RU2234882C1 - Injection device - Google Patents

Abstract

FIELD: medical tools, possibly for drug injection into tissues.

SUBSTANCE: device includes mechanical metering unit with leverage drive; cylindrical housing and rod with regular notches. Rod is joined through stop with pusher of piston of working injector. Device is provided with common casing.

EFFECT: accurate metering of drugs, lowered labor consumption at using easy-to-operate injection device.

2 cl, 2 dwg

Description

The present invention relates to medicine, namely to medical instruments, and can be used for subcutaneous infusions for the treatment of various inflammatory diseases of periodontal, oral mucosa, facial area, diabetes mellitus and other diseases.

One of the most common methods both in the acute period of the disease and in the period of remission as maintenance therapy is the injection of various drugs (antibiotics, vitamins, immunomodulators, etc.) under the oral mucosa, the skin surface of the body.

However, the existing instruments today do not meet the requirements of scientists and clinicians, primarily due to their invasiveness and inability to control (S. A. Rabinovich. Modern technologies of local anesthesia. - Moscow: Moscow, 2000).

Syringes undergo constant changes in the process of improving technology, which confirms the unsatisfactory nature of their device. The basic principles of injection of solutions suggest the use of a syringe as a device that provides the following functions:

- temporary placement of the injected solution;

- creating pressure, under the action of which the drug solution leaves the syringe through a special adapter, hermetically connected to the hollow needle;

- change in the amount of solution supplied from the syringe.

Widely known are glass and disposable plastic injection syringes used for administering drugs into the submucosal cavity of the patient’s mouth, as well as under the skin, into a vein, consisting of a cylindrical body, inside of which a piston connected through a cannula to a needle moves.

Disadvantages:

1. A traumatic needle in glass syringes, not suitable for richly supplied tissues of the oral cavity. Its use leads to microtraumatization, tearing soft tissues and microvessels. The introduction of the needle is quite painful and uncomfortable for the patient.

2. The adapter for connecting to the needle is fixed due to a snug fit, but when pressure is created, the needle may jump off the adapter, which will inevitably lead to tissue injury and partial leakage of the drug substance from the syringe barrel.

3. Many medicinal substances must be administered in microdoses (for example, with diabetes mellitus), and since the amount of fluid injected is regulated by pressure with the finger of a doctor or patient, then the volume of the substance and the degree of pressure may not meet the requirements. Visual control of the scale on the cylinder is very subjective, because the doctor’s angle of view can change and distort indicators, and sometimes in hard-to-reach distal areas the doctor can’t visually control the amount of substance administered.

4. Inconvenience in work, because you have to hold the syringe with one hand and pull the plunger with the other and then administer the medicine.

5. Stressful reaction of the patient to a traditional syringe, fear of injection.

For the prototype, we took a metal karpulny syringe having an emphasis for fingers and a grip on the body, a rod, a piston, a cannula, a needle. The syringe before the introduction of the drug is provided with a carpula and a needle.

These improvements do not eliminate the disadvantages of injection needles listed in the analogue.

Tasks:

Reducing the morbidity, creating simplicity and convenience of drug administration, providing semi-automated procedures and accurate dosing of drugs.

The essence of the invention is that the injector is equipped with a mechanical dispenser having a lever drive and a cylindrical body with a rod, which, in turn, has step notches. The rod is connected by an abutment to the injector piston pusher, the dispenser body with the lever drive located on it and the injector working cylinder placed in a common casing with the condition that the axes of the dispenser rod and the injector piston pusher are parallel.

Additionally, the proposal is illustrated in figure 1 (general view of the device), figure 2 (section of the injector on AA), where 1 is the first body, 2 is the cavity in the body, 3 is the rod, 4 is the step metering notch, 5 is the lever 6 - fixing spring, 7 - axis, 8 - pusher, 9 - second housing, 10 - cavity in the housing, 9, 11, 12 - longitudinal through grooves, 13 - stop, 14 - syringe (injector), 15 - pusher, 16 - the piston.

The injector was tested in outpatient conditions for 64 patients.

The operation of the injector is as follows.

The needle 17 is inserted into the tissue with an injector 14, for example, into the gums and the lever 5 is pressed all the way, which through the axis 8 gives movement to the follower 7, which moves the rod 3 in the cavity 2 of the housing 1 by a distance equal to one step of the metering notch 4. At the same time, a light “Click”, which provides additional control. Simultaneously with the movement of the rod 3 along the grooves 11, 12, the stop 13 fixed in it moves, forcing the pusher 15 and the piston 16 of the injector to move, which ensures the injection of a strictly dosed volume of the drug (antibiotic, anesthetic, anti-inflammatory drug, insulin, etc.). The dose is determined by the pitch of the metering notch 4 on the stem 3. For example, a 1 mm pitch may correspond to 0.1 ml of the drug. After releasing the lever 5, the locking spring 6 returns the pusher 7 to its original position. By pressing lever 5 again, the following doses of the drug can be administered, or an injection is made in a similar way to another place, etc. For ease of use, the injector can be enclosed in a common casing. In the cavity 10 of the housing 9 for injection, a disposable syringe with a medicinal solution is installed. Since the syringes have different lengths, a corresponding pusher 15 is installed in the cavity 10 between the stop 13 and the outer part of the piston 16 of the syringe 14. This allows the use of syringes of different volumes and lengths, for this it is enough to have several interchangeable pushers.

The device when used allows to ensure the dosage accuracy of any drug, easy to use, convenient, does not require visual monitoring of the volume of administration, is additionally mechanized, which ensures the release of one hand of the doctor during the procedure of drug administration. Especially convenient is the use of this injector for anesthesia in the oral cavity, when it is necessary to introduce the same doses of the drug at several points.

Claims (2)

1. An injector comprising a cylindrical working case with a rod and a piston on it inside the cavity, an injection needle, characterized in that the injector is equipped with a mechanical dispenser having a lever drive, a cylindrical body and a rod with a step notch on it, connected with a stop with a piston pusher injector. 2. The injector according to claim 1, characterized in that the dispenser housing with the lever drive located on it and the working housing are placed in a common casing for ease of use, ensuring that the axes of the dispenser rod and the piston of the working piston of the injector are parallel.

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