Lower limb supporting traction device

Abstract

The invention discloses a lower limb supporting and traction device, which belongs to the technical field of medical instruments and comprises a fixed frame, a movable frame telescopically connected with the fixed frame, a tail frame connected with the movable frame and supporting cloth for supporting legs. The device further comprises a winding box, a traction assembly and a guide limiting assembly. The winding box is arranged at one end of the fixing frame and used for containing and winding the supporting cloth. The traction assembly is arranged on the tail frame and detachably connected with the traction end of the supporting cloth through a traction cable, the guide limiting assembly comprises reinforcing strips arranged on the edges of the two sides of the supporting cloth and strip-shaped clamping grooves correspondingly formed in the two sides of the fixed frame, the movable frame and the tail frame, the clamping grooves extend in the length direction, and the reinforcing strips are clamped into the clamping grooves in a sliding mode. The supporting cloth is controlled to be pulled out and retracted through the traction assembly, and stable movement of the supporting cloth is ensured through the guide limiting assembly, so that the effective bearing length of the supporting cloth is matched with the stretching amount of the frame body, and the use comfort and convenience are improved.

Description

Technical Field

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

[0002] A commonly used fixation and traction device after lower limb fractures or traction reduction is often called a Blanc frame. This device generally includes a support structure for placing the lower limb. In the prior art, there are Blanc frames with adjustable length, which consist of a fixed main frame and a movable frame that can slide and extend along its length, thereby achieving adjustment of the overall support length to accommodate the fixation needs of different patients' heights or different limbs.

[0003] However, adjustable Braun frames have shortcomings in practical use. The length of the support components (usually canvas straps or similar soft supports) that directly support the legs is fixed. When adjusting the frame's extension to accommodate limb length, the fixed-length support fabric cannot adapt. When the frame shortens, the support fabric becomes too long, sagging and bunching up, failing to provide stable and close support for the legs; conversely, when the frame extends, the support fabric becomes too short to effectively cover and support the extended limbs. The inability to adjust the length of the support fabric according to the frame's extension or retraction affects user comfort. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a lower limb support traction device, so that the length of the support cloth can be adjusted adaptively with the extension and contraction of the frame.

[0005] A lower limb support traction device includes a fixed frame, a movable frame retractably connected to the fixed frame, a tail frame connected to the movable frame, and a support cloth for supporting the legs. It also includes a winding box, a traction assembly, and a guide and limiting assembly. The winding box is located at one end of the fixed frame and is used to accommodate and wind up the support cloth. The traction assembly is located at the tail frame and is detachably connected to the traction end of the support cloth via a traction cable. The guide and limiting assembly includes reinforcing strips located on both sides of the support cloth and strip-shaped slots corresponding to the fixed frame, movable frame, and tail frame. The slots extend along the length direction, and the reinforcing strips can be slidably inserted into the slots.

[0006] Furthermore, the take-up box is equipped with a first roller and a rewinding mechanism. The support fabric is wound around the first roller, and the rewinding mechanism is connected to the end of the first roller via a transmission connection.

[0007] Furthermore, the rewinding mechanism includes a rotating component, a shaft seat on the rotating component, and a buckle on the shaft seat. The first reel is locked into the shaft seat and secured by the buckle.

[0008] Furthermore, the rewinding mechanism includes a fixed seat and a mainspring. The fixed seat is fixed to the inner wall of the winding box, one end of the mainspring is fixed to the fixed seat, and the other end of the mainspring is fixed to the rotating component. The rotating component has a convex shaft on its side, and the fixed seat has a shaft hole. The convex shaft is rotatably connected to the shaft hole.

[0009] Furthermore, the traction assembly includes a second reel and two rope pulleys fixed thereon. The second reel is rotatably mounted on the tailstock, and the traction cables on both sides are wound around the two rope pulleys respectively.

[0010] Furthermore, the traction assembly also includes a drive gear, a driven gear, an input shaft, a ratchet, and a pawl. The drive gear is mounted on the input shaft, the driven gear is mounted on the second spool, the drive gear meshes with the driven gear, the ratchet is mounted on the input shaft, and the pawl is hinged to the tailstock via a torsion spring and acts on the ratchet.

