CN216455168U

CN216455168U - Clip applier

Info

Publication number: CN216455168U
Application number: CN202122532933.3U
Authority: CN
Inventors: 孙宝峰; 刘越
Original assignee: Fengh Medical Co ltd
Current assignee: Fengh Medical Co ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-05-10
Anticipated expiration: 2031-10-20

Abstract

The utility model discloses a clip applier. The clip applier comprises: a handle portion; a sleeve having a proximal end drivingly connected to the handle portion; the connecting rod is accommodated in the sleeve, and the near end of the connecting rod is connected with the handle part; the clamp head is rotatably connected with the far end of the connecting rod and used for clamping and closing the ligation clamp, and the handle part can drive the sleeve to move so as to enable the clamp head to be closed or opened; the manual reset structure, manual reset structure set up in handle portion, and manual reset structure and sleeve pipe are operable to be cooperated, and the motion of manual reset structure can drive the sleeve pipe and move to the near-end to make the binding clip open, solved among the prior art the unable normal use's when the binding clip is blocked problem.

Description

Clip applier

Technical Field

The utility model relates to the technical field of surgical instruments, in particular to a clip applier.

Background

A clip applier is a surgical instrument that can grasp and close a ligating clip during laparoscopic surgery. Inside the pincers of executing can stretch into human body from less incision, the cooperation peritoneoscope observes the inside operation position of human body, then the adjustment pincers of executing the pincers head position, lets the ligature clamp aim at the blood vessel, and the closed handle portion of rethread drives the closed ligature clamp of binding clip head.

Generally, the application method of the clip applier is as follows: the handle part is tightly held, and the sleeve of the clip applier moves towards the far end, so that part of clip heads enter the sleeve and the clip mouth is closed; the handle part is loosened, the sleeve of the clip applier moves towards the proximal end, so that the clip head entering the sleeve is separated from the sleeve, and the clip head can be opened. However, in the using process of the clip applier, after the sleeve moves towards the far end to close the clip head, the existing automatic reset structure cannot drive the sleeve to return, so that the clip head cannot be opened. That is, in the opening process of the binding clip, when the binding clip is in a half-open state, the binding clip does not completely withdraw from the sleeve at the moment, the sleeve is clamped between the sleeve and the binding clip, and the sleeve cannot move towards the near end any more, so that the binding clip cannot be opened, the normal use of the clip is affected, and the organs or tissues of the human body are easily injured accidentally.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a clip applier, which solves the problem that the clip applier in the prior art cannot be normally used when the clip head is clamped.

The utility model is realized by the following technical scheme:

a clip applier, comprising:

a handle portion;

a sleeve having a proximal end drivingly connected to the handle portion;

the connecting rod is accommodated in the sleeve, and the near end of the connecting rod is connected with the handle part;

the forceps head is rotatably connected with the distal end of the connecting rod and used for clamping and closing the ligation clip, and the handle part can drive the sleeve to move so as to enable the forceps head to be closed or opened;

a manual reset feature disposed on the handle portion, the manual reset feature operably cooperating with the cannula; the manual reset structure moves to drive the sleeve to move towards the near end, so that the forceps head is opened.

Preferably, the manual reset structure includes a moving member having a first position and a second position, at least a portion of the moving member being operatively engaged with the sleeve; the moving piece can move from the first position to the second position so as to drive the sleeve to move towards the near end to enable the tong head to be opened.

Further preferably, the moving member includes:

a moving portion provided to the handle portion and movable relative to the handle portion;

a connecting portion connected with the moving portion, the connecting portion being operatively mated with the sleeve; in response to the force applied to the moving part, the moving part moves towards the proximal end, and the connecting part is driven to move towards the proximal end so as to drive the sleeve to move towards the proximal end.

Further preferably, the manual reset structure further comprises a connecting tube, the connecting tube is connected with the proximal end of the sleeve, and the connecting part is operatively matched with the connecting tube; in response to the force applied to the moving part, the moving part moves towards the near end, and drives the connecting part and then drives the connecting pipe and the sleeve to move towards the near end.

