RU2354414C2 - Injection needle of baltabaev's construction and baltabaev's method of its manufacturing - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: group of inventions relates to veterinary and can be used for vaccination, blood intake and infusion. Injection needle contains body in form of tube with base at the end and with sharply grinded working end. End has clipping cutting edge in form of complete turn of spiral line. Ends of spiral line are connected with cutting edge in form of segment which is parallel to tube axis and equals turn height. End with tube base is inserted into syringe cannula with piston. Method of injection needle manufacturing includes operation of cutting out work-piece for needles, thermal processing, rolling in rollers to standard diametre, welding with longitudinal joint, cutting in accordance with needle length and grinding of cuts of not less than two cutting edges. Cutting out work-piece and further operation of grinding of cutting and clipping edges are carried out for one needle on work-piece evolvent in form of trapezoid. Cutting and clipping edges are formed simultaneously with formation of needle tube diametre.

EFFECT: ensuring gradual growth of pressure in cylinder canal of needle, which is transmitted into syringe with operating motion of piston.

6 cl, 2 dwg

Description

The invention relates to devices for subcutaneous injection and to other similar devices used in vaccination, taking and infusion of blood, and can be used in medicine and veterinary medicine.

The prototype of the claimed design of the needle is a hypodermic needle with a non-cutting heel, containing a body in the form of a tube with a through hole, a base for fastening placed on the end and a sharpened working end having a cutting cutting edge in the form of a helix deflecting by ≈260-280 ° when touched, the material being pierced (human skin, sealed drug plugs, etc.) is flanked outward through the open side of the tube and thus does not allow foreign material to bulge inside l the lumen of the tube. In this case, the ends of the helical line are connected by a segment parallel to the axis of the tube (Hypodermic needle with non-cutting heel. US Patent No. 3448740 A, 1966).

A disadvantage of the known needle with the design closest to the claimed one is that the helical line is open with an offset of ≈260-280 °. This geometric shortage of angular size in the form of ≈80-100 ° to a full turn corresponding to the angle of rotation of the cutting helix by 360 °, both complicates and increases the cost of the design of the needle itself, and reduces the manufacturability of the derived structure of the open screw cavity of the working end of the needle. The deformation of human skin and tissues, which is inevitable on these ≈80-100 ° open spiral lines, causes additional pain. Although the pain and overall decrease in the effectiveness of the injection process itself is quenched by the small size of the needle diameter, they can still be avoided by the more rational and technological design of the injection needle.

There is also known a method of manufacturing an injection needle of standard diameter and length, comprising the step of manufacturing a cylindrical needle body in the form of a tube of steel tape by rolling in rolls and seam welding along the entire length of the workpiece, cutting into segments equal to the length of the needle, and machining the profile of the cutting edge pointed needles (single-use injection needle and method for its manufacture RU 2116804, А61М 5/32, B21G 1/08, 1998).

A disadvantage of the known method for manufacturing an injection needle stems from the complex and low-tech design of the needle itself, which requires the high-cost piece technology of at least two oblique cutting edges of the working end of the needle.

The main objective of the invention is to intensify the collection or injection of the drug or blood into the cavity of the needle or from the cavity of the needle into the patient’s body without clogging the cavity at a constant speed and with a gentle regime of highly effective interpenetration with a stably absorbable effect on the body of the contents of the needle cavity working movement of the piston in the syringe.

The surgical task of the invention is to replace the known standard needle ends with a sharpened working end with the working end of the needle with a screw cavity formed by one cutting and the other cutting edges, as a result of which the pain from the injection is localized and concentrated with damping in the screw working cavity of the needle with a smooth the increase in pain at the beginning and the same smooth decrease at the end of the injection.

The indicated tasks of the Baltabaev needle design and the Baltabaev method of its manufacture are solved due to the fact that they automatically form a helix in the form of a full turn of the working cutting and cutting edges of the injection needle, synchronous with the formation of the diameter of the needle tube.

The technical result of the invention is to ensure a smooth increase in pressure in the cylindrical channel of the needle, transmitted to the syringe during the working movement of the piston, is achieved by the fact that the cutting and cutting edges of the needle are made along the helical line in the form of a full turn, while the ends of the helical line profiling the cutting edge and forming coil, interconnected by a segment that performs the function of a cutting edge and parallel to the axis of the tube.

Figure 1 shows the injection needle design Baltabaev; figure 2 shows a scan of the screw profile of the working end of the needle of diameter d in the form of a rectangular triangle ABC. Drawings of figures, corresponding to the standard values of the diameters and lengths of the needles, for clarity, made of arbitrary scale without respecting the proportions.

The injection needle consists of a tube 1 with a diameter d and a length l inserted with its base 2 into the cannula 3 of the syringe 4. The working end 5 of the needle tube 1 is made in the form of a cylindrical screw cavity 6 of diameter d. The cutting edge 7 is made along the helical line 8 in the form of a full turn 9. The cutting edge 10 is parallel to the axis of the tube and made in the form of a segment AB connecting the ends of the helical line 8. The development of the working end 5 of the needle tube 1 is a rectangular triangle ABC pos.11. The aircraft hypotenuse (pos. 12) automatically turns into a helix line 8 when bending the reamer and rolling it in rolls with the formation of diameter d.

