ITAP950001U1 - MODULAR UNIVERSAL EXTERNAL FIXER - Google Patents

Description

MODULAR UNIVERSAL EXTERNAL FIXATOR

TEXT OF THE DESCRIPTION

The system is made up of various elements that can be assembled together, which, by means of a ball joint and a double joint with a flat hinge, allows for multiplanar reduction, distraction, compression and stabilization of different types of bone fractures, as well as the mobilization of large joints during the treatment period.

COMPONENTS DESCRIPTION

The system consists of:

A) 12 mm diameter cylindrical metal bar, 140 mm long with a 12 mm diameter sphere at the end. The bar has a 6 mm rail groove along its entire length.

B) Cylindrical or polyhedral sleeve of 30 mm in diameter by 20 mm of length with countersunk hole of 10 mm on one side and with cylindrical hole of 12 mm on the other. 45 ° inside of the sleeve with respect to the central axis for housing 3 mm6 grains.

C) 12 mm cylindrical metal bar with a diameter of 50 mm long with a flat hinge joint (female) at one end on which 2 8 mm holes are drilled, one through and the other threaded.

D) Male and female flat hinge joint with the same characteristics as letter C to which it is attached by means of an 8 mm long 25 mm bolt.

E) 12 mm diameter cylindrical bar, 90 mm long which has a flattened end with 8 mm central hole for assembly with D by means of a 8 mm long bolt 25 mm.

F) Base clamp composed of various elements:

a- body in the shape of a parallelepiped of 50x40x20 mm. On the upper face (50x40) there are 3 semicircular grooves with a depth of mm2, two at the end and a central one parallel to the 40 mm side. Two 8 mm threaded through holes are drilled in the two spaces between the three grooves. On the side face (20x40) in the anterior marginal seat there is a 12 mm diameter through hole that reaches the opposite face, while in the posterior marginal seat there is a 6 mm threaded through hole. On the front face (50x20) there is a central threaded through hole 12 mm.

b- parallelepiped-shaped mask with dimensions of 50x25x10 mm. On the lower face there are three semicircular grooves identical to those of the body. On the upper face in the two spaces between the three grooves there are two unthreaded 8 mm through holes.

c- n. 2 mm8 bolts, 25 mm long

d- n. 1 mm12 dowel 20 mm long which is reduced at the end by 4 mm of length with cylindrical section of mm6.

T-clamp composed of various elements:

a- parallelepiped-shaped body with dimensions of 50x40x20 mm. On the upper face there are three grooves and two threaded pass-through holes identical to those of the body of the base clamp referred to in letter Fa. In front of each threaded hole there is a 12 mm pass-through hole On the side face (40x20) at the front there is a threaded through hole of 12 mm. On the lower face in the central seat at the front there is a threaded hole of 6 mm.

b- parallelepiped-shaped mask with dimensions of 50x25x10 mm On the lower face there are 3 semicircular grooves identical to those of the body. On the upper face in the spaces between the 3 grooves there are 2 unthreaded 8 mm through holes.

In front of each of these holes, there is a hole for

3/4 of a circumference of 12 mm in diameter. There is a threaded hole of 6 mm behind and centrally.

c- 2 bolts 8 mm long 25 mm.

d- 1 grain 12 mm long 20 mm.

H) Joint clamp consisting of:

a- a parallelepiped-shaped monobloc base element with dimensions of 20x20x70 mm. On the front face there are 4 through holes equidistant from mm6. On the lower face in correspondence with the holes of the front face there are 4 threaded holes of 8 mm. The upper face in correspondence with the third through hole has a protruding element of 20x20 mm rounded at the top with a smooth central through hole of 8 mm.

b- 4 bolts 8 mm in diameter by 10 mm in length,

c- 1 bolt 8 mm long 30 mm with relative nut.

1Accessory clamp with compression-distraction function consisting of: a- a parallelepiped-shaped monobloc base element with dimensions of 50x25x20 mm which has a full-thickness recess of 10x20 mm on its upper face (50x25) which reaches the lower face. On the opposite edge of the upper face there is a through hole of 6 mm smooth for 9 mm and threaded for the remaining 10 mm. On the side face (50x25) there is an 8 mm smooth through hole at the front. At the rear there is a 12 mm smooth through hole. On the front face (25x20) there is a groove parallel to the 25 mm side in the center which reaches the 12 mm through hole.

b- 1 bolt 6 mm in diameter by 20 mm in length,

c- 1 bolt 8 mm, 80 mm long threaded, which has a reduction in caliber to 6 mm for the initial 15 mm,

d- 1 nut 6 mm.

and- 1 threaded washer with dimensions of 18 mm by 8 mm of thickness with central threaded hole of 8 mm. Peripherally there are 4 blind holes of 4 mm equidistant

OPERATION

The system is used in the reduction and closed stabilization of displaced and unexposed fractures, exposed or not, of all skeletal areas even with joint involvement. self-perforating or not, depending on the skeletal segment involved, which must be positioned proximal and distal to the fracture site to be stabilized.

Either two base clamps or two T clamps, or a base clamp and a T clamp, or a base clamp and an articular clamp can be assembled on the bars of the fixator, which constitute the load-bearing element of the system, depending on the type of fracture. .

Once the fixator has been assembled with the suitable clamps, the fixator is solidified to the chips previously implanted on the bone,

the fracture focus is reduced and locked first on the frontal plane using the ball joint and then on the sagittal plane using the flat hinge joint.

STADIUM OF TECHNIQUE

Currently there are numerous other more or less complex or articulated external fixation systems.

Claims (1)

CLAIMS Simple, versatile system, applicable on different skeletal areas (humerus, femur, tibia, ankle, pelvis), easily achievable, low cost and easy to use and manage. The possibility of stabilizing and fixing the correction obtained in the frontal plane by means of the ball joint and the certainty of not losing said correction during reduction in the sagittal plane using the double joint with flat hinge appears to be the fundamental element of this type of external fixator, not thus simply obtainable at present with the various other types of external fixators. Another fundamental feature is the possibility of locking large joints (e.g. ankle) in ligamentotaxis for the period of time deemed appropriate and the subsequent possibility of starting early mobilization by releasing the joint clamp bolt located in the center of rotation of the ankle.