Needle inserting device

Abstract

According to the needle inserting device, an elastic driving adjusting piece and an elastic retreating transmission piece are arranged in an inner cavity of a barrel shell, an injection needle assembly is arranged in an avoiding opening of the barrel shell in a penetrating mode, and a hard needle in the injection needle assembly is arranged in an injection hole of a soft needle in a penetrating mode; the elastic driving adjusting part comprises a first elastic pushing assembly and a first unlocking assembly, the bottom of the first elastic pushing assembly is used for fixing the hard needle, and the first unlocking assembly is used for adjusting the telescopic state of the first elastic pushing assembly; the elastic rollback transmission part comprises a second elastic pushing assembly and a second unlocking assembly, the second unlocking assembly is used for controlling the telescopic state of the second elastic pushing assembly, and the second elastic pushing assembly is used for driving the elastic driving adjusting part to move upwards; the first elastic pushing assembly unlocks the second unlocking assembly through the transmission mechanism. According to the scheme, the pain of a patient can be relieved in a soft needle indwelling mode, the hard needle is automatically and elastically separated, and the pain caused by manual pulling is avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, specifically to a needle insertion device. Background Technology

[0002] A hydraulic infusion pump is based on a positive displacement micro-pump that draws hydraulic fluid from a reservoir and pumps it into the liquid chamber of a hydraulic drug reservoir. This pushes the piston of the hydraulic drug reservoir forward, thereby pumping out the medication from the reservoir's liquid chamber. The pumped medication needs to be infused into the body through an indwelling needle. Existing indwelling needles cause pain during use, leading to user fear of the treatment process. Therefore, a new technological solution is needed to reduce user pain during injection treatment. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model proposes a needle insertion device. This solution employs a soft needle retention method to reduce patient pain, while the hard needle automatically and elastically detaches, avoiding the pain caused by manual removal and further reducing pain during needle withdrawal. Furthermore, this application has the advantage of high transmission efficiency; both needle insertion and hard needle removal can be achieved with a single adjustment knob movement, requiring no energy consumption and offering energy-saving and high-efficiency advantages.

[0004] Specifically, this utility model proposes a needle insertion device, including: a cylindrical shell, an injection needle assembly, an elastic drive adjustment component, an elastic retraction transmission component, and a transmission mechanism.

[0005] The cylindrical shell has an inner cavity, in which an elastic drive adjustment component and an elastic retraction transmission component are provided, and the bottom of the cylindrical shell has a clearance opening that penetrates the inner cavity;

[0006] An injection needle assembly is disposed in the clearance opening. The injection needle assembly includes a hard needle and a soft needle, with the hard needle disposed in the injection hole of the soft needle.

[0007] The elastic drive adjustment component includes a first elastic pushing component and a first unlocking component. The bottom of the first elastic pushing component is used to fix the hard needle, and the first unlocking component is used to adjust the extension and retraction state of the first elastic pushing component.

[0008] The elastic retraction transmission component includes a second elastic pushing component and a second unlocking component. The second unlocking component is used to control the extension and retraction state of the second elastic pushing component, and the second elastic pushing component is used to drive the elastic drive adjustment component to move upward.

[0009] The first elastic pushing component unlocks the second unlocking component via the transmission mechanism.

[0010] Preferably, the first elastic pushing component includes:

[0011] The base has mounting openings at both its upper and lower ends, and guide plates are provided on the inner walls of the mounting openings.

[0012] A push rod is slidably inserted into a guide hole in a guide plate in a vertical direction, and a fixing seat for mounting the hard needle is fixed at the bottom of the push rod; a locking plate is provided on the push rod, the locking plate has a locking opening for locking the guide plate, and a first unlocking opening communicating with the guide hole is provided on the guide plate, the first unlocking opening being used to disengage the locking plate from the guide plate;

[0013] A first compression spring, one end of which is fixed to the guide plate of the base, and the other end of which is fixed to the fixed base;

[0014] The first unlocking component is used to drive the push rod to rotate.

[0015] Preferably, the first unlocking component includes a rotating platform, on which an adjustment knob is fixed. The adjustment knob is installed in an adjustment channel on the side wall of the cylindrical shell, and the rotating platform is used to drive the push rod to rotate.

