CN111300705A - Medical catheter and forming process thereof - Google Patents
Medical catheter and forming process thereof Download PDFInfo
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- CN111300705A CN111300705A CN201811574345.2A CN201811574345A CN111300705A CN 111300705 A CN111300705 A CN 111300705A CN 201811574345 A CN201811574345 A CN 201811574345A CN 111300705 A CN111300705 A CN 111300705A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
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Abstract
The invention discloses a medical catheter and a forming process thereof, wherein the forming process of the medical catheter is to inject a material liquid for manufacturing the medical catheter into a tubular inner cavity of a forming die, rotate the forming die filled with the material liquid so as to uniformly distribute the material liquid on the inner wall of the forming die, and plasticize the material liquid in the forming die under the condition that the forming die keeps rotating, so as to form the medical catheter. The medical catheter with consistent tube wall thickness can be formed in one step by the forming process, in the forming process, the material liquid in the forming die can be uniformly distributed on the inner wall of the forming die by rotating the forming die, rapid demoulding can be realized after plasticizing forming, the tube wall thickness of the formed medical catheter is consistent, and the forming efficiency and the quality of the formed medical catheter are improved.
Description
Technical Field
The invention relates to the field of medical tube manufacturing, in particular to a medical catheter and a forming process thereof.
Background
The existing medical catheter is generally manufactured by adopting a dip molding process, wherein the dip molding process is that a tube core is used for dipping feed liquid for manufacturing the medical catheter, in the manufacturing process, the feed liquid attached to the outer surface of the tube core flows downwards under the action of gravity, and the wall of the finally formed medical catheter has the problem of uneven thickness, so that the wall thickness of part of the medical catheter does not reach the preset thickness; moreover, because the thickness of single plastic dipping is limited, secondary or multiple plastic dipping is often required to achieve the wall thickness of the catheter, the molding efficiency is greatly reduced, and the quality problems of layering and more impurities are easily caused in the molded medical catheter; if the conduit to be molded is long and thin, the molded conduit will be adhered to the tube core and will have excessive friction with the tube core, and thus the conduit will not be released from the tube core.
Disclosure of Invention
The embodiment of the invention provides a medical catheter and a forming process thereof, which aim to solve the problems of poor product quality, low forming efficiency and difficult demoulding caused by repeated dipping of plastic in the conventional forming process of the medical catheter.
In order to solve the technical problem, the invention provides a forming process of a medical catheter, which comprises the following steps: providing a forming die, wherein the forming die is provided with a tubular inner cavity; injecting the material liquid into the tubular inner cavity of the forming die; rotating the forming die filled with the feed liquid, wherein the feed liquid is uniformly distributed on the inner wall of the forming die; and plasticizing the material liquid in the rotating forming die to form the medical catheter.
According to an embodiment of the present invention, the step of plasticizing the material liquid in the forming mold further includes heating the material liquid in the rotating forming mold to make the temperature of the material liquid reach a plasticizing temperature, thereby plasticizing the material liquid.
According to an embodiment of the present invention, in the step of heating the feed liquid passing through the rotating forming die, the heating temperature of the forming die is between 100 ℃ and 220 ℃.
According to an embodiment of the present invention, after the step of plasticizing the material liquid in the mold, the method further comprises cooling and shaping the plasticized material liquid to form the medical catheter.
According to an embodiment of the present invention, the material of the feed liquid includes PVC emulsion and/or TPU emulsion.
According to an embodiment of the present invention, in the step of rotating the forming mold filled with the feed liquid, the rotation speed of the forming mold is between 50 to 350 rad/min.
According to an embodiment of the present invention, the step of rotating the forming mold filled with the feed liquid further includes preheating the rotating forming mold.
According to an embodiment of the present invention, before the step of injecting the material liquid into the forming mold, the step of preheating the material liquid is further included.
The invention provides a medical catheter which is formed by the forming process of the medical catheter.
According to an embodiment of the present invention, the medical catheter is a straight tube, a reducer tube or a special tube.
