CN2036410U - External skeletal fixation device for tibia - Google Patents

Abstract

The utility model relates to an external skeletal fixation device for tibia, comprising a herringbone strap clamp, a universal joint, a ball head bolt, and a straight strap clamp. When the utility model is used, the herringbone strap clamp is fixed on the broken bone, the straight strap clamp is fixed under the broken bone, and a further reset adjustment is made under an X-ray machine. With a universal joint and a ball head bolt, the skeletal fixation can be adjusted to any angles, the distance between the two broken bones can be braced and compressed by the skeletal fixation, and the breach is thoroughly anastomosed. The utility model has the advantages of simple manufacture, and convenient operation, can reduce the pain of the patient.

Description

External skeletal fixation device for tibia

This utility model relates to a kind of medical apparatus and instruments, specifically, is the external fixator that fracture of tibia is used.

The doctor generally is earlier knochenbruch to be resetted in order to treat fracture patient, and external fixation or internal fixation are implemented in the back.The external fixator that uses all is that the plane is fixed now.Promptly earlier knochenbruch is resetted,, insert draw point, penetrate skeleton and fixed from same direction then by the pin hole on the external fixator.This method is to reset earlier, after wear draw point.The knochenbruch that has resetted is deformed.In order to correct, the doctor has to extract draw point, resets once more.This brings very big misery to patient.Moreover owing to adopt the plane to fix, draw point can only pierce into skeleton from a direction, and anti-rotation resists to become to wrestle inequality, is easy to generate deformity in therapeutic process.

One of the purpose of this utility model is a kind of new outer fixture of development, after penetrating draw point, can do further adjustment, make two of fracture save the rotation that skeleton can be made any direction, can also strut arbitrarily, compress the distance between two knochenbruch, make each orientation of knochenbruch can both be fully identical.Two of purpose is the stability that strengthens the back knochenbruch that resets, and the knochenbruch after avoiding coincideing produces displacement and deformity again.

This utility model is realized penetrating and also can be done after the draw point further to adjust by add universal joint and ball stud on holder; By using " herringbone " clamp and " in-line ", the clamp way of combining makes draw point penetrate skeleton from three different directions, strengthens the stability of the back knochenbruch that resets, and the back knochenbruch of avoiding coincideing produces displacement and deformity again.

This utility model is by " herringbone " clamp, universal joint, and ball stud, " in-line " clamp and nut, parts such as screw are formed.The angle and the shank appearance of " herringbone " clamp are identical substantially.Respectively there is a cylindrical pin hole on the both sides of " herringbone " clamp, penetrate skeleton so that draw point can pass clamp.One to two and the vertical screwed hole of cylindrical needle axially bored line are arranged on the cylindrical wall of cylindrical pin hole, so that be screwed into screw, fastening draw point.A cylindrical hole is arranged at the top of " herringbone " clamp, and an end in hole has female thread, and there is a concave spherical surface at the middle part in hole, and the other end in hole is a less cylindrical hole.Universal joint is a cylinder, the screw thread of cylindrical matches with the female thread of " herringbone " clamp top cylindrical hole, one end of universal joint has a square step, be convenient to spanner turn universal joint, the other end of universal joint have one identical with " herringbone " clamp top cylindrical hole middle part concave spherical surface radius, the concave spherical surface that direction is opposite.One end of ball stud has a spheroid that radius is identical with concave spherical surface on the universal joint, and other end cylindrical is threaded, and threaded section has a keyway with the bolt axially parallel." in-line " clamp is a cuboid, Yi Bian be a plane, an end of another side has a cylinder ring that axis is parallel with the clamp length direction, and the endoporus of ring has a key that matches with keyway on the ball stud.Also have on " in-line " clamp two with the vertical cylindrical pin hole in clamp plane, one to two and the vertical screwed hole of cylinder axis are arranged on the wall of cylindrical pin hole so that be screwed into screw, fastening draw point.

During installation, threaded end with ball stud (3), insert from " herringbone " clamp (1) top cylindrical hole threaded end, the concave spherical surface (9) in bulb and stage casing, post hole, garden is coincide, from the cylindrical hole female thread of " herringbone " clamp top, be screwed into universal joint (2) again and make between the bulb (16) of the concave spherical surface (15) of universal joint and ball stud certain interval is arranged.Be screwed into the end of thread of a nut (4), and be screwed to, again ball stud (3) is inserted in the band key cylinder ring endoporus (12) of " in-line " clamp one end near screw tip from ball stud (3).Because the key (13) of cylinder ring endoporus (12) is in the keyway (17) of ball stud, ball stud just no longer rotates in the cylinder ring endoporus.The end of thread from ball stud is screwed into another nut (6) again.At this moment " herringbone " clamp, universal joint, ball stud, " in-line " clamp just is linked to be an integral body.The tibia external fixator of the new shape indication of this practicality just.