[0016] The base is provided with a first extension arm at its top, and the first extension arm is provided with a horizontal limiting part at its top.

[0017] The rotating platform is provided with a rotating mounting groove for inserting and installing the horizontal limiting part. The rotating mounting groove is used to provide rotation space for the rotating platform and to restrict the horizontal limiting part from moving in the vertical direction.

[0018] Preferably, the projection of the rotating mounting groove along the vertical direction is an arc shape.

[0019] Preferably, the adjustment channel is L-shaped, and the adjustment channel includes a horizontal adjustment port and a vertical adjustment port that are interconnected.

[0020] Preferably, the transmission mechanism includes:

[0021] A drive column, which is fixed to the fixed base;

[0022] The driven plate is fixedly connected to the second unlocking component. The driven plate is provided with a transmission ramp, and the drive column is used to squeeze the transmission ramp and rotate the driven plate.

[0023] Preferably, the second unlocking component includes:

[0024] A rotating plate, on which the driven plate is fixed, and a locking block is provided on the circumferential surface of the rotating plate;

[0025] An annular baffle is fixed on the inner wall of the cylindrical shell and pressed against the locking block. The annular baffle is provided with a second unlocking port, which is used for the locking block to move in the vertical direction.

[0026] The lower end of the base is mounted on the rotating plate.

[0027] Preferably, the lower end of the base is provided with a second extension arm, which is located between the rotating plate and the annular baffle. The lower end of the second extension arm is provided with a buckle, which is used to clamp the rotating plate.

[0028] Preferably, the rotating plate is provided with a limiting opening, and the second extension arm is disposed in the limiting opening.

[0029] Preferably, the second elastic pushing component is a second compression spring, with the lower end of the second compression spring pressing against the annular baffle and the upper end of the second compression spring pressing against the annular flange on the circumferential surface of the base.

[0030] Preferably, the top of the soft needle is fixed with a soft needle seat, the soft needle seat has a drug flow channel, and the side wall of the soft needle seat is provided with a drug inlet that communicates with the drug flow channel.

[0031] Preferably, the lower end of the drug flow channel communicates with the injection hole of the soft needle, and the upper end of the drug flow channel is provided with a rubber stopper. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0033] Figure 1 This is a three-dimensional structural diagram of the needle insertion device proposed in this embodiment;

[0034] Figure 2 This is a schematic diagram of the internal structure of the needle insertion device proposed in this embodiment;

[0035] Figure 3 This is a schematic diagram showing the positional relationship between the soft needle and the hard needle in this embodiment;

[0036] Figure 4 This is a schematic diagram showing the positional relationship between the locking plate and the first unlocking port in this embodiment from a top-down perspective;

[0037] Figure 5 This is a schematic diagram of the structure of the soft needle holder and the soft needle in this embodiment;

[0038] Figure 6 This is a schematic diagram showing the position and structure of the latch and the limiting port in this embodiment;

[0039] Figure 7 This is a schematic diagram showing the position and structure of the horizontal limiting part and the rotating mounting groove in this embodiment;

[0040] Figure 8 This is a schematic diagram showing the position and structure of the locking plate in this embodiment;

[0041] Figure 9 This is a schematic diagram showing the position and structure of the insertion slot in this embodiment;

[0042] Figure 10 This is a schematic diagram of the second unlocking port and locking block in this embodiment.

[0043] The reference numerals used in the attached figures are as follows:

[0044] 11-Cylinder shell; 12-Injection needle assembly; 13-Elastic drive adjustment component; 14-Elastic return transmission component; 15-Transmission mechanism; 16-Hard needle; 17-Soft needle; 18-First elastic pushing component; 19-First unlocking component; 20-Second elastic pushing component; 21-Second unlocking component; 22-Base; 23-Guide plate; 24-Push rod; 25-Fixing seat; 26-Clamping plate; 27-Clamping port; 28-Guide hole; 29-First unlocking port; 30-First compression spring; 31-Rotating table; 32-Adjustment 33-First extension arm; 34-Horizontal limit part; 35-Rotating mounting groove; 36-Horizontal adjustment port; 37-Vertical adjustment port; 38-Drive column; 39-Driven plate; 40-Transmission inclined surface; 41-Rotating plate; 42-Snap-fit ​​part; 43-Second extension arm; 44-Limit port; 45-Second compression spring; 46-Soft needle seat; 47-Medicine flow channel; 48-Medicine inlet; 49-Rubber stopper; 50-Intercepting groove; 51-Locking block; 52-Annular baffle; 53-Second unlocking port; 54-Annular flange. Detailed Implementation