[0011] Furthermore, the input shaft is connected to a drive handle, and the pawl's hinge shaft is connected to an unlocking handle.

[0012] Furthermore, the side wall of the winding box has an opening for the support fabric to pass through. A clamping mechanism is provided at the opening, which includes a pressure plate, a base plate, a positioning seat, a guide rod, a spring, and an adjusting bolt. The pressure plate and the base plate are positioned opposite each other on the upper and lower sides of the opening. The positioning seat is fixed on the winding box. The lower end of the guide rod is connected to the pressure plate, and the upper end of the guide rod passes through a guide hole opened on the positioning seat. The spring is sleeved on the guide rod and provides an upward elastic force to the pressure plate. The adjusting bolt is threaded to the positioning seat, and its lower end acts on the pressure plate.

[0013] Furthermore, the traction cable and the support fabric traction end are detachably connected via a connecting ring and a connecting hook. The connecting hook is located at the end of the reinforcing strip, and the connecting ring is located at the end of the traction cable.

[0014] Furthermore, the cross-section of the strip groove is C-shaped, with its opening facing inward, and the width of the opening is less than the maximum width of the reinforcing strip's cross-section.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting up a winding box, traction components and guide limit components, the effective length of the support cloth can be adjusted synchronously with the extension and retraction of the movable frame. This solves the problem that the fixed length of the support cloth in the adjustable length Blanc frame cannot adapt to the changes in the length of the frame, and ensures stable support for the legs in different extension and retraction states.

[0017] 2. The sliding fit structure between the reinforcing strip and the strip groove in the guide and limiting assembly provides stable guidance for the telescopic movement of the support cloth, effectively preventing its deviation, twisting or detachment, and enhancing the controllability and reliability of the device operation.

[0018] 3. The entire adjustment mechanism is tightly integrated with the frame and has a reasonable structure. While achieving adaptive adjustment of the support cloth length, it maintains the simplicity and ease of operation of the device, improving its adaptability and convenience for clinical use. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A magnified view of area A in the middle.

[0021] Figure 3 This is a schematic diagram of the winding box according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the support fabric and reinforcing strip in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the first reel and rewind mechanism in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the bearing seat and the buckle in an embodiment of the present invention.

[0025] Figure 7 This is an exploded view of the rewinding mechanism according to an embodiment of the present invention.

[0026] Figure 8 This is a cross-sectional view of the clamping mechanism according to an embodiment of the present invention.

[0027] Figure 9 This is a structural schematic diagram of the tailstock and traction assembly according to an embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure of the second reel and the winding wheel in an embodiment of the present invention.

[0029] Figure 11 This is a schematic diagram of the driven gear, driving gear, ratchet, and pawl in an embodiment of the present invention.

[0030] The diagram labels are as follows: 1. Fixed frame; 2. Movable frame; 3. Tailstock; 4. Rewind box; 5. Guide and limit assembly; 501. Reinforcing strip; 502. Slot; 6. Traction cable; 7. Support cloth; 8. Rewinding mechanism; 801. Rotating component; 802. Fixed seat; 803. Spring; 804. Protruding shaft; 805. Shaft hole; 9. First reel; 10. Buckle; 11. Pressing mechanism; 1101. Pressure plate; 1102. Base plate; 1103. Positioning seat; 1104. Guide rod; 1105. Spring; 1106. Nut; 1107. Guide hole; 1108. Adjusting bolt; 1109. Protrusion; 12. Traction assembly; 1201. Second reel; 1202. Rope winding wheel; 1203. Driven gear; 1204. Drive gear; 1205. Ratchet; 1206. Input shaft; 1207. Pawl; 1208. Torsion spring; 1209. Drive handle; 1210. Unlock handle; 13. Shaft seat; 14. Connecting hook; 15. Connecting ring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] like Figure 1 and Figure 8 As shown, the lower limb support and traction device of this embodiment includes a fixed frame 1, a movable frame 2 that is telescopically connected to the fixed frame 1, a tail frame 3 connected to the movable frame 2, and a support cloth 7 for supporting the legs. Addressing the deficiency in the prior art where the length of the Blanc frame is adjustable but the length of its support cloth is fixed, this embodiment adds a synergistic winding box 4, a traction component 12, and a guide and limiting component 5, enabling the length of the support cloth 7 to be synchronously adjusted as the frame extends and retracts.

