CN112998823B

CN112998823B - Integrated puncture perfusion catheter for perfusion of abdominal organ transplantation donor

Info

Publication number: CN112998823B
Application number: CN202110292329.XA
Authority: CN
Inventors: 黄昌浩; 周卧龙
Original assignee: Xiangya Hospital of Central South University
Current assignee: Xiangya Hospital of Central South University
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-06-17
Anticipated expiration: 2041-03-18
Also published as: CN112998823A

Abstract

The invention discloses an integrated puncture perfusion catheter for perfusion of an abdominal organ transplant donor, wherein one end of the integrated puncture perfusion catheter is provided with a puncture part, the puncture part comprises a puncture piece, an accommodating channel and a retraction assembly capable of controlling the puncture piece to retract into the accommodating channel, the puncture piece is arranged in the accommodating channel and can stretch into and out of the accommodating channel, and the retraction assembly is connected with the puncture piece. The invention has the advantages of convenient operation, good puncture effect, blood splashing prevention, injury prevention to intima of blood vessels, effective improvement of perfusion efficiency, guarantee of the quality of donor organs and the like.

Description

Integrated puncture perfusion catheter for perfusion of abdominal organ transplantation donor

Technical Field

The invention relates to the technical field of organ transplantation donor surgical instruments, in particular to an integrated puncture perfusion catheter for perfusion of an abdominal organ transplantation donor.

Background

When donor operations donated to abdominal organs (such as liver, kidney, pancreas, small intestine and the like) are performed, an abdominal organ perfusion system needs to be established as soon as possible, the central temperature of a target organ is rapidly reduced through efficient perfusion, so that the warm ischemia time of the target organ is reduced, the success rate of transplantation operations is improved, and meanwhile, perfusion fluid needs to be prevented from flowing into unnecessary organs. The current surgical methods are as follows: firstly, exposing an abdominal aorta below an superior mesenteric artery, ligating a distal aorta, threading a proximal aorta, cutting a wall of the proximal aorta, then placing an adult catheter (the front end of the catheter is ligated before an operation, and a plurality of side holes are cut on a wall of a balloon back side), and placing the catheter into a depth to enter a thoracic aorta, wherein the operation is usually held by the experience of an operator; then the catheter saccule is filled with water, the pipeline is initially fixed, the perfusion liquid is reduced to flow into the thoracic aorta, in addition, the near-end suture of the puncture hole is used for reinforcing and fixing the catheter, and attention should be paid to the appropriate knotting tightness of the suture to avoid the catheter from being pricked and closed.

The abdominal aorta needs to be cut firstly in the process of placing the catheter in an operation, the abdominal aorta is often overhigh in blood pressure during the operation, and part of donors have aorta sclerosis, so blood splashes after the incision, the blood is easily sprayed into the abdominal cavity, and the operation visual field is fuzzy, so two surgeons are needed to be closely matched in the process of placing the catheter, the operation is complex, the possibility of repeatedly placing the catheter for many times or even the failure of placing the catheter exists, a large amount of bleeding influences the next operation, and the perfusion efficiency of donor organ perfusate and the quality of organs are seriously influenced.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects in the prior art and provide the integrated puncture perfusion catheter for perfusion of the abdominal organ transplant donor, which is convenient to operate, has a good puncture effect, avoids blood splashing, prevents injury to intima of blood vessels, effectively improves perfusion efficiency and ensures donor organ quality.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the utility model provides an integral type puncture perfusion catheter for abdominal organ transplantation donor perfusion, the one end of integral type puncture perfusion catheter is equipped with puncture portion, puncture portion includes puncture piece, holding passageway and steerable puncture piece retracts to the subassembly that rolls back in the holding passageway, puncture piece locates in the holding passageway and scalable business turn over holding passageway, it links to each other with puncture piece to roll back the subassembly.

Preferably, one end of the puncture piece is provided with a puncture tip, the other end of the puncture piece is provided with a matching part matched with the retraction assembly, and the retraction assembly comprises a retraction spring driving the puncture piece to retract into the accommodating channel and an excitation part matched with the matching part to enable the puncture piece to extend out of the accommodating channel.