In the embodiment of the invention, the material liquid in the forming die is uniformly distributed on the inner wall of the forming die by rotating the forming die, the material liquid in the forming die is plasticized in the state of keeping the forming die rotating, the medical catheter can be formed at one time, the forming efficiency is high, the demolding can be performed quickly, and the wall of the formed medical catheter is uniform in thickness and high in quality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic step view of a process for forming a medical catheter in accordance with a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of a first embodiment of the present invention after the feed liquid has been plasticized in the forming die;
FIG. 3 is a schematic view of a medical catheter according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a forming die for a medical catheter in accordance with a first embodiment of the present invention;
FIG. 5 is a schematic view of a molding apparatus according to a first embodiment of the present invention;
fig. 6 is a sectional view of the molding apparatus of the first embodiment of the present invention;
FIG. 7 is an enlarged view of area A of FIG. 6;
FIG. 8 is a cross-sectional view at another angle of the molding apparatus of the first embodiment of the present invention;
FIG. 9 is a schematic view of a medical catheter molding apparatus according to a second embodiment of the present invention;
FIG. 10 is a cross-sectional view of a medical catheter molding apparatus according to a second embodiment of the present invention;
fig. 11 is an enlarged view of the region B of fig. 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Please refer to fig. 1, fig. 2 and fig. 3, which are schematic diagrams illustrating steps of a process for forming a medical catheter, a cross-sectional view of a material liquid plasticized in a forming mold, and a schematic diagram illustrating the medical catheter according to a first embodiment of the present invention. As shown in the figure, the forming process of the medical catheter of the present embodiment is to perform step S11 first, and provide a forming mold 2 having a tubular inner cavity; next, step S13 is executed to provide a material liquid for manufacturing the medical catheter 1, and the material liquid is injected into the tubular cavity of the forming mold 2, wherein the amount of the material liquid injected into the forming mold 2 is determined according to the wall thickness of the medical catheter 1 to be manufactured, and the material liquid includes any one or more of PVC (polyvinyl chloride) emulsion, TPU (polyurethane) emulsion, and other medical materials that can be used for manufacturing the medical catheter 1 and meet the biocompatibility.
Step S15 is executed again, the forming mold 2 with the material liquid is rotated, the material liquid in the forming mold 2 is gradually and uniformly distributed on the inner wall of the forming mold 2 in the natural flow by the rotating centrifugal force, wherein the rotating speed of the forming mold 2 is between 50rad/min and 350 rad/min.
Finally, step S17 is executed to plasticize the material liquid in the rotating molding die 2 to form the medical catheter 1 of the present embodiment. Specifically, after the material liquid in the forming mold 2 is uniformly attached to the inner wall of the forming mold 2 by rotation, the rotating forming mold 2 is heated, when the temperature of the heated material liquid reaches the molding temperature of the material liquid, the material liquid attached to the inner wall of the forming mold 2 is gradually plasticized, and hollow guide pipes with consistent pipe wall thickness are formed in the forming mold 2, wherein the heating temperature of the forming mold 2 is between 100 ℃ and 220 ℃, and the heating temperature can be adaptively adjusted according to the different molding temperatures of the material liquid. Cooling and shaping the hollow catheter to form the medical catheter 1 in the forming mold 2 (as shown in fig. 2), and finally taking out the medical catheter 1 from the forming mold 2 (as shown in fig. 3). In the present embodiment, the forming mold 2 filled with the material liquid is rotated in advance, so that the material liquid in the forming mold 2 is attached to the inner wall of the forming mold 2, and then the material liquid attached to the inner wall of the forming mold 2 is heated and plasticized, and the forming mold 2 is rotated continuously during the plasticizing process, so that the material liquid in the forming mold 2 is fully plasticized, thereby forming the medical catheter 1 of the present embodiment, wherein the pre-rotation time is controlled to be between 1min and 3min, and the plasticizing time of the forming mold 2 is between 3min and 7 min. Wherein.
In the molding process of the present embodiment, before step S13 is performed, the feed liquid may be preheated, and then the feed liquid is injected into the tubular cavity of the molding die 2, so that the preheated feed liquid has good fluidity, and the preheated feed liquid can be attached to the inner wall of the molding die 2 more quickly in the process of rotating the molding die 2 filled with the feed liquid in step S15, thereby shortening the pre-rotation time.
Alternatively, in step S15, the forming die 2 may be preheated at the same time, so as to increase the temperature of the material liquid in the forming die 2, improve the fluidity of the material liquid, and accelerate the material liquid to be uniformly attached to the inner wall of the forming die 2. Meanwhile, the temperature of the material liquid in the forming die 2 can reach the molding temperature of the material liquid more quickly, the plasticizing efficiency can be accelerated, the forming time of the medical catheter is shortened, and the forming efficiency of the formed medical catheter 1 is improved.
