BAROUK SCREW PDF
FRSÃ¢Â„Â¢ SCREW FOREFOOT RECONSTRUCTION SYSTEM – Biomet · · FRSÃ‚Â® Fusion and Reconstruction System Standard Staple. BAROUK Screw Developed by yntheses of small bones / fragments Threaded head can be countersunk. S.1 This easy to use fixation device has been. 2 Contents BAROUK Screw 2 FRS Screw 3 TWISTOFF Screw 4 MEMORY 12 and 20 Staples 5 VARISATION Staple 6 BAROUK Screw Surgical Technique 7.
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A self-compressive and atraumatic osteosynthesis screw, includes a threaded proximal head, a body forming a threaded distal portion and, between the head and the distal part, a smooth section of short length relatively to the distal portion length, the threading thereof having a greater pitch than that of the proximal head threading, and a longitudinal channel provided from one end to the other of the screw to receive a guide pin.
The screw includes a mechanism enabling it to fix small bones or small bone fragments of the skeleton after an osteotomy or a fracture, and in particular one of the five metatarsals of a human foot, including a threading diameter of the distal portion slightly greater than the diameter of the thread root of the proximal head and the diameter of the channel ranges between about 0.
The present invention relates to a self-compressing and atraumatic osteosynthesis screw for surgery of small bones or of small bone fragments, in particular those of the foot. French Patent 2, 94 08 describes a Barouk screw comprising a threaded proximal head, a body forming a threaded distal part and, between the head and the distal part, a smooth section whose length is short compared to the length of the distal part.
The threading of the latter has a pitch greater than that of the threading of the proximal head, and a longitudinal channel is arranged from one end to the other of the body of the screw in order to receive a guide pin.
The difference between the pitches of the two threadings causes a compression of the two bone fragments on one another during screwing. This is because the diameter of the threaded head of this screw at the threading root is very nearly 3 mm.
mm Headless Compression Screw | DePuy Synthes Companies
For smaller bones such as the other four metatarsals, when carrying out an osteotomy described by Dr Weil to correct an excess length of these metatarsals, it is necessary to use a screw of reduced dimensions such as the one described in French Patent No.
Such a screw is continued via an endpiece which breaks off automatically by virtue of a break line formed between the head of the screw and the base of the endpiece. The reduction in the diameter of this separable screw is obtained by virtue of the fact that it dcrew not have a longitudinal channel running through for guiding a pin. None of these prior art screws can be used universally for osteotomy or fixation of fractures of small bones, in particular the metatarsals. This is barluk the screw according to U.
If the bone of these wcrew lateral metatarsals is porotic, the screw with the break-off endpiece can prove too small and its hold inadequate. Likewise, if the first metatarsal is actually small in size, as is the case in some patients, the cannulated screw with sccrew head sscrew to the aforementioned patent risks rupturing it. It is an object of the invention to make available an osteosynthesis screw of the abovementioned type, for surgery of small bones or small bone fragments, which can be used in place of the two known screws discussed above, not only for scres one of the five metatarsals, but also for osteotomies of small bones or small bone fragments, and for fixation of fractures in applications other than surgery of the foot, for example for bones of the hand.
According baroyk the invention, the self-compressing sceew atraumatic osteosynthesis screw includes means allowing it to fix the small bones or small bone fragments of the skeleton scrw an osteotomy or a fracture, and in particular any one of the five metatarsals of a human foot.
Thus, the screw according to the invention advantageously replaces the two screws—the cannulated one and the separable one—of the prior art set out above. According to one embodiment of the invention, said means comprise a diameter of the threading of the distal part slightly greater than the diameter of the root of the threading of the proximal head, and the fact that the diameter of the channel is between 0.
This therefore results in a miniaturization of the prior art screws while at the same time maintaining the scre of a longitudinal channel opening out at both ends of the screw, which allows it to be guided into place using a pin. The diameter of the root of the threading of the proximal head is approximately 2. A screw is thus obtained whose dimensions are sufficiently reduced in relation to the screw according to French Patent 2, to allow it to be used in osteotomies or fixation of fractures of small bones such as the middle metatarsals without any risk of barou, these bones to break, and at the same time the screw retains sufficient strength to resist the stresses experienced during scrwe period of use.
Other particular features and advantages of the invention will become apparent from the following description in which reference is made to the attached drawings which show an embodiment thereof as a nonlimiting example. The osteosynthesis screw  1 for surgery of small bones or small bone fragments which is represented in FIGS.
Formed between the head 2 and the distal part 5 there is a smooth section 6 whose length is short compared to that of the distal part 5.
