Surgery – Truss – Perineal
Patent
1987-05-06
1989-05-09
Truluck, Dalton L.
Surgery
Truss
Perineal
128 92ZW, 402116, A61B 1718
Patent
active
048279188
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a fixing instrument which is intended to secure two vertebrae in position relative to each other also in cases when one or several vertebrae remain unfixed between said vertebrae.
More specifically the invention refers to fixing instruments which include two support members which are so connected to each other by means of a screw spindle that they will move towards each other when the screw spindle is rotated in one direction and away from each other when the screw spindle is rotated in the opposite direction and where each of said support members is pivoted to a securing member which is provided to be secured to a vertebrae at least by means of a screw provided to pass through an opening in said securing member.
In instruments of the kind referred to it is of utmost importance that every adjustment can be secured rapidly and effectively and for such a purpose special locking or fixing constructions are used.
A serious drawback of the instruments referred to and now on the market is that said constructions are so designed that the surgeon has to work from various directions and also deep in the body of the patient. In order to lock the securing members in place relative to the members bolts with nuts are used which makes it necessary to operate one wrench at the front side of the instrument and one at the back side thereof. The screw spindle is further threaded in both ends which means that also in this respect the surgeon has to operate two wrenches, one at each end of the instrument. It is self-explanatory that such an operation is time consuming and troublesome and that the encroachment in the back of the patient has to be unnecessarily extensive. The constructions known in the art further--in spite of a complicated structure--lack sufficient security and effectiveness, partly upon the fact that they have an unsatisfactory stability as refers to turning.
Thus, the primary object of the invention has been to provide a simple and sturdy instrument of the kind referred to, by means of which a safe and effective fixing is obtained and which is designed so as to make it possible for the surgeon to accomplish the necessary lockings from one single position and in a very simple manner, i.e. by tightening screws or similar fastening elements, at the same time offering the advantage of a reduced encroachment in the back of the patient.
To accomplish this and other objectives the invention has the characteristics specified in the claims.
The accompanying drawings illustrate by way of example an embodiment of the invention and a modified locking system between the support members and the securing members and more particularly:
FIG. 1 shows in perspective from the rear and side some spinal vertebrae with two instruments according to the invention arrangement for adjusting displacement of two vertebrae.
FIGS. 2(a) and 2(b) respectively illustrate one of said instruments in a plan view and end view, partly in section.
FIG. 3 shows the instrument as shown in FIG. 2 but without securing member in a front view, partly in section.
FIG. 4 shows part of the instrument on a bigger scale in a front view, partly in section.
FIG. 5 is a section along line V--V in FIG. 4.
FIG. 6 is a plan view on a bigger scale of the securing member without screw.
FIG. 7 shows in a plan view a slightly modified instrument according to the invention.
FIG. 8 is a section along line VIII--VIII of FIG. 7.
FIG. 9 shows the instrument according to FIG. 7 in an end view.
The instrument as shown in FIGS. 2-6 inclusive comprises two support members 1a, 1b which are mutually connected by means of a screw spindle 2, which as appears from FIG. 2 has a threaded portion 3, which engages an internal thread 4 of one of the support members 1b. The screw spindle 2 passes through said internally threaded hole, and outside the latter it has a key handle 5. The unthreaded portion 6 of the screw spindle passes through an unthreaded bore 7 in the other support member 1a and also in this case the projecting end of the spindle is formed
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Bulletin No. 70; Experimental: Fixateur, Interne fur de Wirbelsaule.
Truluck Dalton L.
Whelton Denise
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