JPH0323247Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a safe and easy-to-handle syringe-type step injection pump that can alternately inject two types of medicinal solutions step-by-step in an arbitrary setting pattern. It is.

[Conventional technology]

Generally, syringe-type step infusion pumps have two
The syringes are equipped with removable syringes, and drive plates that move linearly are in contact with the inner cylinders of these syringes, and by the displacement of the drive plates, different types of medicinal solutions filled in each syringe are delivered to the patient. It is known as a device configured to enable continuous, alternate step injection at a constant flow rate into a blood vessel or the like.

Conventionally, syringe-type injection pumps are known to be driven by a single screw shaft, but in this case, one or two syringes are simultaneously driven by a drive plate that moves linearly on the screw shaft. Because of this structure, there is a drawback that, for example, it is not possible to alternately inject two types of medicinal solutions with two syringes in an arbitrary set pattern.

Therefore, an automatic injection/suction device has been proposed that automatically injects two types of medicinal solutions into a living body at different amounts and times (Japanese Patent Publication No. 49-2552). This automatic injection suction device transmits the rotation of a reversible motor to a rotating main shaft consisting of a screw shaft through a multi-stage speed changeover device, and an injection suction excitation plate is screwed to this rotational main shaft, and a stopper is attached to the excitation plate. and the actuating plate is engaged with the end of the sucker of the syringe through this stopper, and a separate reversible motor and multi-speed changeover device are provided for each of the two parallelly arranged syringes. This allows each syringe to be adjusted and controlled independently, allowing one syringe to transfuse blood while the other syringe draws blood from the body, or administering two types of medicinal solutions at the same time and in different amounts. It is constructed so that it can be injected at different times.

[The problem that the idea aims to solve]

However, in the conventional syringe-type infusion pump described above, each syringe is provided with a separate drive means, so when injecting two types of drug solutions, for example, it is difficult to inject each drug solution at the same time and at different times and amounts. However, in order to alternately inject in an arbitrary setting pattern, it is necessary to synchronize separately provided drive means, which has the disadvantage that the control mechanism becomes even more complex.

Therefore, the purpose of the present invention is to provide two syringes with drive plates screwed onto screw shafts, respectively.
These driving push plates are configured to be rotated forward and reverse by a single electric motor, and the timing of the forward and reverse rotations enables alternate step injection of drug solution into each syringe in an arbitrary set pattern. The purpose of the present invention is to provide a syringe-type step infusion pump that can be used.

[Means to solve the problem]

The syringe-type step injection pump according to the present invention rotatably supports two parallel threaded shafts,
Two disposable syringes are arranged adjacently to these screw shafts, and driving push plates that engage with and move the flange portion provided at the inner cylinder end of the syringes are screwed together, and each of the above-mentioned Transmission gears are coaxially coupled to the ends of the screw shaft via spring clutches that can transmit rotation in only one different direction, and these transmission gears are each meshed with a pinion coupled to a single electric motor. The present invention is characterized in that the electric motor is driven to rotate in forward and reverse directions to rotate the screw shaft alternately, thereby performing step injection of the medicinal liquid or the like filled in each syringe.

[Effect]

According to the syringe-type step injection pump of the present invention, two disposable syringes are provided parallel to each of the two threaded shafts, and a transmission gear is connected to each of the threaded shafts via a spring clutch. At the same time, by meshing a pinion connected to a single electric motor with these transmission gears, the electric motor can be alternately rotated forward or backward, thereby selectively rotating the electric motor with respect to one of the screw shafts. The rotational driving force of is transmitted,
As the screw shaft rotates, the drive plate for moving the syringe inner cylinder of each syringe alternately moves, making it easy to alternately and continuously inject a chemical solution or the like from each syringe.

〔Example〕

Next, embodiments of the syringe-type step infusion pump according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 2 indicates a small electric motor capable of forward and reverse rotation, and this electric motor 2 is integrally assembled via a reduction gear mechanism 3 and a transmission gear (not shown), and a motor support 4, and is fixedly placed on the frame 1. Therefore, the rotational driving force generated by the electric motor 2 rotationally drives the pinion 5 provided in the reduction gear mechanism 3.

However, on the frame 1, there is a pair of bearing parts 1.
Two parallel screw shafts 11, 12 by 0, 23
are supported, and transmission gears 6 and 7 are coaxially connected to one ends of these two screw shafts 11 and 12 via spring clutches 8 and 9, respectively. These transmission gears 6 and 7 are located close to each other so as to be able to rotate within the same plane, and the pinion 5 is configured to mesh with the intermediate portion of these transmission gears 6 and 7.

The pair of screw shafts 11, 12 and spring clutches 8, 9 are used with opposite hands.

FIG. 2 shows a cross-sectional structure of the bearing part 10,
A screw shaft 12 is rotatably supported by a bearing 24, and at the end of the screw shaft 12, a boss portion of a transmission gear 7 is connected to a spring clutch 9 as shown in the figure.
connected via. Note that the screw shaft 11 is also configured in the same manner. In addition, Fig. 3 shows the screw shaft 1
1 shows a cross-sectional structure of a bearing portion 23 that pivotally supports the other ends of screw shafts 11 and 12, and each screw shaft 11 and 12 is rotatably supported by bearings 24 and 24 as shown. Note that this bearing portion 23 is fixed to the frame 1 with an appropriate fastener.

