TWI542376B - Anti-accidental syringe - Google Patents

Description

Anti-injury syringe

The invention relates to a syringe for preventing accidental injury, in particular to an operation structure of a syringe for preventing accidental injury.

Injection syringes are commonly used by medical personnel. Many medical personnel often have needle-needle accidents when using syringes. The occurrences can be summarized as follows:

1. The medical staff is prone to needle sticking before using it and discarding it into the exclusive waste barrel;

2. Use a needle in the event of a patient's incitement;

3. Disused needles are not yet classified and are placed together with medical waste (eg cotton balls, gauze, etc.).

In order to solve the problem of needle sticking, there are many safety needles in the design direction. For example, some needles can be retracted into the original filling space through complicated operation methods. However, the retractable safety syringe has the need to empty the contents of the syringe before the retraction mechanism can be started, and it cannot meet the condition that the syringe often has contents in the clinic, that is, it must be discarded.

For example, Taiwan Notice No. I449550 "Safety Syringe that can be automatically retracted" is mainly used after being automatically retracted into the syringe by the vacuum generated in the syringe by the movement of the plunger. The retraction mechanism obviously affects the convenience of the medical staff in using the syringe. If the retraction is completed when the injection process is not completed, it may cause unnecessary pain to the patient, and the residual medicine and blood are easily retracted. Dropping, causing environmental pollution, and prone to infection problems.

Another example is Taiwan's Announcement No. I266638 "Destroyed Safety Syringe". When the syringe is finished, the hook of the push rod is hooked on the opening of the inner edge of the barrel outlet, and then the cover is rotated to cut the cutter. The disconnecting portion pulls the needle back into the syringe to achieve the complete destruction effect of the syringe, and prevents the syringe after use from being recycled. However, the user uses the cover to rotate to cut the disconnecting portion of the cutter. The action, in actual operation, still has the risk of accidentally touching the needle, especially when the cutting knife is difficult to cut the broken portion, the user needs to exert more force to increase the risk of the needle stick.

Some even change the needle material so that it has only enough hard force to insert into the tissue in a straight line. However, by changing the material of the needle, although it has sufficient hard force to insert into the tissue in the straight direction, there is still a risk of needle sticking in the non-linear direction.

Another example is the "Safety syringe" of the U.S. Patent No. 5,562,626, which has a tubular body which is clamped to the measuring cylinder by a compression spring. When the injection is completed, the tubular body and the measuring cylinder are loosened. The tube is pushed out by the spring to cover the needle, but it is practically activated.

For example, Taiwan Announcement No. M494619, "Safety Injection Syringes in the Field of Medical Technology", the protection device comprises a tube body and an elastic member, the tube system is sleeved in a hollow cylinder, and the elastic element surrounds the housing and the hollow cylinder The accommodating space between the tube body is provided with a fastening portion and a flange, so that the elastic body can be used to push out the tube body, so that the needle can be covered by the tube body, and the risk of needle sticking can be avoided.

As described above, it is a protection method in which the tube body is pushed out by elasticity, so that the needle can be covered by the tube body, which is quite convenient in use, but in practice, it is possible that the injection process has not been completed, because the malfunction causes the tube body to advance. Pop up, it will also cause unnecessary pain to the patient.

The main object of the present invention is to disclose an anti-missing syringe with a safety protection device, which can avoid the risk of malfunction.

In order to achieve the above object, the present invention provides a syringe for preventing accidental injury, comprising an injection syringe, a protection sleeve and a positioning clip, wherein the syringe has a cylinder and is connected to one side of the barrel and communicates with the sleeve An injection head having a hollow tube body, a set of inlet ends and a piercing end disposed at opposite ends of the hollow tube body, and a fixing body on the outer surface of the hollow tube body Adjacent to the sleeve-shaped annular protrusion, the length of the hollow tube body is greater than the length of the injection head, the barrel body penetrates into the hollow tube body from the sleeve end and has an axial rotation relative to the protection sleeve The degree of freedom of axial slip, and the injection head passes through the through end, the annular protrusion has a card fixing position and a release positioning section.

