Lossless transferring device for transferring body position of critical patient

Abstract

The invention relates to the technical field of medical auxiliary instruments, and discloses a lossless transfer device for body position transfer of critical patients, which comprises a transfer support, a lifting mechanism is arranged at the bottom of the transfer support, a lower body assembly is mounted on the inner wall of the transfer support, and an upper body assembly is rotatably connected to the outer side of the lower body assembly. The outer side of the lower half body assembly and the outer side of the upper half body assembly are each provided with a movable insertion assembly, a tilting assembly, an unwinding mechanism and a conveying assembly, each unwinding mechanism comprises two second gears and a diaphragm capsule, the outer sides of the second gears are fixedly connected with connecting shafts, the outer sides of the connecting shafts are fixedly connected with round blocks, the outer sides of the round blocks are rotationally connected with pawls, and the pawls are fixedly connected with the lower half body assembly. And a rolling rod is rotationally connected to the interior of the diaphragm capsule. The special body position of a critical patient can be kept, cross infection is prevented through sterile membrane isolation, the insertion resistance is reduced through the slight tilting action, and safe and lossless bed transferring is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical assistive device technology, specifically a non-destructive bed transfer device for the positional transfer of critically ill patients. Background Technology

[0002] In clinical nursing care within intensive care units and operating rooms, critically ill patients frequently require repositioning between beds, transport vehicles, CT scan tables, or operating tables. Because critically ill patients are typically weak, have unstable vital signs, or suffer severe traumatic fractures, the repositioning process demands extremely high levels of stability, safety, and a sterile environment.

[0003] Currently, the most common methods of transferring patients to a bed in clinical practice rely on manual handling by medical staff or the use of auxiliary tools such as slides or transfer devices. However, existing rigid slides or shovel-type transfer devices often require overcoming significant static friction when inserted under the patient. This rigid insertion method can easily cause compression and vibration to the patient's body, which can easily lead to secondary injury or increase pain for patients with spinal cord injuries, multiple fractures, or unhealed postoperative wounds. Even with conveyor belt-type electric transfer devices, the front end can easily get caught in the sheets or push against the patient's skin during insertion, lacking a mechanism that can reduce static friction and facilitate gentle insertion through mechanical action.

[0004] Furthermore, many critically ill patients require specific body positions due to their conditions. For example, patients with traumatic brain injury or cerebral hemorrhage need to keep their heads elevated at approximately 30 degrees to facilitate venous return and reduce intracranial pressure; patients with heart failure or respiratory failure need to maintain a semi-recumbent position to improve ventilation. Most existing bed transfer devices are single-piece planar structures, lacking segmented angle adjustment capabilities. When transferring such patients, medical staff often have to temporarily lay them flat, which not only increases patient discomfort but may also cause intracranial pressure fluctuations or respiratory distress due to the brief change in position, threatening the patient's life.

[0005] Finally, preventing cross-infection within the hospital is of paramount importance in intensive care. Existing electric bed transfer devices typically use reusable, fixed materials for their conveyor belts. While these can be wiped clean and disinfected, complete sterilization is difficult to guarantee during high-frequency emergency transfers. Furthermore, the patient's skin is in direct contact with the conveyor belt, which can easily lead to relative sliding friction during movement, causing skin damage or worsening pressure sores in critically ill patients with fragile skin. Current technological solutions lack an integrated device that can automatically and synchronously change the sterile contact medium while transporting the patient, thus achieving both physical isolation to prevent infection and avoiding relative friction. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a non-destructive bed transfer device for the positional transfer of critically ill patients. This device solves the problems of existing bed transfer equipment, such as high frictional resistance when inserted under the patient, which can easily cause secondary damage; difficulty in meeting the needs of critically ill patients to maintain a specific head-elevated position during transfer; and high risk of cross-infection due to the inability of the contact surfaces to be automatically and synchronously replaced.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-destructive bed transfer device for the position transfer of critically ill patients, comprising a bed transfer bracket, a lifting mechanism at the bottom of the bed transfer bracket, a lower body assembly installed on the inner wall of the bed transfer bracket, an upper body assembly rotatably connected to the outer side of the lower body assembly, and a movable insertion component, a tilting component, an unwinding mechanism, and a conveying component provided on the outer sides of both the lower body assembly and the upper body assembly; The unwinding mechanism includes two second gears and a film box. A connecting shaft is fixedly connected to the outside of the second gears. A circular block is fixedly connected to the outside of the connecting shaft. A ratchet is rotatably connected to the outside of the circular block. A winding rod is rotatably connected inside the film box. A sterile film is disposed on the outside of the winding rod. One end of the sterile film is fixedly connected to the outside of the upper winding rod, and the other end of the sterile film is fixedly connected to the outside of the lower winding rod. A rotating disk is fixedly connected to the outside of the winding rod. A ratchet groove is formed inside the rotating disk. A first spring is fixedly connected to the inner wall of the ratchet groove and the outside of the circular block.

[0008] Preferably, the lifting assembly includes a second fixing block, a protective cover fixedly connected to the outer side of the second fixing block, a toggle lever rotatably connected inside the second fixing block, a second synchronous wheel fixedly connected to the outer side of the toggle lever, a plurality of protrusions fixedly connected to the outer side of the toggle lever, an outer cover fixedly connected to the inner wall of the protective cover, a reciprocating shaft rotatably connected inside the outer cover, a spring-loaded spring sleeved on the outer side of the reciprocating shaft, one end of the spring-loaded spring fixedly connected to the inner wall of the outer cover, the other end of the spring-loaded spring fixedly connected to the outer side of the reciprocating shaft, a shovel head fixedly connected to the outer side of the reciprocating shaft, a toggle lever opened inside the shovel head, an abutment block fixedly connected to the upper side of the inner wall of the toggle lever, and the protrusions abutting against the abutment block.