Preferably, a stopping structure is arranged between the connecting part and the connecting pipe, and after the connecting part moves towards the near end by a first preset distance, the stopping structure enables the connecting part to be matched with the connecting pipe, so that the connecting part drives the connecting pipe and the sleeve to move towards the near end.

Further preferably, the connecting pipe has an annular rib, and the stopper structure includes the annular rib.

Preferably, when the moving member is located at the first position and the binding clip is in the open state, a second preset distance is formed between the connecting portion and the annular rib, and the second preset distance is greater than the first preset distance.

Preferably, the manual reset structure further comprises a pin shaft, the pin shaft is arranged on the handle portion, and the pin shaft penetrates through the moving member so that the moving member can move along the pin shaft.

Preferably, the manual reset structure further comprises an elastic member, one end of the elastic member abuts against the moving member, and the other end of the elastic member abuts against the handle portion, so that when the moving member moves to the second position, the elastic member can provide a force for returning the moving member to the first position.

Preferably, a stopping structure is arranged between the connecting part and the sleeve, and after the connecting part moves towards the near end by a first preset distance, the stopping structure enables the connecting part to be matched with the sleeve so that the connecting part drives the sleeve to move towards the near end.

Compared with the prior art, the utility model has the beneficial effects that: through set up manual reset structure on handle portion, block and when unable automatic re-setting when binding clip and sleeve pipe, through manual control manual reset structure, can drive the sleeve pipe and remove to the near-end to make binding clip and sleeve pipe relieve the state of blocking, the binding clip can normally be opened, makes the user can in time and conveniently handle the trouble that the pincers of executing blocked, has guaranteed the normal use of the pincers of executing, avoids human organ or tissue to receive accidental injury.

Drawings

FIG. 1 is a schematic structural view of a clip applier provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a clip applier provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a clip applier provided in accordance with an embodiment of the utility model, without a handle portion;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

fig. 5 is a partial sectional view of a manual reset feature provided in accordance with an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the terms "proximal" and "distal" are used herein with respect to a clinician manipulating a clip applier. The term "proximal" refers to the portion that is closer to the clinician, while the term "distal" refers to the portion that is further from the clinician. I.e., the end near the handle portion 10 is the proximal end and the end near the binding clip 40 is the distal end. However, clip appliers may be used in many orientations and positions, and thus these terms of relative positional relationship are not intended to be limiting and absolute.

In the present invention, unless otherwise explicitly stated or limited, the terms "connected" and "connected" are to be understood broadly, and may be, for example, fixedly connected, detachably connected, movably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship, such as abutment. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. It is to be noted that, when a definite term is used before "connected" or "connected", it has the meaning defined by the corresponding definite term, only excluding the case where it is obviously necessary to exclude, and not excluding other possible cases, for example, "detachably connected" means detachably connected, not integrally included, but movable connected, etc. are not excluded.

Referring to fig. 1 to 3, the present embodiment provides a clip applier, which includes a handle 10, a sleeve 20, a connecting rod 30, a clip head 40 and a manual reset structure. The proximal end of the sleeve 20 is drivably connected to the handle portion 10. The connecting rod 30 is housed in the sleeve 20 and a proximal end of the connecting rod 30 is connected to the handle portion 10. A jaw 40 is rotatably coupled to a distal end of the connecting rod 30, the jaw 40 being adapted to grip and close the ligation clip. The handle portion 10 can drive the sleeve 20 to move along the axial direction of the sleeve 20, so that the binding clip 40 can enter the sleeve 20 from the distal end of the sleeve 20 or disengage the sleeve 20 from the distal end of the sleeve 20, so that the binding clip 40 can be closed or opened. Specifically, the binding clip 40 comprises two arms pivotally connected to the connecting rod 30, and a spring is provided between the two arms, such that when the handle portion 10 drives the sleeve 20 to move distally along the axial direction of the sleeve 20, the distal end of the sleeve 20 can cooperate with the binding clip 40 to press the binding clip 40, such that the binding clip 40 is closed and accommodated in the sleeve 20, and the spring is compressed. When the handle portion 10 drives the sleeve 20 to move proximally in the axial direction of the sleeve 20, the jaw 40 is disengaged from the sleeve 20, the sleeve 20 releases the action on the jaw 40, and the spring releases energy to open the jaw 40.

