JP2007185825A - Fluid moving needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid moving needle capable of preventing the possibility that a fluid can not be moved because an elastic material of a container enters a communication hole of the needle when the needle is inserted into or pulled out of the elastic material of the container which is sealed by the elastic material or the possibility that the airtightness of the inner section of the container at a time when the needle is pulled out becomes insufficient because a part of the elastic material is peeled off. <P>SOLUTION: This fluid moving needle 10 comprises a hollow pipe section 12 having a hollow space therein, a tip portion 11 having a sharp tip, and the communication hole 7 which is provided to the side face of the hollow pipe section by communicating with the hollow space. Either one of the inner diameter (d<SB>L</SB>) of the communication hole in the longitudinal direction of the needle and the inner diameter (d<SB>W</SB>) of the communication hole in the radial direction of the needle is smaller than the inner diameter (d<SB>N</SB>) of the hollow pipe section. The maximum value of the angle (θ) formed between the cross-section of the inner edge of the communication hole in the longitudinal direction of the needle and the longitudinal direction of the needle is smaller than 90°. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an injection needle for moving a liquid inside a vial, a blood collection needle used for a blood collection container capable of collecting a plurality of blood at the time of blood collection, an ink moving needle used for an exchangeable ink cartridge used for an ink jet printer, and the atmosphere. The present invention relates to a fluid moving needle such as a communication needle.

  Instead of storing fluid (liquid, gas) inside and opening and closing the lid of the moving hole to move the fluid when in use, the moving hole has a partition wall made of an elastic material, and a fluid moving needle is inserted into the partition wall In various fields, fluids can be freely moved, and when the fluid moving needle is withdrawn, the needle hole is closed by the elasticity of the partition wall to maintain the sealed structure. For example, a vial that pierces an injection needle to move the liquid inside, a blood collection container that can collect a plurality of blood samples while the blood collection needle is stuck in a blood vessel at the time of blood collection, an exchangeable ink cartridge that is used in an ink jet printer, etc. . In order for these containers to exhibit their functions to the maximum, the shape and structure of the fluid moving needle used together with the container are important.

  If the moving fluid has a relatively low viscosity or a small moving capacity, a relatively small needle is sufficient. In such a case, a hollow cylindrical tube end as shown in FIG. However, when the viscosity of the fluid is relatively large or the moving capacity is large, the fluid may not move smoothly with a small-diameter needle, so that a relatively large-diameter needle must be used. In this case, if a needle as shown in FIG. 10 is used, a large force is required for insertion because the needle diameter is large, or a part of the elastic body used as a partition in the needle hole (hollow part) at the tip. Clogged in and clogged, making it impossible for the fluid to move, or part of the partition wall to be peeled off, so that when the needle was pulled out, there was a gap in the partition wall that could not maintain sufficient sealing inside the container. . For this reason, a needle having a hole (communication hole) on the side surface (hollow tube portion) of the needle instead of the needle tip is often used. However, even such a structure is not sufficient for solving the above problem, and fluid moving needles having various shapes and structures have been proposed (for example, Patent Documents 1 to 3).

JP-A-63-154356 JP-A-8-252925 JP-A-5-84924

  The needle disclosed in Patent Document 1 is not sufficiently penetrable because the tip of the needle is spherical, and has a large constriction in the hole, so that the strength of the needle is reduced and the needle is easily broken. There was a problem.

  In the needle disclosed in Patent Document 2, the tip of the needle is a conical closed portion, and a hole communicating with the hollow portion of the needle is provided on the slope of the closed portion. However, in this case, since the hole is provided in the inclined surface portion, the elastic body is easy to bite in, or a sufficiently large hole is not provided if the bite is reduced, and the fluid moving capacity cannot be secured. There was a problem that there was a case.

  In Patent Document 3, an ink introduction port which is a needle having a conical point and a hollow tube portion and does not have a notch surface perpendicular to the longitudinal direction of the needle is provided on the side surface of the hollow tube portion. However, this alone is not sufficient for the biting of the elastic body.

