US 8,409,201 B2Granted

Percutaneous patellar osteosynthesis system applicable to dislocated patella fractures

AssigneeJose Adan Ortega Blanco

InventorDaniel Luna Pizarro

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Abstract

The present invention relates to a percutaneous patellar osteosynthesis system applicable to any type of fracture of the knee cap, formed by two arms that contain two multidirectional movable securing devices for fitting to any type of knee cap, in which the arms close in a parallel manner by means of a scissors closure mechanism in order to keep the fragments confined and secured by means of a “zipper” based on manual compression. The devices for securing the knee cap have antero-posterior, up/down and also lateral mobility in order to mobilize the fractured fragments and to achieve a reduction and a satisfactory knee cap joint congruence. The arms have slidable guides for placing the implant in any required direction in order to keep the fragments stable, the guides slide on the arms and the parallelism sought in this type of fixing is achieved without having to be based on manual calculation, the latter customarily being used in broad tissue dissection. The system achieves reduction and internal fixing by means of a minimally invasive technique and less tissue damage. The system also has guides for fitting cerclage wiring on an implant of any configuration, facilitating reduction and fixing of patellar fractures and the taking of X-rays with the system in place.

Claims16

Dependent claims

A system for fixation of bone fractures, comprising:

a securing portion for percutaneously securing fractured bone segments, the securing portion having first and second arms that extend in a parallel relationship with each other and are separated from each other by a distance, the securing portion having securing members that extend from the first and second arms and, when in use, engage and stabilize the bone segments;
and
a compression portion, coupled to the securing portion at a pivot joint, that adjusts the distance between the securing portion first and second arms, comprising
a first arm rotationally coupled to one of the two parallel arms, the first arm having a longitudinal axis from a first end portion to a second end portion and a slot along the longitudinal axis;
a second arm rotationally coupled to the other of the two parallel arms, the second arm having a longitudinal axis from a first end portion to a second end portion and a slot along the longitudinal axis;
and
a pair of guide members, each having a first end that adjustably resides within the first arm slot and a second end that adjustably resides within the second arm slot, the pair of guide members being coupled to each other and rotatable about a common axis when the guide member first ends or second ends are adjusted within the first or second arm slots;
wherein the pair of guide members maintains a parallel relationship between the compression portion first and second arms and between the securing portion first and second arms when the distance between the securing portion first and second arms is changed;
and
wherein the securing portion extends substantially in a first plane and the compression portion extends substantially in a second plane, and wherein the securing portion is pivotable relative to the compression portion about an axis of the pivot joint such that the first plane is transverse to the second plane.

7 more elements

A system for securing a fractured patella, comprising:

a first arm having a securing portion and a compression portion, the securing and compression portions being rotatable relative to each other about a first joint axis, the first arm compression portion having a longitudinal axis from a first end portion to a second end portion and a slot along the longitudinal axis;
a second arm having a securing portion and a compression portion, the securing and compression portions being rotatable relative to each other about a second joint axis, the second arm compression portion having a longitudinal axis from a first end portion to a second end portion and a slot along the longitudinal axis, the second arm being separated from the first arm by a distance;
a plurality of securing members extending from the securing portion of at least one of the first and second arms toward the other of the first and second arms, each of the securing members being coupled to the securing portion at one end and a second end being cantilevered between the first and second arms, such that, when in use, the second end is configured to engage and stabilize the patella between the first and second arms;
and
a pair of guide members coupled to the first and second arms and that maintain a parallel relationship between the first and second arms when the distance between the first and second arms is changed, the guide members each having a first and second end, wherein the first ends each reside within the first arm slot and the second ends each reside within the second arm slot, the guide members being rotatable relative to each other about an axis;
wherein the securing and compression portions of the first arm extend in a first plane, the securing and compression portions of the second arm extend in a second plane, the first and second planes being substantially parallel, and the first and second joint axes being substantially coaxial.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/300,458Filed 21 May 2007
Priority: MX PA/A/2006/00725122 Jun 2006
Published: US 2009/0216230 A127 Aug 2009
Granted: 2 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

A61B 17/82
Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin: for bone cerclage
A61B 17/66
For external osteosynthesis, e.g. distractors, contractors: alignment, compression or distraction mechanisms
A61B
Medical diagnosis and surgery