A deformable stretcher

Abstract

The present invention relates to a stretcher for transporting the wounded, and in particular to a deformable stretcher. The stretcher comprises an upper stretcher section, a middle stretcher section, a lower stretcher section and a rotation drive mechanism, wherein the upper stretcher section, the middle stretcher section and the lower stretcher section are rotationally connected in sequence; the upper section rotation axis of the upper stretcher section is located on the axis of the wounded's hip joint; the rotation drive mechanism is arranged on the middle stretcher section and connected to the upper stretcher section and the lower stretcher section, and the rotation drive mechanism is used to drive the upper stretcher section and the lower stretcher section to rotate relative to the middle stretcher section. The present invention can achieve that when the stretcher is deformed, the torso, head and thigh of the spinal patient are always effectively fastened, thereby avoiding secondary injuries to the spinal patient during transportation.

Description

Technical Field

[0001] The invention relates to a stretcher for transporting wounded persons, in particular to a deformable stretcher. Background Art

[0002] Existing deformable stretchers are usually folded into a chair form through various mechanisms, and the injured are simply fixed on the stretcher with straps. Designers pursue convenience and lightness in use. In this conventional stretcher deformation method, the rotation axis during deformation is located on the stretcher body. The rotation axis of the stretcher is not coaxial with the human hip joint, and the stretcher body and the human hip axis are generally about 10 cm away. When the stretcher is deformed, there will be a misalignment between the human body and the stretcher. For lightly injured people or patients with physical disabilities, the impact of this misalignment can be eliminated by self-adjustment of the body, but seriously injured people with spinal injuries cannot adjust themselves. At the same time, this misalignment will cause the fastening straps and the fastening parts of the seriously injured to jump out of position, so the injured cannot always keep the stretcher fastened when the stretcher is deformed. It is not suitable for spinal injuries that need to be fastened.

[0003] In the post-disaster building environment, the wounded are transported on traditional stretchers, and the space for stretchers to be used is greatly limited. However, for spinal patients, the bending of the hip joint and the movement below the knee joint will not cause secondary injuries. How to reduce the space for use of the stretcher by deforming it, and how to keep the spinal patients tight while the stretcher deforms, are technical problems that we need to solve. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a deformable stretcher, which can effectively fasten the torso, head and thighs of the spinal patient at all times while the stretcher is deformed, thereby avoiding secondary injury to the spinal patient during transportation.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A deformable stretcher comprises an upper stretcher section, a middle stretcher section, a lower stretcher section and a rotation drive mechanism, wherein the upper stretcher section, the middle stretcher section and the lower stretcher section are rotationally connected in sequence;

[0007] The upper rotation axis of the upper section of the stretcher is located on the axis of the injured person's hip joint;

[0008] The rotary drive mechanism is arranged on the middle section of the stretcher and connected with the upper section of the stretcher and the lower section of the stretcher. The rotary drive mechanism is used to drive the upper section of the stretcher and the lower section of the stretcher to rotate relative to the middle section of the stretcher.

[0009] The middle section of the stretcher is provided with an arc-shaped slide rail with the rotation axis of the upper section as the central axis, and the upper section of the stretcher is slidably connected to the arc-shaped slide rail.

[0010] The arc-shaped slide rail comprises two rows of cylindrical needle roller bearings arranged in parallel, and the cylindrical needle roller bearings are connected to the middle section of the stretcher via a needle roller bearing rotating shaft;

[0011] The upper section of the stretcher is connected with a bearing bush with an arc structure. The bearing bush is arranged between two rows of cylindrical needle roller bearings and can slide between the two rows of cylindrical needle roller bearings.

[0012] The rotary drive mechanism comprises a motor reducer assembly, a rocker mechanism and a gear transmission mechanism, wherein the motor reducer assembly is arranged on the middle section of the stretcher, and the output end is connected to the upper section of the stretcher through the rocker mechanism;

[0013] The output shaft of the motor reducer assembly is connected to the lower section of the stretcher through a gear transmission mechanism.

[0014] The rocker mechanism includes a driving rocker and a push rod, wherein one end of the driving rocker is fixedly connected to the output end of the motor reducer assembly, and the other end is hinged to one end of the push rod, and the other end of the push rod is hinged to a push shaft provided on the upper section of the stretcher.

[0015] The gear transmission mechanism includes a driving gear, a driven pinion, a driven large gear, a large gear shaft and a fixing flange, wherein the driving gear is arranged on the output shaft of the motor reducer assembly, the large gear shaft is rotatably arranged on the middle section of the stretcher, the driven large gear and the fixing flange are fixed on the large gear shaft; the driven pinion is rotatably arranged on the middle section of the stretcher and meshes with the driving gear and the driven large gear; the fixing flange is connected to the lower section of the stretcher.