  As described above, the prior art cannot sufficiently solve the problem of the present invention, and the present invention cannot move the fluid by the elastic body biting into the communicating hole of the needle when the elastic body is inserted and withdrawn. Or a part of the elastic body is peeled off, so that there is no problem that a gap is formed in the partition wall made of the elastic body when the needle is pulled out and the inside of the container cannot be sufficiently sealed, and the fluid movement capacity is also sufficient. A fluid moving needle that can be secured is provided.

  As a result of intensive studies on the shape and structure of the fluid moving needle, the present inventors can achieve the above object by setting the shape and structure of the fluid moving needle as follows. Invented the invention.

That is, a fluid having a hollow tube portion having a hollow space inside, a pointed portion having a sharp needle-like point, and a communication hole provided on a side surface of the hollow tube portion and communicating with the hollow space In the moving needle, either the inner diameter (d _L ) of the communicating hole in the longitudinal direction of the needle or the inner diameter (d _W ) of the communicating hole in the needle diameter direction of the needle is the inner diameter ( d _N ), and the maximum value of the angle (θ) between the longitudinal section of the needle at the inner edge of the communication hole and the longitudinal direction of the needle is less than 90 °.

A needle diameter (d _S ) of the hollow tube portion including the communication hole is smaller than a needle diameter (d) of other portions.

  A plurality of the communication holes are provided.

  The plurality of communication holes are provided at positions shifted in the longitudinal direction of the needle.

Since either the inner diameter (d _L ) of the communicating hole needle in the longitudinal direction or the inner diameter (d _W ) of the communicating hole needle in the needle diameter direction is smaller than the inner diameter (d _N ) of the hollow tube portion, the elastic body Since the maximum value of the angle (θ) between the longitudinal section of the needle at the inner edge of the communication hole and the longitudinal direction of the needle is less than 90 °, the needle into the elastic body can be reduced During insertion and extraction, the elastic body slides smoothly at the inner edge of the communication hole, and the elastic body is not peeled off.

  Further, by making the needle diameter of the hollow tube portion including the communication hole smaller than the needle diameter of the other portion, the pressing force of the elastic body at the communication hole portion becomes smaller than the other portion, and the amount of biting of the elastic body is reduced. It can be further reduced.

  Furthermore, by providing a plurality of communication holes, the fluid movement capacity can be increased, and by providing the communication holes at positions shifted in the longitudinal direction of the needle, a decrease in the strength of the needle can be minimized.

  As described above, the use of the fluid moving needle of the present invention is various, but it is common that the fluid (liquid, gas) is moved through the elastic body as the partition wall. As an example, the fluid moving needle of the present invention will be described taking an ink supply unit of an ink jet printer as an example.

  FIG. 1 shows a cross section of the main part of an ink supply part of an ink jet printer. A printer main body (not shown) is provided with a holder 2 for mounting the ink cartridge 1, and the holder 2 is inserted into an elastic body 6 for holding the sealed structure of the ink cartridge 1. And an atmospheric communication needle 5. The ink cartridge 1 is mounted on a holder so that these needles (4 and 5) are inserted into the respective elastic bodies 6, and the communication holes 7 of the respective needles (4 and 5) pass over the elastic bodies 6 and ink. When entering the inside of the cartridge 1, the ink 3 communicates with a printer head (not shown) of an ink jet printer (not shown), and the space inside the cartridge communicates with the atmosphere. As a result, the ink 3 and air can be moved through the respective needles (4 and 5). When the ink cartridge 1 is replaced, the ink cartridge 1 is detached from the holder 2. At that time, the needles (4 and 5) are removed from the elastic body 6, and the insertion hole of the elastic body 6 is closed by the elasticity. The cartridge 1 again maintains a sealed structure.

  Hereinafter, the fluid moving needle of the present invention used in the above-described example application will be described with reference to the drawings.

  FIG. 2 shows a fluid moving needle as an example of the first embodiment of the present invention.

