Portable folding stretcher

Abstract

The invention relates to a portable folding stretcher which comprises two groups of symmetrical telescopic stretcher rods which are composed of a plurality of sections of sleeved telescopic rods and comprise first telescopic rods and sleeved second telescopic rods. The middle folding joint is connected with two first telescopic rods, supporting assemblies are arranged on the rods, and bearing cloth is fixed between the two rods. A pin shaft assembly (comprising a fixing piece, a bayonet lock and a spring) is arranged between the first telescopic rod and the second telescopic rod, and the bayonet lock is popped into a positioning hole when the first telescopic rod and the second telescopic rod are stretched in place to realize circumferential and axial locking. The folding joint is composed of two hinged joint seats, and the upper semicircular structures of the two hinged joint seats are spliced into an infusion rod insertion hole. The stretcher has the advantages that on the basis of ensuring the transfer safety, the applicability, the function completeness and the emergency deployment efficiency of the stretcher in a complex rescue scene are improved, and the comprehensive requirements of modern first aid for the stability, the multifunctionality and the environmental adaptability of stretcher equipment are practically met.

Description

Technical Field

[0001] This invention relates to the field of medical emergency stretchers and medical rescue equipment, and in particular to a portable folding stretcher that is small in size, lightweight, easy to unfold and fold, and integrates an IV pole insertion hole. Background Technology

[0002] In routine medical care, and especially in emergency situations such as disaster relief and battlefield operations, stretchers are the core equipment for transporting the wounded, and their performance directly affects rescue efficiency and patient safety. Therefore, stretchers need to ensure structural strength while also being portable, easy to operate, and fully functional to adapt to complex and ever-changing rescue environments.

[0003] However, traditional standard stretchers are around 2200mm long and are mostly made of wood or metal, which, while inexpensive, are quite heavy. Therefore, traditional stretchers are very inconvenient to carry in disaster relief, battlefield, and other field scenarios. While existing folding stretchers are designed for portability, they have several significant drawbacks in practical applications, hindering the effective implementation of rescue operations.

[0004] First, existing four-fold stretchers, when folded, form eight short tubes. While this significantly shortens the carrying length, the standard 2200mm stretcher still has a folded length of approximately 550mm. Furthermore, the volume formed by the eight short tubes side-by-side after folding is still relatively large, occupying valuable space for transporting rescue equipment. Some four-fold stretchers also have directional folding joints, requiring twisting angles during unfolding and folding, making them difficult to unfold quickly in emergencies.

[0005] Secondly, there is also a structure that uses four carbon fiber round tubes to make telescopic stretcher poles, which can form four short tubes after being stored, significantly reducing the volume compared to the eight short tubes of a four-fold stretcher. However, because the telescopic stretcher tubes are round, after the support rod installed at the far end of the second tube is opened, the first and second round tubes are prone to circumferential rotation. It is difficult to ensure that the folding joint at the end of the first round tube remains in the direction of force. This not only affects the load-bearing capacity of the stretcher, but also causes the folding joint to be subjected to loads in a direction other than the design direction, leading to damage. Although using non-circular carbon fiber tubes such as rectangular tubes can solve the problem of telescopic tube rotation, its process is complex, production efficiency is low, and cost is high, which affects the widespread use of four-telescopic folding stretchers. A French patent has a four-telescopic carbon fiber folding stretcher, in which only one support rod is inserted into the folding joint between the two stretcher poles to open the stretcher when unfolded. Although this non-standard structural design can solve the problem of round tube rotation and ensure that the folding joint maintains the force angle, the stretcher with only one support rod results in insufficient tension of the load-bearing fabric, resulting in poor patient comfort. In addition, although this stretcher is relatively portable, its non-standard design, which lacks support legs and optional accessories, means that the injured person is placed directly on the ground, which is not suitable for some situations and limits the stretcher's applicability.

[0006] What's particularly troublesome is that neither traditional stretchers nor existing folding stretchers have a single-function joint design and fail to integrate an IV pole insertion and fixation structure. When it is necessary to maintain IV infusion during the transfer of the wounded and sick, medical staff can only carry the IV stand or run while holding the IV bag up with their arms.

[0007] These problems collectively lead to the poor performance of existing folding stretchers in actual rescue work. There is an urgent need for a new type of folding stretcher design that is structurally optimized, functionally integrated, lightweight, and easy to operate, in order to improve the efficiency and safety of medical rescue and meet the high standards of modern emergency medicine for stretcher equipment. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a portable folding stretcher to solve the defects of the prior art, such as insufficient structural stability due to the single limiting of the telescopic rod, lack of infusion rod fixing function of the folding joint, non-adjustable support height, excessive overall weight, large storage volume and cumbersome operation steps. In order to improve the applicability, functional completeness and emergency deployment efficiency of the stretcher in complex rescue scenarios while ensuring the safety of transportation, and effectively meet the comprehensive requirements of modern emergency rescue for stretcher equipment in terms of stability, multifunctionality and environmental adaptability.

