|Publication number||US3084691 A|
|Publication date||Apr 9, 1963|
|Filing date||Nov 4, 1960|
|Priority date||Nov 4, 1960|
|Publication number||US 3084691 A, US 3084691A, US-A-3084691, US3084691 A, US3084691A|
|Inventors||Stoner George H|
|Original Assignee||Air Shields|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (1), Referenced by (40), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
April 9, 1963 G. H. STONER 3,084,691
ASPIRATOR Filed Nov. 4, 1960 2 Sheets-Sheet 2 INVENT ATTORNEYS 3,084,69i ASPIRATOR George H. Stoner, Warminster, Pa., assigner to Air- Shieids, lne., Hatboro, Pa., a corporation of Delaware Fiied Nov. 4, 1969, Ser. No. 67,354 12 Claims. (Cl. 12S-278) This invention relates to a device for purging foreign matter from a cavity in an object, more particularly the invention relates to an aspirator for sucking iluids, such as mucus, blood, vomit, etc., from the mouth, nasal passages and throat. The invention is particularly well suited Afor emergency rescue operations because it is lightweight, readily portable, and easy and relatively foolproof in operation.
The invention is in the nature oi an improvement to the type of aspirator having, assembled on a portable carrier, a foot-operated bellows pump, a receptacle for aspirated iluid, and a length of flexible tube adapted for insertion into the mouth of the patient.
An important object or the invention is the provision of an aspirator which is exceptionally well suited for emergency rescue operations because its component parts are securely mounted for maximum portability and serviceability while at the same ti-me being readily demountable for cleaning purposes.
A further object of the invention is the provision of an aspirator having visible guides to the proper assembly and -use of the various parts, such visible guides making it possible for even an inexperienced operator to quickly and accurately assemble and operate the unit under emergency conditions.
Another important object of the invention is the provision of an aspirator of the kind described which is outstanding for lits ease of manufacture, as well as its ease of assembly, disassembly and cleaning. In this connection it is noted that an object of the invention is the provision of `a main plate in the form of a single sheet of material, preferably metal, which is bent so that it serves the function of carrier, mounting board, positioner for the aspirated huid receptacle, guard to prevent accidental damage by mislocation of the Ifoot of the operator, handle, and holder for the aspirating tube when it is not in use.
Other objects and advantages of the invention will be clear from the yfollowing description referring to the accompanying drawings in which:
FIGURE `1 is a side elevation taken partly in section and partly broken away, the View being generally along the line 1-1 of FlGURE 2 and showing an assembled aspirator according yto the invention;
FIGURE Z is a plan View of the aspirator shown in FIGURE l, with parts of the assembly broken away for the sake of clarity;
FlGURE 3 is an isometric view of the main plate of the invention and certain associated fittings;
FIGURE 4 is a fragmentary elevational View of the base portion of the bellows pump of the invention;
FIGURE 5 is a fragmentary plan section taken generally along the line 5-5 of FIGURE 4; and
FGURE 6 is an elevation simi-lar to FIGURE 4 but showing the .pump misassembled so that the locating pins abut the top of the main plate instead of protruding through the locating holes.
Describing the equipment first in general terms, the main plate M positions and supports the foot pump P, the receptacle R for aspirated fluids and the tube T which extends '.from the unit for insertion into the fluid to be aspirated, the tube T terminating in a nozzle -N for this purpose.
Foot pump P comprises a rubber bellows member 7 mounted in upright position, within which two springs Eddi-,dgl Fatented Apr. 9, 1963 ice 8 and 9 are located. Top end plate 10 and bottom end plate 11 include circular flanges 12 and 13, respectively, which fit within the end corrugations i4 and 15, respectively, ofthe bellows 7.
Annular flange lr6 projects downwardly from the underside of end plate l0 and serves to locate the end coils of springs 8 and 9. Depending collar y17 provides an interior air flow passage 1S interconnecting the space 19 within the bellows and the valve chamber 20 in the counterbore 21 in the upper side of end plate 10. The valve chamber 20 is sealed by top cover plate 22 which tits within the enlarged counterbore Z3 and is held in position in any convenient manner, for example by means of screws 24. A series of radial holes 25 provides communication between .the Valve chamber 20 and .the atmosphere. A wire cage 26 contines fiap valve member 27 which in the closed position rests against the valve seat ZS.