[0045] The technical solutions of this application will be further described below with reference to specific embodiments. However, this application is not limited to these embodiments. In addition, the technical terms "upper," "lower," "left," and "right" used in this application are not intended to limit the positional relationship of this solution in specific use. For example, this device may be placed vertically or horizontally in actual use, and its position and orientation will change accordingly. Therefore, the actual use environment cannot be used to limit the technical terms of this application. The technical terms "upper," "lower," "left," and "right" in this application are only used to explain and understand the technical solutions of this application in conjunction with the accompanying drawings.

[0046] Combination Figures 1 to 9 As shown, this embodiment proposes a needle insertion device, including: a barrel shell 11, an injection needle assembly 12, an elastic drive adjustment component 13, an elastic retraction transmission component 14, and a transmission mechanism 15.

[0047] The cylindrical shell 11 has an inner cavity, in which an elastic drive adjustment component 13 and an elastic retraction transmission component 14 are provided. The bottom of the cylindrical shell 11 has a clearance opening that penetrates the inner cavity.

[0048] Injection needle assembly 12, which is inserted into the clearance opening, includes a rigid needle 16 and a flexible needle 17, such as... Figure 3 As shown, the hard needle 16 is inserted into the injection hole of the soft needle 17;

[0049] The elastic drive adjustment component 13 includes a first elastic pushing component 18 and a first unlocking component 19. The bottom of the first elastic pushing component 18 is used to fix the hard needle 16, and the first unlocking component 19 is used to adjust the extension and retraction state of the first elastic pushing component 18.

[0050] The elastic retraction transmission component 14 includes a second elastic pushing component 20 and a second unlocking component 21. The second unlocking component 21 is used to control the extension and retraction state of the second elastic pushing component 20, and the second elastic pushing component 20 is used to drive the elastic drive adjustment component 13 to move upward.

[0051] The first elastic pushing component 18 unlocks the second unlocking component 21 via the transmission mechanism 15.

[0052] In the initial state, the first elastic pushing component 18 and the second elastic pushing component 20 are in a compressed state. When the first elastic pushing component 18 is fully extended, the injection of the hard needle 16 is realized, and the hard needle 16 simultaneously drives the soft needle 17 into the human tissue. At the same time, the second unlocking component 21 unlocks the second elastic pushing component 20, and the second elastic pushing component 20 drives the entire first elastic pushing component 18 to move upward, thereby detaching the hard needle 16 from the soft needle 17. The use of the soft needle 17 in this solution can reduce the patient's pain, and the automatic elastic detachment of the hard needle 16 avoids the pain caused by manual removal, further reducing the pain when the hard needle 16 is removed. Moreover, this application has the advantage of high transmission efficiency; the two steps of needle insertion and hard needle 16 removal can be achieved by turning the adjustment knob 32 only once, without consuming energy, which has the advantages of energy saving and high efficiency.

[0053] Furthermore, such as Figure 5 As shown, a soft needle seat 46 is fixed to the top of the soft needle 17. The soft needle seat 46 has a drug flow channel 47, and the side wall of the soft needle seat 46 is provided with a drug inlet 48 that communicates with the drug flow channel 47. The lower end of the drug flow channel 47 communicates with the injection hole of the soft needle 17, and the upper end of the drug flow channel 47 is provided with a rubber stopper 49.

[0054] In some application scenarios of this needle insertion device, the scenario is not intended to limit the specific scope of use of the needle insertion device in this application. The needle insertion device can be used in combination with the main unit. The main unit has a needle insertion hole and is attached to the human body. The needle insertion device is installed on the main unit. After the needle insertion device is in operation, the soft needle holder 46 is locked in the needle insertion hole. The drug liquid pipeline on the main unit is connected to the drug inlet 48. Then the needle insertion device and the hard needle 16 can be disassembled to reduce the weight of the human body. In addition, after the soft needle 17 is inserted into the human tissue, the soft needle holder 46 in this solution can also be locked in other ways, such as manually or mechanically.