Fig. 4 is a schematic view of a molding die according to a first embodiment of the present invention. As shown in the drawings, the medical catheter 1 formed by the process of the present embodiment may be in the form of a straight tube, a reducer tube or a special-shaped tube, in other words, the medical catheter 1 is in the form of a tubular inner cavity of the forming mold 2, so the tubular inner cavity of the forming mold 2 may be in a straight-through type, a reducer type or a different type. In the present embodiment, the medical catheter 1 is in the form of a reducing tube, and the tubular inner cavity of the molding die 2 is of a reducing type. The length of the medical catheter 1 is determined according to the length of the forming mold 2, and when the length of the medical catheter 1 to be formed is longer, the length of the forming mold 2 is increased, and the rigidity of the forming mold 2 is increased along with the increase of the length of the forming mold 2, so that the medical catheter 1 is prevented from being deformed due to the deformation of the forming mold 2 in the manufacturing process.
The forming mold 2 of the present embodiment includes the first body 21 and the second body 23, the first body 21 and the second body 23 respectively have the first space 211 and the second space 231, and when step S11 is executed, the first body 21 and the second body 23 are assembled first, so that the first space 211 and the second space 231 form the tubular cavity of the forming mold 2 of the present embodiment. One end of the assembled first body 21 and the second body 23 is a closed end, and the other end is provided with a glue injection port 25. When step S13 is executed, the liquid may be injected from the injection gate 25 into the tubular cavity of the molding die 2. After the injection of the feed liquid is completed, the glue injection port 25 is closed to prevent the feed liquid in the tubular inner cavity from flowing out. The forming mold 2 of the present embodiment further includes a sealing member 27 matching with the glue injection port 25, and the sealing member 27 seals the glue injection port 25, wherein the sealing member 27 is a plug or a cover, and if the sealing member 27 is a plug, it can be plugged into the glue injection port 25 to seal the glue injection port 25; if the sealing member 27 is a cover, it can cover the glue filling opening 25 to seal the glue filling opening 25. When the sealed mold 2 is subjected to steps S15 and S17 and the medical catheter 1 is molded in the mold 2, the medical catheter 1 can be taken out of the mold 2 by separating the first body 21 and the second body 23.
The sealing member 27 further has a vent 271, when the vent 271 is communicated with the tubular cavity of the forming mold 2, when step S17 is executed, the air in the forming mold 2 is expanded due to heat, so that the air pressure in the forming mold 2 is increased, the air in the forming mold 2 can be discharged out of the forming mold 2 through the vent 271, and the air pressure in the forming mold 2 can be balanced, and similarly, in the process of cooling and shaping the hollow catheter, the air pressure in the forming mold 2 is decreased, and the air pressure inside and outside the forming mold 2 can be balanced through the vent 271, so as to avoid that the atmospheric pressure is higher than the air pressure in the forming mold 2, so that when the medical catheter 1 molded in the forming mold 2 is taken out, the first body 21 and the second body 23 connected to each other can be quickly opened.
In the present embodiment, steps S15 and S17 of the process of the present embodiment are executed, and the molding die 2 is mainly set in the molding machine and rotated and heated. The structure of the forming apparatus is described in detail below, and reference is made to fig. 5, 6, 7 and 8, which are a schematic view, a sectional view and an enlarged view of a region a in fig. 6 of the forming apparatus according to the first embodiment of the present invention. As shown in the figure, in the present embodiment, the molding apparatus 3 includes a clamping mechanism 30, a driving mechanism 31 and a heating device 32, the clamping mechanism 30 has a clamping driving shaft 301 and a clamping linkage shaft 302 opposite to the clamping driving shaft 301, and the driving mechanism 31 is disposed on one side of the clamping mechanism 30 and connected to the clamping driving shaft 301. The heating device 32 is disposed below the clamping mechanism 30, and the extending direction of the heating device 32 is parallel to the line connecting the axial center of the clamping driving shaft 301 and the axial center of the clamping interlinking shaft 302. When the molding die 2 is clamped by the clamping driving shaft 301 and the clamping interlocking shaft 302, the axis of the molding die 2 and the connecting line of the axis of the clamping driving shaft 301 and the axis of the clamping interlocking shaft 302 are located on the same line, the heating device 32 is located right below the connecting line of the axis of the clamping driving shaft 301 and the axis of the clamping interlocking shaft 302, and the molding die 2 is closest to the heating device 32. The driving mechanism 31 drives the clamping driving shaft 301 to rotate, the clamping driving shaft 301 drives the forming mold 2 to rotate by taking the axis as the center line, and the clamping linkage shaft 302 rotates along with the rotation of the forming mold 2.
