Ascending centromedullary thigh bone pin with mechanical clampin

Details Ascending centromedullary thigh bone pin with mechanical clampin Ascending centromedullary thigh bone pin with mechanical clampin

1998-10-23

2000-06-27

Buiz, Michael

Surgery

Instruments

Orthopedic instrumentation

606 98, A61B 1772

Patent

active

06080159&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a so-called ascending centro-medullary nail (i.e., the point of its introduction is located in the knee joint), which is fixated in the distal epiphysis of the femur by a mechanical method, and fixated at the level of the proximal metaphysis of the femur by mechanical means as well, as described further below.
2. The Prior Art
Said nail is intended for generally treating fractures located at the 1/3 distal level of the femur, specifically
In the most favorable case, centro-medullary pinning--whether fixated or not--interlocks at least two fragments of equal length (1). If the or one of the lines of fracture extends close to an epiphysis, the best mechanical solution is to introduce the nail within the proximity or the epiphysis involved (2). On the other hand, the nail, due to its long centro-medullary extension in the largest of the fragments, automatically orientates the shorter of the two fragments.
Taking into account the above procedures, surgeons heretofore made use or the trochanteric method depending on the location of the line of fracture of the femur. Due to the nature of this approach, which is not very satisfactory, surgeons often fail with the pinning for securing the plates bent most often (3) in support of the epiphysis; in fact, conventional pinning, even if interlocked, is exposed to the following risks:
(1) The mechanical advantages of catheterizing first the shortest fragment of the femur are obvious.
(2) The nail may end in one of the condyles, which interferes with the reduction and may lead to severe callosity.
(3) The epiphyseal corner lines may become enlarged and the more or less identified fragments may be mobilized.
(4) The distal fixation is radioscopic, which is a source causing problems and irritation for medical and paramedical personnel.
On the other hand, resorting to the plate, which is viewed as being indispensable, is not an ideal solution. In fact, it acts as an intervention with the open roof extensively, and as such is a source of bleeding due to postoperative infection and difficult healing.


SUMMARY OF THE INVENTION

The objective of the present innovation is to permit a centro-medullary fixation interlocked in the closed center without the drawbacks of the conventional pinning specified above, but with the following advantages: material, providing the surgeon with


BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is explained by the attached drawings, in which:
FIG. 1 shows a conventional centro-medullary pinning of the femur, interlocking two diaphyseal fragments of equal length;
FIG. 2 shows a conventional centro-medullary pinning interlocking two fragments of unequal length. The assembly is satisfactory, as the line of fracture is close to the trochanteric point of introduction of the nail;
FIG. 3 shows an angled plate interlocking the two main fragments of the femoral fracture in the distal 1/3rd part of the femur. For various reasons outlined in the following, introduction of a centro-medullary nail at a trochanteric point is not satisfactory;
FIG. 4 shows the profile of an ascending centro-medullary nail, the latter being curved in the sagittal plane;
FIG. 5 shows a front view of the ascending nail;
FIG. 6 shows the assembled fixation comprised of the ascending nail, adapter and universal guide;
FIG. 7 show the variable position of the subtrochanteric fixation adaptable to the length of the femur when the use of only a very limited number of nails is deemed desirable;
FIG. 8 show the articulation of the perforator-guide and nail;
FIG. 9 shows the assembly of the fixation comprised of nail, perforator-guide and universal guide; and
FIG. 10 shows a complete assembly of the interlocking intramedullary nail system of the present invention.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS



MATERIAL

The nail (4,5) is a fully cylindrical pin adapted to the shape of the medullary canal in that it is curved in the sagittal plane (FIG. 4). The nail is pierced by two locking aper

REFERENCES:
patent: 2821979 (1958-02-01), Cameron
patent: 4622959 (1986-11-01), Marcus
patent: 5179915 (1993-01-01), Cohen et al.
patent: 5248313 (1993-09-01), Greene et al.

Affiliated with

Also associated with

Rating

Ascending centromedullary thigh bone pin with mechanical clampin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ascending centromedullary thigh bone pin with mechanical clampin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ascending centromedullary thigh bone pin with mechanical clampin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1780392