Use the injection needle design Baltabaev as follows.

When needle 1 is inserted into the patient’s body, the tip B of the working end 5 of the needle makes an initial cut with puncture of the tissue without rupture and at point B alone, causing minimal irritation to nerve cells. With the further introduction of the needle, the cutting 10 and cutting 7 edges carry out the operation of cutting and cutting tissues as a synchronous continuation of the initial cutting operation at point B already with a given helical trajectory of the cutting operation with tissue shift. The cut is made only by the cutting edge 10. The cutting edge 7, without making a cut, but only synchronously trimming the tissue behind the cutting edge 10, provides shear and non-traumatic penetration of the working end of the needle 1 into the patient’s body along helix 8.

Baltabaev’s method of manufacturing an injection needle design Baltabaev the most simple and technologically advanced of all known technologies for the manufacture of standard injection needles, widely used in the medical industry, and consists of the following operations:

- a cut from a steel strip made of stainless steel, for example, of the grade 12X18H10T of a workpiece with a scan of the working part 5 of the needle in the form of a rectangular triangle ABC;

- heat treatment;

- sharpening the leg AB and hypotenuse BC / 2 / on the scan blanks;

- rolling in micro-rolls to form the diameter d of the needle tube;

- welding with a longitudinal seam along the length l-h.

The main difference between the Baltabaev method is the automatic formation of the working end 5 of the needle 1 in the form of a helical cavity 6, synchronous with the formation of the diameter d of the needle tube 1.

The scientific and physical essence of the invention lies in the fact that the helical movement, or helix, is the addition of rotational motion and translational movement, and if the introduction of the needle 1 into the patient’s body can be represented as an example of the translational movement of the cutting edge 10, then the cutting edge 7 with its helical geometry 8 provides rotational-shear and continuous penetration of the working end 5 of the needle 1 into the patient’s body with minimal nervous irritation and tissue damage.

The medical and biological essence of the invention consists in the fact that the helical cavity 6 provides the most complete and uniform contact with the patient’s body tissue of the working end 5 of the needle tube 1 and, accordingly, the entire cavity 6 from point B to point A with a rotation of 360 °, which is achieved a smooth increase in pressure in the cylindrical channel of the needle 1, transmitted to the syringe 4 during the working movement of the piston / not shown /.

The positive effect of using the claimed injection needle and the method of its manufacture is achieved:

- simplicity and high manufacturability of the manufacture of the working part of the needle with a helical cavity and with cutting and cutting edges that do not require the cost of manufacturing a screw profile;

- synchronization of the rectilinearly directed cut operation with the operation of cutting body tissues along a helix, which automatically ensures rotational-shear and continuous penetration of the screw cavity of the working end of the needle into the patient’s body without clogging the cavity and with a constant speed of highly effective interaction and exposure of the contents of the needle cavity to the body;

- atraumatic and sparing mode, as a result of which the pain from the injection is localized and concentrated with damping in the screw working cavity of the needle;

- a screw working cavity of the working end of the needle, which provides the most complete and uniform contact with the patient’s body tissue along the entire length of the cutting and cutting edges with a rotation of 360 °, which ensures a smooth increase in pressure in the cylindrical channel of the needle, transmitted to the syringe during the working movement of the piston.

Claims (6)

1. Injection needle containing a tube-shaped body with a base located at the end and with a sharpened working end having a cutting edge in the form of a helix, the ends of which are connected to the cutting edge in the form of a section parallel to the axis of the tube, characterized in that the cutting cutting the edge is made in the form of a full turn of a helical line, with the segment connecting the ends of the helical line equal to the height of the turn, and the end with the base of the tube is inserted into the cannula of the syringe having a piston. 2. The needle according to claim 1, characterized in that it has a sharpened working end containing at least two cutting edges converging with a narrowing to the tip. 3. The needle according to claim 1, characterized in that it has a housing made of a standard tube. 4. A method of manufacturing an injection needle, including the operation of cutting a workpiece for needles, heat treatment, rolling in rolls to a standard diameter, welding with a longitudinal seam, cutting along the length of the needle and sharpening slices of at least two cutting edges, characterized in that the cutting of the workpiece and the subsequent operation sharpening of the cutting and cutting edges is carried out for one needle on the scan of the workpiece in the form of a trapezoid, and the cutting and cutting edges are formed simultaneously with the formation of the diameter of the needle tube. 5. The method according to claim 4, characterized in that the trapezoidal scan of the preform is performed with a length of 1 equal to the length of the needle and a width of πd, where d is the standard diameter of the needle tube, while the scan from the side of the working end of the needle is made in the form of a rectangular triangle with legs, equal to the height of the turn h, and with hypotenuse equal to the length of the helix. 6. The method according to PP.4 and 5, characterized in that the welding with a longitudinal seam is carried out at a length of 1-h.

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