Syringe holders 21 and 22 are fixed on the frame 1 adjacent to the screw shafts 11 and 12, and each of the screw shafts 1 is attached to the syringe holders 21 and 22.
1 and 12, disposable syringes 19 and 20 are detachably fixedly arranged. on the other hand,
The threaded portions of the screw shafts 11 and 12 are provided with a driving press plate 1.
3 and 14 are screwed together, respectively, and this driving push plate 13,
Each syringe inner cylinder 17 of the disposable syringe 19, 20 adjacently arranged in a part of 14,
The flange portion, which is the end portion of 18, is fitted and fixed. Therefore, the screw shafts 11, 12
When rotated in a predetermined direction, the driving press plates 13 and 14 move the screw shafts 11 and 12 by the action of the feed screws, respectively.
, and the syringe inner cylinders 17 and 18 are pushed into the syringes 19 and 20 via the flange portions.

Next, the operation of the syringe type step injection pump according to the present invention constructed as described above will be explained.

As described above, in this embodiment, the pinion 5 provided on the output shaft of the reduction gear mechanism 3 is driven by the electric motor 2 to generate the required reduction rotational drive, and this rotational movement is transmitted to the transmission gears 6 and 7. are rotated in the same direction, and this rotation is transmitted to either one of the screw shafts 1 via spring clutches 8 and 9.
1 and 12. However, in this embodiment, the configurations of the screw shafts 11 and 12 and the winding directions of the spring clutches 8 and 9 are set in opposite directions.

Now, if the electric motor 2 is rotated in the forward direction, the spring clutch 9 will move against the screw shaft 12 as shown in FIG.
The outer diameter surface of the transmission gear 7 is strongly tightened to transmit the rotational force of the electric motor 2 to the screw shaft 12, and the drive press plate 14
Move the syringe inner cylinder 18 linearly in the direction of arrow B.
can be pushed into the syringe 20 to inject the medicinal solution filled into the syringe 20. At this time, the spring clutch 8 that connects the other transmission gear 6 and the screw shaft 11 slips, the rotational force of the electric motor 2 is not transmitted to the screw shaft 11, the drive plate 13 does not move, and the chemical liquid etc. will not be injected.

Next, when the electric motor 2 is rotated in the reverse direction, the spring clutch 8 strongly tightens the screw shaft 11 and the outer diameter surface of the transmission gear 6, transmitting the rotational force of the electric motor 2 to the screw shaft 11, and driving the drive plate 13. is moved linearly in the direction of arrow A, the syringe inner cylinder 17 is pushed into the syringe 19, and the medicinal liquid etc. filled in the syringe 19 can be injected. At this time, the spring clutch 9 that connects the other transmission gear 7 and the screw shaft 12 slips, the rotational force of the electric motor 2 is not transmitted to the screw shaft 12, the drive plate 14 does not move, and the chemical liquid etc. will not be injected.

In this way, by alternately rotating the electric motor 2 in the forward and reverse directions at predetermined timings, it is possible to alternately inject two types of medicinal solutions filled into the two syringes 19 and 20 in a step manner. can. That is, it is possible to arbitrarily set the time for forward rotation and the time for reverse rotation of the electric motor 2, thereby injecting two types of chemical solutions alternately and continuously in an arbitrary setting pattern. be able to. In addition, each syringe 19,
The syringe holders 21 and 22 holding the syringe 20 include
By providing limit switches 15 and 16 opposite to drive press plates 13 and 14, syringe inner cylinder 1
The configuration is such that the maximum pushing position of the syringes 19 and 20 of syringes 7 and 18 is detected to determine completion of injection of the drug solution and the like, and the drive of the electric motor 2 is stopped.

[Effect of idea]

As is clear from the above-mentioned embodiments, according to the present invention, two disposable syringes are provided parallel to the two screw shafts and filled with a drug solution, respectively, and a spring clutch is attached to each of the screw shafts. A pinion connected to a single electric motor is engaged with the transmission gears, and the electric motor is rotated forward or backward to selectively rotate the one screw shaft. The rotational driving force of the electric motor is transmitted to the syringe, and by the rotation of this screw shaft, the drive plate that operates the syringe inner cylinder of each syringe is alternately moved linearly, and the drug solution is alternately and continuously released from each syringe. It is possible to easily and programmably perform step injections such as the following.

In particular, according to the syringe-type step infusion pump of the present invention, by forward and reverse rotation by a single electric motor, step infusion of two types of medicinal solutions using two syringes in an arbitrary setting pattern can be easily performed. This structure has the advantage of being able to be achieved safely and reliably, and its practical effects are extremely large. In this case, if the rotational speeds of the electric motor in forward and reverse rotations can be changed, it is also possible to control the flow rate of the step-injected chemical solution, etc.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various improvements and changes can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory plan view showing an embodiment of the syringe type step infusion pump according to the present invention, Fig. 2 is a sectional view taken along the line C-C' in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line D in Fig. 1. -D′ arrow sectional view. 1...Frame, 2...Small electric motor, 3...
...Reduction gear mechanism, 4...Motor support, 5...
Pinion, 6, 7... Transmission gear, 8, 9... Spring clutch, 10... Bearing part, 11, 12...
...Screw shaft, 13, 14...Driving push plate, 15, 16
...Limit switch, 17,18...Syringe inner cylinder, 19,20...Syringe, 21,22...
Syringe holder, 23...Bearing section, 24...Bearing.

Claims (1)

[Scope of utility model registration request] Two parallel screw shafts are rotatably supported, two disposable syringes are arranged adjacent to these screw shafts, and the syringes are engaged with a flange portion provided at the inner cylinder end of the syringe. drive plates for moving the screw shafts are screwed together, and transmission gears are coaxially connected to the ends of each of the screw shafts via spring clutches that can transmit rotation only in one different rotation transmission direction. each meshing with a pinion coupled to a single electric motor,
A syringe type step injection pump, characterized in that the electric motor is driven in forward and reverse rotations to alternately rotate the screw shaft to perform step injection of a drug solution or the like filled in each syringe.