[0055] As one implementation method of this embodiment, combined with Figure 2 , Figure 4 , Figure 8 and Figure 9 The first elastic pushing component 18 includes:

[0056] The base 22 has mounting openings at both its upper and lower ends, and a guide plate 23 is provided on the inner wall of the mounting opening.

[0057] A push rod 24 is slidably inserted into a guide hole 28 in a guide plate 23 in a vertical direction, and a fixing seat 25 for mounting a hard needle 16 is fixed at the bottom of the push rod 24; a locking plate 26 is provided on the push rod 24, and the locking plate 26 has a locking opening 27 for locking the guide plate 23; the guide plate 23 is provided with a first unlocking opening 29 that communicates with the guide hole 28, and the first unlocking opening 29 is used to disengage the locking plate 26 from the guide plate 23;

[0058] The first compression spring 30 has one end fixed to the guide plate 23 of the base 22 and the other end fixed to the fixed base 25;

[0059] The first unlocking component 19 is used to drive the push rod 24 to rotate.

[0060] In this solution, the first unlocking component 19 drives the push rod 24 to rotate, thereby moving the locking plate 26 on the push rod 24 to the first unlocking port 29. At this time, the elastic force of the first compression spring 30 is released, and the fixed seat 25, together with the push rod 24 and the injection needle assembly 12, moves downward.

[0061] As one implementation method of this embodiment, combined with Figure 7 , Figure 8 , Figure 9 The first unlocking component 19 includes a rotating platform 31, on which an adjustment knob 32 is fixed. The adjustment knob 32 is installed in the adjustment channel on the side wall of the cylindrical shell 11. The rotating platform 31 is used to drive the push rod 24 to rotate.

[0062] The base 22 is provided with a first extension arm 33 at its top, and the first extension arm 33 is provided with a horizontal limiting part 34 at its top.

[0063] The rotary table 31 is provided with a rotating mounting groove 35 for inserting and installing the horizontal limiting part 34. The rotating mounting groove 35 provides rotation space for the rotary table 31 and restricts the horizontal limiting part 34 from moving in the vertical direction.

[0064] In this design, the rotary table 31 can rotate relative to the base 22, and the rotary table 31 and the base 22 maintain synchronous linear motion in the vertical direction.

[0065] Furthermore, the projection of the rotating mounting groove 35 along the vertical direction is an arc shape.

[0066] Furthermore, the rotary table 31 is also provided with a clearance passage for the first extension arm 33 to pass through, so as to provide clearance space for the relative movement of the rotary table 31 and the first extension arm 33.

[0067] As one implementation method of this embodiment, such as Figure 1 As shown, the adjustment channel is L-shaped and includes a horizontal adjustment port 36 and a vertical adjustment port 37 that are interconnected. In this design, the horizontal adjustment port 36 provides space for the rotation of the adjustment knob 32. When the rotary table 31 is pushed upward, the vertical adjustment port 37 provides vertical space for the adjustment knob 32.

[0068] Furthermore, in combination Figure 8 and Figure 9 As shown, the lower end of the rotary table 31 is provided with a insertion slot 50 for inserting and fastening the push rod 24 and the locking plate 26, so as to make the rotary table 31 and the push rod 24 rotate synchronously.

[0069] There are four snap-fit ​​plates 26, forming a cross shape, and the insertion slot 50 is also cross-shaped.

[0070] As one implementation method of this embodiment, combined with Figure 2 , Figure 6 and Figure 8 As shown, the transmission mechanism 15 includes:

[0071] Drive column 38, drive column 38 is fixed on the fixed base 25;

[0072] The driven plate 39 is fixedly connected to the second unlocking component 21. The driven plate 39 is provided with a transmission inclined surface 40. The drive column 38 is used to press the transmission inclined surface 40 and make the driven plate 39 rotate. At this time, the driven plate 39 revolves around the axis of the cylindrical shell 11.

[0073] In this design, the driven plate 39 is rotated by the drive column 38, thereby unlocking the second unlocking component 21.

[0074] Among them, combined Figure 2 , Figure 6 , Figure 8 and Figure 10 The second unlocking component 21 includes:

[0075] A rotating plate 41 is provided with a driven plate 39 fixed on it, and a locking block 51 is provided on the circumferential surface of the rotating plate 41.

