedly connected to the inner ring rolling seat of the one-way bearing; The driver is connected to the screw drive via a transmission mechanism.

3. The limb restraint device according to claim 2, characterized in that, The threaded sleeve has a groove at one end, and the outer ring of the one-way bearing is fixed in the groove.

4. The limb restraint device according to claim 2, characterized in that, One end of the friction plate is fixed to the inner wall of the cavity, and the other end of the friction plate is rotatably connected to the screw.

5. The limb restraint device according to claim 4, characterized in that, The transmission mechanism includes a worm gear and a worm. The worm gear is fixed on the peripheral wall of the screw, and one end of the worm is connected to the driving end of the driver.

6. The limb restraint device according to claim 5, characterized in that, It also includes a rotating rod, one end of which is connected to the worm gear, and the other end of the worm gear extends through the inner wall of the cavity to the outside, and the worm gear is rotatably connected to the inner wall of the cavity.

7. The limb restraint device according to claim 2, characterized in that, It also includes a slide bar, a collar, and a connecting block, among which, The slide rod is fixed in the cavity, the collar is slidably connected to the slide rod, one end of the connecting block is fixed to the collar, and the other end of the connecting block is fixed to the threaded sleeve.

8. The limb restraint device according to claim 1, characterized in that, The connector includes a connecting strap, two fasteners, and two cross plates, wherein... The connecting strip has a through hole, and the two horizontal plates are detachably assembled by fasteners to form a closed frame with an opening shape. One of the fasteners passes through the through hole, and the connecting strip is located between the two horizontal plates. The end of the connecting strip away from the horizontal plate is fixed to the constraint body.

9. The limb restraint device according to claim 8, characterized in that, There are multiple through holes, and the multiple through holes are arranged at equal intervals along the length direction of the connecting strip.

10. The limb restraint device according to claim 1, characterized in that, It also includes an alarm, which is mounted on the constraint body and connected to the controller.

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