During use, earlier knochenbruch is resetted, then " the herringbone clamp places the knochenbruch top; " in-line " clamp places the knochenbruch below; breach is placed on two clamps in the middle of immediate two pin holes, penetrate skeleton with draw point from each pin hole, and it is fastening with draw point to turn the pin hole screwing.Again under X-ray machine, to the knochenbruch adjustment that further resets.Reset when adjusting, strut if desired or compress distance between two knochenbruch, on the scalable ball stud in two nuts one, regulate suitably after, tighten another again, fixed.When needing to adjust the angle between two knochenbruch, because universal joint is to contact with the bulb of ball stud by concave spherical surface, and ball stud has been linked to be an integral body with " in-line " clamp, so can rotate at any angle between " herringbone " clamp and " in-line " clamp.Therefore, can do any adjustment between two knochenbruch, and not need to wear again draw point, thereby reduce patient's misery.Adjust between two knochenbruch fully identical after, tighten universal joint, the angle between two knochenbruch just can not change again.Because draw point penetrates skeleton from three directions, thus stable very strong, fixing once adjusting, just can not produce displacement and deformity.

Below accompanying drawing is illustrated

Accompanying drawing 1 is the assembling sketch map of tibia external fixator.

Accompanying drawing 2-a is that the master of " herringbone " clamp looks sketch map.

Accompanying drawing 2-b is the schematic top plan view of " herringbone " clamp.

Accompanying drawing 2-c is the schematic side view of " herringbone " clamp.

Accompanying drawing 3-a is that the master of " in-line " clamp looks sketch map.

Accompanying drawing 3-b is the schematic side view of " in-line " clamp.

Accompanying drawing 4 is universal joint sketch maps.

Accompanying drawing 5 is ball stud sketch maps.

Among the figure, 1 " herringbone " clamp, 2 universal joints, 3 ball studs, 4 nuts, 5 " in-line " clamp, 6, nut, 7 screws, 8 pin holes, 9 concave spherical surfaces, 10 pin holes, 11 screws, 12 band key cylinder ring endoporus, 13 keys, 14 square steps, 15 universal joint concave spherical surfaces, 16 bulbs, 17 keyways.

Below in conjunction with accompanying drawing, a non-limiting examples is described further.

The thickness of " herringbone " clamp (1) is 6(unit: millimeter, down together) angle is 90 °, the pin hole on both sides (8) is that φ 4, screw 7 are M3, " herringbone " clamp top cylindrical hole middle part concave spherical surface (9) radius is 8, ball stud (3) length is 80, bulb (16) radius is 8, external screw thread is that M10, keyway (17) widely are 3, are 2 deeply, universal joint (2) external screw thread is M20, square step (14) is 16 * 16 * 5, concave spherical surface (15) radius is 8, in-line clamp (5) length is 80, wide is 25, and thick is 6.Band key cylinder ring endoporus (12) is φ 12, and key (13) is wide to be 3, and nut (4) and (6) all are M10.

All material is made with rustless steel.

The utility model is used for the fixed tibial fracture, can make breaking part fully identical, only need once wear draw point, can avoid repeatedly suffer of patient. The stability of fixing fracture is strong, and the knochenbruch behind the reseting anastomotic can not produce displacement, deformity.

Claims (1)

1, a kind of tibia external fixator, by the herringbone clamp, universal joint, ball stud, the in-line clamp is formed, and it is characterized in that:

1. the herringbone clamp has the pin hole of two different directions, can penetrate skeleton from different directions for draw point; But its top has female thread and the circular hole with concave spherical surface of a permanent universal joint;

2. universal joint has external screw thread, the square boss and a concave spherical surface that can supply the turn universal joint;

3. ball stud have one with 1., 2. in the spheroid that matches of said concave spherical surface, one section external screw thread and one and thread segment are with keyway long, that be parallel to the bolt axis;

4. the in-line clamp has the cylinder ring of a more than one pin hole and an interior pore area key.

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