CN216182331U - Catheter tip forming die - Google Patents

Abstract

The utility model relates to the technical field of forming dies, in particular to a catheter tip forming die which comprises an upper die, a die core and a lower die which are sequentially stacked from top to bottom, wherein the die core is provided with a forming cavity, the die core is provided with a feed opening communicated with the forming cavity right above the forming cavity, the die core is provided with an accommodating cavity communicated with the forming cavity right below the forming cavity, the forming cavity and the accommodating cavity are both narrow at the top and wide at the bottom, and the minimum inner diameter of the accommodating cavity is equal to the maximum inner diameter of the forming cavity which is equal to the outer diameter of a catheter. Pressure is formed after the forming die closes the mould, in injecting the pipe with the sizing material of feed opening and the shaping intracavity, according to the shape shaping of mould shaping chamber to with pipe tip cross-linking, sharp-pointed and soft slick and sly of pipe tip smooth transition, sharp-pointed after the shaping, difficult fracture is difficult for damaging the vascular wall, does not scrape the hand, does not have and drapes over one's shoulders and arch, can not "hang blood" in the use, does not form the thrombus.

Description

Catheter tip forming die

Technical Field

The utility model relates to the technical field of forming dies, in particular to a catheter tip forming die.

Background

A Peripherally Inserted Central Catheter (PICC) is a medical device used to establish long and medium term intravenous therapy or intravenous infusion of hypertonic, irritating drugs for patients. The existing peripherally inserted central venous catheter needs to be subjected to tip molding, generally, glue injection is directly carried out in a mold, the catheter is taken down from the mold after the shape of the tip is formed, and finally the tip and the catheter are bonded by glue, so that the end part of the catheter is in a sealed state; the blade is then used to make a cut near the end of the catheter. Adopt current forming die to come the shaping most advanced, most advanced and pipe tip linkage effect is relatively poor, and glue overflows easily, and then appears protruding and drape over one's shoulders cutting edge of a knife or a sword (overlap, burr, excessive limit promptly), and the junction is level and smooth inadequately, leads to leading to in the use can causing the damage to the blood vessel inner wall.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a catheter tip forming die, and aims to solve the technical problems that in the prior art, after a tip and a catheter are formed, the bonding effect is poor, bulges and burrs are easy to occur, and the connection part is not smooth enough, so that the inner wall of a blood vessel is damaged in the using process.

In order to achieve the purpose, the utility model provides a catheter tip forming die, which comprises an upper die, a die core and a lower die which are sequentially stacked from top to bottom, wherein the die core is provided with a forming cavity, the die core is provided with a feed opening communicated with the forming cavity right above the forming cavity, the die core is provided with an accommodating cavity communicated with the forming cavity right below the forming cavity, the forming cavity and the accommodating cavity are both narrow at the top and wide at the bottom, and the minimum inner diameter of the accommodating cavity is equal to the maximum inner diameter of the forming cavity which is equal to the outer diameter of a catheter. Most advanced and pipe tip integrated into one piece, therefore most advanced after the shaping and pipe tip smooth transition, the soft rounding off of most advanced, difficult fracture, difficult damage vascular wall do not scrape the hand, do not have and drape over one's shoulders cutting edge of a knife or a sword and arch, can not "hang blood" in the use, do not form the thrombus.

Preferably, the feed opening is in an inverted cone shape with a wide upper part and a narrow lower part. The shape of the feed opening can facilitate the accurate injection of the sizing material into the forming cavity and the inner cavity of the end part of the conduit in the accommodating cavity,

preferably, the central point of the communicating part of the feed opening and the forming cavity is collinear with the central point of the forming cavity in the vertical direction. The rubber material extruded from the feed opening can be more accurately injected into the inner cavity of the catheter, and the molding cavity can be quickly and uniformly filled.

Preferably, the lower end face of the mold core is provided with a placing cavity communicated with the accommodating cavity, and the axis of the accommodating cavity is perpendicular to the axis of the placing cavity. The accommodating cavity and the placing cavity are arranged in such a way that the forming die is suitable for catheters with various lengths, and the catheters are also conveniently placed in the die core.

Preferably, the lower die is provided with a gasket right below the accommodating cavity. In the pressurizing and pressure maintaining process, the gasket can prop against the core needle and the guide pipe, so that the guide pipe is prevented from retreating (withdrawing the pipe), the bent part of the guide pipe is protected from being abraded by the inner walls of the mold core and the lower mold (made of stainless steel), and the buffering effect is achieved.