[0016] The gear transmission mechanism drives the upper stretcher section and the lower stretcher section to rotate in the same direction.

[0017] The gear transmission mechanism drives the upper section and the lower section of the stretcher to rotate at an angle of α±2°.

[0018] The vertical distance between the upper section rotation axis and the upper surface of the deformable stretcher is 9-14 cm.

[0019] The upper section, the middle section and the lower section of the stretcher are all provided with straps for binding the wounded.

[0020] The present invention has the following beneficial effects and advantages:

[0021] 1. The present invention designs the rotation axis of the deformable stretcher as a virtual axis, so as to facilitate keeping it coaxial with the hip joint axis of the human body, effectively preventing the torso, head and thigh of the injured person from jumping out of position with the human body when the stretcher is deformed, and facilitating the fastening of the seriously injured such as those with spinal injuries on the deformable stretcher. The invention is suitable for terrain environments with harsh length restrictions such as stairs and turns inside buildings.

[0022] 2. The rotation axis of the stretcher of the present invention is designed as a virtual axis, so as to avoid the fixed end of the axis protruding from the upper surface of the stretcher after being designed as a real axis, and to avoid the real axis becoming a "protruding" obstacle when delivering the wounded. It can effectively facilitate the transfer of the wounded from the longitudinally spliced ​​stretcher and also avoid accidental squeezing or cutting of medical staff.

[0023] 3. The present invention is driven by a single-degree-of-freedom motor and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the deformable stretcher of the present invention in the shape of a letter "I";

[0025] Figure 2 It is a schematic diagram of the structure of the deformable stretcher of the present invention in a "Z" shape;

[0026] Figure 3 It is a schematic diagram of the design position of the virtual axis of rotation between the upper section and the middle section of the stretcher in the present invention;

[0027] Figure 4 It is a specific installation and transmission schematic diagram of the deformable stretcher of the present invention;

[0028] Figure 5 It is a schematic diagram of the installation of the rotating shaft between the lower section and the middle section of the stretcher in the present invention.

[0029] In the figure: 1 is the upper section of the stretcher, 2 is the middle section of the stretcher, 3 is the lower section of the stretcher, 4 is the upper section rotation axis, 5 is the strap, 6 is the bearing, 7 is the needle roller bearing rotation axis, 8 is the cylindrical needle roller bearing, 9 is the motor reducer assembly, 10 is the driving rocker, 11 is the push rod, 12 is the push shaft, 13 is the driving gear, 14 is the driven small gear, 15 is the driven large gear, 16 is the large gear shaft, and 17 is the fixing flange. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1-2As shown, a deformable stretcher provided by the present invention comprises an upper stretcher section 1, a middle stretcher section 2, a lower stretcher section 3 and a rotation drive mechanism, wherein the upper stretcher section 1, the middle stretcher section 2 and the lower stretcher section 3 are rotationally connected in sequence; an upper section rotation axis 4 of the upper stretcher section 1 is located on the axis of the hip joint of the injured person lying on the deformable stretcher; the rotation drive mechanism is arranged on the middle stretcher section 2 and is connected to the upper stretcher section 1 and the lower stretcher section 3, and the rotation drive mechanism is used to drive the upper stretcher section 1 and the lower stretcher section 3 to rotate relative to the middle stretcher section 2.

[0032] Furthermore, the upper stretcher section 1 , the middle stretcher section 2 and the lower stretcher section 3 are all provided with strap fixing seats, and the strap fixing seats are provided with straps 5 for binding the wounded, and the wounded is fixed on the stretcher by the straps 5 .

[0033] like Figure 3 As shown, in the embodiment of the present invention, an arc-shaped slide rail with the upper section rotation axis 4 as the central axis is provided on the middle section 2 of the stretcher, and the upper section 1 of the stretcher is slidably connected to the arc-shaped slide rail.

[0034] Specifically, the arc-shaped slide rail includes two rows of cylindrical needle bearings 8 arranged in parallel, and the cylindrical needle bearings 8 are connected to the middle section 2 of the stretcher through the needle bearing rotating shaft 7; the upper section 1 of the stretcher is connected with a bearing bush 6 of an arc structure, and the arc structure of the bearing bush 6 is adapted to the arc-shaped slide rail. The bearing bush 6 is arranged between the two rows of cylindrical needle bearings 8 and can slide between the two rows of cylindrical needle bearings 8.

