A dose bidirectional adjustment assembly for an injection device

Abstract

The utility model discloses an injection device dose two -way adjusting assembly, the utility model provides an injection device dose two -way adjusting assembly, including main shaft, the main shaft rotation is established in the pen body, is provided with the clutch on the main shaft, when the forward dose adjustment, the cantilever of clutch is stuck on the ratchet wheel of pen body, and the main shaft reverse rotation is limited, when the reverse dose adjustment, the cantilever is extruded to the clutch, makes the cantilever and ratchet wheel and removes the restriction to the main shaft reverse rotation and are released. The utility model discloses injection device dose two -way adjusting assembly, sets up the clutch on the main shaft, and the cantilever of clutch and ratchet wheel joint, and the main shaft reverse rotation is limited when forward dose adjustment, when dose adjustment exceeds the dose of expected injection, and reverse rotation dose knob, and the cantilever is extruded to the clutch and makes it and ratchet wheel and removes the restriction to the main shaft reverse rotation and are released and realize reverse dose adjustment, improve the experience feeling of patient use, also can reduce the waste caused by dose and not back call.

Description

Technical Field

[0001] This utility model relates to the field of injection device technology, and more specifically, to a bidirectional dose adjustment component for injection devices. Background Technology

[0002] An injection pen, also known as a pen-type injection device, is a medical device that combines a drug and an injection device into one. Injection pens are widely used in the treatment of various chronic diseases, such as insulin therapy for diabetes, growth hormone therapy, osteoporosis treatment, multiple sclerosis treatment, anemia treatment, and rheumatoid arthritis.

[0003] Patent document CN118436884B discloses an automatic injection pen, including a housing, a loading assembly for loading medication, a pushing assembly for administering medication under the control of a control assembly, a control assembly knob that rotates around the axis of the housing and allows for pressing actions in the axial direction, and a control module for receiving the rotation and pressing signals; wherein, the control assembly has a rotating part disposed on the outer side of the housing and a fixed part disposed on the inner side opposite to the rotating part; the rotating part has a body and an engaging part, the engaging part being non-fixedly connected to the body, and the inner wall of the fixed part has a plurality of engaging parts disposed around the axis, any one of the plurality of engaging parts engaging with the engaging part; at least one end of the engaging part and the corresponding end of the engaging part along the length direction have a distance for relative movement between the rotating part and the fixed part when the pressing action is performed. The technical solution in the above patent document lacks a dose adjustment function; if the predetermined injection dose is exceeded when the dose is set, the dose cannot be adjusted back, resulting in a poor user experience and wasted medication.

[0004] Therefore, it is necessary to propose a bidirectional dose adjustment component for injection devices to solve the problems existing in the prior art. Utility Model Content

[0005] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To address the aforementioned issues, this invention provides a bidirectional dosage adjustment component for an injection device, comprising a main shaft rotatably mounted within the pen body, and a clutch mounted on the main shaft. During forward dosage adjustment, the clutch's cantilever engages with a ratchet on the pen body, restricting the main shaft from reversing. During reverse dosage adjustment, the clutch compresses the cantilever, disengaging it from the ratchet and releasing the restriction on the main shaft's reversal.

[0007] Preferably, the ratchet is located at the lower part of the pen body, and the clutch includes a clutch sleeve located at the lower end of the main shaft. A locking member is rotatably arranged inside the clutch sleeve, and a cantilever is arranged on the outer wall of the locking member. The cantilever engages with the ratchet.

[0008] Preferably, a squeezing part is provided at the lower end of the clutch sleeve, which squeezes the cantilever during reverse dosage adjustment, causing the cantilever to disengage from the ratchet.

[0009] Preferably, a groove is provided at the lower end of the clutch sleeve, and a locking block is fixedly provided on the outer circumference of the locking member, and the locking block is movable within the groove;

[0010] The width of the card slot is greater than the width of the card block.

[0011] Preferably, the clutch sleeve is connected to the main shaft drive, and multiple protrusions are arranged in an array along the circumferential direction on the inner wall of the clutch sleeve. Multiple insertion blocks corresponding to the protrusions are arranged in an array on the outer circumference of the lower end of the main shaft, and the insertion blocks and protrusions are inserted into each other.

[0012] In addition, this utility model also provides a bidirectional dosage adjustment component for an injection device, including a main shaft, which is rotatably disposed inside the pen body. A clutch is disposed on the main shaft. During forward dosage adjustment, the second cantilever of the clutch is engaged with a ratchet on the pen body or a pen body connector, restricting the main shaft from reversing. During reverse dosage adjustment, the clutch squeezes the second cantilever, causing the second cantilever to disengage from the ratchet and releasing the restriction on the reversal of the main shaft.

