External locking type catheter fixing device

Abstract

The utility model belongs to the technical field of medical instruments, and discloses an external locking type catheter fixing device which comprises a fixing part and a rotating part, a strake is arranged between the fixing part and the rotating part, and the middle of the strake keeps horizontally bent in the radial direction under the action of elasticity of the strake. A locking mechanism is arranged between the fixed part and the rotating part; a convex-concave structure is arranged on the circumferential surface of the rotating part, a spring piece is arranged on the fixed part, the spring piece abuts against the circumferential surface of the rotating part under the elastic effect, the spring piece is provided with a matching structure interacting with the convex-concave structure, and the spring piece and the convex-concave structure are combined to form the locking mechanism. The locking mechanism adopted by the utility model is not provided with an independent part and does not need to be additionally assembled, and when the rotating part is mounted on the fixed part, only the leaf spring needs to be moved to avoid the rotating part, so that the rotating part is more convenient to mount.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and relates to a technology for fixing a drainage catheter when the catheter is used on a patient, and in particular to a fixing device for the drainage catheter. Background Art

[0002] Drainage catheters are medical devices used for clinical surgical drainage. They are used to guide pus, blood, and fluids accumulated between human tissues or in body cavities to the outside of the body after surgery to prevent postoperative infection and promote wound healing. Before the advent of special fixation devices, doctors usually used adhesive tape to fix the catheters when using drainage catheters on patients, which had a worse fixation effect than special fixation devices.

[0003] The early scheme of the dedicated fixing device for the drainage catheter can be found in the Chinese patent application with the publication number CN1997414A. The self-suture fixing device for the catheter disclosed in the patent application is provided with a base for bonding and fixing with the skin, and a rotating ring is arranged on the base. One or more sutures are stored in the base and connected to the rotating ring at the same time. When the rotating ring is rotated, the rotating ring pulls the sutures from both ends to tighten and fix the catheter. The disadvantage of this device is that it can only be fixed once. When it is necessary to release the fixation to clean the wound or replace the absorbent pad, the sutures have to be cut and the device has to be scrapped. After cleaning the wound, a new device is replaced to fix the catheter.

[0004] In response to the shortcomings of the above-mentioned early catheter fixing devices, various improvements have subsequently appeared in the prior art. The latest improvement scheme can be found in the Chinese utility model patent with publication number CN209361596U. The catheter fixing device disclosed in this patent includes an annular fixing base, and the annular fixing base has glue on the bottom, which can be adhered and fixed on the skin; a groove is provided on the outer periphery of the annular fixing base, and an annular sliding ring that can rotate freely along the groove is provided on the groove; at least one flexible hoop strip is connected between the annular fixing base and the annular sliding ring; the annular sliding ring is composed of two half rings connected end to end into an integral ring shape, and is provided on the outside of the groove of the annular fixing base by a snap.

[0005] On the one hand, the improved scheme effectively solves the problem of the rotating slider being easy to fall out of the groove involved in the Chinese invention patent application with publication number CN106806974A through the overall annular structure, and the installation of the annular sliding ring on the base no longer depends on the upper cover, which is convenient for assembly. On the other hand, in order to solve the problem of how to fit the parts of the annular structure into the groove with the opening facing the side, the annular sliding ring is further designed as a combined structure composed of two half rings connected end to end into an integral whole. However, the locking mechanism of the improved scheme still adopts the structure disclosed in the Chinese invention patent application with publication number CN106806974A, which is complex in structure and inconvenient to assemble. Summary of the invention

[0006] The technical problem to be solved by the utility model is that the locking mechanism of the above-mentioned existing catheter fixing device has a complex structure and is inconvenient to assemble.

[0007] To solve the above technical problems, the utility model discloses a further improved external locking catheter fixing device, comprising a fixing part and a rotating part rotatably connected to the fixing part, wherein the device is provided with a central hole for passing the catheter along the rotation axis of the rotating part.

[0008] A hoop bar for binding the catheter is provided between the fixed part and the rotating part, two ends of the hoop bar are respectively connected to the fixed part and the rotating part, and the middle part of the hoop bar maintains radial horizontal bending under the action of its own elasticity.

[0009] A locking mechanism is provided between the fixed part and the rotating part for restricting the rotating part from rotating relative to the fixed part.