[0076] An annular baffle 52 is fixed on the inner wall of the cylindrical shell 11 and is pressed on the locking block 51. The annular baffle 52 is provided with a second unlocking port 53, which is used for the locking block 51 to move in the vertical direction.

[0077] The lower end of the base 22 is mounted on the rotating plate 41, and the base 22 passes through the circular opening of the annular baffle 52. The rotating plate 41 is provided with a clearance opening for the insertion of the injection needle assembly 12.

[0078] In this scheme, the driven plate 39 drives the rotating plate 41 to rotate during the circular motion, thereby aligning the locking block 51 with the second unlocking port 53. Under the action of the second elastic pushing component 20, the rotating plate 41, together with the base 22, the rotating table 31, the adjusting knob 32, the push rod 24, the fixed seat 25 and the hard needle 16, are pushed upward. Among them, the soft needle 17 and the soft needle seat 46 are limited and fixed. When the hard needle 16 is pushed upward, the hard needle 16 and the soft needle 17 are separated.

[0079] When the soft needle holder 46 is locked in the needle inlet of the main unit by a snap-fit ​​connection, the position of the soft needle holder 46 and the soft needle 17 is restricted, so that when the hard needle 16 is pushed upward, it can be separated from the soft needle 17.

[0080] Furthermore, the rotating plate 41 is provided with a limiting port 44, and the second extension arm 43 is disposed in the limiting port 44.

[0081] This solution uses the second extension arm 43 and the limiting port 44 to limit the rotation angle of the rotating plate 41, preventing arbitrary rotation of the rotating plate 41. On the one hand, it can make the drive column 38 and the driven plate 39 effectively contact each other, thereby improving the reliability of the transmission.

[0082] On the other hand, it can reduce the angle of free rotation of the driven plate 39 and the rotating plate 41, and reduce the risk of the locking block 51 on the rotating plate 41 disengaging from the second unlocking port 53 before the soft needle 17 descends to its limit position.

[0083] Furthermore, in combination Figure 2 and Figure 6As shown, the second elastic pushing component 20 is a second compression spring 45. The lower end of the second compression spring 45 presses against the annular baffle 52, and the upper end of the second compression spring 45 presses against the annular flange 54 on the circumference of the base 22.

[0084] Combination Figures 1 to 10 As shown, the specific working principle of this solution is as follows:

[0085] In the initial state, both the first compression spring 30 and the second compression spring 45 are in a compressed energy storage state.

[0086] The adjustment knob 32 is manually turned so that it moves to its limit in the horizontal adjustment port 36. At this time, the adjustment knob 32 is located at the lower end of the vertical adjustment port 37. At the same time, the rotary table 31 drives the push rod 24 and the locking plate 26 to rotate at a certain angle. The locking plate 26 just enters the first unlocking port 29. The elastic potential energy of the first compression spring 30 is released and pushes the fixed seat 25 downward. At this time, the hard needle 16 and the soft needle 17 are inserted into the human tissue.

[0087] During the downward movement of the fixed seat 25, the drive column 38 drives the rotating plate 41 to rotate through the driven plate 39. When the fixed seat 25 moves downward to the limit position, the locking block 51 on the rotating plate 41 aligns with the second unlocking port 53 to unlock. Under the action of the second elastic pushing component 20, the rotating plate 41, together with the base 22, the rotating table 31, the adjusting knob 32, the push rod 24, the fixed seat 25 and the hard needle 16, are pushed upward. Among them, the soft needle 17 and the soft needle seat 46 are limited and fixed. When the hard needle 16 is pushed upward, the hard needle 16 and the soft needle 17 are separated.