The clamping mechanism 30 further comprises a base plate 303, a fixed seat 304 and a movable seat 305, wherein the fixed seat 304 is disposed on the base plate 303, and the movable seat 305 is movably connected to the base plate 303 and moves relative to the fixed seat 304. The clamping driving shaft 301 is pivotally connected to the fixed base 304, and the clamping linking shaft 302 is pivotally connected to the movable base 305, and a connection line between the axis of the clamping driving shaft 301 and the axis of the clamping driving shaft extends along the length direction of the bottom plate 303 and is parallel to the bottom plate 303. Specifically, two opposite sliding grooves 3031 are disposed on the bottom plate 303 of the embodiment, the extending direction of the two sliding grooves 3031 and a connecting line between the axis of the clamping driving shaft 301 and the axis of the clamping linkage shaft 302 are parallel to each other, and the movable seat 305 is movably connected to the two sliding grooves 3031 to move along the two sliding grooves 3031 relative to the fixed seat 304, so that the distance between the clamping driving shaft 301 and the clamping linkage shaft 302 can be adjusted according to the length of the molding die 2.
The movable base 305 further includes two guide members 3051, and in this embodiment, the two guide members 3051 are slidably disposed in the sliding grooves 3031, respectively. Specifically, the chute 3031 of the present embodiment has a reverse T shape, the guide 3051 has a corresponding reverse T shape, and a gap is provided between the guide 3051 and the wall of the chute 3031, so that the guide 3051 can slide relative to the chute 3031.
The movable seat 305 further has two locking members 3052, in this embodiment, the number of the locking members 3052 is two, and the two locking members 3052 are respectively located at two sides of the two sliding grooves 3031, which are relatively far away from each other. Specifically, retaining member 3052 of this embodiment is locking screw, every locking screw corresponds bottom plate 303 and sets up, retaining member 3052 is screwed up, the clearance between the cell wall of guide 3051 and spout 3031 reduces gradually, when retaining member 3052 and guide 3051 centre gripping bottom plate 303, sliding seat 305 locks in bottom plate 303, the distance between fixing base 304 and sliding seat 305 is fixed, loosen retaining member 3052, adjust the distance between fixing base 304 and the sliding seat 305, forming device 3 of this embodiment can be used for the medical catheter 1 of the different length of shaping.
The fixing base 304 has a fixing shaft hole, and the clamping driving shaft 301 passes through the fixing shaft hole of the fixing base 304. Similarly, the movable base 305 has a movable shaft hole, and the clamping coupling shaft 302 is disposed through the movable shaft hole of the movable base 305. Bearings 306 are arranged between the fixed shaft hole and the clamping driving shaft 301 and between the movable shaft hole and the clamping linkage shaft 302, and the bearings 306 can enable the clamping driving shaft 301 and the clamping linkage shaft 302 to smoothly rotate in the fixed shaft hole and the movable shaft hole respectively.
The end of the clamping driving shaft 301 facing the clamping linkage shaft 302 is provided with a fixing clamping groove 3011, the cross-sectional shape of the end of the forming die 2 connected to the clamping driving shaft 301 matches with the cross-sectional shape of the fixing clamping groove 3011, so that the end of the forming die 2 is fixed on the clamping driving shaft 301 by being connected with the fixing clamping groove 3011, and the clamping driving shaft 301 drives the forming die 2 to rotate.
The clamping linkage shaft 302 includes a rotation shaft portion 3021, a clamping shaft portion 3022, and an elastic member 3023, the clamping shaft portion 3022 is disposed through the rotation shaft portion 3021, and the elastic member 3023 is disposed between the clamping shaft portion 3022 and the rotation shaft portion 3021. The clamp shaft portion 3022 is movable relative to the rotary shaft portion 3021 to compress the elastic member 3023 and increase the distance between the clamp shaft portion 3022 and the clamp driving shaft 301, thereby facilitating the placement of the molding die 2. The end of the clamping shaft portion 3022 facing the clamping driving shaft 301 is provided with a linkage clamping groove 30221, the end of the forming die 2 close to the clamping linkage shaft 302 is connected with the linkage clamping groove 30221, the cross-sectional shape of the linkage clamping groove 30221 matches with the cross-sectional shape of the end of the forming die 2 close to the clamping linkage shaft 302, so that the end of the forming die 2 close to the clamping linkage shaft 302 is fixed on the clamping linkage shaft 302 by being connected with the linkage clamping groove 30221, and the forming die 2 driven by the clamping driving shaft 301 drives the clamping linkage shaft 302 to rotate.