[0010] It is characterized in that the rotating part includes a radially outward circumferential surface centered on its rotation axis, and a regular convex-concave structure is provided on the circumferential surface around the circumferential surface. A spring sheet is provided on the side of the circumferential surface on the fixed part. In a natural state, the spring sheet is pressed against the circumferential surface of the rotating part under the action of elasticity, and a matching structure that interacts with the convex-concave structure is provided on the side of the spring sheet facing the circumferential surface. The spring sheet and the convex-concave structure on the circumferential surface combine to constitute the locking mechanism.

[0011] In the above scheme, the rotating part rotates relative to the fixed part, driving one end of the hoop to move around the catheter, and finally the catheter is wound and fixed or pulled and fixed in multiple directions. This scheme uses a convex-concave structure provided on the rotating part and a spring sheet provided on the fixed part to form a locking mechanism for restricting the rotating part from rotating relative to the fixed part. The convex-concave structure and the spring sheet can be injection molded with the rotating part and the fixed part respectively, without the need for additional assembly. When installing the rotating part on the fixed part, it is only necessary to move the spring sheet to avoid the rotating part, making the installation of the rotating part more convenient.

[0012] Furthermore, in the positive rotation direction of the rotating part (the rotation direction of the tightening catheter), the front end of the hoop strip is connected to the rotating part, and the rear end is connected to the fixed part. The bending direction of the hoop strip is the same as the bending direction of a section of an arc from the rear end connection point of the hoop strip along the positive rotation direction to the front end connection point. When the rotating part rotates forward, the hoop strip is further bent and approaches the center, and when the rotating part rotates reversely, the hoop strip is unfolded and retreats to the edge.

[0013] Regarding the material of the hoop strip, it can be understood that in a stationary state or when the rotating part drives one end of the hoop strip to move, the middle part of the hoop strip suspended in the air should be kept in a horizontally bent state, and the elasticity of the hoop strip should be such that the middle part of the hoop strip will not sag due to its own weight. On this basis, in order to avoid the difficulty of bending the hoop strip and to facilitate winding on the catheter, its material should be as soft as possible. Based on this, preferably, the hoop strip is made of nylon material. In addition, in order to guide the bending direction of the hoop strip, it is preferred that the two ends of the hoop strip are rotatably connected to the fixed part and the rotating part respectively, and the rotation axis is vertical.

[0014] The convex-concave structure can be formed by a plurality of convex structures evenly arranged around a circumference. Preferably, the convex-concave structure is an outer gear ring, and the matching structure on the spring sheet is a latching tooth matching the outer gear ring. Further, the outer gear ring and the latching tooth are both ratchet structures.

[0015] Preferably, an upwardly protruding mounting portion is provided around the center hole on the fixed portion, an annular groove opening radially outward is provided on the outer side of the mounting portion, and the rotating portion includes an annular sliding ring, a sliding fitting portion is provided on the inner side of the annular sliding ring, and the sliding fitting portion is slidably fitted with the annular groove.

[0016] As an option, the rotating part can be a part, the annular sliding ring is a structure arranged at the bottom of the rotating part, and the circumferential surface and the convex-concave structure arranged thereon are a structure arranged at the side of the rotating part.

[0017] As another option, the rotating part may be a component formed by combining two or more parts, and the annular sliding ring is one of the parts constituting the rotating part.

[0018] Preferably, the rotating part is composed of an annular sliding ring and an upper cover, the upper cover includes a top wall and a side wall, the center hole passes through the top wall of the upper cover, the annular sliding ring is arranged inside the upper cover, and is fixedly connected to the upper cover, and the circumferential surface of the convex and concave structure is the outer circumferential surface of the side wall of the upper cover. The functions of the upper cover include: 1. shielding the internal structure and beautifying the appearance of the product, 2. being used to operate the rotation of the rotating part relative to the base, and 3. being used to set vertical lines to achieve rotation locking.

