U.S. patent number 3,823,724 [Application Number 05/364,184] was granted by the patent office on 1974-07-16 for controlling flow of medical fluids.
This patent grant is currently assigned to Med-Lab Computer Services, Inc.. Invention is credited to William P. Davis.
United States Patent |
3,823,724 |
Davis |
July 16, 1974 |
CONTROLLING FLOW OF MEDICAL FLUIDS
Abstract
Medical pinch valve assemblies, networks, manifolds and related
methods, the assemblies comprising two or more pinch valves each of
which comprises an actuator, a spring-loaded plunger and a valving
arm which collapses an array of channel-contained medical tubing
with memory at a selected site to occlude flow of medical fluid
across the site. When open, the memory of the tubing and the
pressure of the medical fluid opens the previously occluded site to
permit flow. Hence, flow of medical fluid from source to
destination sites is facilitated. Only the tubing is sterilized and
tubing removal and replacement is rapidly achieved so that "down
time" is virtually non-existent.
Inventors: |
Davis; William P. (Salt Lake
City, UT) |
Assignee: |
Med-Lab Computer Services, Inc.
(Salt Lake City, UT)
|
Family
ID: |
23433416 |
Appl.
No.: |
05/364,184 |
Filed: |
May 25, 1973 |
Current U.S.
Class: |
137/15.01; 251/5;
251/61.4; 137/881; 251/14 |
Current CPC
Class: |
F16K
7/00 (20130101); F16K 27/00 (20130101); Y10T
137/0402 (20150401); Y10T 137/87861 (20150401) |
Current International
Class: |
F16K
7/00 (20060101); F16K 27/00 (20060101); F16k
031/145 () |
Field of
Search: |
;251/5,14,61.4
;137/15,561,608,315,612.1 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Klinksiek; Henry T.
Attorney, Agent or Firm: Foster; Lynn G.
Claims
What is claimed and desired to be secured by United States Letters
Patent is:
1. A pinch valve assembly for controlling the flow of medical
fluids comprising:
a non-sterile body;
a groove in the surface of said body;
a sterile disposable pliable tube of synthetic material having
memory disposed at least in part in the said surface groove;
a non-sterile stem;
means mounting the stem within said body for (a) lineal
reciprocation between extended and retracted positions and (b)
rotational displacement between functional and nonfunctional
positions;
means normally biasing the stem into one of said two lineal
positions;
force-applying means displacing the stem into the other of said two
lineal positions counter to said bias;
an arm carried by the stem and juxtaposed the groove when the stem
is in the functional rotational position such that the arm pinches
the tube closed against the body groove to prevent fluid flow
through the tube when the stem is in a first of said two lineal
positions, and the arm releases the tube to accommodate the flow of
medical fluid through the tube when in the second of said two
lineal positions;
means rotataionally displacing the stem and arm to the
nonfunctional rotational position whereby the tube, after it
becomes contaminated, may be readily removed from the groove and
replaced in the groove by another sterile tube, following which the
stem and arm are returned to their functional rotational
position.
2. The assembly of claim 1 further comprising a removable cover
plate substantially covering the groove and having a slot adjacent
the arm to accommodate said lineal reciprocation.
3. The assembly of claim 1 wherein said biasing means comprise a
force-applying spring.
4. The assembly of claim 1 wherein said displacing means comprise a
fluid driven diaphragm.
5. The assembly of claim 1 wherein said displacing means comprise
solenoid means.
6. A medical flow control assembly comprising:
a non-sterile L-shaped actuator;
a non-sterile body carrying the actuator for lineal reciprocable
movement along the axis of one leg of the actuator, said body
having an open groove passageway with a base and side edges normal
to and juxtaposed the other leg of the actuator;
a length of sterile disposable medical tubing for communicating
medical fluid from one site to another site removably located in
the passageway, the depth of the base of the groove being
substantially less than the diameter of the medical tubing;
non-sterile means normally biasing the other leg of the actuator
away from the tubing allowing substantial unimpeded flow of medical
fluid between said sites through the open bore of the medical
tubing and non-sterile means for displacing the other leg of said
actuator counter to said bias against the tubing and the body
juxtaposed the side edges of the groove occluding the tubing by
flattening without crushing the same a distance equal to the
diameter of the tubing less the depth of the groove, whereby flow
of medical fluid through the tubing is accommodated and prevented,
respectively.
