Detachable hip and knee dual-mode self-adaptive cold compress device

Abstract

The invention discloses a detachable hip and knee dual-mode self-adaptive cold compress device which comprises an outer packing body, and a clamping mechanism is arranged in the outer packing body. The clamping mechanism comprises a sliding rail, the sliding rail is arranged at the inner bottom of the outer packaging body, a first side heat preservation plate and a second side heat preservation plate are symmetrically arranged on the sliding rail, and the first side heat preservation plate and the second side heat preservation plate are slidably connected to the sliding rail through automatic adjusting assemblies. One side of the first side insulation board and one side of the second side insulation board are further provided with an outer fixing assembly; self-adaptive fixing mechanisms are further arranged on the two sides of the outer packaging body, each self-adaptive fixing mechanism comprises an outer side fixing structure and an inner side fixing structure, the phase change cold compress structure can be rapidly disassembled and assembled, the phase change cold compress structure is convenient to replace and operate, the outer packaging body can be independently disinfected conveniently, the phase change cold compress structure cannot slip off in the using process, and the phase change cold compress structure is convenient to use. The cold insulation time is long, the hardness is high after the whole body is frozen, and the cold compress treatment on knee joints or hip joints can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a detachable hip and knee dual-mode adaptive cold compress device. Background Art

[0002] After orthopedic surgery, ice packs are needed to reduce the sensitivity of nerve endings, thereby alleviating pain, while slowing down the inflammatory process and further reducing the pain level, especially after hip or knee replacement surgery.

[0003] For example, the invention disclosed in the announcement number CN120053185A is an orthopedic clinical ice compress device, which includes: an ice compress bag, which has an ice water inlet and an ice water outlet, and is divided into a strip ice compress area, an arc ice compress area and an ice compress region in sequence inside; a main channel connecting the ice water inlet and the ice water outlet is provided in the ice compress bag, and the main channel connects the strip ice compress area, the arc ice compress area and the ice compress region in sequence; a first plugging port, which is provided on the ice compress bag and connects the main channel between the strip ice compress area and the arc ice compress area; a second plugging port, which is provided on the ice compress bag and connects the main channel between the arc ice compress area and the ice compress region; two plungers are provided and are respectively inserted in the first plugging port and the second plugging port, for adjusting the flow of the corresponding main channel or discharging the ice water in the corresponding area after being pulled out; a Velcro fleece surface and a Velcro hook surface. This solution can reasonably utilize the ice compress effects of different ice compress areas through the flexible use of the plunger in the first plugging port and the second plugging port to achieve more precise ice compress control. However, the above solution is an integral structure, and the ice pack cannot be disassembled and replaced, and is not easy to disinfect. At the same time, the ice pack medium is water, and its freezing cold compress duration is limited, and the heat exchange is fast. In addition, according to Korean Publication No. KR1020240001234A, it has no anatomical fixation system and only basic straps, and cannot be used on both knee and hip joints at the same time. For this reason, we propose a detachable hip-knee dual-mode adaptive cold compress device. Summary of the Invention

[0004] The purpose of the present invention is to provide a detachable hip and knee dual-mode adaptive cold compress device to solve the problem that the existing technology proposed in the above background technology is an integral structure, the ice bag cannot be disassembled and replaced, and it is not easy to disinfect. At the same time, the ice bag medium is water, the freezing and cold compress time is limited, the heat exchange is fast, it has no anatomical fixation system, only basic straps, and cannot be used on both knee and hip joints at the same time.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a detachable hip and knee dual-mode adaptive cold compress device, comprising an outer packaging body, wherein a clamping mechanism for quickly disassembling and assembling a phase change cold compress structure is provided in the outer packaging body;

[0006] The clamping mechanism includes a slide rail, which is arranged at the bottom of the outer packaging body, and a first side insulation plate and a second side insulation plate are symmetrically arranged on the slide rail. The first side insulation plate and the second side insulation plate are both slidably connected to the slide rail through an automatic adjustment component, and can automatically clamp and fix the two sides of the phase change cold compress structure. An external fixing component is also provided on one side of the first side insulation plate and the second side insulation plate;

[0007] Wherein, adaptive fixing mechanisms are also provided on both sides of the outer packaging body, and the adaptive fixing mechanisms include an outer fixing structure and an inner fixing structure. The outer fixing structure is used for fixing the knee joint, and the inner fixing structure is used for fixing the hip joint.

