Dissolving treatment device for foot tophus of gout patient

Abstract

The invention belongs to the technical field of medical equipment, and discloses a dissolution treatment device for foot gouty stones of gout patients, the dissolution treatment device comprises a seat plate, the outer wall of the seat plate is provided with a placing plate through an adjusting mechanism, the outer wall of the top end of the placing plate is fixedly connected with a treatment box, and the outer wall of the placing plate is provided with a winding mechanism. A lifting mechanism is arranged on the outer wall of the bottom end of the seat plate; the lifting mechanism comprises a moving block, the inner wall of the moving block is elastically connected with a wedge block through a connecting spring, and the inner wall of the moving block is slidably connected with a trapezoidal block; through cooperation of structures such as the moving block and the support, the moving block and the seat plate can integrally move up and down by pressing the trapezoidal block, and the position of the moving block is fixed by clamping the wedge block and the clamping groove, so that the height of the seat plate can be adjusted, the adaptability is higher, the operation is more convenient, adjustment can be performed without rotating a bolt, and the practicability is higher. Time and labor are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment, and in particular relates to a device for dissolving tophi on the feet of gout patients. Background Art

[0002] The treatment devices for tophi on the feet of gout patients mainly include extracorporeal shock wave lithotripsy, which can break up tophi and facilitate their subsequent excretion; there are also some physical therapy devices, such as ultrasonic therapy instruments, which promote the decomposition and absorption of tophi by improving local blood circulation; in addition, some negative pressure suction devices can help remove broken tophi fragments, but these devices are usually auxiliary treatment methods, and drug treatment is still the basis.

[0003] When the patient undergoes the tophi dissolving treatment operation on the foot, the patient needs to sit on a bed or a chair, and then place his legs on the treatment device, and the treatment device is used to dissolve the tophi on the foot. Since the heights of the beds or chairs sat on by the patients are different, the supporting legs of the treatment device can be telescopically adjusted to ensure that the patient's legs can be placed just on the device. In some existing technologies, when adjusting the height of the equipment, it is necessary to release the telescopic part of the supporting leg by turning the bolts multiple times before it can be adjusted up and down. After the adjustment is completed, the bolts still need to be turned to fix the height of the supporting leg. This operation is relatively cumbersome, time-consuming and labor-intensive. Therefore, in view of the above problems, a device for dissolving tophi on the feet of gout patients is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a device for dissolving tophi on the feet of gout patients, which solves the problem that it is inconvenient to adjust the height of the treatment equipment in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for dissolving tophi on the feet of gout patients, comprising a seat plate, the outer wall of the seat plate is provided with a placement plate through an adjustment mechanism, the top outer wall of the placement plate is fixedly connected to a treatment box, the outer wall of the placement plate is provided with a winding mechanism, and the bottom outer wall of the seat plate is provided with a lifting mechanism;

[0006] The lifting mechanism includes a moving block, the inner wall of the moving block is elastically connected to a wedge block through a connecting spring, the inner wall of the moving block is slidably connected to a trapezoidal block, the inner wall of the moving block is slidably connected to a moving rod, the outer wall of the moving block is slidably connected to a bracket, and the outer wall of the bracket is provided with a card slot.

[0007] Preferably, the moving block is fixedly connected to the outer wall of the bottom end of the seat plate, and the wedge block is engaged with the slot.

[0008] Preferably, one end of the connecting spring is fixedly connected to the wedge block, the other end of the connecting spring is fixedly connected to the inner wall of the moving block, and the wedge block is slidably connected to the inner wall of the moving block.

[0009] Preferably, one end of the moving rod is slidably connected to the outer wall of the trapezoidal block, and the other end of the moving rod is fixedly connected to the outer wall of the wedge block.

[0010] Preferably, the adjustment mechanism includes a pull rod, which is elastically connected to the inner wall of the placement plate through a telescopic spring, a protrusion is fixedly connected to the outer wall of the pull rod, a circular groove is provided on the inner wall of the placement plate, and a groove is provided on the inner wall of the placement plate.

