Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1261—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing the rollers being placed at the outside of the tubular flexible member
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
  • A61M1/80—Suction pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
  • A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
  • A61M1/92—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing with liquid supply means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1276—Means for pushing the rollers against the tubular flexible member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1284—Means for pushing the backing-plate against the tubular flexible member
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/06—Venting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2210/00—Working fluid
  • F05B2210/10—Kind or type
  • F05B2210/11—Kind or type liquid, i.e. incompressible
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S417/00—Pumps

Definitions

• the present invention is directed toward venting an aspiration path in a peristaltic pump after an unacceptably high vacuum level is reached and in particular to air venting.
• an occlusion of the aspiration path may occur.
• a piece of tissue such as a piece of cataract
• the surgical hand piece such as a phacoemulsification instrument
• a vacuum level in the aspiration path begins to rise. If the occlusion is not timely removed the vacuum level may become dangerous, in that after the occlusion is removed, there may be an excessive surge through the aspiration path causing the eye to collapse and the intraocular pressure (IOP) in the eye to suddenly and dramatically drop. This can cause serious damage to the eye.
• IOP intraocular pressure
• FIG. 1 is a partial perspective of a peristaltic pump in accordance with the present invention
• FIG. 2 is the pump of FIG. 1 with a pump cartridge inserted into a drawer of the inventive pump
• FIG. 3 is the same view as FIG. 2 with a portion of the cartridge removed
• FIG. 4 is the same view as FIG. 3 with the drawer closed and the pump head in a tubing engaged position
• FIG. 5 is similar to the view of FIG. 4, except the pump head has been moved to a tubing vent position
• FIG. 6 is a partial block diagram showing the use of a peristaltic pump in accordance with the present invention connected to a surgical console and in use during surgery
• FIG. 1 is a partial perspective of a peristaltic pump in accordance with the present invention
• FIG. 2 is the pump of FIG. 1 with a pump cartridge inserted into a drawer of the inventive pump
• FIG. 3 is the same view as FIG. 2 with a portion of the cartridge removed
• FIG. 4 is the same view as FIG. 3 with
• FIG. 7 is an exploded perspective view of an inventive peristaltic pump cartridge in accordance with the present invention
• FIG. 8 is a perspective view of a pump cartridge in accordance with the present invention
• FIG. 9 is an elevation of a portion of a pump cartridge in accordance with the present invention
• FIG. 10 is an exploded perspective view of a portion of a pump cartridge in accordance with the present invention
• FIG. 11 is a partial cut-away view showing a collection bag assembly in accordance with the present invention
• FIG. 12 is a perspective view of a fitment of FIG. 11 without the collection bag attached
• FIG. 13 is a perspective view of an alternative embodiment of a fitment in accordance with the present invention
• FIG. 14 is a partial cut-away view with the fitment of FIG.
• FIG. 1 shows a partial perspective view of a peristaltic pump 10 for use in ophthalmic surgery, in accordance with the present invention.
• a housing 12 includes a pump head 14 having a plurality of rollers 16 held within and extending from the housing 12.
• a backing plate 18 is attached to the housing 12 and cooperates with the pump head 14 to pinch a length of tubing between the rollers 16 and backing plate surface 20.
• Pump head 14 moves relative to the housing 12 and the backing plate 18, as described in detail below.
• pump head 14 is shown in an open position and ready for the insertion of a pump cartridge, as described below.
• Pump head 14 is preferably connected to a motor (not shown) and the pump head 14 causes rollers 16 to rotate about a central axis 22 of the pump head 14, such that the rollers 16 and the backing plate 18 cooperate to compress or pinch a length of surgical tubing and peristaltically pump fluids from a surgical site through the tubing to a collection bag, as described in further detail below.
• Pump head 14 preferably moves or translates in a straight line towards and away from the backing plate 18.
• Pump head 14 can be made to move by any manner known to those skilled in the art, such as by pneumatic or hydraulic pistons, or stepper motors, or other known means.