[0009] Preferably, the adjustment component includes a movable plate and a first motor. The movable plate is disposed on the outer side of the lower part of the upper body component. The first motor is fixedly connected to the outer side of the bed support. A sliding groove is provided inside the movable plate. A first lead screw is fixedly connected to the output end of the first motor. A first fixing block is fixedly connected to the outer side of the first lead screw. An adjustment rod is rotatably connected between the outer side of the first fixing block and the bottom of the movable plate.

[0010] Preferably, the lifting assembly includes a movable bracket, the top of which is fixedly connected to the bottom of the transducer bracket. A second motor is fixedly connected to the outside of the movable bracket, and a second lead screw is fixedly connected to the output end of the second motor. A movable rod is threadedly connected to the outside of the second lead screw. Both ends of the movable rod are rotatably connected to a first rotating rod, and a second rotating rod is rotatably connected to the outside of the first rotating rod. One end of the second rotating rod is rotatably connected to the outside of the movable bracket, and the other end of the second rotating rod is rotatably connected to a first slider. The outside of the first slider is slidably connected to the bottom of the transducer bracket. One end of the first rotating rod is rotatably connected to the top of the transducer bracket, and the other end of the first rotating rod is rotatably connected to a second slider. The outside of the second slider is slidably connected to the outside of the movable bracket.

[0011] Preferably, the movable insertion assembly includes a link block and a fixed armature block. The outer sides of both the link block and the fixed armature block are fixedly connected to the top of the bed support. A third motor is fixedly connected to the inner wall of the link block. A third lead screw is fixedly connected to the output end of the third motor. A limit block is threadedly connected to the outer side of the third lead screw. The limit block is slidably connected to the outer side of the link block. A limit rod is fixedly connected to the inside of the fixed armature block. A connecting block is slidably connected to the outer side of the limit rod. The connecting block is fixedly connected to the outer side of the diaphragm box.

[0012] Preferably, the conveying mechanism includes a thin shell and a driven shaft. The driven shaft is rotatably connected to the inside of the second fixed block on the outside. The thin shell is fixedly connected to the outside of the limiting block on the outside. A fourth motor is fixedly connected to the inner wall of the thin shell. A drive shaft is fixedly connected to the output end of the fourth motor. A first gear is fixedly connected to the outside of the drive shaft. A first synchronous pulley is fixedly connected to the outside of the driven shaft.

[0013] Preferably, the outer side of the membrane box is fixedly connected to the outer side of the thin shell, and the outer side of the second fixing block is fixedly connected to the outer side of the thin shell.

[0014] Preferably, the first synchronous pulley and the second synchronous pulley are driven by a synchronous belt.

[0015] Preferably, the pawl engages with the ratchet groove, the outer side of the ratchet groove is rotatably connected to the outer side of the diaphragm box, and the first gear meshes with the two second gears.

[0016] Preferably, a transmission belt is provided between the ratchet groove and the drive shaft, and the sterile membrane is attached to the transmission belt.

[0017] This invention provides a non-invasive bed transfer device for the positioning and transfer of critically ill patients. It has the following beneficial effects: 1. This invention utilizes the mechanical linkage between the lifting component and the conveying component. By periodically abutting the protrusion on the lever against the abutting block inside the shovel head, and cooperating with the elastic reset effect of the spring, the front end of the shovel head produces a slight reciprocating lifting motion during the conveying process. This reciprocating motion effectively reduces the static friction resistance when the device cuts under the patient, and can assist in separating the sheet from the bed surface, allowing the device to smoothly cut under the patient. This avoids the squeezing or vibration caused to the body of critically ill patients by traditional rigid insertion methods, significantly improving the comfort and safety of the bed transfer process, and achieving non-destructive transfer.

[0018] 2. This invention integrates a synchronously driven unwinding mechanism, which distributes the rotational power of the drive shaft to the winding rod through a gear set, and uses the cooperation of the pawl and ratchet groove to prevent the sterile membrane from loosening, ensuring that the sterile membrane moves synchronously and closely against the surface of the transmission belt. This creates a renewable isolation layer between the device and the patient, which not only effectively prevents nosocomial cross-infection and meets the sterility requirements of the intensive care environment, but also avoids relative sliding between the patient's skin and the delivery surface by utilizing the follow-up characteristics of the sterile membrane, preventing skin damage or pressure sores caused by shearing force.

[0019] 3. This invention employs an adjustment component structure consisting of a movable plate and a sliding groove. When adjusting the angle of the upper body component, the movable plate is driven upward by a lead screw, while the bottom of the upper body component slides freely within the sliding groove of the movable plate to compensate for the displacement difference. This structure can smoothly adjust and maintain the patient's upper body at a 30-degree elevation, solving the problem of certain critically ill patients with traumatic brain injury, respiratory failure, etc., who cannot lie flat on the bed. It avoids intracranial pressure fluctuations or respiratory distress caused by changes in body position, ensuring the stability of vital signs for patients with limited body position during transport. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the movable support of the present invention; Figure 3 This is a schematic diagram of the lifting mechanism of the present invention; Figure 4 This is a schematic diagram of the second fixing block of the present invention; Figure 5 This is a schematic diagram of the membrane box of the present invention; Figure 6 This is a schematic diagram of the first gear of the present invention; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the second gear of the present invention; Figure 9 This is a schematic diagram of the limiting rod of the present invention; Figure 10 This is a schematic diagram of the spring spring of the present invention.

