U.S. patent number 3,723,704 [Application Number 05/097,161] was granted by the patent office on 1973-03-27 for cautery apparatus.
Invention is credited to John D. Silverthorne.
United States Patent |
3,723,704 |
Silverthorne |
March 27, 1973 |
CAUTERY APPARATUS
Abstract
Cautery apparatus including a base for mounting an elongated
pen-shaped cautery tool formed on one end with a long, narrow tip
constructed of metal having good heat retention characteristics.
The base includes an electrical heater and has a retractor mounted
thereon for receipt of the cautery tool and shiftable from a
heating position to carry the tool from a position holding the tip
adjacent the heater to a retracted position moving the tip away
from the heater. The retractor is biased to its retracted position
and a thermally responsive retainer is engageable with such
retractor to hold it in the cautery heating position and is
responsive to a predetermined temperature to release the retractor
to be returned to its retracted position.
Inventors: |
Silverthorne; John D. (Long
Beach, CA) |
Family
ID: |
22261609 |
Appl.
No.: |
05/097,161 |
Filed: |
December 11, 1970 |
Current U.S.
Class: |
219/242; 30/140;
219/227; 219/385; 606/27; 211/69.6; 219/241; 219/521 |
Current CPC
Class: |
A61B
18/00 (20130101); A61B 18/082 (20130101) |
Current International
Class: |
A61B
18/00 (20060101); A61B 18/08 (20060101); A61B
18/04 (20060101); A61b 017/38 (); H05b 001/02 ();
H05b 003/02 () |
Field of
Search: |
;128/303.1,303.17,303.18
;30/140 ;219/221,222,227,228,229,240,242,521,385,386,200,201
;126/226-235 ;99/334,336,326,329 ;211/69.1,69.6 ;165/80 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
301,866 |
|
Feb 1930 |
|
GB |
|
10,722 |
|
Jan 1917 |
|
GB |
|
718,216 |
|
Nov 1931 |
|
FR |
|
Primary Examiner: Bartis; A.
Claims
I claim:
1. Cautery apparatus comprising:
a base;
an elongated cautery tool formed on one end with a long narrow tip
constructed of metal having good heat retention characteristics and
tapering gradually inwardly and forwardly to terminate in a cautery
point, said tool tapering outwardly and rearwardly from said tip to
form a long slender handle extending rearwardly from said tip to
cooperate with the rear portion of said tip to form a substantially
regular and continuous longitudinal cross section leading
rearwardly from said tip;
electrical circuit means in said base and including a series
connected electrical heater and switch means;
a retractor mounted on said base for receiving said tool, said
retractor being movable to carry said tool from a heating position
holding said tip adjacent said heater to a retracted position to
move said tip away from said heater, said retractor operatively
engaging said switch means to maintain said heater energized when
said retractor is in said heating position and being operative to
open said switch means when said retractor moves to its retracted
position;
biasing means biasing said retractor to its retracted position;
and
a thermally responsive retainer carried by said holder and disposed
in heat exchange relationship with said heater element and
engageable with said retractor for holding said retractor in its
heating position and responsive to a predetermined temperature to
release said retractor to be biased to said retracted position.
2. Cautery apparatus as set forth in claim 1 wherein:
said base is formed with a spherical cavity defining retractor
support means; and
said retractor includes an open ended barrel for receipt of said
tool and formed at one extremity with a spherical ball received in
said spherical cavity for relative rotation therein to orient said
barrel at different angles.
3. Cautery apparatus as set forth in claim 1 wherein:
said cautery tool includes a peripheral recessed channel formed
adjacent said tip; and
said retainer includes a multi-metallic thermostatic blade normally
engagable in said channel to hold said retractor in said heating
position and responsive to said predetermined temperature to flex
and disengage said channel to free said retractor for retracting to
said retracted position under the influence of said biasing
means.
4. Cautery apparatus as set forth in claim 1 wherein:
said switch means includes switch actuator means disposed in the
path of said retractor as said retractor moves between said
retracted and heating positions and engagable thereby to hold said
switch means in its closed position while said retractor is in its
heating position to maintain said heater energized, said actuator
being operative upon movement of said retractor from its heating
position to its retracted position to open said switch.
5. Cautery apparatus as set forth in claim 1 wherein:
said electrical circuit includes a step-down electrical transformer
for connection with a high voltage source to provide low voltage to
said heating element.
6. Cautery apparatus as set forth in claim 1 wherein:
said electrical circuit includes indicator means responsive to a
predetermined temperature of said heating element to indicate
heating of said cautery tip has been completed.