[0008] Preferably, the automatic adjustment component includes a slide seat, which is respectively arranged at the bottom of the first side insulation plate and the second side insulation plate. The slide seat is slidably arranged on the slide rail, and can move the first side insulation plate and the second side insulation.

[0009] Preferably, guide sliders are provided on both sides of the slide seat, and the guide sliders are slidably provided in the guide slots. A first spring is also provided on one side of the guide slots, and one end of the first spring is connected to the guide slider, which can provide automatic reset clamping force for the slide seat, thereby enabling the first side insulation plate and the second side insulation plate to clamp and fix the two sides of the phase change cold compress structure.

[0010] Preferably, the external fixing assembly includes a first outer splint and a second outer splint, the first outer splint is arranged at one end of the first side insulation plate, the second outer splint is arranged at one end of the second side insulation plate, an extension plate is arranged on one side surface of the first outer splint, the extension plate is movably arranged in a storage groove, and the storage groove is arranged on one side surface of the second outer splint, which can clamp and fix the outer side of the phase change cold compress structure.

[0011] Preferably, multiple groups of first NdFeB magnets are equidistantly arranged on one side surface of the extension plate, and second NdFeB magnets corresponding to the first NdFeB magnets are equidistantly arranged on one side surface of the storage groove, which can perform secondary fixation on the phase change cold compress structure and effectively prevent it from slipping.

[0012] Preferably, the phase change cold compress structure includes CoolMax quick-drying cloth, a microporous silica gel membrane is arranged in the middle of the CoolMax quick-drying cloth, a nano silver fiber grid is arranged on one side of the microporous silica gel membrane, and a phase change material core layer is arranged on the other side of the microporous silica gel membrane.

[0013] Preferably, the core layer of the phase change material is composed of dodecanol, tetradecane, medical glycerin and microencapsulated n-octadecane, which increases the cold preservation time and has high hardness after freezing, thereby increasing the cold compress time and cold compress effect.

[0014] Preferably, the outer fixing structure includes an outer flexible layer, which is arranged on one side surface of the outer packaging body. A transverse strap installation opening is also provided in the outer flexible layer, which can facilitate the installation of the leg strap and can be fixed at the patient's knee joint position.

[0015] Preferably, the inner fixing structure includes an antibacterial Lycra base layer, in which a memory alloy support bar is provided, which can automatically deform and fit tightly with the cold compress position; a longitudinal strap mounting port is provided longitudinally through the antibacterial Lycra base layer on one side of the memory alloy support bar, which can fix the patient's hip joint position.

[0016] Preferably, an openable and closable cover is provided on the upper side of the outer packaging body, and the cover is connected to the antibacterial Lycra base layer by a hinge. A sealing strip that fits the inner cavity of the outer packaging body is also provided at the bottom of the cover, and a top insulation pad corresponding to the phase change cold compress structure is also provided at the bottom of the cover. A plurality of end pressure-holding components for fixing the top of the phase change cold compress structure are also provided in the top insulation pad, and the pressure-holding component includes a support sleeve, which is provided in the cover body inside the top insulation pad, and an adjustment rod is movably provided in the support sleeve, and an upper pressure pad is provided at the end of the adjustment rod. A second spring is also provided on one side of the support sleeve, and one end of the second spring is connected to the adjustment rod, which can press and fix the end of the phase change cold compress structure, thereby further improving its fixation stability.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present application can quickly disassemble and assemble the phase-change cold compress structure, and the replacement operation of the phase-change cold compress structure is convenient, which facilitates independent disinfection of the outer packaging body. At the same time, it can fix the phase-change cold compress structure at multiple levels, and the phase-change cold compress structure will not slip during use.