7. A medical flow control manifold comprising;
an array of sterile tubing of biologically inert plastic material
having memory, for electively communcating medical fluid between
one site and at least two other sites, said array comprising at
least one connector whereby one length of tubing from the one site
is joined to at least two other lengths of tubing respectively
connecting to said other two sites;
body means having an array of interconnected open surface grooves
each comprising a base with side walls into which said array of
tubing is correspondingly placed in contiguous relation with the
base;
a plurality of separate slots in the surface of the body means,
each slot comprising a base and intersecting one of said surface
grooves but having a depth less than the depth of the intersected
groove;
a tube-occluding arm disposed in each slot across the groove and
adjacent the branch of tubing in the groove;
an actuating piston connected to each tube-occluding arm and
associated with the body means for limited reciprocation of the
connected arm against and away from the base of the associated slot
adjacent branch of tubing to occlude by flattening without crushing
the adjacent tubing or accommodate opening of the tubing
respectively thereby respectively preventing and permitting flow of
medical fluid in said branch;
a plurality of automated means each associated with the body means
and each respectively moving one actuating piston and associated
tube-occluding arm between the reciprocable positions thereof
whereby flow of medical fluid across the connector between selected
sites in the branches of the tubing is facilitated.
8. The manifold of claim 7 wherein said plurality of automated
means are normally positioned to cause the associated
tube-occluding arm to occlude the adjacent branch of tubing.
9. The manifold of claim 7 further comprising a cover plate
positioned over and covering said surface grooves and intersecting
slots.
10. A manifold as defined in claim 9 wherein said cover plate
comprises elongated openings accommodating reciprocation of each
tube-occluding arm.
11. a medical flow control manifold comprising;
an array of sterile tubing of biologically inert plastic material
having memory, for selectively communicating medical fluid, said
array comprising at least one connector whereby one length of
tubing is joined to at least two other lengths of tubing;
body means having an array of surface grooves each comprising a
base into which said array of tubing is correspondingly placed in
contiguous relation with the base;
a plurality of slots in the surface of the body means, each slot
intersecting one of said surface grooves;
a tube-occluding arm disposed in each slot away from the base of
the groove and adjacent the thick branch of tubing in the
groove;
an actuating piston connected to each tube-occluding arm and
associated with the body means for limited reciprocation of the
connected arm against and away from the adjacent branch of tubing
to occlude or accommodate opening of the tubing respectively
thereby respectively preventing and permitting flow of medical
fluid in said branch;
a plurality of automated means each associated with the body means
and each respectively moving one actuating piston and associated
tube-occluding arm between the reciprocable positions thereof
whereby flow of medical fluid across the connector between selected
branches of the tubing is facilitated;
means exposed beyond the body means and connected to each actuating
piston for manual displacement of the associated tube-occluding arm
from its slot and rotation thereof out of superimposed relation
with the adjacent surface groove whereby the disposable tubing,
once contaminated, may be readily removed and replaced by a like
array of tubing in sterile condition.
12. A method of controlling flow of medical fluid comprising the
steps of:
placing disposable sterile tubing in an open surface groove of a
non-sterile pinch valve with an eccentrically disposed
tube-occluding arm superimposed over the tubing;
actuating the eccentrically disposed tube-occluding arm of the
pinch valve between occluding and non-occluding positions by remote
control to selectively pass and prevent passage of medical fluid
across the valve from a source site to a destination site;
preventing, at a site remote from the pinch valve, fluid flow in
the tubing across the pinch valve;
positioning the tube-occluding arm out of superimposed contiguous
relation with the tubing;
disconnecting the used tubing in respect to said source and
destination sites;
removing the used tubing from the surface groove and discarding the
same;
replacing the used tubing with new sterile tubing in said groove
and in connected relation between the source and destination sites
without sterilization of the pinch valve
returning the tube-occluding arm for displacement between the
occluding and non-occluding positions.
13. A method of controlling fluid flow of medical fluid comprising
the steps of;
placing an array of disposable sterile tubing comprising
interconnected branches in an arrangement of open surface grooves
in a non-sterile body;
actuating selected ones of a plurality of tubeoccluding arms, each
comprising part of a pinch valve, respectively, between a stop
engaging tube flattening but not crushing occluding position and a
non-occluding position by remote control to selectively channel
medical fluid from source to destination sites through selected
tube branches;
preventing, at one or more sites remote from the body, fluid flow
in any branch of the tubing;
disconnecting the used array of tubing in respect to said source
and destination sites;
removing the used array of tubing from the arrangement of surface
grooves;
replacing the used array of tubing with a new array of sterile
tubing positioned in said arrangement of grooves and connected
between said source and destination sites, without sterilization of
the body and pinch valves.
Description
BACKGROUND
1. Field of Invention
The present invention relates generally to flow control of medical
fluids and more particularly to a novel pinch valve assembly and
manifold for selectively controlling flow of medical fluid,
together with related methods.