Foretell an integral type puncture perfusion catheter for abdominal organ transplantation donor is perfused, it is preferred, the puncture point is the sunken shovel column structure in middle part, cooperation portion is the inclined plane form, is equipped with the connecting rod between puncture point and the cooperation portion, the one end of arousing the portion be equipped with the inclined plane of cooperation portion matching, the other end is equipped with arouses the button, still is equipped with the reset spring that is used for ordering about the arousing portion and keeps away from the cooperation portion in the arousing portion.

Preferably, the outer part of the puncture part is in a streamline cambered surface shape, and the accommodating channel is arranged obliquely to the length direction of the integrated puncture perfusion catheter.

Preferably, the puncture part is provided with a limiting part for preventing the excitation part from protruding out of the outer surface of the puncture part, and the excitation part is in smooth transition with the streamline cambered surface-shaped outer surface of the puncture part under the limiting action of the limiting part.

The above-mentioned an integral type puncture perfusion catheter for abdominal organ transplantation donor perfusion, preferably, the middle part of excitation portion through a pivot pin joint in the puncture portion, excitation portion one end is equipped with the spacing hook that the restriction puncture piece rolled back, and the other end is equipped with and relieves the button of spacing hook limiting displacement, be equipped with the torsional spring that orders about spacing hook and be in spacing state on the pivot.

Preferably, the other end of the integrated puncture perfusion catheter is provided with a perfusion part, and the perfusion part is fixedly connected with the puncture part and is not communicated with the interior of the puncture part.

Foretell an integral type puncture perfusion catheter for abdominal organ transplantation donor perfusion, it is preferred, the one end of portion of infusing is sealed, and the other end is equipped with the mouth of infusing that can carry the perfusate towards the cavity inner chamber of portion of infusing, be equipped with two and can fill formula water pockets in the portion of infusing, two can fill formula water pocket interval arrangement, and be equipped with the perfusate export on the pipe wall of the portion of infusing between two can fill formula water pockets.

Preferably, the perfusion part is provided with a water filling channel for filling the water filling type water bag with water, one end of the water filling channel is communicated with the water filling type water bag, the other end of the water filling channel is provided with a water filling port, the water filling port is provided with a non-return mechanism for preventing liquid in the water filling type water bag from flowing backwards, and the water filling channels of the two water filling type water bags are mutually independent.

Preferably, the perfusion part is provided with an annular water bag groove, and the chargeable water bag is arranged in the annular water bag groove and does not exceed the annular water bag groove when not filled with water.

Preferably, the perfusion part is made of pressure-resistant plastic or rubber.

Compared with the prior art, the invention has the advantages that:

the integrated puncture perfusion catheter of the invention adopts an integrated structure of the puncture part and the perfusion part, the puncture part punctures the abdominal aorta to avoid blood splashing, because of adopting an integrated structure, the perfusion part can be smoothly placed into the abdominal aorta along with the puncture part to construct a perfusion system, meanwhile, the puncture part is provided with a retraction component which is convenient for retracting and protecting the puncture piece after puncture, so that the injury to the opposite abdominal aorta is avoided during implantation, can rapidly, efficiently and safely carry out abdominal aorta puncture and construct a perfusion system, greatly reduce the time for establishing the aorta perfusion system, reduce the damage of tissue ischemia reperfusion, improve the quality of donor organs, shorten the operation time, reduce the operation difficulty, avoid the problem that the artery perfusion effect is influenced because the catheterization is easy to fail due to the cooperation of a plurality of people, the perfusion fluid can be perfused to the donor organ to the maximum extent, and the risk of donor blood splashing to the operating doctor is also avoided.

Drawings

Fig. 1 is a schematic perspective view of the integrated puncture irrigation catheter of embodiment 1 (the water-filled bag is not filled with water).

Fig. 2 is a schematic perspective view of the integrated puncture irrigation catheter of embodiment 1 (water-filled state of the water-filled bladder).

Fig. 3 is a sectional view of the integrated puncture irrigation catheter of example 1 (water-filled bladder filling state).

Fig. 4 is a partially enlarged view of a in fig. 3.

Fig. 5 is a schematic perspective view of the puncture device in example 1.