[0019] (2) The phase change material of the present application is used as the core cold compress material. After being frozen, it can keep cold for a long time and has a high hardness after being frozen as a whole, thereby increasing the cold compress time of the patient's affected area and the cold compress treatment effect.

[0020] (3) This application can be fixed at the patient's knee joint or hip joint, and can meet the cold compress treatment of the knee joint or hip joint. At the same time, it can adaptively fit the affected area to ensure the cold compress effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of a half-section structure of the outer packaging body of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 It is a schematic structural diagram of the external fixing assembly in the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 6 Schematic diagram of the internal structure of the phase change cold compress structure of the present invention;

[0027] Figure 7 Schematic diagram of the structure of the outer packaging body of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the inner fixing structure in the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the present invention when the knee joint is fixed;

[0030] Figure 10 This is a schematic diagram of the structure of the present invention when the hip joint is fixed;

[0031] Figure 11 This is a schematic diagram of a half-section structure of the cover body of the present invention;

[0032] Figure 12 for Figure 11 A schematic diagram of the partially enlarged structure of the middle C part;

[0033] Figure: 1. Adaptive fixing mechanism; 2. Phase change cold compress structure; 3. Inner fixing structure; 4. Outer packaging body; 5. Horizontal strap installation port; 6. Outer flexible layer; 7. Cover body; 8. Waist strap; 11. First side insulation board; 12. Slide rail; 13. Second side insulation board; 14. First waterproof layer; 15. Outer fixing assembly; 16. Slide seat; 17. Guide slider; 18. Guide chute; 19. First spring; 21. CoolMax quick-drying cloth; 22. Nanosilver fiber grid; 23. Microporous silicone membrane; 24. Phase change material core Core layer; 31. Antibacterial Lycra base layer; 32. Silicone corrugated layer; 33. Second waterproof layer; 34. Memory alloy support bar; 35. Longitudinal strap installation port; 51. Leg strap; 71. Top insulation pad; 72. End pressure holding assembly; 73. Sealing strip; 151. First outer splint; 152. Extension plate; 153. Second outer splint; 154. First NdFeB magnet; 155. Storage slot; 156. Second NdFeB magnet; 721. Second spring; 722. Support sleeve; 723. Adjustment rod; 724. Upper pressure pad. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 3 , the present invention provides a technical solution: a detachable hip and knee dual-mode adaptive cold compress device, comprising an outer packaging body 4, wherein a clamping mechanism is provided in the outer packaging body 4;

[0036] The clamping mechanism includes a slide rail 12, which is arranged at the bottom of the outer packaging body 4. A first side insulation board 11 and a second side insulation board 13 are symmetrically arranged on the slide rail 12, which can insulate the phase change cold compress structure 2 to prevent the cold from dissipating. The first side insulation board 11 and the second side insulation board 13 are both slidably connected to the slide rail 12 through an automatic adjustment component, which can automatically clamp and fix the two sides of the phase change cold compress structure 2. An external fixing component 15 is also provided on one side of the first side insulation board 11 and the second side insulation board 13;

[0037] The automatic adjustment component includes a slide 16, which is respectively arranged at the bottom of the first side insulation board 11 and the second side insulation board 13. The slide 16 is slidably arranged on the slide rail 12, and can move the first side insulation board 11 and the second side insulation.

[0038] Guide sliders 17 are also provided on both sides of the slide 16, and the guide sliders 17 are slidably provided in the guide slots 18. A first spring 19 is also provided on one side of the guide slots 18. One end of the first spring 19 is connected to the guide slider 17, which can provide automatic reset clamping force for the slide 16, thereby enabling the first side insulation plate 11 and the second side insulation plate 13 to clamp and fix the two sides of the phase change cold compress structure 2.

