JPH03277373A - Bending method for medical needle tube and its manufacturing device - Google Patents

Abstract

PURPOSE:To obtain a constant needle tube with high accuracy by inserting the needle tube with two blade surfaces from a groove plate side to a tip bending base side setting the blade surfaces upward, sandwiching it between a bearing pedestal and a bending base, maintaining it as bending the tip of a tip bending tool by rotating setting a rotary shaft as an axis, and forming the curvature of the needle tube at a prescribed angle by rotating a groove plate setting the bending base as fulcrum. CONSTITUTION:The needle tube 17 on which the blade surface is formed in advance is inserted from the groove plate 1 side to the tip bending base 9 side setting the blade surface upward, and is sandwiched between the bearing pedestal and the bending base 9, and a lever 14 is raised, and the tip is bent by rotating in a clockwise direction setting the rotary shaft 28 as the axis. Next, a knob part 3 is raised in a state where the lever 14 is raised, and the V-shape groove plate 1 is rotated setting a bar 11 with groove as the fulcrum in a counterclockwise direction until it is abutted with a stopper 31. Such angle of rotation is set at 90 deg., and furthermore, it is rotated by around 13 deg.. Bending working accuracy with high reliability can be obtained by holding spring back elasticity for 4-5 seconds.

Description

Detailed Description of the Invention A. Purpose of the Invention (Field of Industrial Application) The present invention relates to a method for bending a medical needle tube and an apparatus for manufacturing the same, in particular,
The present invention relates to a method for bending a needle tube suitable for medical use, pharmaceutical products, etc., and an apparatus for manufacturing the same.

(Prior Art) Conventionally, a needle tube shown in FIG. 7 has been desired for medical use, pharmaceutical use, etc. In order to manufacture this, it is necessary to bend both the middle part of the needle tube and the tip part.In contrast, conventionally, the tip of the needle tube is bent in advance for the cutting surface at the tip of the needle tube. The tip of the needle tube was then processed by grinding the blade surface. Furthermore, a jig was used to perform a bending process near the center of the needle tube.

However, this method has the drawback that it is not possible to form needle tubes with high precision and uniformity in large quantities, and it is difficult to obtain a uniform blade surface formation at the tip of the needle tube.

As a result, there have been disadvantages such as increased puncture resistance of the needle tube and generation of so-called coring.

As described above, in the conventional technology, it is not possible to bend both the tip of the needle tube and the bending of the needle tube at the same time. There was a need for a method for bending medical needle tubes and an apparatus for manufacturing the same, and it was also necessary to improve the accuracy thereof.

(Problems to be Solved by the Invention) Therefore, the method of bending a medical needle tube and the manufacturing device thereof according to the present invention solves the conventional drawbacks, and also enables bending of the needle tube and tip at the same time with extremely good dimensional accuracy. The present invention also provides manufacturing equipment for the same. As a result, the purpose is to facilitate processing and ensure stable and reliable bending accuracy. Furthermore, the aim is to easily provide a low-cost needle tube by achieving a simple and quick process.

1. Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the medical needle tube bending method of the present invention includes bending a needle tube with a blade surface formed in advance from the groove plate side to the tip bending base side. The needle tube is inserted with the needle facing upward, the needle tube is held between the bearing pedestal and the bending base, the tip bending jig is rotated around the rotation support to keep the tip bent and maintained, and the groove plate is rotated using the bending base as a fulcrum. A medical needle tube bending method is provided, which is characterized in that the needle tube is bent at a predetermined angle.

Further, in order to effectively achieve the above object, it is preferable to have the following features.

The present invention is provided by the medical needle tube bending method in which the predetermined angle is approximately 90 degrees, and by the medical needle tube bending method in which the rotation of the tip bending jig is rotated and maintained by a lever arm.

Further, as a manufacturing device for implementing the medical needle tube bending method of the present invention, a needle tube bending device that bends needle tubes at a predetermined angle includes a groove plate for arranging the needle tubes and a jig for bending the tips of the needle tubes. A bearing pedestal that is spaced apart and rotatably supported; a bending base that is placed on the pedestal as a fulcrum for the bent portion of the needle tube; and a bending base that holds the vicinity of the tip of the needle tube and rotates around the rotational support to bend the tip. Provided by a medical needle tube manufacturing device, comprising: a base; and a rotation mechanism that holds a needle tube between the bending base and the pedestal and rotates the groove plate by a predetermined angle about a rotational support. .

Further, in order to effectively achieve the above object, it is preferable to have the following features.

The needle tube manufacturing apparatus is provided when the cross section of the middle portion of the bending base is approximately triangular, when the bending base is provided with a grooved rod, and when the groove plate for arranging the needle tubes is a groove plate. .

(Operation) The medical needle tube bending method configured as described above operates as follows.