[0021] The components include: 1. Overhead support; 2. Moving plate; 3. Adjusting rod; 4. First fixing block; 5. First lead screw; 6. First motor; 7. Moving support; 8. Second motor; 9. Second lead screw; 10. Moving rod; 11. First rotating rod; 12. Second rotating rod; 13. First slider; 14. Lower body assembly; 15. Upper body assembly; 16. Connecting block; 17. Third motor; 18. Third lead screw; 19. Limiting block; 20. Thin shell; 21. Fourth motor; 22. Protective shell; 23. First gear; 24. Second gear; 25. Connecting shaft; 26. 1. Rotating disc; 27. Ratchet groove; 28. Circular block; 29. ​​Pawl; 30. First spring; 31. Winding rod; 32. Sterile membrane; 33. Membrane box; 34. Spring spring; 35. Drive shaft; 36. Transmission belt; 37. Driven shaft; 38. Fixed arm; 39. Limiting rod; 40. Connecting block; 41. First synchronous pulley; 42. Second synchronous pulley; 43. Protective cover; 44. Actuating rod; 45. Protrusion; 46. Abutment block; 47. Rotating groove; 48. Shovel head; 49. Reciprocating shaft; 50. Outer cover; 51. Second fixed block; 52. Second slider. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 - Appendix Figure 10 This invention provides a non-destructive bed transfer device for the position transfer of critically ill patients, including a bed transfer bracket 1. A lifting mechanism is provided at the bottom of the bed transfer bracket 1. A lower body component 14 is installed on the inner wall of the bed transfer bracket 1. An upper body component 15 is rotatably connected to the outside of the lower body component 14. A movable insertion component, a tilting component, an unwinding mechanism, and a conveying component are provided on the outside of both the lower body component 14 and the upper body component 15. The unwinding mechanism includes two second gears 24 and a film box 33. A connecting shaft 25 is fixedly connected to the outside of the second gears 24. A circular block 28 is fixedly connected to the outside of the connecting shaft 25. A ratchet 29 is rotatably connected to the outside of the circular block 28. A winding rod 31 is rotatably connected inside the film box 33. A sterile film 32 is provided on the outside of the winding rod 31. One end of the sterile film 32 is fixedly connected to the outside of the upper winding rod 31, and the other end of the sterile film 32 is fixedly connected to the outside of the lower winding rod 31. A rotating disk 26 is fixedly connected to the outside of the winding rod 31. A ratchet groove 27 is opened inside the rotating disk 26. A first spring 30 is fixedly connected to the inner wall of the ratchet groove 27 and the outside of the circular block 28.

[0024] Specifically, the bed transfer frame 1 serves as the main support skeleton of the entire device, bearing the mechanical structural load and the patient's weight, ensuring the structural stability of the device during operation. The lifting mechanism located at the bottom of the bed transfer frame 1 is used to adjust the overall height of the device to adapt to beds, operating tables, or transport vehicles of different heights, ensuring that the bed transfer operation is carried out in a horizontal state. As for the specific drive method of the lifting mechanism, such as electric push rod, scissor structure, or hydraulic cylinder, those skilled in the art can select conventional lifting drive components according to actual needs. Its specific internal structure and control principle are well-known technologies in the field and will not be described in detail here.

[0025] The lower body assembly 14 is used to support the legs and pelvic region of critically ill patients, providing a stable support platform. The upper body assembly 15, which is rotatably connected to the outside of the lower body assembly 14, is used to support the patient's torso and head. The rotatable connection between the two is designed to allow for adjustment of the patient's back angle to accommodate the needs of patients with breathing difficulties or traumatic brain injury who require specific body positions. The adjustment component located on the outside of the lower body assembly 14 is used to drive the upper body assembly 15 to deflect relative to the lower body assembly 14, thereby achieving precise control of the upper body elevation angle, such as maintaining a 30-degree semi-recumbent position.

[0026] The moving insertion component is used to drive the functional module to extend and retract in the horizontal direction, enabling the device to cut into or out of the patient's body without moving the patient; the conveying component is used to provide circumferential driving force to the contact surface, driving the patient to move through the movement of the surface medium; the lifting component is used to generate a slight lifting or deformation of the front end of the device through mechanical linkage during the operation of the conveying component, assisting the device to "shovel" into the patient's body or prevent the bed sheet from getting caught; the unwinding mechanism is used to store, release and recycle the sterile membrane 32, ensuring the cleanliness of the contact surface each time it is used on a different bed or for a different patient.

[0027] Regarding the specific implementation of the unwinding mechanism, the membrane box 33 provides outer shell protection for the internal winding components and the sterile membrane 32 to prevent dust contamination and mechanical damage; the winding rod 31 is used to wind and tension the sterile membrane 32, and the membrane is unwound and retracted through its own rotation; the sterile membrane 32, as a medium that comes into direct contact with the patient's body and the bed surface, is used to isolate the device body from the patient and prevent cross-infection. One end of the membrane 32 is fixed to the upper winding rod 31, and the other end is fixed to the lower winding rod 31, thereby forming a recirculating isolation layer on the surface of the device.