[0013] Preferably, the ratchet is located on the upper part of the pen body, and the clutch includes a connector located on the upper part of the main shaft. The connector includes a connector body, and the second cantilever is located on the outer circumference of the connector body. The suspended end of the second cantilever is engaged with the ratchet.

[0014] The connector is circumferentially fixed to the main shaft, and the connector is rotatably set inside the dosage knob.

[0015] Preferably, at least one longitudinal rib is fixedly provided on the outer circumference of the connector body along the circumferential direction, a connecting plate is provided inside the dosage knob, an inner hole coaxial with the dosage knob is opened on the connecting plate, a longitudinal groove is opened on the inner wall of the inner hole at a position corresponding to the longitudinal rib, and the longitudinal rib is movably arranged in the longitudinal groove.

[0016] Preferably, an arc-shaped hole is provided in the middle of the second cantilever, and a connecting column is fixedly provided on the upper end surface of the connecting plate. The connecting column is slidably provided in the arc-shaped hole. When the connecting column moves toward the suspended end of the second cantilever, it squeezes the second cantilever, causing the suspended end of the second cantilever to move toward the center line of the connecting body.

[0017] Preferably, two second cantilever arms are symmetrically arranged along the axis of the connecting body.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The bidirectional dose adjustment component for the injection device described in this utility model has a clutch on the main shaft. The cantilever of the clutch engages with a ratchet, which restricts the main shaft from reversing during forward dose adjustment. When the dose adjustment exceeds the expected injection dose, the dose knob is rotated in the opposite direction, and the clutch squeezes the cantilever to disengage from the ratchet, thus releasing the restriction on the reverse rotation of the main shaft and realizing reverse dose adjustment. This improves the user experience for patients and reduces waste caused by the inability to adjust the dose back.

[0020] The bidirectional dose adjustment component for the injection device described in this utility model, other advantages, objectives and features of this utility model will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this utility model. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the bidirectional dose adjustment component for the injection device disclosed in this utility model;

[0023] Figure 2 This is a schematic diagram of the main shaft disclosed in this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the clutch sleeve disclosed in this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the snap-fit ​​component disclosed in this utility model;

[0026] Figure 5 This is a schematic diagram of the pen body structure disclosed in this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of another dosage bidirectional adjustment component for an injection device disclosed in this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the dosage knob and connector disclosed in this utility model;

[0029] Figure 8 This is a cross-sectional structural diagram of the dosage knob and connector disclosed in this utility model. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0031] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0032] like Figures 1-8 As shown, a bidirectional dosage adjustment component for an injection device includes a main shaft 1, which is rotatably disposed within a pen body 2. A clutch is disposed on the main shaft 1. During forward dosage adjustment, the cantilever 41 of the clutch engages with a ratchet 22 on the pen body 2, restricting the main shaft 1 from reversing. During reverse dosage adjustment, the clutch squeezes the cantilever 41, causing the cantilever 41 to disengage from the ratchet 22, thereby releasing the restriction on the reversal of the main shaft 1.

[0033] Furthermore, the ratchet 22 is located at the lower part of the pen body, and the clutch includes a clutch sleeve 3 located at the lower end of the main shaft 1. A locking member 4 is rotatably arranged inside the clutch sleeve 3, and a cantilever 41 is arranged on the outer wall of the locking member 4. The cantilever 41 is engaged with the ratchet 22.

[0034] Furthermore, a squeezing part 31 is provided at the lower end of the clutch sleeve 3. The squeezing part 31 squeezes the cantilever 41 during reverse dosage adjustment, causing the cantilever 41 to disengage from the ratchet 22.

[0035] Furthermore, a groove 32 is provided at the lower end of the clutch sleeve 3, and a locking block 42 is fixedly provided on the outer circumference of the locking member 4. The locking block 42 is movably disposed within the groove 32.

[0036] The width of the card slot 32 is greater than the width of the card block 42.

[0037] Furthermore, the clutch sleeve 3 is connected to the main shaft 1 for transmission. Multiple protrusions 33 are arranged in an array along the circumferential direction on the inner wall of the clutch sleeve 3. Multiple insertion blocks 11 corresponding to the protrusions 33 are arranged in an array on the outer circumference of the lower end of the main shaft 1. The insertion blocks 11 and the protrusions 33 are inserted into each other.

