JPH0239467Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an apparatus for manufacturing an indwelling needle that is fitted as an outer needle into a metal cannula of a syringe.

[Prior Art] In general, this type of indwelling needle is inserted into the body together with a metal injection cannula when continuously injecting a medicinal solution into the body's vascular system, and after the injection cannula is removed, it is inserted into the body as it is. Secure it with tape etc. to
It is used by connecting to other drug injectors.

However, since the base material of conventional indwelling needles is made of a flexible synthetic resin tube, when the indwelling needle is fitted into the injection cannula, the injection cannula and the indwelling needle at the insertion tip are not easily connected to each other. A stepped portion corresponding to the wall thickness of the tube is created between the tubes, which creates a large resistance when the tube is inserted into the body, which not only injures the body and causes severe pain, but also tends to result in incomplete insertion.

Conventionally, in order to solve the above-mentioned problems, various measures have been taken to polish the tip of the indwelling needle so that a step does not form between it and the injection cannula.

[Problems to be solved by the invention] However, in the case of such conventionally structured indwelling needles, polishing of the tip part during the manufacturing stage requires a great deal of time and effort, and the tube that forms the indwelling needle requires a lot of effort and time. Normally, the inner diameter of the indwelling needle is slightly larger than the outer diameter of the injection cannula to make it easier to fit into the injection cannula. Even if the injection cannula is inserted, there will be a gap between the needle and the injection cannula, and this gap may cause injury to the body during insertion.

Furthermore, as disclosed in Japanese Patent Publication No. 49-5433, a preformed tube made of a flexible synthetic resin that becomes an indwelling needle is attached to a core member having the same outer diameter as that of a metal injection cannula. By heating and melting the preformed tube at a position corresponding to the insertion tip of the indwelling needle while rotating, and stretching and burning off that part, the insertion tip of the indwelling needle is made thinner, and at the same time, the injection cannula is formed. There are known manufacturing methods that improve the adhesion to the indwelling needle, but in such manufacturing methods, the insertion tip of the indwelling needle is simply stretched by heating and melting, and then further stretched and cut into pieces. The tip of the shredded piece is extremely thin and fragile, and its strength is extremely weak.Furthermore, when the elongated tip of the shredded piece contracts, it becomes uneven and tends to curl up, so the tip of the shredded piece is If such an indwelling needle is inserted into a metal injection cannula and inserted into the body, the insertion tip of the indwelling needle may wrinkle due to resistance from the subcutaneous tissue. The problem was that it was difficult to penetrate internal arteries and veins because the needles became bellows-like and faced great resistance even when they reached internal arteries and veins.

[Purpose of the invention] This invention was made under the above circumstances, and its purpose is to make it possible to smoothly insert it into the body in conjunction with a metal injection cannula, and to have a molded An object of the present invention is to provide an indwelling needle manufacturing device that can improve performance and productivity.

[Means for solving the problem] In order to achieve the above purpose, this invention
A manufacturing device for manufacturing an indwelling needle made of a flexible synthetic resin that is fitted into a metal injection cannula and has a tapered opening at one end base, wherein the one end base side is made into a tapered opening and the other end is made into a tapered opening. a rotary holder in which a preformed tube whose side is preformed to have an inner diameter slightly larger than the outer diameter of the injection cannula is loaded and held along a rotating shaft with both cut ends thereof protruding; a rotatable molding bush that is press-fitted into the tapered opening end of the held preformed tube to position and fix the preformed tube in the direction of the rotational axis of the rotary holder; a rotatable molded core rod having an outer diameter that is the same as the outer diameter of the injection cannula, which is inserted into the preformed tube loaded and held in the rotary holder; and the preformed tube loaded and held in the rotary holder. first and second heating mechanisms that locally heat predetermined cutting positions on both protruding ends of the tube, and grasping the other end of the preformed tube heated by the first heating mechanism; a chuck for stretching the other end heating portion in the axial direction; a cooling mechanism for cooling the other end heating portion of the preformed tube stretched by the chuck; and a cooling mechanism for cooling the other end heating portion of the preformed tube stretched by the chuck; The molded bushing and the molded mandrel are configured to be rotatable in synchronization with the rotary holder during heating and cutting.

