Surgery – Instruments – Orthopedic instrumentation
Patent
1992-11-04
1994-04-05
Pellegrino, Stephen C.
Surgery
Instruments
Orthopedic instrumentation
606 96, A61B 1756
Patent
active
053000722
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an element for universal distal securement, particularly for the external protection of the distal end of a pin adapted in particular for a finger of the hand but not exclusively for this latter.
BACKGROUND OF THE INVENTION
Distal pins used currently in surgery of the hand for the consolidation of the joints have diameters from 0.8 mm to 3 mm in steps of 0.2 mm to 0.5 mm. There exists, for protecting the end of this pin, in the external portion, a distal securement element in the form of a ball of plastic material resisting autoclaving. This ball is pierced diametrically by a hole permitting the passage of distal pins of similar diameters. For example, a distal securement element whose bore is 1.2 mm in diameter can receive pins that are 0.8 mm, 1.00 mm and 1.2 mm. For larger diameters, the exterior diameter of the ball will be greater. All these existing distal securement elements are pierced in the equatorial plane with a tapped hole in which the screwing action of a screw driver on a headless screw applies point pressure to the pin inserted in the element, such that this element will thus be fixed in rotation and in translation on the pin, thus preventing the latter from drifting relative to the hand, or relative to any other part of the body in which this pin might be implanted.
The distal securement element facilitates by its shape the treatment in dressing the wound, it thus makes it unnecessary for a surgeon to bend by 90 degrees the distal pin as was the case before this distal securement element.
To permit use of a securement element of this type for all diameters of existing pins, it has been proposed (French 2,633,822) to provide the securement element with orthogonal bores at the crossing of which opens the tapped hole of the clamping screw. This known arrangement is difficult to use by the physician, who must choose the bore corresponding to the pin which he has emplaced. Moreover, the unused bore constitutes a receptacle for organic products and organisms which are dangerous for the adjacent wound.
SUMMARY OF THE INVENTION
The present invention overcomes these drawbacks of the securement device known from French 2,633,822, thanks to a new device adaptable immediately to all diameters of existing pins which has no open bore after its emplacement.
To this end, the invention has for its object a universal distal securement element for surgical pins of all diameters used, of the type comprising a protective sphere provided with a bore for a pin and a clamping screw disposed in the tapped hole which opens into said bore, characterized in that it comprises an insert that is elastically deformable by means of said clamping screw and coming into contact with at least one generatrix of the pin to be protected, the deformable insert being in the shape of a crescent whose length of concave arc is approximately equal to the length of the circumference of the smallest usable pin, the radius before deformation corresponding to the radius of the largest diameter permissible pin.
The securement element according to the invention thus permits a simple and certain adaptation to all diameters of pins, with a single bore for the different pins. The elasticity of the insert causes it to return to disengagement position upon unscrewing the screw.
According to a preferred embodiment of the invention, the two ends of the deformable insert in the shape of a crescent are superposed in the active region of the clamping screw.
Preferably, said bore has a section greater than that of the pin of greatest section, the through bore being formed by a portion of the bore of circular section corresponding to that of the pin of greatest diameter, to which is connected the portion of an axially parallel bore whose section corresponds to that of the pin of smallest diameter. Preferably, the bore of largest diameter is closed at one end by a thin wall pierced in prolongation of the bore of smallest diameter, the bore of greatest diameter communicating with a diametrical recess
REFERENCES:
patent: 2346346 (1944-04-01), Anderson
patent: 2398915 (1946-04-01), Bell
patent: 3916748 (1975-11-01), Lee
patent: 4244360 (1981-01-01), Dohogne
patent: 4271832 (1981-06-01), Evans et al.
patent: 4312101 (1982-01-01), Oetiker
Pellegrino Stephen C.
Tucker Guy V.
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