Fig. 6 is a cross-sectional view of the integrated puncture irrigation catheter of example 2 (water-filled bladder filling state).

Fig. 7 is a partially enlarged view of B in fig. 6.

Illustration of the drawings:

1. a puncture section; 11. a piercing member; 111. a puncture tip; 112. a fitting portion; 113. a connecting rod; 12. an accommodating channel; 13. a fallback component; 131. a retraction spring; 132. an excitation section; 133. a return spring; 134. a limiting part; 135. a torsion spring; 2. a pouring section; 21. an infusion port; 22. a water bag capable of being filled; 23. a perfusate outlet; 24. a water filling channel; 25. a water filling port; 26. an annular water sac groove.

Detailed Description

In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

Example 1:

as shown in fig. 1 and fig. 2, one end of the integrated puncture perfusion catheter of the present embodiment is provided with a puncture part 1, the other end is provided with a perfusion part 2, the perfusion part 2 is fixedly connected with the puncture part 1 and the inside is not communicated, and the puncture part 1 and the perfusion part 2 form an integrated puncture perfusion catheter.

As shown in fig. 3 and 4, in the present embodiment, the puncturing part 1 includes a puncturing element 11, a receiving channel 12 and a retraction assembly 13 for controlling the puncturing element 11 to retract into the receiving channel 12, the puncturing element 11 is disposed in the receiving channel 12 and can telescope in and out of the receiving channel 12, and the retraction assembly 13 is connected to the puncturing element 11. Puncture piece 11 plays the effect of puncturing the blood vessel, and scalable business turn over holding channel 12, corresponding holding channel 12 plays the effect of holding puncture piece 11, when needs puncture the blood vessel, puncture piece 11 stretches out from holding channel 12, play the effect of puncturing the blood vessel, after accomplishing the puncture, need put into the blood vessel with integral type puncture perfusion catheter is whole, in order to avoid damaging the blood vessel intima, need to retract puncture piece 11 into holding channel 12, so that the smooth leading-in of integral type puncture perfusion catheter, and it operates according to actual conditions to roll back subassembly 13 and be convenient for the art person.

In this embodiment, one end of the puncturing member 11 is provided with a puncturing tip 111, and the other end is provided with a matching portion 112 for matching with the retraction assembly 13, and the retraction assembly 13 includes a retraction spring 131 for driving the puncturing member 11 to retract into the accommodating channel 12 and an activating portion 132 for matching with the matching portion 112 to extend the puncturing member 11 out of the accommodating channel 12. The puncture tip 111 is specifically used for puncturing a blood vessel, the matching part 112 is mainly matched with the excitation part 132 to respond to the operation of the excitation part 132 so as to flexibly control the stretching action of the puncture tip 111, and the retraction spring 131 provides retraction force so that the puncture tip 111 cannot extend out to accidentally injure a user without the influence of other external force.

As shown in fig. 5, in this embodiment, the puncturing tip 111 is a shovel-shaped structure with a concave middle portion, the matching portion 112 is an inclined surface, a connecting rod 113 is disposed between the puncturing tip 111 and the matching portion 112, an inclined surface matching with the matching portion 112 is disposed at one end of the exciting portion 132, an exciting button is disposed at the other end of the exciting portion 132, and a return spring 133 for driving the exciting portion 132 to be away from the matching portion 112 is further disposed on the exciting portion 132. The puncture tip 111 is specifically a metal blade piece, is in an engineer shovel shape, is downward concave in the middle, is slightly upwarped on two sides, and is gradually contracted from two sides to form a flat and sharp blade at the front end; connecting rod 113 plays the effect of transmission power, arouses portion 132 and cooperation portion 112 to get up more accurate flexibility through the inclined plane cooperation control, when pressing the excitation button, and the whole forward propulsion of puncture piece 11 is outside outstanding main part, sets up reset spring 133 and guarantees that no exogenic action down puncture point 111 can not stretch out, prevents to damage contralateral aorta wall and medical staff.