[0033] The take-up box 4 is fixedly mounted at the end of the mounting frame 1. It houses and winds up the support fabric 7, specifically through a first reel 9 and a rewind mechanism 8, which enables the storage and automatic retraction of the support fabric 7. The rewind mechanism 8 provides rewinding force to the support fabric 7. This rewind mechanism 8 includes a fixed base 802 fixed to the inner wall of the take-up box 4 and a spring 803 connecting the fixed base 802 and a rotating member 801. The rotating member 801 has a protruding shaft 804 on its side, and the fixed base 802 has a shaft hole 805. The protruding shaft 804 is rotatably connected to the shaft hole 805. The rotating member 801 is detachably fixed to the end of the first reel 9 via a shaft seat 13 and a buckle 10, facilitating the removal of the support fabric 7 from the take-up box 4 for cleaning. The first spool 9 has a D-shaped cross-section, and the shaft seat 13 and the buckle 10 also form a D-shaped inner hole to ensure that the rotation of the first spool 9 can be reliably transmitted to the rotating component 801, thereby tightening or releasing the spring 803. This D-shaped fit prevents the first spool 9 and the rotating component 801 from rotating relative to each other. When the support cloth 7 is pulled outward, the spring 803 is tightened, storing elastic potential energy; when it needs to be rewound, the spring 803 releases energy, driving the rotating component 801 and the first spool 9 to rotate, thereby automatically retracting the support cloth 7 into the box. This design not only achieves neat storage of the support cloth 7 but also provides a retraction force for the adjustment process.

[0034] To ensure the support fabric 7 remains stable and straight during expansion and contraction, a guide and limiting component 5 is provided. This guide and limiting component 5 includes reinforcing strips 501 located at both edges of the support fabric 7, and strip-shaped slots 502 correspondingly located on both sides of the fixed frame 1, movable frame 2, and tail frame 3. The slots 502 extend along their length, and the reinforcing strips 501 can slidably engage with them. The reinforcing strips 501 have a diameter ranging from 3mm to 8mm, for example, 5mm, and can be made of nylon or polypropylene, possessing a certain degree of flexibility to accommodate the bending of the support fabric 7. They are fixed to the edge of the support fabric 7 by stitching. The cross-section of the strip-shaped slots 502 is preferably C-shaped, with the opening facing inwards, and the width of this opening is less than the maximum width of the cross-section of the reinforcing strip 501, thus forming a sliding connection that prevents detachment. The guide and limit assembly 5 simultaneously achieves the dual functions of guidance and structural reinforcement. Firstly, the sliding connection provides constraint on the movement of the support cloth 7 to prevent deviation. Secondly, the cooperation between the reinforcing strip 501 and the rigid slot 502 can distribute part of the load borne by the support cloth 7 to the fixed frame 1, the movable frame 2 and the tail frame 3, thereby improving the stress state of the soft support components.

[0035] In addition, the side wall of the winding box 4 has an opening for the support cloth 7 to pass through. To further ensure the stability of the length of the support cloth 7 after it extends, a clamping mechanism 11 is provided at the opening. Its main function is to clamp one end of the support cloth 7, ensuring that the support cloth 7 can be stably maintained at the required length in the non-adjusted state, providing support for the lower limbs. The clamping mechanism 11 includes a pressure plate 1101, a base plate 1102, a positioning seat 1103, a guide rod 1104, a spring 1105, and an adjusting bolt 1108. The pressure plate 1101 and the base plate 1102 are respectively disposed on the upper and lower sides of the opening. The positioning seat 1103 is fixed on the winding box 4. The lower end of the guide rod 1104 is connected to the pressure plate 1101, and the upper end of the guide rod 1104 passes through the guide hole 110 opened on the positioning seat 1103. 7. Spring 1105 is sleeved on guide rod 1104 and provides upward elastic force to pressure plate 1101. Specifically, the upper end of guide rod 1104 is connected to nut 1106, and nut 1106 and guide rod 1104 form a T-shaped structure. The lower end of spring 1105 abuts against positioning seat 1103, and the upper end is pressed by nut 1106 fixed to the top of guide rod 1104, so that pressure plate 1101 has a tendency to move away from base plate 1102. Adjusting bolt 1108 is threadedly connected to positioning seat 1103, and its lower end acts on pressure plate 1101 to resist elastic force and press pressure plate 1101 against support cloth 7.

