FR2718200A1 - Stabilised pin for insertion into fractured bones during surgery - Google Patents

Abstract

The pin for insertion into long bones in animal or human surgery consists of a bar (1) with a star cross section (2). The bar may be solid or hollow in the centre (3), straight or curved. The lower end is tapered (4), the upper end is in the form of a cone (5) with a cylindrical part threaded (6) to receive an expanding nut (7) and that is unable to retract. The expanding nut (7) has a cylindrical or conical form (8) threaded with an "artillery pitch" form (9). One end is slotted for a screwdriver blade (10) and its central hole (11) is threaded for screwing onto the end of the bar. At the other end is a conical hole (12) with peripheral slots (13) for the formation of the expanding blades (14).

Description

 The present insertion is intended for human surgery for the treatment of fractured limbs, it can also be used in the veterinary field.

 In the case of fractures, to keep the bone in alignment, during the physiotherapy dc ccnsol daticr cvac a fixation which makes the interfaces stable and does not allow the fragments to rotate. Various methods are used: screwed plates, pins, nails, etc.

 Our idea is to place in the center of the bone a nail or a bar with a stable system of non-return and simple, precise and fast installation.

 It is ap; Ilicable to all long bones: tibia femur, radius etc ... of the human ccrps or in all the applications, the legs of animals etc ...

 The materials used are compatible with the human body and must comply with current standards.

BAR
Its shape consists of a star-shaped outer bar (1) whose nominal diameter is in relation to the bone to be treated.

 Its length is variable in order to adapt as closely as possible to the human anatomy.

 The number of spokes (2) is variable depending on the nominal diameter.

 The bar may be full or hollow (3), straight or curved according to the long bones to be treated and it must be in accordance with human or animal anatomy.

 The lower end (4) is tapered to facilitate penetration into the bone, the edges may be sharp or foamed.

 The upper end has a conical part (5) surmounted by a cylindrical part (6) threaded to receive an expansive anti-recoil nut (7).

 This threaded cylindrical part will be used for positioning the bar by adapting an impact instrument to it and also for its removal.

ECRCU:
Of cylindrical or conical shape (7) on the outside with a thread (8) "artillery type" (anti-recoil).

 In its upper part a hexagonal imprint (9) to receive a suitable screwdriver.

 In its lower part and on the periphery several slots (10) along the axes and opening out across the center thus creating lamellae.

 The center of the plug has a threaded hole (11) in connection with the threaded cylindrical part (6) of the bar, the lower end of the barter cone shape (12).

 When screwing the plug (8) on the bar (1) the cone (12) will adapt to the cone (5) of the bar while continuing the screwing, the cone of the bar (5) will force the expansion of the parts of the nut thus the lower diameter of the plug will increase its nominal diameter.

A perfectly stahle anchoring in the bone will be achieved.

 The bar / plug assembly thus mounted will maintain the bone in alignment during the entire phase of bone consolidation and no migration will be feared.

 Subsequent removal of the assembly will remain easy for the surgeon.

 Fig 1 is an elevation showing the nail with a VIEW at the top.

 Fig 2 is a sectional elevation of the anti-kickback nut.

 Fig 3 shows a diagram showing the placement of the nail according to the invention in a long bone.

 By unscrewing the stopper the nominal diameter will return to its original position, the stopper will be completely removed, a percussion instrument will adapt by screwing on the cylindrical part threaded with small coLps of the instrument, the nail will recede and the ablatior will become total.

Claims (2)

CLAIM  1- Nail with anti-recoil system to be included in long bones, characterized because it consists of an element in the form of a bar (1) with a starry exterior (2) in relation to the size of the bone to be treated. The bar may be solid or hollow (3), straight or curved, the lower end is tapered (4), the cone-shaped extremisuperium (5) with a threaded cylindrical part (6) receiving an expansive nut (7 ) anti recoil 1.  2- The expanding nut (7) anti-recoil of cylindrical (8) or conical shape having at its outer part a PEE of "Artillery type" screws (9). At one end an imprint for a suitable screwdriver (10) (Héxagoral OL other) with a tapped hole (11) in its center. At the other end, a conical hole (12) with peripheral slots (13) for forming lamellae (14).