[0019] As an option, the annular sliding ring is a circular ring formed by two half rings connected end to end by snap fasteners. This combination structure formed by two half rings connected end to end to form a circular ring can effectively solve the problem of how to install the annular sliding ring in the annular slide groove, but it also has shortcomings, including: (1) the number of parts is increased, (2) the assembly process of aligning the snap fastener structure is increased, (3) the setting of the connection structure between the two half rings makes the overall structure of the annular sliding ring complicated, and (4) the matching strength of the snap fastener between the two half rings has a negative impact on the assembly and structural stability of the sliding ring. If the matching strength is large, a larger operating force is required to insert the snap fastener head into the snap fastener port during assembly, which obviously brings difficulties to the assembly work. If the matching strength is small, when the two half rings are subjected to force, the snap fastener is easy to disengage, resulting in a significant reduction in the structural stability of the annular sliding ring.

[0020] As another option, the annular sliding ring is an open ring, and the range of elastic deformation of the open ring satisfies the requirement that the open ring can be deformed to fit into the annular sliding groove.

[0021] Compared with the circular ring formed by connecting two half rings end to end, the elastic open ring can expand radially through the opening setting, thereby achieving the purpose of inserting into the annular groove. On the basis of the advantages of the combined structure of two half rings (the annular structure is not easy to fall out of the annular groove, and the installation on the fixed part does not rely on the upper cover, which is convenient for assembly). Further, a single part is used to replace the assembly composed of two parts assembled together by a snap-on structure, thereby overcoming the structural defects of the combination of two half rings, which are mainly reflected in: (1) The structure is relatively simpler and the processing cost is reduced; (2) A single part does not require assembly and the assembly cost is reduced; (3) There is no snap-on structure, which is easy to assemble and has good structural stability.

[0022] It is understandable that the open ring relies on elasticity to maintain its circular shape, and requires a radially outward force to deform and expand it, and then it can slip out of the groove. The two half rings rely on the buckle structure to maintain their circular shape, and require a radially outward force to disengage the buckle, and then they can slip out of the groove. Therefore, when the force required for the elastic deformation of the open ring is the same as the force required for the buckle disengagement of the two half rings, the anti-slip effect of the two is basically the same.

[0023] Further, a notch is provided at the opening of the open ring. Further, the angle of the notch is less than 360 / n degrees, where n is the number of hoop strips.

[0024] Preferably, the mounting portion is a circular ring structure, the connection point of the hoop strip on the fixing portion is located at the upper end of the mounting portion, and the number of the hoop strips is at least 2. The connection points of the hoop strip on the upper end of the mounting portion are evenly distributed along the circumference. The connection points of the hoop strip on the annular sliding ring are also evenly distributed along the circumference.

[0025] Preferably, the number of the hoop strips is 3, and the bending directions of the 3 hoop strips differ by 120 degrees.

[0026] Preferably, the top of the mounting portion is evenly provided with vertical shaft holes along the circumference in the same number as the number of the hoop strips. The top of the annular sliding ring is higher than the top of the mounting portion, and the top of the annular sliding ring is evenly provided with vertical pins along the circumference in the same number as the number of the hoop strips, and a pin and a shaft hole form a pair for mounting a hoop strip. The fixed end of the hoop strip is provided with a short shaft that rotates with the shaft hole, and the moving end of the hoop strip is provided with a collar that rotates with the pin, and the axes of the short shaft and the collar are respectively perpendicular to the hoop strip.

[0027] Preferably, the fixing portion comprises a base with a main body portion in the form of a ring, and the inner side of the ring protrudes upward to form a mounting portion of an annular structure.

[0028] Furthermore, an auxiliary fixing mechanism is provided on the base at the side of the mounting portion.

[0029] Furthermore, the auxiliary fixing mechanism includes a nylon cable tie mounting seat fixed to the base and a nylon cable tie mounted on the nylon cable tie mounting seat.

[0030] Preferably, the spring sheet is arranged on a side of the nylon cable tie mounting seat facing the mounting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the principle that the rotating slider can easily escape from the groove.

[0032] Figure 2 for Figure 1 Cross-section at EE.

[0033] Figure 3 It is a schematic diagram of the principle that the ring structure is not easy to escape from the groove.

[0034] Figure 4 It is a schematic diagram showing the principle that the ring structure cannot be installed in the groove.

[0035] Figure 5 It is a schematic diagram of the principle that the open ring structure is not easy to fall out of the groove.

[0036] Figure 6 Schematic diagram of the angle of the notch set at the opening of the split ring.

[0037] Figure 7 It is a schematic diagram of the structure of the existing locking mechanism.

[0038] Figure 8 This is a structural diagram of a specific example of the catheter fixing device of the present utility model.