Preferably, a placing groove for placing the gasket is formed in the upper end surface of the lower die. The gasket can be conveniently positioned, installed and replaced by arranging the placing groove, and the gasket can be prevented from loosening, deviating and falling off by limiting the gasket through the placing groove.

Preferably, the upper die is provided with a first guide hole penetrating from top to bottom, the die core is provided with a second guide hole penetrating from top to bottom, and the first guide hole and the second guide hole are communicated with each other; the lower die is provided with a guide post which can be slidably inserted into the first guide hole and the second guide hole. The first guide hole, the second guide hole and the guide column are matched to play a role in limiting and positioning.

Preferably, both sides of the upper die are provided with first handles. The upper die is convenient for workers to open/close, and the upper die is more convenient and stable to open/close.

Preferably, both sides of the mold core are provided with second handles. The mold core is convenient for workers to open/close, and the mold core is more convenient and stable to open/close.

Preferably, the two first handles and the two second handles are vertically offset from each other. The first handle and the second handle are staggered, so that the first handle and the second handle can be prevented from being clamped to a worker, and the operation of the worker is facilitated.

The catheter tip forming die at least has the following beneficial effects: pressure is formed after the forming die compound die, in injecting the pipe with the sizing material of feed opening and the shaping intracavity, according to the shape shaping of mould shaping chamber to with pipe tip cross-linking, pointed end and pipe tip integrated into one piece, therefore sharp-pointed and soft slick and sly of pipe tip smooth transition after the shaping, difficult fracture, difficult damage vascular wall, do not scrape the hand, do not have and drape over a knife or a sword and arch, can not "hang blood" in the use, do not form the thrombus. The funnel with the accommodating cavity shaped like an inverted buckle is provided, the tail end of the funnel is slender and gradually narrowed until the size of the funnel is consistent with the outer diameter of the catheter, the catheter can be clamped, the end part of the catheter is not plugged into the forming cavity, therefore, the molten rubber forms a tip in the forming cavity, and the end part of the catheter forms a closed state, namely tip forming.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of a forming mold according to the present invention;

FIG. 2 is a schematic top view of the forming mold of the present invention;

FIG. 3 is a schematic cross-sectional view of a forming mold according to the present invention;

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

FIG. 5 is an enlarged partial view of portion B of FIG. 4;

FIG. 6 is a schematic sectional view of an exploded structure of a forming mold according to the present invention;

FIG. 7 is a schematic view of a partial cross-sectional configuration of a conduit of the present invention positioned within a die;

fig. 8 is a schematic cross-sectional view of the lower die of the present invention.

In the drawings: 1-upper die, 11-first guide hole, 12-first handle, 2-die core, 21-forming cavity, 22-feed opening, 23-containing cavity, 24-placing cavity, 25-second guide hole, 26-second handle, 3-lower die, 31-placing groove, 32-guide column, 4-gasket, 5-conduit and 6-core needle.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 8, the tip forming mold for catheter comprises an upper mold 1, a mold core 2 and a lower mold 3 which are sequentially stacked from top to bottom, wherein a forming cavity 21 is formed in the mold core 2, a feed opening 22 communicated with the forming cavity 21 is formed right above the forming cavity 21 in the mold core 2, a containing cavity 23 communicated with the forming cavity 21 is formed right below the forming cavity 21 in the mold core 2, the forming cavity 21 and the containing cavity 23 are both narrow at the top and wide at the bottom, and the minimum inner diameter of the containing cavity 23 is equal to the maximum inner diameter of the forming cavity 21 which is equal to the outer diameter of the catheter 5.

