CN217409528U - Pre-filled catheter flusher - Google Patents

Abstract

The utility model provides a pre-filled catheter flusher, it includes: at least part deformable stock solution container 1, stock solution container 1 is provided with injection port 10, injection port 10 is sealed fixed with attach fitting 3, still include pressure device 2, attach fitting 3 is provided with pressure port 35, pressure device 2 sets up at least part in stock solution container 1 is inside, and pass the pressure port 35 compress tightly in attach fitting 3 inner chamber wall and seal injection port 10, when making the washing liquid pressure reach or be greater than the predetermined value through stock solution container 1 deformation, the washing liquid overcomes pressure device 2's resistance and realizes washing. The pre-filling catheter flusher of the utility model is more reliable and safe in sealing, simple and convenient in operation, and low in the whole manufacturing cost of the product.

Description

Pre-filled catheter flusher

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to pre-filling type catheter flusher for catheter flushing.

Background

Intravenous catheters are widely used in clinics, such as intravenous indwelling needles, PICCs, and the like. The tube sealing is one of the important links for the successful application of the vein catheterization, and the tube sealing liquid is the key for keeping the pipeline smooth. And current pre-filled formula catheter flusher exists the stock solution container and is kick-backed by the compression part, leads to the flush fluid backward flow to stock solution inner chamber, and then leads to blood to flow backward into the catheter intracavity, appears the problem of catheter blockage.

In order to solve the above problems, CN201420161938.7 discloses an anti-backflow plastic ampoule for an indwelling needle sealing/flushing tube, wherein the ampoule comprises an ampoule body and a nipple connected to the top of the ampoule body, a one-way valve for conducting the nipple in one direction is arranged at the connection between the nipple and the ampoule body, and the one-way valve prevents flushing liquid from flowing back into the ampoule body. Above-mentioned single-pass valve includes two valves, and when the flush fluid when inside from outside flow direction ampoule body, ampoule body inside can produce certain negative pressure, and two valves of single-pass valve take place deformation under negative pressure effect and liquid medicine promotion, and then lead to the flush fluid resorption to ampoule body inside, therefore the single-pass valve of above-mentioned device has the resorption phenomenon in the twinkling of an eye of closing.

Therefore, there is a need for a prefilled catheter flusher that can prevent the back suction of the flushing fluid, and is safe and reliable to use and low in manufacturing cost.

Disclosure of Invention

The utility model provides a can prevent flush fluid resorption, use safe and reliable, and the lower pre-filled formula pipe flusher of manufacturing cost.

The utility model provides a pre-filling type catheter flusher, it includes: the device comprises a deformable liquid storage container and a pressure applying device, wherein an injection port is formed in the liquid storage container, a connecting joint is fixed to the injection port in a sealing mode, the connecting joint is provided with a pressure applying port, the pressure applying device is at least partially arranged inside the liquid storage container and penetrates through the pressure applying port to be pressed on the inner cavity wall of the connecting joint to close the injection port, and when the pressure of flushing liquid reaches or is larger than a preset value due to deformation of the liquid storage container, the flushing liquid overcomes the resistance of the pressure applying device to achieve flushing.

Preferably, the pressing device comprises a pressing component and a sealing column, the pressing component and the sealing column are both arranged inside the liquid storage container, the sealing column is sealed in the pressing port and pressed against the inner cavity wall of the connecting joint by the pressing component, and one side, facing the flushing liquid, of one end, pressed against the inner cavity wall of the connecting joint, of the sealing column is provided with an inclined section.

Preferably, the pressing component is a compression spring, one end of the compression spring is pressed against the sealing column, and the other end of the compression spring is limited in the pressing port by a limiting component; or the pressing component is a spring piece/elastic membrane, one end of the spring piece/elastic membrane compresses the sealing column, and the other end of the spring piece/elastic membrane is limited in the pressing port by a limiting component; or the pressing component is a spring leaf/elastic membrane, and the spring leaf/elastic membrane is formed or hermetically fixed on the sealing column and limited in the pressing port by a limiting component.

Preferably, the pressing device comprises a pressing component and a sealing column, the pressing component is arranged outside the liquid storage container, the sealing column is arranged inside the liquid storage container, the sealing column is sealed in the pressing port and is pressed on the inner cavity wall of the connecting joint by the pressing component, and one side, facing the flushing liquid, of one end, pressed on the inner cavity wall of the connecting joint, of the sealing column is provided with an inclined section.