[0011] Preferably, the pull rod is slidably connected to the inner wall of the placement plate, one end of the telescopic spring is fixedly connected to the outer wall of the pull rod, and the other end of the telescopic spring is fixedly connected to the inner wall of the placement plate.

[0012] Preferably, the protrusion is engaged with the groove, and the placement plate is rotatably connected to the seat plate.

[0013] Preferably, the winding mechanism includes a winding drum, the inner wall of the winding drum is elastically connected to the rotating shaft through a spiral spring, the inner wall of the winding drum is fixedly connected to a partition, the outer wall of the rotating shaft is provided with a limiting groove, the outer wall of the winding drum is fixedly connected to a fixed block, the inner wall of the fixed block is elastically connected to the limiting block through a return spring, and a strap is wrapped around the outer wall of the rotating shaft.

[0014] Preferably, the winding drum is fixedly connected to the outer wall of the placement plate, one end of the spiral spring is fixedly connected to the outer wall of the rotating shaft, the other end of the spiral spring is fixedly connected to the inner wall of the winding drum, and the rotating shaft is rotatably connected to the inner wall of the winding drum.

[0015] Preferably, one end of the return spring is fixedly connected to the outer wall of the limit block, the other end of the return spring is fixedly connected to the inner wall of the fixed block, the limit block is slidably connected to the inner wall of the fixed block, and the limit block is clamped in the limit groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention cooperates with structures such as a moving block and a bracket, and by pressing the trapezoidal block, the wedge block can be moved toward the inner wall of the moving block, thereby releasing the fixation of the moving block and the bracket, and the moving block and the seat plate can be moved up and down as a whole, and the position of the moving block is fixed by the wedge block and the card slot, so that the height of the seat plate can be adjusted, which has higher adaptability and is more convenient to operate. It does not need to be adjusted by turning the bolt, which saves time and effort.

[0018] The present invention provides a pull rod and a convex block and other structures to cooperate, and by pulling the pull rod to make the convex block disengage from the groove, the limit of the placement plate can be released to flip it over. When the patient's thigh is placed on the seat plate and the calf is on the placement plate, the posture of the thigh and the calf can be adjusted according to the patient's needs, thereby improving the comfort of the patient during the treatment of tophi on the foot.

[0019] The present invention cooperates with structures such as a rotating shaft and a strap, so that the shifting block on the outer wall of the limit block can be moved to make the limit block disengage from the limit groove and the strap can be pulled outward. The patient's legs can be placed under the strap, and the spiral spring can drive the rotating shaft to rotate in the opposite direction to make the strap fit the patient's legs and bind the patient's legs, so as to prevent the legs from moving during the treatment of dissolving tophi on the foot, which may affect the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the moving block and the bracket of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the placement plate and the seat plate after cross-section decomposition of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged structural diagram of part A in the middle;

[0024] Figure 5 It is a cross section of the winding drum and a schematic diagram of the treatment box structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the winding drum of the present invention.

[0026] In the figure: 1. seat plate; 2. lifting mechanism; 201. moving block; 202. bracket; 203. slot; 204. trapezoidal block; 205. moving rod; 206. connecting spring; 207. wedge block; 3. adjusting mechanism; 301. pull rod; 302. telescopic spring; 303. protrusion; 304. groove; 305. circular groove; 4. placing plate; 5. winding mechanism; 501. winding drum; 502. volute spring; 503. rotating shaft; 504. partition; 505. limiting slot; 506. fixing block; 507. reset spring; 508. limiting block; 509. strap; 6. treatment box. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 6 As shown, the present invention provides a device for dissolving and treating tophi on the feet of gout patients, comprising a seat plate 1, an outer wall of the seat plate 1 is provided with a placement plate 4 through an adjustment mechanism 3, the top outer wall of the placement plate 4 is fixedly connected with a treatment box 6, the outer wall of the placement plate 4 is provided with a winding mechanism 5, and the bottom outer wall of the seat plate 1 is provided with a lifting mechanism 2; the lifting mechanism 2 comprises a moving block 201, the inner wall of the moving block 201 is elastically connected with a wedge block 207 through a connecting spring 206, the inner wall of the moving block 201 is slidably connected with a trapezoidal block 204, the inner wall of the moving block 201 is slidably connected with a moving rod 205, the outer wall of the moving block 201 is slidably connected with a bracket 202, and the outer wall of the bracket 202 is provided with a card slot 203.