The lower end plate 1l is similar to the upepr end plate 10 and has an annular ilange 29 which positions the bottom end coils oit springs S and 9, and a central collar 30 having a bore 3l therein. Flow passage 32 interconnects bore 31 and ythe nipple tube connector 33 projecting out of the side of downwardly projecting cylindrical wall 34 depending from end plate 11.
Chain 35 extends between pins 36 and 37 in the upper `and lower end plates and contines the upward extension of the springs `and bellows. By this means the springs can be preloaded or precompressed prior to the assembly of the bellows so that the upward pumping stroke proceeds at a substantially uniform and rapid rate throughout the entire extent thereof, as permitted by chain 35.
To operate the pump, the operator places a foot on the top ring-like surface 38, in which position the operators foot spans the cover plate 22. Thus the pumping force is applied `axially against surface 38 which is part of the relatively heavy member 10, rather than directly against the much thinner plate 22. Downward motion of the operators foot comprises the springs and bellows. At the bottom of the downward stroke the operator either removes his foot, or, preferably, eases the downwardly yapplied force, and the springs then return the bellows to extended position.
Intermediate tube 39 interconnects nipple 33 and the receptacle R through a specially constructed connecting device 40. The connecting device 40 is in the form of a main body portion 41 having a bore 42 therein. Tubular connector 43 is inserted into the bore in tight frictional contact with the walls of the bore until shoulder member 44 abuts the end of the body 4l. A nosek portion 45 protrudes outwardly from the bore.
ln the opposite end of the body portion 4i, a nipple tube connector 46 projects through the wall of the body member and into bore `42. Tube 39 is slipped over nipple 46. The inner end 47 of the nipple member projects well into the bore 4Z. A ball 48 acts as a check valve in the interior ow passage through the member 4i). In the lower or closed position the ball 4S rests on seat 49 provided in the upper end of the connector 43. The ball 43 is prevented from seating over the passage in the inner end 47 of the nipple 46 by reason of the extension of the end 7 into the path of travel of the ball in the bore 42, the extension 47 protruding into the bore far enough to prevent the ball 48 from passing up the bore 42 beyond the end 47.
As seen in FIGURE 2, a spare connector Sii, constructed in the same manner as connector 4%, is provided in the event that the connector 40 becomes clogged during use. Since the connector 5'@ is normally not used, its tube connecting nipple 51 is provided with a rubber cap 52. to prevent ingress and egress of air.
The receptacle R comprises an upwardly open cup member 53 which is conveniently made of a plastic material, such as polyethylene. The upper edge of the cup 53 has an outwardly projecting iiange 54 which forms a lip for cooperation with the inwardly projecting lip 55 provided in the cover member 56. The cover 56 is conveniently made of rubber with an `annular groove 57 provided to accommodate the upper edge of the cup 53.
As shown, the outboard wall 58 of the groove 57 slopes inwardly and the outboard wall 59 of the lip 5@ slopes outwardly. These sloped surfaces 53 and 59 cooperate during assembly of the cover 56 on the cup 53. luring assembly, the cover is rst rested on the top edge of the cup :with a portion of the top edge protruding part way into the groove in the cover and with the sloping surfaces 58 and 59 in engagement with each other. Pressing down on .the cover results in an `outward bending of the peripheral wall 60 of -the cover until the opposed lips 54 and 55 of the cup and cover are opposite each other, at which point the lip 55 snaps under the lip 54 and the cover is thereupon held snugly to the cup.
To disassemble the cover from the cup, the operator grips the underportion of the wall eti at any point around the periphery of the cup and pulls outwardly and upwardly. As a result the wall `all distorts outwardly to release the lip 55 from engagement under the lip 54. It will be seen that the interengaging parts provided make possible a quick and easy assembly and disassembly of the cover and cup while still providing an ethcient and effective fluid seal between the members.
The tubular member 45 protruding from connector 40 passes through an aperture 61 in the lid 56 and into the interior 62 of the cup 53. A similar tubular member 45a (see FIG. 2) depends from the connector 56 and passes through a similar hole in the cover into the interior 52. A third hole l63 is provided through the cover and it is through this hole -63 that the tubular connector 64 secured to the aspirating tube 65 protrudes.
The aspirating tube 6.5 ,terminates in a nozzle N suitable for insertion into the mouth and throat of a patient. A short transparent section of tubing `56 is preferably provided adjacent the nozzle to facilitate visual observation of the passage of aspirated fluids.
