U.S. patent number 3,670,733 [Application Number 05/071,640] was granted by the patent office on 1972-06-20 for precise depth cutter.
Invention is credited to Richard S. Carlisle.
United States Patent |
3,670,733 |
Carlisle |
June 20, 1972 |
**Please see images for:
( Certificate of Correction ) ** |
PRECISE DEPTH CUTTER
Abstract
A flat member is incised at an angle of approximately 45.degree.
to a straight section of its perimeter, and a narrow portion of the
body adjacent to the 45.degree. angle is folded approximately
90.degree. to form a guide. The remaining downwardly extending
portion on the other side of the incision is sharpened to form a
straight blade which can be ground to a desired length to cut soft
materials precisely to exact depths. To maximize safety, a rounded
portion is formed rearwardly from the blade region. The blade edge
is totally exposed below the plane of the guide, to help promote
accuracy. The angle of the blade edge and the slight downward
inclination of the unsharpened edge extending rearwardly from the
point, allow the device to initiate and sustain a prescribed depth
incision with relatively slight downward pressure required on the
part of the user.
Inventors: |
Carlisle; Richard S.
(Thornwood, NY) |
Family
ID: |
22102620 |
Appl.
No.: |
05/071,640 |
Filed: |
September 14, 1970 |
Current U.S.
Class: |
606/172; 30/294;
30/286; 76/104.1 |
Current CPC
Class: |
A61B
17/32093 (20130101) |
Current International
Class: |
A61B
17/32 (20060101); A61b 017/32 (); B26b 029/00 ();
B21k 011/00 () |
Field of
Search: |
;30/164.9,286,294
;128/305,314 ;76/14R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pace; Channing L.
Claims
I claim:
1. A device for use in incising a prescribed depth into soft
material upon a movement of said device across the surface of the
material, comprising a thin, flat main body portion, an extending
blade portion substantially in the plane of the main body, and
having a blade edge disposed at an acute angle to the plane of an
adjacent guide portion carried by the main body and disposed
approximately perpendicularly to the plane of the main body
portion, the blade edge protruding outwardly from the main body
portion past the plane of said guide portion, the guide portion
extending on both sides of an imaginary plane intersecting the
blade edge at an intermediate region thereof and extending
perpendicularly to the plane of the guide portion so as to support
soft material directly opposite the material being incised, said
guide portion terminating in an edge forming an acute angle with
the plane of the main body portion at the side of the guide portion
adjacent the blade edge, the blade edge ending at a point formed
with an unsharpened substantially straight edge in a plane which
diverges from the blade end at an acute angle less than the angle
formed by the blade edge and the plane of the guide.
2. A device as set forth in claim 1 wherein the outer perimeter of
said guide portion forms an angle of less than 60.degree. to the
plane of said main body portion at the juncture of the end of the
guide portion remote from its juncture with the blade portion, and
the main body.
3. A device as set forth in claim 1 wherein a short region of the
perimeter of said main body portion beginning at the juncture
between the end of the guide portion remote from its juncture with
the blade portion, and the main body, curves outwardly.
4. A device as set forth in claim 1 wherein said unsharpened
substantially straight edge is disposed at an angle of
approximately 10.degree. to the plane of said guide portion, and
extends to a juncture with a rounded tail portion which is
substantially in the plane of the main body.
5. A device as set forth in claim 1 wherein, an abbreviated handle
portion is formed as part of the main body, such that the device
may be substantially concealed from view when held in the hand of
the user in an operating position.
6. A device as set forth in claim 5 wherein, said handle portion is
coated with a material suitable for gripping with the finger
tips.
7. A method of making a device for incising a precise depth into
soft material including the steps of:
a. Stamping out a suitable pattern of sheet metal to form the main
body of the device including a perimeter having a straight
portion,
b. making a shear cut at an acute angle to the straight portion of
the perimeter and folding at an angle of at least 80.degree. to the
plane of the pattern an edge region of the pattern adjacent to the
acute angle side of the shear cut.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
There is provided a cutting device which can initiate and maintain
the depth of an incision in soft materials accurately to within two
(2) one-thousandths of an inch. Only slight downward pressure is
required on the part of the user, as the blade edge and point are
established at angles calculated toward this effect.
