JPS62167569A - Reduced pressure generator and negative pressure generating and holding apparatus of hermetically closed article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reduced pressure generating device, and particularly to a reduced pressure generating device that continuously generates reduced pressure and finally stabilizes in a reduced pressure state, and a device that uses this reduced pressure. It is.

[Conventional technology]

Conventionally, a reduced pressure generator that can operate a pump with a cylinder and a piston with one hand has been known (Utility Model Publication No. 22-304).
Publication No. 5).

[Problem that the invention seeks to solve]

However, although the generation of reduced pressure at the suction port of the known reduced pressure generating device is proportional to the depression of the piston, the pressure suddenly changes to atmospheric pressure at the end of the movement of the piston, which poses a problem depending on the purpose of use.

[Pause) Means to solve point W]

The inventor of the present invention completed the reduced pressure generating device of the present invention by making repeated prototypes of a reduced pressure generating device that quantitatively sucks liquid such as blood using a syringe-type reduced pressure generating device and maintains the reduced pressure even after completion of the suction, and If desired, it can also be used to generate negative pressure inside a small container.

Therefore, the main object of the present invention is to provide a portable reduced pressure generating device that is convenient for quantitatively suctioning liquids such as blood.

Still another object of the present invention is to provide an apparatus capable of generating and maintaining negative pressure within a small container.

To achieve this objective, a reduced pressure generator according to the invention comprises a tube body having a slidable piston connected to a rod extending sealingly through a first end of the tube body; a suction orifice located on or parallel to and adjacent to the axis of the body; means for holding the tube and pushing the piston into the second end of the tube with one hand; and a communication means for communicating a suction orifice with a chamber of a tubular body adjacent to the first end, the suction orifice is connected to an end of a till suction path extending along the surrounding wall of the tubular body. wherein the passageway opens a suction orifice axially adjacent the second end and communicates with the chamber proximate the first end, and communication means further communicates with the passageway longitudinally through the rod from the piston. the latter passage extending from the chamber of the tube adjacent the first end of the tube to the chamber of the tube adjacent the second end when the piston reaches the predetermined position.
terminating in a radial opening arranged to

〔Example〕

The features and advantages of the invention will become more apparent from the following examples, which refer to the accompanying drawings.

The iyi! according to the present invention is suitable for sucking blood, etc.
A specific example of the FE generator will be shown.

According to the syringe 2b shown in FIGS. 1 and 2,
Adjustable sequential negative pressure can be obtained. A conduit 46 extends along the tube 6b and communicates with the chamber 2' by a radial opening 47 adjacent the end 7b, extending below the cap 3b and defining the suction orifice 10.

Syringe 2b in FIG. 1 shows a syringe body 2b consisting of three molded parts assembled by a flat surface cap 3b, an end 7b and a piston-rod arrangement 4. Syringe 2b in FIG.

When the piston is moved from its upper position to a desired position, for example by grasping the ear 8 and the actuation knob 5 with one hand as shown in FIG. transmitted by. For example, the conduit
It can be connected to the inlet 48 of the blood aspiration device shown, which is connected via a conduit 50 with a labyrinth 51 to a hollow needle 49. A graduated tube 52 is connected between the labyrinth 51 and the needle 49. The pressure relief created by the movement of the piston is determined by the position of the piston and determines the desired amount of blood to be drawn into tube 52.

In the case of maximum depressurization, the opening 16 communicates with the chamber 2', so that the piston is under equal pressure from both sides and remains stationary.
Unlike known devices, it does not return to atmospheric pressure suddenly and cause trouble.

If it becomes necessary to release the reduced pressure, it can be easily released by pulling up the operating knob 5 a little. Alternatively, the opening could be located in the rod 14 such that it is always above the end 7b.

Of course, the syringe shown in FIG. 1 can be embodied in a great many applications, and these can be used to quickly and conveniently produce a depressurization using decompression generators that are small and always available, especially in homes and laboratories. You can also use it if you wish. Applications include, for example, cleaning small blocked tubes, priming water pipes, and moving hazardous fluids between two containers. [Effects of the Invention] The reduced pressure generator of the present invention allows continuous Since a reduced pressure is generated during the piston's final stroke and the piston is allowed to stand still as it is, it can be used particularly favorably for quantitative blood sampling. Furthermore, it can be conveniently used as a compact reduced pressure generator.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a specific example of the reduced pressure generating device according to the present invention, FIG. 2 is a sectional view taken along line 2-L in FIG. 1, and FIG. FIG. 2 is a cross-sectional view of a device for sucking blood using the vacuum generating device shown in the figure.

Claims (4)

[Claims] (1) a tube having a slidable piston connected to a rod extending sealingly through a first end of the tube; a suction orifice located proximate; a means for holding the tube and pushing the piston into the second end of the tube with one hand; and a chamber of the tube adjacent the first end when the piston is pushed; communication means for communicating a suction orifice, the suction orifice being configured at the end of a rigid suction passageway extending along the side wall of the tube, said passageway being adjacent to the second end; axially opening a suction orifice and communicating with said chamber proximate a first end, the communication means comprising said passageway and a further passageway extending longitudinally through the rod from the piston, the latter passageway extending longitudinally through the rod from the piston. terminating in a radial opening arranged to communicate from a chamber of the tube adjacent the first end of the tube to a chamber of the tube adjacent the second end when the tube reaches a predetermined position. A reduced pressure generator. (2) The reduced pressure generating device according to claim 1, wherein the pushing means comprises two radial ears near the first end and an actuation knob at the end of the rod. (3) a tube having a slidable piston connected to a rod extending sealingly through a first end of the tube; a suction orifice located proximate; a means for holding the tube and pushing the piston into the second end of the tube with one hand; and a chamber of the tube adjacent the first end when the piston is pushed; communication means for communicating a suction orifice, the suction orifice being configured at the end of a rigid suction passageway extending along the side wall of the tube, said passageway being adjacent to the second end; axially opening a suction orifice and communicating with said chamber proximate a first end, the communication means comprising said passageway and a further passageway extending longitudinally through the rod from the piston, the latter passageway extending longitudinally through the rod from the piston. a reduced pressure generator terminating in a radial opening arranged to communicate from a chamber in the tube adjacent the first end of the tube to a chamber in the tube adjacent the second end when the tube reaches a predetermined position; Negative pressure generation and maintenance device for sealed objects, consisting of a sealed object and a connecting device that connects them. (4) The sealed object is a cylindrical conduit having a passage in the center, one end of which communicates with the hollow needle, the hollow needle is sealed by the aspirate, and a graduated tube passes through the cylindrical conduit between the passage and the hollow needle. The free end of the graduated tube is closed, and the other end of the passageway consists of a fitting part with the tubular connecting device, and the fitting part and the closed end of the tube are configured to be at approximately the same level. 4. The device for generating and maintaining negative pressure in a closed object according to claim 3, wherein the other end of the connecting device is fitted into a suction orifice of the reduced pressure generating device.