[0038] In addition, this utility model also provides a bidirectional dosage adjustment component for an injection device, including a main shaft 1, which is rotatably disposed inside a pen body 2. A clutch is provided on the main shaft 1. During forward dosage adjustment, the second cantilever 53 of the clutch is engaged with a ratchet 22 on the pen body 2 or a pen body connector, restricting the main shaft 1 from reversing. During reverse dosage adjustment, the clutch squeezes the second cantilever 53, causing the second cantilever 53 to disengage from the ratchet 22, thereby releasing the restriction on the reversal of the main shaft 1.

[0039] Furthermore, the ratchet 22 is located on the upper part of the pen body, and the clutch includes a connector 5 located on the upper part of the main shaft 1. The connector 5 includes a connector body 51, and a second cantilever 53 is located on the outer circumference of the connector body 51. The suspended end of the second cantilever 53 is engaged with the ratchet 22.

[0040] The connector 5 is circumferentially fixed to the main shaft 1, and the connector 5 is rotatably set inside the dosage knob 6.

[0041] Furthermore, at least one longitudinal rib 52 is fixedly provided on the outer circumference of the connector body 51 along the circumferential direction. A connecting plate 61 is provided inside the dosage knob 6. An inner hole 62 coaxial with the dosage knob 6 is opened on the connecting plate 61. A longitudinal groove 63 is opened on the inner wall of the inner hole 62 at a position corresponding to the longitudinal rib 52. The longitudinal rib 52 is movably arranged in the longitudinal groove 63.

[0042] Furthermore, an arc-shaped hole 54 is opened in the middle of the second cantilever 53, and a connecting post 64 is fixedly installed on the upper end surface of the connecting plate 61. The connecting post 64 is slidably installed in the arc-shaped hole 54. When the connecting post 64 moves toward the suspended end of the second cantilever 53, it squeezes the second cantilever 53, causing the suspended end of the second cantilever 53 to move toward the center line of the connecting body 51.

[0043] Furthermore, two second cantilever arms 53 are symmetrically arranged along the axis of the connecting body 51.

[0044] The working principle of the above technical solution:

[0045] The injection device uses a bidirectional dosage adjustment assembly, including a main shaft 1, which is rotatably mounted inside a pen body 2. A clutch is mounted on the main shaft 1. During forward dosage adjustment, the cantilever 41 of the clutch engages with a ratchet 22 on the pen body 2 or a pen body connector, restricting the main shaft 1 from reversing. During reverse dosage adjustment, the clutch squeezes the cantilever 41, causing the cantilever 41 to disengage from the ratchet 22, thus releasing the restriction on the reversal of the main shaft 1.

[0046] When the dosage knob 6 is directly connected to the pen body 2, the ratchet 22 is set on the pen body 2. When the dosage knob 6 is connected to the pen body 2 through the pen body connector, the ratchet 22 is set on the pen body connector. The pen body connector can be an energy storage component 7 that connects the pen body 2 and the dosage knob 6.

[0047] The clutch includes a clutch sleeve 3 located at the lower end of the main shaft 1. A locking member 4 is rotatably disposed inside the clutch sleeve 3. A cantilever 41 is disposed on the outer wall of the locking member 4. A ratchet 22 is disposed on the lower part of the inner wall of the pen body 2. The cantilever 41 is engaged with the ratchet 22. A pressing part 31 is disposed at the lower end of the clutch sleeve 3. When the dosage is adjusted, the pressing part 31 presses the cantilever 41, causing the cantilever 41 to disengage from the ratchet 22.

[0048] A groove 32 is provided at the lower end of the clutch sleeve 3, and a locking block 42 is fixedly provided on the outer circumference of the locking member 4. The locking block 42 is movably disposed within the groove 32.

[0049] The width of the card slot 32 is greater than the width of the card block 42.

[0050] The inner wall of the extrusion part 31 is arc-shaped, and the radius of the arc of the inner wall of the extrusion part 31 is greater than the radius of the inner wall of the clutch sleeve 3. The extrusion part 31 is located on the outside of the cantilever 41, and the radial position of the cantilever end of the cantilever 41 extends beyond the circumferential surface of the outer wall of the extrusion part 31, so that the cantilever end of the cantilever 41 can engage with the ratchet 22.

[0051] When setting the dosage, the main shaft 1 is rotated clockwise. The main shaft 1 is connected to the protrusion 33 on the inner wall of the clutch sleeve 3 through the plug block 11 at the lower end, which drives the clutch sleeve 3 to rotate. The left side wall of the slot 32 contacts the block 42, which drives the locking piece 4 to rotate clockwise. The suspended end of the cantilever 41 on the locking piece 4 is squeezed by the inclined surface of the ratchet 22 of the pen body 2, and continuously passes over the teeth on the ratchet 22, making a "clicking" sound, indicating to the patient that the dosage is being set. Because the angle of the opposite inclined surfaces of the ratchet 22 and the suspended end of the cantilever 41 is small, the ratchet 22 locks the cantilever 41, preventing the main shaft 1 from reversing.