7. Cautery apparatus as set forth in claim 1 that includes:
mounting means carried by said base and mounting said retractor for
rotational movement whereby said retractor may be rotated to
different positions for holding said cautery tool in different
positions.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to cautery devices for burning holes
through a patient's injured fingernail, or the like, to relieve
pressure created by blood accumulated thereunder.
2. Description of the Prior Art:
It has been common practice to provide cautery devices with
electrical cords connected with the handles thereof for heating the
cautery tip to a desired temperature. Cautery devices of this type
suffer the shortcoming of being relatively inconvenient to use
because of their relatively large size and the fact that the
electrical cord restricts manipulation of the tool. Cauterizing
tools have also been proposed which include a handle formed with a
battery-receiving compartment for receipt of batteries that are
utilized to heat a cauterizing tip. A cauterizing apparatus of this
type is shown in U.S. Pat. No. 3,461,874. Cauterizing devices of
this type suffer the shortcoming of requiring a relatively large
handle thereby rendering the tool relatively unwieldy to use and
presenting a rather frightening appearance for a patient about to
have a hole burned through his injured fingernail.
SUMMARY OF THE INVENTION
The cautery apparatus of the present invention is characterized by
a pen-shaped cautery tool having a pointed cauterizing tip and
receivable in a retractor which is normally biased to a retracted
position but which may be moved to a heating position disposing
such tip adjacent an electrical heater. A thermally responsive
retainer contacts the retractor and is operative to hold such
retractor in the cautery heating position and is responsive to a
predetermined temperature of the heater to release such retractor
for retracting the cautery tool.
An object of the present invention is to provide a cautery
apparatus of the type described which includes a cautery tool that
is relatively compact in construction and which can be readily
manipulated during the cauterizing operation.
Another object of the present invention is to provide a cautery
apparatus of the type described which includes a tool that does not
have an electrical cord, or the like, connected therewith.
A further object of the present invention is to provide a cautery
apparatus of the type described wherein the cautery tool can be
rotated to a number of positions with respect to the base on which
it is mounted.
A still further object of the present invention is to provide a
cautery apparatus of the type described wherein the heating element
is automatically turned off at a predetermined temperature.
These and other objects and the advantages of the present invention
will become apparent from a consideration of the following detailed
description when taken in conjunction with the accompanying
drawing.
DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of a cautery apparatus embodying the
present invention;
FIG. 2 is a vertical sectional view taken along the line 2--2 of
FIG. 1;
FIGS. 3 and 4 are vertical sectional views similar to FIG. 2 but in
enlarged scale and partially broken away; and
FIG. 5 is a vertical sectional view taken along the line 5--5 of
FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The cautery apparatus of present invention includes, generally, a
base 21 having a mounting device 23 carried thereon for receipt of
a cautery tool 25. Referring to FIG. 4, the cautery tool includes a
curved tip 29 made of metal having high heat retention
characteristics and such tip is disposed in heat exchange
relationship with an electrical heating coil 31 mounted in the base
21. Consequently, the cautery tool 25 may be placed in the mount 23
and the heating element 31 energized to heat the cautery tip 29.
When such cautery tip is heated sufficiently, the tool 25 may be
removed from the base 21 and utilized to cauterize a hole through
an injured fingernail to relieve pressure resulting from collection
of blood thereunder.
In the preferred embodiment, the base 21 is of generally hollow
construction and is made of an electrically insulative plastic.
Such base includes a bottom wall 35 having an inverted cup-shaped
upper portion 37 mounted thereon. The bottom wall 35 is formed with
an upwardly opening concave cradle 38 which has a rotatable ball 39
formed by the lower portion of the mounting device 23 sitting
thereon.
Referring to FIG. 3, the mounting device 23 is conveniently made in
two halves and is formed with a barrel 43 projecting upwardly from
the ball 39 and through an opening 44 in the top wall of the base
21. The barrel 39 has a cylindrically-shaped retaining sleeve,
generally designated 47, telescoped into the upper portion
thereof.
Disposed in the lower extremity of the barrel 39 are a pair of
diametrically opposed downwardly projecting resilient fingers 51
which are formed on their lower extremities with respective
inturned retaining ribs 49. The fingers 51 are composed of a pair
of laminations possessing different coefficients of thermal
expansion so such fingers will spread apart when heated.
A cylindrically-shaped retractor, generally designated 55, is
telescoped downwardly into the sleeve 47 and is formed on its upper
extremity with a radially outwardly projecting flange 57. The
retractor 55 is biased upwardly by means of a coil compression
spring 59 which surrounds such retractor and abuts the rim 57 on
its upper end and abuts an inwardly crimped rim 61 formed
intermediately in the sleeve 47 on its lower end. The lower
extremity of the retractor 55 is formed with a pair of expanded
exterior rings 65 and 67 which are spaced apart to form a retaining
channel 69 therebetween for receipt of the radially inwardly bent
retaining ribs 49 formed in the lower extremities of the respective
fingers 51.