Preferably, the pressing component is of a pressure lever structure, one end of the pressure lever is fixed to the connecting joint, and the other end of the pressure lever is pressed on the sealing column.

Preferably, the injection device further comprises a sealing component which seals the injection port.

Preferably, the sealing component is a cap-shaped structure with one end closed and the other end open, the opening end of the sealing component is sleeved on the outer wall of the connecting joint, and the closed end of the sealing component is provided with an easy-to-break part.

Preferably, the pressing component is of a compression bar structure, one end of the compression bar is formed or fixed on the outer wall of the opening end of the sealing component, and the other end of the compression bar is pressed on the sealing column.

Preferably, the pressing component is an elastic clip, and a clamping part of the elastic clip clamps the pressing port and presses the sealing column.

Preferably, the injection device further comprises a sealing component which seals the injection port.

Advantageous effects

Firstly, the pressure applying device of the utility model is at least partially arranged inside the liquid storage container, passes through the pressure applying port and is pressed on the inner cavity wall of the connecting joint to seal the injection port, and when the pressure of the flushing liquid reaches or is more than a preset value through the deformation of the liquid storage container, the flushing liquid overcomes the resistance of the pressure applying device to realize flushing; the pressing device blocks the flushing liquid outside the injection port in the closing moment, effectively prevents the phenomenon of flushing liquid suck-back, is more reliable and safe in sealing, and is low in overall manufacturing cost of products.

Secondly, the utility model has various forms of the pressing device, the pressing part of the pressing device is arranged inside the liquid storage container, the pressing part is a compression spring, the compression spring of the pressing device presses the sealing column to the inner cavity wall of the connecting joint to seal the injection port, the pressing is firm, and the sealing is stable; or the pressing component of the pressing device is a spring leaf/elastic membrane, the spring leaf/elastic membrane of the pressing device presses the sealing column to the inner cavity wall of the connecting joint to seal the injection port, the pressing is firm, and the overall manufacturing cost of the product is low; the spring piece/elastic membrane can be integrally formed with the sealing column, so that parts are reduced, and the structure and the production process are simple. In addition, a pressing part of the pressing device can be arranged outside the liquid storage container, the pressing part is of a pressing rod structure, the sealing column is pressed on the inner cavity wall of the connecting joint by the pressing rod of the pressing device to seal the injection port, the pressing is firmer, the sealing is more stable, and the structure and the production process are simple; or the pressing part of the pressing device is an elastic clamp, the sealing column of the pressing device is pressed on the inner cavity wall of the connecting joint by the clamping part of the elastic clamp to seal the injection port, the pressing is firmer and more durable, the sealing is more stable, and the structure and the production process are simple.

Third, the utility model discloses well sealed post has the slope and cuts the section, and this slope is cut sectional being provided with and is helped the flush fluid to remove sealed post to the direction of keeping away from sealed post and the sealed contact surface of cavity wall in the attach fitting and realize washing.

Fourth, the utility model discloses the injection port seals has the part of sealing, should seal the part and prevent the flush fluid of stock solution inner chamber leaks from the injection port. In addition, one end of the pressing device can be formed or fixed on the sealing part, so that the product is easy to form, and the manufacturing cost of the product is reduced.

Drawings

FIG. 1: the full-section exploded view of the pre-filled catheter flusher of the first embodiment of the utility model (the pressure applying component is a compression spring);

FIG. 2 is a schematic diagram: the partial section view of the pre-filled catheter flusher of the first embodiment of the utility model (the pressure applying component is a compression spring);

FIG. 3: the partial section view of the pre-filled catheter flusher of the first embodiment of the utility model (the pressure applying component is a spring leaf or an elastic membrane);

FIG. 4: the second partial cross-sectional view of the pre-filled catheter flusher of the first embodiment of the present invention (the pressing member is a spring leaf or an elastic membrane);

FIG. 5: the partial section view of the pre-filled catheter flusher of the first embodiment of the utility model (the pressure applying component is formed at one end of the sealing column);

FIG. 6: the second embodiment of the present invention is a partial cross-sectional view of the pre-filled catheter flusher (the pressure applying member is a pressure bar structure);

FIG. 7: the partial section view of the pre-filled catheter flusher of the second embodiment of the utility model (the pressure applying component and the connecting joint are integrally formed);

FIG. 8: the second embodiment of the present invention is a structure diagram of a prefilled catheter flusher (the pressing member is an elastic clip).

