JP2023027907A - syringe pump - Google Patents

Abstract

To provide a syringe pump capable of suppressing positional deviation of a barrel.SOLUTION: A syringe pump 100 is applied to a syringe 200 including a barrel 210 formed with an opening at the rear end, which has a barrel flange 213 around the opening, and a plunger rod 220 fitted inside the barrel 210. The syringe pump 100 includes a barrel flange pressing part 130 for holding the barrel flange 213 of the barrel 210 in a thickness direction of the barrel flange 213, and a barrel clamp 122 for holding the barrel 210 by coming into contact with the outer peripheral surface of the barrel 210. The barrel clamp 122 includes a contact face 124 that comes into contact with the barrel flange 213.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to syringe pumps.

Syringe pumps are used to dispense precise amounts of drug solutions from syringes. International Publication No. 2009/113341 (Patent Document 1) describes a syringe pump provided with a clamp for fixing a syringe filled with a chemical solution. The clamp fixes the syringe body in an immovable state. The syringe pump is equipped with a lamp that indicates clamp fixation failure.

WO2009/113341

When a liquid transfer system including a syringe is clogged, the internal pressure of the syringe increases. When the position of the barrel shifts due to an increase in the internal pressure of the syringe, a force may be applied from the plunger rod to the barrel in a direction inclined with respect to the axial direction of the barrel. This force action can further increase barrel misalignment.

The present disclosure proposes a syringe pump capable of suppressing displacement of the barrel.

According to the present disclosure, a syringe pump is proposed for use with a syringe that includes a barrel having an opening formed in its rear end and a flange around the opening, and a plunger rod that fits inside the barrel. The syringe pump includes a clamping portion that clamps the flange of the barrel in the thickness direction of the flange, and a clamping portion that abuts against the outer peripheral surface of the barrel to hold the barrel. The clamp portion has an abutment surface that abuts the flange.

In the above syringe pump, the clamping portion has a pressing surface that contacts the flange and a flange holder that is provided to be relatively movable in the thickness direction with respect to the pressing surface, and the flange is clamped between the pressing surface and the flange holder. However, the contact surface and the pressing surface may be positioned on the same plane.

In the syringe pump described above, the opening may be positioned between the contact surface that contacts the flange and the clamping portion that clamps the flange.

In the syringe pump described above, the clamp portion may have a main body portion and a rib-like projection protruding from the main body portion, and a contact surface may be provided at the tip of the projection.

According to the syringe pump according to the present disclosure, displacement of the barrel can be suppressed.

It is a perspective view which shows the external appearance of the syringe with which the syringe pump of embodiment is mounted|worn. It is a perspective view which shows the structure of the syringe pump of embodiment. It is the figure which looked at the syringe pump of FIG. 2 from the X direction. It is the figure which looked at the syringe pump of FIG. 2 from the Y direction.

Embodiments will be described below with reference to the drawings. In the following description, the same reference numerals are given to the same parts. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1 is a perspective view showing the appearance of a syringe 200 attached to a syringe pump 100 according to an embodiment. As shown in FIG. 1, syringe 200 includes barrel 210 and plunger rod 220 . Barrel 210 is made of a transparent or translucent resin material such as polypropylene. Lubricating oil such as silicone oil may be applied to the inner peripheral surface of barrel 210 .

The barrel 210 has a cylindrical housing portion 211 . The containing portion 211 contains a liquid agent therein. A liquid inlet/outlet 212 is provided at the tip of the barrel 210 . An opening is formed at the rear end of the barrel 210 . A barrel flange 213 is provided at the rear end of barrel 210 around the opening. The barrel flange 213 is formed to protrude radially outward from the rear end of the barrel 210 .

A plunger rod 220 is fitted inside the barrel 210 . A gasket portion (not shown) that contacts the inner peripheral surface of the barrel 210 is provided at the tip of the plunger rod 220 . A flange 221 is provided at the rear end of the plunger rod 220 . The plunger rod 220 has a connecting portion 222 that connects the gasket portion and the flange 221 .

The X, Y and Z directions shown in FIGS. 1 to 4 are directions perpendicular to each other. The Z direction is the axial direction of the cylindrical housing portion 211 and the relative movement direction of the plunger rod 220 with respect to the barrel 210 .

FIG. 2 is a perspective view showing the configuration of the syringe pump 100 of the embodiment. FIG. 3 is a diagram of the syringe pump 100 of FIG. 2 viewed from the X direction. FIG. 4 is a view of the syringe pump 100 of FIG. 2 viewed from the Y direction. 2-4 illustrate syringe pump 100 viewed from different directions.