The rotation shaft portion 3021 has an accommodating groove 30211 at an end facing the clamp driving shaft 301, the elastic member 3023 is disposed in the accommodating groove 30211, the clamp shaft portion 3022 passes through the elastic member 3023 and the rotation shaft portion 3021, and an end of the clamp shaft portion 3022 having the interlocking engaging groove 30221 is located in the accommodating groove 30211, so that the accommodating groove 30211 can limit the position of the elastic member 3023, and the elastic member 3023 can be located between the rotation shaft portion 3021 and the clamp shaft portion 3022. The clamping linkage shaft 302 further comprises a handle 3024, the handle 3024 is connected with one end of the clamping shaft portion 3022, which is far away from the clamping drive shaft 301, when the clamping linkage shaft 302 is used, the clamping shaft portion 3022 is pulled by the handle 3024 to move in a direction far away from the clamping drive shaft 301, so that the distance between the clamping shaft portion 3022 and the clamping drive shaft 301 is increased, the forming die 2 is easy to place between the clamping drive shaft 301 and the clamping linkage shaft 302, and the forming die 2 is also convenient to take out from between the clamping drive shaft 301 and the clamping linkage shaft 302.
The driving mechanism 31 is disposed on the bottom plate 303 and is located at one side of the fixing base 304. The driving mechanism 31 includes a driver 311 and a driving controller 312, the driving controller 312 is electrically connected to the driver 311, and the driver 311 is connected to the clamping driving shaft 301 to drive the clamping driving shaft 301 to rotate. In this embodiment, the driver 311 is a motor, and the driving controller 312 is used to control the start and stop of the motor and adjust the rotation speed of the motor. The driving mechanism 31 further includes a transmission structure 313, and the transmission structure 313 is respectively connected to the driver 311 and the clamping driving shaft 301, in this embodiment, the transmission structure 313 is a transmission belt, but the transmission structure 313 may also be a gear or other transmission structures.
The heating device 32 includes a heating pipe 321 and a temperature controller 322 electrically connected to the heating pipe 321, wherein the heating pipe 321 is disposed on the bottom plate 303, one end of the heating pipe 321 penetrates through the movable seat 305, and the temperature controller 322 is configured to control opening and closing of the heating pipe 321, or adjust a heating temperature of the heating pipe 321, so that the forming apparatus 3 of the present embodiment can adjust the heating temperature according to a molding temperature of the material liquid in a process of forming the medical catheter 1. In the present embodiment, the heating pipe 321 is an infrared heating pipe, but may be an electromagnetic heating pipe or other heating pipes.
The molding apparatus 3 of the present embodiment further includes a warming cover 33, and one end of the warming cover 33 is pivotally connected to the base plate 303 and located on one side of the chucking mechanism 30. When the driving mechanism 31 drives the forming mold 2 to rotate through the clamping mechanism 30 and the heating device 32 heats the forming mold 2, the temperature-rising cover 33 rotates relative to the bottom plate 303 to cover the clamping mechanism 30, the inner wall of the temperature-rising cover 33 abuts against the partition plates 307 of the fixed seat 304 and the movable seat 305, so that the forming mold 2 arranged on the clamping mechanism 30 is located in a heating space formed by the temperature-rising cover 33, the two partition plates 307 and the bottom plate 303, and heat energy generated by the heating device 32 is uniformly distributed in the heating space to uniformly heat the forming mold 2.
