JPH0539480Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a sample injection mechanism for injecting a sample using a syringe, and more particularly to a structure of a lid member for closing an injection port.

(Prior art) For clinical analyzers in which a sample such as blood is collected in a syringe and then injected into a sample inlet, a lid member that is constantly pressed by a spring member, a so-called inlet flat, is used. The sample injection port is sealed by a tap.

Therefore, when the inlet flap is released from the lock after the sample is injected, the inlet flap quickly returns to the inlet side using the stored force of the spring and collides with the inlet, causing the inlet flap to return to the inlet side and collide with the inlet. There was a problem with the sample being scattered and contaminating the surrounding area.

(Purpose) The present invention has been made in view of these problems, and its purpose is to provide a sample injection mechanism that can prevent scattering of specimens.

(Summary of the invention) That is, the present invention is characterized in that a damper mechanism is applied to the member that drives the inlet flap.

(Example) The details of the present invention will be explained below based on the illustrated example.

Figures 1 and 2 show an embodiment of the present invention, and the reference numeral 1 in the figure is an inlet flap, which is in a position to close the sample injection port 2 (Figure 1) and in a position to open it. It is rotatably supported by a shaft 3 so as to rotate between positions (FIG. 2), and an arm 5 is rotatably attached to the distal end side via a rotary shaft 4. A piston 6 whose stroke is in the axial direction of the arm is fixed to the other end of the arm 5, and a bottomed cylinder 7 that communicates with the atmosphere through a through hole 7a is hermetically fitted, and is rotatable by a shaft 8. It is attached to a base (not shown). This cylinder 7
A coil spring 9 is interposed between and the arm 5,
During the opening process of the inlet flap 1, the spring 9
is configured to compress. Reference numeral 10 denotes a check valve connected to the bottom of the cylinder 7, which opens the flow path when the pressure inside the cylinder 7 reaches atmospheric pressure or higher. In addition, the reference numeral 11 in the figure is an O inserted around the outer periphery of the piston to maintain airtightness with the cylinder.
Showing the ring.

In this embodiment, when the inlet flap 1 is opened by rotating it around the shaft 3 in order to inject a sample, the piston 6 is pushed by the arm 5 into the through hole 7.
a, and moves toward the bottom of the cylinder 7 while discharging air from the check valve 10. During this process, the coil spring 9 is compressed between the cylinder 7 and the arm 5 and becomes in a stored state, and the inlet flap 1 then stops at a neutral point, that is, in a state in which it is in line with the arm 6 (see Fig. 2). ).

In this way, when the sample injection port 2 is exposed, the sample is injected with the syringe, and after the injection is completed, when the inlet flap 1 is released, the arm 5
The inlet flap 1 is moved in the direction of the sample injection port 2 by receiving the force stored in the spring 9.

This movement generates negative pressure in the cylinder 7, causing the check valve 10 to close the flow path. meet resistance.
Therefore, the inlet flap 1 gradually moves to the sample injection port 2 and comes into gentle contact with it, and from then on,
The force from the spring 5 is applied to press the sample injection port 2 in an airtight manner.

Note that in this embodiment, the spring 5 is provided between the arm 5 and the cylinder 7;
It is clear that the same effect can be achieved even if the material is interposed between the material and the substrate.

(Effects) As explained above, the present invention includes an inlet flap that rotates between a position where the sample injection port is closed and a position where it is opened, and an arm that is attached to the inlet flap. a piston,
An elastic member stores energy in the opening process of the inlet flap, and is provided on the stationary side so as to respond to the rotational movement of the piston. The inlet flap is connected to a check valve that cuts off communication with the atmosphere, and is equipped with a cylinder that has a through hole on the bottom dead center side, allowing the inlet flap to be inserted quickly and reliably without impacting the sample injection port. can be closed.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the device showing one embodiment of the invention in a closed state and an open state, respectively. DESCRIPTION OF SYMBOLS 1... Inlet flap, 2... Sample injection port, 5... Arm, 6... Piston, 7... Cylinder, 7a... Through hole, 9... Spring, 10... Check valve.

Claims (1)

[Scope of utility model registration request] An inlet flap that rotates between a position where the sample injection port is closed and a position where it is opened, a piston that is provided to the inlet flap via an arm, and an inlet flap that is The elastic member is provided on a stationary side so as to respond to the rotational movement of the piston, and communicates with the atmosphere during the energy storage process of the elastic member, and cuts off communication with the atmosphere during the deenergization process. An analysis sample injection mechanism consisting of a cylinder connected to a check valve and having a through hole on the bottom dead center side.