In this case, the rotary holder can be temporarily stopped during stretching by gripping the chuck on the other end heating section side of the preformed tube immediately after heating, and the taper of the preformed tube can be adjusted by heating by the second heating mechanism. The open end is melted and brought into close contact with the molding bush, and the chuck is released from the grip after stretching the other end of the preformed tube toward the heating section. When cutting with
Furthermore, it is preferable that the preformed molded tube after cutting can be pulled out from the rotary holder by retracting the molding bush.

[Function] That is, by having the above-mentioned structure, this device has one end proximal side formed into a tapered opening and the other end side preformed to have an inner diameter slightly larger than the outer diameter of the injection cannula. The preformed tube is fitted into a molded core rod having an outer diameter that is the same as the outer diameter of the injection cannula, and the other end of the preformed tube is locally heated at a position corresponding to the cut end. While holding the other end side, it is stretched in the axial direction, and after heating the stretching and releasing the grip on the other end, it is cooled, and both ends of the preformed tube are cut into a predetermined length with a cutter. This makes it possible to cut and remove the extremely thin and fragile stretched tip, and the cut end surface of the piercing tip after cutting becomes extremely sharp.

In addition, the insertion tip of such an indwelling needle maintains relative strength even though it is thin like conventional needles, and does not curl up, so it can be inserted into a metal injection cannula and inserted into the body. When inserted into a blood vessel, it does not wrinkle and become bellows-like due to the resistance of the subcutaneous tissue, and as a result, even when it reaches internal arteries and veins, there is little resistance, allowing smooth insertion into blood vessels. can be done.

[Example] Hereinafter, this invention will be explained in detail with reference to an illustrated example.

As shown in FIGS. 1 and 2, numeral 1 in the figures is a syringe, and a metal injection cannula 3, which is an inner needle, is attached to the tip base 2 of the syringe. An indwelling needle 4 made of flexible synthetic resin and serving as an outer needle manufactured by a manufacturing device described later is fitted.

This indwelling needle 4 has an inner diameter slightly larger than the outer diameter of the injection cannula 3, has one end base 4a opened in a tapered shape, and is fitted into the base 3a of the injection cannula 3. At the same time,
The other end 4b, which serves as the piercing tip, has a narrowed diameter, a thinner wall thickness, and has a structure in which it is brought into close contact with the tip 3b of the injection cannula 3.

In order to manufacture the above-mentioned indwelling needle 4, as shown in FIG. A relatively long preformed tube 10 made of flexible synthetic resin was preformed, and this preformed tube 10 was loaded into an automatic cutting device to be described later, and the other end 10b, which will become the piercing tip, was drawn and thinned. After that, it is obtained by cutting it into a predetermined length.

Next, a cutting device as an indwelling needle manufacturing device according to the invention described above will be explained based on the embodiments shown in FIGS. 4 to 13.

In the figure, 11 is a base. A guide rail 12 is installed on this base 11, and this guide rail 12
A rotary holder 16 is provided above, which is rotatable by a drive motor 15 via a pulley 13 and a chain belt 14 . A loading portion 17 is formed through the rotary holder 16 to insert and hold the preformed tube 10 along the rotation axis with both cut ends 10a and 10b protruding outside. 17 has a tapered peripheral wall surface 17a into which a part of the tapered opening end 10a of the preformed tube 10 can be closely fitted.

Further, in the figure, reference numerals 18 and 19 denote first and second cutters having the rotary holder 16 installed with a predetermined interval therebetween, and the cutting edge portions are composed of plate blades 18a and 19a having an appropriate inclination angle θ. At the same time, it is positioned so as to correspond to the cutting positions of both cut ends 10a and 10b of the preformed tube 10 loaded in the rotary holder 16, and can be horizontally moved onto the rotation axis of the rotary holder 16. .