The main plate or carrier member M is conveniently formed from a single sheet of metal and performs a number of separate functions. The plate M includes a base run 70 generally rectangular in plan, an upstanding spacer run 7l extending upwardly from an end of the base run 70, a support run 72 generally parallel to the base run 70 and extending from the upper edge of the spacer run 71 substantially horizontally over a portion of the base run 70, and an upstanding handle run 73 extending upwardly from the inner edge of the support run 72.
The handle run 73 lserves -several functions. An aperture 74 is provided in the upper portion thereof, which aperture is large enough to form a linger grip for carrying the aspirator. In addition, the Vertical run 73 forms a protecting wall between the bellows pump portion of the mechanism and the receptacle and tubing portion. By this means the receptacle is protec-ted from Contact by the foot of the operator during pumping operation of the pump.
Still further, a specially formed slot 75 is provided in the upper edge of run 73, this slot having a narrower neck 76 at the top thereof formed by protruding ears 77 and 78, so that several runs of tubing 65 can be forced through the neck '76 and will then be retained in the groove 75. With this arrangement, as seen in FIGURE 1, the tubing 65 for use in aspirating can conveniently and securely be stored near the top of the-unit, ready for quick disassembly and use,
A reinforcing post 67 is provided and secured in position by means of screws 68 and 69. Post 67 extends between and reinforces base run 79 and support run 72.
The. tubing 39 interconnecting connector it? and the base of the bellows pump passes through a grommet 79 provided in an aperture in the support run 72 of the main i plate. The aperture Sti in the support run is large enough to conveniently accommodate the cup 53. The edge walls of the aperture di) assist in maintaining the cup 53 in upright position and therefore guard against accidental dislocation of the cup.
At the bottom thereof the cup 53 has a lug 3l which protrudes through an aperture $2 in main plate 7i) and serves to orient and position the base of the cup 53 with respect to the main plate.
A plurality of rubber-support pads 63 are conveniently held in Iplace by screws 84 and project downwardly from base plate 7i) so as to support the unit on whatever surface may be available.
The bellows pump is secured in place by means of a screw type clamp means S5 which screws in the block 86 secured to the main plate 70 by means of screws 87. The screw S5 has a turning pin 88 passing through an aperture in the end thereof. The inner end 89 of the screw S5 abuts the support ring 34 depending from the underside of lower end plate l1. Also depending from the underside of plate l1 are two positioning lugs 9i and 92 which are accommodated by apertures 93 and 94 through the main plate 7i). Positioning posts 95 and 96 are held in place by screws 97 and 98, the heads of which form outwardly projecting llanges which abut the outer surface of the support ring 34.
The locating pins 9i and 92 are spaced apart a distance less than the diameter of ring 34 and are positioned, with respect to clamp screw SS so as to provide reaction points against motion of the screw in clamping direction. The posts and 96 are similarly spaced and positioned. Since the pins 91 and 92 protrude through main plate 75l, they provide reaction points in the plane of the main plate. The posts 95 and 96 provide, by means of flanges 97 and 9S, reaction points in a plane substantially above the plane of base plate 70.
Therefore, by using both the pins and the posts, reaction points are provided in two spaced planes, and this contributes to the firmness with which the base of the bellows pump is gripped by the clamp device.
The pins 91, 92 and the posts 95, 96-are positioned, with respect to the tube connecting nipple 33 so that, when the pump unit is properly positioned on the base plate, the tubing 39 will not be kinked or sharply bent in interconnecting the nip-ple 33 and either of the connectors 40 and 50.
As an added safety feature, the pins 91 and 92 are of suiiicient length to make it quite ditlcult to clamp the pump in an incorrect position with the pins resting on the base plate 7i) instead of protruding through the apertures provided. Such an incorrect position `s indicated in FIGURE 6. As there seen, the clamp screw 85 cannot securely fasten the pump in position because it lacks a solid abutment against the support ring 34.
The lower edge of the support ring may be chamfered as shown at 99 as an added safety device so that the clamp screw 8S will abut only a sloping surface, rather than a ilat surface, if the screw is advanced against the support ring when the ring is in an incorrect position.
During depression of the bellows pump by the foot of the operator, the ball 48 is seated on the valve seat 49 and thus occludes flow from the bellows or tubing 39 into the receptacle R. At the same time the ap valve 27 opens and the fluid within the bellows can pass outwardly through the apertures 25 to the atmosphere. When the springs and bellows are all the way depressed, the operator eases up on the foot pressure applied so that the springs return the bellows to the upward position.