The positioning buckle is disposed at an end of the cylinder body away from the injection head, and the positioning buckle comprises a fulcrum connecting portion connected to the cylinder body, a pressing portion disposed at a direction of the fulcrum connecting portion away from the injection head, and a setting The fulcrum connecting portion is away from the accommodating portion of the pressing portion, and a fixing portion is disposed at an end of the accommodating portion away from the fulcrum connecting portion, wherein the accommodating portion corresponds to the shape and position of the annular protrusion, and Positioning the fastening portion to fix the annular protrusion; the protection sleeve has a fixed position for the fastening portion to be located in the fastening portion of the card and rotating the protection sleeve to release the fastening portion a releasing position of the positioning segment, the fastening portion is driven by the pressing portion, and the fulcrum connecting portion is used as a fulcrum, and an initial position of the annular protruding portion is locked and locked away from the annular protruding portion by the fixing portion In an actuating position, and when the protective sleeve is rotated to the release position, the annular protrusion is locked from the positioning of the securing portion.

According to this, when the protective sleeve is rotated to the fixed position, even when the pressing portion is pressed and the locking portion is displaced to the actuating position, the annular protrusion does not get detached from the positioning of the locking portion, so Make sure there are no signs of malfunction. When the protective sleeve is rotated to the release position, and the pressing portion is pressed to displace the locking portion to the actuating position, the annular protrusion is released from the positioning of the locking portion, that is, When the user needs to simultaneously operate the protective sleeve to rotate to the release position and press the pressing portion, the protective sleeve can be externally moved to protect the injection head, which can effectively solve the malfunction caused by accidentally touching the pressing portion.

10‧‧‧Injection syringe

11‧‧‧Cylinder

111‧‧‧First card space

112‧‧‧First arrival

113‧‧‧Baffle

12‧‧‧Put

13‧‧‧Injection head

20‧‧‧protective sleeve

21‧‧‧ hollow body

22‧‧‧Set-in

23‧‧‧Out of the end

24‧‧‧ ring relief

241‧‧‧ card fixed position

242‧‧‧ release positioning segment

243‧‧‧ Missing slot

25‧‧‧Second card space

26‧‧‧Secondary

30‧‧‧ Positioning clips

31‧‧‧ fulcrum connection

32‧‧‧ Pressing Department

321‧‧‧Bumps

33‧‧‧ 容部

34‧‧‧Card Department

35‧‧‧Limited parts

40‧‧‧Compressed space

50‧‧‧ card firmware

60‧‧‧Flexible components

Fig. 1A is a perspective view showing the appearance of the present invention.

Fig. 1B is a perspective view showing the appearance of another state of the present invention.

Figure 2 is an exploded view of the structure of the present invention.

Figure 3 is a cross-sectional structural view of the present invention.

Figure 4 is a schematic view of the use of the present invention.

Figure 5 is a schematic view of the use of the present invention.

Figure 6 is a partial structural view of another preferred embodiment of the present invention.

Figure 7 is a partial structural view of another preferred embodiment of the present invention.

FIG. 8A is a cross-sectional structural view of another preferred embodiment of the present invention. FIG.

FIG. 8B is a cross-sectional structural view of another preferred embodiment of the present invention. FIG.

FIG. 9A is a partial structural view of another preferred embodiment of the present invention. FIG.

FIG. 9B is a partial structural view of another preferred embodiment of the present invention. FIG.

FIG. 10A is a cross-sectional structural view of another preferred embodiment of the present invention. FIG.

FIG. 10B is a cross-sectional structural view of another preferred embodiment of the present invention. FIG.

The detailed description and technical content of the present invention will now be described as follows:

Please refer to FIG. 1A and FIG. 1B to FIG. 3 for the appearance of the present invention, which is a three-dimensional, structurally exploded and cross-sectional structural view of the present invention. As shown in the figure, the present invention is a syringe for preventing accidental injury, including The injection syringe 10, a protective sleeve 20 and a positioning clip 30, wherein the syringe 10 has a cylinder 11 and a push rod 12 which is in close contact and slides into the inner side of the cylinder 11 and is disposed on the cylinder 11 is away from the side of the push rod 12 and communicates with an injection head 13 in the barrel 11.