1. A reservoir; 10. an injection port; 11. a liquid storage inner cavity; 12. a container wall; 2. a pressure applying device; 21. sealing the column; 211. inclining the section; 212. a sealing groove; 213. a positioning table; 22. a pressing member; 221. a clamping portion; 222. an annular ferrule; 223. a holding part; 224. a pin shaft support; 225. a connecting portion; 226. a pressing part; 2261. a boss; 23. a limiting component; 24. a sealing member; 25. a connecting member; 251. a pin shaft; 252. a torsion spring; 3. connecting a joint; 30. a liquid conduit; 31. a liquid inlet; 32. a liquid outlet; 33. a pipe wall; 331. a limiting table; 34. a collar; 341. an internal thread; 35. a pressure applying port; 351. a limiting groove; 4. a sealing member; 41. an open end; 42. a closed end; 43. a frangible portion.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosure, as detailed in the claims.

The utility model provides a pre-filled catheter flusher, the following introduces the utility model provides a first embodiment of pre-filled catheter flusher.

Referring to fig. 1 and 2, a prefilled catheter flusher comprises a reservoir 1 pre-filled with a flushing liquid therein, the reservoir 1 having a container wall 12, the container wall 12 being at least partially deformable, the deformable container wall 12 being made of a flexible medical grade plastic material. Preferably, the container wall 12 is made of medical PP, so as to facilitate extrusion and reduce resilience. The container wall 12 encloses and closes and forms stock solution inner chamber 11, the stock solution inner chamber 11 is filled with the flush fluid in advance, and this container wall 12 has seted up injection mouth 10, the flush fluid is washed the injection by injection mouth 10, and this injection mouth 10 is fixed with attach fitting 3 in a sealed manner. Specifically, the connecting joint 3 is inserted into one end of the injection port 10 of the liquid storage container 1, and the liquid storage container 1 and the connecting joint 3 are connected by adopting a heat seal welding process. The connecting joint 3 is made of hard medical plastic materials, the connecting joint 3 comprises a hollow liquid pipeline 30, the liquid pipeline 30 is provided with a pipeline wall 33, a liquid inlet 31 and a liquid outlet 32, the liquid inlet 31 is communicated with the liquid outlet 32 through the liquid pipeline 30, one end of the connecting joint, connected with a washed pipeline, of the liquid pipeline 30 is the liquid outlet 32, and one end extending into the liquid storage cavity 11 is the liquid inlet 31. Specifically, the flushed pipeline can be an indwelling needle, a PICC or other equipment needing flushing; the connection adapter 3 may be a luer adapter or other connection adapter, and its specific structure is designed to be specifically matched according to the flushing device connected with it. In order to facilitate the connection joint 3 to communicate with the connection joint of the pipeline to be flushed, the outer wall of the connection joint 3 extends along the axial direction thereof to the direction of the liquid outlet 32 to form a collar 34, and an internal thread 341 which is in threaded fit with the connection joint of the pipeline to be flushed is arranged in the collar 34. The pipeline wall 33 is provided with a pressure applying opening 35 in a penetrating manner, the device further comprises a pressure applying device 2, the pressure applying device 2 is at least partially arranged inside the liquid storage container 1 and penetrates through the pressure applying opening 35 to be pressed on the inner cavity wall of the connecting joint 3 to close the injection opening 10, and when the pressure of the flushing liquid reaches or exceeds a preset value due to deformation of the liquid storage container 1, the flushing liquid overcomes the resistance of the pressure applying device 2 to realize flushing. The deformation of the liquid storage container 1 means that a certain external force is applied to the liquid storage container 1 to deform the liquid storage container, and specifically, the liquid storage container 1 can be deformed by means of extrusion, pressing and the like. The specific setting criteria of the predetermined value are as follows: the predetermined value is greater than the human venous pressure and cannot be set too great to increase the difficulty of flush injections. The preferred ranges for the predetermined values are: 1.5kPa-1MPa, and the specific value of the preset value is designed according to the parameters of material selection, structure and the like of the liquid storage container 1 and the pressing device 2, and is not limited specifically.