[0052] The bevel angle refers to the angle between the tooth surface of ratchet 22 and the radial plane passing through the tooth root.

[0053] When the patient adjusts the dosage, if the dosage displayed on the scale is greater than the required injection dosage, the main shaft 1 needs to be rotated. When the main shaft 1 drives the clutch sleeve 3 to rotate counterclockwise, the locking member 4 cannot rotate because the cantilever 41 is locked by the ratchet 22. Since the width of the slot 32 is greater than the width of the block 42, the clutch sleeve 3 rotates counterclockwise. At this time, the inner wall of the squeezing part 31 squeezes the suspended end of the cantilever 41, causing the suspended end of the cantilever 41 to deform towards the center of the locking member 4 until the suspended end of the cantilever 41 disengages from the ratchet 22. The ratchet 22 no longer locks the cantilever 41. At the same time, the right side wall of the slot 32 contacts the block 42. The clutch sleeve 3 drives the locking member 4 to rotate counterclockwise together until the set dosage is adjusted to the injection dosage, completing the dosage adjustment.

[0054] This utility model also provides another type, in which the clutch includes a connecting member 5 disposed on the upper part of the main shaft 1, the connecting member 5 being circumferentially fixed to the main shaft 1, and the connecting member 5 being rotatably disposed within the dosage knob 6.

[0055] The connector 5 includes a connector body 51. At least one longitudinal rib 52 is fixedly provided on the outer circumference of the connector body 51 along the circumferential direction. A connecting plate 61 is provided inside the dosage knob 6. An inner hole 62 coaxial with the dosage knob 6 is opened on the connecting plate 61. A longitudinal groove 63 is opened on the inner wall of the inner hole 62 at a position corresponding to the longitudinal rib 52. The longitudinal rib 52 is movably arranged in the longitudinal groove 63.

[0056] A second cantilever 53 is provided at intervals from the longitudinal rib 52 on the outer circumference of the connector body 51. The suspended end of the second cantilever 53 is engaged with the ratchet 22, and the ratchet 22 is fixedly connected to the pen body 2.

[0057] An arc-shaped hole 54 is opened in the middle of the second cantilever 53. A connecting post 64 is fixedly installed on the upper end surface of the connecting plate 61. The connecting post 64 is slidably installed in the arc-shaped hole 54. When the connecting post 64 moves toward the suspended end of the second cantilever 53, it squeezes the second cantilever 53, causing the suspended end of the second cantilever 53 to move toward the center line of the connecting body 51.

[0058] The connector 5 is located inside the dose knob 6, below the connecting plate 61. The connector body 51 is circumferentially fixed to the main shaft 1. When setting the dose, the dose knob 6 is rotated clockwise. The left side wall of the longitudinal groove 63 presses against the right side of the longitudinal rib 52, causing the connector body 51 to rotate together with the dose knob 6. The suspended end of the second cantilever 53 passes over the teeth on the ratchet 22 and makes a clicking sound, indicating to the patient that the dose setting is in progress. The connector body 51 drives the main shaft 1 to rotate, completing the dose setting.

[0059] When the set dose exceeds the expected dose, the dose knob 6 is rotated in the reverse direction. Since the width of the connecting post 64 is less than the length of the arc hole 54, the connecting body 51 has not yet rotated when the dose knob 6 starts to reverse. At this time, the connecting post 64 reverses with the dose knob 6 and squeezes the second cantilever 53, causing the suspended end of the second cantilever 53 to move towards the center line of the connecting body 51 and disengage from the ratchet 22. At this time, the dose knob 6 reverses at a certain angle, and the right side wall of the longitudinal groove 63 squeezes the left side of the right side of the longitudinal rib 52, causing the connecting body 51 and the main shaft 1 to reverse together. When the set dose returns to the expected dose, the dose correction is completed.

[0060] Anti-slip grooves 65 are provided on the outer circumference of the dosage knob 6. Multiple anti-slip grooves 65 are provided along the circumferential direction of the dosage knob 6, and the length direction of the anti-slip grooves 65 is parallel to the axial direction of the dosage knob 6.