[0039] Fig. 9 for Figure 8 Schematic diagram of the structure of the device shown from top view (cable ties hidden).

[0040] Fig.10 for Figure 8 Exploded structural diagram of the device cover and base.

[0041] Fig.11 for Fig.10 The device shown is an exploded structural diagram of the annular sliding ring, hoop bar and base.

[0042] Fig.12 The schematic diagram is a structural diagram of the installation of an annular sliding ring formed by two half rings on a base.

[0043] Fig.13 It is a schematic diagram of the structure of an annular sliding ring formed by two half rings.

[0044] Fig.14 This is a schematic diagram of the installation structure of the annular sliding ring of the open ring structure on the base.

[0045] Fig.15 Schematic diagram of the annular sliding ring structure with an open ring structure. DETAILED DESCRIPTION

[0046] Reference Figure 1-2 , these two figures show schematic diagrams of the principle that the rotating slider can easily escape from the groove. In the figure, 1 represents a base, 111 represents an annular groove arranged on the base, and 01 represents a rotating slider that slides with the groove. In document No. CN106806974A, the rotating ring and the rotating slider are connected by a buckle structure. When the rotating ring is pried with force, the rotating ring forms an axial upward pulling force F1 on the rotating slider. The pulling force F1 acts on the outer side of the rotating slider. Since the inner side of the rotating slider is assembled in the groove, when the rotating slider has an upward movement trend, the groove will form an axial downward reverse resistance F2 on the inner side of the rotating slider. Under the joint action of the outer upward pulling force F1 and the inner reverse resistance F2, the rotating slider will flip upward on the outer side, as shown by the dotted line in the figure, which will cause the inner side of the rotating slider to escape from the groove.

[0047] Reference Figure 3 , which is a schematic diagram showing the principle that the ring structure is not easy to escape from the groove. In the figure, 1 represents the base, 02 represents the ring that slides with the groove, and the base is provided with the same annular groove, and its FF-direction cross-sectional view is the same as Figure 2The same as shown in the figure. When point a of the ring is subjected to an upward pulling force, part A tends to flip upward. Since part A is connected to part B and part D, the upward flipping movement of part A will cause part B and part D to have a downward movement trend, but the bottom of the ring is supported by the base. Therefore, part B and part D will constrain part A from flipping upward when subjected to force. Similarly, part A and part C will also constrain part B or part D from flipping upward when subjected to force. Therefore, the annular structure is not easy to fall out of the groove when subjected to axial force.

[0048] Reference Figure 4 Although the annular structure can effectively prevent it from falling out of the groove, the annular structure cannot be directly installed in the groove because the inner diameter d1 of the annular ring is smaller than the outer diameter d2 of the upper edge of the groove. In response to this problem, the solution proposed by the Chinese utility model patent with publication number CN209361596U is to design the annular ring as a combined structure formed by assembling two half rings. During installation, the two half rings are assembled together in the groove to form a ring shape. Its shortcomings have been described in the background technology and will not be repeated here. Similarly, in response to the problem that the annular structure cannot be directly installed in the groove, the solution adopted by the utility model is to design the annular ring as an open ring, such as Figure 5 As shown, the ring can be opened outwards and inserted into the groove during installation. Of course, this requires that the material selection ensures that the split ring has a certain elasticity and its elastic deformation range meets the requirements of inserting into the groove.

[0049] Reference Figure 5 In the figure, 1 represents the base, 2 represents the open ring that slides with the groove, and its GG cross-sectional view is the same as Figure 2 The same as shown. Based on the solution of the utility model, when point a' near the opening is subjected to an upward pulling force, part A' tends to flip upward. Since part A' is connected to part B', the upward flipping movement of part A' will cause part B' to have a downward movement trend, but the bottom of the open ring is supported by the base. Therefore, part B' will constrain part A' from flipping upward when subjected to force. When the open ring is subjected to an upward pulling force except for the part near the opening, its technical effect is the same as Figure 3 The closed circles shown are identical.

[0050] Reference Figure 6 The opening of the open ring 2 may be a notch structure, or may be designed as a structure with two ends staggered (e.g., staggered inside and outside, or staggered up and down). When a notch is provided at the opening of the open ring 2, the angle R of the notch is preferably less than 360 / n, where n is the number of hoop strips. Taking 3 hoop strips as an example, the angle R of the notch is preferably less than 120 degrees.