[0009] To achieve the above objectives, a portable folding stretcher is designed, comprising: two sets of telescopic stretcher poles symmetrically arranged laterally, each set consisting of multiple telescopic rods sequentially sleeved along its length; each telescopic rod includes at least two first telescopic rods arranged longitudinally, and at least two second telescopic rods respectively sleeved with the first telescopic rods; a folding joint located in the middle of the telescopic stretcher poles, with its two ends respectively connected to connecting ends provided on the two first telescopic rods; a support assembly disposed on the telescopic stretcher poles; a support cloth laid between the two sets of telescopic stretcher poles and fixedly connected to the pole body; and a space between the first telescopic rods and the second telescopic rods. The system includes a pin assembly comprising a fixing member, a locking pin housed therein, and a spring. The fixing member is fixed to the end of the second telescopic rod near the first telescopic rod. When the first and second telescopic rods are extended to their maximum limits, the locking pin is ejected by the spring and engages in a positioning hole located at the end of the first telescopic rod furthest from the connecting end, thereby locking the second telescopic rod circumferentially and axially relative to the first telescopic rod. The folding joint includes two folding joint seats hinged together by a connecting piece. Each folding joint seat has a semi-circular structure on its upper part. When the stretcher is unfolded, the two semi-circular structures are joined together to form a circular insertion hole for inserting an IV pole.

[0010] Furthermore, the present invention also includes: the telescopic stretcher rod is composed of a first telescopic rod, a second telescopic rod, a third telescopic rod, and a fourth telescopic rod connected sequentially along its length; the inner walls of the first telescopic rod near the second telescopic rod, the second telescopic rod near the third telescopic rod, and the third telescopic rod near the fourth telescopic rod are all provided with inner wall limiting structures to prevent the second, third, and fourth telescopic rods from sliding out axially; the proximal outer walls of the first, second, and third telescopic rods are all provided with outer wall limiting structures, which, together with the inner wall limiting structures, achieve bidirectional limiting of the telescopic rods.

[0011] Furthermore, the present invention also includes: the inner wall limiting structure of the first telescopic rod, the second telescopic rod, and the third telescopic rod is an integrally formed annular protrusion or a detachable positioning sleeve; the outer wall limiting structure of the first telescopic rod, the second telescopic rod, and the third telescopic rod is an integrally formed annular protrusion or a detachable positioning sleeve; the outer contours of the inner wall limiting structure and the outer wall limiting structure are conformally matched with the inner wall and outer wall of the corresponding telescopic rod to ensure limiting strength.

[0012] Furthermore, the present invention also includes: one side of the upper part of the folding joint seat has a protruding structure and the other side has a recessed structure, with two adjacent folding joint seats facing each other, and the end face of the protruding structure abuts against the end face of the recessed structure of the opposing folding joint seat when the first telescopic rod is unfolded; the semi-circular structure of the semi-circular groove provided on the transverse inner side of the folding joint seat protruding structure conforms to the outer contour of the infusion rod; the upper part of the folding joint seat also has a transverse through hole, and the insertion end of the infusion rod has a corresponding mating hole, with a locking pin passing through both opposing folding joint seats. The folding joint is simultaneously locked in rotation and fixed to the infusion rod within the through hole of the joint seat and the mating hole of the infusion rod. The lower part of the folding joint seat is provided with several spaced fixing plates and several connecting plates arranged in parallel. The two ends of the connecting plates are respectively set in the interval between two adjacent folding joint seat fixing plates. The pin passes through the end of the connecting plate and the end of the fixing plate laterally, forming a structure in which two adjacent first telescopic rods are hinged to the connecting plates through the folding joint seat. The folding joint is formed by metal die casting or by injection molding of carbon fiber composite material or nylon with glass fiber.

[0013] Furthermore, the present invention also includes: a flexible buffer is fixed to the end of the fourth telescopic rod away from the third telescopic rod, the flexible buffer being made of elastic material to alleviate the hard impact when the stretcher is accidentally dropped and to prevent damage to the rod.

[0014] Furthermore, the present invention also includes: the first telescopic rod, the second telescopic rod, the third telescopic rod, and the fourth telescopic rod of the telescopic stretcher are all hollow round tubes made of carbon fiber composite material, so as to achieve a lightweight design of the stretcher while ensuring the strength and rigidity of the rod structure.

[0015] Furthermore, the present invention also includes: the support assembly includes a support base, on which a lifting assembly is detachably connected; the lifting assembly includes a connector and a flip-up leg, one end of the connector is fixedly connected to the support base and the other end is hinged to the flip-up leg, forming a flip-up leg that can be flipped and stored or unfolded relative to the support base; the flip-up leg is provided with four, two of which are convex structures and the other two are concave structures, and the four flip-up legs are diagonally distributed on the support bases on both sides of the stretcher. When stored, the convex and concave structures interlock with each other, reducing the storage volume of the lifting assembly.