The forming die provided by the scheme is mainly used in the forming process of the tip end of the silica gel catheter, and the forming process of the tip end of the silica gel catheter mainly comprises the following steps: the method comprises the following steps: step 1: inserting the core needle 6 into the catheter 5 from the end opening of the catheter 5; step 2: placing the end part of the conduit 5 inserted with the core needle 6 in the accommodating cavity 23 of the forming die; and step 3: adding rubber material into the feed opening 22 above the molding cavity 21, closing the molding mold, heating the molding mold to inject the rubber material in the feed opening 22 into the end part of the guide pipe 5 and form a tip of the rubber material in the molding cavity 21; and 4, step 4: pressure maintaining and shaping; and 5: opening the mold, and taking out the conduit 5; step 6: an incision is made in the catheter 5 and the core needle 6 is removed from the incision. The catheter 5 is specifically made of silicon rubber which is nontoxic, tasteless, odorless, good in biocompatibility with human tissues, anticoagulant effect and very little in reactivity with the human tissues, and is very suitable for being used as a medical material. The catheter 5 is a hollow long straight tube, the maximum length of the catheter body reaches 80cm, the minimum outer diameter of the catheter body is only 1.1mm, and the catheter body is soft and slender. After the catheter 5 is extruded, two ends of the catheter are in an open state, if the effect of the three-way valve is to be achieved, a tip is required to be formed at least at one end of the catheter, the end is changed into a closed state, a notch is additionally formed, the shape of the tip is generally not specifically required, the tip mainly serves to close the end of the catheter 5, and the specific shape can be set according to the use requirement. The core pin 6 is made of stainless steel or other suitable metal materials. The tip forming die of the catheter 5 is used for forming a tip at the end part of the catheter 5 and comprises an upper die 1, a die core 2 and a lower die 3 which are sequentially stacked from top to bottom; a feed opening 22 extending downwards is formed in the upper end face of the mold core 2, and the feed opening 22 is communicated with a molding cavity 21 right below the feed opening; the feed opening 22 is similar to an inverted cone shape, and is wide at the upper part and narrow at the lower part; the forming cavity 21 is used for forming a tip, and the shape of the forming cavity is the same as that of the tip to be formed, specifically, the forming cavity is in a semi-sphere shape, and the top of the forming cavity is narrow and the bottom of the forming cavity is wide; the forming cavity 21 is communicated with an accommodating cavity 23 right below the forming cavity, the accommodating cavity 23 is used for accommodating the end part of the guide pipe 5, the accommodating cavity 23 is in a funnel shape with a narrow upper part and a wide lower part, and the inner diameter of the uppermost end of the accommodating cavity 23 (namely the minimum inner diameter of the accommodating cavity 23) is the same as the inner diameter of the lowermost end of the forming cavity 21 (namely the maximum inner diameter of the forming cavity 21); the minimum inner diameter of the receiving cavity 23 is equal to the maximum inner diameter of the forming cavity 21, which is equal to the outer diameter of the catheter 5. The mold core 2 is provided with a plurality of molding cavities 21, a plurality of accommodating cavities 23 and a plurality of feed openings 22, and the molding cavities 21, the accommodating cavities 23 and the feed openings 22 are in one-to-one correspondence, so that tips of a plurality of guide pipes 5 can be molded simultaneously. The silicone rubber collagen (solid) is placed in the feed opening 22, downward pressure is generated in the mold closing process, and the silicone rubber collagen is injected (pressed) into the inner cavities of the end parts of the guide pipes 5 in the molding cavity 21 and the accommodating cavity 23; since part of the glue will flow inside the tube 5 and part of the glue will be outside the tube 5, the formed tip will be shaped like a mushroom. After the reserved inner cavity of the catheter 5 is filled with the sizing material, the reserved space distance of the molding cavity 21 is continuously filled; pressure is formed after the die is closed, the rubber material of the feed opening 22 is injected into the catheter 5 and the molding cavity 21, the rubber material is molded according to the shape of the molding cavity 21 of the die and is crosslinked with the end part of the catheter 5, and the tip and the end part of the catheter 5 are integrally molded, so that the molded tip and the end part of the catheter 5 are in smooth transition, soft and smooth, difficult to break, difficult to damage the vessel wall, free of hand scraping, free of burrs and bulges, free of blood hanging in the use process and free of thrombus formation. The receiving chamber 23 is shaped like an inverted funnel, with the end being elongated and tapered to conform to the outer diameter of the catheter 5, and is capable of gripping the catheter 5 so that the end of the catheter 5 does not slip into the molding chamber 21, so that the molten compound forms a tip in the molding chamber 21 and the end of the catheter 5 is closed, i.e., "tip-molded". As the conduit 5 is soft and is a hollow tube, the core needle 6 inserted in the conduit 5 can be used for supporting the conduit 5, and limiting the rubber material from flowing into the inner cavity of the conduit 5 too deeply, thereby playing the role of limiting and supporting.

