RU219479U1 - Needle with an eye - Google Patents

Abstract

The utility model relates to medicine, namely to traumatology and orthopedics, and can be used to pass suture material through a hole in a bone. The spoke includes a handle and a working part. The working part is represented by a flat spring. The flat spring includes the first cantilevered end connected to the handle and the second free end including an oval hole. The length of the flat spring lies in the range of 190 mm, its width is 3 mm, and its stiffness is 0.086 N/mm. The use of the proposed needle with an eye makes it possible to reduce the trauma of passing the suture material through a narrow canal in the bone due to the size of the needle and its physical characteristics, such as flexibility and rigidity, which make it possible to quickly and non-traumatically carry out the above manipulation. 8 ill.

Description

The utility model relates to medicine, namely to traumatology and orthopedics, and can be used to pass suture material through a hole in a bone.

A set of conductors V.I. Rozov for carrying out various auto-, allo- and heterotransplants (Nikitin G.D. et al., Allotendoplasty in the treatment of injuries of muscles, tendons and ligaments, 1994, p. 38). The conductors are made in the form of flat metal plates, which can have different diameters and different sections. One of their ends is a spatula-like handle, the other, with a blunt end, has a hole for fixing the graft in it.

Known set of tools V.V. Khaimina (Nikitin G.D. et al., Allotendoplasty in the treatment of injuries of muscles, tendons and ligaments, 1994, p. 39). In this set, the conductor has a similar structure, but its end is rounded, and the handle is more comfortable.

A common disadvantage of these instruments is that it is not always possible to pass the suture material of the sutured tendon through a narrow hole formed in the bone channel without its partial destruction; the instrument may get stuck during difficult surgical access.

Also known from the prior art spoke for conducting material through the bone (USSR author's certificate N 1623627 A1), which is also a conductor. Its end is pointed, and the other is flat. The latter has asymmetric slopes of various depths for fixing the material. However, the use of such an instrument is fraught with cutting of the suture material during its passage through the bone, as well as damage to the sutured tendon itself.

A tendon conductor is also known (utility model patent RU 47209 U1, publ. 27.08.2005) through bone-fibrous canals. The conductor contains a rod with a flexible rod at the distal end, the distal end of the rod passes through the channel of the cone-shaped cap made of bioinert material, is fixed to the conductive end of the tendon, on which the cap is fixed. The device is again difficult to use for working in narrow channels, the ends of the ligatures may slip out of the channel, the need for repeated manipulations.

Thus, there is a need for an eyed pin to pass a suture through a hole in a bone free from the above disadvantages.

EFFECT: reduction of the traumatism of passing the suture material through a narrow channel in the bone due to the dimensions of the pin and its physical characteristics, such as flexibility and rigidity, which make it possible to quickly and non-traumatically carry out the above manipulation.

This is achieved due to the proposed utility model, namely, a pin with an eye for passing suture material through a hole in the bone, including a handle and a working part, characterized in that the working part is made in the form of a flat spring, which includes a first cantilever-pinched end connected to the handle, and a second free end, including an oval hole, while the flat spring has a length of 190 mm, a width of 3 mm and a stiffness of 0.086 N/mm.

The utility model is shown in the diagram, where in Fig. 1 is a side view, Fig. 2 is a general view of the device, in Fig. 3-7 shows the stages of the suture material of the torn tendon using the proposed needle with an eye, in Fig. 8 photos of knitting needles with an eye.

The spoke consists of a handle (1) and a working part (2). The working part (2) is represented by a flat spring, while the flat spring includes the first cantilevered end (3) connected to the handle (1), and the second free end (4), including an oval hole - eye (5), while the length of the free end (4) of the flat spring is 190 mm, the width is 3 mm, the thickness is 1 mm, and its rigidity is 0.086 N/mm. The working part is made of steel semi-hard-worked, hard-worked or highly hard-worked tape, which ensures its sufficient strength and flexibility.