[0088] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A needle insertion device, characterized in that, include: The components include a barrel shell (11), an injection needle assembly (12), an elastic drive adjustment element (13), an elastic return transmission element (14), and a transmission mechanism (15). The cylindrical shell (11) has an inner cavity, in which an elastic drive adjustment component (13) and an elastic retraction transmission component (14) are provided, and the bottom of the cylindrical shell (11) is provided with a clearance opening that penetrates the inner cavity; Injection needle assembly (12), the injection needle assembly (12) is inserted into the clearance opening, the injection needle assembly (12) includes a hard needle (16) and a soft needle (17), the hard needle (16) is inserted into the injection hole of the soft needle (17); The elastic drive adjustment member (13) includes a first elastic pushing component (18) and a first unlocking component (19). The bottom of the first elastic pushing component (18) is used to fix the hard needle (16), and the first unlocking component (19) is used to adjust the extension and retraction state of the first elastic pushing component (18). The elastic retraction transmission component (14) includes a second elastic pushing component (20) and a second unlocking component (21). The second unlocking component (21) is used to control the extension and retraction state of the second elastic pushing component (20). The second elastic pushing component (20) is used to drive the elastic drive adjustment component (13) to move upward. The first elastic pushing component (18) unlocks the second unlocking component (21) via the transmission mechanism (15).

2. The needle insertion device according to claim 1, characterized in that, The first elastic pushing component (18) includes: The base (22) has an installation port through the upper and lower ends, and a guide plate (23) is provided on the inner wall of the installation port; A push rod (24) is slidably inserted into the guide hole (28) of the guide plate (23) in a vertical direction, and a fixing seat (25) for installing the hard needle (16) is fixed at the bottom of the push rod (24); a locking plate (26) is provided on the push rod (24), the locking plate (26) has a locking opening (27) for locking the guide plate (23), and a first unlocking opening (29) is provided on the guide plate (23) that communicates with the guide hole (28), the first unlocking opening (29) is used to disengage the locking plate (26) from the guide plate (23); A first compression spring (30) is fixed at one end to the guide plate (23) of the base (22) and at the other end to the fixed seat (25). The first unlocking component (19) is used to drive the push rod (24) to rotate.

3. The needle insertion device according to claim 2, characterized in that, The first unlocking component (19) includes a rotating platform (31), on which an adjustment knob (32) is fixed. The adjustment knob (32) is installed in the adjustment channel on the side wall of the cylindrical shell (11). The rotating platform (31) is used to drive the push rod (24) to rotate. The base (22) is provided with a first extension arm (33) at its top, and the first extension arm (33) is provided with a horizontal limiting part (34) at its top. The rotary table (31) is provided with a rotating mounting groove (35) for inserting and installing the horizontal limiting part (34). The rotating mounting groove (35) is used to provide rotation space for the rotary table (31) and to restrict the horizontal limiting part (34) from moving in the vertical direction.

4. The needle insertion device according to claim 3, characterized in that, The projection of the rotating mounting groove (35) in the vertical direction is an arc shape.

5. The needle insertion device according to claim 3, characterized in that, The adjustment channel is L-shaped and includes a horizontal adjustment port (36) and a vertical adjustment port (37) that are interconnected.

6. The needle insertion device according to claim 2, characterized in that, The transmission mechanism (15) includes: A drive column (38) is fixed to the fixed base (25); The driven plate (39) is fixedly connected to the second unlocking component (21). The driven plate (39) is provided with a transmission ramp (40). The drive column (38) is used to press the transmission ramp (40) and make the driven plate (39) rotate.

7. The needle insertion device according to claim 6, characterized in that, The second unlocking component (21) includes: A rotating plate (41) is provided with a driven plate (39) fixed on it, and a locking block (51) is provided on the circumferential surface of the rotating plate (41). An annular baffle (52) is fixed on the inner wall of the cylindrical shell (11) and pressed on the locking block (51). The annular baffle (52) is provided with a second unlocking port (53), which is used for the locking block (51) to move in the vertical direction. The lower end of the base (22) is mounted on the rotating plate (41).

8. The needle insertion device according to claim 7, characterized in that, The lower end of the base (22) is provided with a second extension arm (43), which is located between the rotating plate (41) and the annular baffle (52). The lower end of the second extension arm (43) is provided with a buckle (42), which is used to clamp the rotating plate (41).

9. The needle insertion device according to claim 8, characterized in that, The rotating plate (41) is provided with a limiting port (44), and the second extension arm (43) is disposed in the limiting port (44).

10. The needle insertion device according to claim 7, characterized in that, The second elastic pushing component (20) is a second compression spring (45). The lower end of the second compression spring (45) is pressed on the annular baffle (52), and the upper end of the second compression spring (45) is pressed against the annular flange (54) on the circumferential surface of the base (22).

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