2. Prior Art
In the past, medical valves and valve networks have been unduly
expensive. Complete and repeated sterilization has been needed to
assure absence of contamination, often because medical fluid was
allowed to come in contact with the valve itself. Fluid flow has
been difficult to ascertain. Occasionally ports, seals or sliding
members of prior art valves and valve networks have tended to clog,
damage or entrap fluid or permit leakage. Selective fluid flow
control has been less than precise and substantial amounts of time
have been lost while a given used valve network was being
conditioned for subsequent utilization.
BRIEF SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The present invention provides an economical novel medical pinch
valve assembly or manifold, together with related methods, the
assembly comprising a non-sterile body having grooves or channels
receiving sterile tubing in a readily removable fashion. One or
more actuators in selected locations are selectively controlled to
occlude or not occlude the tubing at one or more predetermined
sites to control flow of medical fluid from source to destination
sites. Used tubing can be speedily removed and replaced by
additional sterile tubing of like type and configuration without
need for sterilizing the assembly per se. Fluid flow is easily
determined, no fluid contact with valve parts occurs and seals are
not required. Fluid damage and entrapment does not occur.
With the foregoing in mind, it is a primary object of the present
invention to provide a novel medical pinch valve assembly or
manifold and related methods.
It is a further object of considerable importance to provide a
medical pinch valve assembly for selectively controlling fluid flow
between source and destination sites which is economical and which
accommodates prompt exchange of sterile tubing without the
necessity of sterilization of the valve per se.
It is another paramount object of the present invention to provide
a novel medical pinch valve manifold which selectively controls the
flow of medical fluid, which flow is visible at all times.
It is an additional object of the present invention to provide a
novel medical pinch valve manifold and method for accommodating
selective displacement of the medical fluid without causing the
fluid to contact valve components and which does not damage or
entrap the medical fluid or permit leakage thereof.
These and other objects and features of the present invention will
be apparent from the following detailed description, taken with the
reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side cross-sectional view of a presently preferred
medical pinch valve of assembled components in its normally closed
condition;
FIG. 2 is a side cross-sectional view of the medical pinch valve
assembly of FIG. 1 in its actuated, "open" condition;
FIG. 3 is a cross-sectional view of a second presently preferred
medical pinch valve assembly embodiment according to the present
invention;
FIG. 4 is a top plan view of a pinch valve manifold embodying three
pinch valve assemblies shown in operable condition;
FIG. 5 is a top plan view similar to FIG. 4 showing the three pinch
valve assemblies positioned so as to permit ready removal of the
disposable tubing comprising the assembly;
FIG. 6 is a perspective representation of the manifold of FIG. 4
shown in its assembled, ready to use condition; and
FIG. 7 is an exploded perspective of the manifold of FIGS. 4 and
6.
DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
Specific reference is now made to the drawings, wherein like
numerals are used to designate like parts throughout. FIG. 1
illustrates one presently preferred pinch valve, generally
designated 10, according to the present invention. The medical
pinch valve 10 comprises a main body portion 12 and a pneumatic
influent body portion 14. The body portion 14 comprises a male
projection 16 having a linear passageway or actuating port 18
concentric with the axis of the medical pinch valve 10. The male
projection 16 comprises external serrations 20, adapted to receive
a flexible pneumatic tube whereby air under pressure is delivered
to and exhausted from the valve 10.
Interposed between the main body portion 12 and the end body
portion 14 is a diaphragm 22, the periphery 24 which is rigidly
held in sealed relation between the portions 12 and 14 The central
portion of the diaphragm 22 is permitted to flex within a
counterbore recess 26 located at the base of the body portion 12.
Counter bore 26 merges with intermediate counterbore 28 and
intermediate counterbore 28 in turn with axial bore 30 of the body
portion 12. A valve stem or plunger 32 is movably retained in
sealed relation within the bore 30 so that it may appropriately
axially reciprocate upon pneumatic command any may be manually
rotated by use of knurled exposed end 34.
A transverse arm 36 is rigidly secured to the stem 32 at location
38 so that at all times the arm 36 moves with the stem 32. In all
circumstances, the arm 36 is exposed above the body portion 12. In
a normally closed position of FIG. 1, the arm rests upon the base
surface 40 of a surface slot 42. In the actuated "open" position of
FIG. 2 the arm is elevated completely out of the slot 42 away from
the base 40 thereof.
The stem at its interior concealed end 44 is attached to a
concentric disc 46, the bottom surface of which is bonded or
otherwise caused to adhere to the top surface of the diaphragm 22.
Thus, the disc 46 and the diaphragm 22 move together.
