JP2014207948A - Method and apparatus of forming concave part of hollow needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a concave part (a dimple or the like) of a prescribed shape in a prescribed position of a surface of a hollow needle with precision and for manufacturing the hollow needle in a short time at a low cost.SOLUTION: In a method of forming a concave part of a hollow needle in which a concave part with dimensions and a shape that are set in advance is formed on an outer surface of a body, a die on which the body is placed, a punch having a tip end corresponding to the dimensions and the shape of the concave part to be formed on the body, and a pressing force imparting means which imparts pressing force to the punch are prepared. The concave part is formed by placing the body on the die to make the punch face the body, by bringing the tip end of the punch into contact with the body while guiding the tip end of the punch in the vicinity of the outer surface of the body, and by imparting the preset pressing force to the punch by the pressing force imparting means.

Description

The present invention relates to a hollow needle concave portion forming method and a concave portion forming device for forming a concave portion such as a dimple in a shape and size set in advance on the outer surface of the hollow needle, and more particularly to the surface of a medical hollow needle such as an injection needle. The present invention relates to a hollow needle concave portion forming method and a concave portion forming apparatus suitable for forming a large number of concave portions.

Since a medical injection needle which is an example of a hollow needle is damaged when pierced, development of an injection needle that is particularly burdensome for the elderly and infants and has little pain is desired.
A thin injection needle may be used to relieve pain when piercing, but commercially available stainless steel injection needles generally have an outer diameter of 0.3 mm or more, and technically the outer diameter is about 0.2 mm. . If the glass is stretched like a micropipette, it is possible to make a needle with an outer diameter of 40 μm, but it is very expensive and insufficient in strength because a skilled worker makes it by hand.

In view of such problems, Patent Literature 1 proposes a silicon hollow needle having an outer diameter of 200 μm or less and sufficient strength. On the other hand, it is known that friction resistance is reduced and slipperiness is improved by performing microdimple processing on a metal surface. Further, Patent Document 1 also suggests that the hollow needle can be easily stabbed by forming a concave portion on the outer peripheral surface by light etching and making the outer peripheral surface of the hollow needle serrated.

However, although the micro dimple processing can be performed by spraying fine particles on the metal surface, dimples having a predetermined shape and a uniform dimension cannot be formed at a predetermined position. There exists a problem that the light etching of patent document 1 is difficult to apply to a metal hollow needle. Further, in laser processing, it is difficult to form dimples having a predetermined shape, which increases the cost.

JP 2002-369816 A (refer to the description of paragraphs 0004 to 0006 and paragraphs 0019 to 0020)

The present invention has been made in view of the above problems, and can form a concave portion (including a dimple-like one) having a predetermined shape accurately at a predetermined position on the surface of the hollow needle, and can achieve a short time and a low cost. An object of the present invention is to provide a method and an apparatus for forming a recess in a hollow needle.

In order to achieve the above object, the hollow needle recess forming method of the present invention is a hollow needle recess forming method in which a recess having a preset size and shape is formed on the outer surface of the main body. And a punch having a tip corresponding to the size and shape of the recess to be formed in the main body, and a pressing force applying means for applying a pressing force to the punch, and placing the main body on a die The punch is opposed to the main body, the tip of the punch is guided near the outer surface of the main body, is brought into contact with the main body, and a pressing force preset by the pressing force applying means is applied to the punch. Thus, the concave portion is formed.

The number of the punches may be one, but a plurality of the punches may be arranged at a preset interval in a direction parallel to the axis of the main body to form the plurality of concave portions simultaneously. .
In addition, the concave portion may be formed in the circumferential direction of the outer surface of the main body by relatively indexing and rotating the punch and the main body in the rotation direction around the axis of the hollow needle.
Furthermore, the punch or the main body may be moved in a direction parallel to the axis of the hollow needle. In this way, when a single punch is used, the concave portions can be formed along the axis at predetermined intervals. When a plurality of punches are used, a larger number of the concave portions can be formed. The recesses can be formed along the axis at predetermined intervals.
In addition, when applying a pressing force and forming a recessed part, you may make it insert a core material in the through-hole of the said main body. By doing in this way, the crushing and a deformation | transformation of the main body in the case of a recessed part formation process can be prevented.

The hollow needle concave portion forming apparatus of the present invention is a concave portion forming device for forming a concave portion having a preset size on the outer surface of the hollow needle main body. The hollow needle concave portion forming device is formed on the die and the main body. A pin-shaped punch having a tip corresponding to the size and shape of the recess, a punch holding portion for holding the punch, a guide for guiding the tip of the punch to the outer surface of the main body, and a pressing force to the punch And a pressing force applying means for applying the pressure. According to this configuration, the hollow needle body is placed and held on the die, the pin-shaped punch is guided to the surface of the body by the guide, and the pressing force is applied, so that the tip shape of the pin is met. A recess is formed on the surface of the body. By passing the core material through the main body in advance, the main body can be prevented from being crushed or deformed even if a pressing force is applied.

