JPH06339528A - Injection cylinder clamping apparatus for syringe pump - Google Patents

Abstract

PURPOSE:To obtain an injection cylinder clamping apparatus of a syringe pump which allow operation easily with one hand by pressing a clamp lever onto an injection cylinder on a receiving base by a force of a clamping spring working through a glide frame. CONSTITUTION:Receiving bases 2 are formed at two points longitudinally on the top surface of a syringe pump body 11 and an operation lever 12 is supported with a knob 12a formed at the tip thereof facing the receiving bases 2. A guide frame 15 is provided below the fulcrum of the operation lever 12 free to move vertically and a clamping spring 6 comprising a compression spring is inserted between the glide frame 15 and the syringe pump body 11 and the operation lever 12 and the glide frame 15 are bound with a C-shaped clamp lever 17. A force of the clamping spring 6 pressing down the glide frame 15 works on the operation lever 12 through a pin 18 from the clamp lever 17 to apply a rotary moment to the operation lever 12 with a support shaft 13 as fulcrum thereby causing the clamp lever 17 to press the injection cylinder on the receiving bases 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe pump for pushing a drug solution in a syringe barrel with a piston to infuse the patient, and more particularly to a clamp device for clamping a syringe barrel on a pedestal.

[0002]

2. Description of the Related Art A syringe pump is described in, for example, Japanese Patent Application Laid-Open No. 3-247347, but in this syringe pump, an injection cylinder loaded with a drug solution must be detachably clamped on a cradle. . 5 to 7
Shows a conventional configuration of an injection cylinder clamp device used in the above syringe pump. FIG. 5 is a longitudinal sectional view, FIG. 6 is a perspective view thereof, and FIG. 7 is a rear view of the clamp arm in FIG. In these figures, the syringe barrel 1 is a horizontal cradle 2
It is placed on top and fixed by being pressed against the pedestal 2 by the clamp arm 3. An arcuate surface corresponding to the maximum diameter of the injection cylinder 1 is formed in the portion of the pedestal 2 and the clamp arm 3 that is in contact with the injection cylinder 1 to prevent displacement.

A cylindrical boss 3a at one end of the clamp arm 3 is fitted into a hollow cylindrical support 4 so as to be vertically movable, and an upper end of the clamp boss 3a is fixed to the center of the cylindrical boss 3a. It is pressed against the syringe barrel 1 by a clamp spring 6 which is a compression spring inserted between the syringe barrel 4 and the ceiling. Further, in the clamp arm 3, the protrusion 3b integrally formed inside the cylindrical boss 3a is inserted into the groove 4a on the outer side of the support column 4 to prevent rotation. A magnet piece 7 is embedded in the lower end of the operating rod 5, and three magnetic sensors 8 to 10 are vertically arranged in proximity to the magnet piece 7. With such a configuration, when the injection barrel 1 is attached or detached, the clamp arm 3 is pulled up to form the groove 4 in the ridge 3b as shown by an arrow in FIG.
Extract from a and rotate 90 degrees to the position of the chain line. The rotated clamp arm 3 engages the protrusion 3b with the upper surface of the column 4 and stays in that position.

The syringe barrel 1 has various sizes depending on the internal volume, but in the device shown in the figure, it is 50 ml (milliliter) (1
A), 25 m (1B) and 12 ml (1C) of three types of injection cylinders 1 are clamped. At that time, since the clamp position of the operating rod 5 moves up and down depending on the size of the injection cylinder, the magnet piece 7 faces the magnetic sensors 8 to 10 at each size position, and the ON signal from each sensor 8 to 10 detects this. The size of the syringe barrel 1 currently being clamped is determined. When the injection cylinder 1 is not present, the magnet piece 7 moves further below the magnetic sensor 10, so that the sensors 8 to 1
All of 0s are OFF, and it can be seen that the syringe barrel 1 is not clamped.