The first cutter 18 is movable so as to instantaneously push and cut the other end 10b of the preformed tube 10 loaded in the rotary holder 16, which becomes the piercing tip. 2
The cutter 19 presses its blade portion 19a against the outer periphery of the preformed tube 10 at a position corresponding to cutting on the tapered opening end 10a side for a certain period of time, and also prevents the coaxial rotation of the preformed tube 10 as the rotary holder 16 rotates. It is controlled by a movable mechanism 20 using a hydraulic cylinder to move the cutter.

Furthermore, in the figure, 21 and 22 are the rotary holder 16.
The first and second rotary bodies are slidably attached via sliders 23 and 24 to the guide rail 12 on the tapered opening end 10a side of the preformed tube 10 inserted and held in the loading section 17 of the While rotating coaxially with the rotating holder 16, this first
A molded core rod 25 having the same diameter as the outer diameter of the injection cannula 3 that passes through the rotation axis of the second rotary body 22 and is inserted into the preformed tube 10 is fixed to the rotary body 21. On the other hand, a molded bushing 26 is formed protruding from the second rotary body 22, through which the molded core rod 25 slides freely along the rotational center axis. Tapered peripheral wall surface 17a of loading section 17 of holder 16
An annular groove 27 is cut corresponding to the cutting position by the second cutter 19 in the press-fitted state.

The sliders 23 and 24 that support both the rotating bodies 21 and 22 engage with guide grooves 29 and 30 cut into the outer peripheral surface of the rotating drum 28, and are rotated by the drive motor 31 of the rotating drum 28. , is controlled to move forward or backward toward the rotary holder 16, and moves the molded core rod 25 toward the rotary holder 1.
6 is inserted into the preformed tube 10 loaded in the preformed tube 10, the molded bush 26 is inserted into the tapered opening end 10a of the preformed tube 10, and held and positioned, and the rotary holder 16 of the molded bush 26 is loaded. By press-fitting the first rotating body 21 to the second rotating body 22 through the press-fitting body 21a, the molded core rod 25 and the molded bushing are pressed together as the rotary holder 16 rotates. 26 are rotated synchronously.

Furthermore, in the figure, 32 and 33 are the rotary holder 16.
The preformed tube 10 loaded into the loading section 17 of
The first and second heating mechanisms are disposed corresponding to the cutting positions of both ends 10a and 10b, and have nozzles 32a and 33a for injecting hot air to the rotary holder 16 after loading the preformed tube. When the molded core rod 25 is inserted and the molded bush 26 is press-fitted, the positions corresponding to both cut ends of the preformed tube 10 coaxially rotated by the rotation of the rotary holder 16 are locally heated. By heating by the second heating mechanism 33, the tapered opening end 10b, which is the base of one end of the preformed tube 10, is melted and tightly attached to the molded bush 26 formed in the same shape as the base 3a of the injection cannula 3. As a result, the size of the tapered opening end of the preformed tube 10 after being cut by the second cutter 19 can be made to accurately match the size of the base 3a of the injection cannula 3. On the other hand, by retracting the molding bush 26, which will be described later, the preformed tube 10 can be easily pulled out from the rotary holder 16 after cutting while maintaining a close contact state.

Further, in the figure, numeral 34 denotes a chuck, which is slidable via a slider 35 on the guide rail 12 on the opposite side of the first and second rotating bodies 21 and 22, with the rotating holder 16 in between. is supported by
The gripping opening 34a of this chuck 34
is located on the rotation axis of the rotary holder 16, and slides the slider 35 toward the rotary holder 16 by the extension action of the first hydraulic cylinder 36, thereby gripping the other end 10b of the preformed tube 10. While positioning the rotary holder 16 at the closed position,
Simultaneously with the stop of the gripping opening 34 of the chuck 34, the second hydraulic cylinder 37 is extended.
After squeezing the other end 10b of the preformed tube by gripping the other end 10b of the preformed tube, the contraction operation of the first hydraulic cylinder 36 causes the other end 10b of the preformed tube that has just been heated and melted by the first heating mechanism 32 to be pivoted. After being stretched, the holding state is released by contracting the second hydraulic cylinder 37, and at the same time, the rotary holder 16 is rotated again and this rotation is In synchronization with the holder 16, the molded mandrel 25 and molded bush 26 are rotated again, whereby the stretched and heated other end 10c of the preformed tube 10 contracts and is evenly distributed around the molded mandrel 25. It is designed to allow close contact.