[0029] The above scheme is adopted: when using the device, the gout patient can sit on a bed or a chair, place the thigh on the seat plate 1, place the calf on the placement plate 4, and then place the foot in the treatment box 6. The treatment box 6 is a prior art and can dissolve the tophi on the patient's foot; the setting of the lifting mechanism 2 can adjust the height of the seat plate 1, so that the patient can also place his legs on the device when sitting on a bed or chair of different heights; the moving block 201 can slide up and down in the inner wall of the bracket 202, so as to adjust the height of the seat plate 1, and the arc surface of the wedge block 207 remains in an upward state. Under normal circumstances, the straight surface of the wedge block 207 is released from the inner wall of the slot 203, so that the moving block 201 can be limited to fix the height of the seat plate 1; when the seat plate 1 needs to be raised, the seat plate 1 can be pulled upward, and the wedge block 207 will move toward the inner wall of the moving block 201 due to the compression of the arc surface by the inner wall of the slot 203, so that the seat plate 1 can be directly raised.

[0030] like Figure 2 As shown, the moving block 201 is fixedly connected to the outer wall of the bottom end of the seat plate 1, and the wedge block 207 is engaged with the slot 203; one end of the connecting spring 206 is fixedly connected to the wedge block 207, and the other end of the connecting spring 206 is fixedly connected to the inner wall of the moving block 201, and the wedge block 207 is slidably connected to the inner wall of the moving block 201; one end of the moving rod 205 is slidably connected to the outer wall of the trapezoidal block 204, and the other end of the moving rod 205 is fixedly connected to the outer wall of the wedge block 207.

[0031] The above scheme is adopted: when not affected by external forces, the two groups of moving rods 205 are always in contact with the short side inclined surfaces of the trapezoidal block 204. When the operator presses the trapezoidal block 204 upward, the inclined surfaces of the trapezoidal block 204 will squeeze the two groups of moving rods 205. Since the moving rods 205 can only move horizontally in the inner wall of the moving block 201, the two groups of moving rods 205 can drive the corresponding wedge blocks 207 to move to both sides at the same time. At this time, the wedge blocks 207 can be disengaged from the slots 203, compressing the connecting springs 206, and can contact the limit of the moving block 201 to move it downward, so that the seat plate 1 can be lowered; when the seat plate 1 is adjusted to a suitable height, the connecting springs 206 will drive the wedge blocks 207 to pop outward due to their own elastic force and engage with the corresponding slots 203, and the moving block 201 will be limited again to be fixed in the bracket 202, so that the height adjustment can be completed conveniently and quickly.

[0032] like Figure 3 and Figure 4 As shown, the adjustment mechanism 3 includes a pull rod 301, which is elastically connected to the inner wall of the placement plate 4 through a telescopic spring 302, and a protrusion 303 is fixedly connected to the outer wall of the pull rod 301. A circular groove 305 is provided on the inner wall of the placement plate 4, and a groove 304 is provided on the inner wall of the placement plate 4. The pull rod 301 is slidingly connected to the inner wall of the placement plate 4, one end of the telescopic spring 302 is fixedly connected to the outer wall of the pull rod 301, and the other end of the telescopic spring 302 is fixedly connected to the inner wall of the placement plate 4. The protrusion 303 is clamped with the groove 304, and the placement plate 4 is rotatably connected to the seat plate 1.