[0005]

In the above-mentioned conventional structure, in order to operate the clamp arm, it is necessary to perform two operations of raising the clamp arm once and then rotating it by 90 degrees, which is complicated, and the clamp arm should be pulled up. If so, the syringe pump body will also be lifted, so it was necessary to hold it with the other hand, which was a two-handed work. Further, since the force of the clamp spring is applied to the clamp arm as it is, a large force is required for the lifting operation. Therefore, an object of the present invention is to provide a syringe barrel clamp device for a syringe pump that can be easily operated with one hand.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided an operating lever which is rotatably supported so as to face a cradle of an injection cylinder and has a knob formed at its tip, and is vertically movable below a fulcrum of the operating lever. A slide frame provided on the clamp frame, a clamp spring for urging the slide frame downward, and a clamp lever having both ends connected to the vicinity of the knob of the operation lever and the slide frame. The above object is achieved by pressing the clamp lever against the injection cylinder on the cradle by the force of the clamp spring acting via the sliding frame. Whether or not the syringe barrel is clamped and its type can be detected by attaching a magnet piece to the sliding frame and arranging the magnetic sensor for detecting the magnet piece in line with the position of the sliding frame according to the syringe barrel size. it can.

[0007]

[Operation] To open and close the clamp lever when attaching and detaching the syringe barrel, it is only necessary to pivot the operating lever up and down, and the force of the clamp spring acts as an internal force between the fulcrum of the clamp lever and the sliding frame. Since there is no lifting action, it can be easily operated with one hand. Furthermore,
Since the component force of the clamp spring acting in the operating direction of the operating lever is small, the force required for the turning operation of the operating lever is small.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a perspective view of a clamp device portion of the syringe pump, FIG. 2 is a side view showing a clamp position of the clamp lever in FIG. 1 according to the size of the injection cylinder, and FIG. 3 is a closed position of the clamp lever in FIG. FIG. 4 is a side view showing the open position, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. The same reference numerals are used for the parts corresponding to those of the conventional example. In the figure, a V-shaped pedestal 2 is formed on the upper surface of a syringe pump main body 11 at two positions in front and rear, and an operation lever 12 made of a V-shaped flat plate is rotatably supported so as to face the pedestal 2. ing. A corrugated knob 12a is integrally formed at the tip of the operating lever 12, and the fulcrum at the opposite end is supported by a bearing groove 14 of the main body 11 via a support shaft 13 protruding left and right.

Below the fulcrum of the operating lever 12, the sliding frame 1 is provided.
5 is provided so as to be vertically movable. The sliding frame 15 has a rectangular parallelepiped shape and has an engaging shaft 15a protruding leftward and rightward, and is slidably guided by a guide rod 16 fixed vertically in the syringe pump body 11. A clamp spring 6 made of a compression spring is inserted between the sliding frame 15 and the syringe pump body 11, and the operation lever 12 and the sliding frame 15 are connected by a C-shaped clamp lever 17. Clamp lever 17
Has a U-shaped cross section, one end of which is bifurcated is connected to the vicinity of the knob 12a of the operating lever 12 through a pin 18, and the other end is U-shaped.
It is engaged with the engaging shaft 15a of the sliding frame 15 via the groove 17b. A magnet piece 7 is embedded in the shaft end of one engagement shaft 15a of the sliding frame 15, and three magnetic sensors 8 to 10 are arranged close to the magnet piece 7. The magnetic sensors 8 to 10 are positioned in accordance with the position of the engagement shaft 15a according to the size of the syringe barrel 1, and are supported by a frame base 19 fixed in the syringe pump body 11.

Here, the force of the clamp spring 6 that pushes the sliding frame 15 downward acts on the operation lever 12 from the clamp lever 17 via the pin 18, but this force is applied.
A rotational moment about the support shaft 13 as a fulcrum is applied to. This rotational moment acts counterclockwise while the line of action of the force acting from the pin 18 to the operating lever 12 is on the left side of the support shaft 13 in the figure, and reverses clockwise when shifting to the right side of the figure. Further, the force of the clamp spring 6 acting on the clamp lever 17 from the sliding frame 15 acts so as to always pull down the clamp lever 17.

