JPH0434913B2 - - Google Patents

Description

Detailed Description of the Invention A. Object of the Invention (Industrial Field of Application) The present invention relates to a method for bending a medical needle tube and an apparatus for manufacturing the same, particularly a method for bending a needle tube suitable for medical use, pharmaceuticals, 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. 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 has been processed by bending the tip of the needle tube in advance and then 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 disadvantage that it is not possible to form needle tubes with high accuracy 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 were drawbacks such as increased puncturing resistance of the needle tube and the occurrence of so-called coring.

As described above, in the conventional technology, it is not possible to simultaneously bend the tip of the needle tube and bend the needle tube. There is a need for a method for bending medical needle tubes and an apparatus for manufacturing the same, and it is 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 can simultaneously bend the needle tube and bend the tip with extremely good dimensional accuracy. In addition, the present invention provides a manufacturing device 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.

B. 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 involves bending a needle tube with a blade surface formed in advance by bending the blade surface 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 the groove plate is rotated using the bending base as a fulcrum. A method for bending a medical needle tube 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.

According to the medical needle tube bending method in which the predetermined angle is approximately 90 degrees, the rotation of the tip bending jig is controlled by a lever,
This is provided by the medical needle bending method described above, in which rotation and maintenance are performed by an 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. be done.

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 intermediate portion of the bending base is approximately triangular, the bending base is provided with a grooved rod, and the groove plate is a V-groove plate for arranging the needle tubes. Ru.

(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. 1st
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.

A 90-degree bending jig is positioned on the fulcrum base at the bent portion of the needle tube, and it is locked, and a tip bending jig is simultaneously positioned at the tip portion 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 grooved rod 11 as a fulcrum. The rotation angle is 90 degrees, and it is rotated further (approximately 13 degrees). Hold for 4 to 5 seconds considering spring back elasticity.

After that, take out the finished product. 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 Hoover cannula. It is formed as a needle tube 17 that penetrates from the tip blade surface 18 at one end to the other end, and is bent at 90 degrees at about 25 mm, which is half of the total length.

Further, as shown in the figure, the distal end blade surface 18 is bent in the direction in which it is bent at 90 degrees, that is, the distal end is bent so that the blade surface is substantially parallel to the axis of the needle tube on the bent side. This is to prevent coring phenomenon. As a result, there is an effect of eliminating the defects that occur when puncturing a rubber plug or the like. That is, the blade surface cuts off the rubber, thereby preventing rubber debris from entering the needle tube. In this embodiment, the tip blade surface 18 was formed by cutting a blade surface in advance on one end of the needle tube 17 and chamfering both sides of the tip. The shape of the blade surface is not limited to this, and for example, a yaw bevel, a long bevel, a lancet point, or other types of cutting edges 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. The fulcrum base 4 has a rotation shaft hole for a rotary support 22 at both ends, and a V-groove plate holder 2 rotatable in a right angle direction and a handle 3 thereof are attached to the fulcrum base 4.
The V-groove plate 1 is screwed onto the V-groove plate receiver 2 at a slight angle.

The groove of this V-groove plate 1 has one end facing toward the fulcrum base 4 and the other end toward the handle portion 3. That is, many grooves 21 are formed on the upper surface of the V-groove plate 1, for example, 32 grooves are formed parallel to each other at a pitch of 3 mm. The groove 21 was located on the upper surface of the V-groove plate 1, the cross section of the groove was formed at 90 degrees, and the depth was 0.7 mm.

The thickness of the needle tube is 19 to 22 gauge (1.66 in outer diameter)
-0.71 mm), 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 surface matching plate 7 is fitted with the bent plate 6 on the right side in the figure. This blade surface matching plate 7 brings the needle tube into pressure contact with the tip bending base 9 when bending the tip of the needle tube. Further, the bending plate 6 has a rounded outer surface for bending the needle tube by 90 degrees. 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 the tip of the tip blade surface 18 is curved.
Care should be taken in finishing to prevent deformation.

Further, the bent plate 6 is subjected to R (curved surface) processing. This allows the blade surface to be set upward, and the upper side of the blade surface to 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. The thickness, width, etc. of the spacer 8 should be selected depending on the thickness (gauge number) of the needle tube and the shape of the tip of the needle tube (there are various types such as short bevel and long bevel).