[0039] First, the phase change cold compress structure 2 is frozen. After freezing, the cover body 7 is opened and the phase change cold compress structure 2 is inserted into the gap between the first side insulation board 11 and the second side insulation board 13. During the insertion of the phase change cold compress material, the first side insulation board 11 and the second side insulation board 13 are simultaneously driven to move toward each other. The first side insulation board 11 and the second side insulation board 13 drive the slide 16 to move along the slide rail 12. The movement of the slide 16 drives the guide slider 17 to move in the guide slot 18. The guide slider 17 moves to compress the first spring 19. When the phase-change cold compress structure 2 is completely inserted into the outer packaging body 4, the rebound force of the first spring 19 drives the slide 16 to reset and move, thereby causing the first side insulation plate 11 and the second side insulation plate 13 to automatically clamp and fix the two sides of the phase-change cold compress structure 2. After clamping is completed, the cover body 7 is closed and connected to the outer packaging body 4. Then, it can be fixed to the patient's knee joint or hip joint position according to the patient's cold compress treatment position for cold compress treatment. During the treatment process, the phase-change cold compress structure 2 will not slip.

[0040] When the phase-change cold compress structure 2 needs to be replaced, the cover 7 is opened, the phase-change cold compress structure 2 is taken out, and replaced with the frozen phase-change cold compress structure 2. The replacement operation is convenient and does not require overall disassembly.

[0041] See also Figure 4 as well as Figure 5 The external fixing component 15 includes a first outer splint 151 and a second outer splint 153. The first outer splint 151 is arranged at one end of the first side insulation plate 11, and the second outer splint 153 is arranged at one end of the second side insulation plate 13. An extension plate 152 is arranged on one side surface of the first outer splint 151, and the extension plate 152 is movably arranged in a receiving groove 155. The receiving groove 155 is arranged on one side surface of the second outer splint 153, which can clamp and fix the outer side of the phase change cold compress structure 2; sixteen groups of first NdFeB magnets 154 are equidistantly arranged on one side surface of the extension plate 152, and second NdFeB magnets 156 corresponding to the first NdFeB magnets 154 are equidistantly arranged on one side surface of the inner side surface of the receiving groove 155, which can perform secondary fixation on the phase change cold compress structure 2 and effectively prevent it from slipping.

[0042] When the first side insulation plate 11 and the second side insulation plate 13 move toward each other, the first side insulation plate 11 and the second side insulation plate 13 drive the first outer splint 151 and the second outer splint 153 to move, and the first outer splint 151 drives the extension plate 152 to move in the storage groove 155. At the same time, the first NdFeB magnet 154 and the second NdFeB magnet 156 attract each other under the action of the magnetic field, and can provide clamping force to the first side insulation plate 11 and the second side insulation plate 13 again, further improving the clamping stability of the phase change cold compress structure 2. At the same time, the first outer splint 151 and the second outer splint 153 limit the outside of the phase change cold compress material.

[0043] Furthermore, a first waterproof layer 14 is provided in the outer packaging body 4 to prevent condensed water from overflowing.

[0044] See also Figure 6 The phase-change cold compress structure 2 includes a CoolMax quick-drying cloth 21, a microporous silicone membrane 23 is arranged in the middle of the CoolMax quick-drying cloth 21, a nanosilver fiber grid 22 is arranged on one side of the microporous silicone membrane 23, and a phase-change material core layer 24 is arranged on the other side of the microporous silicone membrane 23; the phase-change material core layer 24 is composed of 60% dodecanol, 40% tetradecane, 5% medical glycerin and 10% microencapsulated n-octadecane, which improves the cold preservation time and has high hardness after freezing, thereby improving the cold compress time and cold compress effect.

[0045] Phase change material composition ratio table

[0046] Element Proportion Core Features Technical indicators Dodecanol 60% Basic phase change materials Phase transition point -5.2℃ Tetradecane 40% Enhanced low-temperature ductility Anti-brittle cracking temperature -15℃ Medical glycerin 5% polymer plasticizers Shore hardness reduced by 40% Microencapsulated n-octadecane 10% Long-lasting cold insulation medium Extended cooling time to 8 hours

[0047] See also Figure 7 as well as Figure 9 An adaptive fixing mechanism 1 is also provided on both sides of the outer packaging body 4. The adaptive fixing mechanism 1 includes an outer fixing structure and an inner fixing structure 3. The outer fixing structure includes an outer flexible layer 6. The outer flexible layer 6 is provided on one side surface of the outer packaging body 4. A transverse strap installation port 5 is also provided in the outer flexible layer 6, which can facilitate the installation of the leg strap 51 and can be fixed at the patient's knee joint position.