[0033] The above scheme is adopted: through the setting of the adjustment mechanism 3, the angle between the placement plate 4 and the seat plate 1 can be adjusted, so that the patient's thigh and calf can be in a more comfortable posture, thereby improving the comfort of the patient during the treatment of tophi dissolution of the foot; when not affected by external force, the telescopic spring 302 causes the pull rod 301 to be inserted into the inner wall of the circular groove 305 due to its own elastic force, and the protrusion 303 is engaged with a group of grooves 304, at this time, the placement plate 4 and the seat plate 1 can be fixed and limited; when adjusting the angle according to the patient's needs, the operator can pull the pull rod 301 outward to disengage the protrusion 303 from the groove 304 and place it in the circular groove 305, and the placement plate 4 can be turned upside down to adjust the angle between it and the seat plate 1; after the adjustment is completed, the pull rod 301 can be released, and it is again plugged into the circular groove 305 under the elastic force of the telescopic spring 302, and the protrusion 303 is engaged with another group of grooves 304, and the adjustment of the angle of the placement plate 4 can be completed.

[0034] like Figure 5 and Figure 6As shown, the winding mechanism 5 includes a winding drum 501, the inner wall of the winding drum 501 is elastically connected to the rotating shaft 503 through a spiral spring 502, the inner wall of the winding drum 501 is fixedly connected to a partition plate 504, the outer wall of the rotating shaft 503 is provided with a limiting groove 505, the outer wall of the winding drum 501 is fixedly connected to a fixing block 506, the inner wall of the fixing block 506 is elastically connected to the limiting block 508 through a return spring 507, and the outer wall of the rotating shaft 503 is wound with a binding belt 509; the winding drum 501 is fixedly connected to the placing drum 501. The outer wall of the mounting plate 4, one end of the spiral spring 502 is fixedly connected to the outer wall of the rotating shaft 503, the other end of the spiral spring 502 is fixedly connected to the inner wall of the winding drum 501, and the rotating shaft 503 is rotatably connected to the inner wall of the winding drum 501; one end of the return spring 507 is fixedly connected to the outer wall of the limit block 508, the other end of the return spring 507 is fixedly connected to the inner wall of the fixed block 506, the limit block 508 is slidably connected to the inner wall of the fixed block 506, and the limit block 508 is clamped with the limit groove 505.

[0035] The above scheme is adopted: one end of the strap 509 is fixed on the rotating shaft 503, and the other end is fixed on the placement plate 4. The strap 509 can bind the patient's calf to prevent the leg from moving during the treatment process, which will affect the treatment effect of tophi on the foot; due to the different thickness of the patient's legs, it is necessary to adjust the length of the strap 509 so that it can firmly bind the patient's legs; under normal conditions, the limit block 508 is always engaged with a set of limit grooves 505, which will limit the rotating shaft 503. In this state, the length of the strap 509 is fixed; the outer wall of the limit block 508 is provided with a shifting block, which can be moved to disengage the limit block 508 from the limit groove 505 and contact the rotating shaft 50 3, in this state, pulling the strap 509 can rotate the shaft 503, causing the spiral spring 502 to contract under force; after the strap 509 is stretched, the foot can be inserted into the treatment box 6, and the leg is under the strap 509. At this time, the strap 509 can be loosened, and under the elastic force of the spiral spring 502, the shaft 503 will be driven to rotate in the opposite direction, and the strap 509 will be rolled up to the inner wall of the winding drum 501; when the strap 509 is rolled up to fit and fix with the patient's leg, the limit block 508 will pop out under the elastic force of the reset spring 507 and be clamped on a set of limit grooves 505 on the shaft 503, thereby limiting the shaft 503, and then the fixation of the patient's leg can be completed more conveniently.