First, a blade surface is separately formed on the needle tube in advance, and then the medical needle tube bending method of the present invention is performed. First, the tip of the needle tube is bent on the blade side, and while this is maintained, the needle tube is bent approximately at the center of the needle tube.

Place the 90 degree bending jig on the fulcrum base at the bent part of the needle tube! and lock it, and simultaneously position the tip bending jig at the tip of the needle tube.

Furthermore, the tip bending jig is operated by raising the lever 14 and rotating clockwise about the rotation support 28 to bend the tip.

Next, the medical needle tube bending method is performed while maintaining the lever 14 in an upward position. This lifts the handle part 3 and rotates the V-groove plate 1 counterclockwise until it hits the stopper 31 using the cleaning rod 11 as a fulcrum. The rotation angle is set to 90 degrees, and the rotation angle is further increased by more than 90 degrees (approximately 13 degrees). Hold for 4 to 5 seconds to allow for spring back elasticity.

After that, the finished product is taken out. To do this, lower the lever 14 of the tip bending jig, lower the 90-degree bending handle 3, unlock the protrusion 23, and remove the 90-degree bending jig. Remove the medical needle tube and complete.

(Example) To explain an example, a manufacturing apparatus for implementing the medical needle tube bending method of the present invention will be specifically described with reference to the drawings.

FIG. 7 shows the external shape of the needle tube obtained by the method of the present invention. This needle tube is generally called a two-bar camera. It is formed as a needle tube 17 that penetrates from the tip blade surface 18 at one end to the other end, and at about 25 mm, which is half of the total length, 90
It is bent to the degree.

In addition, as shown in the figure, the tip of the tip blade surface 18 is bent in the direction in which it is bent at 90 degrees, that is, the tip is bent so that the blade surface is approximately parallel to the axis of the needle tube on the bent side. This is to prevent the ring phenomenon. As a result, it has the effect of eliminating the defects that occur when puncturing rubber plugs, etc. 6
In other words, it is possible to cut the rubber with the blade surface and prevent rubber debris from entering the needle tube.In this embodiment, the tip blade surface 18 is formed by cutting a blade surface in advance at one end of the needle tube 17, and chamfering is done on both sides of the tip. I used something. The shape of the blade surface is not limited to this, and for example, an iodine bevel, a long bevel, a lancet point, or any other cutting edge may be formed.

Next, a manufacturing apparatus for implementing the medical needle tube bending method of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of the main parts of a manufacturing apparatus for carrying out the needle tube bending method, and FIG. 2 is a perspective view of the main parts of the manufacturing apparatus shown in FIG.

A rectangular parallelepiped liner 5 is screwed near the center of a rectangular floor plate 16 on which the entire device is placed, and a fulcrum base 4 is placed parallel to the liner 5 by rotating pivots 22 at both ends of the fulcrum base 4. There is a shaft hole, and to this fulcrum base 4, a groove plate support 2, which is rotatable in the right angle direction, and a handle portion 3 thereof are attached.

This ■groove plate receiver 2 is made to have a slight angle, and ■the groove plate 1 is screwed.

The groove of this V-groove plate l has one end as the fulcrum base 41j! ! I, and the other end is in the direction of the handle part 3. In other words, many grooves 21 are formed on the upper surface of the groove plate 1, for example, 32 grooves 21 are formed parallel to each other as V-shaped grooves at a pitch of 3IIm. Wei 21 is ■
It was located on the upper surface of the groove plate 1, and the cross section of the edge was formed at 90 degrees, and its depth was 0.7 mm.

The thickness of the needle tube is 19 to 22 gauge (1.66 in outer diameter)
~0.71 am>, but the pitch and depth of the grooves 21 should be adjusted as appropriate depending on the size of the needle tube.

Next, the blade matching plate 7 is fitted with the bending plate 6 on the right side of the figure, and this blade matching plate 7 has a zero length that presses the needle tube against the tip bending base 9 when bending the tip of the needle tube. The bending plate 6 has a rounded outer surface for 90 degree bending of the needle tube. This is because, when the bending plate 6 rotates, it does not come into contact with the opposite surface of the bending base 10 that is in contact with the needle tube.

The outer surface of the bending plate 6 has a curved surface at the lower part so that it can easily come into contact with the needle tube, and care should be taken in finishing to prevent the tip of the distal blade surface 18 from curling up or deforming.

Further, the bent plate 6 is subjected to R (curved surface) processing. As a result, the blade surface can be set upward, and the upper side of the blade surface can be brought into contact with the bending plate 6.

The spacer 8 is a plate material that is in contact with the lower surface of the blade surface matching plate 7. This spacer 8 is the thickness of the needle tube (gauge number)
The plate thickness, width, etc. should be selected depending on the shape of the tip of the needle tube (there are types such as short bevel and long bevel).

