JPH0647091A - Syringe injection pump - Google Patents

Abstract

PURPOSE:To obviate the infiltration of liquid and foreign matter, etc., into a slider guide part and to assure the stable movement of a slider which is engageably and disengageably connected with a presser inserted into a syringe and moves rectilinearly by constituting the slider in such a manner that the slider is guided and held in the axial direction of the syringe by a guide means. CONSTITUTION:A detaining part 65 which detains the flange at the end of the presser 55 inserted into a cylinder 58 clamped and held via a clamper 56 to a pair of V-groove holding parts 54 is formed at the end of the slider 64. The detained presser 55 is actuated by the continuous rectilnear motion of the slider 64 by a small-sized electric motor 44, by which the medicinal liquid within the cylinder 58 is smoothly injected into the patient's body. A guide rod 62 forms a U-shaped section opened at the base and is provided with a guide groove 67 formed of a groove into which the outer periphery of a cam follower 68 can be inserted. The cam follower 68 guided by a guide groove 67 is completely housed into the guide rod 62 and therefore the infiltration of the liquid and foreign matter from the outside does not arise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safe and easy-to-handle syringe injection pump capable of stepwise injecting a liquid medicine or the like in an arbitrary setting pattern, and particularly to one end of a pusher inserted into the syringe. The present invention relates to an improvement of a guide means of a slider that locks and guides it so that it can move forward and backward.

[0002]

2. Description of the Related Art Generally, a syringe injection pump, as shown in FIGS. 4 to 5, has a recess 14 for supporting a syringe (not shown) on a base 10 and a syringe supported by the recess 14 elastically pressed from above. Holding part 18 composed of a clamper 16 and a screw shaft 22 connected to the output shaft of a small electric motor 20 as a drive source, which is arranged at the bottom of the base 10.
A clutch mechanism 24 that is detachably and urgingly pushed and screwed
And a slider 26 provided on the upper part of the base 10 through a through-hole 28 formed in the base 10 to operate the clutch mechanism 24, and a bearing axially supported on the upper part of the slider 26. A pair of slide guides 32 for guiding the slider 26 in a straight direction via the clutch mechanism 24.
And a rubber sheet 34 having a notch 35 formed in the central longitudinal direction to seal the connecting member 33 that connects the slider 26. Further, the clutch mechanism 24 is composed of a half nut 38 that is detachably engaged with the screw shaft 22 that passes through the block 36, and a compression spring 40 that elastically presses and urges the half nut 38. .

The syringe injection pump thus constructed holds a syringe (not shown) in a holding section 18 on the base 10 in a detachable manner in parallel, and includes a pressing element slidably inserted into these syringes. One end is locked to the locking portion 27 of the slider 26, and the slider 26 is moved straight by the electric motor 20 so that the liquid or the like filled in each syringe has a constant flow rate to the extracorporeal circulation blood circuit or blood vessel of the patient. It is possible to perform step injection continuously.

[0004]

The conventional syringe injection pump of this type is disposed on the back surface of the slider 26 and the base 10 which are engaged with one end of the pusher and move in the straight direction by a single drive source. Connecting part 3 for connecting with the clutch mechanism 24
3 is inserted through the elongated hole 28 and is sealed by a rubber sheet 34 attached to the back surface of the elongated hole 28 to protect a slide guide 32 provided directly below the elongated hole 28.

However, in the elongated hole 28 formed in this way, liquid or foreign matter is likely to accumulate on the rubber sheet 34 portion of the elongated hole 28, and the foreign matter that has penetrated into the inside through the notch 35 of the rubber sheet 34 is likely to accumulate. When the screw shaft 22 is entangled or attached, the movement of the drive source is not reliably transmitted to the slider 26, the transmission efficiency is lowered, the movement of the slider 26 is impaired, and the pharmaceutical liquid in the syringe is quantitatively and continuously injected into the patient. Irregularities result in a dangerous condition for the patient, and in order to prevent such liquids and foreign substances from entering, the base 10 and the syringe injection pump held by the base 10 must be installed vertically. It had some difficulties such as being constrained such as not being possible.

Therefore, an object of the present invention is to connect a pusher slidably inserted in a syringe held by a holding portion on a base to a syringe by a single drive source in a detachable manner. By engaging the slider that moves straight and guiding and holding the slider in the axial direction of the syringe by the guide means, it is possible to reliably prevent liquid or foreign matter from entering the guide portion of the slider from the outside, and It is to provide a syringe infusion pump capable of achieving stable movement.