Although the number of pins held by the punch holding portion may be one, the efficiency of the recess processing can be improved by holding a plurality of pins at intervals corresponding to the interval between the recesses. In addition, a main body holding portion that holds the main body may be provided, and a rotation drive unit that relatively indexes and rotates the main body together with the main body holding portion around an axis line may be provided. Further, a moving means for moving the main body holding portion and the punch holding portion relative to each other in a direction parallel to the axis of the main body may be provided. By doing in this way, the said recessed part can be formed in the space | interval previously set to the circumferential direction and axial direction of the main body.

Since the present invention is configured as described above, a large number of recesses having a preset shape and size can be easily formed on the surface of the hollow needle at predetermined intervals.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is an example of a hollow needle used for a medical injection needle or the like, in which (a) is a side view for explaining the entire configuration, and (b) is a cross section taken along lines II and II-II of (a). FIG. 4C is an enlarged view showing the size and shape of the recess.
As shown in FIG. 1A, the hollow needle 1 has a hollow needle main body 10 in which a through hole 10 a is formed, and a large number of recesses 11 formed on the surface of the main body 10. The hollow needle 1 may be used for a predetermined application as it is, or may be used as, for example, a medical injection needle through a step of sharpening the tip.

A plurality of recesses 11 are formed in a direction parallel to the axis C of the main body 10 with a preset pitch p. In addition, as shown in FIG. 1B, a plurality of recesses 11 are formed at equal angular intervals α set in advance in the circumferential direction. Further, as shown in the II cross section and the II-II cross section of FIG. 1 (b), the circumferential direction and the axis C direction have an angle α / 2 in the circumferential direction and an interval p / 2 in the axis C direction. The same number of recesses 11 are formed at the same pitch p and the same angular interval α.

As shown in FIG. 1C, the shape of the recess 11 in this embodiment is a part of a sphere having a diameter D, and has a width H (H <D) and a depth S (S <D / 2). 10 surfaces. As an example of the dimensions of the hollow needle 1 to which the present invention can be suitably applied, the outer diameter of the main body 10 is about 0.5 mm to 1.1 mm, the inner diameter of the through hole 10 a is about 0.3 mm to 0.9 mm, and the wall thickness is 0. About 1 mm, a length of about 100 mm, and a recess 11 having a length of about 33 mm. Further, as an example of each dimension of the concave portion formed in the main body 10, the diameter D of the sphere is about 0.2 mm, the concave portion width H is about 0.17 mm, the concave portion depth is about 0.05 mm, and the pitch p is 0 About 6 mm, and a circumferential angle α of about 30 ° to 60 °.

Next, an embodiment of a recess forming apparatus for the hollow needle 1 will be described with reference to FIGS. 2 and 3.
2A is a schematic front view illustrating the configuration of the recess forming apparatus according to an embodiment, FIG. 2B is a schematic side view of the recess forming apparatus in FIG. 2A, and FIG. c) is a schematic side view of another embodiment of the recess forming apparatus provided with the automatic supply device of the main body, and FIG. 3 is a partially enlarged view showing various examples of the tip of the pin.
The recess forming device 2 includes a linear servo motor 21 that moves the slider 21a in the same direction as the axis C, and a servo that is mounted on the slider 21a and that can control the rotation angle of the rotary shaft 22a with high accuracy. A state in which the core member 20 is inserted into the motor 22, the gripping portion 23 that is attached to the tip of the rotating shaft 22 a of the servomotor 22, grips one end of the main body 10 of the hollow shaft 1, and the through hole 10 a of the main body 10. The die 24 on which the main body 10 is placed, the pin 26 which is spaced from the placement surface of the die 24 on which the main body 10 is placed, and the pin 26 is held and moved forward and backward relative to the placement surface. And a flexible holding member 27.

A groove 24 a for receiving the main body 10 and centering and positioning the main body 10 on the mounting surface of the die 24 is formed on the mounting surface of the die 24. The groove 24a may have a cross-sectional shape as long as the cylindrical main body 10 is fitted so that the main body 10 is centered and the main body 10 can be positioned so as not to be displaced in the left-right direction with respect to the axis C. In addition to the partial arc shape shown in the figure, a V-shaped one can be selected. Of course, if the main body 10 can be centered and positioned on the mounting surface of the die 24, a magnet may be used instead of the groove 24a, or the main body 10 may be attracted by air suction. .