With continued reference to fig. 1 and fig. 2, the pressing device 2 includes a sealing post 21 and a pressing member 22, the sealing post 21 is cylindrical, the sealing post 21 is made of polyisoprene, the sealing post 21 is disposed inside the liquid storage container 1, and the sealing post 21 is hermetically connected to the pressing port 35, so as to effectively prevent the flushing liquid from leaking from a gap between the sealing post 21 and the pressing port 35. Specifically, a sealing part 24 is arranged between the outer wall of the sealing column 21 and the inner wall of the pressure applying opening 35, the sealing part 24 is preferably an O-ring, the sealing part 24 is made of polyisoprene or butyl rubber, and the sealing part 24 is sleeved on the outer wall of the sealing column 21. In order to facilitate the installation and fixation of the sealing component 24, the outer wall of the sealing column 21 is provided with an annular sealing groove 212, and the sealing component 24 is clamped in the sealing groove 212 to effectively prevent the sealing component 24 from moving and falling off. The pressing component 22 is arranged inside the liquid storage container 1, the pressing component 22 is a compression spring, one end of the compression spring is pressed on one end of the sealing column 21, which is far away from the inner cavity wall of the connecting joint 3, and the other end of the compression spring is limited in the pressing port 35 by the limiting component 23. The limiting part 23 is a limiting ring made of medical plastic, the compression spring is limited in the pressure applying opening 35 by the limiting ring, the compression spring is prevented from being separated from the pressure applying opening 35, the compression spring is favorably compressed on the sealing column 21, and the sealing column 21 and the inner cavity wall of the connecting joint are more firmly compressed and more stably sealed. The one end that the mouth 35 keeps away from the inner chamber wall of attach fitting 3 of exerting pressure is provided with annular spacing groove 351, and the spacing ring is fixed in spacing groove 351 is connected through fixed modes such as buckle connection, interference fit or bonding between spacing ring and the spacing groove 351. In order to facilitate the installation and positioning of the compression spring, a positioning table 213 is arranged on the outer wall of one end, away from the inner cavity wall of the connecting joint 3, of the sealing column 21, the outer wall of the sealing column 21 is sleeved with the compression spring and is abutted against the positioning table 213, and the positioning table 213 is used for limiting the depth of the outer wall of the sealing column 21 sleeved with the compression spring. Further, the outer diameter of the sealing column 21 close to one end of the limiting ring is smaller than the inner diameter of the limiting ring, the outer diameter of the compression spring is larger than the inner diameter of the limiting ring, the arrangement does not affect the limiting ring to limit the compression spring in the pressure applying port 35, and a space for the sealing column 21 to move towards the limiting ring is reserved. With reference to fig. 2, when the tube needs to be flushed, the pressure of the flushing liquid inside the liquid storage container 1 is increased by pressing the liquid storage container 1 until the pressure of the flushing liquid reaches or exceeds a predetermined value, the sealing column 21 has an inclined cut-off surface 211, the inclined cut-off surface 211 receives an upward component force of the flushing liquid perpendicular to the inclined cut-off surface 211, and the flushing liquid pushes the sealing column 21 to move towards the direction of the stop ring, so that the compression spring is compressed, and flushing is achieved. When need not dashing the seal pipe, stop the extrusion to stock solution container 1, make the inside flush fluid pressure of stock solution container 1 reduce, when being less than the predetermined value until flush fluid pressure, sealing post 21 is pressed tightly in connector 3 inner chamber wall by pressure applying part 22 fast, block the flush fluid outside injection port 10 in the twinkling of an eye compressing tightly closed, and sealing post 21 can not receive the flush fluid to promote to take place to warp, effectively avoid the inside negative pressure that forms of stock solution container 1, and then effectively prevent the flush fluid resorption phenomenon to take place, seal more reliably safety. The end of the inclined section 211 close to the pressure applying opening 35 is inclined obliquely downward, so that the inclined section 211 receives an upward component force of the flushing fluid perpendicular to the inclined section 211, thereby pushing the sealing column to move 21 toward the retainer ring. In this embodiment, the pressure applying device 2 may also be selected from other mechanical structures as long as the pressure applying device 2 is ensured to penetrate through the pressure applying port 35 and press against the inner cavity wall of the connecting joint 3, thereby closing the injection port 10.