Furthermore, in the figure, reference numeral 38 denotes a cooling mechanism, which cools the stretched and heated portion 10c of the preformed tube 10, which rotates again at the same time as the chuck 34 is released, after the heated other end 10b of the preformed tube 10 is stretched. , is cooled by the cooling injection nozzle 38a, and thereby, when cutting by the cutter 18, the curled-up portion of the tip after shrinkage of the stretched and heated other end 10c of the preformed tube 10 is cut off and removed, and the deformation due to cutting is removed. It is now possible to prevent this.

Further, numeral 39 in the figure is an extruded collar that is slidably fitted into a molded bush 26 that is formed to protrude from the second rotating body 22 that slides on the guide rail 12. The push-out collar 39 engages with a push-out arm 40 that is slidably attached to the fixed portion of the second rotating body 22 along the rotational axis direction, and the push-out arm 40 is moved toward the rotating holder 16 by a spring 41. The guide rail 12 is biased in a direction opposite to the direction of extrusion toward the guide rail 12, and is provided on the fixed portion 11a of the base 11 that supports the guide rail 12 in a length adjustable manner when the second rotary body 22 is in the retracted position. The push-out arm 40 is moved forward against the biasing force of the spring 41, that is, toward the rotating holder 16, and the push-out collar 39 is pushed out. When pulling out the molded bushing 26 from the loading section 17 of the holder 16, this molded bushing 26
The extrusion collar 39, extrusion arm 4
0, a spring 41 and a stopper 42 constitute a product extrusion mechanism.

Therefore, in order to manufacture an indwelling needle using the above-mentioned cutting device, as shown in FIG.
Insert and hold. Next, the rotating drum 28
by rotating the first and second rotating bodies 20, 22.
A molded core rod 25 and a molded bush 26 supported by
The molded core rod 25 is moved forward toward the rotary holder 16, and as shown in FIG.
is inserted, and the tip 26a of the molded bush 26 is press-fitted into the open end 10a of the preformed tube 10, and the preformed tube 10 is positioned and fixed, and at the same time, the rotary holder 16 is rotationally driven, and the first and second
The molded core rod 25 and molded bush 26 are rotated synchronously with the preformed tube 10 by the synchronous rotation of the rotating bodies 21 and 22 by pressure contact.

In this state, the first and second heating mechanisms 32, 33
After activating the nozzles 32a and 33a to inject hot air toward the cutting positions of both ends 10a and 10b of the preformed tube 10 protruding from both sides of the rotary holder 16 to locally heat them,
At the same time as the rotation of the rotary holder 16 is temporarily stopped, the chuck 34 is moved to grip and hold the other end 10b of the preformed tube 10 immediately after heating, as shown in FIG. The heated and melted portion of the other end 10b of the preformed tube 10 is stretched by pulling in the axial direction. At this time, the stretched heating portion 10c of the preformed tube 10 has a thin wall, as shown in FIG. 9, and is in close contact with the outer peripheral surface of the molded core rod 25, which has the same diameter as the outer diameter of the metal injection cannula 3.

After the gripping state by the chuck 34 is released, the rotary holder 16 is rotated again to rotate the preformed tube 10, and at the same time, the cooling mechanism 38 is activated to inject cold air from the nozzle 38a of this cooling mechanism. The preformed tube 10
The stretching heating section 10c is cooled.

After cooling, the rotating drum 28 is rotated again,
At the same time as the molded core rod 25 is moved back from the position corresponding to the cutting of the other end of the preformed tube 10 by the first cutter 18, as shown in FIGS. 11 and 12, the first and second cutters 18 and 19 are The rotary holder 16 is moved horizontally in the axial direction, and the first
The blade portion 18a of the cutter 18 instantly presses and cuts the stretched other end of the cooled preformed tube 10, while the second cutter 19
The blade portion 19a is pressed against the tapered opening end 10a of the preformed tube 10 located corresponding to the annular groove 27 of the molding bush 26, and the preformed tube 10 is cut as it rotates.