During the upward stroke the flap valve 27 is seated tightly against the valve seat 2S and occludes any inflow through the apertures 25. During this phase of the cycle the ball 48 leaves its seat and iiuids are sucked out of the receptacle R through the tube 39 and into the bellows. Such suction results in the application of suction through the tubing 65 and thus results in the application of an aspirating force at the nozzle end.
Repetition of the foot pumping of the bellows pump thus provides an intermittent suction force at the nozzle end. Fluids aspirated from a patients throat are lodged in the receptacle R. lf it should happen that the receptacle fills with liquid, no interference with the pumping occurs since the liquid is merely conveyed through tubing 39 into the interior of the bellows and from there proceeds outwardly through the holes 25. It is thus not necessary to interrupt a rescue operation in order to empty the receptacle R.
Attention is now directed to an important aspect of the invention. As best seen in FIGURE 2, lthe lid 56 of the cup S3 and the top cover 22 of the bellows pump are provided with special indicia assisting the operator in the proper assembly and use of the aspirator. Top plate 22 of the pump unit includes a representation of a human footmark 100 indicating that it is at that position that the operator is to place his foot.
A representation of a human face 1011 appears on the cover 56 and is oriented so that the tubing 65 protrudes from the point at which the mouth of the face would normally appear. This instructs the operator that it is at this point that the tube for aspirating is to be connected and that it is the tube here projecting that should be inserted into the patients mouth.
Also pictured on the lid 56 is a representation 102 of the bellows pump together with arrows 103 and 104 and associated numerals 105 and :106. The numerals are adjacent the connectors 40 and 50 and the arrows indicate that the tube from the base of the bellows can be connected to either the connector 40 or the connector 50. The representation 102 thus instructs the operator that either connector 40 or connector 50 can be interconnected with the foot pump by means ofthe tubing 39.
The provision of the pictorial indices 100, 101 and 102 is of substantial importance from several points of view. In the iirst place, instructions not provided by this means, but rather provided in the usual way by means of a printed circular or brochure, can easily be separated from the unit and might not be available when an emergency arises.
Furthermore, such printed instructions are relatively` time consuming to read and master and require that the operator be able to read the language in which the instructions are given.
It is further noted that when an emergency rescue operation is to take place, an operator is often unable to take calm, deliberate and careful action. Near-panic conditions often prevail. At such times it is of extreme importance that the invention provide for an instantaneous and substantially foolproof guide for the correct assembly and use of the aspirator.
ln this connection it is mentioned that the aspirator may have been left unassembled by the last person to use it and it is thus of considerable importance that the unit be quickly and easily assembled to proper working condition. Such assembly at times takes place when an emergency has already arisen.
When an emergency rescue operation is completed, the
parts are readily cleaned. The tube 65 can be removed from the unit by applying an upward force to connector 64 passing through the cover 56. Each of the fittings 40 and 50 can be similarly disconnected from the cover by pulling them upwardly. The tubing 39 may be disassembled from the fitting '40 and from the nipple 43 by applying a pulling force thereto. The cup 53 may easily be lifted out of the unit and the cover 56 removed so that the cup can be cleaned.
If the cup IS3 has been filled with aspirated liquid and additional liquid has been sucked into the inside of the bellows, the bellows can be cleaned by pumping while the nozzle N is immersed in clean water, the pumping being continued until clean water flows out of the apertures 25.
The nozzle N should be sterilized so that it is ready for the next use. Since the flow never goes from the unit to the patient, but always in the opposite direction, it is not necessary to sterilize any of the parts except the nozzle.
It is seen that the invention provides an aspirator which is not only portable but exceptionally convenient and easy to operate and maintain. The unit is able to Witllstand subjection to quite rough treatment because all of the parts are substantially unbreakable and are secured in their proper relative positions quite positively.
