U.S. patent number 3,912,168 [Application Number 05/545,731] was granted by the patent office on 1975-10-14 for irrigation lavage.
This patent grant is currently assigned to Teledyne Industries, Inc., Teledyne Aqua Tec. Invention is credited to Thomas G. Cannon, Keith M. Mullins, David W. Smith.
United States Patent |
3,912,168 |
Mullins , et al. |
October 14, 1975 |
Irrigation lavage
Abstract
An irrigation lavage is useful, for example, in wound
debridement. It serves to deliver pulses of fluid under pressure.
It includes a housing that defines a chamber in which an electric
motor is mounted so as to have a drive shaft projecting through one
chamber wall. Projecting outwardly from that wall is a boss that
defines a cylindrical cavity the axis of which coincides with that
of the shaft. A roller is rotationally mounted on the shaft with
its axis parallel to but offset from that of the shaft, the
diameter of the roller being less than the diameter of the cavity.
A resiliently-walled flexible tube runs between inlet and outlet
openings in the boss and around the interior wall of the cavity
with the double wall thickness of the tube being slightly greater
than the minimum spacing between the interior wall and the roller.
Overlying the cavity is a hinged door. The door is of transparent
material so as to permit observation of the proper operation of the
unit. The one chamber wall is constructed so as to form one end
bell in which one end of the motor shaft is journaled. The housing
accommodates a cooling fan and results in a compact structure.
Coupled to one end of the flexible tube is a nozzle assembly that
has a valve and valve operator manually adjustable to control the
rate of fluid flow as well as serving selectively to cause
cessation of that flow. The nozzle assembly is formed to include a
barrel portion joined to a handgrip portion that permits ready
operation by the fingers of the user.
Inventors: |
Mullins; Keith M. (Fort
Collins, CO), Smith; David W. (Wellington, CO), Cannon;
Thomas G. (Fort Collins, CO) |
Assignee: |
Teledyne Industries, Inc., Teledyne
Aqua Tec (Fort Collins, CO)
|
Family
ID: |
24177349 |
Appl.
No.: |
05/545,731 |
Filed: |
January 30, 1975 |
Current U.S.
Class: |
239/101; 239/349;
239/526; 604/153; 604/249 |
Current CPC
Class: |
A61M
3/022 (20140204); A61M 3/0208 (20140204); B05B
9/042 (20130101); B05B 9/0872 (20130101); F04B
43/123 (20130101); B05B 9/01 (20130101); A61M
3/0275 (20130101) |
Current International
Class: |
A61M
3/00 (20060101); A61M 3/02 (20060101); B05B
9/04 (20060101); B05B 9/01 (20060101); B05B
9/08 (20060101); B05B 9/00 (20060101); F04B
43/12 (20060101); B05B 003/14 (); B05B 007/30 ();
B05B 007/02 () |
Field of
Search: |
;128/DIG.10,12
;239/102,526X,349 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: King; Lloyd L.
Attorney, Agent or Firm: Drake; Hugh H.
Claims
We claim:
1. An irrigation lavage comprising:
a housing defining an enclosed motor-receptive chamber and having
continuous side walls and opposing end walls;
an electric motor mounted in said chamber and having a drive shaft
projecting through one of said end walls;
a boss projecting outwardly from the exterior of said one end wall
and defining a generally cylindrical cavity the axis of which
coincides with that of said shaft, said boss having inlet and
outlet openings defined in spaced portions of its walls;
a roller rotationally mounted on said shaft with the axis of said
roller parallel to but offset from that of said shaft, the diameter
of said roller being less than the diameter of said cavity;
a resiliently-walled flexible tube running from said inlet opening
to said outlet opening and around the interior wall of said cavity,
the double wall thickness of said tube being slightly greater than
the minimum spacing between said interior wall and said roller;
a door, of transparent material, hinged at one side of said boss to
close in overlying relationship to said cavity and in containment
of said tube;
and means for maintaining said door closed in said overlying
relationship.