The protective sleeve 20 has a hollow tubular body 21, a set of inlet ends 22 and a through end 23 disposed at opposite ends of the hollow tubular body 21, and a fixed end surface adjacent to the hollow tubular body 21 and adjacent thereto. The annular protrusion 24 of the insertion end 22 has a length greater than the length of the injection head 13, and the barrel 11 is inserted into the hollow tube body 21 from the nesting end 22 and has a relative The protection sleeve 20 has a degree of freedom of axial rotation and axial slip, and the injection head 13 passes through the through end 23 . The annular protrusion 24 has a card fixing position 241 and a release positioning section 242 .

The positioning clip 30 is disposed at an end of the barrel 11 away from the injection head 13. The positioning clip 30 includes a fulcrum connecting portion 31 connected to the barrel 11, and a locating portion 31 is disposed away from the fulcrum. a pressing portion 32 in the direction of the injection head 13 , a receiving portion 33 disposed on the fulcrum connecting portion 31 away from the pressing portion 32 , and a fixing portion 34 disposed at an end of the receiving portion 33 away from the fulcrum connecting portion 31 , The accommodating portion 33 corresponds to the shape and position of the annular protrusion 24 , and the locking portion 34 is positioned to clamp the annular protrusion 24 .

Please also refer to FIG. 4 and FIG. 5 together. The protective sleeve 20 has a fixed position for the fastening portion 34 at the card fixing position 241 (FIG. 1B) and a rotation. The protection sleeve 20 is located at the release position of the release positioning section 242 (as shown in FIG. 1A ), and the fastening portion 34 is driven by pressing the pressing portion 32 , and the fulcrum connection portion 31 is used as a fulcrum. The locking portion 34 is positioned to clamp an initial position of the annular protrusion 24 (as shown in FIG. 3 ) to swing away from the annular protrusion 24 to an actuating position ( FIG. 4 ), and the protective sleeve 20 is rotated to the When the position is released, the annular protrusion 24 is released from the positioning of the fastening portion 34.

In order to indicate that the protection sleeve 20 is rotated to the release position, a gap 243 (shown in FIG. 2) may be disposed adjacent to the fastening portion 242 of the release positioning portion 242, so when the protection sleeve 20 rotates When the position is released, the locking portion 34 can fall into the notch 243, and has an axial movement feeling, so that the user can clearly know that the protection sleeve 20 has been rotated to the release position, and in implementation, the sleeve 20 can further color mark or indicator or text to inform the user to release the position of the positioning segment 242, which can further increase the convenience of the user.

A compression space 40 can be provided at the junction between the edge of the tubular body 11 and the pressing portion 32. Thus, the pressing portion 32 can press the compression space 40 to make the fastening portion 34 tilt the corresponding angle. In other words, as long as the size of the compression space 40 is controlled, the maximum angle at which the trim portion 34 can be lifted is a constant value. In addition, the release positioning section 242 can axially span the annular protrusion 24, and the thickness of the release positioning section 242 is lower than the thickness of the card fixing section 241.

In order to prevent the protective sleeve 20 from falling off when it is moved out, the function of protecting the injection head 13 is lost. The cylinder 11 can be provided with a first fastening space 111 near the end of the injection head 13, and the protection sleeve 20 is close to the The nesting end 22 is provided with a second fastening space 25 corresponding to the first fastening space 111, and has a fastener 50 for simultaneously clamping the first fastening space 111 and the second fastening space 25.

In a practical implementation, the first fastening space 111 and the second fastening space 25 can be in the shape of a slot. Therefore, the normal expansion of the fastener 50 can be disposed in the first fastening space 111. When the second fastening space 25 is displaced to the first fastening space 111, the fastener 50 is opened outwardly to simultaneously lock the second fastening space 25 and the first fastening space 111 (see FIG. 5). And the injection head 13 is completely located within the hollow tubular body 21.

In another embodiment, the normally-retracted fastener 50 can be disposed in the second fastening space 25, and when the first fastening space 111 is displaced to the second fastening space 25, the fastener 50 faces The second fastening space 25 and the first fastening space 111 (not shown) are simultaneously contracted. For the design of the mold release, a part of the second fastening space 25 of the protection sleeve 20 can be designed to penetrate the protection sleeve 20 and the second fastening space 25 to avoid the problem that the mold cannot be released.