[0016] Furthermore, the present invention also includes: the support assembly includes a support base, and the inner side of the support base and the inner side of the telescopic stretcher rod are provided with a plurality of connecting protrusions. The connecting protrusion includes two adjacent ear plates, and each ear plate of the connecting protrusion has a pin hole opened radially. The two sides of the bearing cloth are fixedly connected with a plurality of connecting straps, the ends of the connecting straps are located between the ear plates of the connecting protrusions, and the pins are inserted into the pin holes and detachably connected to the ear plates of the connecting protrusions at both ends. The pins also pass through the sleeves of the ends of the connecting straps and fix the connecting straps to the connecting protrusions, thereby realizing the detachable and fixed connection between the bearing cloth and the telescopic stretcher rod.

[0017] Furthermore, the present invention also includes: safety belt assemblies symmetrically arranged on both sides of the supporting fabric, the safety belt assembly including straps and cooperating buckles, the straps can wrap around the patient and the buckles can be quickly fixed and unlocked.

[0018] Furthermore, the present invention also includes: the support assembly comprising: at least two support seats symmetrically arranged on the telescopic stretcher rods on both sides of the lateral direction; at least two support rods symmetrically arranged on the telescopic stretcher rods on both sides of the lateral direction, with their ends hinged to the support seats; at least one hinge structure disposed between the two support rods in the lateral direction, with its two ends hinged to the ends of the two support rods respectively; the support seats are disposed on the second telescopic rod; the support assembly is symmetrically arranged in two sets along the folding joint to realize lateral support and storage of the telescopic stretcher rods.

[0019] Compared with the prior art, the advantages of this invention are: This folding stretcher demonstrates significant technical advantages in practical applications. In terms of structural stability, all connecting parts reliably lock when fully extended, effectively eliminating axial movement and circumferential rotation of the telescopic rod during use. This significantly improves overall structural rigidity and dynamic load-bearing capacity, ensuring patients maintain a stable posture on rough terrain or during bumpy transport, significantly reducing the risk of secondary injury. It also prevents the folding joints from bearing undesigned loads, extending the product's lifespan. Regarding functional integration, the infusion rod fixing function is integrated with the folding joints, allowing medical personnel to quickly and securely install infusion equipment without carrying a separate infusion stand. This simplifies rescue equipment configuration, saves on-site operating space, and allows infusion operations to be performed simultaneously with stretcher transport, effectively shortening emergency preparation time and securing crucial time during the golden rescue period. In terms of adaptability, the support height can be flexibly adjusted according to actual needs, quickly matching ambulance interfaces, adapting to uneven ground, or meeting the comfort requirements of patients in different positions, significantly expanding the stretcher's applicability in diverse rescue scenarios. In terms of portability, while ensuring that static and dynamic load-bearing strength meets medical safety standards, the overall weight is reasonably controlled, reducing the physical exertion of rescuers during long-distance transport in complex terrain. The optimized storage design results in a compact size, facilitating efficient storage in ambulance storage areas or rescue backpacks. Regarding ease of operation, the deployment and folding process is simple, allowing a single person to complete deployment and retrieval in a short time, greatly improving emergency response efficiency. These combined effects comprehensively enhance the stretcher's safety, functionality, environmental adaptability, and operational efficiency, effectively meeting the comprehensive performance requirements of modern emergency rescue stretcher equipment, and possessing outstanding practical value and promotional significance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the stretcher in its deployed state, provided in an embodiment of this application. Figure 2 A top view of the stretcher in its deployed state as provided in an embodiment of this application; Figure 3 This is an enlarged schematic diagram of the first type of pin assembly structure provided in the embodiments of this application; Figure 4 This is an enlarged schematic diagram of the second type of pin assembly structure provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the folding joint provided in the embodiments of this application; Figure 6 A schematic diagram of the overall structure of the stretcher installation and elevation assembly provided in the embodiments of this application in its deployed state; Figure 7 This is a schematic diagram of the structure of the jacking component provided in an embodiment of this application; Figure 8An enlarged schematic diagram of the connection structure between the load-bearing cloth and the telescopic stretcher pole provided in the embodiments of this application; Figure 9 This is a schematic diagram of the overall structure of the stretcher in its storage state provided in an embodiment of this application; Figure 10 This is a schematic diagram of the overall structure of the stretcher in its stored state from another perspective, as provided in an embodiment of this application. Figure 11 This is a schematic diagram of the overall structure of the stretcher installation and elevation component in its stowed state, as provided in an embodiment of this application.

[0021] Icons: 100, Telescopic stretcher pole; 110, First telescopic pole; 111, First telescopic pole connecting end; 112, Positioning hole; 120, Second telescopic pole; 121, Mounting hole; 122, Pin assembly; 1221, Fixing element; 1222, Spring; 1223, Locking pin; 130, Third telescopic pole; 140, Fourth telescopic pole; 200, Support assembly; 210, Support base; 211, Connecting protrusion; 211, Pin Shaft hole; 220, support rod; 230, hinge structure; 300, bearing cloth; 310, connecting belt; 400, folding joint; 410, folding joint seat; 411, semi-circular structure; 412, through hole; 420, connecting piece; 430, locking pin; 500, infusion rod; 510, mating hole; 600, shim assembly; 610, connector; 620, flip-up support foot; 621, convex structure; 622, concave structure. Detailed Implementation

[0022] To make the purpose, principle and structure of the present invention clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0023] See Figure 1 To Figure 11 The present invention provides a portable folding stretcher, the overall structure of which includes a telescopic stretcher rod 100, a support component 200, a load-bearing cloth 300 and a folding joint 400.

