SU1745264A1 - Appliance for administering medical agents - Google Patents

Abstract

Use: in medicine for administration and automatic dosage of drugs. SUMMARY OF THE INVENTION: The device comprises guides in which a gear rack with a recess is arranged coaxially with the axis of the syringe. The rail is installed with the possibility of rotation until its teeth exit from engagement with the teeth of the drive wheel and is spring-loaded towards the latter,. The driving wheel is connected to the synchronous motor via a switch 3 of sludge controlled by means of the order of the device.

Description

The invention relates to medical technology, namely to devices for administering drugs.

Apparatus for administering drugs are known, comprising a syringe, the piston rod of which is connected to the actuator, and these actuators are of various types.

The closest in technical essence to the proposed solution is a device for injecting medicinal substances, containing a syringe, a rack-and-pinion drive mechanism, the rod of which is installed in the guides with the possibility of acting on the piston rod, and the gear system is driven by an anchor that oscillates from an electromagnet connected to a pulse generator. Its advantages can be attributed to the ability to regulate the supply of the drug according to a given program. In addition, the pulsed feed rate allows, in the event of a breach in piston mating density, to reduce the leakage of the drug substance into the inter-piston gap, which is characteristic of slow feeds of a high fluidity of the drug.

However, this device is structurally difficult. This is caused by the presence of a whole system of gears with a movable anchor. The use of a gear system is due to the need for a large gear ratio. Otherwise, the feed rate will be unacceptably large. In addition, due to the fact that the issue with the return of the rail to its original (initial) position in this device has been solved with the help of a ratchet mechanism and when the rail is returned, it is necessary to accurately bring the lever to the piston (the ratchet mechanism prevents it from moving forward) not convenient to use.

The purpose of the invention is to simplify the design of the device.

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To achieve this goal, a drug injection device containing a syringe, a rack-and-pinion drive mechanism, the rack of which is installed in the guides with the possibility of interaction with the piston rod, the drive wheel of the rack-and-pinion mechanism is connected to a synchronous motor connected to an AC power source. constant frequency through a switch controlled by a time - setting device.

Improving the ease of operation of the device is achieved by the fact that the rail is installed in the guides in such a way that its working part disengages from the drive wheel at the moment of the end of the working stroke of the piston rod. Such an implementation eliminates the question of turning off the engine when the rail reaches its extreme position and simplifies the operations of changing the syringe to another (new)

A further increase in the ease of operation of the device is also achieved by installing the rail in the guides, which can be rotated before its teeth exit from engagement with the teeth of the drive wheel and springing it towards the latter. Indeed, in this case, the rail moves freely back and forth and is easily supplied to the syringe piston.

FIG. 1 schematically shows the general scheme of the device; FIG. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one.

The device consists of a syringe containing a housing 1, a piston 2, a piston rod 3 and a capsule 4, on which a tube 5 with a needle 6 is mounted. In the guides 7 of the device, a rack 8 is mounted along the axis of the syringe, its end 9 is in contact with the rod 3. The rail 8 is made in the form of a round rod with a toothed working part 10, a handle 11 and a longitudinal groove 12. In the groove 12 is placed a pin 13 connected through the spring 14 to the device body. The length of the groove 12 is selected from the condition of unimpeded movement of the rail 8 within its working stroke. The rail 8 is installed in the guides 7 rotatably until its teeth 10 exit from engagement with the teeth of the drive wheel 15 (when the rail is rotated, it under the action of the spring 14 tends to return to the engagement). In this case, the rail 8 is mounted in the guides 7 in such a way that its working part 10 disengages from the drive wheel 15 (the disengagement is ensured by dredging a) at the time of termination

the stroke of the rod 3 size I is equal to the magnitude of the stroke). This is ensured constructively, for example, by the length of the rail 8. The drive wheel 15 is mounted on the shaft 16 of the synchronous motor 17. The gear ratio is determined by the nominal speed of the engine and the upper limit of the drug delivery rate range, which ensures normal syringe operation without leakage. The motor 17 is connected to a constant-frequency AC power source 18 (this is a typical network) through a controllable time setting

5 devices 19 switch 20.

The device also contains a signaling device 21 of the end of the stroke of the light and / or sonic type. The detector 21 can be made as a contact closing the rail in the extreme position (shown) or using the time setting device 19, which generates a command after a specified feed time. Through time a setting device is easy

5 to carry out additional alarms of the detector during the feeding process, which allows controlling the procedure.

The device works as follows.

The syringe is filled with the preparation and installed in the device with the rail 8 retracted to the extreme left position. After which the end of 9 rails 8 leads t to the rod 3. How

5 noted above, the rail is moved when it is rotated. The rotation is performed using the handle 11, tilting it along the arrow (Fig. 2 and 3). If the teeth of the slats do not immediately engage, then this will be done automatically by the action of the spring-loaded pin 13 after the start of the working stroke of the slats. Then the needle 6 is punctured and the device is turned on.

The magnitude and the law of filing is determined by

5 by a program set in time by the driver, which periodically switches the engine 17 on and off with the help of the switch 20. At the end of the piston stroke, the teeth of the rail 8 come out of the engagement with

0 teeth of the drive wheel. The indicator 21 gives a signal that the drug has been injected, and the engine is not turned off. The procedure can be continued by returning the rail 8 to its original position and

5 filling the syringe.

The device allows the administration of drugs in the widest range of feed rates. It is distinguished by its simplicity and ease of use, allowing the most diverse preparations to be injected with the worst (piston gap) syringes.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A device for administering drugs, comprising a syringe, a rack-and-pinion drive mechanism, the rack of which is installed with the ability to interact with the piston rod, characterized in that, in order to simplify the design and increase the convenience of operation, there mechanism is connected to a synchronous electric motor through a switch controlled by the time of the setting device, the rail has a notch and is installed in the guides with the possibility of turning About the release of its teeth from engagement with the teeth of the drive wheel and its working part and is spring-loaded towards the drive wheel. // g 12 7 Al. eight 8, A Ј f Riga.1 PM.2