• pump head 14 may include various numbers of rollers 16, depending on the desired head 14 size and the performance requirements to be obtained.
• Peristaltic pump 10 preferably further includes a cartridge- holding drawer 24 for insertion of a pump cartridge, as shown in more detail below.
• pump 10 further includes a pressure transducer interface 26 and spring housing 28 for urging a pressure transducer and a pump cartridge against pressure transducer interface 26.
• FIG. 2 is similar to FIG. 1 with the addition of a pump cartridge 30 inserted into cartridge drawer 24.
• Pump cartridge 30 includes a housing with an upper portion 32 including a handle 34 for assisting a user in inserting and removing the cartridge 30 from drawer 24.
• Pump cartridge 30 of FIG. 2 is shown without a collection bag in order to reveal further details of the cartridge 30 and pump 10.
• the collection bag typically hangs from hooks 36 in front of the drawer 24.
• Aspirant fluids and tissue flows through fitment or barb 38 to the collection bag (not shown) for collecting fluids and tissue from a surgical site.
• the cartridge housing, including upper portion 32 is formed of a molded plastic material, such as acrylonitrile- butadiene-styrene (ABS) or other suitable material.
• ABS acrylonitrile- butadiene-styrene
• irrigation line 40 Connected to pump cartridge 30 is an irrigation line 40, which is typically connected to a bottle or bag of balanced salt solution (BSS) (not shown). Irrigation line 40 is then connected to fluid venting conduit or tube 42 and to a second irrigation line 44 which extends across pump cartridge 30, as shown in further detail below to provide for a control valve, typically a pinch valve (not shown), that opens and closes irrigation line 44. Irrigation line 44 is then connected to a further length of tubing 46 that ultimately is connected to a surgical handpiece, such as a phacoemulsification (phaco) handpiece or other irrigation device for use in ophthalmic surgery. An aspiration line 48 is also connected to pump cartridge 30 which carries aspirant from a surgical handpiece.
• FIG. 3 is similar to FIG.
• pump head 14 moving or translating relative to the housing 20 is that when the pump head 14 is in an open position, as shown in FIG. 3, the surgical tubing 50 is easily inserted between the pump head 14 and the backing plate 18. Pump head 14 should be in a position, such that the loop of tubing 50 easily clears pump head 14. When door or drawer 24 closes and pump head 14 translates from the open position, shown in FIG. 3, to an operative or closed position, shown in FIG.
• the rollers 16 and the backing plate surface 20 cooperate to compress the tubing 50 to peristaltically pump aspirant from a surgical site through the tubing 50 and 48. Aspirant flows through tube 48 to tube 50 and out barb 38 to a collection bag not shown.
• the pump head 14 is moved toward the backing plate 18, such that the rollers 16 and the backing plate surface 20 cooperate to peristaltically pump aspirant through the length of tubing 50 as the pump head 14 is rotated.
• Additional tubing 48 is typically connected to a surgical aspiration device, such as a phacoemulsification handpiece for peristaltically pumping aspirant through the tubing from a patient's eye during surgery.
• a surgical aspiration device such as a phacoemulsification handpiece for peristaltically pumping aspirant through the tubing from a patient's eye during surgery.
• a surgical aspiration device such as a phacoemulsification handpiece for peristaltically pumping aspirant through the tubing from a patient's eye during surgery.
• FIG. 5 shows the pump 10 in an air vent position, which is yet another inventive aspect of the present invention.
• FIG. 5 is different from the open position of FIG. 3 and the operative position of FIG. 4, in that the pump head 14 is in a position intermediate of those positions shown in FIGs. 3 and 4. That is to say, pump head 14 has been moved away from backing plate 18 a sufficient distance to allow tubing 50 and 48 to be air vented upon the occurrence of an occlusion.
• a surgeon experiences an occlusion in the aspiration line 48 or at the tip of his phaco handpiece, he will typically activate a button on a control panel, release a foot pedal (both not shown), or trigger a software control, causing pump head 14 to momentarily move away from backing plate 18, as shown in FIG.