[0024] The telescopic stretcher pole 100 requires at least two telescopic pole sections connected together. The number of telescopic pole sections can be selected according to needs. The more telescopic pole sections there are, the smaller the size in the longitudinally folded state. At least one limiting structure needs to be set between each pair of adjacent telescopic pole sections. For example, Figure 1 As shown, a three-dimensional coordinate system is established, with the X-arrow direction representing the length direction of the stretcher (the direction in which the stretcher body extends), which is the longitudinal direction, or the front-to-back direction; the Y-arrow direction representing the vertical direction; and the Z-arrow direction representing the transverse direction, or the left-to-right direction.

[0025] Example: The telescopic stretcher pole 100 is composed of a first telescopic pole 110, a second telescopic pole 120, a third telescopic pole 130, and a fourth telescopic pole 140 connected in sequence along its length. With the folding joint 400 as the center of symmetry, the first telescopic pole 110, the second telescopic pole 120, the third telescopic pole 130, and the fourth telescopic pole 140 are symmetrically arranged on both sides of the folding joint 400. The two ends of the folding joint 400 are respectively hinged to the ends of the first telescopic poles 110 on both sides. Two sets of telescopic stretcher poles 100 are symmetrically arranged in the transverse direction, and a gap is left between the two sets of telescopic stretcher poles 100 to allow the supporting cloth 300 to be spread out to support the wounded.

[0026] The inner walls of the first telescopic rod 110 near the second telescopic rod 120, the second telescopic rod 120 near the third telescopic rod 130, and the third telescopic rod 130 near the fourth telescopic rod 140 are all provided with inner wall limiting structures to prevent the second telescopic rod 120, the third telescopic rod 130, and the fourth telescopic rod 140 from sliding out axially. The outer walls of the first telescopic rod 110, the second telescopic rod 120, and the third telescopic rod 130 near their proximal ends are all provided with outer wall limiting structures, which, together with the inner wall limiting structures, achieve bidirectional limiting of the telescopic rods and effectively prevent axial movement during use.

[0027] The inner wall limiting structure and the outer wall limiting structure include a pin assembly 122 between two adjacent telescopic tubes and an integrally formed annular protrusion or a detachable positioning sleeve.

[0028] Taking the pin assembly 122 between adjacent first telescopic rods 110 and second telescopic rods 120 as an example, those skilled in the art can set corresponding pin assemblies 122 between any other adjacent telescopic rods as needed. The first telescopic rod 110 has a positioning hole 112 at one end near the second telescopic rod 120, and the second telescopic rod 120 has a mounting hole 121 at one end near the first telescopic rod 110. A pin assembly 122 is provided between the two. The pin assembly 122 includes a fixing member 1221, a spring 1222, and a retaining pin 1223. The fixing member 1221 is fixed to the proximal end of the second telescopic rod 120 and internally accommodates the spring 1222 and the retaining pin 1223. When the first telescopic rod 110 and the second telescopic rod 120 are stretched to their maximum limits, the locking pin 1223 is engaged in the positioning hole 112 of the first telescopic rod 110 under the elastic force of the spring 1222, achieving dual axial and circumferential locking, ensuring structural stability after the stretcher is unfolded, preventing the force direction of the folding joint 400 from shifting, and greatly improving the overall structural rigidity.

[0029] The anti-torsion and locking effect of the pin assembly 122 is specifically manifested in the axial and circumferential cooperative constraint mechanism. When the first telescopic rod 110 and the second telescopic rod 120 are stretched to their maximum stroke, the locking pin 1223 is precisely embedded in the positioning hole 112 at the distal end of the first telescopic rod 110 under the continuous elastic force of the spring 1222. In terms of axial locking, the end face of the locking pin 1223 forms a rigid abutment with the bottom of the positioning hole 112, effectively blocking the tendency of the telescopic rod to retract under load and ensuring that the stretcher unfolding length is constant. In terms of circumferential anti-torsion, the outer circumferential side of the locking pin 1223 forms a tight annular mating surface with the hole wall of the positioning hole 112. When the stretcher is subjected to lateral impact, road bumps, or torsional torque generated by the patient's body movement during transport, this mating surface completely restricts the relative rotational freedom between the first telescopic rod 110 and the second telescopic rod 120 by transmitting shear stress. This dual-locking structure eliminates micro-movement gaps at the telescopic connection, significantly improving node stiffness and preventing local collapse, swaying, or force displacement of the folded joint 400 caused by joint loosening. Simultaneously, the preload provided by the spring 1222 ensures that the locking pin 1223 remains engaged with the positioning hole 112, maintaining locking reliability even under vibration conditions and ensuring structural integrity without additional operation. This design relies solely on the geometric fit between the positioning hole 112 and the locking pin 1223 to achieve its function, without introducing additional components. This simplifies the structure and enhances the stability and safety of the stretcher under dynamic conditions, providing a solid and reliable support foundation for patient transport. When unlocking to retract the telescopic rod, simply press the locking pin 1223 manually, causing it to retract into the positioning hole 112 along with the compression of the spring 1222, thus releasing the locking mechanism.