With continued reference to fig. 1 and 2, in order to prevent the leakage of the flushing liquid before use, the device further comprises a sealing component 4, wherein the sealing component 4 is sealed at the injection port 10, the sealing component 4 is in a cap-shaped structure, one end of the sealing component 4 is provided with a closed end 42, the other end of the sealing component 4 is provided with an open end 41, the closed end 42 of the sealing component 4 is provided with an easy-to-break part 43, and the open end 41 is welded on the outer wall of the connecting joint 3 by adopting a heat sealing process. Preferably, the wall thickness of the opening closure member 4 is locally thinned to form the frangible portion 43, which facilitates breaking the opening closure member 4. When the device is used, the closed end 42 of the sealing component 4 is firstly held by hands, the closed end 42 of the sealing component 4 is pulled to be broken along the easy-to-break part 43, the open end 41 of the sealing component 4 is continuously reserved on the outer wall of the connecting joint 3, the liquid outlet 32 is communicated with the outside, then the liquid storage container 1 is squeezed by hands to be extruded and deformed, the pressure of flushing liquid in the liquid storage cavity 11 is gradually increased at the moment, and the flushing liquid overcomes the resistance of the pressure applying device 2 to realize flushing when the pressure of the flushing liquid reaches or is greater than a preset value. With continued reference to fig. 1 and 2, the outer wall of the connection joint 3 protrudes outward to form an annular limiting platform 331, and the limiting platform 331 limits the depth of the sealing component 4 connected to the outer wall of the connection joint 3, so that positioning and assembling are facilitated.

As shown in fig. 3, optionally, pressing part 22 is spring leaf elastic membrane, and whole is cyclic annular, the spring leaf adopts stainless steel material to make or other elastic sheet metal that has makes, elastic membrane adopts silica gel, and TPE or other elastic membrane material that have make, spring leaf elastic membrane joint keeps away from the outer wall of attach fitting 3 inner chamber wall one end in sealed post 21, and spring leaf elastic membrane one end compresses tightly sealed post 21 keeps away from the one end of attach fitting 3 inner chamber wall, and the other end is spacing by stop part 23 in pressing the mouth 35, compress tightly firmly, and the whole manufacturing cost of product.

As shown in fig. 4, optionally, the pressing component 22 is a spring leaf/elastic membrane, which is in a shape of a circular disk as a whole, one end of the spring leaf/elastic membrane is pressed against the sealing column 21, and the other end of the spring leaf/elastic membrane is limited in the pressing port 35 by the limiting component 23, so that the pressing is firm, and the overall manufacturing cost of the product is low.

As shown in fig. 5, the pressing member 22 is a spring plate/elastic membrane, which is formed at one end of the sealing column 21 near the pressing opening 35, and is integrally formed with the sealing column 21, and the spring plate/elastic membrane is limited in the pressing opening 35 by a limiting member 23. Through the design of pressing part 22 and sealing post 21 integrated into one piece, reduce this application pre-filled catheter flusher spare part quantity, its structure and production technology are simpler.

Referring to fig. 6 and 7, the second embodiment of the pre-filled catheter flusher provided by the present invention has substantially the same structure as the first embodiment, and the difference between the two embodiments is that:

in order to facilitate the assembly and the compression of the product to be more firm, as shown in fig. 6, the sealing column 21 is arranged inside the liquid storage container 1, the sealing column 21 is made of butyl rubber, the pressure applying component 22 is arranged outside the liquid storage container 1, the pressure applying component 22 is of a pressure lever structure, the pressure lever is made of medical plastic material, the pressure lever is provided with a connecting portion 225 connected to the connecting joint 3 and a pressure applying portion 226 compressed on the sealing column 21, the pressure applying portion 226 is integrally close to one end of the pressure applying port 35 for compression, the assembly process is simple, and the connection is convenient and fast. Further, the inner side wall of the pressing portion 226 is provided with a circular boss 2261 protruding outwards, the outer diameter of the boss 2261 is smaller than the inner diameter of the pressing port 35, the boss 2261 is embedded into the pressing port 35 and presses the sealing column 21 through the container wall 12, and the boss 2261 further facilitates the preparation of the pressing portion 226 for being positioned at the pressing port 35 and firmly and stably pressing the sealing column 21. In order to facilitate the fixing of the pressing member 22 on the outer wall of the connecting joint 3, the outer wall of the connecting portion 225 extends outward to form an annular collar 222, and the annular collar 222 is clamped on the outer wall of the connecting joint 3. As shown in fig. 7, in order to facilitate the molding of the product, the pressing rod is integrally molded with the opening end 41 of the sealing member 4, and the pressing member 22 is formed by extending the outer wall of the opening end 41 of the sealing member 4 along the axial direction thereof toward the pressing portion 226.

