JP2761323B2 - Flow adjusting device such as catheter and flow adjusting device manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for catheters and other similar devices and a method of manufacturing the same.

[0002]

2. Description of the Related Art It is generally well known that it is very difficult to precisely control a fluid injected into a human body by a catheter or the like. This is because the controlled flow rate is small, and there is a great need for something that can be easily adjusted. Known devices include devices that progressively suppress the tube by lateral or diametrical compression, or devices that partially block the tube and introduce fluid into the human body.
It is further known to reduce the fluid passage cross-section by closing the longitudinal extension of the tube internally with a solid nucleus. However, the known device described above has a defect in flow grading due to the narrow flow path, and has a drawback that the step is delayed or advanced. Also, liquid particles can become stuck in small passages and change the flow state after the fluid is adjusted to the required speed. The above drawbacks render the device unreliable for flow control operation during use, both for regulation and flow conditions. As a result, the reliability of the desired stable medical procedure is lost. The problem is that apart from the basic operation of squeezing and adjusting the wall to keep the large diameter pipe as moderate as possible, the very small hydraulic radius creates very small rifts as a result, The point is that such defects are induced.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for regulating and controlling the flow of catheters and other similar devices which overcomes the disadvantages of the prior art. The present invention further provides a method for manufacturing a flow conditioner as described above.

[0004]

According to the present invention, there is provided a flow control device such as a catheter according to the present invention, comprising a single tubular molded piece connected to a fluid supply device, wherein the tubular molded piece is a fluid supply device. Between two pipes of a supply line having a tubular end which can be fitted to the end of the pipe and having therein a circular bore formed by compression molding between said tubular ends, said circular bore being connected to said supply pipe. A uniform cross-sectional passage having a predetermined precision diameter and length communicating therewith is formed, wherein the diameter of the bore is smaller than the inner diameter of the two tubular ends, and the diameter and length are functions of the supplied fluid radius. It is characterized by being calibrated and selected. A method of manufacturing such a flow control device such as a catheter comprises supplying a continuous tubular element, simultaneously introducing a calibrated mandrel into the tubular element in its axial direction, and corresponding to the insertion position of the mandrel. The tubular element is placed in a molding die at a predetermined interval from one end of the element, and the mold is hot-compressed to flatten the tubular element in the mold to correspond to the calibration cross section of the mandrel. Forming a calibration bore, followed by cooling the mold, removing the mandrel, and cutting both ends of the tubular element having the calibration bore formed into a predetermined length, so that the tubular end is formed between the two tubular ends. It is characterized in that a single tubular molded piece having a compression-molded calibration channel is formed.

[0005]

The flow regulating apparatus of the present invention has a fixed bore capable of constantly supplying a highly precisely regulated flow, contrary to the conventional non-adjustable apparatus. By this means, the present invention applies the breakthrough principles in the field of flow control to catheters, ensuring complete adjustment of the bore, and consequently providing permanent control flow suitable for clinical procedures. Furthermore, the use of passages of small diameter but of circular or generally circular cross-section maximizes the cross-sectional area of the passage for a given hydraulic radius, resulting in abnormal operation or blockage as seen in prior art devices. Wipe out very small rifts. The method of making the flow conditioner of the present invention allows the manufacture of tubes having bores that are constant over their entire length and individually have various small dimensions and cross sections. This method can be produced industrially at low cost.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. As is clear from the drawing,
The flow control device such as the catheter of the present invention is a single molded piece 1.
And has tubular ends 2 and 3 and a central portion 4.
The central portion 4 is formed with a hole for forming a flow regulating bore 5 having a high-precision diameter. The holes preferably have a circular or near circular cross-section in order to ensure a maximum transverse dimension with a given hydraulic radius. The central portion 4 of the tube having the bore 5 is flattened to facilitate manufacturing, but may have other shapes as long as the inside of the bore 5 is cylindrical or substantially cylindrical. The method of making the molded piece with the bore forming the fluid passage and the method of forming the passage are shown in FIGS.
In these figures, the plastic tubular element 7 has a calibrated pin or mandrel 8 inside which initially acts as a former and press tools 9 and 10 for hot compression outside the tubular element. Once the temperature of the tubular element 7 has reached the appropriate temperature and its pour point, the press tools 9 and 10 act on the tubular element as shown in FIG. That is, the outside of the tubular element 7 is hot-compressed from both sides and the inside of the tubular element is adapted to the outside shape of the calibrated mandrel 8. Following the operation of externally hot pressing the tubular element 7 on its central area 11 via the mandrel 8 by means of press tools 9 and 10, the tool is removed by a suitable cooling step and the mandrel is removed from the tubular element, The tubular element is brought to a final state for fluid flow regulation. That is, the cross section and the length of the end are made into a simple tubular shape in the initial state. The shape of the central region 11 depends on the shape of the flattening tool as shown in FIG. The interior 12 is adapted to the required shape for the required fluid passage.