In addition, the cylinder 11 can be provided with a first abutting edge 112. The protective sleeve 20 is provided with a second abutment 26, and a resilient element 60 is disposed between the second abutment 26 and the first abutment 112. The two sides of the elastic member 60 push the second abutting edge 26 and the first abutting edge 112, and the protective sleeve 20 is axially displaced relative to the cylindrical body 11 to the second clamping space 25. The first fastening space 111, which can be assisted by the elastic member 60, increases the convenience of use. Of course, the protective sleeve 20 can also be pulled up by the user in a manual manner when simultaneously engaging the swinging portion 34 to the actuating position and rotating the protective sleeve 20 to the released position. Moving away from the positioning clip 30 until the fastener 50 simultaneously locks the second fastening space 25 and the first fastening space 111, so that the protection sleeve 20 and the injection syringe 10 are relatively fixed. .

When the pressing portion 32 is pressed, the locking portion 34 can only be lifted at a fixed angle, and when the protective sleeve 20 is rotated to the fixed position (the locking portion 34 is located at the card fixing position 241), even when pressed The pressing portion 32, the locking portion 34 still positions and clamps the annular protrusion 24 to form a safety mechanism to prevent accidental contact. When it is to be used, when the protection sleeve 20 is rotated to the release position, when the pressing portion 32 is pressed to lift the fastening portion 34, the card is lower due to the lower thickness of the release positioning portion 242. The solid portion 34 is detached from the annular protrusion 24 (as shown in FIG. 4); at this time, the annular protrusion 24 is released from the positioning portion of the fastening portion 34 by the action of the elastic member 60. The protective sleeve 20 is axially displaced relative to the cylindrical body 11 to the second fastening space 25 to the first fastening space 111, and the protective sleeve 20 is moved outwardly to cover the injection head 13 (see FIG. 5). Show), avoid the problem of needle sticking.

Referring to FIG. 6 , in another embodiment of controlling the rotation angle of the pressing portion 32 , the tubular body 11 can extend a baffle 113 on the side of the moving direction of the pressing portion 32 , and the baffle 113 and the baffle 113 The pressing portion 32 is sandwiched by a compression space 40. Accordingly, when the pressing portion 32 is pressed, only the compression space 40 can be compressed, and the pressing portion 32 contacts the shutter 113, thereby restricting the rotation angle of the pressing portion 32.

Referring to FIG. 7 , which is another embodiment for controlling the rotation angle of the pressing portion 32 , the pressing portion 32 can extend a protrusion 321 on the side of the moving direction, and the protrusion 321 and the tube The body 11 is sandwiched by a compression space 40, and the protrusion 321 can only be rotated to contact the cylinder 11, thereby limiting the angle of rotation of the pressing portion 32.

Please refer to FIG. 8A and FIG. 8B for another preferred embodiment of the present invention. In this embodiment, the positioning clip 30 is further provided by the fulcrum connecting portion 31. a limiting member 35 extending from a side of the tubular body 11 toward the locking portion 34 , the annular protruding member 24 is disposed between the locking portion 34 , the receiving portion 33 and the limiting member 35 , and the The release positioning section 242 is corresponding to the width of the limiting member 35 and penetrates the annular protrusion 24 .

According to this, when the protective sleeve 20 is rotated to the fixed position (as shown in FIG. 8A), the limiting member 35 is caught by the card fixing position 241 of the annular protrusion 24, and the pressing portion 32 is used. The solid portion 34) is non-rotatable to form a safety mechanism, and when the protective sleeve 20 is rotated to the release position (as shown in FIG. 8B), the limiting member 35 will be releasing the annular projection 24 at this time. Positioning the segment 242, so that the limiting member 35 can be prevented from being caught through the annular protrusion 24, that is, the pressing portion 32 can be pressed and rotated to interlock the locking portion 34 to allow the annular protrusion 24 to be The positioning of the securing portion 34 is released.

Please refer to FIG. 9A and FIG. 9B again, which is another preferred embodiment of the present invention. In this embodiment, the limiting member 35 is also provided, and the width of the limiting member 35 is The positioning portion 242 is released, and the annular protrusion 24 is inserted between the locking portion 34, the receiving portion 33 and the limiting member 35, and the release positioning portion 242 axially straddles and penetrates the ring. The convex portion 24 is shaped, and the width of the fastening portion 34 is greater than the axial width of the release positioning portion 242.