As shown in fig. 8, optionally, the pressing member 22 is an elastic clip formed by two separate bodies, the elastic clip includes two symmetrically disposed clamping members, one end of each of the two clamping members is a clamping portion 221, the other end of each of the two clamping members is a holding portion 223, the two clamping members are elastically hinged to each other, specifically, a connecting member 25 is connected between the two clamping members, the connecting member 25 includes a pin shaft 251 and a torsion spring 252, inner side walls of the two clamping members extend outwards to form a pin shaft support 224, the pin shaft 251 is hinged to the torsion spring 252, and the torsion spring 252 is compressed between the two clamping members, so that one end of the clamping portion 221 is in an elastically closed state. In this embodiment, the elastic hinge is formed between the two clamping members because the pin 251 is hinged with the torsion spring 252. When the clamping device is used, the holding part 232 is pressed inwards by hands, so that the clamping part 221 is elastically opened and clamped in the pressure applying opening 35, the clamping is firm, the sealing performance is good, and the operation is convenient.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modifications, equivalents, improvements and the like which are made without departing from the spirit and scope of the present invention should be considered within the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (10)

1. A prefilled catheter flusher, comprising: the flushing device is characterized by further comprising a pressure applying device (2), wherein the pressure applying device (2) is at least partially arranged inside the liquid storage container (1) and penetrates through the pressure applying port (35) to be pressed on the inner cavity wall of the connecting joint (3) to close the injection port (10), and when the flushing liquid pressure reaches or is larger than a preset value due to deformation of the liquid storage container (1), the flushing liquid overcomes the resistance of the pressure applying device (2) to realize flushing.

2. The prefilled catheter flusher according to claim 1, wherein the pressing device (2) comprises a pressing member (22) and a sealing column (21), the pressing member (22) and the sealing column (21) are both disposed inside the liquid storage container (1), the sealing column (21) is sealed inside the pressing port (35) and pressed against the inner cavity wall of the connector (3) by the pressing member (22), and one end of the sealing column (21) pressed against the inner cavity wall of the connector (3) has an inclined truncated surface (211) facing the flushing liquid.

3. The prefilled catheter flusher according to claim 2, wherein said pressing member (22) is a compression spring, one end of which is pressed against said sealing post (21), and the other end of which is retained in said pressing port (35) by a retaining member (23); or the pressing component (22) is a spring piece/elastic membrane, one end of the spring piece/elastic membrane presses the sealing column (21), and the other end of the spring piece/elastic membrane is limited in the pressing opening (35) by a limiting component (23); or the pressing component (22) is a spring piece/elastic membrane which is formed or hermetically fixed on the sealing column (21) and is limited in the pressing opening (35) by a limiting component (23).

4. A prefilled catheter flusher according to claim 1, wherein said pressurizing device (2) comprises a pressurizing member (22) and a sealing post (21), said pressurizing member (22) is disposed outside said liquid storage container (1), said sealing post (21) is disposed inside said liquid storage container (1), said sealing post (21) is sealed in said pressurizing port (35) and is pressed against the inner cavity wall of said connector (3) by said pressurizing member (22), and the side of one end of said sealing post (21) pressed against the inner cavity wall of said connector (3) and facing the flushing liquid has an inclined cut-off surface (211).

5. A pre-filled catheter flusher according to claim 4, wherein the pressure applying member (22) is in the form of a pressure rod, one end of which is fixed to the connecting joint (3) and the other end of which is pressed against the sealing post (21).

6. A pre-filled catheter flusher according to claim 4, further comprising a closure member (4), the closure member (4) being closed to the injection port (10).

7. A pre-filled catheter flusher according to claim 6, wherein the sealing member (4) is of a cap-like structure with one end closed and the other end open, the open end (41) of the sealing member (4) is sleeved on the outer wall of the connecting joint (3), and the closed end (42) of the sealing member (4) is provided with a frangible portion (43).

8. The prefilled catheter flusher according to claim 7, wherein said pressing member (22) is in the form of a pressing rod, one end of said pressing rod is formed or fixed on the outer wall of the opening end (41) of the sealing member (4), and the other end is pressed against said sealing post (21).

9. The prefilled catheter flusher of claim 4, wherein said pressure applying member (22) is a resilient clip, a clamping portion (221) of which is clamped to said pressure applying port (35) and pressed against said sealing post (21).

10. A pre-filled catheter flusher according to any one of claims 1 to 3, further comprising a closure member (4), wherein the closure member (4) seals the injection port (10).

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