A manual reset mechanism is movably disposed on the handle portion 10, and the manual reset mechanism is connected to the proximal end of the sleeve 20, and the manual reset mechanism can move the sleeve 20 to the proximal end to open the binding clip 40.

In the present embodiment, the clip applier may be a manual clip applier or an electric clip applier. That is, the manual reset structure in the present embodiment can be applied to both manual and electric clip appliers.

In the present embodiment, the handle portion 10 includes a fixed handle and a rotating handle. The stationary handle remains stationary for contact with the palm of the user's hand and the rotating handle is rotatably connected to the stationary handle and drivably connected to the sleeve 20. When the user grasps the handle portion 10, the rotating handle rotates in a direction approaching the fixed handle, thereby moving the sleeve 20 distally, and the binding clip 40 gradually enters the sleeve 20 to close, thereby closing the ligation clip. Then, the user releases the handle portion 10, and the rotating handle is driven by the automatic reset mechanism to rotate in a direction away from the fixed handle due to the automatic reset mechanism provided in the handle portion 10, so as to drive the sleeve 20 to move towards the proximal end, and the forceps head 40 gradually withdraws from the sleeve 20 to be opened.

In the present embodiment, the moving direction of the manual reset mechanism is parallel to the axial direction of the sleeve 20. That is, when the pliers head 40 is engaged with the sleeve 20, the user moves the manual reset mechanism proximally in the same direction as the sleeve 20 moves when the pliers head 40 is opened, which means that the manual reset mechanism moves the sleeve 20 proximally, thereby opening the pliers head 40. This allows for a simple structure of connection between the manual reset mechanism and the cannula 20 for easy identification and use by the user. Of course, the moving direction of the manual reset structure may be other directions as long as the sleeve 20 can be driven to move towards the proximal end, and the direction can be selected according to actual requirements, for example, the manual reset structure adopts a slope fit or other modes to realize direction conversion, so that the moving direction of the manual reset structure is not parallel to the moving direction of the sleeve.

Referring to fig. 1-3, the clip applier further includes a rotation structure 90. The rotating structure 90 is disposed at the proximal end of the sleeve 20 and is drivingly connected to the connecting rod 30. The rotating structure 90 can drive the connecting rod 30 to rotate coaxially, and further drive the forceps head 40 to rotate, so as to adjust the angle of the forceps head 40 according to the specific position of the blood vessel, and align the jaws of the forceps head 40 to the blood vessel to be ligated. Specifically, the outer surface of the rotating structure 90 is provided with a plurality of contact recesses at intervals in the circumferential direction, which is convenient for a user to grip and rotate the rotating structure 90.

Referring to fig. 1, the manual reset structure includes a moving member 50. The moving member 50 has a first position and a second position, at least a portion of the moving member 50 extends into the handle portion 10 and is connected to the sleeve 20, and the moving member 50 can move from the first position to the second position along a direction parallel to the axial direction of the sleeve 20 to drive the sleeve 20 to move proximally to open the binding clip 40. Of course, the moving direction of the moving member 50 may be other directions, in which case the moving member 50 also has a first position and a second position, and the moving member 50 can move from the first position to the second position in other directions to move the sleeve 20 proximally to open the forceps head 40.

Specifically, the handle portion 10 has an opening extending along the axial direction of the sleeve 20, at least a portion of the moving member 50 extends into the opening to be connected to the sleeve 20, and the moving member 50 can move from the distal end of the opening to the proximal end of the opening to move the sleeve 20 proximally. That is, the first position is at the distal end of the opening and the second position is at the proximal end of the opening. In this embodiment, the moving member 50 includes a toggle button, and an outer portion of the toggle button is exposed to an outer surface of the handle portion 10 for pushing by a user. The initial position of the toggle button is at the distal end of the opening, and when moving member 50 is moved proximally to the proximal end of the opening, the user pushes moving member 50 proximally, and when moving member 50 is moved proximally to the proximal end of the opening, jaw 40 is just out of the way of sleeve 20 and opens, i.e., the length of the opening corresponds to the distance that sleeve 20 needs to move when jaw 40 is open.