[0051] Reference Figure 7The existing locking mechanism includes a ratchet ring 52 and two lock buckles 4. The ratchet ring 52 is arranged on the inner side of the side wall of the upper cover 5. The lock buckle 4 is swingably arranged on the base 1 along the circumferential direction. A spring bow 41 is provided on the inner side of the swinging end of the lock buckle 4, and a ratchet 42 cooperating with the ratchet ring is provided on the outer side. Under the action of the spring bow 41, the ratchet 42 on the outer side of the swinging end of the lock buckle leans against the ratchet ring 52.

[0052] With this locking mechanism, not only does it require a separate injection molding of the lock buckle, but the lock buckle also requires additional assembly when assembling the catheter fixture, and the lock buckle also affects the assembly of the upper cover.

[0053] Reference Figure 8-11 The catheter fixing device shown in this group of figures is a specific embodiment designed based on the technical solution of the utility model. In this example, the catheter fixing device is composed of a base 1, an annular sliding ring 2, three hoop strips 3, and an upper cover 5, wherein the base 1 constitutes the fixing part of the utility model, and the annular sliding ring 2 and the upper cover 5 are combined to constitute the rotating part.

[0054] A nylon tie mounting seat 101 is provided on one side of the base 1, and two nylon tie straps 6 are installed side by side in the nylon tie mounting seat 101. The main body of the base is provided with an upwardly protruding annular mounting portion 11 along the central circular hole, and an annular sliding groove 111 is provided on the outer side of the annular mounting portion 11. Three vertical shaft holes 113 for installing hoop strips are evenly arranged on the top of the annular mounting portion 11 along the circumference.

[0055] The annular sliding ring 2 is installed on the outside of the annular mounting portion 11. The inner side of the annular sliding ring 2 is a sliding fitting portion 21 whose thickness is less than the width of the annular slide groove 111. The sliding fitting portion 21 of the annular sliding ring is assembled in the annular slide groove 111 and slides with it. The outer top of the annular sliding ring 2 is higher than the top of the annular mounting portion 11. Three vertical pins 22 for mounting the hoop strip are evenly arranged along the circumference of the top of the annular sliding ring 2. A pin 22 forms a pair with an axial hole 113 for mounting a hoop strip 3. The fixed end of the hoop strip is provided with a short shaft 31 that rotates with the axial hole 113, and the moving end of the hoop strip is provided with a collar 32 that rotates with the pin 22. The axes of the short shaft 31 and the collar 32 are respectively perpendicular to the hoop strip 2.

[0056] The upper cover 5 is an inverted bowl-shaped structure, with a circular hole at the center of the top, which is aligned with the central circular hole of the base.

[0057] The top of the annular sliding ring 2 is evenly provided with four insertion holes 23 for connecting with the upper cover 5 along the circumference, and the inner side of the top of the upper cover is evenly provided with four plugs 53 corresponding to the insertion holes 23 along the circumference. The upper cover 5 is fixedly connected by the interference fit of the plugs 53 thereon and the insertion holes 23 on the open ring 2.

[0058] The outer side of the upper cover is provided with an outer gear ring 51, which is a ratchet structure. The nylon tie mounting seat 101 is provided with a spring sheet 7 on the side facing the upper cover, and the spring sheet 7 is provided with a ratchet structure engaging with the outer gear ring on the side facing the upper cover.

[0059] Reference Figure 12-15 To realize the installation of the annular sliding ring on the annular sliding groove 111, the annular sliding ring can be formed of two half rings 201 and 202 whose ends can be connected by buckles, such as Fig.12 , 13 During assembly, the two half rings 201 and 202 are respectively inserted into the annular groove from both sides, and the ends of the two half rings are aligned in pairs, and then the buckles at the ends of the half rings are buckled together to form a circular ring.

[0060] Split rings can also be used, such as Fig.14 , 15 As shown. Preferably, a notch 24 is provided at the opening of the open ring. During assembly, the open ring is stretched open within the elastic deformation range and inserted into the annular slide groove. The two ends of the opening of the open ring can also be provided as follows Fig.13 When assembling the buckle structure shown, after the open ring is inserted into the annular slide groove, pressure is applied to both sides of the opening to buckle the buckles together.