2. An irrigation lavage comprising:
a housing defining an enclosed motor-receptive chamber and having
integrally continuous side walls and opposing end walls, one of
said end walls being attached to said side walls and the other of
said end walls being integral with said sidewalls;
an electric motor mounted in said chamber and having a drive shaft
projecting through said one end wall, said one end wall
constituting one end bell of said motor;
a boss projecting outwardly from the exterior of said one end wall
and defining a generally cylindrical cavity the axis of which
coincides with that of said shaft, said boss having inlet and
outlet openings defined in spaced portions of its walls;
a roller rotationally mounted on said shaft with the axis of said
roller parallel to but offset from that of said shaft, the diameter
of said roller being less than the diameter of said cavity;
a resiliently-walled flexible tube running from said inlet opening
to said outlet opening and around the interior wall of said cavity,
the double wall thickness of said tube being slightly greater than
the minimum spacing between said interior wall and said roller;
a door hinged at one side of said boss to close in overlying
relationship to said cavity and in containment of said tube;
and means for maintaining said door closed in said overlying
relationship.
3. An irrigation lavage as defined in claim 2 which further
includes a fan mounted within said chamber, means for coupling said
fan drivingly to said shaft, and means defining spaced inlet and
outlet vent openings in said housing.
4. An irrigation lavage as defined in claim 2 in which said one end
wall is supported exclusively from said motor, and said motor is
resiliently mounted to one of said side walls.
5. An irrigation lavage comprising:
a housing defining an enclosed motor-receptive chamber and having
continuous side walls and opposing end walls;
an electric motor mounted in said chamber and having a drive shaft
projecting through one of said end walls;
a boss projecting outwardly from the exterior of said one end wall
and defining a generally cylindrical cavity the axis of which
coincides with that of said shaft, said boss having inlet and
outlet openings defined in spaced portions of its walls;
a roller rotationally mounted on said shaft with the axis of said
roller parallel to but offset from that of said shaft, the diameter
of said roller being less than the diameter of said cavity;
a resiliently-walled flexible tube running from said inlet opening
to said outlet opening and around the interior wall of said cavity,
the double wall thickness of said tube being slightly greater than
the minimum spacing between said interior wall and said roller;
a door hinged at one side of said boss to close in overlying
relationship to said cavity;
and a nozzle assembly coupled to the end of said tube extending
from said outlet opening, said assembly including a valve and a
valve operator manually adjustable to control the rate of fluid
flow through said tube and selectively to cause cessation of said
fluid flow.
6. An irrigation lavage as defined in claim 5 in which said
assembly includes a barrel portion joined to a handgrip portion
downwardly depending from one end of said barrel portion, in which
said assembly is coupled to said end of said tube by a flexible
conduit emerging from the bottom of said hand-grip portion, and in
which said valve operator is disposed in said barrel portion.
7. An irrigation lavage as defined in claim 6 in which said
assembly includes a continuous strap shaped to define both of said
portions, and in which said valve operator includes a
finger-operable cylinder accessible between opposing side edges of
said strap.
Description
The present invention relates to an irrigation lavage. More
particularly, it pertains to apparatus for delivering pulsating
jets of liquid useful, for example, in the debridement of wounds
and analogous medical treatment.
For a number of years, considerable success has been experienced in
connection with an oral hygiene appliance that delivers pulsating
jets of water for use in cleaning the teeth and massaging the gums.
Such apparatus is well known as manufactured and sold by the
assignee of the present application. In addition to its oral
hygiene employment, essentially the very same apparatus has
undergone extensive usage in the investigation and actual
application of the use of a pulsating fluid for debridement of
wounds suffered by human patients. The very same appliances that
had been developed for usage in homes have found their way into
remote military hospitals where they were subject to the conditions
of a much more demanding environment. While the appliances, thus
developed for dental usage in a home environment, performed
admirably in the more difficult conditions so encountered, it
became apparent that desired durability and full applicability
called for the development of a unit directed more precisely to the
problems particularly attendant to field usage.