Referring to fig. 3 to 4, the moving member 50 includes a moving portion 51 and a connecting portion 52 connected to the moving portion 51. The moving portion 51 is provided to the handle portion 10 and is movable relative to the handle portion 10. The connecting portion 52 extends from the moving portion 51 toward the handle portion 10, the connecting portion 52 extends into the handle portion 10 and is connected to the sleeve 20, the moving portion 51 moves proximally in response to a force applied to the moving portion 51, and the connecting portion 52 moves proximally to move the sleeve 20 proximally. Specifically, the connecting portion 52 extends into the handle portion 10 through the opening.

In the present embodiment, the moving portion 51 has a pointed projection rising in a direction away from the handle portion 10, the pointed projection is located between the distal end and the proximal end of the moving portion 51, and the outer surface between the distal end of the moving portion 51 and the tip of the pointed projection is an arc-shaped surface adapted to the fingertip of a human finger. Similarly, the outer surface between the proximal end of the moving part 51 and the tip of the pointed projection is an arc-shaped surface adapted to the tip of a human finger. Through the arrangement, the fingers of the user can be matched with the outer surface of the moving part 51, so that the moving part 50 can be conveniently and laborsavingly pushed.

Referring to fig. 2 to 5, the manual reset structure further includes a connection tube 60. The distal end of the connecting tube 60 is connected to the proximal end of the cannula 20, and the connecting portion 52 is operatively engaged with the connecting tube 60 to move the connecting tube 60 and the cannula 20 proximally. In the present embodiment, most of the connection tube 60 is accommodated in the rotation structure 90, and the proximal end of the connection tube 60 extends out of the rotation structure 90 to be operatively engaged with the connection portion 52, and specifically, the connection tube 60 and the connection portion 52 have a corresponding stopping structure therebetween, which enables the connection portion 52 and the connection tube 60 to be operatively engaged. Referring to fig. 4, a corresponding stopping structure is provided between the connecting portion 52 and the connecting tube 60, after the connecting portion 52 moves a first predetermined distance to the proximal end, the stopping structure makes the connecting portion 52 abut against the connecting tube 60, so that a matched limit stop can be formed between the connecting portion 52 and the connecting tube 60, and the moving member 50 drives the connecting tube 60 to move to the proximal end through the connecting portion 52, and further drives the sleeve 20 to move to the proximal end, so as to open the forceps head 40.

Specifically, the link 52 includes a link body 521 and a push plate 522. The connecting portion body 521 is connected to the moving portion 51. The push plate 522 includes a first position-limiting portion 5221 and a second position-limiting portion 5222. The first and

second stopper portions

5221 and 5222 are connected. The connecting portion body 521 has a limiting groove, and at least a portion of the first limiting portion 5221 extends into the limiting groove. A stopping structure is arranged between the second limiting portion 5222 and the connecting pipe 60, so that the second limiting portion 5222 and the connecting pipe 60 can be operatively matched with each other, after the moving member 50 moves towards the proximal end by a first preset distance, the stopping structure enables the second limiting portion 5222 to abut against the connecting pipe 60, and therefore a limiting stop can be formed between the second limiting portion 5222 and the connecting pipe 60, so that the second limiting portion 5222 and the connecting pipe 60 can be matched with each other, the moving member 50 drives the connecting pipe 60 to move towards the proximal end through the push plate 522, and further drives the sleeve 20 to move towards the proximal end, so that the tong head 40 is opened.

Referring to fig. 3 to 4, the proximal end of the connecting tube 60 has an annular rib 61, the second limiting portion 5222 is an arc shape adapted to the connecting tube 60, and the second limiting portion 5222 is sleeved on the outer wall of the connecting tube 60 and can move along the connecting tube 60. The second position-limiting portion 5222 and the annular rib 61 can form a position-limiting stop. That is, the second stopper portion 5222 of the connecting portion 52 and the annular rib 61 on the connecting tube 60 constitute a stopper structure between the connecting portion 52 and the connecting tube 60.