[0028] In terms of drive transmission, the second gear 24 is used to receive rotational torque from the conveying component or independent power source; the coupling shaft 25 is used to stably transmit the rotation of the second gear 24 to the circular block 28; the circular block 28 serves as the mounting carrier for the pawl 29 and rotates synchronously with the coupling shaft 25; the pawl 29, rotatably connected to the outside of the circular block 28, is used to cooperate with the ratchet groove 27 to achieve unidirectional transmission or intermittent motion control, ensuring that the sterile membrane 32 will not loosen in the reverse direction when subjected to force; the rotating disk 26 is used to connect the ratchet groove 27 and the winding rod 31, converting the thrust from the pawl 29 into the rotational power of the winding rod 31; the ratchet groove 27, opened inside the rotating disk 26, is used to accommodate the pawl 29 and provide a force application surface; the first spring 30, connected between the inner wall of the ratchet groove 27 and the outer side of the circular block 28, is used to provide elastic restoring force or buffering force, ensuring flexible contact and reliable meshing between the pawl 29 and the ratchet groove 27, preventing mechanical jamming or rigid damage to parts during high-speed operation or sudden load changes.

[0029] Please see the appendix Figure 10 The lifting assembly includes a second fixing block 51, a protective cover 43 fixedly connected to the outside of the second fixing block 51, a toggle lever 44 rotatably connected inside the second fixing block 51, a second synchronous wheel 42 fixedly connected to the outside of the toggle lever 44, and multiple protrusions 45 fixedly connected to the outside of the toggle lever 44. An outer cover 50 is fixedly connected to the inner wall of the protective cover 43, a reciprocating shaft 49 is rotatably connected inside the outer cover 50, a spring 34 is sleeved on the outside of the reciprocating shaft 49, one end of the spring 34 is fixedly connected to the inner wall of the outer cover 50, and the other end of the spring 34 is fixedly connected to the outside of the reciprocating shaft 49. A shovel head 48 is fixedly connected to the outside of the reciprocating shaft 49, a toggle lever 44 is opened inside the shovel head 48, and an abutment block 46 is fixedly connected to the upper side of the inner wall of the toggle lever 44. The protrusions 45 and the abutment block 46 abut against each other.

[0030] Specifically, the second fixing block 51 serves as a basic support component for the tilting assembly, providing an installation shaft for the internal rotating parts and ensuring coaxiality and stability during transmission. The protective cover 43 fixed to the outside of the second fixing block 51 forms a closed mechanical chamber, preventing external foreign objects from entering the transmission mechanism and also preventing internal lubricating grease from leaking out, thus ensuring the cleanliness of the mechanism during long-term operation.

[0031] The second synchronous pulley 42 is used to receive rotational power from the transmission system, such as input through the synchronous belt, and transmit the power to the actuating lever 44; the actuating lever 44, which is rotatably connected inside the second fixed block 51, serves as the drive shaft 35, which carries and drives multiple protrusions 45 to perform circumferential motion; the multiple protrusions 45 arranged on the outside of the actuating lever 44 are distributed in a cam-like or paddle-like manner, which are used to convert the continuous rotational motion of the actuating lever 44 into periodic thrust, and are the core triggering element for generating intermittent tilting action.

[0032] The outer cover 50 provides a rotational support point for the reciprocating shaft 49 and defines the swing center of the shovel head 48. The reciprocating shaft 49 serves as the swing fulcrum axis of the shovel head 48, allowing the shovel head 48 to reciprocate around its axis at a certain angle. The shovel head 48 is an execution component that directly contacts the bed surface or cuts under the patient. The space reserved inside the shovel head 48 is used to accommodate the lever 44 and the protrusion 45, ensuring that the internal transmission does not interfere with the external structure. The abutment block 46 fixed on the upper side of the inner wall of the shovel head 48 serves as a force-bearing point to withstand the pushing force generated when the protrusion 45 rotates.

[0033] The spring 34, acting as an elastic reset element, has one end anchored to the inner wall of the outer cover 50 and the other end connected to the reciprocating shaft 49. It stores elastic potential energy and provides reverse torque. During operation, when the actuating lever 44 drives the protrusion 45 to rotate until it contacts the abutment block 46, the protrusion 45 pushes the abutment block 46, forcing the shovel head 48 to overcome the resistance of the spring 34 and tilt upwards around the reciprocating shaft 49. After the protrusion 45 passes the abutment block 46, it loses its thrust, and the spring 34 releases its elastic force to drive the reciprocating shaft 49 to rotate, thus resetting the shovel head 48. This cycle repeats, achieving the reciprocating tilting action of the front end of the shovel head 48 to assist the device in breaking static friction or separating the bed sheet. The specific material selection and stiffness calculation of the spring 34 can be set by those skilled in the art according to actual load requirements. This is a well-known technology in the field and will not be elaborated here.

[0034] Please see the appendix Figure 3 The adjustment component includes a movable plate 2 and a first motor 6. The outer side of the movable plate 2 is located at the lower part of the upper body component 15. The outer side of the first motor 6 is fixedly connected to the outer side of the bed support 1. The movable plate 2 has a sliding groove inside. The output end of the first motor 6 is fixedly connected to a first lead screw 5. The outer side of the first lead screw 5 is fixedly connected to a first fixing block 4. An adjustment rod 3 is rotatably connected between the outer side of the first fixing block 4 and the bottom of the movable plate 2.

[0035] Specifically, the first motor 6 is used as the main power source of the adjustment component, outputting rotational torque to drive the mechanical transmission system. By controlling its speed and direction, precise control of the speed and angle of the patient's upper body lifting can be achieved. As for the specific selection of the first motor 6, such as a servo motor or a high-torque stepper motor and its drive control circuit, those skilled in the art can make conventional designs according to actual load requirements. This is a well-known technology in the field and will not be described in detail here.

