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Патент USA US2056417

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oops, 1936.
‘
L. L. BOSWORTH
2,056,41 7
DENTAL INSTRUMENT
Filed ‘June_ 28, 1955
, LUTHER LAWRENCE BOSWORTH
' »-INVENTOR
BY
ATTORN Y
2,056,417
Patented Oct. 6, 1936
UNI TED STATES PATENT OFFIQE
2,056,417
DENTAL INSTRUMENT
Luther Lawrence Bosworth, San Diego, Calif.
Application Junez-28, 1935, Serial .No. 28,907
6 ‘Claims.
This invention relates to a dental ossisector,
the primary use of which ‘is to remove .bon-y
structure overlying impacted teeth‘ vpreparatory
to extracting them.
To the dental profession the problem of ‘im
pacted teeth is intensely interesting ‘and of great
importance. Heretofore only three methods
have been employed ‘in the removal ‘of such
teeth; (1) the chisel-and mallet, (2) the ‘surgi
10 cal drills; and. (3) the hand pressure ‘cutting in
struments.
Progress in vdental surgery depends 'as much
upon improving the instruments employed as
upon improved technique. ‘There :has long been
15 felt a need for improving present instruments in
.such a manner as to make it possible to cut bone
with less pressure, less ‘exertion, and less trau
matization (of tissue. Also ‘to shorten the time
required for operations thus lessening the shock
'20 to the patient.
By this invention an instrument is provided
whereby an improved ‘and radically different
method of operating upon impacted teeth is .ren
dered possible, but the use of the invention is by
25 no means con?ned to impacted teeth.
Instru
ments constructed according to the principles of
this invention are applicable anywhere in the
mouth, and when badlycurved or exostosed roots
are found the tooth can be removed ‘intact after
30 these instruments have been used to remove the
obstructing tissues. Among the objects attained
and advantages securedby the use of the instru
ment furnished by this invention may be men
tioned the following: Local anaesthesia may be
used for all types of impactions; a safer control
of instruments is ensured; the operatorcan see
the ?eld of operation at all times; bony tissure
can be more easily ‘removed; very little pressure
is required when cutting away the ‘bony struc
40 ture; less cutting is necessary; ease of operation
results with less shock to the patient; there is
less trauma and a more rapid recovery; and "there
is afforded to the operator greater ease and dis
patch in the removal of impacted teeth.
Other objects, advantages and features of in
45
vention may hereinafter appear.
Referring to the accompanying drawing, which
illustrates what is at present deemed to be a
preferred embodiment of the invention,
50
Fig. 1 is a perspective view of the complete
instrument.
Fig. 2 is a transverse section, on an enlarged
scale, thru the applicator portion thereof, on line
2-2 of Fig. 1.
Fig. 3 is a vertical section of the applicator
55
(Cl. 32-—46)
portion, the plane of section ‘being indicated by
the line 3-~3 on Fig. 12.
Fig. .4 is 1a side elevation illustrating the posi
tion of‘ one of the instruments in an operative
situation within the mouth of 'a‘ipatien't, the root I
of thetooth ibeingoperated upon and those of
adjacent teeth being shown in dotted lines, an
other of the instruments ‘being ‘similarly shown
in ‘readiness to perform the second stage of "the
operation.
To
Fig. 75 is a 'view like Fig. 4 except that other
types of instruments, constructed according to
the ‘principles of the invention‘ are illustrated
"and positioned for di?‘erent cutting operations.
‘Fig. 6 is a side elevation outlining diagram .15
matically the ‘applicator portions of a set of in~
struments ‘differing ‘in design but (all constructed
in vaccordance with the invention.
Referring ‘in detail to the drawing, the appli
cator portion 5 of the instrument ‘designed as 1220
shown-in Figs..1,»2:and-8 is of va somewhat vwedge
sh'a-ped character and has, extending lengthwise
of its face a ‘plurality of longitudinal, angular
vcutting ridges or blades. By preference and as
:shown, ‘these cutters consist of a prominent
central "cutter '6, and outer cutter ‘I at each ‘side
and ‘a ‘cutter 8 at each side between an outer-‘cut
ter 1 and the central tooth 16.’
'
The applicator :portion \5 is joined by means of
:an offset neck 11 ‘to a diametrically reduced
1. 30
portion ‘I2 of the tool shank ‘l3,'th'ere preferably
being a de?nite annular shoulder l4 between'the
shank‘ portions 12 and 1.3. A transversely ‘ex
tending handle 15 “having 1a fluted ‘central portion
[6 is secured to the outer end of ‘the shank 1T3.
Describing more in ‘detail the applicator or cut
ting portion '5 of ‘the instrument, said ‘portion, as
viewed in transverse section, is somewhat convex
and preferably smooth along its back side I1, and
its opposite side or face is of a serrated, generally 1:40
convex shape, the side portions being chamfered
or ?attened at l8. Owing to the downwardly
tapering character of the cutting portion '5, each
of the ?ve angular cutting ridges thereof, which
operates as a knife upon the bone with a shear
45
ing action, diminishes downwardly in its cross
sectional extent. The central cutting ridge 6 is
shown as substantially right angled in cross sec
tion, the a greater or less degree of angularity
could be used without departing from the spirit 50
of the claimed invention. The cutter ridges ‘I
and 8 at each side of the center each have their
faces disposed to each other at less than a right
angle as viewed in cross section, and perform
their cutting or shearing action when the too} 65
2.