When the binding clip is stuck with the sleeve, the user pushes the moving portion 51 towards the proximal end, the second limiting portion 5222 moves towards the proximal end along with the moving portion 51, and after the second limiting portion 5222 moves for a first preset distance, the second limiting portion 5222 contacts and stops the annular rib 61 at the proximal end of the connecting pipe 60, and the second limiting portion 5222 continues to move towards the proximal end, so as to drive the connecting pipe 60 to move towards the proximal end, and further drive the sleeve 20 to move towards the proximal end.

In the present embodiment, when the moving member 50 is located at the first position and the pincer head 40 is in the open state, the connecting portion 52 has a second preset distance from the annular rib 61. Thus, during normal use of the clip applier, when the sleeve 20 and the connecting tube 60 are moved together to the distal end to close the bit 40, the annular rib 61 of the connecting tube 60 does not contact the second position-limiting portion 5222, so as to prevent the second position-limiting portion 5222 from affecting the normal use of the clip applier. In operation, the clip applier is operated by moving sleeve 20 distally to close the jaws 40 and then moving sleeve 20 proximally to open the jaws 40. During the process of moving the sleeve 20 towards the proximal end, the sleeve 20 and the binding clip 40 may be jammed at any position, and at this time, a first predetermined distance is provided between the second limiting portion 5222 and the annular rib 61, and the second predetermined distance is greater than the first predetermined distance. The second position-limiting portion 5222 moves proximally by a first predetermined distance and then contacts and stops the annular rib 61 at the proximal end of the connecting tube 60.

Of course, the second position-limiting portion 5222 may also be a ring shape adapted to the connecting tube 60, and the second position-limiting portion 5222 is sleeved on the outer tube wall of the connecting tube 60, has the same position-limiting and stopping effect, and can be selected according to actual requirements.

Referring to fig. 3 to 5, the manual reset structure further includes a pin 70. A pin 70 is disposed in the handle portion 10, and the pin 70 passes through the connecting portion 52 to enable the moving member 50 to move along the pin 70. Specifically, the pin 70 is disposed corresponding to the opening, at least one end of the pin 70 is connected to the handle portion 10 so that the pin 70 is fixed in the handle portion 10, and preferably, both the proximal end and the distal end of the pin 70 are connected to the handle portion 10. The connecting portion body 521 has a first avoiding hole 5211, the first limiting portion 5221 has a second avoiding hole 52211 coaxially disposed with the first avoiding hole 5211, and the pin 70 sequentially passes through the first avoiding hole 5211 and the second avoiding hole 52211 so that the moving member 50 can move along the pin 70. Through the above arrangement, the pin shaft 70 can support the moving member 50, and can limit the moving direction of the moving member 50, so that the moving member 50 can move along the straight direction, and the deviation of the moving direction is avoided. Of course, the pin 70 may be provided outside the handle portion 10, and in this case, at least a part of the connecting portion body 521 of the connecting portion 52 extends outside the handle portion 10 to be connectable to the pin 70, and the pin 70 passes through the connecting portion body 521. Specifically, a corresponding fixing block is provided on the outside of the handle portion for fixing at least one end of the pin 70.

Referring to fig. 3 to 5, the manual reset structure further includes an elastic member 80. One end of the elastic member 80 abuts against the connecting portion 52, and the other end of the elastic member 80 abuts against the handle portion 10, so that when the moving member 50 moves to the second position in the proximal direction, the elastic member 80 can provide a force for the moving member 50 to return to the first position.