In this embodiment, the exterior of the puncture part 1 is in the shape of a streamline arc, and the accommodating channel 12 is inclined to the length direction of the integrated puncture perfusion catheter. It is specific, 1 main part of puncture portion is the plastics material, specifically be glossy locomotive shape, so that subsequent portion of pouring 2 slips into the aorta opening by 1 thorn of puncture portion, the front end is equipped with opening and holding passageway 12 intercommunication, except holding passageway 12 and the space that holds back subassembly 13, other parts are solid construction in the puncture portion 1, play the skeleton supporting role, simultaneously in order to avoid too much blood to gush into or the blowout, holding passageway 12 plays upwards setting from the most advanced of puncture portion 1, inclination is 30, so puncture 11 also sets up with this mode, the slope sets up not only is favorable to vascular puncture, be convenient for simultaneously pour into the pipe with the integral type puncture and wholly put into in the blood vessel so that carry out subsequent operation of pouring.

In this embodiment, the puncturing part 1 is provided with a stopper 134 for preventing the excitation part 132 from protruding from the outer surface of the puncturing part 1, and the excitation part 132 smoothly transits to the streamline arcuate outer surface of the puncturing part 1 under the stopper action of the stopper 134. It is specific, the one end that excitation portion 132 is close to the excitation button is equipped with outstanding ear, thereby spacing portion 134 can restrict outstanding ear and pass through and avoid the whole surface that extrudes puncture portion 1 of transition of excitation portion 132, in order to prevent to put into the back injury blood vessel intima, in addition when no external force presses the excitation button, the top of excitation button and the outside smooth transition of puncture portion 1, so that the whole body that makes the integral type puncture perfusion catheter can smoothly put into, avoid from inboard laceration or hanging injury blood vessel intima and influence the perfusion effect, thereby lead to the quality reduction of donor's organ.

In this embodiment, one end of the filling part 2 is closed, the other end of the filling part is provided with a filling port 21 capable of conveying a filling liquid towards the hollow inner cavity of the filling part 2, the filling part 2 is provided with two inflatable water bags 22, the two inflatable water bags 22 are arranged at intervals, and a filling liquid outlet 23 is arranged on the pipe wall of the filling part 2 between the two inflatable water bags 22. Specifically, the front end of the perfusion part 2 is sealed and is not communicated with the puncture part 1, therefore, blood can not spill out from the perfusion part 2, simultaneously under the guide of the streamline type puncture part 1, the perfusion part 2 can be smoothly placed into an abdominal aorta, two inflatable water bags 22 are 15cm apart (the distance between the two inflatable water bags 22 can be adjusted along with the height of a donor, thereby various specifications are set), perfusate can enter an inner cavity of the perfusion part 2 from the perfusion opening 21, and then flows out from the perfusate outlet 23 to perform high-efficiency perfusion of an appointed donor organ.

In this embodiment, the filling part 2 is provided with a water filling passage 24 for filling the water-filled water bag 22 with water, one end of the water filling passage 24 is communicated with the water-filled water bag 22, the other end is provided with a water filling opening 25, a non-return mechanism for preventing the liquid in the water-filled water bag 22 from flowing back is arranged at the water filling opening 25, and the water filling passages 24 of the two water-filled water bags 22 are independent from each other. Specifically, the check mechanism is a check valve which is closed in a natural state to prevent the liquid in the inflatable water bag 22 from flowing backwards, the liquid can expand the check mechanism at the water filling port 25 after being connected with the injector to fill the inflatable water bag 22, the inflatable water bag 22 can be inflated to a diameter of 3-5cm after being filled with water, the water filling amount of the inflatable water bag 22 can be adjusted to adapt to different donors according to specific conditions, the two inflatable water bags 22 are independently provided with the water filling channels 24 to facilitate independent accurate adjustment of the inflatable water bags 22 according to the conditions, the pressure reducing bag is arranged at the inlet of the water filling port 25, the inflatable water bag 22 at the front end can block the perfusion liquid from flowing to the thoracic aorta and the upper limbs blood vessels after being filled, the inflatable water bag 22 at the rear end can block the perfusion liquid from flowing to the common iliac arteries and the lower limbs after being filled, thereby ensuring the effective perfusion of abdominal organs to be obtained, such as the liver, kidney, pancreas, small intestine, etc.