The fluid moving needle 10 of this embodiment includes a hollow tube portion 12 having a hollow space therein, a pointed portion 11 having a sharp needle-like pointed end, and a hollow tube portion provided on a side surface of the hollow tube portion. And at least a communication hole 7 communicating with the space of
Either the inner diameter (d _L ) of the communicating hole 7 in the longitudinal direction or the inner diameter (d _W ) of the communicating hole 7 in the needle diameter direction is smaller than the inner diameter (d _N ) of the hollow tube portion. Is preferred. Moreover, it is preferable that the maximum value of the angle (θ) formed between the longitudinal section of the needle at the inner edge 7a of the communication hole 7 and the longitudinal direction of the needle is less than 90 °. The values of the inner diameters d _L and d _W of the communication hole 7 are preferably within this range. If the value falls outside this range, the amount of biting into the communication hole of the elastic body increases, and the needle is inserted into or extracted from the elastic body. This is because part of the elastic body is peeled off. FIG. 11 schematically shows a state where d _L is larger than d _{N and the} amount of biting of the elastic body is large. FIG. 12 schematically shows a state where d _L is smaller than d _{N and the} amount of biting of the elastic body is small. When d _L = d _N , d _W = d _N is the same as that shown in FIG. 11, and the amount of biting into the communication hole of the elastic body becomes large, and a part of the elastic body is peeled off. However, if d _W <d _N , the state is the same as that shown in FIG. 12, and the amount of biting into the communication hole of the elastic body is reduced. It is preferable that the value of θ is within this range. If the value is outside this range, the corner 7b formed by the inner edge portion 7a of the communication hole 7 and the outer peripheral surface of the needle becomes sharp. This is because part of the elastic body is peeled off when inserting or withdrawing. FIG. 13 schematically shows a state where θ is easily peeled off when it is 90 °. If you want to increase the transfer capacity of the fluid transfer needle is a d _W slightly smaller than d _N, it is possible to increase the d _L to match the desired movement capacity.

FIG. 2 shows the case of d _L > d _W , but FIG. 3 shows the case of d _W > d _L. Because if this maximum value of _{d W} when the _d W = _{d N,} when it is desired to increase the transfer capacity of the fluid transfer _needle, as the d W = _{d N,} so as to satisfy the condition of d W> _{d L} the value of d _L may be set. In the case of d _W = d _L, the amount of biting into the communicating hole of the elastic body is also increased, and a part of the elastic body is easily peeled off when the needle is inserted into or extracted from the elastic body.

When d _L = d _W, a circular communication hole is formed. If the condition that either d _L or d _W is smaller than d _N is satisfied, the amount of biting into the communication hole of the elastic body is small in this case as well. When the needle is inserted into or removed from the elastic body, a fluid moving needle is obtained in which a part of the elastic body is not peeled off. From the viewpoint of the moving capacity of the fluid moving needle, the moving capacity is larger. The above d _L > d _W or d _W > d _L is preferable.

  Although the shape of the communication hole has been described as an elliptical shape or a circular shape, it may be a square shape or other shapes. For forming the communication hole, a conventionally known processing method such as a grinder, a metal saw, or a laser is used, but a processing method without burr is preferable.

  FIG. 4 shows a fluid moving needle as an example of the second embodiment of the present invention.

The fluid moving needle of this embodiment is substantially the same as that of the first embodiment, but the needle diameter (d _S ) of the hollow tube portion 12 including the communication hole 7 is the needle diameter (d) of the other part. ) Is preferably smaller. In the fluid moving needle shown in FIG. 4, the outer shape of the hollow tube in the portion where the communication hole 13 is provided is narrowed over the entire circumference compared to the other portions. The value of the aperture amount (d _S / d) is preferably 0.7 ≦ d _S / d <1. When this value is less than 0.7, not only is the effect saturated, but the strength of the needle is reduced. In addition to the method of reducing the needle diameter over the entire circumference, the method of reducing d _S / d is not limited to the method of reducing the needle diameter by reducing the portion where the communication hole is provided as shown in FIG. For example, a method of recessing the opposite side, a method of recessing the side surface of the portion provided with the communication hole as shown in FIG. When d _S / d is reduced in this manner, the amount of the elastic body biting into the communication hole is reduced as schematically shown in FIG. 14, so that when the needle is inserted into or extracted from the elastic body, A fluid moving needle that is not partially stripped is obtained.