[0036] Preferably, the surface of the pressure plate 1101 facing the base plate 1102 is provided with serrated protrusions 1109 to increase friction and prevent the support cloth 7 from slipping.

[0037] To achieve control and locking of the extension length of the support fabric 7, such as Figures 9-11 The traction component 12 is installed on the tail frame 3. The traction component 12 is detachably connected to the traction end of the support cloth 7 via the traction cable 6. Specifically, it is connected by a connecting ring 15 and a connecting hook 14. The connecting hook 14 is located at the end of the reinforcing bar 501, and the connecting ring 15 is located at the end of the traction cable 6. This allows the traction force to be evenly applied to the support cloth 7 through the reinforcing bar 501. This detachable connection design allows the support cloth 7 to be removed separately for cleaning or replacement, improving hygiene and maintenance convenience. The traction cable 6 can also guide the reinforcing bar 501 into the slot 502.

[0038] Specifically, the traction assembly 12 includes a second spool 1201 and two rope-winding pulleys 1202 fixed thereon. The second spool 1201 is rotatably mounted on the tailstock 3, and the traction cables 6 on both sides are wound around the two rope-winding pulleys 1202 respectively. To provide effortless and lockable traction operation, the traction assembly 12 also includes a drive gear 1204, a driven gear 1203, an input shaft 1206, a ratchet 1205, and a pawl 1207. The drive gear 1204 is mounted on the input shaft 1206, and the driven gear 1203 is mounted on the second spool 1201. The drive gear 1204 meshes with the driven gear 1203 to form a reduction mechanism, making operation effortless. The ratchet 1205 is mounted on... On the input shaft 1206, a pawl 1207 is hinged to the tailstock 3 via a torsion spring 1208 and acts on the ratchet 1205. Specifically, the torsion spring 1208 is sleeved on the hinge shaft of the pawl 1207, with one end inserted into a hole on the pawl 1207 and the other end abutting against a post on the tailstock 3, thereby providing the pawl 1207 with a continuous elastic torque pressing against the ratchet 1205, thus achieving one-way self-locking and automatically preventing reverse rotation when traction stops. A drive handle 1209 is connected to the input shaft 1206, and an unlocking handle 1210 is connected to the hinge shaft of the pawl 1207 for manually releasing the one-way lock.

[0039] This invention achieves the matching of the length of the support cloth 7 with the extension and retraction of the fixed frame 1 and the movable frame 2 through the winding box 4, guide and limit assembly 5, pressing mechanism 11, and traction assembly 12. Its working principle is as follows: When the support cloth 7 needs to be extended to accommodate the frame extension, the operator cranks the drive handle 1209. Power is transmitted to the second reel 1201 through the meshing drive gear 1204 and driven gear 1203, thereby winding the traction cable 6 and smoothly pulling the support cloth 7 out of the winding box 4. During this process, the ratchet 1205 and pawl 1207 cooperate under the action of the torsion spring 1208 to achieve unidirectional transmission locking. When the support cloth 7 needs to be shortened, the unlocking handle 1210 is operated to disengage the pawl 1207 from the ratchet 1205, releasing the lock. At this time, under the action of the rewinding mechanism 8 inside the winding box 4, the support cloth 7 can be automatically pulled back into the winding box 4, the traction cable 6 is pulled out accordingly, and the second reel 1201 is passively reversed to release the rope. The reinforcing strips 501 on both sides of the support fabric 7 slide in the slots 502 on the frame, ensuring a smooth and straight extension and retraction process without any deviation or twisting. The clamping mechanism 11 provides adjustable friction through the adjusting bolts 1108 to help balance the rewinding force of the spring 803, ensuring that the support fabric 7 can stably support the legs at any length.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lower limb support traction device, comprising a fixed frame (1), a movable frame (2) retractably connected to the fixed frame (1), a tail frame (3) connected to the movable frame (2), and a support cloth (7) for supporting the legs, characterized in that, Also includes: A winding box (4) is provided at one end of the fixing frame (1) for accommodating and winding up the support cloth (7). The traction assembly (12), located on the tailstock (3), is detachably connected to the traction end of the support fabric (7) via a traction cable (6). The guide limiting component (5) includes reinforcing strips (501) disposed on both sides of the support cloth (7) and strip slots (502) disposed on both sides of the fixed frame (1), movable frame (2) and tail frame (3), the slots (502) extending along the length direction, and the reinforcing strips (501) being slidably inserted into the slots (502).

