RU2101035C1 - Device for making retrobulbar anesthesia - Google Patents

Abstract

FIELD: medical engineering. SUBSTANCE: device has handle, external hollow tube which operation end has bevel cut, and internal hollow tube which conic operation end is dead and rounded. Syringe is telescopically movably placed inside the handle. The syringe is connected to the connectable in parallel to electromagnet. The whole device is connectable to the internal tube. Syringe cone has external diameter that is equal to cylindrical internal cavity diameter of the handle. EFFECT: enhanced effectiveness in injecting drugs. 2 cl, 6 dwg

Description

 The invention relates to medicine, namely to ophthalmology and can be used for retrobulbar administration of drugs, for example, for retrobulbar anesthesia.

Known syringe for the introduction of medicinal substances, containing a housing, a piston, a hollow needle [1]
Retrobulbar administration of drugs by a known syringe is associated with a risk of perforation of the eyeball with the sharp end of the hollow needle, trauma to large vessels with the development of extensive hemorrhage, and also puncture of the optic nerve up to irreversible loss of vision. In addition, the depth of injection of the hollow needle cannot be dosed, although it is known that it is necessary to introduce it to a depth of 4.5 cm in retrobulbar fiber. A lack of anesthesia leads to insufficient ciliary node infiltration does not occur. And during a break, in addition to insufficient anesthesia, the risk of damage to the neurovascular bundle is further increased, because the sharp end of the needle enters the apex of the orbit, where the neurovascular elements are more concentrated. In addition, it is possible to puncture the wall of the orbit by hitting a needle in the main sinus or brain. It should be noted that all manipulations with retrobulbar anesthesia are performed without visual inspection, i.e. blindly.

 Known trocar [2] containing a hollow outer tube with an oblique sharpened slice at the working end and the handle and freely placed in the outer inner tube. The working end of the inner tube is muffled, has several holes on the side surface.

 The famous trocar is taken as a prototype according to the design features of the working ends of the outer and inner tubes. The trocar is intended for punctures and drainage of various cavities, i.e. not applicable for drug administration.

 We set the task of eliminating the above disadvantages of the known syringe and trocar, i.e. to ensure non-invasiveness, effectiveness and safety in retrobulbar anesthesia.

 The problem is solved by a device containing a handle, an external, internal hollow tube. Inside the handle there is a syringe connected to the inner tube with the possibility of telescopic movement; the outer diameter of the syringe body corresponds to the diameter of the inner cylindrical cavity of the handle, in addition, the handle and the outer tube are equipped with limiters for the depth of injection.

 The presence of an external hollow tube provides a puncture of the dense tissues of the eyelid and tarsoorbital fascia. The limiter mounted on it provides a predetermined safe depth of injection of the external hollow tube. This eliminates the likelihood of perforation of the eyeball, vascular injury in retrobulbar fiber and the optic nerve.

 The presence of an inner tube with a cone-shaped rounded working end with holes that can be telescopically moved in the outer tube and set the working end out of the outer tube to a predetermined value provides blunt penetration into retrobulbar cellulose, which has a loose soft structure, without injuring blood vessels and the optic nerve. Holes on the working part of the inner tube provide anesthesin infiltration in retrobulbar fiber. The presence of a limiter ensures the introduction of the inner tube to a strictly predetermined depth, eliminating the likelihood of a perforation of the orbit wall and the penetration of the working end of the inner tube into the cavity of the brain. Sharpening the working end of the outer tube with a point to its inner surface reduces trauma during device manipulations in the retrobulbar region eliminates trauma to the bones of the upper jaw and the eyeball.

 In FIG. 1 shows a General view of the device, a longitudinal section; in FIG. 2 the same, the working end of the inner tube is extended by a predetermined amount; in FIG. 3 node I in FIG. one; in FIG. 4 the working end of the outer tube is pierced into dense tissue; in FIG. 5, the working end of the inner tube passes into retrobulbar fiber; in FIG. 6, the inner tube is at a predetermined depth.

 The device comprises a handle 1 made in the form of a hollow cylinder with a conical tip 2, an external hollow tube 3 with a conical base 4 for connection with the tip 2 of the handle 1, the working end of which is sharpened with a tip to the inner surface, a syringe 5 with a conical tip 6 and a shoulder 7 , piston 8, stem 9, cap 10. The outer diameter of the syringe body 5 corresponds to the inner diameter of the cavity of the handle 1. The device also has an inner tube 11, the conical working end 12 of which is rounded, has openings 13 for the drug to exit this substance; the upper end of the inner tube 11 is provided with a conical base 14 for connection with the conical tip 6 of the syringe 5; the limiter 15, made in the form of a ring, which provides a puncture of the outer tube 3 of dense tissue to a predetermined depth; the limiter 16, made in the form of a ring, which provides a puncture of the inner tube 11 into retrobulbar tissue to a predetermined depth.

 The working end 17 of the outer tube 3 is sharpened with a tip to its inner surface, which eliminates tissue injury during manipulation of the device.

 The proposed device is used as follows.

 Anesthesin is sucked into the syringe 5 of the device by means of the piston 8. In the initial position of the device, the inner tube 11 is drawn into the outer tube 3. The outer hollow tube 3 pierces the skin of the lower eyelid (in the area of the outer corner of the eye) and the tarsus fascia directly above the lower edge of the orbit.

 It has been experimentally proved that the optimal penetration depth of the external hollow tube is 2.0 2.3 cm, which is provided by the limiter 15. At this depth, large blood vessels do not adjoin, i.e. the working end of the outer tube does not reach the posterior pole of the eyeball. Syringe 5 and with it the outer tube is moved down. The cone-shaped working end 12 of the inner tube 11, bluntly pushing the tissue, passes to the specified pole of the eye in the region of the neurovascular bundle. It has been experimentally proved that the optimal depth of insertion of the inner tube (cannula) is 4.3 4.7 cm, which is pre-set by the stopper 16. Moving the piston 8 downward, anestezin is introduced into the retrobulbar tissue. After which the device is removed.

 Using the proposed device provides non-invasiveness, safety and effectiveness of retrobulbar anesthesia, relieves the psychological stress of the surgeon.

Claims (2)

 1. Device for retrobulbar anesthesia, containing a handle, an external hollow tube, the working end of which has an oblique cut and sharpened with an inclination to the inner surface, an inner hollow tube located in the outer tube with the possibility of telescopic movement and exit from it by a predetermined value, a cone-shaped working the end of which is made blind and rounded, and holes are made on its lateral surface, characterized in that a syringe is connected inside the handle with the possibility of telescopic movement minutes with inner tube, the outer diameter of the housing which corresponds to the diameter of the inner cylindrical cavity of the handle.  2. The device according to claim 1, characterized in that the handle and the outer tube of the device are equipped with limiters for injecting the outer and inner tubes into the fabric to a predetermined depth.

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