In this embodiment, the filling part 2 is provided with an annular water bag groove 26, the water bag 22 is disposed in the annular water bag groove 26, and the water bag 22 does not exceed the annular water bag groove 26 when not filled with water. The annular water bag groove 26 for accommodating the water bag 22 can prevent the water bag 22 from protruding when water is not filled, so that the filling part 2 can be conveniently placed in the annular water bag groove, and the water bag 22 is prevented from being difficult to fully open or damage due to wrinkles formed by friction when the water bag is placed in the annular water bag groove.

In this embodiment, the outer wall of the pouring section 2 near the pouring port 21 is provided with an indication scale for displaying the insertion depth. The indication scale makes the operator clearly see the whole embedded depth, thereby being convenient for operation.

The application method of the embodiment is as follows: before use, the sealing performance and the passing performance of the pouring part 2 are routinely checked, and whether water can be smoothly injected is judged; after the abdominal cavity is opened, finding the abdominal aorta at the root of the mesentery, opening the peritoneum, and exposing the abdominal aorta; pressing the activating button of the activating part 132, the inclined plane of the activating part 132 pushes the inclined plane of the matching part 112 of the puncturing part 11, so that the puncturing tip 111 protrudes from the accommodating channel 12 to protrude out of the main body, selecting a proper angle and position (inclined at an angle of 30 degrees) to puncture and cut the abdominal aorta wall towards the proximal end, releasing the activating button after the front end of the puncturing part 1 completely enters the abdominal aorta, retracting the puncturing tip 111 into the accommodating channel 12 to prevent the opposite aorta wall from being damaged, continuing to push the integrated puncturing perfusion catheter towards the proximal end until a designated marking line, sequentially injecting water into the inflatable water bag 22 at the proximal end and the inflatable water bag 22 at the distal end, connecting a perfusion fluid pushing device, completing the construction of a perfusion system, injecting perfusion fluid into the perfusion opening 21, and allowing the perfusion fluid to flow out from the perfusion fluid outlet 23 so as to complete the perfusion of the donor organ.

Example 2:

this embodiment is basically the same as embodiment 1, and mainly differs in the structure of the puncturing part 1: as shown in fig. 6 and 7, in this embodiment, the puncturing part 1 is a cylindrical structure, the cylindrical cavity at the front end is a receiving channel 12 for receiving an i-shaped puncturing element 11, one end of the puncturing element is a sharp solid cylinder with an inclined plane as a puncturing tip 111, the middle is a connecting rod 113, the engaging part 112 at the other end is a baffle, the retraction spring 131 abuts against one side of the baffle, and the other side of the baffle is engaged with the excitation part 132.

In this embodiment, the middle of the excitation portion 132 is pivotally connected to the puncturing part 1 through a pivot, one end of the excitation portion 132 is provided with a limiting hook for limiting the retraction of the puncturing element 11, the other end of the excitation portion is provided with a button for releasing the limiting effect of the limiting hook, and the pivot is provided with a torsion spring 135 for driving the limiting hook to be in a limiting state. Puncture point 111 salient outside puncture portion 1 major structure, play the effect of puncture and cutting the aorta wall, spacing hook has restricted the action of rolling back of puncture piece 11 this moment, consequently can normally carry out the puncture work, after accomplishing the puncture, in order to avoid damaging contralateral aorta wall protection inner membrance, the whole of the integral type puncture perfusion catheter of being convenient for simultaneously is put into, press the button and relieve the limiting displacement of spacing hook, it provides the power of rolling back to roll back spring 131 makes puncture piece 111 retract in holding passageway 12, owing to there is torsional spring 135, consequently can not trigger the action of rolling back when not pressing the button.