As shown in FIG. 2A, the other end of the main body 10 held in the groove 24a of the die 24 is brought into contact with the other end of the main body 10 in the front-rear direction (axis C direction) of the main body 10 in the die 24. A stopper 28 for positioning may be provided. Moreover, you may form the through-hole 28a in the stopper 28 so that the core material 20 which protrudes from the other end of the through-hole 10a can be penetrated. The stopper 28 may be fixedly provided at a predetermined position, but can be moved forward and backward in the direction of the axis C or the direction crossing the axis C by a driving body such as a cylinder or a solenoid. When it is necessary to move the main body 10 in the direction of the axis C during the recess forming process, the main body 10 is retracted to a position that does not interfere with the main body 10 after the positioning so as not to hinder the movement of the main body 10 in the axis C direction. Good.

The holding member 27 holds the pin 26 so that the axis C ′ of the pin 26 intersects the axis C of the main body 10. The material of the pin 26 is preferably selected to be harder than the material of the main body 10. Only the tip portion of the pin 26 may be formed of a hard material. When the material of the main body 10 is stainless steel or titanium, a suitable material for the pin 26 is a cemented carbide or the like, and when only the tip portion is a hard material, it is preferable to use diamond in addition to the cemented carbide.

The tip shape of the pin 26 is matched with the shape of the recess 11 to be formed. When forming the concave portion 11 as shown in FIG. 1C, the shape is adapted to a sphere having a basic diameter D as shown in FIG. In addition, it is also possible to form the front-end | tip of the pin 26 like FIG.3 (b) (c) (d) according to the shape of the recessed part 11 calculated | required. Although the number of pins 26 may be one, it is preferable to hold a plurality of recesses 11 so that the plurality of recesses 11 can be formed in the main body 10 at a time. In this case, as shown in FIG. 4, a plurality of pins 26 are arranged in the same direction as the axis C, and are arranged at the same interval as the pitch p of the recesses 11 in the axis C direction. The pin 26 is preferably held by the holding member in accordance with the number of the concave portions 11 formed in the axis C direction of the main body 10.

The holding member 27 is applied with a pressing force by a pressing force applying means such as a hydraulic cylinder (not shown), and the pressing force applied by the pressing force applying means is evenly transmitted to each of the plurality of pins 26. Like to do. The distal end portion of the pin 26 is guided by a guide 25 disposed in the vicinity of the main body 10 so as to be movable back and forth. When the pressing force is applied to the pin 26 from the direction of the axis C ′ by the pressing force applying means, 26 does not buckle, and the tip of the pin 26 does not come off the surface of the main body 10. The guide 25 and the holding member 27 may be separate members as shown in the figure, or may be integrated.

The core member 20 to be inserted into the main body 10 is for preventing the main body 10 from being crushed or deformed when a pressing force is applied to the main body 10 via the pins 26 by the pressing force applying means. It is preferable to select one having an outer diameter substantially the same as the inner diameter of the through hole 10a of the main body 10. Of course, if the main body 10 is not crushed or deformed even without the core material 20, the core material 20 is not particularly necessary.

FIG. 2C shows another embodiment of the recess forming device 2 provided with the supply device for the main body 10. In this embodiment, a magazine 3 for storing a plurality of main bodies 10 is arranged toward the grooves 24a of the die 24, and the main bodies 10 can be supplied one by one from the magazine 3 toward the grooves 24a. By setting the mounting surface of the die 24 opposite to the magazine 3 to be an inclined surface 24b as shown in the figure, for example, the main body 10 released from the magazine 3 can be dropped into the groove 24a by its own weight. In addition to such an automatic supply device, by providing an automatic carry-out device for the main body 10 such as a robot hand, it becomes possible to automate the formation of the recess 11 in the main body 10.

Next, a procedure for forming the concave portion 11 in the main body 10 of the hollow needle 1 using the concave portion forming apparatus 2 having the above configuration will be described.
First, the main body 10 is set in the groove 24 a of the die 24. At this time, the core member 20 is inserted through the through hole 10a of the main body 10 as necessary. Next, one end of the main body 10 is held by the holding portion 23, and the linear servo motor 21 is driven to position the main body 10 in the axis C direction. This positioning may be performed by bringing the main body 10 into contact with the stopper 28, and after the positioning is completed, the stopper 28 is retracted to a position where it does not interfere with the main body 10.

In the initial state, as shown in FIG. 4A, the holding member 27 is raised, and the tip of the pin 26 is separated from the surface of the main body 10. When the positioning and holding of the main body 10 is completed, the pressing force applying means (not shown) is driven to lower the pin 26 together with the holding member 27. The tip portion of the pin 26 is lowered while being guided by the guide 25, and comes into contact with the surface of the main body 10. If an equal pressing force is applied to each pin 26 through the holding member 27 in this state, the surface of the main body 10 is depressed by the pin 26 as shown in FIG. A concave portion 11 having a shape corresponding to the shape is formed.