2,056,417
is rocked as indicated by the arrows above Fig. 2.
That is to say, the right hand cutters ‘l and 8
cut when the tool is rocked towards the left, and
applicator portion which extend lengthwise there
the corresponding left hand cutters act when the
tool is rocked in the opposite direction.
of and progressively diminish in their cross sec
tional extent away from that end of the applicator
oppositely disposed inwardly directed converging
cutting ridges occupying one side or face of said
Fig. 4 shows the operative relation of the in- ‘ portion which is joined to the aforesaid shank,
strument in relation to an impacted molar tooth
20 to remove the obstructing portion of the bony
structure at one side of the crown of the offend
10 ing tooth to permit the proper application of an
elevator thereto.
In removing the bony tissue
the face of said applicator portion which is oc
cupied by said cutting ridges being of a generally
convex character as viewed in cross section.
2. A tool of the kind described having an appli
cator portion with outwardly convexed opposite
as stated the instrument is operated by a rocking faces and a set of converging cutter ridges extend
movement during which its cutting surface mayv ing longitudinally of one of said faces, the cutter
be either directed away from or towardthe tooth
15 to be elevated, while its smooth back surface is
edges at each side of the medial portion of said
applicator portion being directed toward the mid
always directed towards the adjacent tooth, ,width thereof.
This manner of operating the instrument pre
vents the tooth not being removed from having
its enamel injured.
20
'
The various cutting ridges of the instrument
are bone knives with their cutting edges- arranged
to operate in both directions so as to produce the
greatest cutting efficiency. The bone is cut or
sheared from three surfaces, right, left and in
front when either a right or left motion is em
ployed, the rocking movement usually being thru
an angle of ninety degrees.
.
In Fig. 5 the letter Z) designates the type of
instrument used at the beginning of an excavat
ing operation, and (1 shows the position of an
other instrument substituted for the ?rst in order
that this operation may be satisfactorily com
pleted, thereby providing a clearance above and
behind the impacted molar, so that it can be
raised and extracted.
Altho the invention is illustrate-d in the draw
ing in an operative relation to impacted teeth,
yet it is to be understood that it has a wide range
of use in other situations for cutting bone when
bone surgery is indicated.
In Fig. 6 is shown a representative set of in
struments constructed according to the princi
ples of the invention. These instruments are
lettered, from left to right, a, b, c, d, e‘ and a’, the
45 instruments a and a’ differing from each other
only in that one is for right, and the other for left
hand use. Figs. 4 and 5 illustrate the use of in
struments a’, b, d and e. The instrument shown
in Figs. 1, 2 and 3 is of a still different design.
In Fig. 6 the letter 12 is applied to the applicator
50
portion of each instrument to designate the
toothed or cutting face thereof.
So long as the general shape and arrangement
of the cutting or shearing elements remain within
the scope of the appended claims, various details
thereof may be changed, as skilled workmen may
desire, without departing from the spirit of the
invention.
I claim:
1. An instrument of the kind described having
an applicator portion which tapers from one end
to the other, and a shank joining the larger end
of said applicator portion, there being a set of
15
3. A tool of the kind described having an appli
cator portion with convexed opposite faces and a
plurality, of angular cutter ridges or blades ex
tending lengthwise and slantingly of one of said 20
faces, there being a central cutting ridge which
runs longitudinally of the axis of the tool and
projects farther than the others, and the slanting
cutters at each side of said central cutter substan
tially converging to a point and having their 25
cutting edges directed towards said central cutter.
4. In an instrument of the kind described, an
applicator portion having two oppositely disposed
faces each of a convex character, said instrument
having a shank portion united to one end of said‘ 30
applicator portion, that end of said applicator
portion being the largest and said applicator por
tion tapering toward its opposite or outer end,
and there being a set of correspondingly tapering
bone cutting knives or ridges extending length 35
wise of one of said convex faces, said knives in
cluding a relatively large central knife which
shears when the tool is rocked towards either side
and cutting knives at each side thereof whose
cutting edges are directed towards said central 40
knife.
'
'
5. A tool of the kind described, said tool having
an applicator or cutting portion comprising two
oppositely disposed faces each of which converge
toward .a common point, one of said faces con
45
stituting a front face and the other constituting
a rear face, each of said faces being of a convex
character with the rear face of less convexity than
said front face, said front face having a plurality
of converging cutters at each side of the medial
portion of said' applicator which are directed
toward the mid-width of the tool.
6. In an instrument of the kind described, an
applicator portion having two oppositely disposed
faces of diverse convexities, said instrument 55
having a shank portion united to one end .of said
applicator portion, that end of said applicator
portion being the largest and said applicator por
tion tapering towards its opposite end, and a
plurality of correspondingly tapering inwardly 60
directed knives on one of said faces.
LUTHER LAWRENCE BOSWORTH. '
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