Further, the feed opening 22 is in an inverted conical shape with a wide top and a narrow bottom. The feed opening 22 is similar to an inverted cone, the upper part of the feed opening is wide, and the lower part of the feed opening is narrow, so that the aperture of the communication part of the feed opening 22 and the forming cavity 21 is the smallest; due to the smaller inner diameter of the conduit 5, the shape of the feed opening 22 facilitates accurate injection of the glue into the forming chamber 21 and into the inner chamber at the end of the conduit 5 in the receiving chamber 23 (i.e. into the conduit 5 from the opening at the end of the conduit 5)

Further, the central point of the communicating portion of the feed opening 22 and the forming cavity 21 is vertically collinear with the central point of the forming cavity 21. The communicating part of the feed opening 22 and the molding cavity 21 is a small hole, and the center of the small hole is positioned on the central axis of the molding cavity 21, so that the sizing material extruded from the feed opening 22 can be more accurately injected into the inner cavity of the conduit 5, and the molding cavity 21 can be quickly and uniformly filled.

Further, a placing cavity 24 communicated with the accommodating cavity 23 is formed in the lower end face of the mold core 2, and the axis of the accommodating cavity 23 is perpendicular to the axis of the placing cavity 24. The placing cavity 24 and the accommodating cavity 23 are used for placing/accommodating the catheter 5, but the accommodating cavity 23 accommodates the part of the catheter 5 inserted with the core needle 6, and the placing cavity 24 accommodates the other part of the catheter 5 inserted with the core needle 6; the containing cavity 23 and the placing cavity 24 are perpendicular to each other, so that the conduit 5 is in an L-shaped state in the mold core 2, and the portion of the conduit 5 in which the core pin 6 is inserted is in a vertical state. As mentioned above, the length of the conduit 5 can reach 80cm at the longest, so the accommodating cavity 23 and the placing cavity 24 in the mold core 2 are arranged in such a way that the forming mold can be suitable for conduits 5 with various lengths, and the conduits 5 can be conveniently placed in the mold core 2; on the other hand, the core needle 6 is inserted into the conduit 5, and the conduit 5 of the part is positioned in the vertical accommodating cavity 23, so that the core needle 6 can better support the conduit 5, the rubber material is limited from flowing into the inner cavity of the conduit 5 too deeply, the conduit 5 is also limited from retreating, and the limiting and supporting effects are achieved.

Further, the lower die 3 is provided with a gasket 4 right below the accommodating cavity 23. As previously described, when the catheter 5 is placed in the housing chamber 23, the portion of the catheter 5 in which the core needle 6 is inserted is in a vertical state; the gasket 4 is arranged right below the accommodating cavity 23, namely the gasket 4 is arranged right below the core pin 6 and plays a certain supporting role for the core pin 6 and the guide pipe 5. After the die is closed, in the processes of pressurization and pressure maintaining, the gasket 4 can prop against the core needle 6 and the guide pipe 5, so that the guide pipe 5 is prevented from retreating (i.e. withdrawing), the bent part of the guide pipe 5 is protected from being abraded by the inner walls of the die core 2 and the lower die 3 (made of stainless steel), and a buffering effect is achieved; the gasket 4 may be made of silica gel or other soft pad.

Further, a placing groove 31 for placing the gasket 4 is formed in the upper end surface of the lower die 3. The gasket 4 is specifically arranged on the lower die 3, a placing groove 31 is formed in the upper end face of the lower die 3, and the position of the placing groove 31 corresponds to the accommodating cavity 23, that is, the placing groove 31 is located right below the accommodating cavity 23. The gasket 4 can be conveniently positioned, installed and replaced by arranging the placing groove 31, and the gasket 4 is limited by the placing groove 31 so that the gasket 4 can be prevented from loosening, deviating and falling off.

Furthermore, the upper die 1 is provided with a first guide hole 11 penetrating from top to bottom, the die core 2 is provided with a second guide hole 25 penetrating from top to bottom, and the first guide hole 11 and the second guide hole 25 are communicated with each other; the lower mold 3 is provided with guide posts 32, and the guide posts 32 are slidably inserted into the first guide holes 11 and the second guide holes 25. The first guide hole 11 and the second guide hole 25 have the same aperture and are communicated with each other; the aperture of each of the first guide hole 11 and the second guide hole 25 is slightly larger than the diameter of the guide post 32, and when the mold core is placed on the lower mold and the upper mold 1 compresses the mold core 2, the guide posts 32 are inserted into the first guide hole 11 and the second guide hole 25. In the mold closing process of the forming mold, the guide columns 32 are matched with the first guide holes 11 and the second guide holes 25, so that the upper mold 1, the mold core 2 and the lower mold 3 are prevented from deviating in work, and the forming cavity 21, the accommodating cavity 23 and the feed opening 22 are ensured to be in the same vertical direction; the guide post 32 and the first guide hole 11 and the second guide hole 25 are matched to play a role in limiting and positioning. Preferably, the lower die 3 is provided with at least two guide posts 32, the upper die 1 is provided with at least two first guide holes 11, the die core 2 is provided with at least two second guide holes 25, and the number of the first guide holes 11 and the number of the second guide holes 25 are the same as the number of the guide posts 32; when the number of the guide posts 32, the first guide holes 11 and the second guide holes 25 is 2, the two guide posts 32 can be respectively arranged at the opposite corners of the lower die 3, and the positions of the first guide holes 11 and the second guide holes 25 are kept corresponding to the guide posts 32; of course, the number of the guide posts 32 may also be three, four or other numbers, and the number of the first guide holes 11 and the second guide holes 25 may also be matched with the number.