• FIG. 6 shows a block diagram of the pump 10 in use with an ophthalmic surgical system, such as the MilleniumTM System available from Bausch & Lomb.
• the system typically includes pump 10 incorporated into a control console 52, which controls the operation of pump 10.
• FIG. 6 also shows irrigation line 40 connected to an irrigation source, such as BSS bottle 54.
• irrigation line 40 and aspiration line 48 to the ophthalmic surgical handpiece 56 is shown.
• Handpiece 56 is typically a phaco device inserted into eye 58 for removing a cataract 60 or for performing other ophthalmic surgery.
• This simple method of air venting the aspiration line enables a vacuum to be quickly and efficiently removed from the aspiration path defined by a handpiece 56, aspiration tubing 48, and the aspiration tubing loop 50.
• the prior art uses a pinch valve associated with a short section of tubing open to the atmosphere at one end and connected to the aspiration line on the other end.
• One aspect of the present invention by using the advantage of the moveable pump head, allows for the elimination of the prior art pinch valve for air venting (thus, reducing costs of manufacture) and allows the venting to occur in a very short time period.
• FIG. 7 is an exploded perspective view of pump cartridge 30.
• Pump cartridge 30 includes a molded housing 62 including upper portion 32 with handle 34.
• Hooks 36 preferably hold collection bag 64 via openings 66.
• aspiration line 48 also passes through an opening 68 for connection to the pump housing 62 at barb 70.
• Collection bag 64 is preferably formed of a flexible, liquid-tight material for collecting aspirant from a surgical site through barb 38.
• collection bag 64 is formed of a co-layer of nylon and polyethylene to provide for a strong, yet inexpensive bag that can be easily connected to a fitment, as described in detail below.
• Collection bag 64 is more precisely a collection bag assembly 64 because attached to collection bag 64 is a fitment described in detail below.
• collection bag 64 could also be other types of containers such as a rigid cassette, or a bottle, or other reservoir suitable for collecting aspirant from a surgical site. It is also preferred that collection bag 64 be large enough to hold aspirant from a typical surgery on at least one eye. As is known in the prior art, it is preferred that aspirant line 48 be as non-compliant as possible, that is, as stiff and rigid as possible to prevent and minimize the collapse of tubing 48 upon the occurrence of an occlusion and the build-up of vacuum in the aspiration path. Housing 62 also preferably includes openings 71 and 72 to allow for operation of pinch valves (not shown), as is well known in the art.
• Opening 72 is associated with irrigation line 40 and 44.
• a pinch valve of pump 10 passes through opening 72 and causes the opening and closing of irrigation tubing 44 to control the flow of BSS through irrigation line 40 and 46 to a handpiece not shown.
• End 74 of irrigation line 40 is typically connected to a BSS bottle as previously shown in FIG. 6.
• End 76 of aspiration line 48 and end 78 of irrigation line 46 are typically connected to a surgical handpiece, such as a phaco handpiece for use in surgery.
• FIG. 8 shows a perspective view of the pump cartridge 30 fully assembled, including irrigation line 40, fluid venting line 42, irrigation lines 44 and 46, aspiration line 48, and collection bag 64.
• FIG. 9 is an elevation view of an opposite side of the cartridge 30 and housing 62 from that shown in FIGs. 7 and 8.
• Pump loop 50 is shown with one end 82 connected to the collection bag via barb 38 and the other end 84 connected to both aspiration line 48 and diaphragm pressure transducer assembly 80.
• Pressure transducer 80 preferably detects the pressure in aspiration line 48 and tubing 50 by deflection of the diaphragm 90 (separately shown is FIG. 10).
• Diaphragm 90 deflects to indicate a change in pressure.
• Diaphragm 90 may deflect as much as 5 thousandths of an inch at 550 mmHg (millimeters of mercury).
• housing 62 includes tube holders 84 molded into the housing for holding the lengths of tubing within the cartridge, as shown in FIG. 9.