2. The lower limb support and traction device according to claim 1, characterized in that, The take-up box (4) is provided with a first roll (9) and a rewinding mechanism (8). The support cloth (7) is wound on the first roll (9). The rewinding mechanism (8) is connected to the end of the first roll (9) via a transmission.

3. The lower limb support and traction device according to claim 2, characterized in that, The rewinding mechanism (8) includes a rotating component (801), on which a bearing seat (13) is provided, and a buckle (10) is provided on the bearing seat (13). The first reel (9) is inserted into the bearing seat (13) and then fixed by the buckle (10).

4. The lower limb support and traction device according to claim 3, characterized in that, The rewinding mechanism (8) includes a fixed seat (802) and a spring (803). The fixed seat (802) is fixed to the inner wall of the winding box (4). One end of the spring (803) is fixed to the fixed seat (802), and the other end of the spring (803) is fixed to the rotating member (801). The rotating member (801) has a convex shaft (804) on its side. The fixed seat (802) has a shaft hole (805), and the convex shaft (804) is rotatably connected to the shaft hole (805).

5. The lower limb support and traction device according to claim 1, characterized in that, The traction assembly (12) includes a second spool (1201) and two rope reels (1202) fixed thereon. The second spool (1201) is rotatably mounted on the tailstock (3), and the traction cables (6) on both sides are wound around the two rope reels (1202) respectively.

6. The lower limb support and traction device according to claim 5, characterized in that, The traction assembly (12) further includes a drive gear (1204), a driven gear (1203), an input shaft (1206), a ratchet (1205), and a pawl (1207). The drive gear (1204) is mounted on the input shaft (1206), the driven gear (1203) is mounted on the second reel (1201), the drive gear (1204) meshes with the driven gear (1203), the ratchet (1205) is mounted on the input shaft (1206), and the pawl (1207) is hinged to the tailstock (3) by a torsion spring (1208) and acts on the ratchet (1205).

7. The lower limb support and traction device according to claim 6, characterized in that, The input shaft (1206) is connected to a drive handle (1209), and the pawl (1207) is connected to an unlocking handle (1210) on its hinge shaft.

8. The lower limb support and traction device according to claim 1, characterized in that, The side wall of the winding box (4) has an opening for the support cloth (7) to pass through. A clamping mechanism (11) is provided at the opening. The clamping mechanism (11) includes a pressure plate (1101), a base plate (1102), a positioning seat (1103), a guide rod (1104), a spring (1105), and an adjusting bolt (1108). The pressure plate (1101) and the base plate (1102) are positioned opposite each other on the upper and lower sides of the opening. The positioning seat (1103) is fixed to the... On the winding box (4), the lower end of the guide rod (1104) is connected to the pressure plate (1101), the upper end of the guide rod (1104) passes through the guide hole (1107) opened on the positioning seat (1103), the spring (1105) is sleeved on the guide rod (1104) and provides an upward elastic force to the pressure plate (1101); the adjusting bolt (1108) is threadedly connected to the positioning seat (1103), and its lower end acts on the pressure plate (1101).

9. The lower limb support and traction device according to claim 1, characterized in that, The traction cable (6) and the traction end of the support cloth (7) are detachably connected to the connecting hook (14) via a connecting ring (15). The connecting hook (14) is located at the end of the reinforcing strip (501), and the connecting ring (15) is located at the end of the traction cable (6).

10. The lower limb support and traction device according to claim 1, characterized in that, The cross-section of the strip groove (502) is C-shaped, with its opening facing inward, and the width of the opening is less than the maximum width of the cross-section of the reinforcing strip (501).

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