Further, both sides of the upper die 1 are provided with a first handle 12. Set up first handle 12 on last mould 1, can make things convenient for the staff to open/close and go up mould 1, and all be equipped with first handle 12 in the both sides of last mould 1, open/close and go up mould 1 more convenient, steady.

Further, the two sides of the mold core 2 are both provided with second handles 26. The structure of the second handle 26 is consistent with that of the first handle 12, similarly, the second handle 26 is arranged on the mold core 2, so that the mold core 2 can be conveniently opened/closed by a worker, the first handles 12 are arranged on two sides of the mold core 2, and the mold core 2 can be more conveniently and stably opened/closed.

Further, the two first handles 12 and the two second handles 26 are vertically offset from each other. The upper die 1 and the die core 2 are both in a cubic structure, so that the two first handles 12 are located on two opposite sides of the upper die 1, the two second handles 26 are located on two opposite sides of the die core 2, and the two first handles 12 and the two second handles 26 are staggered and do not coincide with each other in a top view. The thickness of the upper die 1 and the die core 2 is small, if the first handle 12 and the second handle 26 are overlapped in the vertical direction, when a worker closes the upper die 1, the hand is easily clamped by the first handle 12 and the second handle 26, and when the upper die 1 is opened, the first handle 12 is not conveniently grabbed. Therefore, by staggering the first handle 12 and the second handle 26, the first handle 12 and the second handle 26 are prevented from being clamped to a worker, and the worker can operate the tool conveniently.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. Catheter point end forming die, its characterized in that: including last mould (1), mold core (2) and lower mould (3) that top-down stacked gradually the setting, molding cavity (21) have been seted up in mold core (2), mold core (2) be in molding cavity (21) seted up directly over with feed opening (22) that molding cavity (21) are linked together, mold core (2) be in molding cavity (21) seted up directly below with what molding cavity (21) were linked together holds chamber (23), molding cavity (21) with hold chamber (23) and be under the narrow width, just the minimum internal diameter that holds chamber (23) equals the external diameter that the maximum internal diameter that becomes molding cavity (21) equals pipe (5).

2. The catheter tip forming die of claim 1, wherein: the feed opening (22) is in an inverted cone shape with a wide upper part and a narrow lower part.

3. The catheter tip forming die of claim 2, wherein: the central point of the communicating part of the feed opening (22) and the forming cavity (21) is collinear with the central point of the forming cavity (21) in the vertical direction.

4. The catheter tip forming die of claim 1, wherein: the lower end face of the mold core (2) is provided with a placing cavity (24) communicated with the containing cavity (23), and the axis of the containing cavity (23) is perpendicular to the axis of the placing cavity (24).

5. The catheter tip forming die of claim 4, wherein: and the lower die (3) is provided with a gasket (4) under the accommodating cavity (23).

6. The catheter tip forming die of claim 5, wherein: and a placing groove (31) for placing the gasket (4) is formed in the upper end surface of the lower die (3).

7. The catheter tip forming die of claim 1, wherein: the upper die (1) is provided with a first guide hole (11) penetrating from top to bottom, the die core (2) is provided with a second guide hole (25) penetrating from top to bottom, and the first guide hole (11) and the second guide hole (25) are communicated with each other; the lower die (3) is provided with a guide post (32), and the guide post (32) can be slidably inserted into the first guide hole (11) and the second guide hole (25).

8. The catheter tip forming die of claim 1, wherein: and the two sides of the upper die (1) are provided with first handles (12).

9. The catheter tip forming die of claim 8, wherein: and second handles (26) are arranged on two sides of the mold core (2).

10. The catheter tip forming die of claim 9, wherein: the two first handles (12) and the two second handles (26) are vertically staggered.

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