In this embodiment, the elastic member 80 is sleeved on the pin 70, one end of the elastic member 80 abuts against the connecting portion body 521, and the other end of the elastic member 80 abuts against the handle portion 10 at the proximal end of the pin 70. Through the arrangement, after the user moves the moving member 50 to the near end of the opening, the tong head 40 and the sleeve 20 are released from the clamping state, at the moment, under the action of the elastic member 80, the moving member 50 can return to the far end of the opening, namely the first position, along the pin shaft 70, so that the user can manually reset next time, at the moment, the sleeve 20 and the moving member 50 both return to the initial positions, the second limiting part 5222 keeps the second preset distance with the annular rib 61 of the connecting pipe 60 again, the annular rib 61 of the connecting pipe 60 cannot contact with the second limiting part 5222, and the influence on the normal use of the tong is avoided. In an embodiment, not shown, the connecting portion body 521 further has a third avoiding hole 5212, one end of the elastic member 80 passes through the third avoiding hole 5212 to abut against the first limiting portion 5221, and the other end of the elastic member 80 abuts against the handle portion 10 at the proximal end of the pin 70.

In an embodiment, not shown, the manual reset structure does not include the connection tube 60, the connection portion 52 is operatively engaged with the sleeve 20, and a corresponding stop structure is provided between the connection portion 52 and the sleeve 20, and after the moving member 50 moves proximally by a first preset distance, the connection portion 52 and the sleeve 20 form a limit stop, so that the moving member 50 can drive the sleeve 20 to move proximally. Specifically, the limit stopping manner between the connecting portion 52 and the sleeve 20 is the same as the limit stopping manner between the second limit portion 5222 and the connecting tube 60, and will not be described herein again.

In summary, according to the clip applier of the utility model, the manual reset structure is arranged on the handle portion 10, when the clip 40 is stuck with the sleeve 20 and the automatic reset is not possible, the manual reset structure is manually controlled to drive the sleeve 20 to move towards the proximal end, so that the clip 40 and the sleeve 20 are released from the stuck state, the clip 40 can be normally opened, a user can timely and conveniently handle the stuck failure of the clip applier, the normal use of the clip applier is ensured, and the accidental injury to human organs or tissues is avoided.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A clip applier, comprising:

a handle portion;

a sleeve having a proximal end drivingly connected to the handle portion;

2. The clip applier of claim 1, wherein said manual reset structure includes a moving member having a first position and a second position, at least a portion of said moving member being operatively engaged with said sleeve; the moving piece can move from the first position to the second position so as to drive the sleeve to move towards the near end to enable the tong head to be opened.

3. The clip applier of claim 2, wherein said mover comprises:

a connecting portion connected with the moving portion, the connecting portion being operatively engaged with the sleeve; in response to the force applied to the moving part, the moving part moves towards the proximal end, and the connecting part is driven to move towards the proximal end so as to drive the sleeve to move towards the proximal end.

4. The clip applier of claim 3, wherein said manual reset mechanism further comprises a connecting tube connected to a proximal end of said cannula, said connecting portion operatively engaged with said connecting tube; in response to the force applied to the moving part, the moving part moves towards the near end, and drives the connecting part and then the connecting pipe and the sleeve to move towards the near end.

5. The clip applier of claim 4, wherein a stop structure is disposed between said connector and said connector, and when said connector is moved proximally a first predetermined distance, said stop structure causes said connector to engage said connector such that said connector drives said connector and said sleeve to move proximally.

6. The clip applier of claim 5, wherein said connecting tube has an annular rib, and said stop structure comprises said annular rib.

7. The clip of claim 6, wherein when the moveable member is in the first position and the clip is in the open position, the connecting portion is a second predetermined distance from the annular rib, the second predetermined distance being greater than the first predetermined distance.

8. The clip applier of claim 2, wherein said manual reset mechanism further comprises a pin disposed on said handle portion, said pin passing through said movable member to enable said movable member to move along said pin.

9. The clip applier of claim 2, wherein said manual return structure further comprises a resilient member, one end of said resilient member abutting said movable member and the other end of said resilient member abutting said handle portion, whereby said resilient member is capable of providing a force to said movable member to return to said first position when said movable member is moved to said second position.

10. The clip applier of claim 3, wherein a stop structure is disposed between the connecting portion and the sleeve, and when the connecting portion moves proximally by a first predetermined distance, the stop structure causes the connecting portion to cooperate with the sleeve such that the connecting portion drives the sleeve to move proximally.