Surgery – Instruments – Orthopedic instrumentation
Patent
1995-12-05
1998-04-21
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 80, 606 72, 606 73, 433 72, 433 75, 433165, A61B 1716
Patent
active
057412677
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a depth-marking system arrangement in connection with the formation of implant holes in the jawbone. The present invention includes at least one band markings arranged on the tool being used, that is drill, countersinking drill, among others and, if appropriate, on the measuring instrument. Each implant is ascribed a nominal length that is less than the actual length of the implant.
BACKGROUND OF THE INVENTION
It is well known to form holes in the human jawbone. The drill speeds are relatively high, for example 2500 rpm. During the drilling and hole-forming work, it is known to make use of marking systems comprising bands for determining the hole depth.
SUMMARY
In connection with forming holes for implants, a need has arisen for better functioning depth-marking systems. The present invention aims to solve this problem among others.
The present invention proposes to form holes on the inner part of the jawbone. This in contrast to know methods where implant work was carried out exclusively on and in the front parts of the jawbone. The inner parts of the jawbone are rich in nerves. Therefore, greater accuracy in respect of the depth of the holes formed must be possible, to ensure that nerves are not damaged when forming the holes. It is important that the user should have accurate information relating to the varying depth of the respective hole as the work is progressing. The present invention solves this problem too.
The use of band markings which are known per se must be adapted to the high degree of accuracy of indication. It is important, in this respect, that no misjudgments should be possible on the part of the user. The present invention solves this problem too.
According to the present invention, the novel depth-marking system is employed on tools and measuring instruments used in work for forming holes. It is important that band markings be in relation to the different functions of the tools and measuring instruments. The present invention solves this problem.
Alternative uses of band markings in connection with different implant areas are additionally desirable. One particular use of the depth-marking system suits one user better than it does another user. The present invention aims to solve this problem by offering different possibilities and formats for using the depth-marking system.
The feature that can principally be regarded as characterizing an arrangement according to the invention is that a first delimiting line or marking on a first band marking represents an indication of an absolute measurement of the hole depth. The absolute measurement in question in this case also includes an inner cone-shaped portion of the hole that corresponds to the cone-shaped part of the drill. Also characteristic of the present invention is a second delimiting line or marking on the first band marking or a second band marking that represents an indication of a position or a level which is reached by an upper part or upper surface of a unit arranged on the implant in question. This unit can consist of a cover screw, cap, hood, among other structures.
In one embodiment of the present invention, the first delimiting line or marking represents a lower delimiting line or marking on the band in question. The second delimiting line or marking can be represented by an upper delimiting line or marking on the said band in question.
In further embodiments, two or more band markings can be arranged, with intermediate spacings between the band markings, on a tool in the form of one or more drills, by means of which the formation of the implant holes can be carried out. Each band marking can in this case be used for indication in conjunction with the formation of implant holes of different depths. In addition, two or more band markings can be arranged on a measuring instrument in the form of a measuring probe that can be applied in the implant hole that has been formed. Each band marking can in this case be used for indication in conjunction with the formation of
REFERENCES:
patent: 5190548 (1993-03-01), Davis
patent: 5342366 (1994-08-01), Whiteside et al.
patent: 5354300 (1994-10-01), Goble et al.
Jorneus Lars
Sullivan Richard
Buiz Michael
Nobel Biocare AB
Reip David O.
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