2. Brief Summary of the Invention
In the practice of surgery, most procedures have involved the use
of cutting devices which are controlled entirely by the surgeon.
Various types and shapes of blades have been developed for specific
procedures, but little consideration has been given to controlling
the depth attained by a given movement of the knife across the soft
tissues involved.
One specific procedure in surgery involves the initial incision
through the skin. In this procedure, bacteria from hair follicles
and sweat pores are gathered up by the knife blade and deposited
along the bottom of the incision. The blade of this invention, in
contrast, cuts the skin with an upward force, sweeping the bacteria
up toward the surface rather than down into the incision.
In micro-surgery (eye surgery, vascular surgery, neuro-surgery,
plastic surgery, etc.), the surgeon must take great pains to
control the depth of incisions. The construction of this invention
can provide the exact cutting depth required for a procedure within
approximately two-thousandths of an inch. This invention also makes
possible prescribed depth scratches for use in skin and allergy
research and testing procedures.
In office surgery, the possibility of cutting too deeply for minor
procedures, such as lancing boils, removing sutures, etc., is
prevented, while a method of simultaneously attaining the optimal
depth is provided.
Commercial uses include a safer and more accurate device for
biological dissecting kits and snake bite kits. It also serves as a
safe and convenient surgical dressing knife.
For home use, the device provides a safe toy knife, sewing thread
cutter, and splinter remover. (It removes surface splinters quickly
with relatively slight tissue disruption or pain.)
It is accordingly the primary object of this invention to provide a
sterilizable and disposable device to cut accurately in depth such
materials as soft animal tissue, soft plastics, rubber, and certain
paper materials.
The objects, features, and advantages of this invention will become
more apparent from the following description and accompanying
drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side view of the device, adapted to be affixable to a
surgical knife handle.
FIG. 2 is an end view of the rear portion of the device of FIG.
1.
FIG. 3 is a bottom view of the device of FIG. 1.
FIG. 4 is an adaptation of the device of FIG. 1, with an integral
vinyl-coated handle. The device is shown in a cutting position in
soft material.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In carrying out a preferred embodiment of the device, flat,
spring-tempered stainless steel, of a thickness between
two-thousandths and thirty-thousandths of an inch, is first stamped
into an appropriate pattern or outline. The pattern body is then
shear-cut at a point along a straight portion of the perimeter, at
an angle of approximately 45.degree.. The region on the 45.degree.
angle side is bent perpendicularly (or if a greater angle is
desired, obtusely) to the plane of the pattern body, forming a
guide. The region on the supplementary angle side remains in the
plane of the pattern body, and the shear-cut edge, downwardly
extending, becomes the blade.
FIG. 1 shows that a straight region 14 along the body perimeter is
shaped to form an angle, indicated at 16, of 10.degree. relative to
guide 12. This angle is essential for initiating entry of the blade
point 18 into flat, smooth material. The angle of the blade 13 to
the plane of the guide 12 will be approximately 45.degree. . The
point angle 17 will therefore be approximately 35.degree. . A
region 21 of the perimeter is shown to be slightly curved. This
curved region, in advance of guide 12, helps the device to slide
freely over soft materials. Slot 11 provides a means for affixing
the device to a surgical knife handle.
A rear rounded portion 20 is formed to provide assurance that no
unintentional cutting or damage occurs while placing the device
into, or removing it from an operating position, or while it is in
use, either to the user or to the material on which it is being
used.
FIG. 2 shows the location of the guide 12 relative to the plane of
the body of the device 10.
FIG. 3 shows the blade point 18 relative to the plane of the guide
12. The forward portion of the guide 12 is shown to be at an angle,
indicated at 19, of approximately 30.degree. . This relatively
small angle is an additional feature in allowing the device to
slide freely over soft material.
FIG. 4 shows an adaptation of the device with an integral
abbreviated handle coated with vinyl plastic 22. The handle is
designed so that the device can be pulled along a soft material 23,
maintaining the continuance of an incising process with negligible
downward pressure required on the part of the user. It is small
enough to be concealable in the hand of the user, at times when
this is appropriate, such as lancing a boil in a child patient.
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