To disclose the above characteristics, it is necessary to make the following explanations.

So, the allowable tension of a flat spring is:

where σ _{0.2 PN} is the yield strength for a steel semi-hard-worked tape = 500 N/mm ² , σ _0.2n is the yield strength for a steel hard-worked tape = 900 N/mm ² , σ _{0.2 in} is the yield strength for a steel highly hard-worked tape = 1200 N/mm ² , K is the safety factor = 1.2, and, accordingly, the value [σ _0.2 ] _mon \u003d 416.6 N / mm ² , value [σ _0.2 ] _n \u003d 750 N / mm ² , value [σ _0.2 ] _int \u003d 1000 N / mm ² .

The permissible load on a flat spring is:

where [σ _0.2 ] _{pn, n, vn} is the allowable stress of a flat spring when using steel semi-hardened, hard-worked, highly hard-worked tapes, calculated by formula (1) with the corresponding yield strengths, b is the width of the spring, 3 mm, h is its thickness, 1 mm, 1 is its length, 190 mm. Thus, the value of the allowable load on a flat spring made of semi-hard-worked steel tape is 1.07 N, the value of the allowable load on a flat spring made of steel work-hardened tape is 1.93 N, the value of the allowable load on a flat spring made of highly hard-worked steel tape is 2.57 N.

In this case, the deflection of a flat spring at an arbitrary point A, depending on the allowable load, is:

where R _{pn, n, vn} - allowable load on a flat spring when using steel semi-hard-worked, hard-worked, highly hard-worked tapes, calculated by formula (2) with the corresponding values of the allowable stress of a flat spring, b - width of the spring, 3 mm, h - its thickness, 1 mm, 1 - its length, 190 mm, E - coefficient = 1.98. Thus, the deflection value of a flat spring made of semi-hard-worked steel band is 12.35 mm, the deflection value of a flat spring made of steel hard-worked band is 22.28 mm, and the deflection value of a flat spring made of highly hard-worked steel band is 29.68 mm.

The stiffness of a flat spring is calculated by the formula:

where R _{pn, n, vn} is the allowable load on a flat spring when using steel semi-hard-worked, hard-worked, highly hard-worked tapes, calculated by formula (2) with the corresponding values of the allowable stress of a flat spring, fa is the deflection of a flat spring when using steel semi-hard-worked, hard-worked, highly hard-worked tapes, calculated by formula (3) with the corresponding values of the allowable load on a flat spring.

Thus, the value of the rigidity of a flat spring, regardless of the cold hardening of the steel tape used for its manufacture, is C _n = 1.07 / 12.35 = Cn = 1.93 / 22.28 = C _ext = 2.57 / 29.68 = 0.086 N / mm.

The needle is used as follows. The damaged tendon is brought out into the wound (Fig. 3). The tendon is stitched with two nylon threads, leaving 4 ends of the ligatures free (Fig. 3). The damaged tendon is passed from the operating wound of the shoulder to the wound of the forearm in the tendon canal (Fig. 4). Form a channel in the bone (Fig. 5). Spend the ends of the ligatures through the channel in the bone using the proposed spokes (Fig. 6). Fixation of the muscle tendon is carried out by the removed ends of the ligatures, for example, as shown in Fig. 7. In FIG. 8 photos of the spokes separately in direct projection.

The use of the proposed needle with an eye makes it possible to reduce the trauma of passing the suture material through a narrow canal in the bone due to the size of the needle and its physical characteristics, such as flexibility and rigidity, which make it possible to quickly and non-traumatically carry out the above manipulation.

Claims (1)

A pin with an eye for passing suture material through a hole in the bone, including a handle and a working part, characterized in that the working part is made in the form of a flat spring, which includes the first cantilever-pinched end connected to the handle, and the second free end, including an oval hole, while the flat spring has a length of 190 mm, a width of 3 mm and a stiffness of 0.086 N/mm.

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