A return spring 50 abuts against the shoulder 52 of the
intermediate counterbore 28 and against the top surface of the disc
46 exerting sufficient force so as, in the absence of pneumatic
pressure on the underside of the diaphragm 22, the stem 32 and arm
36 will be held in the down, "closed" position shown in FIG. 1.
The body portion 12 at its top surface is covered by cover plate
56. The cover plate 56 is appropriately secured to the body 12 by
screws or the like, not shown, so that the plate 56 may be removed
as desired. A slot 58 extending through the entire thickness of the
plate 56 accommodates axial reciprocation of the arm 36 as the stem
32 moves between the positions of FIGS. 1 and 2, but at the same
time prhibits, in the illustrated embodiment under consideration,
rotation of the arm 36. When the plate 56 is removed, the user may
grip the knurled end 34 and rotate the arm 36 out of superposition
over the slot 42. The need for a cover plate is eliminated if the
stem travel from the closed to the open position is less than the
depth of slot 42, thereby inherently preventing rotation of the
stem 32.
A channel or open groove 60 exists in the top surface of the body
portion 12 and extends transverse of the slot 42, crossing the slot
42 about midway along its length. A flexible pliable medical tubing
62, having memory and a diameter approximately twice the depth of
the slot 60, rests in the slot 60 along the bottom or base thereof.
Preferably, the plate 56 and the tubing 62 are transparent so that
one may readily observe the flow of medical fluid along the tubing
62.
As can be observed from FIGS. 1 and 2, the arm when in the normally
closed position compresses the tube 62 so as to fully occlude the
same, but at the time does not crush or cause structural damage to
the tube. In the open position of FIG. 2, the tubing 62 is shown as
being fully open to accommodatefluid flow, the tube being displaced
from the occluded to the open condition due to the memory of the
material comprising the tubing 62 and pressure of the fluid in the
tubing.
It is intended that the valve 10, with the exception of the tubing
62 be nonsterile. Initially, the tubing 62 will be sterile and,
following use, may be readily replaced by merely removing the cover
plate 56, manually lifting the stem by knurled end 34 and rotating
it out of superposition over the tubing 62, removal of the tubing
the replacement of the same with new, sterile tubing. When
appropriately assembled, air under pressure is introduced from a
suitable source through the passage 18 of the portion 14 causing
the valve stem 32 and arm 36 to elevate to the position of FIG. 2
thereby selectively passing medical fluid through the tube 62. When
pressure from the source is removed, an exhaust mode prevails and
the force of spring 50 will evacuate air on the underside of the
diaphragm 22 causing the pinched valve to move from the position of
FIG. 2 to that of FIG. 1.
Reference is now made to a second presently preferred embodiment of
the present invention illustrated in FIG. 3 and generally
designated 70. The pinch valve 70 is shown on its side, but it is
to be appreciated that it may be oriented in any desired fashion.
The portions of the valve 70 which correspond to the valve 10 have
been given identical numerals and no further description will here
be presented. Only the differences will be described. The valve 70
comprises the central body portion 12', previously mentioned, the
cover plate 56 and an end body portion 14'. The end portion 14' is
secured to the body portion 12' by cap screws 72 or the like. A
push type solenoid 74 extends into a central bore at threads 76 in
portion 14' at 78 and is there secured. Thus, the portion 14'
comprises a solenoid mounting plate. An armature-actuated plunger
80 projects from opening 76 into counterbore 28' of the valve body
12'. The plunger 80 contiguously engages the bottom surface 82 of a
bearing plate 84 at the distal end 86. The abutment plate 84 forms
an integral part of the valve stem 32'. The upper surface 88 of the
plate 84 is engaged by return spring 90, which also engages and
bears against shoulder 52' of counterbore 28. The operation of the
embodiment 70 of FIG. 3 is fundamentally the same as the operation
of the embodiment of FIGS. 1 and 2, pinch valve 70 being
illustrated in its non-actuated position (normally closed) in FIG.
3. Thus, when the solenoid 74 is energized, the plugner 80 is
extended, thereby displacing the stem 32' to the right and opening
the medical tubing 62 for flow of medical fluid from a source to a
destination site.