Further, after cutting, the rotation of the rotary holder 16 is stopped, and at the same time, the rotary drum 28 is driven to rotate the molded core rod 25 and the molded bush 26.
, and pull out the preformed tube 10 from the rotary holder 16. At this time, the tapered opening end 10b of the preformed tube 10 after cutting is heated and melted by the second heating mechanism 33 to form the molded bush 26.
Since the preformed tube 10 is maintained in close contact with the molding bush 26, the preformed tube 10 is pulled out from the loading section 17 of the rotary holder 16 while being held in the molding bush 26. The removal of the preformed tube 10 after cutting is as follows:
As shown in FIG. 13, when the second rotary body 22 moves to a predetermined retreat position, the rear end 40a of the push-out arm 40 provided on the rotary body 22 is brought into contact with the stopper 42, and the push-out arm 40 is moved forward against the biasing force of the spring 41, and the push-out collar 39 that engages with the push-out arm 40 is slid forward, so that the push-out collar 39 is held in close contact with the tip 26a of the molded bush 26. The preformed tube 10 is extruded and removed.

By the way, in the above embodiment, the rotation control of the rotary holder 16, the movable control of the cutters 18 and 19, the rotation control of the rotary drum 28 for advancing or retracting the molding core rod 25 and the molding bush 26, and the gripping operation of the chuck 34 are performed. All hydraulic cylinder drive control etc. can be performed automatically.
It is also conceivable to automate the loading of preformed tubes into the rotary holder.

[Effects of the invention] As explained above, this invention enables the production of an indwelling needle made of flexible synthetic resin that is fitted into a metal injection cannula and has a tapered opening at one end. A preformed tube having a tapered opening on the base side and an inner diameter slightly larger than the outer diameter of the injection cannula on the other end side is molded to have the same outer diameter as the outer diameter of the injection cannula. Fitting the core rod and locally heating the other end of the preformed tube at a position corresponding to the cut end, holding the other end of the preformed tube and stretching it in the axial direction; After releasing the grip on the heated other end, it is cooled and both ends of the preformed tube are cut to a predetermined length with a cutter, so the extremely thin and fragile stretched tip is cut off. Therefore, the cut end surface of the piercing tip after cutting can be formed extremely sharply.