The bending base 10 is used as a jig for bending the needle tube. When in use, this is placed on the arm 25 of the fulcrum base 4 by the projections 23 and 23 at both ends. Further, the cross section of the central portion of the bending base 10 has a slightly triangular cross-sectional shape in the vertical direction, and the upper end portion of the bending base 10 is tapered. A grooved rod 11 having a round groove 24 is fitted into the other end. The grooved rod 11 has a cylindrical shape and has ridges 26 equally spaced in the circumferential direction, and is formed to be equal to the interval (pitch) between the grooves of the ridges 21 of the grooved plate 1.

This rod 11 with arms is bent and tightened at both ends into the round groove 24 of the base 10 with screws. As shown in FIG. 6, an example of this bent base 10 has a triangular cross section 27 formed between the protrusions 23 and 23 so that the cross section becomes triangular upward. . In this way, (1) the protrusions 23 and 23, which sandwich the needle tube 17 between the arms 21 and 26 between the grooved plate 1 and the grooved rod 11, are tightened with a clamp (not shown) attached to the fulcrum base 4; As a result, the needle tube is tightened via the edge between the fulcrum base 4 and the clearing rod 11, thereby preventing rotation of the needle tube when bending the needle tube. (2) When bending the needle tube, the groove plate 1 is rotated a little more than 90 degrees counterclockwise about the rotation support 22 and stopped by the stopper 31.

Next, FIG. 5 is an explanatory view of the main part of the tip bending portion of the needle tube, and the function of bending the tip of the needle tube will be explained using this figure. The aforementioned tip bending base 9 rotates clockwise around its rotational support 28. At this time, the tip end portion of the needle tube 17, which is sandwiched between the tip bending base 9 and the spacer 8, is bent by this rotation. This rotation of the tip bending base 9 is achieved by lifting the lever 14 upward using the lever pedestal 15 as a fulcrum, as shown in FIG. That is, by lifting the lever 14 clockwise, the tip bending base 9 is rotated in the same direction via the arm 13 and the fulcrum 12. At this time, the lever 14 is temporarily held substantially perpendicular to the floorboard 16.

FIG. 4 is an explanatory view of the main part of the bent portion of the needle tube.

(2) Regarding the operation of the grooved plate 1, when the handle portion 3 is lifted using the rotational support 22 as an axis, (2) The grooved plate 1 also rotates about the rotational support 22 via the spacer 32. It can be rotated counterclockwise in the drawing to obtain a rotation angle of about 90 degrees. FIG. 4 shows a state in which the V-groove plate 1 and the needle tube 17 have been rotated to the positions indicated by dotted lines. At this time, the needle tube 17 is connected to the edge 26 on the outer peripheral surface of the cleaning rod 11.
is bent as the radius of curvature. When the handle portion 3 is further lifted, it collides with a stopper 31 and stops bending. Here, in order to achieve the desired finishing angle, the stopper 31 is provided with a rotation angle fine adjustment function.

This allows the angle of bending of the needle tube 17 to be freely selected.

Therefore, the needle tube 17 is bent along the edge 21 on the V-groove plate 1 using the grooved rod 11 as a fulcrum.

At this time, the intermediate portion 19 of the needle tube 17 is sandwiched between the grooved rod 11 and the fulcrum base 4, and is held between the bent tip base 9 and the spacer 8, as shown in FIG. The needle tube 30 is bent at this step, and the distal end blade surface 18 whose distal end has been bent in advance is maintained in the space within this device, in order not to damage the distal end of the blade surface, etc. Here, the vicinity of the intermediate portion 19 of the needle tube 17, which is the bent portion, is firmly pressed down by the arm 26 of the grooved rod 11.

This corresponds to the projections 23 and 23 at both ends of the bending base 10 mentioned above.
This is because it is pressed down in the direction of the fulcrum base 4 by the clamp. For this purpose, insert the needle tube 17 into the fi of the V-groove plate 1.
After the six-needle tube 17, which is pressed after being inserted in the direction of the fulcrum base 4 through the 21, is bent, the clamp is released, the bending base 10 is removed, and the lifting from above the groove plate 1 is completed.

Next, processing that takes into consideration the bending elasticity of the needle tube 17 will be described. This is a so-called springback phenomenon after the needle tube 17 is bent. This can be solved by setting the bending angle to a value that slightly exceeds the final finished angle depending on the material, needle tube gauge number, required bending angle, etc. 9 For example, for a 19 gauge, it is about 90 degrees plus 13 degrees V? It is appropriate to adjust the stopper 31 so that the rotation angle of the plate 1 is 1g.

Further, by selecting the spacing between the rotational support 22 and the rotational support 28, the distance between the tip bending position and the 90 degree bending can be arbitrarily realized.