The bending base 10 is used as a jig for bending the needle tube. This is placed in the groove 25 of the fulcrum base 4 by the projections 23, 23 at both ends when in use. 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 made thinner. Grooved rod 1 with a round groove 24 at the other end
1 is inserted. The grooved rod 11 has a cylindrical shape and has grooves 26 at equal intervals in the circumferential direction, and the grooves 26 are formed to have the same pitch as the grooves 21 of the V-groove plate 1. This grooved rod 11 is bent and screwed at both ends into the round groove 24 of the base 10. This bending base 1
As shown in FIG. 6, an example of 0 has a triangular cross section 27 formed between the protrusions 23, 23 so that the cross-sectional shape becomes triangular as it faces upward. In this way, the V-groove plate 1 and the grooved rod 1
The needle tube 17 is sandwiched between the grooves 21 and 26 between the grooves 1 and 1. The protrusions 23, 23 are tightened with a clamp (not shown) attached to the fulcrum base 4. As a result, the needle tube is tightened through the groove between the fulcrum base 4 and the grooved rod 11, thereby preventing rotation of the needle tube when bending the needle tube. When bending the needle tube, the V-groove plate 1 is rotated approximately 90 degrees counterclockwise about the rotation support 22 and stopped by a 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 moving the lever 14 clockwise, the arm 13 and the fulcrum 12
The tip bending base 9 is then rotated in the same direction. 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.

Regarding the operation of the V-groove plate 1, when the handle part 3 is lifted up using the rotation support 22 as the rotation axis, the spacer 32
The V-groove plate 1 also rotates about the rotation support 22 via the rotation support 22 . It can be rotated counterclockwise on the drawing, giving a rotation angle of approximately 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 bent using the groove 26 on the outer peripheral surface of the grooved rod 11 as a radius of curvature. When the handle part 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 groove 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. Then bend the needle tube 30. In addition, the tip blade surface 1 whose tip is bent in advance
8 is maintained in the space within this device in order not to damage the tip 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 groove 26 of the grooved rod 11. This is because the projections 23, 23 at both ends of the bending base 10 mentioned above are pressed down in the direction of the fulcrum base 4 by the clamps. For this purpose, the needle tube 17 is inserted from the groove 21 of the V-groove plate 1 toward the fulcrum base 4 and then held down. After the needle tube 17 is bent, the clamp is released and the bending base 10 is removed to complete lifting it from above the V-groove plate 1.

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 problem can be solved by setting the bending angle to a value that slightly exceeds the final finished angle, depending on the material, needle gauge number, required bending angle, etc. For example, in the case of a 19 gauge, it is appropriate to adjust the stopper 31 so that the rotation angle of the V-groove plate 1 is approximately 90 degrees plus 13 degrees.

Further, by selecting the interval 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 arranged in the upper V-groove 21 of the V-groove plate 1 of the manufacturing device, which is set according to the type and size of the blade surface.

The tip bending jig consists of a blade matching plate 7, a spacer 8,
Includes the tip bent base 9, etc. The needle tube is set by pushing it toward the tip bending base 9 with the blade surface facing upward.

90 on the top of the fulcrum base 4 near the center of the cannula.
The bending base 10 of the bending jig is placed on the cannula 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 kept in an upward position and the handle part 3 was lifted, and the V-groove plate 1 was rotated counterclockwise and bent by 90 degrees using the grooved rod 11 as a fulcrum.

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

The protrusion 23 was unlocked, the 90 degree bending jig was released, and the bending base 10 was removed.

The cannula with its tip bent was removed and the finished product was taken out.

C. Effects of the Invention In the medical needle tube bending method and its manufacturing device of the present invention, the blade surface is formed in advance before bending the needle tube, and the blade surface is more constant than the blade surface formed after bending. . In addition, it has extremely good dimensional accuracy and can simultaneously bend the needle tube and bend the tip. 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.

Further, the manufacturing device has a simple structure and does not require adjustment or replacement of parts except for changing the gauge and bending position of the needle tube. By using the bending base and the tip bending base as fulcrums for both bending, it is possible to achieve high precision, mass production, and low cost as a device that can perform needle tube bending and tip bending at the same time.

[Brief explanation of drawings]

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... Handle part, 4... Fulcrum base, 5... Liner, 6... Bending plate, 7... Blade surface matching plate, 9... Tip bending base, 10... Bending Base, 11... Grooved rod, 14... Lever, 1
7... Needle tube, 18... Tip blade surface, 21, 25, 2
6...Groove, 22, 28...Rotation support, 23...Protrusion, 24...Round groove.

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, sandwich the needle tube between the bearing pedestal and the bending base, and attach the tip bending jig. A method for bending a medical needle tube, characterized in that the needle tube is bent at a predetermined angle by rotating around a rotational support, bending and maintaining the tip end, and rotating the groove plate using a bending base as a fulcrum. 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. A needle tube bending device for bending needle tubes at a predetermined angle, comprising: a groove plate for arranging the needle tubes, a bearing pedestal for rotatably supporting a groove plate for arranging the needle tubes, and a jig for bending the tips of the needle tubes at a distance from each other; a bending base placed on a pedestal; a tip bending base that pinches the vicinity of the tip of the needle tube and rotates around a rotational support to bend the tip; the needle tube is held between the bending base and the pedestal;
A medical needle tube manufacturing device comprising: a rotation mechanism for rotating the groove plate by a predetermined angle about a rotation 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.