[0048] When a cold compress treatment is required for the patient's knee joint, the leg straps 51 are passed through the transverse strap mounting openings 5 ​​in sequence, and then the device is fitted to the patient's knee joint, and the two leg straps 51 are fixed to the calves and thighs on both sides of the knee joint.

[0049] See also Figure 8 as well as Figure 10 The inner fixing structure 3 includes an antibacterial Lycra base layer 31, and a memory alloy support bar 34 is set in the antibacterial Lycra base layer 31, which can automatically deform and fit tightly with the cold compress position. A longitudinal strap installation port 35 is set longitudinally through the antibacterial Lycra base layer 31 on one side of the memory alloy support bar 34, which can fix the patient's hip joint position.

[0050] When a cold compress is required on the patient's hip joint, the waist strap 8 is passed through the longitudinal strap mounting port 35, and the antibacterial Lycra base layer 31 is fitted to the patient's hip joint. At the same time, the memory alloy support bar 34 can automatically deform and fit the hip joint skin. The device is then tied to the patient's hip joint through the waist strap 8, and a cold compress treatment is performed on the hip joint.

[0051] Furthermore, a second waterproof layer 33 is provided on one side of the antibacterial Lycra base layer 31 to prevent condensed water from overflowing and contacting the patient's skin.

[0052] Furthermore, a silicone corrugated layer 32 is provided on the side of the antibacterial Lycra base layer 31 that contacts the skin, thereby improving the anti-slip property during use.

[0053] See also Figure 11 as well as Figure 12 A closable cover 7 is provided on the upper side of the outer packaging body 4, and the cover 7 is connected to the antibacterial Lycra base layer 31 by a hinge. A sealing strip 73 is also provided at the bottom of the cover 7 to fit the inner cavity of the outer packaging body 4. A top insulation pad 71 corresponding to the phase change cold compress structure 2 is also provided at the bottom of the cover 7, which can prevent the cold amount of the phase change cold compress structure 2 from overflowing from the cover 7. A plurality of end pressure holding components 72 for fixing the top of the phase change cold compress structure 2 are also provided in the top insulation pad 71. The pressure holding component includes a support sleeve 722, which is provided in the cover body 7 inside the top insulation pad 71, and an adjusting rod 723 is movably provided in the support sleeve 722. An upper pressure pad 724 is provided at the end of the adjusting rod 723. A second spring 721 is also provided on one side of the support sleeve 722, and one end of the second spring 721 is connected to the adjusting rod 723, which can press and fix the end of the phase change cold compress structure 2, further improving its fixing stability.

[0054] The cover body 7 in this device can be bonded to the end of the outer packaging body 4 by Velcro. When the cover body 7 is closed, the top insulation pad 71 fits against the top of the phase change cold compress structure 2, and the upper pressure pad 724 drives the adjustment rod 723 to move in the support sleeve 722. At the same time, the adjustment rod 723 compresses the second spring 721, and the second spring 721 provides a pressing force to the upper pressure pad 724 and presses and fixes the top of the phase change cold compress structure 2.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Detachable hip and knee dual-mode adaptive cold compress device, characterized by: It comprises an outer packaging body (4), wherein a clamping mechanism for quickly disassembling and assembling the phase-change cold compress structure (2) is provided in the outer packaging body (4); The clamping mechanism includes a slide rail (12), the slide rail (12) being arranged at the inner bottom of the outer packaging body (4), a first side insulation board (11) and a second side insulation board (13) being symmetrically arranged on the slide rail (12), the first side insulation board (11) and the second side insulation board (13) being slidably connected to the slide rail (12) via an automatic adjustment component, and an external fixing component (15) is further arranged on one side of the first side insulation board (11) and the second side insulation board (13); The phase change cold compress structure (2) comprises a CoolMax quick-drying cloth (21), a microporous silica gel membrane (23) is provided in the middle of the CoolMax quick-drying cloth (21), a nanosilver fiber grid (22) is provided on one side of the microporous silica gel membrane (23), and a phase change material core layer (24) is provided on the other side of the microporous silica gel membrane (23); The phase change material core layer (24) is composed of dodecanol, tetradecane, medical glycerin and microencapsulated n-octadecane; Wherein, adaptive fixing mechanisms (1) are further provided on both sides of the outer packaging body (4), and the adaptive fixing mechanism (1) comprises an outer fixing structure and an inner fixing structure (3), wherein the outer fixing structure is used for fixing the knee joint, and the inner fixing structure (3) is used for fixing the hip joint.