Accordingly, when the protective sleeve 20 is rotated to the fixed position (as shown in FIG. 9A), the limiting member 35 is also caught by the locking portion 241 of the annular protrusion 24, and the pressing portion 32 is The locking portion 34) is non-rotatable to form a safety mechanism, and when the protective sleeve 20 is rotated to the release position (as shown in FIG. 9B), the limiting member 35 is releasing the annular projection 24 at this time. The positioning section 242, because the width of the fastening portion 34 is greater than the axial width of the release positioning section 242, the position of the locking portion 34 can be kept and fixed by the positioning portion 242, and the limiting member 35 is retained. The release positioning portion 242 that can pass through the annular protrusion 24 is not caught, that is, the pressing portion 32 can be pressed and rotated to interlock the locking portion 34 to disengage the annular protrusion 24 from the card. The positioning of the solid portion 34 is fixed.

Please refer to FIG. 10A and FIG. 10B again, which is another preferred embodiment of the present invention. In this embodiment, the limiting member 35 is also provided, and the annular protrusion 24 is also disposed. The axial length of the release positioning portion 242 is corresponding to the axial length of the limiting member 35, and the axis of the release positioning portion 242 is inserted between the locking portion 34 and the receiving portion 33 and the limiting member 35. The width of the corresponding portion is abutment and penetrates the annular protrusion 24, and the release positioning portion 242 is disposed at the end of the annular protrusion 24 near the through end 23.

According to this, when the protection sleeve 20 is rotated to the fixed position, the limiting member 35 is caught by the card fixing position 241 of the annular protrusion 24 (as shown in FIG. 10A), and the pressing portion 32 is The securing portion 34) is non-rotatable to form a safety mechanism. When the protective sleeve 20 is rotated to the release position, the width of the release positioning portion 242 is greater than the securing portion 34 and the release positioning portion 242. The axial length corresponds to the limiting member 35, so that the protective sleeve 20 can be moved up to the entire limit member 35 (as shown in FIG. 10B), that is, the limiting member 35 is no longer caught. That is, the pressing portion 32 can be pressed and rotated to interlock the locking portion 34 to release the annular projection 24 from the positioning of the fastening portion 34.

Moreover, the push rod 12 of the present invention can be provided with a break point (not drawn). After the user uses the injection syringe 10, the push rod 12 can be broken from the break point, and the push rod 12 is broken. The insertion end 23 can be reversely inserted to further avoid the risk of the syringe 10 being reused, while further shielding the injection head 13 for added safety.

In summary, this creation has the following advantages:

1. When the protective sleeve is rotated to the fixed position, even when the pressing portion is pressed and the locking portion is displaced to the actuating position, the annular protrusion does not get detached from the positioning of the locking portion, so Make sure there are no signs of malfunction.

2. When the protective sleeve is rotated to the release position, and the pressing portion is pressed to displace the locking portion to the actuating position, the annular protrusion is released from the positioning of the locking portion. That is, when the user needs to simultaneously operate the protective sleeve to rotate to the release position and press the pressing portion, the protective sleeve can be externally moved to protect the injection head, forming a double insurance, which can effectively solve the malfunction caused by accidentally touching the pressing portion. problem.

3. Automatically clamping through the proximal end of the barrel, and automatically clamping the second clamping space and the first clamping space, the positioning sleeve can be positioned, and the protective sleeve is prevented from being excessively displaced and falling off.

4. The protective sleeve is automatically ejected by the elastic force of the elastic member, which can increase the convenience and safety of use.

5. The pusher can be broken and inserted back into the piercing end to further shield the injection head for added safety.

Therefore, the present invention is highly progressive and conforms to the requirements of the invention patent application, and the application is made according to law, and the praying office grants the patent as soon as possible.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

10‧‧‧Injection syringe

11‧‧‧Cylinder

111‧‧‧First card space

112‧‧‧First arrival

12‧‧‧Put

13‧‧‧Injection head

20‧‧‧protective sleeve

21‧‧‧ hollow body

22‧‧‧Set-in

23‧‧‧Out of the end

24‧‧‧ ring relief

241‧‧‧ card fixed position

242‧‧‧ release positioning segment

243‧‧‧ Missing slot

30‧‧‧ Positioning clips

31‧‧‧ fulcrum connection

32‧‧‧ Pressing Department

33‧‧‧ 容部

34‧‧‧Card Department

50‧‧‧ card firmware

60‧‧‧Flexible components

Claims (10)