Perhaps naturally, the successful experience of such apparatus in
the field gave rise to a corresponding interest in the development
of similar apparatus for usage in hospitals and the like. A
hospital locale is one which requires equipment that can withstand
long usage, accommodate sterile techniques (as also in the field),
and be capable of being operated by personnel inexperienced with
operation of the unit itself. While the aforementioned dental
hygiene appliance offered many valuable features for use either in
the field or in the hospital, it did not lend itself directly to
complete satisfaction of usage in such environments.
Seeking to better the situation, attention has been given to
apparatus which utilizes a long-known principle for achieving the
delivery of a pulsating jet of fluid. This involves the
incorporation of a collapsible, fluid-carrying tube that is
progressively squeezed by one or more rollers which press along the
walls of the tube. Such an approach has been used in connection
with the pumping of fluids ranging from milk to petroleum products.
Particularly as applied to such fields as the dairy industry,
pumping mechanisms of this type have proved valuable in that they
allow ready removability and sterilization of the flexible tube
that constitutes an important part of the pumping mechanism and
which enables ready sterilization of all components of the pumping
machinery that contact the milk (or other fluid) being
delivered.
Such prior approaches have, indeed, led to greatly improved health,
safety, efficiency and ease of maintenance. At the same time,
however, they have tended to lead to the development of rather
sophisticated and expensive apparatus designed to resolve what
might have been a more-easily solved problem.
It is, accordingly, a general object of the present invention to
provide a new and improved irrigation lavage that meets, overcomes
and resolves deficiencies and difficulties attendant to apparatus
of the character hereinabove mentioned.
Another object of the present invention is to provide a new and
improved irrigation lavage that permits ready utilization and
operating visualization of its components most significant in terms
of proper usage.
A further object of the present invention is to provide a new and
improved irrigation lavage which includes, as cooperative parts,
active pumping elements which are sufficiently inexpensive as to
enable their disposability after each usage.
An irrigation lavage constructed in accordance with the present
invention includes a housing that defines an enclosed
motor-receptive chamber which has continuous side walls and
opposing end walls. An electric motor is mounted in the chamber and
has a drive shaft that projects through one of the end walls. A
boss projects outwardly from the exterior of that one end wall and
defines a cylindrical cavity the axis of which coincides with that
of the shaft, the boss having inlet and outlet opening defined in
spaced portions of its walls. Rotationally mounted on the shaft is
a roller the axis of which is parallel to but offset from that of
the shaft. The diameter of the roller is less than the diameter of
the cavity. A resiliently-walled flexible tube runs from the inlet
opening to the outlet opening and around the interior wall of the
cavity. The tube has a double wall thickness which is slightly
greater than the minimum spacing between the interior wall of the
cavity and the roller. A door is hinged at one side of the boss so
as to close in overlying relationship to the cavity and in
containment of the tube. Finally, there are means for maintaining
the door closed in such overlying relationship. As one particular
feature, the door is of transparent material. In connection with
another feature, the housing is formed to have annularly continuous
side walls and opposing end walls with one of those end walls being
attached to the side walls and the other being integral therewith.
The motor is mounted in the chamber so as to have the drive shaft
projecting through the one end wall with that end wall constituting
the end bell of the motor. In another aspect, a nozzle assembly is
coupled to the end of the tube that extends from the outlet
opening. The assembly includes a valve and a valve operator which
is manually adjustable to control the rate of fluid flow through
the tube and selectively to cause cessation of such flow.
Furthermore, the nozzle assembly is pistol-shaped with its valve
operator being exposed for operability by the fingers on the
user.