[0036] The working principle and use process of the present invention:

[0037] First, when the gout patient is ready to use the device, he can sit on a bed or a chair and adjust the height of the seat plate 1 according to the height of the bed or chair he is on; in normal conditions, the wedge block 207 is located in the moving block 201, and is elastically connected to the inner wall of the moving block 201 through the connecting spring 206, with the arc surface facing upward, and the straight surface of the wedge block 207 is engaged with the inner wall of the slot 203 on the outer wall of the bracket 202, limiting the position of the moving block 201 and fixing the height of the seat plate 1; if the seat plate 1 needs to be raised, the seat plate 1 can be pulled upward to keep the bracket 202 fixed, and at this time, the arc surface of the wedge block 207 is squeezed by the inner wall of the slot 203 to move toward the moving block 201. The inner wall of the movable block 201 moves, and the seat plate 1 can be directly raised. If the seat plate 1 needs to be lowered, the operator can press the trapezoidal block 204 upwards. The inclined surface of the trapezoidal block 204 squeezes the two sets of movable rods 205 that slide laterally on the inner wall of the movable block 201. The movable rods 205 drive the wedge blocks 207 to move to both sides. The wedge blocks 207 are out of contact with the slots 203, compressing the connecting springs 206, releasing the limit of the movable block 201, and the seat plate 1 can be lowered. After adjusting to the appropriate height, the elastic force of the connecting springs 206 causes the wedge blocks 207 to pop out and engage with the slots 203, and fix the seat plate 1 again. The adjustment process is relatively convenient and quick.

[0038] Next, the patient can place the thigh on the seat plate 1 with the height adjusted, and the calf on the placement plate 4. The angle between the placement plate 4 and the seat plate 1 can be adjusted by the adjustment mechanism 3 to make the patient's leg posture more comfortable. Under normal circumstances, the telescopic spring 302 allows the pull rod 301 to be inserted into the circular groove 305 on the inner wall of the placement plate 4, and the protrusion 303 on the pull rod 301 is engaged with a group of grooves 304 to fix the angle between the placement plate 4 and the seat plate 1. If it is necessary to adjust according to the patient's needs, the operator can pull the pull rod 3 outwards to adjust the angle. 01, the protrusion 303 disengages from the groove 304 and enters the circular groove 305, releasing the limit of the placement plate 4, so that the placement plate 4 can be flipped up and down, thereby adjusting the angle between the placement plate 4 and the seat plate 1; after the adjustment is completed, the pull rod 301 is released, and the telescopic spring 302 allows the pull rod 301 to be inserted into the circular groove 305 again, and the protrusion 303 is engaged with another set of grooves 304 to fix the new angle, so that the patient's calf can be placed in a more comfortable position, thereby improving the patient's comfort during the treatment of tophi dissolution.

[0039] Then, in order to prevent the patient's legs from moving during the treatment and affecting the therapeutic effect, a winding mechanism 5 is provided on the outer wall of the placement plate 4, and the patient's legs can be fixed by the strap 509; under normal conditions, the spiral spring 502 in the winding drum 501 keeps the rotating shaft 503 in a certain state, and the return spring 507 in the fixing block 506 makes the limit block 508 engage with a group of limit grooves 505 on the outer wall of the rotating shaft 503 to limit the rotation of the rotating shaft 503; due to the different thickness of the patient's legs, when adjusting the length of the strap 509 according to the thickness of the patient's legs, the block on the limit block 508 can be first moved to make it disengage from the limit groove 505, and then the strap 509 can be pulled, and the strap 5 09 will drive the rotating shaft 503 to rotate, and the spiral spring 502 will contract; after the strap 509 is stretched, the patient can extend the foot into the treatment box 6, and the leg is under the strap 509, and then loosen the strap 509, the spiral spring 502 drives the rotating shaft 503 to rotate in the opposite direction, and reel in the strap 509, so that the strap 509 fits the patient's leg and can fix the leg; at this time, the reset spring 507 causes the limit block 508 to pop out and engage with the corresponding set of limit grooves 505, fix the rotating shaft 503, and complete the leg fixation; after completion, the treatment box 6 can be used to dissolve the tophi on the patient's foot. The treatment box 6 is a prior art and will not be repeated here.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for dissolving tophi on the feet of gout patients, comprising a seat plate (1), characterized in that: The outer wall of the seat plate (1) is provided with a placement plate (4) through an adjustment mechanism (3); the top outer wall of the placement plate (4) is fixedly connected to a treatment box (6); the outer wall of the placement plate (4) is provided with a reeling mechanism (5); and the bottom outer wall of the seat plate (1) is provided with a lifting mechanism (2); The lifting mechanism (2) comprises a moving block (201), the inner wall of the moving block (201) is elastically connected to a wedge block (207) via a connecting spring (206), the inner wall of the moving block (201) is slidably connected to a trapezoidal block (204), the inner wall of the moving block (201) is slidably connected to a moving rod (205), the outer wall of the moving block (201) is slidably connected to a bracket (202), and the outer wall of the bracket (202) is provided with a card slot (203).