  FIG. 7 shows a fluid moving needle as an example of the third embodiment of the present invention.

  The fluid moving needle of this embodiment is provided with a plurality of communication holes of the first embodiment. Providing a plurality of communication holes is preferable because the moving capacity of the needle can be increased. In the case where a plurality of communication holes are provided, it is preferable to provide the communication holes by shifting them in the longitudinal direction of the needle. This is because if the needles are provided on the same circumference without shifting in the longitudinal direction, the strength of the needle may be reduced and the needle may be easily broken. The arrangement of the plurality of communication holes may be provided on the same side as shown in FIG. 7, may be provided on the opposite side as shown in FIG. 8, or the angles are spirally shifted as shown in FIG. 9. You may provide so that.

It is principal part sectional drawing which shows the part by which the ink cartridge is mounted | worn with the holder of the inkjet printer which is an example of use of an example of the needle | hook for fluid movement of this invention. It is the top view and side view which show the needle | hook for fluid movement (horizontal long communication hole) of an example of the 1st embodiment of this invention. It is the top view and side view which show the needle | hook for a fluid movement (vertical long communication hole) of another example of the 1st embodiment of this invention. It is the top view and side view which show the needle | hook for fluid movement (circumferential aperture) of an example of the 2nd embodiment of this invention. It is the top view and side view which show the needle | hook for fluid movement (upper surface aperture | diaphragm) of another example of the 2nd embodiment of this invention. It is the top view and side view which show the needle | hook for fluid movement (side diaphragm | throttle) of another example of the 2nd embodiment of this invention. It is a top view which shows the needle | hook for fluid movement (same side) of an example of the 3rd embodiment of this invention. It is a top view which shows the needle for fluid movement (opposite side) of another example of the 3rd embodiment of this invention. It is a top view which shows the needle | hook (spiral) for fluid movement of another example of the 3rd embodiment of this invention. It is a top view which shows the needle for fluid movements of a prior art example. It is a schematic diagram which shows the biting into the communicating hole of the elastic body when the needle is inserted into or extracted from the elastic body. (When d _L > d _N ) It is a schematic diagram which shows the biting into the communicating hole of the elastic body when the needle is inserted into or extracted from the elastic body. (When d _L <d _N ) It is a schematic diagram which shows the biting into the communicating hole of the elastic body when the needle is inserted into or extracted from the elastic body. (When θ = 90 °) It is a schematic diagram which shows the biting into the communicating hole of the elastic body when the needle is inserted into or extracted from the elastic body. (When d _S / d <1)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink cartridge 2 Holder 3 Ink 4 Ink moving needle 5 Atmospheric communicating needle 6 Elastic body 7 Communication hole 7a Inner edge 7b Corner 10 Fluid moving needle 11 Pointed end 12 Hollow tube

Claims (4)

A hollow tube portion having a hollow space inside,
A tip having a sharp needle-like tip;
In the fluid moving needle having a communication hole provided on a side surface of the hollow tube portion and communicating with the hollow space,
Either the inner diameter (d _L ) of the communicating hole in the longitudinal direction of the needle or the inner diameter (d _W ) of the communicating hole in the needle diameter direction of the needle is larger than the inner diameter (d _N ) of the hollow tube portion. A fluid moving needle characterized by being small and having a maximum value of an angle (θ) between a longitudinal section of the needle at the inner edge of the communication hole and the longitudinal direction of the needle being less than 90 °. The needle for fluid movement according to claim 1, wherein a needle diameter (d _S ) of the hollow tube portion including the communication hole is smaller than a needle diameter (d) of another portion. 2. The fluid moving needle according to claim 1, wherein a plurality of communication holes according to claim 1 are provided. 4. The fluid moving needle according to claim 3, wherein the plurality of communication holes are provided at positions shifted in the longitudinal direction of the needle.

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