[0030] As a preferred embodiment, the present invention can be selected as either a pin assembly 122 structure with a unidirectional single-head locking pin 1223 or a pin assembly 122 structure with a bidirectional double locking pin 1223. Each end of the spring 1222 is connected to a locking pin 1223, and the two locking pins 1223 are pushed out toward the positioning hole 112.

[0031] The inner and outer wall limiting structures can be integrally formed annular protrusions or detachable positioning sleeves, which fit tightly with the inner and outer walls of the corresponding telescopic rods to ensure sufficient limiting strength. Furthermore, the inner and outer wall limiting structures, through their protrusions, obstruct and limit the connection holes between adjacent telescopic rods. This ensures that when adjacent telescopic rods are stretched to their maximum distance, a protruding limiting structure is provided at the end of the inner hole of the telescopic rod. The inner tube of the telescopic rod has an outward radial protrusion, and the outer tube has an inward radial protrusion. Together, they form a radial abutment and limiting at the telescopic holes of the inner and outer tubes, preventing the telescopic rods from disengaging. The inner and outer tube connection relationships between the first telescopic rod 110, the second telescopic rod 120, the third telescopic rod 130, and the fourth telescopic rod 140 can be selected according to requirements. This invention only limits the connection relationship between adjacent telescopic rods, not the inner and outer tube relationship between two telescopic rods. In this embodiment, the first telescopic rod 110 is set as the outermost outer tube, and the second telescopic rod 120, the third telescopic rod 130, and the fourth telescopic rod 140 are inner tubes that are nested together.

[0032] The distal end of the fourth telescopic pole 140 is fixed with a flexible buffer made of elastic materials such as rubber or silicone, which can absorb impact energy and protect the pole from damage if the stretcher is accidentally dropped. To reduce the overall weight, all telescopic poles are made of hollow round tubes made of carbon fiber composite materials, achieving a lightweight design while ensuring strength and rigidity, making it easy for rescuers to move the pole quickly.

[0033] A folding joint 400 is located in the middle of the stretcher and consists of two identical folding joint seats 410, a connecting piece 420, and a locking pin 430. The two folding joint seats 410 are hinged together by the connecting piece 420, allowing the stretcher to be flexibly folded in half along the middle for storage or unfolding. Each folding joint seat 410 has a semi-circular structure 411 at its upper end. When the stretcher is fully unfolded to 180 degrees, the two semi-circular structures 411 precisely assemble to form a complete circular insertion hole, specifically for inserting the IV pole 500. A through hole 412 is provided on the folding joint seat 410, which is strictly aligned with the mating hole 510 of the insertion end of the IV pole 500 when the stretcher is unfolded. The locking pin 430 passes sequentially through the through holes 412 of the two folding joint seats 410 and the mating hole 510 of the infusion rod 500, achieving a dual function: Firstly, the locking pin 430 rigidly connects the two folding joint seats 410, effectively preventing relative rotation around the connecting piece 420, ensuring the stretcher maintains its fully unfolded shape under load, and avoiding structural instability due to joint loosening; secondly, the locking pin 430 simultaneously and firmly locks the infusion rod 500 into the circular insertion hole, preventing the rod from shaking or falling off during infusion. This structure highly integrates the folding locking and infusion rod fixing functions, eliminating the need for an additional independent infusion stand, significantly simplifying on-site operation procedures and improving rescue efficiency. The folding joint 400 can be integrally formed by metal die casting or injection molded from high-strength lightweight materials such as carbon fiber composite materials or nylon with glass fiber, effectively controlling weight while ensuring structural strength and durability, and balancing portability and reliability. The entire design relies solely on through hole alignment and pin insertion to achieve functionality, resulting in a simple structure, intuitive operation, and allowing a single person to quickly complete locking and unlocking actions.

[0034] Specifically, the lower part of the folding joint seat 410 is provided with several spaced-apart fixing plates, which are arranged in parallel to form multiple gap spaces. The connecting plate 420 consists of multiple parallel metal or composite material thin plates, with both ends of each plate embedded in the gap between the fixing plates of two adjacent folding joint seats 410. The ends of the connecting plate 420 and the ends of the fixing plates are sequentially passed through by transverse pins, forming a double-pin-multi-layer hinge. When the first telescopic rods 110 on both sides move relative to each other, each connecting plate 420 rotates synchronously around the pins at both ends. Multiple plates work together to transmit the load, eliminating single-point wobbling and achieving smooth, low-friction hinged rotation. This allows the two first telescopic rods 110 to be hinged to the ends of the connecting plates 420 through the folding joint seat 410, achieving smooth relative rotation and completing the unfolding and folding of the stretcher. Furthermore, this multi-section hinge structure can expand the rotational range under the hinge, achieving highly flexible folding.