[0035] like Figure 4 As shown, in an embodiment of the present invention, the rotary drive mechanism includes a motor reducer assembly 9, a rocker mechanism and a gear transmission mechanism, wherein the motor reducer assembly 9 is arranged on the middle section 2 of the stretcher, and the output end is connected to the upper section 1 of the stretcher through the rocker mechanism; the output shaft of the motor reducer assembly 9 is connected to the lower section 3 of the stretcher through the gear transmission mechanism.

[0036] In the embodiment of the present invention, the rocker mechanism includes a driving rocker 10 and a push rod 11, wherein one end of the driving rocker 10 is fixedly connected to the output end of the motor reducer assembly 9, and the other end is hinged to one end of the push rod 11, and the other end of the push rod 11 is hinged to a push shaft 12 provided on the upper section 1 of the stretcher. The motor reducer assembly 9 rotates, thereby driving the driving rocker 10 to swing, and the driving rocker 10 pushes the upper section 1 of the stretcher to rotate through the push rod 11. The bearing bush 6 on the upper section 1 of the stretcher is guided by two rows of cylindrical needle bearings 8, so that the upper section 1 of the stretcher rotates around the upper section rotation axis 4, and the folding action between the upper section 1 of the stretcher and the middle section 2 of the stretcher is realized. In this embodiment, because the motor is close to the human body, a 36V DC motor is selected.

[0037] Preferably, the vertical distance between the upper rotating axis 4 and the upper surface of the deformable stretcher is 9-14 cm.

[0038] Furthermore, the gear transmission mechanism drives the upper stretcher section 1 and the lower stretcher section 3 to rotate in the same direction, and the gear transmission mechanism drives the upper stretcher section 1 and the lower stretcher section 3 to rotate at substantially the same angle, which is α±2°.

[0039] like Figure 4-5 As shown, in the embodiment of the present invention, the gear transmission mechanism includes a driving gear 13, a driven pinion 14, a driven large gear 15, a large gear shaft 16 and a fixing flange 17, wherein the driving gear 13 is arranged on the output shaft of the motor reducer assembly 9, the large gear shaft 16 is rotatably arranged on the middle section 2 of the stretcher, the driven large gear 15 and the fixing flange 17 are fixed on the large gear shaft 16; the driven pinion 14 is rotatably arranged on the middle section 2 of the stretcher, and meshes with the driving gear 13 and the driven large gear 15; the fixing flange 17 is connected to the lower section 3 of the stretcher. The motor reducer assembly 9 drives the driving gear 13 to rotate, the driving gear 13 drives the driven large gear 15 to rotate through the driven pinion 14, thereby driving the large gear shaft 16 to rotate, and the large gear shaft 16 drives the lower section 3 of the stretcher to rotate through the fixing flange 17, thereby realizing the folding action between the lower section 3 of the stretcher and the middle section 2 of the stretcher.

[0040] In the embodiment of the present invention, a driven pinion 14 is provided between the driving pinion 13 and the driven gear 15 to ensure that the folding rotation direction of the lower stretcher section 3 and the upper stretcher section 1 is the same. By setting the transmission ratio between the driven gear 15 and the driving pinion 13, the folding angle between the lower stretcher section 3 and the middle stretcher section 2 and the folding angle between the upper stretcher section 1 and the middle stretcher section 2 are substantially the same, both of which are α±2°.

[0041] In the embodiment of the present invention, the folding axis of the stretcher at the buttocks (upper rotation axis 4) is consistent with the axis of the hip joint of the human body, ensuring that the straps fixing the torso and thigh of the injured person do not misalign with the human body when the stretcher is folded and deformed. Since the spinal injury patients do not have high requirements for the fixation of the calves, the problem of the folding part of the stretcher and the knee joint axis being consistent is not considered.

[0042] like Figure 3 As shown, the hip folding part of the stretcher is designed, and the upper section rotation axis 4 is determined by the bearing bush 6 fixedly connected to the upper section 1 of the stretcher and the arc-shaped slide rail fixedly connected to the middle section 2 of the stretcher, and the arc-shaped slide rail is composed of two upper and lower rows of cylindrical needle bearings 8. The curvature of the bearing bush 6 and the fixed position of the cylindrical needle bearing 8 jointly determine the position of the upper section rotation axis 4. The cylindrical needle bearing 8 plays the role of guiding the bearing bush 6 and reducing friction when rotating.

[0043] The present invention provides a deformable stretcher suitable for fastening spinal patients, which can keep the rotation axis of the stretcher coaxial with the human hip joint. At the same time, the rotation axis is used as a "virtual axis" and is not actually installed above the stretcher, which is convenient for delivering the wounded with a longitudinally spliced ​​stretcher, and avoids the situation where the rotation axis is designed as a real axis and protrudes from the upper surface of the stretcher, which is not conducive to the delivery of the wounded.

