RU62796U1 - LOCK FOR INTRACOSTIC LOCKING OSTEOSYNTHESIS - Google Patents

Abstract

The utility model relates to medicine, namely to traumatology, can be used in specialized trauma departments of hospitals and clinics of NIITO for surgical treatment, namely for intramedullary osteosynthesis of comminuted fractures of a long tubular bone, for example, a femur. The fixator for intraosseous blocking osteosynthesis contains an intramedullary lockable rod made with a thread at one end and with a transverse threaded hole for a locking screw, a nut screwed onto the threaded end of the rod, while the diameter of the threaded end of the rod is less than the diameter of its main part, on the outer surface of the nut thread for insertion into a spongy substance, on one end there is a blind transverse groove for screwing in, and on the other a blind threaded hole for introducing the threaded end of the rod while the pitch of the external thread of the nut is greater than the pitch of the inner. The diameter of the main part of the intramedullary shaft is less than the diameter of the external thread of the nut screwed onto it. The intramedullary shaft is made with 4 tetrahedral. The locking screw is made with two portions of the thread, one of which coincides with the thread of the hole of the blocked rod, and the other with a sharpening of a smaller diameter for insertion of a fragment or main fragment into the cortical layer.

Description

The utility model relates to medicine, namely to traumatology, can be used in specialized trauma departments of hospitals and clinics of NIITO for surgical treatment, namely for intramedullary osteosynthesis of comminuted fractures of a long tubular bone, for example, a femur.

A device for blocking osteosynthesis [US Pat. RU 2089125 A 61 V 17/72 from 10/09/97], made in the form of a lockable round rod with a threaded hole for a blocking screw in the middle or at the distal end, containing a tapered sleeve with an internal thread, a blocking screw that can be contacted with lockable rod.

The disadvantages of this design are:

- the impossibility of correcting dynamic compression of fragments;

- the impossibility of fixing fragments;

- increased trauma to the installation of the conical sleeve.

The closest in purpose and combination of essential features is a fixative for intramedullary osteosynthesis [ed. St. SU 927239 A 61 V 17/18 from 07.25.79, publ. in bull. No. 18 dated 05/15/82] in the form of a lockable rod of circular cross section with grooves along the entire length, made with a thread on one end and with a semi-tapered end for inserting a metaphysis into the sponge and a number of holes for locking elements in the form of pins on the other, containing a nut, screwed onto a thread, a lock nut, a spiral spring for dynamic compression of fragments and a figured washer modeled on the contact surface of a large trochanter.

The disadvantages of this design are:

- the impossibility of correcting dynamic compression of fragments;

- increased trauma installation of the curly washer;

- high risk of transverse rod migration within the drilled hole.

Tasks solved by the utility model:

- increasing the rigidity of fixation of the main fragments and fragments.

To accomplish the tasks in the fixator for intraosseous blocking osteosynthesis, containing an intramedullary lockable rod made with a thread at one end and with a transverse threaded hole for a blocking screw, a nut screwed onto the threaded end of the rod, in contrast to the prototype, the diameter of the threaded end of the rod is less than its diameter the main part, on the outer surface of the nut a thread is made for cutting into a spongy substance, on one end there is a blind transverse groove for screwing in, and on the other a blind thread a bore hole for introducing the threaded end of the rod, while the step of the external thread of the nut is greater than the step of the internal.

The diameter of the main part of the intramedullary shaft is less than the diameter of the external thread of the nut screwed onto it.

The intramedullary shaft is made with a tetrahedral.

The locking screw is made with two portions of the thread, one of which coincides with the thread of the hole of the blocked rod, and the other with a sharpening of a smaller diameter for insertion of a fragment or main fragment into the cortical layer.

The utility model is illustrated in figure 1 - a schematic representation of the General view of the installed latch.

Description of the design of the inventive latch:

The latch (figure 1) contains an intramedullary locking rod 1, a nut 2 and a locking screw 3.

The intramedullary lockable rod 1 has one end 4 with a thread 5 of a smaller diameter than the diameter of its main part 6. The main part 6 ends with a pointed end cut into the spongy substance metaphase from the medullary canal. In the middle part 6 of the rod 1, a transverse threaded hole 7 is made for the locking screw 3. The intramedullary rod in the main part 6 can be made tetrahedral.

The nut 2 has a thread 8 on the outer surface for cutting into a spongy substance. At one end there is a blind transverse groove 9, with which a screw is screwed in, and on the other a blind threaded hole 10 for interfacing with the threaded 5 end 4 of the rod 1. The external thread 8 of the nut 2 is larger than the step cut along its inner blind hole 10, which in turn is equal to the thread pitch 5 of the threaded end 4 of the intramedullary lockable rod 1.

The locking screw 3 is made with two sections of the thread, one of which 11 coincides with the thread of the transverse hole 7 of the lockable rod 1, and the other 12 with a sharpening of a smaller diameter for introducing a fragment or main fragment into the cortical layer.

The intramedullary fixator is installed as follows:

The operation is performed under conduction or intravenous anesthesia.

The upper part of the greater trochanteric and femoral neck is exposed. A hole is drilled along the axis of the bone marrow canal for insertion of an intramedullary blocked rod 1. Holes 7 under the locking screws 3 are drilled into the bones of the lower thigh.

The pointed end of the main part 6 Intramedullary lockable rod 1 through a drilled hole in a large trochanter is introduced into the opening of the medullary canal. Reposition and comparison of the main fragments. Then, on the threaded 5 end 4 of the intramedullary lockable rod 1, screw the nut 2 on the internal thread 10 until the cutting of its external thread 8 into a large skewer. A fine correction is made of the position of the main fragments, slowly introducing nut 2 into the spongy substance of the upper part of the greater trochanter and conduct image intensifier testing to compare the transverse holes 7 in the rod 1 with the main fragments and the largest fragments. Then, also under EOC control, at the level of the main fragments and through the largest fragments, drill holes and screw blocking coils 3 through them, inserting a wide part 11 into the fragment, and with a pointed end 12 into the intended fragment.

During treatment, x-ray control is carried out in 2 projections.

Medical and social effectiveness of the method:

- reduction of rehabilitation periods in view of the preservation of active movements of the lower limb;

- reducing the complexity of the operation due to the simplification of intraoperative reposition of fragments;

- reduction of the total duration of inpatient treatment of patients with diaphyseal comminuted fractures;

- improving the functional results of treatment.

Claims (4)

1. A retainer for intraosseous blocking osteosynthesis, comprising an intramedullary lockable rod made with a thread at one end and with a transverse threaded hole for a blocking screw, a nut screwed onto the threaded end of the rod, characterized in that the diameter of the threaded end of the rod is less than the diameter of its main part, on the outer surface of the nut there is a thread for cutting into the spongy substance, on one end there is a blind transverse groove for screwing in, and on the other there is a blind threaded hole for introducing threads the new end of the rod, while the pitch of the external thread of the nut is greater than the pitch of the inner. 2. The retainer for intraosseous blocking osteosynthesis according to claim 1, characterized in that the diameter of the main part of the intramedullary rod is less than the diameter of the external thread of the nut screwed onto it. 3. The fixator for intraosseous blocking osteosynthesis according to claim 1, characterized in that the intramedullary rod is made tetrahedral. 4. The fixator for intraosseous blocking osteosynthesis according to claim 1, characterized in that the blocking screw is made with two portions of the thread, one of which coincides with the thread of the hole of the blocking rod, and the other with a sharpening of a smaller diameter for insertion of a fragment or main fragment into the cortical layer .