[0035] The upper part of the folding joint seat 410 is designed with a raised structure on one side and a recessed structure on the other side, with adjacent folding joint seats 410 arranged in an opposing manner. When the stretcher is fully extended, the raised end face of one folding joint seat 410 abuts tightly against the recessed end face of the opposite folding joint seat 410, forming a mechanical stop that effectively limits the extension angle and prevents joint overload deformation. The transverse inner surface of the raised structure has a semi-circular groove, forming a semi-circular structure 411, which precisely conforms to the outer contour of the infusion rod 500. When the two folding joint seats 410 are fully extended and abutting, the two semi-circular structures 411 precisely fit together to form a complete circular insertion hole, providing stable support for the infusion rod 500. This convex-concave fit structure not only achieves precise alignment but also disperses the load through end face contact, significantly enhancing joint rigidity and avoiding reliance on the locking pin 430 to bear the entire torsional moment, thus significantly improving the structural stability and safety of the stretcher during dynamic transport.

[0036] The support assembly 200 includes a support base 210, a support rod 220, and a hinge structure 230. Two sets are symmetrically arranged along the longitudinal X-axis. The support assembly 200 is horizontally arranged, with each end connected to a telescopic stretcher rod 100, forming a lateral support between two adjacent telescopic stretcher rods 100. The support base 210 is located at the end of the second telescopic rod 120 away from the first telescopic rod 110. One end of the support rod 220 is hinged to the support base 210. The hinge structure 230 is located between the two support rods 220, and both ends of the hinge structure 230 are hinged to the support rods 220. A set of support base 210, support rod 220, and hinge structure 230 forms a laterally stable triangular support structure along the Z-axis.

[0037] A detachable elevation component 600 is attached to the support base 210. This component includes a connector 610 and flip-up legs 620. One end of the connector 610 is fixedly connected to the support base 210, and the other end is hinged to the flip-up legs 620, allowing the flip-up legs 620 to be flipped and stored or unfolded relative to the support base 210 for support. The elevation component 600 has four flip-up legs 620, two of which are convex structures 621 and the other two are concave structures 622, diagonally distributed on the left and right sides of the stretcher. When stored, the convex structures 621 and concave structures 622 interlock, significantly reducing the storage volume. By adjusting the unfolding angle of the flip-up legs 620, the stretcher support height can be flexibly changed to adapt to different usage scenarios.

[0038] The support fabric 300 is laid between the left and right telescopic stretcher poles 100, and its edges are fixed to the poles via a connecting structure. Specifically, the inner side of the support base 210 and the inner side of the distal end of the third telescopic pole 130 are provided with connecting protrusions 211. Each connecting protrusion 211 includes two adjacent ear plates, and each ear plate of the connecting protrusion 211 has a radially formed pin hole 2111, through which a pin passes. Several connecting straps 310 are fixed to the edges of both sides of the support fabric 300. The connecting straps 310 are fabric sleeves, which are fitted onto the pins between the ear plates of the connecting protrusions 211, enabling a detachable connection between the support fabric 300 and the telescopic stretcher poles 100. This structure facilitates the replacement and cleaning of the support fabric 300, extending the service life of the stretcher. Safety belt assemblies, including straps and matching buckles, are symmetrically arranged on both sides of the support fabric 300. These assemblies can wrap around the patient's body and be quickly secured and unlocked, ensuring safety and stability during transport.

[0039] In use, rescuers first remove the folded stretcher, grasp the first telescopic rod 110 of the two horizontal telescopic stretcher rods 100, and then grasp the end of the fourth telescopic rod 140 and pull it away from the first telescopic rod 110, thereby causing the second telescopic rod 120 and the third telescopic rod 130 to slide out in sequence. When the telescopic rod is stretched to its maximum limit, the locking pin 1223 of the pin assembly 122 automatically engages with the positioning hole 112 under the action of the spring 1222, realizing the axial and circumferential locking of the telescopic rod. At the same time, the folding joint 400 is rotated to a fully unfolded state of 180 degrees, at which point the two semi-circular structures 411 are combined into a complete circle. Next, the two side support assemblies 200 are flipped outward and unfolded. Grasping the first telescopic rod 110 of the two horizontal telescopic stretcher rods 100, the rescuers stretch it laterally, causing the support assembly 200 to unfold laterally. The support rod 220 changes from an adjacent folded state to an unfolded straight horizontal support structure. Depending on the ground conditions and usage requirements, it is optional to install the elevation assembly 600. To adjust the support height, flip the outrigger 620 from its stored position to its supporting position, allowing the convex structure 621 and concave structure 622 to unfold outwards and form a stable support. Then, insert the infusion rod 500 into the circular insertion hole formed by the folding joint 400, and secure it with the locking pin 430 passing through the through hole 412 and the mating hole 510. Finally, place the patient on the support fabric 300 and secure them with the safety belt assembly for transport.