In the present embodiment, the plurality of auxiliary heating devices 34 are further disposed on the inner wall of the temperature-increasing cover 33 at intervals, in the present embodiment, the auxiliary heating devices 34 are infrared heating pipes, the plurality of auxiliary heating devices 34 are respectively electrically connected to the temperature controller 322, and the temperature controller 322 controls the plurality of auxiliary heating devices 34 to be turned on and off, or adjusts the heating temperature. The extending direction of each auxiliary heating device 34 is parallel to the connecting line of the axis of the clamping driving shaft 301 and the axis of the clamping linkage shaft 302, the heating device 32 heats the lower part of the forming mold 2, and the plurality of auxiliary heating devices 34 heat the upper part of the forming mold 2, so that the forming mold 2 is heated uniformly. In the present embodiment, the temperature rising lid 33 is an arc lid, the number of the auxiliary heating devices 34 is two, and the distances from each of the auxiliary heating devices 34 to the molding die 2 from the heating device 32 are equal to each other, so that the heating intensity of the molding die 2 by the heating device 32 and each of the auxiliary heating devices 34 is the same. In addition, the heating device 32 and each auxiliary heating device 34 are equally spaced around the forming mold 2, so that the forming mold 2 is uniformly heated.
From the above, the forming process of the medical catheter 1 of the invention can continuously form the medical catheter 1 of the invention in a one-step forming mode through the forming device 3 and the plurality of forming dies 2, has the advantages of simple operation, rapid demoulding, high forming efficiency, independent space of the tubular inner cavity of the forming die 2, reduced impurity infiltration, improved product quality, the material liquid in the forming die 2 is gradually heated and plasticized in a natural flowing state, the shape of the outer wall of the medical catheter 1 after cooling and shaping corresponds to the shape of the inner wall of the forming die 2, the inner wall of the medical catheter 1 has a shape corresponding to the outer wall of the medical catheter 1, so that the variable diameter medical catheter 1 with a uniform wall thickness is formed, but the inner wall of the medical catheter 1 does not contact with the forming mold 2 in the forming process, so that the smoothness of the inner wall of the medical catheter 1 is high, and blood can flow more smoothly in the medical catheter 1 with a variable diameter.
Please refer to fig. 9, 10 and 11, which are a schematic diagram, a sectional view and an enlarged view of a region B of fig. 10 of a molding apparatus according to a second embodiment of the present invention. As shown in the drawings, in the first embodiment, the material liquid is injected manually, the molding apparatus 3 of the present embodiment further has a glue injector 35, the glue injector 35 injects the material liquid into the tubular inner cavity of the molding die 2 automatically through a glue injection pipe 351, specifically, a glue injection hole 3025 is formed in the clamping linkage shaft 302 of the present embodiment, one end of the glue injection pipe 351 is connected to the glue injector 35, and the other end of the glue injection pipe passes through the glue injection hole 3025 and the glue injection hole 25 and is located in the tubular inner cavity of the molding die 2, so that the automatic glue injector 35 injects the material liquid into the tubular inner cavity of the molding die 2 through the glue injection pipe 351.
The structure of the clamping linkage shaft 302 of the present embodiment is different from the structure of the clamping linkage shaft of the above embodiments, the clamping linkage shaft 302 of the present embodiment omits the arrangement of the rotation shaft and the elastic member, only the clamping shaft 3022 is retained, and the clamping shaft 3022 directly penetrates through the bearing 306 of the movable base 305. The injection hole 3025 penetrates the grip shaft portion 3022 and communicates with the interlocking notch 30221. Of course, the clamping linkage shaft 302 of the present embodiment can also be the same as the clamping linkage shaft of the above embodiments, and will not be described herein again.
In this embodiment, the glue injection pipe 351 includes a first pipe 351a and a second pipe 351b connected to the first pipe 351a, the first pipe 351a is connected to the glue injector 35, the second pipe 351b passes through the glue injection hole 3025 and the glue injection port 25 of the clamping linkage shaft 302 to communicate with the tubular cavity of the forming mold 2, and the outer diameter of the second pipe 351b is smaller than the outer diameter of the first pipe 351a, so that the speed of the feed liquid entering the tubular cavity of the forming mold 2 can be accelerated. The external diameter of second body 351b is less than the internal diameter of injecting glue mouth 25, has the space between the outer wall of second body 351b and the inner wall of injecting glue mouth 25, so the tubulose inner chamber of forming die 2 communicates with the external world through this space to atmospheric pressure in the in-process balance forming die 2 of shaping medical catheter 1, even atmospheric pressure in the forming die 2 is the same with external atmospheric pressure, and let the medical catheter 1 after the cooling shaping take out in forming die 2 fast. In the present embodiment, since the automatic injection is adopted, the provision of the sealing member of the molding die 2 is omitted, and the function of the gap between the glue injection port 25 and the second tube 351b is the same as the function of providing the vent hole in the sealing member.