Syringe pump 100 is a pump applied to syringe 200, as shown in FIGS. When the syringe pump 100 moves the plunger rod 220 into the housing portion 211 , the liquid agent in the housing portion 211 flows out from the liquid agent inlet/outlet port 212 to the outside. The syringe pump 100 mainly includes a body portion 110 , a barrel holding portion 120 , a barrel flange holding portion 130 , a slide shaft 140 , a pushing portion 150 , a grip portion 160 and an operating member 170 .

The body portion 110 is provided with a drive portion and a control portion that controls the drive portion. The driving section includes a motor that drives the slide shaft 140 and a speed reducer connected to the motor.

The barrel holding part 120 holds the barrel 210 of the syringe 200 attached to the syringe pump 100 . The barrel holder 120 has a support 121 and a barrel clamp 122 . The barrel clamp 122 is configured to be movable in the extending direction (Y direction) of the column 121 and to be rotatable around the Y axis. The strut 121 and the barrel clamp 122 may be integrally formed. The barrel clamp 122 may be formed to be movable relative to the strut 121 .

When attaching the syringe 200 to the syringe pump 100, the barrel clamp 122 is lifted upward from the position shown in FIGS. At the position, the barrel clamp 122 is rotated 90° around the Y-axis. In that state, the syringe 200 is placed on the syringe pump 100 . The barrel clamp 122 is then returned to the original position shown in FIGS. In this manner, the barrel holding portion 120 holds the barrel 210 of the syringe 200 .

The barrel flange pressing portion 130 contacts the barrel flange 213 of the syringe 200 attached to the syringe pump 100 . The barrel flange pressing portion 130 has a pressing surface 134 and a flange holder 132 . The flange holder 132 is provided to be movable relative to the pressing surface 134 in the Z direction, which is the thickness direction of the barrel flange 213 . The barrel flange pressing portion 130 may further have a biasing member that biases the flange holder 132 toward the pressing surface 134 .

When the syringe 200 is attached to the syringe pump 100 , the barrel flange 213 provided at the rear end of the barrel 210 is sandwiched between the flange holder 132 and the pressing surface 134 . The barrel flange holding portion 130 corresponds to the holding portion of the embodiment, which holds the barrel flange 213 in the thickness direction of the barrel flange 213 .

Barrel flange 213 has a forwardly facing forward surface 213A. 213 A of front surfaces are surfaces of the surface of the flat barrel flange 213 on the side which faces the accommodating part 211. As shown in FIG. With the barrel flange 213 sandwiched between the flange holder 132 and the pressing surface 134, the lower portion of the front surface 213A faces the pressing surface 134, and the lower portion of the front surface 213A and the pressing surface 134 are in surface contact. ing.

Barrel clamp 122 has a body portion supported by post 121 and abutting barrel 210 . Barrel clamp 122 also has a protrusion 123 . The convex portion 123 has a rib-like shape protruding from the body portion of the barrel clamp 122 . With the syringe 200 attached to the syringe pump 100 and the main body portion of the barrel clamp 122 in contact with the outer peripheral surface of the barrel 210, the contact surface 124 at the tip of the projection 123 is aligned with the front surface 213A of the barrel flange 213. abuts on top.

The convex portion 123 has a curved shape. The protrusion 123 may have a shape extending along the edge of the opening at the rear end of the barrel 210 . Typically, the convex portion 123 may have an arcuate shape. The protrusion 123 may have a shape that extends along the edge of the barrel flange 213 . The convex portion 123 and the contact surface 124 are not limited to the illustrated example, and may have any shape.

The contact surface 124 and the pressing surface 134 are positioned on the same plane extending in the X direction and the Y direction. The contact surface 124 and the pressing surface 134 are positioned on the same plane orthogonal to the thickness direction of the barrel flange 213 . The contact surface 124 and the pressing surface 134 are positioned on the same plane perpendicular to the moving direction of the plunger rod 220 .

An opening at the rear end of the barrel 210 is located between the contact surface 124 that contacts the front surface 213A of the barrel flange 213 and the barrel flange holding portion 130 that holds the barrel flange 213 therebetween. The contact surface 124 contacts the barrel flange 213 above the opening of the barrel 210 . The pressing surface 134 contacts the barrel flange 213 below the opening of the barrel 210 .

The slide shaft 140 has one end connected to the driving portion of the main body portion 110 and the other end connected to the pushing portion 150 . The slide shaft 140 is configured to be slidable in the axial direction (Z direction) of the slide shaft 140 . The pushing portion 150 is connected to the body portion 110 by the slide shaft 140 .

The grip portion 160 has a pressing surface 161 and a movable claw portion 162 that can move relative to the pressing surface 161 in the Z direction. When the syringe 200 is attached to the syringe pump 100 , the grasping portion 160 clamps and fixes the flange 221 of the plunger rod 220 of the syringe 200 in the thickness direction (Z direction) of the flange 221 .

