JPS6137985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in syringes used for injection, extraction, transportation, etc. of medicinal solutions, body fluids, and the like.

In general, a syringe, or so-called syringe, is
It is composed of a cylinder part that forms a storage chamber for liquid medicine, etc., and has an inhalation/discharge port at its tip, and a piston inserted into this cylinder part for performing inhalation/discharge operations.

Conventionally, the cylinder portion of this type of syringe has been integrally molded from glass or synthetic resin. For this reason, cylinders made of glass have the problem that it is not easy to increase the accuracy of the internal volume, and they are easily damaged, while cylinders made of synthetic resin are easy to increase the accuracy of the internal volume. However, there were also problems with chemical resistance and durability. In addition, when it is made of synthetic resin, there is also the problem that it is difficult to remove dirt from the inside.

In particular, this type of syringe is sometimes used as a pump for transporting and dispensing chemical solutions, sample solutions, etc. in automatic biochemical analyzers and the like. In this case, in order to maintain highly accurate measurement data in analysis and the like, the liquid must be sucked in and discharged with extremely high accuracy. However, in such cases, refrigerated or heated liquids must be frequently inhaled or
Since it is discharged, it repeats thermal contraction and thermal expansion due to temperature changes, so there is a risk that the airtightness will deteriorate due to the temperature change and the accuracy of suction and discharge will decrease. This appears as a direct effect on the measurement data. In addition, in such cases, the cylinder part is fixed and used, but when fixing it, it is often necessary to use adhesives in terms of strength, structure, etc., but this adhesive often peels off due to the aforementioned thermal contraction and thermal expansion. , positional deviation, etc. may occur, resulting in reduced suction/discharge accuracy.

The present invention was made based on such circumstances, and an object of the present invention is to provide a syringe with a cylinder portion that does not suffer from a decrease in accuracy due to temperature changes and is not easily damaged.

That is, the features of the present invention include a cylinder body made of a glass tube, and first and second cylinders each having a predetermined through hole that is disposed at the tip end and the base end of the cylinder body and communicates with the cylinder body.
a cap member, a holder member that presses and holds the cylinder body from both ends via these cap members, and one end of which is inserted into the through hole of the first cap member, and an inlet and discharge passage of the cylinder body. a pipe to be formed, an elastic body inserted between at least the cylinder body and one cap member, and a piston inserted into the cylinder body through a through hole of the second cap member. be.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of the present invention. In the figure, the cylinder body 11 is a cylindrical body made of glass, and is obtained by cutting a glass tube having a predetermined inner diameter into a predetermined length. An annular packing 12 made of, for example, polytetrafluoroethylene is provided at the base end of the cylinder body 11. In addition, the cylinder body 11
A cap 13 is provided at the tip. The cap 13 is made of polytetrafluoroethylene, for example, and has a through hole along the central axis.
A small diameter portion that is fitted into the inside of the cylinder body 11 and a large diameter portion that is sufficiently larger than the small diameter portion are formed on the outer periphery, forming a substantially flange shape. Further, the opening edge of the tip end face (large diameter side end face) of the through hole is chamfered to an appropriate size. An O-ring 14 is provided between the end surface of the cylinder body 11 and the stepped portion of the cap 13. Further, a pipe 15 made of, for example, stainless steel is provided, with one end fitted into the through hole of the cap 13 and the other end protruding toward the tip side. An annular member 16 made of stainless steel or the like and shaped approximately like an abacus bead is fixed to the outer periphery of the intermediate portion of the pipe 15 by silver brazing, laser welding, or the like to form a bulge. These, cylinder body 1
1, Packing 12, Cap 13, O-ring 1
4, the pipe 15 and the annular member 16 are connected to the pipe 1
5 is housed and held in a holder 17 made of stainless steel, for example, with the other end thereof protruding outward. This holder 17 is a first member 17 that holds the proximal end side.
a and a second member 17b that is screwed onto the first member 17a and held on the distal end side. In this case, the first member 17a has a substantially rectangular parallelepiped block shape, and includes the packing 1 on the base end side.
a small diameter part that locks the edge of the cylinder body 11;
A through-hole is provided in which a large-diameter portion that allows insertion of the screw, and a female threaded portion having an inner diameter sufficiently larger than that of the large-diameter portion are formed on the distal end side. Further, an attachment hole 171 is appropriately provided on the side of the through hole of this first member 17a. In this case, the second member 17b has a substantially bottomed cylindrical shape that accommodates the cap 13 and has an inner diameter that allows insertion of the cylinder body 11. A hole 172 for locking the annular member 16 is formed,
The inner (base end) edge of the hole 172 is chamfered to an appropriate size. A male threaded portion is formed around the proximal opening of the second member 17b to be screwed into the female threaded portion of the first member 17a. Further, a see-through portion 173 for seeing through the inside is formed on the intermediate peripheral wall of the second member 17b. This holder 17 accommodates each of the above-mentioned parts inside, and by screwing and tightening the second member 17b to the first member 17a, the first member 1
Small diameter portion in through hole 7a and second member 17b
The respective parts are pressed and clamped in the axial direction between the edge of the hole 172 and the edge of the hole 172. In this way, the cylinder portion S is configured.