[0036] The first lead screw 5 is used to convert the rotational motion output by the first motor 6 into linear motion. Its threaded structure design usually has a self-locking function, which is used to lock the position of the mechanism when the motor stops working, to prevent the upper body component 15 from accidentally falling back or sliding at an angle under the action of the patient's gravity.

[0037] The first fixed block 4, acting as a nut pair or movable slider that cooperates with it, is used to move axially reciprocally under the drive of the first lead screw 5, thereby changing the position of the force point at the lower end of the adjusting rod 3 and converting the rotational driving force into a horizontal displacement driving force.

[0038] The adjusting rod 3, as a rigid linkage mechanism, is used to connect the first fixed block 4 and the moving plate 2, converting the horizontal displacement of the first fixed block 4 into an oblique or vertical thrust on the moving plate 2, and adjusting the height position of the moving plate 2 by changing the inclination angle of the linkage.

[0039] The movable plate 2 is used to directly contact and support the bottom structure of the upper body assembly 15, and transmits the thrust from the adjusting rod 3 to the upper body assembly 15, forcing it to rotate around the rotation center to achieve back lifting; the sliding groove set inside the movable plate 2 is used to construct a sliding pair, which accommodates the driven part at the bottom of the upper body assembly 15, such as a slider or pin, during the upward lifting process of the movable plate 2, allowing the two to generate the necessary relative displacement on the contact surface, thereby compensating for the trajectory difference between the upper body assembly 15 when making arc motion and the movable plate 2 when making straight or oblique motion, eliminating the dead point of the mechanism, and ensuring that the angle adjustment process is smooth and without mechanical interference.

[0040] Please see the appendix Figure 3The lifting assembly includes a movable support 7, the top of which is fixedly connected to the bottom of the bed frame 1. A second motor 8 is fixedly connected to the outside of the movable support 7. A second lead screw 9 is fixedly connected to the output end of the second motor 8. A movable rod 10 is threadedly connected to the outside of the second lead screw 9. A first rotating rod 11 is rotatably connected to both ends of the movable rod 10. A second rotating rod 12 is rotatably connected to the outside of the first rotating rod 11. One end of the second rotating rod 12 is rotatably connected to the outside of the movable support 7. The other end of the second rotating rod 12 is rotatably connected to a first slider 13. The outside of the first slider 13 is slidably connected to the bottom of the bed frame 1. One end of the first rotating rod 11 is rotatably connected to the top of the bed frame 1. The other end of the first rotating rod 11 is rotatably connected to a second slider 52. The outside of the second slider 52 is slidably connected to the outside of the movable support 7.

[0041] Specifically, the movable support 7 serves as the basic load-bearing frame for the lifting assembly, providing a mounting base and guide trajectory for the drive unit and transmission linkage. It also serves as a reference base for relative movement with the over-bed support 1, bearing the reaction force during the lifting process of the device. The second motor 8 provides the rotational power required for lifting and drives the transmission system through output torque. The specific control logic and circuit connection of the second motor 8 can be conventionally configured by those skilled in the art according to the equipment load and lifting speed requirements. It is a well-known technology in the field and will not be described in detail here.

[0042] The second lead screw 9 is used to convert the rotational motion output by the second motor 8 into linear motion. As the driving component of the lead screw and nut transmission pair, its rotation drives the moving rod 10 to generate axial displacement. The moving rod 10 acts as the moving nut and connecting rod driving beam in the transmission pair. It is used to reciprocate in the horizontal direction under the drive of the second lead screw 9, thereby synchronously pushing or pulling the connecting rod mechanism connected to it and changing the included angle between the connecting rods.

[0043] The first rotating rod 11 and the second rotating rod 12 together form a scissor-type or parallelogram linkage support structure, which is used to convert the horizontal displacement input by the moving rod 10 into vertical lifting displacement, and at the same time, it serves as the main force-bearing component to support the weight of the bed frame 1 and the patient; wherein, the first rotating rod 11 and the second rotating rod 12 form a fulcrum through the rotational connection in the middle to ensure that the two move in coordination.

[0044] The first slider 13 is used to construct a sliding pair. When the second rotating rod 12 pushes the bed support 1 to rise and fall, the end of the second rotating rod 12 is allowed to slide freely in the horizontal direction at the bottom of the bed support 1 to compensate for the horizontal displacement component caused by the angle change and prevent the mechanism from jamming. The second slider 52 is used to guide the lower end of the first rotating rod 11 to slide in an directional manner on the outside of the moving support 7. It cooperates with the first slider 13 to ensure that the entire linkage mechanism maintains the stability of the motion trajectory and the geometric stability of the structure when changing the vertical height.

[0045] Please see the appendix Figure 6 and attached Figure 9 The movable insertion assembly includes a link block 16 and a fixed armature block 38. Both the link block 16 and the fixed armature block 38 are fixedly connected to the top of the bed support 1 on their outer sides. A third motor 17 is fixedly connected to the inner wall of the link block 16. A third lead screw 18 is fixedly connected to the output end of the third motor 17. A limit block 19 is threadedly connected to the outer side of the third lead screw 18. The limit block 19 is slidably connected to the outer side of the link block 16. A limit rod 39 is fixedly connected inside the fixed armature block 38. A connecting block 40 is slidably connected to the outer side of the limit rod 39. The connecting block 40 is fixedly connected to the outer side of the diaphragm box 33.

[0046] Specifically, the link block 16 and the fixed armature block 38 together form the basic support structure of the movable insertion component, which is used to support the drive unit and guide components, establish the mechanical reference for telescopic movement, and prevent the mechanism from displacing or deforming under load.