The main plate is strikingly easy to manufacture since it is composed of a single sheet of metal bent and apertured as described. This main plate performs a number of functions. It is a carrier for the parts of the aspirator. It is a mounting board and serves to maintain the parts in their proper relative positions. `It serves to keep the receptacle from accidental spillage. It serves to protect the receptacle and associated parts from the foot of the operator. It includes a linger grip for use in carrying the unit, and it provides a holder to hold the aspirating tube when it is not in use.
l. In an -aspirator unit of the kind having -a foot-operable pump, a receptacle for aspirated fluids, and an aspirating tube, the aspirator unit having `an interconnecting tube with one end in communication with the suction side of the pump and the other end provided with disengageable attachment means, the receptacle including a tir-st aperture cooperating with the attachment means of the interconnecting tube, one end of the aspirating tube including attachment means, a second aperture in the receptacle cooperating with the attachment means on the aspirating tube, the other end of the aspirating tube being free for insertion into the fluid to be aspirated, the improvement comprising a representation of a human footmark on that portion of the pump :against which the foot of the operator is applied to operate the pump, a representation of a human `face on said receptacle oriented so that the second aperture composes the mouth thereof, and a representation of the pump on said receptacle adjacent the tirst aperture, whereby an operator of the aspirator unit is pictorially guided in the assembly and operation of the aspirator.
2. A portable aspirator for use in laspirating iiuids from the mouth comprising: a foot-operable bellows pump, a receptacle foraspirated fluids, conduit means interconnecting the receptacle and the suction side of the pump, and a carrier member, the receptacle having a iiexible tube extending therefrom and :adapted for insertion into the mouth, the carrier member .being formed of a unitary sheet of metal and having a .base run, an upstanding spacer run extending upwardly from an end of the base run, a support run generally parallel to the base run and extending from the upper edge of the spacer run over a portion of the base run, and an upstanding handle run extending upwardly from the edge of the support run which overlies the base run, the support run being apertured to accommodate the receptacle for aspirated fluids, said receptacle Ibeing positioned to rest on the base run of the carrier and protrude upwardly through the aperture in the support run, whereby the aperture provides for positioning of the receptacle with respect to the carrier and for maintenance of the receptacle in upright position, said bellows pump being mounted on the base run on the portion thereof not overlaid by the other runs of the carrier member, the handle run extending upwardly beyond the upper end of the bellows pump in position to protect the receptacle from contact with the foot of an operator during pumping operation of the pump, an aperture in the upper portion of the handle run of the carrier member, which aperture is large enough to provide a finger grip for carrying the aspirator, at least one of the spacer, support and handle runs being provided with a slot extending inwardly from an edge thereof and adapted to accommodate a plurality of folds of the tube manually wedged therein, a representation of a human footmark on the top surface of the bellows pump, andra representation of a human face on the receptacle, which face is positioned so that the tube protrudes from the receptacle at the point on said face at which the mouth `would normally appear.
3. A construction according to claim 2 in which the bellows pump includes a support member at the base thereof, said support member being adapted to'rest on the upper surface of the carrier member, tllc support member including a plurality of projecting locating pins and the carrier member including a like number of locating apertures, the locating apertures being positioned and sized to accommodate the locating pins, the carrier member further including clamp means vadapted `for manual adjustment between a loose position `and a clamp position, the clamp means in the clamp position lbeing adapted to abut the support member and urge the support member toward a position in which the locating pins contact the edges of the locating apertures and provide reaction points, in the plane of the carrier member, to continued application of clamping pressure, `and the clamp means in the loose position providing for upward removal of the bellows pump and support ring.
4. A construction according to claim 3 and further including a plurality of locating posts extending upwardly from the carrier member, each post having abutment flange means extended parallel to and spaced above the upper surface of the carrier member and positioned to engage the support member in a plane substantially above the carrier member when the clamp means is in the clamp position.
5. A construction according to claim 4 in which the clamp means comprises an abutment member mounted for extension and retraction in a plane above the carrier memlber but below vthe plane of engagement of the ange means, the clamp means in the extended position engaging the support member and urging same -away from the clamp means, and the clamp means in the retracted position being retracted out of contact with the support member, and in which construction the locating pins project from the lowermost surface of the support member a `distance at least as great as the distance `from the upper surface of the carrier member to the plane of extension and retraction of the clamp means.
`6. A construction according to claim 5 in which the support member has a cylindrical exterior surface, and in which the lowermost edge of the support member is chamfered below the level yat which the clamp means abuts the support member when the support member is in assembled position, whereby, when the bellows pump and support member are misassembled sov that the locating pins rest on the carrier member instead of protruding through the locating apertures, the clamp means will, upon extension, impinge upon the chamfered portion of the support member.
7. A construction yaccording to claim 2 in which the conduitmeans includes an intermediate tube extending betweenthe bellows pump andthe receptacle for aspirated iluids, and in which a representation of the bellows pump is provided on the receptacle adjacent said interconnecting tube.