Claims

1. An external locking catheter fixing device, comprising a fixing part and a rotating part rotatably connected to the fixing part, wherein the device is provided with a central hole for passing the catheter along the rotation axis of the rotating part; a hoop bar for binding the catheter is provided between the fixing part and the rotating part, wherein the two ends of the hoop bar are respectively connected to the fixing part and the rotating part, and the middle part of the hoop bar maintains radial horizontal bending under the action of its own elasticity; a locking mechanism for restricting the rotating part from rotating relative to the fixing part is provided between the fixing part and the rotating part; It is characterized in that The rotating part includes a radially outward circumferential surface centered on its rotation axis, and a regular convex-concave structure is provided on the circumferential surface around the circumferential surface. A spring sheet is provided on the fixed part on the side of the circumferential surface. In a natural state, the spring sheet presses against the circumferential surface of the rotating part under the action of elasticity. A matching structure that interacts with the convex-concave structure is provided on the side of the spring sheet facing the circumferential surface. The spring sheet and the convex-concave structure on the circumferential surface combine to form the locking mechanism.

2. The external locking catheter fixing device according to claim 1, characterized in that: In the positive rotation direction of the rotating part, the front end of the hoop is connected to the rotating part, and the rear end is connected to the fixed part; the bending direction of the hoop is the same as the bending direction of a section of arc from the rear end connection point of the hoop to the front end connection point along the positive rotation direction; when the rotating part rotates forward, the hoop is further bent and approaches the center, and when the rotating part rotates reversely, the hoop unfolds and retreats to the edge.

3. The external locking catheter fixing device according to claim 1, characterized in that: The two ends of the hoop strip are rotatably connected to the fixing part and the rotating part respectively, and the rotation axis is vertical.

4. The external locking catheter fixing device according to claim 1, characterized in that: The convex-concave structure is an outer gear ring, and the matching structure on the spring sheet is a latching tooth matching the outer gear ring.

5. The external locking catheter fixing device according to claim 1, characterized in that: An upwardly protruding mounting portion is provided on the fixed portion around the central hole, an annular sliding groove with an opening radially outward is provided on the outer side of the mounting portion, and the rotating portion includes an annular sliding ring, a sliding fitting portion is provided on the inner side of the annular sliding ring, and the sliding fitting portion is slidably fitted with the annular sliding groove.

6. The external locking catheter fixing device according to claim 5, characterized in that: The rotating part is composed of an annular sliding ring and an upper cover, the upper cover includes a top wall and a side wall, the center hole passes through the top wall of the upper cover, the annular sliding ring is arranged in the upper cover and is fixedly connected to the upper cover, and the circumferential surface on which the convex and concave structure is arranged is the outer circumferential surface of the side wall of the upper cover.

7. The external locking catheter fixing device according to claim 5, characterized in that: The annular sliding ring is a circular ring formed by two half rings connected end to end by buckles.

8. The external locking catheter fixing device according to claim 5, characterized in that: The annular sliding ring is an open ring, and the range of elastic deformation of the open ring satisfies the requirement that the open ring can be deformed to fit into the annular sliding groove.

9. The external locking catheter fixing device according to claim 5, characterized in that: The mounting portion is a circular ring structure, and vertical axial holes are evenly arranged on the top of the mounting portion along the circumference, the same number as the number of hoop strips, the top of the annular sliding ring is higher than the top of the mounting portion, and vertical pins are evenly arranged on the top of the annular sliding ring along the circumference, the same number as the number of hoop strips, a pin and an axial hole form a pair for mounting a hoop strip, the fixed end of the hoop strip is provided with a short shaft that rotates with the axial hole, and the moving end of the hoop strip is provided with a ring that rotates with the pin, and the axes of the short shaft and the ring are respectively perpendicular to the hoop strip.

10. The external locking catheter fixing device according to claim 5, characterized in that: The fixing part includes a base with a ring-shaped main body, and the inner side of the ring bulges upward to form a mounting part with a ring-shaped structure. An auxiliary fixing mechanism is provided on the base at the side of the mounting part. The auxiliary fixing mechanism includes a nylon cable tie mounting seat fixed to the base and a nylon cable tie mounted on the nylon cable tie mounting seat. The spring sheet is arranged on the side of the nylon cable tie mounting seat facing the mounting part.

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