[0007]

In order to achieve the above-mentioned object, the syringe pusher held on the base is locked to a slider capable of advancing and retreating and is moved straight by a drive source. In a syringe injection pump that continuously and quantitatively and continuously dispenses a drug solution or the like filled inside, this syringe injection pump is slidable inside the syringe holder and a holding part formed to hold the syringe on the base. A slider that has a locking portion that locks with a pusher that is inserted into the slider and that is removably connected to a single drive source and that moves linearly; and this slider is inserted and guided and held in the axial direction of the syringe. And a guide means.

In this case, the guide means has a U-shaped cross section whose both ends are supported by the ends of the holding part and the supporting parts attached to the upper end of the base, and is guided inside the opening. It is preferable that the guide rod is formed by a guide rod having a path and a bearing provided inside the slider so as to be inserted into the guide path inside the guide rod, and the guide rod slidably supports the inside of the slider. Is.

[0009]

According to the syringe injection pump of the present invention, the pusher slidably inserted into the syringe held by the holding portion on the base can be engaged with and disengaged from the single drive source. By connecting and locking to the slider that moves straight, and by configuring this slider to be guided and held in the syringe axial direction by the guide means, it is possible to prevent liquid and foreign matter from entering the slider guide section from the outside and stabilize the slider. It is possible to improve the reliability of the syringe infusion pump that quantitatively and continuously injects the drug solution or the like into the extracorporeal circulation blood circuit or blood vessel of the patient.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the syringe injection pump according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a plan view of a syringe injection pump according to the present invention,
FIG. 2 is a sectional view taken along line BB of FIG. 1 and 2, reference numeral 42 indicates a base (hereinafter referred to as a frame), and a small electric motor 44 capable of rotating in the normal and reverse directions is attached to a lower portion of the frame 42. The electric motor 44 is a reduction gear mechanism. And a transmission gear (not shown) are integrally assembled. The output shaft of this motor 44 has a screw shaft 4
6 is connected, and the screw shaft 46 is rotatably supported by a bearing, and the screw shaft 4 is supported by a compression spring (not shown).
6 is urged together with the bearing in one direction, and is supported so as to be slightly movable in the axial direction. When a predetermined thrust force is applied to the screw shaft 46 by the operating plate 48 on the motor side of the screw shaft 46, a detector that moves the operating plate 48 to the right side in the figure against the spring and detects it (for example, A limit switch) 50 is fixed to a stay 52 having an inverted L shape.

On the other hand, the center of the upper surface of the frame 42 is formed in a mountain shape from the longitudinal center portion to the end portion, and a pair of holding portions 54 having flat V-shaped groove portions on both sides thereof and outside of the holding portion 54 are formed. Is provided with a pair of clampers 56 that elastically clamp two syringes 58 supported in parallel in the groove from above. Further, one end of a guide rod 62, which constitutes guide means for a slider 64, which will be described later, is supported by a stand 60 fixed to the central end portion of the holding portion 54 formed in a mountain shape and the upper surface of the end portion of the frame 42. The rod 62 is inserted through the slider 64, and guides and supports the slider 64 via a plurality of cam followers 68 supported by a block 66 inserted inside the slider 64.

At the end of the slider 64, the pair of V-groove holding portions 54 is engaged with a syringe 58 clamped by a clamper 56 and is engaged with a syringe 58. The portion 65 is formed, and the locking portion 65 is formed.
The pusher 55 locked to the small electric motor 44 is
The chemical solution in the syringe 58 is smoothly injected into the patient's body by the continuous linear movement of the slider 64 by the.

In this case, the guide rod 62 has a U-shaped cross section whose bottom surface is open, and the cam follower 6 is formed inside the opening.
8 A guide groove 67 formed by a groove into which the outer periphery can be inserted is provided, and the cam follower 68 guided by the guide groove 67 is completely housed inside the guide rod 62, so that liquid or foreign matter from the outside Slider 6 without entering the guide section
4 smooth movement can be secured.

Next, a clutch mechanism for converting the rotational force of the small electric motor 44 into a linear motion and transmitting this motion to the slider 64 or stopping the motion will be described with reference to FIGS. 1, 2 and 3. That is, as shown in FIGS. 1 and 2, the bottom of the frame 42 is disengageable with the screw shaft 46 whose one end is connected to the output shaft of the small electric motor 44.
0 is provided. Then, this clutch mechanism 70
Is a guide shaft 74 provided inside the box body 72 fixed to the bottom of the frame 42 and a frame body 78 integrally molded with synthetic resin in a guide groove 76 formed on the inner side surface of the box body 72 in the axial direction. It is movably supported by the guide.