Meanwhile, the end of the forming die 2 connected with the clamping and linking shaft 302 is not completely abutted against the bottom of the linking clamping groove 30221, the outer diameter of the second tube 351b is smaller than the inner diameter of the glue injection hole 3025 for clamping and linking the shaft 302, the gas exhausted from the forming die 2 flows to the outside from the gap between the end surface of the forming die 2 and the linking clamping groove 30221 and the gap between the second tube 351b and the glue injection hole 3025, and similarly, the external gas can also flow into the forming die 2 from the gap between the end surface of the forming die 2 and the linking clamping groove 30221 and the gap between the second tube 351b and the glue injection hole 3025, so that the air pressure of the tubular inner cavity of the forming die 2 is balanced.
In the present embodiment, the glue injection pipe 351 is further provided with a control valve 353, and the control valve 353 is used for controlling the amount of the material liquid injected into the forming mold 2, so that the forming apparatus 3 of the present embodiment can accurately control the wall thickness of the formed medical catheters 1 with different lengths, and improve the forming efficiency.
In summary, according to the medical catheter and the molding process thereof provided by the invention, the medical catheter can be molded at one time through the molding process, the molding efficiency is high, meanwhile, the contact with the external environment is avoided, the probability of impurity mixing is reduced, in the molding process, the material liquid is continuously and uniformly distributed through rotation in the molding die, the thickness of the wall of the molded medical catheter is consistent, the quality is high, the mold can be rapidly removed after molding, and the medical catheter can adapt to catheter products of various specifications.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A process for forming a medical catheter, comprising the steps of:
providing a forming die having a tubular inner cavity;
injecting a feed liquid into the tubular inner cavity of the forming die;
rotating the forming die filled with the feed liquid to uniformly distribute the feed liquid on the inner wall of the forming die;
plasticizing the feed liquid within the rotating forming die to form a medical catheter.
2. The process for forming a medical catheter according to claim 1, wherein the step of plasticizing the feed liquid in the forming die further comprises plasticizing the feed liquid by heating the feed liquid in the rotating forming die to bring the temperature of the feed liquid to a molding temperature.
3. The process for forming a medical catheter according to claim 2, wherein the step of heating the feed solution through the rotating forming die has a heating temperature of 100 to 220 ℃.
4. The process for forming a medical catheter according to claim 2, wherein the step of plasticizing the liquid in the forming mold further comprises cooling and shaping the plasticized liquid to form the medical catheter.
5. The process for forming a medical catheter according to claim 1, wherein the feed solution comprises a PVC emulsion and/or a TPU emulsion.
6. The process for forming a medical catheter according to claim 1, wherein the step of rotating the forming mold filled with the feed liquid is performed at a rotation speed of 50 to 350 rad/min.
7. The process for forming a medical catheter as claimed in claim 1, wherein the step of rotating the forming die with the feed liquid further comprises preheating the rotating forming die.
8. The process for forming a medical catheter according to claim 1, wherein the step of injecting the feed liquid into the forming die further comprises preheating the feed liquid.
9. A medical catheter, wherein the medical catheter is formed by a forming process of the medical catheter according to any one of claims 1 to 8.
10. The medical catheter of claim 9, wherein said medical catheter is a straight tube, a reducer tube, or a profiled tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811574345.2A CN111300705A (en) | 2018-12-21 | 2018-12-21 | Medical catheter and forming process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811574345.2A CN111300705A (en) | 2018-12-21 | 2018-12-21 | Medical catheter and forming process thereof |
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| CN111300705A true CN111300705A (en) | 2020-06-19 |
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| CN201811574345.2A Pending CN111300705A (en) | 2018-12-21 | 2018-12-21 | Medical catheter and forming process thereof |
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| CN (1) | CN111300705A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040005423A1 (en) * | 2000-05-12 | 2004-01-08 | Dalton Paul D. | Method of producing structures using centrifugal forces |
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2018
- 2018-12-21 CN CN201811574345.2A patent/CN111300705A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040005423A1 (en) * | 2000-05-12 | 2004-01-08 | Dalton Paul D. | Method of producing structures using centrifugal forces |
Non-Patent Citations (2)
| Title |
|---|
| 谢荣华: "《塑料购销手册》", 31 May 1994, 中国物资出版社 * |
| 陈百名: "《铸造工艺及设计》", 30 November 2016, 北京理工大学出版社 * |
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