With the above configuration, the inside of the cylinder part S has a cap 13 at the tip of the cylinder body 11.
However, the pipes 15 are not only fitted into the through holes of the cap 13 and are almost sealed, but also the tip of the cylinder body 11 - the O-ring 14 - the cap 13
- Annular member 16 - Hole 172 of second member 17b
The edges are pressed together and completely sealed. The space between the base end of the cylinder body 11 and the first member 17a is also sealed by the packing 12. The pressure contact is performed by utilizing the elasticity of the O-ring 14, and can be adjusted by adjusting the screwing state of the holder 17. Moreover, in this case, changes in the internal volume of the cylinder due to thermal expansion and contraction of various parts due to temperature changes can be absorbed by the elasticity of the O-ring 14, and the internal seal is maintained, increasing the accuracy of suction and discharge amounts. Accuracy can be maintained. In addition, since the seal is maintained by pressure bonding without using adhesives or the like to connect each part, there is no reduction in sealing quality due to causes such as peeling of adhesive, and in the event of damage to each component or property deterioration, etc. Only the relevant part can be easily replaced, and maintenance is easy.

In addition, since the cylinder body 11 uses a glass tube with a simple shape, it can be easily and inexpensively manufactured with high precision inner circumferential shape and inner diameter dimensions, and can be used by cutting a commercially available standard glass tube to predetermined dimensions. It is also possible to manufacture it more cheaply and easily.

Further, in the above case, the holder 17 is made of metal in order to obtain high strength and in consideration of manufacturing convenience, but since the see-through window 173 is provided, the inside of the cylinder portion S can be visually observed. Further, in this case, since the holder 17 is directly provided with a mounting hole for mounting and fixing, reliable and stable mounting is possible, and there is no risk of bending stress being applied to the cylinder body 11 during fixation.

Moreover, if the tightening of the holder 17 is adjusted appropriately,
The pressure contact force can be adjusted according to the fluid working pressure range, temperature change range, etc., and the airtightness can be maintained at the best condition.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

For example, in the above embodiment, the cap 13 is made of tetrafluoroethylene resin, etc., and the tip of the cylinder body 11 is sealed with this and the O-ring 14, and the elasticity of the O-ring 14 absorbs volume changes due to temperature. However, as shown in FIG. 3, the cap 13 is made of an elastic material such as fluorine rubber or ethylene rubber, thereby sealing the tip of the cylinder body 11 and absorbing volume changes without using the O-ring 14. You can also
Further, the annular member 16 may be made of the same material as described above or an elastic material such as urethane rubber to obtain the same effect.

In addition, when the O-ring 14 is provided, the O-ring 1
The insertion points of 4 are 14A, 14B, 1 shown in Figure 4.
It may be located at any location of 4C, or may be located at a plurality of locations.

Furthermore, as shown in FIG.
The O-ring 14 may be replaced by laying an elastic sheet 18 on the contact surface of the member 17b against the annular member 16 (coating with an elastic material may be applied).

Further, as shown in FIG. 6, a spherical annular member 19 having a through hole may be used.

As described in detail above, according to the present invention, there is no decrease in accuracy due to temperature changes in the cylinder part, and it is not easily damaged, and when each part deteriorates, the corresponding part can be easily replaced. A syringe can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a vertical sectional view and a perspective view, respectively, showing the configuration of an embodiment of the present invention, and FIGS.
FIG. 6 is a sectional view of a main part for explaining other different embodiments of the present invention. 11... Cylinder body, 12... Packing,
13... Cap, 14... O-ring, 15...
Pipe, 16, 19... Annular member, 17... Holder, 17a... First member, 17b... Second member, 171... Mounting hole, 172... Hole, 173
...Transparent part, 18...Elastic sheet.

Claims (1)

[Claims] 1. A cylinder body made of a glass tube, first and second cap members disposed at the tip and base ends of the cylinder body, respectively, and having predetermined through holes communicating with the cylinder body, and both cap members. a holder member that presses and holds the cylinder body from both ends via a member; a pipe whose one end is inserted into the through hole of the first cap member and forms an intake and discharge passage for the cylinder body;
A syringe comprising at least an elastic body inserted between the cylinder body and one cap member, and a piston inserted into the cylinder body through a through hole of the second cap member.