[0044] The present invention designs the rotation axis of the deformable stretcher as a virtual axis, so as to facilitate keeping it coaxial with the hip joint axis of the human body, effectively preventing the torso, head and thigh of the injured person from jumping out of the stretcher when the stretcher is deformed, and facilitating the fastening of seriously injured patients such as spinal injuries on the deformable stretcher. The present invention is suitable for terrain environments with relatively harsh length restrictions such as stairs and turns inside buildings.

[0045] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A deformable stretcher, characterized in that: The stretcher comprises an upper stretcher section (1), a middle stretcher section (2), a lower stretcher section (3) and a rotation drive mechanism, wherein the upper stretcher section (1), the middle stretcher section (2) and the lower stretcher section (3) are rotationally connected in sequence; The upper rotation axis (4) of the stretcher upper section (1) is located on the axis of the injured person's hip joint; The rotary drive mechanism is arranged on the stretcher middle section (2) and is connected to the stretcher upper section (1) and the stretcher lower section (3), and the rotary drive mechanism is used to drive the stretcher upper section (1) and the stretcher lower section (3) to rotate relative to the stretcher middle section (2); The middle section (2) of the stretcher is provided with an arc-shaped slide rail with the upper section rotation axis (4) as the central axis, and the upper section (1) of the stretcher is slidably connected to the arc-shaped slide rail; The arc-shaped slide rail comprises two rows of cylindrical needle bearings (8) arranged in parallel, and the cylindrical needle bearings (8) are connected to the stretcher middle section (2) via a needle bearing rotating shaft (7); The upper section (1) of the stretcher is connected to a bearing bush (6) with an arc structure, and the bearing bush (6) is arranged between two rows of cylindrical needle roller bearings (8) and can slide between the two rows of cylindrical needle roller bearings (8); The rotary drive mechanism comprises a motor reducer assembly (9), a rocker mechanism and a gear transmission mechanism, wherein the motor reducer assembly (9) is arranged on the middle section (2) of the stretcher, and the output end is connected to the upper section (1) of the stretcher through the rocker mechanism; the output shaft of the motor reducer assembly (9) is connected to the lower section (3) of the stretcher through the gear transmission mechanism; The rocker mechanism comprises a driving rocker (10) and a push rod (11), wherein one end of the driving rocker (10) is fixedly connected to the output end of the motor reducer assembly (9), and the other end is hinged to one end of the push rod (11), and the other end of the push rod (11) is hinged to a push shaft (12) provided on the upper section (1) of the stretcher; the motor reducer assembly (9) rotates, thereby driving the driving rocker (10) to swing, and the driving rocker (10) pushes the upper section (1) of the stretcher to rotate through the push rod (11); the bearing (6) on the upper section (1) of the stretcher is guided by two rows of cylindrical needle bearings (8), so that the upper section (1) of the stretcher rotates around the upper section rotation axis (4), thereby realizing the folding action between the upper section (1) of the stretcher and the middle section (2) of the stretcher; The gear transmission mechanism includes a driving gear (13), a driven small gear (14), a driven large gear (15), a large gear shaft (16) and a fixing flange (17), wherein the driving gear (13) is arranged on the output shaft of the motor reducer assembly (9), the large gear shaft (16) is rotatably arranged on the middle section (2) of the stretcher, the driven large gear (15) and the fixing flange (17) are fixed on the large gear shaft (16); the driven small gear (14) is rotatably arranged on the middle section (2) of the stretcher The fixed flange (17) is connected to the lower section (3) of the stretcher; the motor reducer assembly (9) drives the driving gear (13) to rotate, and the driving gear (13) drives the driven large gear (15) to rotate through the driven small gear (14), thereby driving the large gear shaft (16) to rotate, and the large gear shaft (16) drives the lower section (3) of the stretcher to rotate through the fixed flange (17), thereby realizing the folding action between the lower section (3) of the stretcher and the middle section (2) of the stretcher.

2. The deformable stretcher according to claim 1, characterized in that: The gear transmission mechanism drives the upper stretcher section (1) and the lower stretcher section (3) to rotate in the same direction.

3. The deformable stretcher according to claim 2, characterized in that: The gear transmission mechanism drives the upper stretcher section (1) and the lower stretcher section (3) to rotate at an angle of α±2°.

4. The deformable stretcher according to claim 1, characterized in that: The vertical distance between the upper section rotation axis (4) and the upper surface of the deformable stretcher is 9-14 cm.

5. The deformable stretcher according to claim 1, characterized in that: The upper stretcher section (1), the middle stretcher section (2) and the lower stretcher section (3) are all provided with straps (5) for tying up the wounded.

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