In addition, the insertion tip of such an indwelling needle can maintain relative strength even though it is thin like conventional needles, and since it does not curl up, it can be fitted into a metal injection cannula. When inserted into the body, it does not wrinkle and become bellows-like due to the resistance of the subcutaneous tissue, and as a result, internal arteries,
Since the resistance is small even when it reaches the vein, it has the excellent effect of being able to smoothly penetrate the blood vessel.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of use of the indwelling needle according to this invention, Fig. 2 is an enlarged sectional view of the main part in section A of Fig. 1, and Fig. 3 is a spare used for manufacturing the indwelling needle according to this invention. Explanatory drawings of the molded tube, and FIGS. 4 to 13 show an embodiment of the indwelling needle manufacturing apparatus according to this invention, in which FIG. 4 is a front view, FIG. 5 is a plan view, and FIG. Fig. 5 is an enlarged sectional view of the main part taken along the line, Fig. 7 is an explanatory diagram showing the state of insertion and fitting of the molded core rod and the molded bush into the rotary holder, and Figs. 8 and 9 show the movable state of the chuck. FIG. 10 is an explanatory diagram showing the moving state of the molded mandrel just before cutting, FIG. 11 is an explanatory diagram showing the movable state of the first cutter along the line in FIG. FIG. 13 is an explanatory diagram showing the movable state of the second cutter along the line 1-2, and FIG. 13 is an enlarged sectional view of the main part of the product extrusion mechanism. 3... Metal cannula, 4... Indwelling needle, 4a...
...Taper base, 4b...Piercing tip, 10...
Preformed tube, 10a...Tapered opening end,
10b...Other end, 11...Base, 12...Guide rail, 15...Drive motor, 16...Rotary holder, 17...Loading section, 18, 19...Cutter, 18a, 19a...Blade Part, 20... Movable mechanism, 21, 22... Rotating body, 23, 24... Slider, 25... Molded core rod, 16... Molded bush, 27... Annular groove, 28... Rotating drum, 2
9, 30... Guide groove, 31... Drive motor, 3
2, 33... heating mechanism, 34... chuck, 35
...Slider, 36, 37...Hydraulic cylinder, 3
8... Cooling mechanism, 39, 40, 41, 42... Product extrusion mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A manufacturing device for manufacturing an indwelling needle made of flexible synthetic resin that is fitted into a metal injection cannula and has a tapered opening at one end base, which A preformed tube is preformed with a tapered opening on the base side and an inner diameter slightly larger than the outside diameter of the injection cannula on the other end side, and is loaded and held along the rotation axis with both cut ends protruding. a rotatable molded bush that is press-fitted to the tapered opening end of the preformed tube loaded and held in the rotary holder to position and fix the preformed tube in the direction of the rotational axis of the rotary holder; , a rotatable molded core rod having an outer diameter that is the same as the outer diameter of the injection cannula, which passes through the rotation center axis of the molded bushing and is inserted into the preformed tube loaded and held in the rotary holder; first and second heating mechanisms that locally heat predetermined cutting positions on both protruding end sides of the preformed tube loaded and held in the rotary holder; and a chuck that grips the other end side of the preformed tube and stretches the other end heating section in the axial direction; a cooling mechanism that cools the other end heating section of the preformed tube that has been stretched by the chuck; and first and second cutters for cutting both ends of the preformed tube to a predetermined length, and the molding bush and the molding core rod are capable of rotating synchronously with the rotary holder during heating and cutting. An indwelling needle manufacturing device characterized by: (2) The rotary holder is rotatably provided on a guide rail installed on the base of the device by a drive motor via a pulley and a chain belt, and is attached to the other end of the preformed tube immediately after heating on the side of the heating section. The device for producing an indwelling needle according to claim 1, which is a utility model, and is capable of being temporarily stopped during stretching by gripping the chuck. (3) The molded bush is formed to protrude from the second rotating body of the first and second rotating bodies that are slidably attached to the guide rail via a slider, and the slider is attached to the rotating drum. The rotary drum is controlled to move forward or backward toward the rotary holder by rotational drive by the drive motor of the rotary drum, and the tapered opening end of the preformed tube is melted by heating by the second heating mechanism. The device for manufacturing an indwelling needle according to claim 1, wherein the indwelling needle manufacturing device is brought into close contact with each other when the indwelling needle is pressed. (4) The chuck is slidably supported via a slider on a guide rail on the opposite side of the first and second rotating bodies with the rotary holder in between, and the chuck has a gripping opening. is located on the rotation axis of the rotary holder, slides the slider toward the rotary holder by the extension action of the first hydraulic cylinder, and simultaneously moves the slider to the second hydraulic cylinder when the rotary holder stops.
After the grasping opening is squeezed by the extension action of the hydraulic cylinder and the other end of the preformed tube is grasped, the contraction action of the first hydraulic cylinder causes the reserve immediately after heating and melting by the first heating mechanism. The device for manufacturing an indwelling needle according to claim 1, which is configured to stretch the other end of the molded tube in the axial direction and release the grip after the stretching. (5) The molded mandrel is provided to penetrate the molded bush and to be slidable along its rotation center axis, and when the first cutter cuts the preformed tube, the other end of the preformed tube is stretched. The device for manufacturing an indwelling needle according to claim 1, wherein the indwelling needle manufacturing device is retracted to the rear of the position. (6) The molded bush is retracted by the rotational drive of the rotary drum, with sliders of the first and second rotary bodies engaging with guide grooves formed on the outer peripheral surface of the rotary drum; The device for manufacturing an indwelling needle according to claim 1, wherein the cut preformed tube can be pulled out from the rotary holder as the tube is retracted.