[0047] The third motor 17 serves as the power source for the linear drive system, used to output controlled rotational torque. As for the specific control method and circuit connection of the third motor 17, those skilled in the art can make conventional configurations according to the thrust and speed requirements, which are well-known technologies in the field and will not be described in detail here.

[0048] The third lead screw 18 is used to construct a lead screw transmission pair, converting the rotational motion output by the third motor 17 into axial linear motion, thereby driving the actuator to extend and retract; the limiting block 19 acts as a moving nut in the transmission pair, used to generate reciprocating displacement along the axial direction under the rotational drive of the third lead screw 18, and as a power output end to drive subsequent components such as the thin shell 20 to move synchronously; at the same time, the sliding fit design between the limiting block 19 and the outer side of the connecting block 16 is used to limit the circumferential rotational freedom of the limiting block 19, ensuring that its motion trajectory strictly extends along the axial direction.

[0049] The limiting rod 39 serves as an auxiliary guide rail, providing support and guidance for the remote or lateral moving parts, preventing the telescopic mechanism from tilting and shaking due to gravity or load in the long-stroke cantilever state; the connecting block 40 is used to construct the sliding pair, which slides directionally on the limiting rod 39, and at the same time serves as a connecting medium to couple the membrane box 33 with the guiding system, ensuring that the membrane box 33 obtains multi-point support during the follow-up process, and ensuring the stability and centering of the sterile membrane 32 conveying structure during horizontal movement.

[0050] Please see the appendix Figure 1 - Appendix Figure 10The conveying mechanism includes a thin shell 20 and a driven shaft 37. The driven shaft 37 is rotatably connected to the inside of the second fixed block 51. The thin shell 20 is fixedly connected to the outside of the limiting block 19. A fourth motor 21 is fixedly connected to the inner wall of the thin shell 20. A drive shaft 35 is fixedly connected to the output end of the fourth motor 21. A first gear 23 is fixedly connected to the outside of the drive shaft 35. A first synchronous pulley 41 is fixedly connected to the outside of the driven shaft 37.

[0051] Specifically, the thin shell 20 serves as the basic support housing for the conveying mechanism, providing a closed installation space and precise positioning reference for the internal motor and transmission shaft system. At the same time, it serves as the carrier of the motion unit, coupling the conveying system with the moving insertion component, ensuring that the entire conveying module can move horizontally back and forth stably with the limit block 19.

[0052] Driven shaft 37 serves as the far-end support shaft of the conveyor belt system. It works in conjunction with drive shaft 35 to tension transmission belt 36, guide transmission belt 36 to rotate smoothly at the end of the device, and also acts as an intermediate node for power transmission, extracting and transmitting the rotational kinetic energy of the conveyor system to subsequent functional components.

[0053] The fourth motor 21 serves as the core power source of the conveying system, used to output controllable rotational torque to drive the load. As for the specific selection of the fourth motor 21, such as the DC geared motor and drive circuit design, those skilled in the art can make conventional configurations according to the requirements of conveying torque and speed control. This is a well-known technology in the field and will not be described in detail here.

[0054] The drive shaft 35 serves as the main drive shaft, directly receiving the power output from the fourth motor 21 and driving the entire conveying interface through friction or meshing with the inner surface of the transmission belt 36, thereby achieving translation of the patient's position; the first gear 23 is used to construct the active input end of the gear transmission pair, diverting and transmitting the rotational motion of the drive shaft 35 to the unwinding mechanism, and achieving rigid linkage between the conveying speed and the film winding speed through mechanical meshing.

[0055] The first synchronous pulley 41 is used to construct the active end of the synchronous belt drive system. By utilizing the rotational motion of the driven shaft 37, power is precisely transmitted to the lifting assembly through the synchronous belt, realizing the timing coordination and power coupling between the conveying action and the mechanical action of the front shovel head.

[0056] Please see the appendix Figure 1 - Appendix Figure 10The membrane box 33 is fixedly connected to the outside of the thin shell 20. The second fixing block 51 is fixedly connected to the outside of the thin shell 20. The first synchronous pulley 41 and the second synchronous pulley 42 are driven by a synchronous belt. The pawl 29 is engaged with the ratchet groove 27. The ratchet groove 27 is rotatably connected to the outside of the membrane box 33. The first gear 23 is engaged with the two second gears 24. A transmission belt 36 is provided between the ratchet groove 27 and the drive shaft 35. The sterile membrane 32 is attached to the transmission belt 36.

[0057] Specifically, the structure of the membrane box 33 and the second fixing block 51 being fixedly connected to the outside of the thin shell 20 is designed to build a highly integrated motion module, ensuring that the sterile membrane 32 take-up and take-down system, the front end tilting mechanism and the conveying drive unit form a unified displacement whole. When the moving insertion component drives the thin shell 20 to extend and retract horizontally, the above subsystems can maintain a constant relative position and move synchronously.

[0058] The first synchronous pulley 41, the second synchronous pulley 42, and the matching synchronous belt together form a precision transmission chain, which is used to transmit the rotational motion of the driven shaft 37 at the end of the conveying system to the lifting component at the front end according to a fixed transmission ratio. This ensures that the reciprocating motion frequency of the shovel head 48 maintains a strict kinematic relationship with the linear velocity of the conveying interface, preventing stacking or jamming caused by asynchronous motion. For the specific tension adjustment and tooth profile selection of the synchronous belt drive, those skilled in the art can refer to the mechanical design manual for setting, which is a well-known technology in the field and will not be described in detail here.