Reference is now made to FIGS. 4 and 5 which illustate an array of
pinch valves of the type illustrated and described in connection
with FIGS. 1 and 2 and/or FIG. 3. While either valve 10 or 70 could
be used, for simplicity FIGS. 4 and 5 will be described in
connection with valves 10. It is intended that FIGS. 4 and 5
illustrate generally how the pinch valves according to the present
invention may be assembled into arrays. Obviously, many more than
three valves could be used depending upon the particular type of
medical fluid flow control desired. In the FIGS. 4 and 5 three
pinch valves 10 are illustrated having a single one-piece cover
plate 56' extending over all three as illustrated in the assembled
condition of FIG. 4. Screws 80 may be used to removably hold the
cover plate 56' to the three valves 10. The valves 10 comprise
surface grooves 60 arranged in a T configuration, when considered
as a whole. A T-shaped array of medical tubing 62' comprising
branches 82, 84 and 86. Said array of tubing is disposed in the
mentioned grooves 60 beneath the cover plate 56'. Each valve 10 is
normally closed (see FIG. 1) and, therefore, it can be appreciated
by reference to FIG. 4 that all of the valves may be "off" at any
particular time thereby preventing flow of the medical fluid in any
of the branches 82, 84 and 86. By the same token, the selective
actuation of the plungers or stems 32 of the three valves 10 can be
used to permit flow of medical fluid between any one branch to any
other branch.
Again, the present invention has as an objective the provision of
valve structure which does not require sterilization. Therefore, it
is contemplated that only tubing 62' would be initially sterile and
the valves 10 would not be subjected to sterilization processes.
Thus, when the tubing 62' has been used and is no longer
appropriate for continued use, the cover plate 56' is removed by
removal of screws 80. When the cover plate 56' is removed, the
valves 10 are exposed as illustrated in FIG. 5, following which the
tubing 62' is readily pulled from the grooves 60 and replaced by
like tubing.
It should be appreciated that other configurations in the form of
valve assemblies or arrays may be constructed using two or more
medical pinch valves in accordance with the present invention. In
this way, closed loop intravenous therapy, bypass and flushing
functions may be facilitated. The pinch valve bodies, cover plate
or plates, diaphragms, if diaphragms are used, and other components
may be of one-piece unitary construction or formed in separate
pieces. In any event, the valve actuators comprising plungers or
stems must be individually operable. To illustrate the foregoing,
the valve network embodiment of FIGS. 6 and 7 will now be
described. The valve network or manifold, generally designated 110
comprises a one-piece valve body 112. Three stepped bores 130,
configurated as are stepped bores 30 of FIGS. 1 and 2, are placed
in appropriate locations so as to extend parallel to the depth of
the valve body 112. The illustrated top surface of the valve body
112 contains U-shaped grooves or channels 160, each having a base.
Said grooves are shaped and located as groove 42 of FIGS. 1 and 2.
Three slots 142 extend transversely across the adjacent groove 160
and open into the adjacent stepped bore 130 as illustrated. In the
same fashion as described in connection with FIGS. 1 and 2 the
channel 160 is deeper into body 112 than the associated transverse
slot 142 by a distance equal to approximately the radius of the
transparent medical tubing 162 which is placed in the T-shaped
groove 160. As can be observed, the medical tubing 162 is T-shaped
also. The described depth difference between grooves 160 and slots
142 prevents damage to the tubing 162 when engaged by the arms 136
of the pinch valve network 110. Each arm 136, in a manner
previously described, is anchored non-rotatably to the associated
plunger or stem 132. Each stem 132 fits snugly but displaceably
within the smallest diameter portion of the stepped bore 130. Each
stem is biased as earlier described by a spring 150, which abuts a
shoulder of the stepped bore 130 anda disc 146, secured by a screw
147 to a threaded bore at the lower surface of the associated stem
132. A diaphragm 122 covers the enlarged, bottom opening of each
stepped bore 130 and is sealed to the underside of valve body 112
by an end cap 14, identical to the end cap 14 of FIGS. 1 and 2.
Each end cap 14 is secured by cap screws 123 to the underside of
body member 112, the screws 126 fitting into threaded blind bores
in the body 112.
The array of medical tubing 162 and the grooves 160 at the top
surface of the valve body 112 are covered by one-piece transparent
plate 156. The plate 156 is secured by countersunk screws 157 to
the body member 112 at threaded blind bores therein disposed in the
top surface. Three key-hole openings 136 in the plate 156
accommodate reciprocation of the plungers 132 while preventing
rotation of the same. Removal of the cover plate 156 accommodates
lifting and rotation of the plungers 132 whereby the array of
medical tubing 162, following use, may be removed and replaced by a
like array of tubing in sterile condition. Hence, sterilization of
the network 110, exclusive of the tubing, is avoided.
The invention may be embodied in other specific forms without
departing from the spirit or essential characteristics thereof. The
present embodiments are therefore to be considered in all respects
as illustrative and not restrictive, the scope of the invention
being indicated by the appended claims rather by the foregoing
description, and all changes which come within the meaning and
range of equivalency of the claims are therefore intended to be
embraced therein.
* * * * *