FIG. 3 is a schematic diagram of the operation of the needle tube bending manufacturing apparatus shown in FIG. 1. Next, a method for bending a needle tube will be explained using FIGS. 3 to 5.

First, the blade surface of the needle tube (camera) is formed in advance.

Thirty-two needle tubes are lined up in the V-groove 21 on the upper surface of the groove plate 1 of the manufacturing device, which is set according to the type tag and size of the blade surface.

The tip bending jig includes a blade surface matching plate 7, a spacer 8, a tip bending base 9, etc., and the needle tube is set by pushing in the direction of the tip bending base 9 with the blade surface facing upward.

A bending base 10 of a 90-degree bending jig is placed on the camera on the upper surface of the fulcrum base 4 near the center of the camera, and is locked to the fulcrum base 4 by its projections 23,23.

In order to raise the tip bending jig, lift the lever 14 upward and rotate it clockwise around the rotation support 28 to bend the tip.

The lever 14 was maintained in an upward position and the handle portion 3 was lifted, and (1) the grooved plate 1 was rotated counterclockwise and bent by 90 degrees using the bar 11 as a fulcrum.

Lower the lever 14 of the tip bending jig and lower the handle 3 for 90 degree bending.

Unlock the protrusion 23, release the 90 degree bending jig, and remove the bending base 10.

I removed the camera with the tip bent and took out the finished product.

Effects of the Halo Invention In the medical needle tube bending method and its manufacturing apparatus according to the present invention, a blade surface is formed in advance before bending the needle tube,
Compared to the blade surface formed after bending, the blade surface becomes more constant6.
It has extremely good dimensional accuracy and allows for needle tube bending and tip bending at the same time. As a result, processing is facilitated, and moreover, stable and reliable bending accuracy can be ensured. Furthermore, by achieving a simple and quick process, it is possible to easily provide a low-cost needle tube.

In addition, the manufacturing device has a simple structure and does not require adjustment or replacement of parts other than changing the gauge and bending position of the needle tube.By using the 6-bending base and the tip bending base as the fulcrum for both bending, the needle tube can be easily adjusted. As a device that can perform bending and tip bending at the same time, high precision, mass production, and low cost can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the main parts of a manufacturing apparatus for carrying out the medical needle bending method of the present invention, FIG. 2 is a perspective view of the main parts of the manufacturing apparatus of FIG. 1, and FIG. 3 is a schematic diagram of the manufacturing apparatus of FIG. Fig. 4 is an explanatory diagram of the main parts of the needle tube bending part, Fig. 5 is an explanatory diagram of the main parts of the tip bending part, Fig. 6 is a perspective view of the bending base, and Fig. 7 is a method of the present invention. The external shape of the needle tube obtained in is shown. 1: V groove plate 1.3:1! Hand part, 4: Fulcrum base 5: Liner, 6: Bending plate, 7: Blade surface matching plate 9: Tip bending base, 10: Bending base 11: Rod with arm, 14 Nilever, 1
7: Needle tube 18: Tip blade surface, 21.25.26: Wei 22.
28: Rotation support, 23/Protrusion 24: Round groove) Fig.

Claims (1)

[Scope of Claims] 1. Insert a needle tube with a blade surface formed in advance from the groove plate side to the tip bending base side with the blade surface facing upward, and clamp the needle tube between the bearing pedestal and the bending base, and use the tip bending jig. A method for bending a medical needle tube, characterized in that the needle tube is rotated around a rotational support to bend and maintain the tip thereof, and the groove plate is rotated using a bending base as a fulcrum to bend the needle tube at a predetermined angle. 2. The medical needle tube bending method according to claim 1, wherein the predetermined angle is approximately 90 degrees. 3. The medical needle tube bending method according to claim 1 or 2, wherein the rotation of the tip bending jig is rotated and maintained by a lever or an arm. 4. In a needle tube bending device that bends needle tubes at a predetermined angle, a groove plate for arranging the needle tubes, a bearing pedestal for separating and rotatably supporting a jig for bending the tip of the needle tube, and as a fulcrum for the needle tube bending part, a bending base placed on the pedestal; a tip bending base that holds the vicinity of the needle tube's tip and rotates around a rotational support to bend the tip; the needle tube is held between the bending base and the pedestal; 1. A medical needle tube manufacturing device comprising: a rotation mechanism that rotates a grooved plate by a predetermined angle about a rotational support. 5. The medical needle tube manufacturing device according to claim 4, wherein the cross section of the intermediate portion of the bending base is approximately triangular in cross section. 6. The medical needle tube manufacturing device according to claim 4 or 5, wherein the bending base has a grooved rod added thereto. 7. The medical needle tube manufacturing device according to claim 5 or 6, wherein the groove plate for arranging the needle tubes is a V-groove plate.