[0059] The meshing structure of the first gear 23 and the two second gears 24 is used to construct a power splitting system, which distributes the single-path rotational power input from the drive shaft 35 simultaneously and in opposite or the same direction, depending on the gear arrangement, to the upper and lower film winding mechanisms, ensuring that the release and retraction of the sterile film 32 are carried out simultaneously; the engagement of the pawl 29 and the ratchet groove 27 is used to construct a one-way clutch or anti-reverse mechanism. During the film winding process, this mechanism allows the winding rod 31 to rotate in the winding direction, while using the mechanical blocking effect of the pawl 29 to prevent the winding rod 31 from reversing and loosening under the action of film tension, thereby maintaining the tension of the sterile film 32 on the transmission path.

[0060] The drive belt 36, as the core conveying medium that bears the patient's weight and generates tangential friction, is tensioned between the drive shaft 35 and the driven shaft 37 to convert the rotational torque of the motor into translational conveying motion. The design of the sterile membrane 32, which is attached to the surface of the drive belt 36, aims to use the high friction coefficient surface of the drive belt 36, such as a silicone layer or a textured layer, to drive the smooth sterile membrane 32 to move synchronously. Thus, without direct contact with the patient's skin and clothing, the driving force of the drive belt 36 is transmitted to the patient through the sterile membrane 32, achieving non-destructive and sterile positional transfer.

[0061] Working principle: The device adjusts the height of the over-bed support 1 to fit the bed through a lifting mechanism. The second motor 8 drives the second lead screw 9 to rotate, causing the moving rod 10 to move along the thread axis. The displacement of the moving rod 10 causes the first rotating rod 11 and the second rotating rod 12 to deflect at an angle. The first slider 13 and the second slider 52 slide at the bottom of the over-bed support 1 and the outside of the moving support 7, respectively, changing the vertical span of the linkage mechanism and realizing the overall lifting of the over-bed support 1.

[0062] The moving insertion component performs a horizontal telescopic movement. The third motor 17 drives the third lead screw 18 to rotate, and the limiting block 19 slides along the connecting block 16 under the threaded drive. The limiting block 19 causes the thin shell 20, diaphragm box 33, and fixed armature block 38 to extend outward. During this horizontal displacement, the lower body component 14 and the upper body component 15 move accordingly. At this time, the sliding block at the bottom of the upper body component 15 slides in the sliding groove opened in the moving plate 2, and the moving plate 2 provides support, guidance, and limiting for the upper body component 15.

[0063] When back elevation adjustment is required for critically ill patients, the lower body assembly 14 remains stationary. The first motor 6 drives the first lead screw 5 to rotate, causing the first fixed block 4 to move axially. The first fixed block 4 pushes the moving plate 2 to undergo displacement and angular deflection via the adjusting rod 3. The moving plate 2 pushes the upper body assembly 15 upward, and the sliding block at the bottom of the upper body assembly 15 is always constrained within the sliding groove of the moving plate 2, thereby ensuring a stable motion trajectory. Under the thrust of the moving plate 2, the upper body assembly 15 rotates around its connection node with the lower body assembly 14, achieving an elevation of the upper body angle.

[0064] The delivery assembly and unwinding mechanism work together to move the patient and refresh the contact surface. A fourth motor 21 drives the drive shaft 35 to rotate, which in turn drives the first gear 23. The first gear 23 meshes with two second gears 24, which in turn drive the circular block 28 to rotate via a connecting shaft 25. A pawl 29 on the circular block 28 engages with a ratchet slot 27 within the rotating disk 26, driving the winding rod 31 to rotate unidirectionally. The rotation of the winding rod 31 causes the sterile membrane 32 to unwind and rewind, coordinating with the movement of the transmission belt 36 to ensure the sterile membrane 32 moves synchronously against the surface of the transmission belt 36, thus achieving patient relocation and sterile membrane renewal.

[0065] During transport, the drive shaft 35 drives the transmission belt 36 and the driven shaft 37 to rotate, and the driven shaft 37 drives the first synchronous pulley 41 to rotate. The first synchronous pulley 41 drives the second synchronous pulley 42 through the synchronous belt, causing the actuating lever 44 to rotate within the second fixed block 51. The multiple protrusions 45 on the outer side of the actuating lever 44 rotate accordingly and periodically abut against the abutting block 46 inside the shovel head 48. The thrust of the protrusions 45 forces the shovel head 48 to deflect and tilt around the reciprocating axis 49, and the spring 34 provides a reverse restoring force, thereby causing the shovel head 48 to reciprocate to assist in cutting into or lifting one side of the patient's body.

Claims

1. A non-invasive bed transfer device for positioning critically ill patients, comprising a bed transfer support (1), characterized in that, The bottom of the bed support (1) is provided with a lifting mechanism. The inner wall of the bed support (1) is provided with a lower body assembly (14). The outer side of the lower body assembly (14) is rotatably connected to an upper body assembly (15). The outer sides of both the lower body assembly (14) and the upper body assembly (15) are provided with a moving insertion assembly, a tilting assembly, an unwinding mechanism, and a conveying assembly. The unwinding mechanism includes two second gears (24) and a film box (33). A connecting shaft (25) is fixedly connected to the outside of the second gear (24). A round block (28) is fixedly connected to the outside of the connecting shaft (25). A ratchet (29) is rotatably connected to the outside of the round block (28). A winding rod (31) is rotatably connected inside the film box (33). A sterile film (32) is provided on the outside of the winding rod (31). One end of the sterile film (32) is fixedly connected to the outside of the upper winding rod (31), and the other end of the sterile film (32) is fixedly connected to the outside of the lower winding rod (31). A rotating disk (26) is fixedly connected to the outside of the winding rod (31). A ratchet groove (27) is provided inside the rotating disk (26). A first spring (30) is fixedly connected to the inner wall of the ratchet groove (27) and the outside of the round block (28).