The pushing portion 150 and the gripping portion 160 slide along with the slide shaft 140 in the axial direction (Z direction) of the slide shaft 140 by being driven by the driving portion of the main body portion 110 . The axial direction of slide shaft 140 is along the axial direction of plunger rod 220 . The pressing surface 161 is one surface of the pressing portion 150 facing forward. The pressing surface 161 presses the flange 221 when the pushing portion 150 and the gripping portion 160 move toward the main body portion 110 along the Z direction.

The movable claw portion 162 is connected to the operating member 170 via the pushing portion 150 . The operation member 170 is configured to be rotatable relative to the pressing portion 150 with the Z axis as the center of rotation. When the operating member 170 is arranged at the position shown in FIGS. 2 to 4, the movable claw portion 162 is positioned close to the pressing surface 161 in the Z direction.

When the operating member 170 is rotated counterclockwise around the Z axis from the position shown in FIGS. In this state, the syringe 200 is placed on the syringe pump 100 . At this time, the flange 221 is arranged between the pressing surface 161 and the movable claw portion 162 . After that, by returning the operation member 170 to the original position shown in FIGS. 2 to 4, the movable claw portion 162 moves in the Z direction and approaches the pressing surface 161, and the flange 221 is aligned with the pressing surface 161 and the movable claw portion. 162.

In the syringe pump 100 described above, the barrel clamp 122 has a contact surface 124 that contacts the barrel flange 213, as shown in FIGS. In addition to the conventional configuration in which the barrel flange 213 is clamped by the barrel flange holding portion 130, the barrel clamp 122 for holding the barrel 210 is also provided with a structure for supporting the barrel flange 213, and the barrel flange 213 is clamped at multiple points. It is configured to support This improves retention of barrel 210 as plunger rod 220 moves into barrel 210 . Even if the liquid transfer system is clogged and the internal pressure of the syringe 200 rises, the displacement of the barrel 210 can be suppressed, so that the problem of the barrel 210 floating from the syringe pump 100 can be avoided.

Further, as shown in FIGS. 3 and 4, the contact surface 124 and the pressing surface 134 of the barrel flange pressing portion 130 are positioned on the same plane. Since the load applied to the barrel 210 by the plunger rod 220 when the plunger rod 220 moves into the barrel 210 can be received by both the contact surface 124 and the pressing surface 134, the holding force of the barrel 210 can be reliably improved. positional displacement of the barrel 210 can be suppressed.

Further, as shown in FIGS. 2 to 4, the opening at the rear end of the barrel 210 is positioned between the contact surface 124 that contacts the barrel flange 213 and the barrel flange pressing portion 130 that clamps the barrel flange 213. ing. By adopting a configuration in which the barrel flanges 213 can be supported from both sides of the opening, it is possible to reliably improve the holding force of the barrel 210 and suppress the displacement of the barrel 210 .

Further, as shown in FIGS. 2 to 4, a contact surface 124 is provided at the tip of a rib-shaped projection 123 protruding from the main body portion of the barrel clamp 122 . In this way, the barrel clamp 122 having both the function of contacting the outer peripheral surface of the barrel 210 to hold the barrel 210 and the function of contacting the barrel flange 213 to support the barrel flange 213 can be reliably realized. be able to.

Although the embodiments have been described as above, the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

100 Syringe Pump 110 Main Body 120 Barrel Holding Part 121 Post 122 Barrel Clamp 123 Convex Part 124 Contact Surface 130 Barrel Flange Pressing Part 132 Flange Holder 134 Pressing Surface 140 Slide Shaft 150 Push Part 160 Grasping Part 161 Pressing Surface 162 Movable Claw Part 170 Operation Member 200 Syringe 210 Barrel 211 Storage Part 212 Liquid Inlet/Outlet 213 Barrel Flange 213A Front Surface 220 Plunger Rod 221 Flange 222 Connection Department.

Claims (4)

A syringe pump applied to a syringe including a barrel having an opening formed at its rear end and a flange around the opening, and a plunger rod fitted inside the barrel,
a holding portion that holds the flange of the barrel in the thickness direction of the flange;
a clamp portion that holds the barrel in contact with the outer peripheral surface of the barrel;
The syringe pump, wherein the clamp portion has a contact surface that contacts the flange. The holding portion has a pressing surface that contacts the flange, and a flange holder that is relatively movable in the thickness direction with respect to the pressing surface, and the pressing surface and the flange holder hold the flange. sandwiched,
2. The syringe pump according to claim 1, wherein said contact surface and said pressing surface are positioned on the same plane. 3. The syringe pump according to claim 1, wherein the opening is positioned between the contact surface that contacts the flange and the clamping portion that clamps the flange. The clamping portion has a main body portion and a rib-shaped convex portion projecting from the main body portion,
The syringe pump according to any one of claims 1 to 3, wherein the contact surface is provided at the tip of the projection.

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