[0040] When storage is required, first release the patient from the restraints, pull out the locking pin 430, and retract the IV pole 500. Fold the support assembly 200 under the telescopic stretcher pole 100. If the elevating assembly 600 is installed, flip it to the storage position so that the convex structure 621 and the concave structure 622 interlock. Press the locking pin 1223 of the pin assembly 122 to disengage it from the positioning hole 112, then push the telescopic poles back to the socketed state in sequence, fold the joint 400 in half to retract, and finally form a compact storage shape, greatly reducing the volume and making it easy to carry and store. The entire unfolding and folding process is simple to operate and can be completed by a single person in a short time, greatly improving emergency response efficiency.

[0041] This portable folding stretcher, through multiple technological improvements, overcomes several shortcomings of existing stretchers. The bidirectional limiting design of the telescopic rod and the dual locking mechanism of the pin assembly effectively prevent axial movement and circumferential rotation during use, improving structural stability. The folding joint integrates an IV pole connector, eliminating the need to carry a separate IV stand and simplifying rescue equipment configuration. Adjustable height adjustment components allow for flexible support height, adapting to different usage scenarios. The application of carbon fiber composite materials significantly reduces overall weight, facilitating rapid transport by rescue personnel. The optimized storage structure results in a compact size, saving storage space. The connection design between components emphasizes a balance between reliability and convenience, ensuring structural stability during use while facilitating rapid unfolding and storage. These synergistic technological features significantly improve the stretcher's structural stability, functional integration, environmental adaptability, and ease of operation, fully meeting the high standards of modern emergency rescue equipment and providing reliable guarantees for improved rescue efficiency and patient safety. In practical applications, this stretcher can maintain a stable posture on rough roads or during bumpy transport, significantly reducing the risk of secondary injury. At the same time, it simplifies on-site operation procedures, buys critical time during the golden rescue period, and has outstanding practical value and broad market prospects.

[0042] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the invention, based on the technical solution and concept of the invention, should be covered within the scope of protection of the invention.

Claims

1. A portable folding stretcher, comprising: Two sets of telescopic stretcher poles (100) are symmetrically arranged in the transverse direction. Each set consists of multiple telescopic poles that are sequentially connected along its length. The telescopic rod includes at least two first telescopic rods (110) arranged longitudinally, and at least two second telescopic rods (120) respectively sleeved with the first telescopic rods (110). The folding joint (400) is located in the middle of the telescopic stretcher pole (100), and its two ends are respectively connected to the connecting ends (111) provided on the two first telescopic poles (110); A support assembly (200) is mounted on a telescopic stretcher pole (100); The supporting fabric (300) is laid between the two sets of telescopic stretcher poles (100) and fixedly connected to the poles; Its features are: A pin assembly (122) is provided between the first telescopic rod (110) and the second telescopic rod (120). The pin assembly (122) includes a fixing member (1221), a locking pin (1223) and a spring (1222) housed therein. The fixing member (1221) is fixed to one end of the second telescopic rod (120) near the first telescopic rod (110). When the first telescopic rod (110) and the second telescopic rod (120) are stretched to their maximum limits, the locking pin (1223) pops out under the action of the spring (1222) and locks into the positioning hole (112) provided at the end of the first telescopic rod (110) away from the connecting end (111), thereby achieving circumferential and axial locking of the second telescopic rod (120) relative to the first telescopic rod (110); The folding joint (400) includes two identical folding joint seats (410) hinged together by a connecting piece (420). The upper part of each folding joint seat (410) includes a protrusion structure with a semi-circular structure (411) on the protrusion structure. When the stretcher is unfolded, the two semi-circular structures (411) are joined together to form a circular insertion hole for inserting an infusion rod (500).

2. The portable folding stretcher as described in claim 1, characterized in that: The telescopic stretcher pole (100) is composed of a first telescopic pole (110), a second telescopic pole (120), a third telescopic pole (130), and a fourth telescopic pole (140) connected together along its length. The inner walls of the first telescopic rod (110) near the second telescopic rod (120), the second telescopic rod (120) near the third telescopic rod (130), and the third telescopic rod (130) near the fourth telescopic rod (140) are all provided with inner wall limiting structures to prevent the second telescopic rod (120), the third telescopic rod (130), and the fourth telescopic rod (140) from sliding out axially. The first telescopic rod (110), the second telescopic rod (120), and the third telescopic rod (130) are all provided with an outer wall limiting structure on their near-end outer walls, which, together with the inner wall limiting structure, realize bidirectional limiting of the telescopic rod.