2. The non-destructive bed-transfer device for positioning critically ill patients according to claim 1, characterized in that, The tilting assembly includes a second fixing block (51), a protective cover (43) fixedly connected to the outside of the second fixing block (51), a lever (44) rotatably connected inside the second fixing block (51), a second synchronous wheel (42) fixedly connected to the outside of the lever (44), a plurality of protrusions (45) fixedly connected to the outside of the lever (44), an outer cover (50) fixedly connected to the inner wall of the protective cover (43), and a reciprocating shaft (49) rotatably connected inside the outer cover (50). A spring (34) is sleeved on the outside of the reciprocating shaft (49). One end of the spring (34) is fixedly connected to the inner wall of the outer cover (50), and the other end of the spring (34) is fixedly connected to the outside of the reciprocating shaft (49). A shovel head (48) is fixedly connected to the outside of the reciprocating shaft (49). A lever (44) is provided inside the shovel head (48). An abutment block (46) is fixedly connected to the upper side of the inner wall of the lever (44). The protrusion (45) abuts against the abutment block (46).

3. The non-destructive bed transfer device for positioning critically ill patients according to claim 1, characterized in that, The adjustment assembly includes a movable plate (2) and a first motor (6). The movable plate (2) is located on the outside of the lower part of the upper body assembly (15). The first motor (6) is fixedly connected to the outside of the bed support (1). The movable plate (2) has a sliding groove inside. The output end of the first motor (6) is fixedly connected to a first lead screw (5). The outside of the first lead screw (5) is fixedly connected to a first fixing block (4). An adjustment rod (3) is rotatably connected between the outside of the first fixing block (4) and the bottom of the movable plate (2).

4. The non-destructive bed-transfer device for positioning critically ill patients according to claim 1, characterized in that, The lifting assembly includes a movable bracket (7), the top of which is fixedly connected to the bottom of the bed-crossing bracket (1). A second motor (8) is fixedly connected to the outside of the movable bracket (7). A second lead screw (9) is fixedly connected to the output end of the second motor (8). A movable rod (10) is threadedly connected to the outside of the second lead screw (9). A first rotating rod (11) is rotatably connected to both ends of the movable rod (10). A second rotating rod (12) is rotatably connected to the outside of the first rotating rod (11). One end of the second rotating rod (12) is rotatably connected to the outside of the movable bracket (7). The other end of the second rotating rod (12) is rotatably connected to a first slider (13). The outside of the first slider (13) is slidably connected to the bottom of the bed-crossing bracket (1). One end of the first rotating rod (11) is rotatably connected to the top of the bed-crossing bracket (1). The other end of the first rotating rod (11) is rotatably connected to a second slider (52). The outside of the second slider (52) is slidably connected to the outside of the movable bracket (7).

5. The non-destructive bed-transfer device for positioning critically ill patients according to claim 2, characterized in that, The movable insertion assembly includes a link block (16) and a fixed armature block (38). The outer sides of the link block (16) and the fixed armature block (38) are fixedly connected to the top of the bed support (1). A third motor (17) is fixedly connected to the inner wall of the link block (16). A third lead screw (18) is fixedly connected to the output end of the third motor (17). A limit block (19) is threadedly connected to the outer side of the third lead screw (18). The limit block (19) is slidably connected to the outer side of the link block (16). A limit rod (39) is fixedly connected inside the fixed armature block (38). A connecting block (40) is slidably connected to the outer side of the limit rod (39). The connecting block (40) is fixedly connected to the outer side of the diaphragm box (33).

6. The non-destructive bed-transfer device for positioning critically ill patients according to claim 5, characterized in that, The conveying mechanism includes a thin shell (20) and a driven shaft (37). The driven shaft (37) is rotatably connected to the inside of the second fixed block (51) on the outside. The thin shell (20) is fixedly connected to the outside of the limiting block (19). A fourth motor (21) is fixedly connected to the inner wall of the thin shell (20). A drive shaft (35) is fixedly connected to the output end of the fourth motor (21). A first gear (23) is fixedly connected to the outside of the drive shaft (35). A first synchronous pulley (41) is fixedly connected to the outside of the driven shaft (37).

7. A non-destructive bed-transfer device for positioning critically ill patients according to claim 6, characterized in that, The outer side of the membrane box (33) is fixedly connected to the outer side of the thin shell (20), and the outer side of the second fixing block (51) is fixedly connected to the outer side of the thin shell (20).

8. A non-destructive bed transfer device for positioning critically ill patients according to claim 6, characterized in that, The first synchronous pulley (41) and the second synchronous pulley (42) are driven by synchronous belt meshing.

9. A non-destructive bed transfer device for positioning critically ill patients according to claim 6, characterized in that, The pawl (29) engages with the ratchet groove (27), the ratchet groove (27) is rotatably connected to the outside of the diaphragm box (33), and the first gear (23) meshes with the two second gears (24).

10. A non-destructive bed-transfer device for positioning critically ill patients according to claim 6, characterized in that, A transmission belt (36) is provided between the ratchet groove (27) and the drive shaft (35), and the sterile membrane (32) is attached to the transmission belt (36).

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