Under such a structure, in the state shown in FIG. 2, the operation lever 12 tends to tilt counterclockwise, and the clamp lever 17 presses the 50 ml injection cylinder 1A on the pedestal 2. As a result, the injection cylinder 1A is pressed and fixed to the pedestal 2. Syringe size is 50ml (1
When the amount becomes smaller than 25 ml (1B) and 12 ml (1C) from A), the operation lever 12 further turns counterclockwise, and the clamp lever 17 also descends accordingly. The arc arrow in FIG. 2 indicates the locus of the pin 18 at that time. And
The magnet piece 7 moving along the vertical arrow faces the magnetic sensors 8 to 10 at each size position, and the size of the syringe barrel currently being clamped is detected.

The solid line in FIG. 3 shows the closed position of the clamp lever 17, in which position the magnet piece 7 is further below the magnetic sensor 10 and all the magnetic sensors 8-10.
Turns off. From this state, when the operating lever 12 is pivoted clockwise to the chain line position by holding the knob 12a, the clamp lever 17 reaches the chain line position and is completely opened.
At that time, the magnet piece 7 is further above the magnetic sensor 8,
Also at this time, all the magnetic sensors 8 to 10 are turned off.
Further, in this position, as described above, the operation lever 12
A clockwise rotation moment acts on the clamp lever 17, and the clamp lever 17 is held in the open state.

As described above, in the illustrated embodiment, the clamp lever 17 can be easily opened and closed simply by turning the operating lever 12, so that, for example, the syringe barrel 1 can be placed on the pedestal 2 with the left hand and the operating lever with the right hand. One-handed operation such as operating 12 to close the clamp lever 17 is possible. At this time, the upward force exerted on the syringe pump body 11 from the clamp spring 6 is offset by the downward force exerted on the syringe pump body 11 from the operation lever 12 via the support shaft 13 to lift the syringe pump body 11. Does not work for Further, the force of the clamp spring 6 acts vertically downward from the pin 18 on the operating lever 12, but the component of this force in the turning direction of the operating lever 12 is small, and the operating lever 12
The operating force of is small.

[0014]

According to the present invention, since the crank lever can be easily opened and closed by one-handed operation, the syringe barrel can be set with the other hand, and the workability of attaching and detaching the syringe barrel is greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a clamp position of the clamp lever of the device of FIG.

FIG. 3 is a perspective view showing a closed position and an open position of the clamp lever in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a vertical cross-sectional view showing a conventional configuration.

6 is a perspective view of an essential part of FIG.

FIG. 7 is a rear view of the clamp arm in FIG.

[Explanation of symbols]

 1 Injection Cylinder 2 Cradle 6 Clamp Spring 7 Magnet Piece 8-10 Magnetic Sensor 12 Operation Lever 12a Knob 15 Sliding Frame 17 Clamp Lever

Claims (2)

[Claims] 1. A syringe barrel clamp device for a syringe pump, wherein a syringe barrel placed on a cradle is pressed against the cradle to be clamped, which is rotatably supported so as to face the cradle of the syringe barrel.
An operating lever with a knob formed at the tip, a sliding frame that is vertically movable below the fulcrum of the operating lever, a clamp spring that urges the sliding frame downward, and both ends of the operating lever are knobs. And a clamp lever connected to the sliding frame, and the clamp lever is pressed by the force of the clamp spring acting through the sliding frame against the syringe barrel on the cradle. Clamping device for syringe pump. 2. The syringe according to claim 1, wherein a magnet piece is attached to the sliding frame, and a magnetic sensor for detecting the magnet piece is arranged in accordance with the position of the sliding frame according to the size of the injection cylinder. Pump clamp device.