The application method of the embodiment is as follows: before use, the sealing performance and the passing performance of the pouring part 2 are routinely checked, and whether water can be smoothly injected is judged; after the abdominal cavity is opened, finding the abdominal aorta at the root of the mesentery, opening the peritoneum, and exposing the abdominal aorta; the abdominal aorta wall is punctured and cut at the proximal end in an inclined angle of 30 degrees, when the front end of the puncture part 1 completely enters the abdominal aorta, a button is pressed, the limiting hook on the right side is lifted to remove the limiting effect on the baffle of the matching part 112, the puncture tip 111 is retracted into the accommodating channel 12 under the action of the retraction spring 131 to prevent the opposite side aorta wall from being damaged, the integrated puncture perfusion catheter is pushed towards the proximal end integrally until a specified marking line is reached, water is injected into the inflatable water bag 22 on the proximal end and the inflatable water bag 22 on the distal end in sequence, the perfusion fluid propelling device is connected, the perfusion system is constructed, then the perfusion fluid is injected into the perfusion opening 21, and the perfusion fluid flows out from the perfusion fluid outlet 23 to finish the perfusion of donor organs.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. An integrated puncture perfusion catheter for perfusion of an abdominal organ transplant donor, characterized by: one end of the integrated puncture perfusion catheter is provided with a puncture part (1), the puncture part (1) comprises a puncture piece (11), an accommodating channel (12) and a retraction component (13) capable of controlling the puncture piece (11) to retract into the accommodating channel (12), the puncture piece (11) is arranged in the accommodating channel (12) and can stretch into and out of the accommodating channel (12), and the retraction component (13) is connected with the puncture piece (11);

one end of the puncture piece (11) is provided with a puncture tip (111), the other end of the puncture piece is provided with a matching part (112) which is used for matching with the retraction component (13), and the retraction component (13) comprises a retraction spring (131) which drives the puncture piece (11) to retract into the accommodating channel (12) and an excitation part (132) which is matched with the matching part (112) to enable the puncture piece (11) to extend out of the accommodating channel (12);

the puncture tip (111) is of a shovel-shaped structure with a concave middle part, the matching part (112) is of an inclined plane shape, a connecting rod (113) is arranged between the puncture tip (111) and the matching part (112), one end of the excitation part (132) is provided with an inclined plane matched with the matching part (112), the other end of the excitation part is provided with an excitation button, and the excitation part (132) is further provided with a reset spring (133) for driving the excitation part (132) to be far away from the matching part (112);

the outer part of the puncture part (1) is in a streamline cambered surface shape, and the accommodating channel (12) is arranged in a way of inclining to the length direction of the integrated puncture perfusion catheter;

the puncture part (1) is provided with a limiting part (134) for preventing the excitation part (132) from protruding out of the outer surface of the puncture part (1).

2. The integrated piercing perfusion catheter for perfusion of an abdominal organ transplant donor according to claim 1, wherein: the excitation part (132) is in smooth transition with the streamline cambered-surface-shaped outer surface of the puncture part (1) under the limiting action of the limiting part (134).

3. The integrated puncture perfusion catheter for perfusion of abdominal organ transplant donors according to claim 1 or 2, characterized in that: the other end of the integrated puncture perfusion catheter is provided with a perfusion part (2), and the perfusion part (2) is fixedly connected with the puncture part (1) and is not communicated with the inside.

4. The integrated piercing perfusion catheter for perfusion of an abdominal organ transplant donor according to claim 3, wherein: the one end of portion of filling (2) is sealed, and the other end is equipped with perfusion opening (21) that can carry the perfusate towards the cavity inner chamber of portion of filling (2), be equipped with two on the portion of filling (2) and fill formula water pocket (22), two can fill formula water pocket (22) interval arrangements, and be equipped with perfusate export (23) on the pipe wall of the portion of filling (2) between two can fill formula water pocket (22).

5. The integrated piercing perfusion catheter for perfusion of an abdominal organ transplant donor according to claim 4, wherein: the water filling device is characterized in that a water filling channel (24) used for filling the water filling type water bag (22) with water is arranged on the filling part (2), one end of the water filling channel (24) is communicated with the water filling type water bag (22), the other end of the water filling channel is provided with a water filling opening (25), a non-return mechanism used for preventing liquid in the water filling type water bag (22) from flowing back is arranged at the water filling opening (25), and the water filling channels (24) of the two water filling type water bags (22) are mutually independent.

6. The integrated piercing perfusion catheter for perfusion of an abdominal organ transplant donor according to claim 4, wherein: be equipped with annular water pocket groove (26) on the portion of infusing (2), can fill formula water pocket (22) and locate in annular water pocket groove (26), and can fill formula water pocket (22) and do not surpass annular water pocket groove (26) when not filling water.