Referring to FIG. 5, the heating coil 31 is formed with a lower
extremity defining a first electrical terminal 71. The coil 31 is
mounted by means of the terminal 71 which is carried in an
electrical insulator 73 mounted in an aperture 75 formed in the
wall of the mounting ball 39. The top end 81 of the heating coil 31
has the free end of a resilient electrical terminal 83 normally
spaced therefrom. The opposite end of the electrical terminal 83 is
mounted in an electrical insulator 85 carried in an aperture 87
formed in the wall of the spherical mounting ball 39. It is noted
that the free end 83 of the resilient electrical terminal is
disposed in confronting relationship with the lower extremity of
the retaining sleeve 47 and in the path of the lower extremity of
the retractor 55 for engagement thereby when such retractor is in
the inserted position shown in FIG. 4 to thereby hold such free
extremity 83 in engagement with the top end 81 of the heating coil
31.
Referring to FIGS. 1 and 2, a male electrical plug, generally
designated 86, is formed integrally with the base 21 and includes a
pair of plug prongs 87 and 88 which are connected across the
primary coil of a step-down transformer 89. One end of the
secondary coil of the transformer 89 is connected with one terminal
of an indicator light 91 by means of a lead 93 and the other
terminal of such indicator light is connected with the resilient
heating coil terminal 83 by means of a lead 95. The mounting
terminal 71 of the heating coil 31 is connected with the opposite
end of the secondary coil of the transformer 87 by means of a lead
99. Consequently, the voltage applied to the heating coil 31 is
reduced well below the line voltage to thereby reduce the danger to
the personnel utilizing the cauterizing apparatus.
The cauterizing tool 25 includes a relatively long, slender handle
101 which simulates a fountain pen thereby rendering the tool
itself readily maneuverable and providing a less frightening
appearance to a patient than is the case for the conventional
rather bulky cauterizing tools which incorporate a power source for
heating the cautery tip. The cautery tip 29 is preferably made of
stainless steel or other metal which possesses high heat retention
characteristics. The tip 29 is curved on its extremity and forms a
point 103 for burning a small hole through a fingernail or the
like.
In operation, when it is desirable to cauterize a hole through an
injured fingernail, the cauterizing tool 25 is pressed downwardly
in the holder 23 against the bias of the spring 59 (FIG. 3) to
spread the resilient lower extremities of the retaining fingers 51
to engage the retaining channel 69 formed in the lower extremity of
the retractor 55 to thereby hold such retractor 55 in its depressed
position shown in FIG. 4. While the retractor 55 is held depressed
within the barrel 43, the lower end thereof will maintain the free
end of the electrical contact 83 (FIG. 5) held downwardly in
contact with the upper end 81 of the heating coil 31 to thereby act
as a closed switch to complete an electrical circuit through the
indicator light 91 and through such heating coil 31. Consequently,
the indicator light 91 will be energized to indicate that the
cauterizing tip 29 is being heated.
When the cauterizing tip 29 has been heated to the desired
temperature, the retaining fingers 51 will have been heated
sufficiently to spread lower extremities thereof apart sufficiently
to disengage the retaining ribs 49 from the retaining channel 69 of
the retractor 55 to free such retractor to be biased upwardly by
means of the biasing spring 59. Retraction of the retractor 55
upwardly will disengage the lower extremity thereof from the free
end of the electrical contact 83 to thereby free such contact to
disengage the upper end 81 of the heating coil 31 to open the
circuit through the indicator light 91 and through the heating coil
31 thereby indicating that heating has been completed and
preventing overheating of the tip 29.
The cauterizing tool 25 may then be removed from the holder 23 and
utilized to perform the cauterizing operation without the
inconvenience of handling a relatively bulky handle which houses an
electrical source or manipulating a tool which has an electrical
cord connected with one end thereof. It is noted that the mounting
ball 39 may be pivoted to angle the mounting device 23 and,
consequently, the tool 25 in any one of a number of directions for
convenient storage or use.
From the foregoing detailed description it will be apparent that
the cauterizing apparatus of present invention provides a
cauterizing tool which is relatively convenient to use and which
presents a pleasing appearance to a patient thereby avoiding
unnecessarily frightening youthful or squeamish patients. Further,
the cauterizing apparatus automatically discontinues heating of the
cauterizing tip at a predetermined temperature to prevent
overheating thereof and provides a visual indication that heating
has been completed. Additionally, the holder may be pivoted to
numerous different positions for convenient access thereto and for
fitting into any number of different storage spaces.
Various modifications and changes may be made with regard to the
foregoing detailed description without departing from the spirit of
the invention.
* * * * *