The features of the present invention which are believed to be
novel are set forth with particularity in the appended claims. The
organization and manner of operation of the invention, together
with further objects and advantages thereof, may best be understood
by reference to the following description taken in connection with
the accompanying drawings, in the several figures of which like
reference numerals identify like elements, and in which:
FIG. 1 is a perspective view of one embodiment of an irrigation
lavage;
FIG. 2 is a side-elevational view of the apparatus shown in FIG. 1,
including in dashed line a representation of the open position of a
door associated therewith;
FIG. 3 is a front-elevational view of the main portion of the
apparatus shown in FIG. 1;
FIG. 4 is a front-elevational view of a nozzle assembly included in
the apparatus shown in FIG. 1;
FIG. 5 is a cross-sectional view taken along the line 5--5 in FIG.
2;
FIG. 6 is a cross-sectional view taken along the line 6--6 of FIG.
3;
FIG. 7 is a fragmentary cross-sectional view taken along the line
7--7 in FIG. 3;
FIG. 8 is a fragmentary cross-sectional view taken along the line
8--8 in FIG. 3;
FIG. 9 is a cross-sectional view taken along the line 9--9 in FIG.
4; and
FIG. 10 is an enlarged fragmentary cross-sectional view taken
laterally through the apparatus as shown in FIG. 9.
An irrigation lavage 20 includes a housing 22 that has continuous
side walls 24 and opposing end walls 26 and 28 which serve to
define an enclosed chamber 30 receptive of an electric motor 32.
Rear end wall 22 is cast integrally with side walls 24, while front
end wall 28 is a separate molding removably attached so as to nest
against the forward periphery of side walls 24. Motor 32 is secured
to forward end wall 28 by a plurality of four spaced screws 34 that
project through end wall 28 into the stator laminations of the
motor. Thus, end wall 28 constitutes one end bell of motor 32. The
forward end of motor drive shaft 36 projects through and is
journaled in front end wall 28. At the rear end of motor 32, that
end portion of drive shaft 36 projects rearwardly through a journal
38 mounted in an interior support wall 40 spaced parallel to and
inwardly from rear end wall 26 of housing 22. Mounted on the
extreme rear end portion of shaft 36 is a first spur gear 42 which
meshes with a second spur gear 44 mounted for rotation from
interior wall 40. Secured on the rear end of the shaft mounting
gear 44 is a multiple-bladed fan 46. Fan 46 draws cooling air for
ventilation through openings 48 formed in the bottom one of side
walls 24 and exhausts that air through openings 50 formed in rear
wall 26 of the housing. By using end wall 28 as one end bell for
the motor, only two bearings are required to journal motor shaft 36
and the pump. End wall 28 is secured to the remainder of the
housing by the fact that motor 32 is affixed to the bottom wall of
the housing by resiliently-grommeted screws 51.
A carrying handle 52 projects upwardly from the top one of side
walls 24, being disposed at least approximately above the center of
gravity of the lavage so as to permit its being carried in its
normal orientation. Parallel-spaced legs 54, enclosed across the
front by an integral panel 56, project downwardly from the bottom
one of walls 24 so as to form a base for the lavage, permit air to
be drawn from beneath the unit into openings 48 and cause the
lavage, when placed on a flat surface, to be disposed with the
upper edge portion of front wall 28 tilted backwardly. In use, such
tilt of the front panel permits more ready observation by the user
of correct pumping action, as will be described, and also
facilitates initial readying of the lavage for operation.
Electric power-supply cord 58 enters rear wall 26 through a grommet
and is wired through a switch 60 disposed with its handle
projecting through an opening in front wall 28, so as to permit
energization of motor 32. Projecting rearwardly from rear wall 26
is a U-shaped bracket 60 to the rearwardly-flange bite of which is
affixed a captivating flange 62. When the lavage is not in use,
cord 58 may be coiled in place by wrapping it around bracket 60 so
its coiled cord is captivated in place by flange 62. In use,
bracket 60 also serves to insure that the rear of the unit is
spaced from any wall or other surface that otherwise might
interfere with the free flow of ventilating air.