Next, the holding member 27 is raised to separate the pin 26 from the surface of the main body 10, and the servo motor 22 is driven to rotate the main body 10 by the angle α, and the operations shown in FIGS. 4 (a) and 4 (b) are performed. repeat. This operation is repeated until the main body 10 rotates once. After the formation of the concave portion 11 for one rotation, the linear servo motor 21 is driven to shift the main body 10 in the direction of the axis C by p / 2 pitch, and the servo motor 22 is further driven to move the main body 10 by α / 2. Rotate to form a recess 11 at that position. Thereafter, the same operation as described above is repeated until the main body 10 makes one rotation. The shift of the p / 2 pitch and the angle α / 2 may be performed alternately. With the above procedure, the hollow needle 1 shown in FIG. 1 is completed.

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this. For example, the number of pins 26 may be one and may be smaller than the number of recesses 11 to be formed. In this case, the linear servo motor 21 may be driven to move the main body 10 by one pitch or a plurality of pitches, and the operation for forming the recesses may be repeated. In the above description, the main body 10 is moved by the linear servo motor 21. However, the holding member 27 and the guide 25 can be moved forward and backward so that the pin 26 is moved with respect to the main body 10. Also good.

The present invention can be widely applied to hollow needles used in medical syringes and the like.

It is an example of the hollow needle used for a medical injection needle | hook etc., (a) is a side view explaining the whole structure, (b) is II sectional view and II-II sectional drawing of (a), (c ) Is an enlarged view showing the size and shape of the recess. 2A is a schematic front view illustrating the configuration of the recess forming apparatus according to an embodiment, FIG. 2B is a schematic side view of the recess forming apparatus in FIG. 2A, and FIG. c) is a schematic side view of another embodiment of the recess forming apparatus provided with the automatic supply device of the main body. It is the elements on larger scale which show the various examples of the front-end | tip part of a pin. It is a partial expanded side view explaining the procedure of recessed part formation.

1 hollow needle 10 body
10a Through hole 11 Concave part 2 Concave forming device 20 Core material 21 Linear servo motor 22 Servo motor 23 Holding part 24 Die 24a Groove 25 Guide 26 Pin 27 Holding member 28 Stopper 3 Magazine

Claims (9)

In the hollow needle recess forming method in which a recess having a preset size and shape is formed on the outer surface of the main body,
Preparing a die for mounting the main body, a punch having a tip corresponding to the size and shape of the recess to be formed in the main body, and a pressing force applying means for applying a pressing force to the punch;
Place the main body on a die and face the punch against the main body,
While guiding the tip of the punch near the outer surface of the main body, the punch is brought into contact with the main body,
Forming the concave portion by applying a pressing force preset by the pressing force applying means to the punch,
A method for forming a hollow needle recess, characterized by comprising: 2. The hollow needle recess formation method according to claim 1, wherein a plurality of the punches are arranged at predetermined intervals in a direction parallel to the axis of the main body, and the plurality of recesses are simultaneously formed. The said recessed part was formed in the circumferential direction of the outer surface of the said main body by relatively indexing and rotating the said punch and the said main body in the rotation direction centering on the axis line of the said main body, or Claim 1 characterized by the above-mentioned. 3. A method for forming a hollow concave portion according to 2. The hollow needle according to any one of claims 1 to 3, wherein the punch or the main body is moved in a direction parallel to the axis of the main body to form a plurality of the concave portions at predetermined intervals. The method of forming a recess. The hollow needle recess forming method according to claim 1, wherein a pressing force is applied by inserting a core material into the through hole of the main body. A hollow needle recess forming apparatus for forming a recess having a preset size and shape on the outer surface of the hollow needle body,
A die for mounting the body;
A pin-shaped punch having a tip corresponding to the size and shape of the recess to be formed in the main body;
A punch holding section for holding the punch;
A guide for guiding the tip of the punch to the outer surface of the main body;
A pressing force applying means for applying a pressing force to the punch;
A hollow needle recess forming device characterized by comprising: The hollow needle recess forming apparatus according to claim 6, wherein the punch holding portion holds the plurality of pins at a predetermined interval. The hollow needle according to claim 6 or 7, further comprising a main body holding portion for holding the main body, and provided with a rotation driving means for relatively indexing and rotating the main body together with the main body holding portion around an axis. Recess forming apparatus. A main body holding part for holding the main body is provided, and a moving means is provided for moving the main body holding part and the punch holding part in a direction parallel to the axis of the main body. The hollow needle recess forming apparatus according to claim 8.

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