[Item 1]
A syringe for preventing accidental injuries, including:
An injection syringe having a barrel and an injection head disposed on one side of the barrel and communicating with the barrel;
a protective sleeve having a hollow tube body, a set of inlet ends and a piercing end disposed at opposite ends of the hollow tube body, and a fixing body adjacent to the outer surface of the hollow tube and adjacent to the sleeve An annular annular protrusion having a length greater than a length of the injection head, the cylindrical body penetrating into the hollow tube body from the sleeve end and having an axial rotation and an axial sliding direction relative to the protection sleeve a degree of freedom of movement, and the injection head passes through the through end, the annular protrusion has a card fixing position and a release positioning section; and a positioning clip disposed at an end of the barrel away from the injection head, a fulcrum connecting portion connected to the tubular body, a pressing portion disposed at a direction away from the injection head of the fulcrum connecting portion, a receiving portion disposed at the fulcrum connecting portion away from the pressing portion, and a housing portion disposed at the fulcrum connecting portion The fixing portion is away from the fixing portion of the connecting portion of the fulcrum, and the receiving portion corresponds to the shape and position of the annular protruding portion, and the positioning portion is positioned to fix the annular protruding portion;
The protective sleeve has a fixed position for the fastening portion to be located in the fixing portion of the card, and a rotation position of the protection sleeve to position the fastening portion in the release positioning portion, the fastening portion is pressed by the pressing portion Driving, with the fulcrum connecting portion as a fulcrum, an initial position of the annular protruding portion of the locking portion is slid away from the annular protruding member to an actuating position, and the protective sleeve is rotated to the release position In position, the annular projection is released from the positioning of the fastening portion. [Item 2]
The syringe for preventing accidental injury according to the first aspect of the invention, wherein the cylinder is provided with a first fastening space near an end of the injection head, and the protection sleeve is disposed adjacent to the nesting end corresponding to the first card. a second fastening space of the solid space, and having a card fastener that simultaneously locks the first fastening space cylinder and the second fastening space. [Item 3]
The syringe for preventing accidental injury according to the second aspect of the invention, wherein the cylinder is provided with a first abutting edge, the protective sleeve is provided with a second abutting edge, and the second abutting edge is between the first abutting edge and the first abutting edge An elastic member is disposed, the two sides of the elastic member press the second abutting edge and the first abutting edge, and the axial displacement of the protective sleeve relative to the cylindrical body is displaced to the second clamping space. One card space. [Item 4]
The syringe for preventing accidental injury according to the first aspect of the invention, wherein the release positioning section is provided with a notch adjacent to the fastening portion. [Item 5]
The syringe for preventing accidental injury according to the first aspect of the invention, wherein the cylinder extends a baffle on a side of the moving direction of the pressing portion, and the baffle and the pressing portion sandwich a compression space. [Item 6]
The syringe for preventing accidental injury according to the first aspect of the invention, wherein a compression space is dug at a joint between a side end of the cylinder and the pressing portion. [Item 7]
The syringe for preventing accidental injury according to the first aspect of the invention, wherein the pressing portion extends a bump on a side of the moving direction, and the bump and the cylindrical body sandwich a compression space. [Item 8]
The syringe for preventing accidental injury according to claim 1, wherein the release positioning section axially spans the annular protrusion, and the thickness of the release positioning section is lower than the thickness of the card fixing section. [Item 9]
The anti-injury syringe according to the first aspect of the invention, wherein the positioning clip further has a limiting member extending from the side of the fulcrum connecting portion toward the clamping portion toward the fixing portion, the ring The protruding portion is disposed between the locking portion, the receiving portion and the limiting member, and the release positioning portion is corresponding to the width of the limiting member and penetrates the annular protrusion. [Item 10]
The anti-injury syringe according to the first aspect of the invention, wherein the positioning clip further has a limiting member extending from the side of the fulcrum connecting portion toward the clamping portion toward the fixing portion, the ring The protruding portion is disposed between the locking portion, the receiving portion and the limiting member, and the axial length of the releasing positioning portion is corresponding to the limiting member, and the axial width of the releasing positioning portion is correspondingly locked And passing through the annular protrusion, and the release positioning portion is disposed at the end of the annular protrusion near the through end.