Projecting outwardly from the exterior of front end wall 28 is a
boss 64 that defines a generally-cylindrical cavity 66 the axis of
the working portion of which coincides with that of shaft 36. Boss
64 is formed to define an inlet opening 68 and an outlet opening 70
defined in spaced portions of the walls of boss 64. A roller 72 is
rotationally mounted on the forward end portion of shaft 36 with
the axis of roller 72 being parallel to but offset from that of
shaft 36. Thus, roller 72 is eccentrically mounted upon shaft 36 so
as, also, to have an eccentric relationship with respect to the
laterallyinterior wall of cavity 66; the working portion of the
latter extends from approximately the one o'clock to the seven
o'clock positions as determined by viewing FIG. 5. Roller 72 is
journaled for rotation upon a bearing 76 having a hub that is
secured off-center upon the forward end of shaft 36 by an integral
screw 78.
A resiliently-walled flexible tube 80 is disposed so as to run from
inlet opening 68 to outlet opening 70 and around the working
interior wall of cavity 66. That is, tube 80 is disposed in the
cavity between the aforesaid one o'clock and seven o'clock
positions. The double wall thickness of tube 80 is slightly greater
than the minimum spacing between that interior wall of cavity 66
and the perimeter of roller 72. When shaft 36 is in a rotational
position such that eccentrically related roller 72 is relatively
positioned toward the generally right-hand portion of the cavity
wall, as viewed in FIG. 5, tube 80 is pinched closed. Bearing 76
provides the existence of only rolling contact between roller 72
and tube 80.
Upon energization of motor 32 so that roller 72 rotates in the
counter-clockwise direction, again as illustrated in FIG. 5, the
pinching action upon tube 80 repetitively moves from the vicinity
of inlet opening 68 to the vicinity of outlet opening 70. In a
manner known as such from the prior art such as that discussed in
the introduction, the progressive pinching action serves to draw
fluid into tube 80 through inlet opening 68 and discharge that
fluid from the tube outwardly from outlet opening 70 in a series of
pulses. The inlet and outlet openings are so located as to yield a
pulsating flow as similar as possible to that from a piston-type
pump.
To survive the high pressure developed and the continued wear
imposed by the action of roller 72 in use, tube 80 preferably is
formed of an inner flexible tube 82, of rubber or deformable
plastic, covered by a sheath 84 braided from nylon or other
highly-durable fibers. To save expense, however, tube 80 of such
composite form preferably is limited in length to that which
accommodates placement within cavity 66 so as to project outwardly
from respective inlet opening 68 and outlet opening 70 only a
somewhat minimum extent. At its inlet end, tube 80 is sealingly
secured upon one end of a conventional nipple 86 engagable at its
other end portion with a flexible plastic tube 88. As illustrated,
the remote end of tube 88 is secured by a slip fit upon a
conventional fitting 90 insertable through the typical stopper 92
provided in a bottle 94 containing the irrigating solution to be
utilized. Such solution, for example, may be sterilized water or of
a saline nature. At its other end, tube 80 is joined to a flexible
tube 96, typically of plastic, by a clamp 98. To insure proper
placement within cavity 66 of tube 80, clamp 98 is locatingly
received within a recess 100 formed as part of outlet opening
70.
A door 102 is hinged at one side of boss 64 so as to close in
overlying relationship to cavity 66 and in containment of tube 80.
Door 102 is maintained in its closed and overlying relationship by
a thumbscrew 104 threaded into the adjacent portion of boss 64.
When desired, an electrical switch may be positioned so as to be
operated by closure of door 102 or locking of thumbscrew 104. The
switch is connected in series with motor 32 in order to prohibit
energization when door 102 is open. To permit direct visual
observation by the user of proper insertion and alignment of tube
80 between roller 72 and the inner wall of cavity 66, door 102 is
formed of a transparent material such as polycarbonate. As part of
the hinging mechanism for door 102, boss 64 includes an elongated
outwardly-projecting lug 106 in which are defined recesses 108 that
accept ears 110 integrally projecting from the main panel of door
102. Respective pins 112 extend lengthwise through lugs 106 and
ears 110 so as to support door 102 in a swingable manner.