[0061] The beneficial effects of the above technical solution are as follows:

[0062] The bidirectional dose adjustment component for the injection device described in this utility model has a clutch on the main shaft. The cantilever of the clutch engages with a ratchet, which restricts the main shaft from reversing during forward dose adjustment. When the dose adjustment exceeds the expected injection dose, the dose knob is rotated in the opposite direction, and the clutch squeezes the cantilever to disengage from the ratchet, thus releasing the restriction on the reverse rotation of the main shaft and realizing reverse dose adjustment. This improves the user experience for patients and reduces waste caused by the inability to adjust the dose back.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A bidirectional dose adjustment component for an injection device, characterized in that, Includes a main shaft (1), which is rotatably mounted inside the pen body (2). A clutch is mounted on the main shaft (1). During forward dose adjustment, the cantilever (41) of the clutch is engaged with the ratchet (22) of the pen body (2), restricting the main shaft (1) from reversing. During reverse dose adjustment, the clutch squeezes the cantilever (41), causing the cantilever (41) to disengage from the ratchet (22), thus releasing the restriction on the reversal of the main shaft (1).

2. The bidirectional dosage adjustment assembly for the injection device according to claim 1, characterized in that, The ratchet (22) is located at the lower part of the pen body. The clutch includes a clutch sleeve (3) located at the lower end of the main shaft (1). A snap-fit ​​part (4) is rotatably arranged inside the clutch sleeve (3). A cantilever (41) is located on the outer wall of the snap-fit ​​part (4). The cantilever (41) snaps with the ratchet (22).

3. The bidirectional dosage adjustment assembly for the injection device according to claim 2, characterized in that, A squeezing part (31) is provided at the lower end of the clutch sleeve (3). The squeezing part (31) squeezes the cantilever (41) during reverse dosage adjustment, causing the cantilever (41) to disengage from the ratchet (22).

4. The bidirectional dosage adjustment assembly for the injection device according to claim 3, characterized in that, A slot (32) is provided at the lower end of the clutch sleeve (3), and a block (42) is fixedly provided on the outer circumference of the snap-fit ​​part (4). The block (42) is movably disposed in the slot (32). The width of the card slot (32) is greater than the width of the card block (42).

5. The bidirectional dosage adjustment assembly for an injection device according to claim 4, characterized in that, The clutch sleeve (3) is connected to the main shaft (1) for transmission. Multiple protrusions (33) are arranged in an array along the circumferential direction on the inner wall of the clutch sleeve (3). Multiple insertion blocks (11) corresponding to the protrusions (33) are arranged in an array on the outer circumference of the lower end of the main shaft (1). The insertion blocks (11) and the protrusions (33) are inserted into each other.

6. A bidirectional dose adjustment component for an injection device, characterized in that, Includes a main shaft (1), which is rotatably mounted inside the pen body (2). A clutch is mounted on the main shaft (1). During forward dose adjustment, the second cantilever (53) of the clutch is engaged with the ratchet (22) on the pen body (2) or the pen body connector, restricting the main shaft (1) from reversing. During reverse dose adjustment, the clutch squeezes the second cantilever (53), causing the second cantilever (53) to disengage from the ratchet (22), thus releasing the restriction on the reversal of the main shaft (1).

7. The bidirectional dosage adjustment assembly for an injection device according to claim 6, characterized in that, The ratchet (22) is located on the upper part of the pen body. The clutch includes a connector (5) located on the upper part of the main shaft (1). The connector (5) includes a connector body (51). The second cantilever (53) is located on the outer circumference of the connector body (51). The suspended end of the second cantilever (53) is engaged with the ratchet (22). The connector (5) is circumferentially fixed to the main shaft (1), and the connector (5) is rotatably set inside the dosage knob (6).

8. The bidirectional dosage adjustment assembly for an injection device according to claim 7, characterized in that, At least one longitudinal rib (52) is fixedly provided on the outer circumference of the connector body (51) along the circumferential direction. A connecting plate (61) is provided inside the dose knob (6). An inner hole (62) coaxial with the dose knob (6) is opened on the connecting plate (61). A longitudinal groove (63) is opened on the inner wall of the inner hole (62) at a position corresponding to the longitudinal rib (52). The longitudinal rib (52) is movably arranged in the longitudinal groove (63).

9. The bidirectional dosage adjustment assembly for an injection device according to claim 8, characterized in that, An arc-shaped hole (54) is opened in the middle of the second cantilever (53). A connecting column (64) is fixedly installed on the upper end surface of the connecting plate (61). The connecting column (64) is slidably installed in the arc-shaped hole (54). When the connecting column (64) moves towards the suspended end of the second cantilever (53), it squeezes the second cantilever (53) and causes the suspended end of the second cantilever (53) to move towards the center line of the connecting body (51).

10. The bidirectional dosage adjustment assembly for an injection device according to claim 7, characterized in that, Two second cantilever arms (53) are symmetrically arranged along the axis of the connector body (51).

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