2. The detachable hip and knee dual-mode adaptive cold compress device according to claim 1, characterized in that: The automatic adjustment component comprises a slide seat (16), the slide seat (16) being respectively arranged at the bottom of the first side insulation board (11) and the second side insulation board (13), and the slide seat (16) being slidably arranged on the slide rail (12).

3. The detachable hip and knee dual-mode adaptive cold compress device according to claim 2, characterized in that: Guide sliders (17) are further provided on both sides of the slide seat (16). The guide sliders (17) are slidably provided in the guide chute (18). A first spring (19) is further provided on one side of the guide chute (18). One end of the first spring (19) is connected to the guide slider (17).

4. The detachable hip and knee dual-mode adaptive cold compress device according to claim 1, characterized in that: The external fixing assembly (15) includes a first outer splint (151) and a second outer splint (153), wherein the first outer splint (151) is arranged at one end of the first side insulation board (11), and the second outer splint (153) is arranged at one end of the second side insulation board (13), and an extension plate (152) is arranged on one side surface of the first outer splint (151), and the extension plate (152) is movably arranged in a receiving groove (155), and the receiving groove (155) is arranged on one side surface of the second outer splint (153).

5. The detachable hip and knee dual-mode adaptive cold compress device according to claim 4, characterized in that: A plurality of first NdFeB magnetic blocks (154) are equidistantly arranged on one side surface of the extension plate (152), and second NdFeB magnetic blocks (156) corresponding to the first NdFeB magnetic blocks (154) are equidistantly arranged on one side surface of the receiving slot (155).

6. The detachable hip and knee dual-mode adaptive cold compress device according to claim 1, characterized in that: The outer fixing structure comprises an outer flexible layer (6), the outer flexible layer (6) being arranged on a side surface of the outer packaging body (4), and a transverse strap installation opening (5) that is transversely penetrating is also arranged in the outer flexible layer (6).

7. The detachable hip and knee dual-mode adaptive cold compress device according to claim 1, characterized in that: The inner fixing structure (3) comprises an antibacterial Lycra base layer (31), a memory alloy support strip (34) is provided in the antibacterial Lycra base layer (31), and a longitudinal strap installation opening (35) is provided in the antibacterial Lycra base layer (31) on one side of the memory alloy support strip (34) and runs longitudinally through the antibacterial Lycra base layer (31).

8. The detachable hip and knee dual-mode adaptive cold compress device according to any one of claims 1 to 7, characterized in that: An openable cover (7) is provided on the upper side of the outer packaging body (4), and the cover (7) is connected to the antibacterial Lycra base layer (31) through a hinge. A sealing strip (73) that fits the inner cavity of the outer packaging body (4) is also provided at the bottom of the cover (7). A top insulation pad (71) corresponding to the phase change cold compress structure (2) is also provided at the bottom of the cover (7). A plurality of end pressure holding components (72) for fixing the top of the phase change cold compress structure (2) are also provided in the top insulation pad (71). The pressure holding component includes a support sleeve (722), the support sleeve (722) is provided in the cover (7) in the top insulation pad (71), an adjustment rod (723) is movably provided in the support sleeve (722), an upper pressure pad (724) is provided at the end of the adjustment rod (723), and a second spring (721) is provided on one side of the support sleeve (722), one end of the second spring (721) is connected to the adjustment rod (723).

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