2. The device for dissolving tophi on the feet of gout patients according to claim 1, characterized in that: The moving block (201) is fixedly connected to the outer wall of the bottom end of the seat plate (1), and the wedge block (207) is engaged with the engagement groove (203).

3. The device for dissolving tophi on the feet of gout patients according to claim 1, characterized in that: One end of the connecting spring (206) is fixedly connected to the wedge block (207), the other end of the connecting spring (206) is fixedly connected to the inner wall of the moving block (201), and the wedge block (207) is slidably connected to the inner wall of the moving block (201).

4. The device for dissolving tophi on the feet of gout patients according to claim 1, characterized in that: One end of the moving rod (205) is slidably connected to the outer wall of the trapezoidal block (204), and the other end of the moving rod (205) is fixedly connected to the outer wall of the wedge block (207).

5. The device for dissolving tophi on the feet of gout patients according to claim 1, characterized in that: The adjustment mechanism (3) comprises a pull rod (301), wherein the pull rod (301) is elastically connected to the inner wall of the placement plate (4) via a telescopic spring (302), a protrusion (303) is fixedly connected to the outer wall of the pull rod (301), a circular groove (305) is provided on the inner wall of the placement plate (4), and a groove (304) is provided on the inner wall of the placement plate (4).

6. The device for dissolving tophi on the feet of gout patients according to claim 5, characterized in that: The pull rod (301) is slidably connected to the inner wall of the placement plate (4), one end of the telescopic spring (302) is fixedly connected to the outer wall of the pull rod (301), and the other end of the telescopic spring (302) is fixedly connected to the inner wall of the placement plate (4).

7. The device for dissolving tophi on the feet of gout patients according to claim 5, characterized in that: The protrusion (303) is engaged with the groove (304), and the placement plate (4) is rotatably connected to the seat plate (1).

8. The device for dissolving tophi on the feet of gout patients according to claim 1, characterized in that: The winding mechanism (5) comprises a winding drum (501), the inner wall of the winding drum (501) being elastically connected to a rotating shaft (503) via a spiral spring (502), the inner wall of the winding drum (501) being fixedly connected to a partition plate (504), the outer wall of the rotating shaft (503) being provided with a limiting groove (505), the outer wall of the winding drum (501) being fixedly connected to a fixing block (506), the inner wall of the fixing block (506) being elastically connected to a limiting block (508) via a return spring (507), and a binding belt (509) being wound around the outer wall of the rotating shaft (503).

9. The device for dissolving tophi on the feet of gout patients according to claim 8, characterized in that: The winding drum (501) is fixedly connected to the outer wall of the placement plate (4), one end of the spiral spring (502) is fixedly connected to the outer wall of the rotating shaft (503), the other end of the spiral spring (502) is fixedly connected to the inner wall of the winding drum (501), and the rotating shaft (503) is rotatably connected to the inner wall of the winding drum (501).

10. The device for dissolving tophi on the feet of gout patients according to claim 8, characterized in that: One end of the return spring (507) is fixedly connected to the outer wall of the limit block (508), and the other end of the return spring (507) is fixedly connected to the inner wall of the fixed block (506). The limit block (508) is slidably connected to the inner wall of the fixed block (506), and the limit block (508) is snap-fitted to the limit groove (505).

Images