8. A con-struction according to claim 2 in which the receptacle includes a positioning pin projecting from the bottom thereof, land in which thevbase run of the carrier member includes a positioning aperture sized and positioned to accommodate the positioning pin, whereby the lower end of the receptacle is maintained in desired position with respect to the carrier member.
9. A construction according to claim 2 in which the receptacle comprises a cup having an outwardly projecting flange around the upper edge thereof, Iand a cover member for the cup, said cover member being composed of resilient material Iand having an annular groove adapted to accommodate said flange on the upper edge of the cup, `said )groove including an inwardly projecting flange adapted to project inwardly beneath the flange on the cup when the cover member is in assembled position on the cup.
I 10. A construction according to claim 9 in Awhich the flange on the cup and the groove in the cover member include complementary and cooperating frusto-conical surfaces, whereby axial relative motion of the cup and cover member toward each other will result in sliding contact between said frusto-conical surfaces until the ange on the cover member snaps over the ilange on the cup.
ll. A construction according to claim 7 in which the intermediate tube is connected -to the receptacle by means of a fitting including a ball check valve adapted to permit flow from `the receptacle to the pump and to prevent flow `in the opposite direction, the tting comprising a housing member having a cylindrical bore extending part way therethrough, a hollow nipple member projecting yaxially out of said bore and through an aperture in the receptacle, and a second hollow nipple member extending through the wall of the fitting body substantially at right langles to the axis of the bore, the free end of said second nipple member being adapted tc interiit with an end of the intermediate tube, a baJ-l valve member within the bore 'and `a ball seat on the inne-r end of the iirst nipple member, the second nipple member projecting into the bore and intothe path of travel of the ball valve member, whereby to limit the travel of the lball valve member in `direction olf of the valve sea-t.
12. A carrier vfor 1a portable aspirator having a bellows pump, a receptacle for aspirated fluids, conduit means interconnecting the receptacle and the suction side of the pump, and a flexible aspirating -tube extending from the receptacle, the carrier comprising a main plate constructed of a single Asheet of relatively rigid material bent and configured to provide a plurality :of runs in relative posit-ions such` that the main plate serves as ya mounting board for the elements of the aspirator, a portable carrier for said elements, a .guard to prevent laccidental tipping over of the receptacle, a guard to prevent the operation of the bellows pump from interfering with the functioning of the other parts, a handle to facilitate manual carrying of the unit, yand a retainer for holding the aspirating tube when it is not in use.
References Cited in the file of this patent UNITED STATES PATENTS 2,947,470 Ruben et al. Aug. 2, 1960
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2947470 *||Feb 25, 1957||Aug 2, 1960||Holger Hesse||Aspirating apparatus|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3376868 *||Jun 4, 1964||Apr 9, 1968||Howe Sound Co||Surgical evacuator device|
|US3561429 *||May 23, 1968||Feb 9, 1971||Eversharp Inc||Instrument for obtaining a biopsy specimen|
|US3646935 *||Aug 21, 1969||Mar 7, 1972||Medical Dev Corp||Fluid collection systems|
|US3685517 *||Sep 18, 1970||Aug 22, 1972||Voys Inc Le||Aseptic disposable drainage receiver|
|US3742952 *||Apr 28, 1971||Jul 3, 1973||Alpha Ind Inc||Surgical suction pump assembly|
|US3809087 *||May 17, 1973||May 7, 1974||Lewis R||Closed wound suction apparatus having biased plate members|
|US4026284 *||Aug 29, 1975||May 31, 1977||Boehringer John R||Pressure relief valve for anesthetic administration|