The frame 78 and the slider 64 provided on the upper surface of the frame 42 are connected via a connecting shaft 80, and a half nut 82 is fixedly supported at the end of the connecting shaft 80 on the frame 78 side. A half nut 82 swingably supported by 80 is pressed and urged against the screw shaft 46 by a compression spring 84 inserted between the half nut 82 and the inner wall of the frame 78.

Further, at the other end of the connecting shaft 80 on the slider 64 side, the knob 8 housed inside the slider 64 is provided.
6 is fixed, and an operating portion of the clutch mechanism 70 is configured by protruding a part of the knob 86 from the side opening of the slider 64 to the outside.

The slider 6 of the operating portion having the above-mentioned structure
The half nut 8 screwed onto the screw shaft 46 is operated by pushing the knob 86 protruding from the four side surfaces with a finger.
2 can be easily separated.

As described above, the rotation of the screw shaft 46, which is rotationally driven by the operation of the small electric motor 44, causes the half nut 8 to rotate.
By linearly moving the slider 64 in the axial direction via 2, the drug solution filled in the syringe 58 can be continuously injected into the patient's body, and the presser 55 moves in a full stroke to move the syringe 58 into the syringe 58. When the chemical liquid is exhausted, the movement of the slider 64 stops, and the thrust force acting on the screw shaft 46 moves the operating plate 48 to the right side in the figure against the spring, and operates the limit switch 50 to stop the motor. You can

[0019]

As is apparent from the above-described embodiments, according to the syringe injection pump of the present invention, the holding portion formed on the base for holding the syringe and the slidable fitting in the syringe. A slider that has a locking portion that locks the inserted pusher and that is removably connected to a single drive source and that moves straight, and guide means that inserts this slider and guides and holds it in the axial direction of the syringe. With this configuration, stable movement of the slider can be obtained by reliably preventing liquids, foreign substances, etc. from entering the guide section of the slider from the outside, and the liquid medicine can be applied to the patient's extracorporeal blood circuit and blood vessels. It has an excellent effect such that the reliability of a syringe injection pump that injects the above and the like quantitatively and continuously can be improved.
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a plan view of a syringe injection pump showing an embodiment of a syringe injection pump according to the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

3 is a cross-sectional view of a syringe injection pump, in which (a) is a view taken in the direction of arrow C in FIG. 2, (b) is a cross-sectional view taken along line DD of FIG. 2, and (c) is shown in FIG. It is an EE sectional view.

FIG. 4 is a plan view of a conventional syringe injection pump.

FIG. 5 is an AA cross-sectional view of a conventional syringe injection pump.

[Explanation of symbols]

10 Base 14 Recess 16 Clamper 18 Holding 20 Electric Motor 22 Screw Shaft 24 Clutch Mechanism 26 Slider 27 Locking Part 28 Long Hole 30 Bearing 32 Slide Guide 33 Connecting Part 34 Rubber Sheet 35 Notch 36 Block 38 Half Nut 40 Compression Spring 42 Base (frame) 44 Small Electric Motor 46 Screw Shaft 48 Operating Plate 50 Detector (Limit Switch) 54 Holding Part 55 Pusher 56 Clamper 58 Syringe 60 Stand 62 Guide Rod 64 Slider 65 Locking Part 66 Block 67 Guide Groove 68 Bearing (cam follower) 70 Clutch mechanism 72 Box body 76 Guide groove 78 Frame body 80 Connecting shaft 82 Half nut 84 Compression spring 86 Knob

Claims (2)

[Claims] 1. A fixed amount of a liquid medicine or the like filled in the syringe is quantitatively and continuously obtained by engaging a pusher of a syringe held on a base with a slider that can move forward and backward and moving the slider linearly by a drive source. In a syringe injection pump for injecting into a syringe, the syringe injection pump includes a holding portion formed on a base for holding the syringe, and a locking member that is locked to a pusher slidably inserted in the syringe. A slider which is detachably connected to a single drive source and moves linearly,
A syringe injecting pump comprising: a guide means for inserting the slider and guiding and holding the slider in an axial direction of the syringe. 2. The guide means has a U-shaped cross section whose both ends are supported by both ends of the holding part and supporting parts attached to the upper end of the base, and a guide path is formed inside the opening. And a bearing provided inside the slider to be inserted into a guide path inside the guide rod, wherein the guide rod slidably inserts and supports the inside of the slider. Item 1. A syringe injection pump according to item 1.