FIGS. 7 to 13 schematically show a continuous process for manufacturing a flow control device such as a catheter according to the present invention. As shown in FIG. 7, the initial tubular element 13 is fed axially to a forming press tool, schematically indicated by the reference numeral 14. A guide member 15 carrying a sampling plate collar or external inflatable collar 16 is provided opposite the end of the tubular element 13. The mandrel 17 is inserted into the guide member 15 in the axial direction as shown in FIG. Further, FIG.
Like the mandrel 17, the head 18 has an inflatable collar 16
Is fully inserted into the tubular element 13 until it comes into contact with the flange or head ring 19 adjacent to it. Figures 10 and 11
Shows the forming step of the central region following the step of cutting the tubular element in section 20 from the feed length of the tubular element 13.
FIG. 11 shows a step of removing the mandrel 17 from the guide member 15. In the completed state, the entire adjustment device is
As shown in FIG. 2, it is separated from the mold 14 and finally separated by the movement of the expansion collar 16 as shown in FIG. FIG. 13 shows by reference number 21 the completed flow control device of the invention. The device 21 of the present invention is connected to connecting pieces 22 and 23 as shown in FIGS. For example,
The connecting piece 22 has a frusto-conical inner housing 24 suitable for receiving a supply tube device 26. The connecting piece 23 is shown in FIG.
Needle 2 applicable to the present invention as shown in FIGS.
8 or section 25 to which a catheter can be connected.

The grading of the flow through the regulating device is, on the one hand, governed by the diameter and length of the bore in the molding area of the device 21 and, on the other hand, the level of the injection point 28 for inserting a needle or a catheter into the vessel of the observer. Is controlled by the height of the container 27 containing the fluid to be supplied to the supply pipe 26 with respect to
The liquid column can be changed by changing the height of the container on a conventional support column 29. Modifications or improvements that do not affect the essential requirements of the flow control device, such as a catheter, can be modified within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a longitudinal cross-sectional view of a flow regulating device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an explanatory view showing a first step of a manufacturing process of the flow control device according to the present invention.

FIG. 5 is an explanatory view showing a second step of the manufacturing process of the flow control device according to the present invention.

FIG. 6 is an explanatory view showing a third step of the manufacturing process of the flow control device according to the present invention.

FIG. 7 is an explanatory view showing a position of a calibrated mandrel with respect to a main body in a manufacturing process of the flow control device according to the present invention, and is a view showing a first step.

FIG. 8 is an explanatory view similar to FIG. 7, showing a second step.

FIG. 9 is an explanatory view similar to FIG. 7, showing a third step.

FIG. 10 is an explanatory view similar to FIG. 7, showing a fourth step.

FIG. 11 is an explanatory view similar to FIG. 7, showing a fifth step.

FIG. 12 is an explanatory view similar to FIG. 7, showing a sixth step.

FIG. 13 is an explanatory view similar to FIG. 7, showing a seventh step.

FIG. 14 is an explanatory view showing a state in which the flow regulating device according to the present invention is connected to a connecting piece.

FIG. 15 is an explanatory view showing a state where the flow regulating device according to the present invention is connected to a supply pipe.

FIG. 16 is an explanatory diagram showing a use state of the flow adjustment device of the present invention in a clinical room.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Single molded piece 2, 3 ... End part 4 ... Central part 5 ... Bore 7 ... Tubular element 8 ... Mandrel 9, 10 ... Press tool 11 ... Central area 12 ... Internal 13 ... Tube end part 14 ... Molding die 15 Guide member 16 Inflatable collar 17 Mandrel 22, 23 Connecting piece 26 Supply pipe device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-49863 (JP, A) JP-A-3-237984 (JP, A) JP-A-62-261369 (JP, A) 164637 (JP, U) JP-A 1-1117348 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) A61M 5/14

Claims (2)

(57) [Claims] 1. A single tubular molded piece connected to a fluid supply device, said tubular molded piece having two tubular ends that can be fitted to the ends of the supply line pipes of the fluid supply apparatus. And a circular bore formed therein between the two ends of the tube, the circular bore forming a uniform cross-sectional passage having a predetermined precision diameter and length communicating with the supply pipe, wherein the diameter of the bore is Is a smaller diameter than the inner diameter of the two tubular ends, the diameter and length of which are functions of the radius of the supplied fluid, and are calibrated and selected. 2. A method of manufacturing a flow control device such as a catheter according to claim 1, comprising providing a continuous tubular element and simultaneously introducing a calibrated mandrel into said tubular element in its axial direction. The tubular element is placed in a molding die at a predetermined interval from one end of the tubular element corresponding to the insertion position of the mandrel, and the mold is hot-pressed to remove the tubular element in the mold. Flatten to form a calibration bore corresponding to the calibration cross section of the mandrel, then cool the mold, remove the mandrel, cut both ends of the tubular element with the calibration bore formed to a predetermined length And forming a single tubular molded piece having a calibration flow path compression-molded between the two tubular ends.