|US4319570 *||Jan 29, 1981||Mar 16, 1982||Ruth Lea Hesse||Tracheal suction pump designed primarily for aspiration purposes|
|US4392860 *||Dec 8, 1980||Jul 12, 1983||Howmedica, Inc.||Disposable wound drainage device|
|US4460354 *||Jul 8, 1980||Jul 17, 1984||Snyder Laboratories, Inc.||Closed wound suction evacuator|
|US4529402 *||Feb 21, 1984||Jul 16, 1985||Snyder Laboratories, Inc.||Closed wound suction evacuator with rotary valve|
|US4578060 *||Jul 20, 1983||Mar 25, 1986||Howmedica, Inc.||Wound drainage device|
|US4643719 *||Jul 19, 1984||Feb 17, 1987||Garth Geoffrey C||Manually operable aspirator|
|US4775366 *||Sep 2, 1986||Oct 4, 1988||Richard Rosenblatt||Aspirator for collection of bodily fluid|
|US4925447 *||Jun 22, 1988||May 15, 1990||Rosenblatt/Ima Invention Enterprises||Aspirator without partition wall for collection of bodily fluids including improved safety and efficiency elements|
|US4950247 *||Jun 22, 1988||Aug 21, 1990||Rosenblatt/Ima Invention Enterprises||Aspirator for collection of bodily fluids including improved safety and efficiency elements|
|US4981473 *||Feb 1, 1990||Jan 1, 1991||Rosenblatt/Ima Invention Enterprises||Aspirator without partition wall for collection of bodily fluids including improved safety and efficiency elements|
|US6261276 *||Apr 12, 1996||Jul 17, 2001||I.S.I. International, Inc.||Apparatus for draining surgical wounds|
|US7160273||Aug 28, 2001||Jan 9, 2007||Medela Ag||Suction pump|
|US8007257||Oct 15, 2007||Aug 30, 2011||Kci Licensing Inc.||Reduced pressure delivery system having a manually-activated pump for providing treatment to low-severity wounds|
|US8287507||May 1, 2009||Oct 16, 2012||Kci Licensing, Inc.||Reduced pressure indicator for a reduced pressure source|
|US8535283 *||Feb 8, 2008||Sep 17, 2013||Kci Licensing, Inc.||System and method for applying reduced pressure at a tissue site|
|US8641692||Jul 9, 2009||Feb 4, 2014||Kci Licensing, Inc.||Manually-actuated, reduced-pressure systems for treating wounds|
|US8679079||Aug 9, 2011||Mar 25, 2014||Kci Licensing, Inc.||Reduced pressure delivery system having a manually-activated pump for providing treatment to low-severity wounds|
|US8864748||May 1, 2009||Oct 21, 2014||Kci Licensing, Inc.||Manually-actuated reduced pressure treatment system having regulated pressure capabilities|
|US9028458 *||Aug 22, 2013||May 12, 2015||Kci Licensing, Inc.||System and method for applying reduced pressure at a tissue site|
|US9511176 *||Mar 12, 2013||Dec 6, 2016||Wen Ching Lee||Homecare suction device|
|US20040024360 *||Aug 28, 2001||Feb 5, 2004||Andy Greter||Suction pump|
|US20080200905 *||Feb 8, 2008||Aug 21, 2008||Keith Patrick Heaton||System and method for applying reduced pressure at a tissue site|
|US20090254066 *||May 1, 2009||Oct 8, 2009||Keith Patrick Heaton||Reduced pressure indicator for a reduced pressure source|
|US20090275922 *||May 1, 2009||Nov 5, 2009||Richard Daniel John Coulthard||Manually-actuated reduced pressure treatment system having regulated pressure capabilities|
|US20100030166 *||Jul 9, 2009||Feb 4, 2010||Aidan Marcus Tout||Manually-actuated, reduced-pressure systems for treating wounds|
|US20130338614 *||Aug 22, 2013||Dec 19, 2013||Kci Licensing, Inc.||System and method for applying reduced pressure at a tissue site|
|US20140180205 *||Mar 12, 2013||Jun 26, 2014||Wen Ching Lee||Homecare suction device|
|US20140188061 *||Dec 13, 2013||Jul 3, 2014||Kci Licensing, Inc.||Recharging negative-pressure wound therapy|
|EP0355199A1 *||Oct 4, 1988||Feb 28, 1990||ROSENBLATT/IMA INVENTION ENTERPRISES (a joint venture formed under the laws of the State of California)||Aspirator for the collection of bodily fluids|
|EP1184042A1 *||Aug 28, 2000||Mar 6, 2002||Medela AG||Suction pump|
|WO1994021312A2 *||Mar 9, 1994||Sep 29, 1994||Life Support Products, Inc.||Portable medical vacuum aspiration device|
|WO1994021312A3 *||Mar 9, 1994||Nov 24, 1994||Life Support Products Inc||Portable medical vacuum aspiration device|
|WO2002017992A1 *||Aug 28, 2001||Mar 7, 2002||Medela Ag||Suction pump|
|U.S. Classification||604/134, 215/309|