The threading  7 of the latter has a pitch p 1 which is greater than the pitch p 2 of the threading 3 of the baoruk head 2. A longitudinal channel 8 is arranged axially from one end to the other of the screw 1 and opens out at both its opposite ends, this channel 8 being intended to receive a guide pin not shown.
Two self-cutting recesses 9 are arranged at the distal end of the part 5. In the head 2the axial channel 8 widens out to delimit a seat 11 whose wall constitutes a hexagonal recess 12 adapted to receive a corresponding screwing instrument not shown. The external diameter d  1 of the threading 7 of the distal part 5 is slightly greater than the diameter d 2 of the root 10 of the threading 3 of the head 2.
For this reason, given the height of the threads of the threading 3the external diameter d 3 thereof can be of the order of for example 3. This external diameter d 3 of 3.
The threading  3 has a maximum depth sufficient to ensure satisfactory bone attachment without otherwise reaching the wall of the hexagonal recess The fact that the crest of the distal threading  7 has a diameter d 1 scarcely greater than the diameter d 2 of the root of the threading 3 prevents this distal threading from damaging the entry to the hole in the bone.
This is because, in the opposite case, the proximal threading 3 would interfere with the distal cutting of different pitch, which is obviously undesirable for obtaining satisfactory bone anchoring. If, for example, the external diameter d  1 of the distal threading 7 is 2. This low value of engagement of the threading 3 substantially prevents damage to the bone. Baouk should also be noted that the external diameter d 1 of the distal threading 7 cannot be made bariuk small, otherwise it would screa ensure sufficient bone attachment.
It has also been found that the best results concerning recesses with different profiles are obtained with a hexagonal profile of the wall  12and a distance e between two opposite faces 12 a of the hexagonal wall 12 scrdw between about 1.
With such a recess, combined with a cannulated screwdriver with a diameter for example of 0. Trials have established that the external diameter d  1 of the distal threading 7 must be between 2.
The length of the screw is between 10 and 22 mm. It covers all morphotypes and largely corresponds to the different thicknesses of the metatarsals.
The following table contains an example of the characteristics of a prior art Barouk screw and an embodiment of the self-compressing and atraumatic screw  1 according to the invention. It will be seen that all the dimensions of the screw according to the invention are substantially reduced.
Despite this reduction in dimensions, the tear-out force and the torsional moment of the screw remain far greater than those of a separable or twist-off screw having a head with the same external diameter. Of the five metatarsals  13 and 14the first metatarsal 14 is deformed in the medial direction arrow F 3 and position 14 a indicated by broken screconstituting metatarsus varus. In a subsequent step, the surgeon displaces the lower bone fragment  acrew b laterally, that is to say toward the metatarsals The surgeon then inserts fixation screws 1 in order to firmly close and compress the two bone fragments 14 b and 14 c on one another.
Finally, the surgeon partially cuts the bone part 17 which forms a medial protrusion relative to the bone fragment 14 b. In this application, the screw 1 is used to fix the plantar bariuk 13 b of a metatarsal 13 which has first been cut longitudinally into two parts 13 a and 13 b and brought to the desired position. The pitch of the screws  1 is of the order screew 1 mm, substantially equal to that of the larger Barouk screws of the prior art.
This increases the hold of the screw in the bone, scgew is often porotic or of small size. The screw can be made of any suitable biocompatible material, such as a titanium alloy.
Self-compressing and atraumatic osteosynthesis screw 1comprising a threaded proximal head 2a body 4 forming a threaded distal part 5 and, between the head and the distal part, a smooth section 6 whose length is short compared to the length of the distal part, the threading 7 of the latter having a pitch greater than that of the threading 3 of the proximal head, and a longitudinal channel 8 arranged from one end to, the other of said screw in order to receive a guide pin, characterized in that it includes means allowing it to fix the small bones or small bone fragments of the skeleton after an osteotomy or a fracture, and in particular any one of the five metatarsals 1314 of a human foot.
Screw according to claim 1characterized in that said means comprise a diameter d 1 of the threading 7 of the distal part 5 slightly greater than the diameter d 2 of the root of the threading 3 of the proximal head 2and the fact that the diameter of the channel 8 is between 0. Screw according to claim 1 or 2characterized in that a recess with a hexagonal wall 12 is formed in the proximal head 2 for a screwing instrument, and the distance e between two opposite faces 12 a of this recess is approximately 1.
Cannulated Screw System
Screw according to one of claims 1 to 3characterized in that the external diameter d 1 of the threading 7 of the distal part 5 is between 2. US USA1 en System, device, composition and method for treating and preventing avascular or osteonecrosis.
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