Coupled to the end of tube 96 remote from tube 80 is a nozzle
assembly 114. Assembly 114 includes a valve 116 and a valve
operator 118. Valve operator 118 is manually adjustable so as to
permit control of the rate of fluid flow through tube 96 as well as
selectively to cause cessation of such fluid flow.
In more detail, valve 116 preferably is molded and machined from a
suitable plastic so as to include an inlet nipple 120 upon which
the corresponding end of tube 96 is sealingly received, together
with an inlet conduit 122 leading from nipple 120 to a valve seat
124. Beyond seat 124 is an interior barrel 126 through which is
received a valve stem 128 carrying at its inner end a valve point
130 that is movable against seat 124 so as to effect valve clousre
as well as flow regulation. Valve operator 118, on the inner end of
which valve point 130 is formed, is threadably received within the
bore of barrel 126 as indicated at 131, the engagement being
sealingly completed by an O-ring 132 that encircles the inner end
portion of operator 118. An outlet conduit 134 terminates at its
inner end in ports which communicate with a valve chamber 136
immediately beyond valve point 130. Valve operator 118 is also
formed at the outlet end of conduit 134 to include a fluid coupling
138 sealed by an O-ring 139 to a hollow stem 140 projecting
rearwardly from a nozzle head 142.
Binding the entire nozzle assembly together is a continuous strap
144, which may be formed either of metal or plastic and which is so
bent as to define a barrel portion 146 in which valve operator 118
is contained and a handgrip portion 148 that depends downwardly
from the rear end vicinity of barrel portion 146 and from which
tube 96 emerges at the bottom. Strap 144 is so formed as to leave
user access to valve operator 118 on both lateral sides of valve
assembly 114. Moreover, the exterior lateral surface of valve
operator 118 preferably is knurled. Accordingly, the user is able
to grasp nozzle assembly 114 in the manner of pistol and need only
to utilize his thumb and forefinger in order to attain complete
valving control and operation. Completing the mechanical structure,
strap 144 is secured to the block in which seat 124 is defined by
means of screws 150.
In use, the operator installs and, if necessary, interconnects and
intercouples tubes 80, 88 and 96 together with the supply such as
bottle 94 and nozzle assembly 114. At least normally, all of these
components will have been sterilized. Switch 60 is then thrown to
its energizing position, and operation of roller 72 is observed
through transparent door 102 in order to insure that proper pumping
action is occurring. The user then need only grasp nozzle assembly
114 in one hand with which he is able both to stop and start the
flow of liquid altogether as well as to vary the flow rate by
manipulation of valve operator 118. The user's other hand may be
left entirely free for the purpose of manipulating instruments or
the relative position or exposure of the area being treated with
the pulsating fluid. Because complete flow control is included in
nozzle assembly 114, the operator does not have to have access to
the pumping unit. Therefore, the latter does not have to be
sterilized and may be positioned out of the sterile field. In a
successful adaptation, shaft 36 of motor 32 rotates at twelve
hundred revolutions-per-minute. Adjustment of valve operator 118
permits the delivery of the liquid at a rate variable between zero
and about twelve-hundered milliliters per minute. Adequate
ventilation within housing 22 is secured by selecting gears 42 and
44 so that fan 46 is rotated at a speed of three times that of
shaft 36.
It is contemplated that all portions of lavage 20 exclusive of the
different tubing and nozzle assembly 114 are of heavy-duty, durable
construction. While tube 80 is made to have sufficient durability
so as to withstand the pressure and pumping action imposed by
roller 72, even that tubing as well as tubing 88 and 96 together
with nozzle assembly 114 are designed as throw-away items. While,
indeed, they may be re-sterilized after a given usage, it is at
least often more economical to discard them following their use in
connection with a particular patient.
While a particular embodiment of the invention has been shown and
described, it will be obvious to those skilled in the art that
changes and modifications may be made without departing from the
invention in its broader aspects, and therefore, the aim in the
appended claims is to cover all such changes and modifications as
fall within the true spirit and scope of the invention.
* * * * *