3. A portable folding stretcher as described in claim 2, characterized in that: The inner wall limiting structure of the first telescopic rod (110), the second telescopic rod (120), and the third telescopic rod (130) is an integrally formed annular protrusion or a detachable positioning sleeve. The outer wall limiting structure of the first telescopic rod (110), the second telescopic rod (120), and the third telescopic rod (130) is an integrally formed annular protrusion or a detachable positioning sleeve. The outer contours of the inner wall limiting structure and the outer wall limiting structure are similar to the inner wall and outer wall of the corresponding telescopic rod to ensure the limiting strength.

4. A portable folding stretcher as described in claim 1, characterized in that: The upper part of the folding joint seat (410) has a raised structure on one side and a recessed structure on the other side. Two adjacent folding joint seats (410) are arranged opposite each other. When the first telescopic rod (110) is unfolded, the end face of the raised structure abuts against the end face of the recessed structure of the opposite folding joint seat (410). The folding joint seat (410) has a semi-circular structure (411) with a semi-circular groove on the transverse inner side of the protruding structure. It conforms to the outer contour of the infusion rod (500); The upper part of the folding joint seat (410) is also provided with a through hole (412) laterally, and the insertion end of the infusion rod (500) is provided with a mating hole (510). The locking pin (430) passes through the through holes (412) of the two opposing folding joint seats (410) and the mating hole (510) of the infusion rod (500) at the same time, so as to realize the rotational locking of the folding joint (400) itself and the fixation between it and the infusion rod (500); The lower part of the folding joint seat (410) is provided with a number of spaced fixing pieces and a number of connecting pieces (420) arranged in parallel. The two ends of the connecting pieces (420) are respectively set in the interval between the fixing pieces of two adjacent folding joint seats (410). The pin passes through the end of the connecting piece (420) and the end of the fixing piece laterally, forming a structure in which two adjacent first telescopic rods (110) are hinged to the connecting pieces (420) through the folding joint seat (410); The folding joint (400) is formed by metal die casting or by injection molding of carbon fiber composite material or nylon with glass fiber.

5. A portable folding stretcher as described in claim 2, characterized in that: A flexible buffer is fixed to the end of the fourth telescopic rod (140) away from the third telescopic rod (130). The flexible buffer is made of elastic material to alleviate the hard impact when the stretcher is accidentally dropped and to prevent damage to the rod.

6. A portable folding stretcher as described in claim 2, characterized in that: The first telescopic rod (110), the second telescopic rod (120), the third telescopic rod (130), and the fourth telescopic rod (140) of the telescopic stretcher rod (100) are all hollow round tubes made of carbon fiber composite material, which achieves lightweight design of the stretcher while ensuring the strength and rigidity of the rod structure.

7. A portable folding stretcher as described in claim 1, characterized in that: The support assembly (200) includes a support base (210) on which a shim assembly (600) is detachably connected. The elevation assembly (600) includes a connector (610) and a flip-up leg (620). One end of the connector (610) is fixedly connected to the support base (210), and the other end is hinged to the flip-up leg (620), forming a flip-up leg (620) that can be flipped and stored or unfolded relative to the support base (210). The flip-up support (620) is provided in four parts, two of which are convex structures (621) and the other two are concave structures (622). The four flip-up support (620) are diagonally distributed on the horizontal support seats (210) on both sides of the stretcher. When stored, the convex structure (621) and the concave structure (622) are interlocked to reduce the storage volume of the padding component (600).

8. A portable folding stretcher as described in claim 1, characterized in that: The support assembly (200) includes a support base (210). The inner side of the support base (210) and the inner side of the telescopic stretcher rod (100) are provided with a number of connecting protrusions (211). The connecting protrusions (211) include two adjacent ear plates. The ear plates of the connecting protrusions (211) are provided with pin holes (2111) in the radial direction. Several connecting straps (310) are fixed to both sides of the supporting fabric (300), and the ends of the connecting straps (310) are located between the ear plates of the connecting protrusions (211). The pin is inserted into the pin hole (2111) and its two ends are detachably connected to the ear plate of the connecting protrusion (211). The pin also passes through the sleeve of the end of the connecting belt (310) and fixes the connecting belt (310) to the connecting protrusion (211), so as to realize the detachable fixed connection between the bearing cloth (300) and the telescopic stretcher rod (100).

9. A portable folding stretcher as described in claim 1, characterized in that: The support fabric (300) is symmetrically provided with safety belt assemblies on both sides. The safety belt assembly includes a strap and a matching buckle. The strap can be wrapped around the patient and the buckle can be used to quickly fix and unlock the patient.

10. A portable folding stretcher as described in claim 1, characterized in that: The support component (200) includes: At least two support bases (210) are symmetrically arranged on the telescopic stretcher poles (100) on both sides of the transverse direction. At least two support rods (220) are symmetrically arranged on the telescopic stretcher rods (100) on both sides of the transverse direction, and their ends are hinged to the support base (210); At least one hinge structure (230) is disposed between two transverse support rods (220), and its two ends are respectively hinged to the ends of the two support rods (220); The support base (210) is mounted on the second telescopic rod (120); The support components (200) are symmetrically arranged in two sets along the folding joint (400) to achieve lateral support and storage of the telescopic stretcher pole (100).

Images