• Irrigation line 42 and opening 71 cooperate with a pinch valve not shown to fluidly vent pressure transducer 80 when commanded by console 52.
• the pinch valve operates to control the flow of irrigation fluid to the pressure transducer 80.
• a high vacuum is typically caused by an occlusion occurring within the eye being operated on when the aspiration port of the surgical handpiece is closed off or occluded by tissue. As the occlusion happens, the pump head 14 continues to attempt to pump aspirant through the aspiration path and into collection bag 64.
• the tubing loop 50 may be air vented by the movement of the pump head.
• tubing 50 may also be air vented by the movement of the backing plate, though this is not shown.
• the movement of backing plate 18 away from pump head 14 will also allow tubing 50 to become unpinched and therefore, vent air from the collection bag 64 to relieve the vacuum that has been created in aspiration line 48 and the surgical handpiece.
• the prior art teaches fluid venting by venting fluids to the aspiration line 48; however, the most compliant portion of the aspiration path and that portion which displaces the most volume is the pressure transducer 80.
• Pressure transducer 80 is preferably connected between a handpiece 56, as shown in FIG. 6, and a collection bag or reservoir 64. This allows the pressure transducer 80 to provide a user, through the pressure transducer interface 26, with an accurate reading of the pressure being experienced in the aspiration path.
• Pressure transducer 80 is preferably similar to that described in U.S. Patents 5,746,719 and 5,753,820, although other types of pressure sensors may also be used such as other diaphragm sensors or piezo-electric sensors.
• FIG. 10 shows an exploded perspective view of the housing 62 and some of the components connected to the housing 62.
• pressure transducer 80 includes an internal volume portion 86 molded into housing 62.
• pressure transducer 80 preferably, includes an o- ring 88 for fluidly sealing a diaphragm 90 to the internal volume portion 86 via snap ring 92, which is held in housing 62 via arms 94.
• FIG. 10 also shows the connection of fluid venting conduit or tubing 42 to the pressure transducer 80.
• FIGs. 1 1 - 14 show two (2) embodiments of an inventive fitment for attachment to collection bag assembly 64.
• FIG. 1 1 is a partial cutaway view of an inventive collection bag 64 and fitment 98 for use with the pump cartridge 30.
• Fitment 98 is preferably an elongated connector attached to collection bag 64 and connects to cartridge 62 at fitment or barb 38 as shown. Fitment 98 has opposing ends.
• a first end is structured for attachment to the pump cartridge 30 and the second end is positioned within the interior of bag 64.
• Collection bag 64 may be sealed to fitment 98 by prior art means, such as adhesive.
• fitment 98 is preferably formed of a polyethylene material similar to that forming a layer of collection bag 64 and in this manner, collection bag 64 may be heat-sealed to fitment 98, such that no adhesive is required to form a liquid-tight seal between the bag and the fitment. This results in the elimination of toxic adhesives and provides a simpler, more efficient means of attaching fitment 98 to collection bag 64. It is possible to form fitment 98 and collection bag 64 of materials other than polyethylene.
• Fitment 98 provides a conduit for aspirant flow from the pump cartridge 62 to an interior of the bag 64.
• a further inventive feature of fitment 98 is best shown in the perspective view of FIG. 12, and is notched portion 100. As can be seen in FIG. 11 , notched portion 100 ensures that as a vacuum is pulled through the aspiration path as explained above, the collection bag 64 cannot completely collapse around the opening in fitment 98 to seal-off fitment 98.
• This notch 100 ensures that a sufficient amount of air will be contained within collection bag 64 to vent any inappropriately high vacuum level that has built up in the aspirant path, including tube 50, pressure transducer 80, or aspiration line 48.
• the prior art typically relied on the use of some spacer member to be inserted within bag 64, such as a piece of foam or resilient wiring.
• the provision of the notch 100 in fitment 98 allows for the elimination of the foam or other spacer elements within bag 64 and therefore, provides for a cheaper more efficiently manufactured collection bag than possible in the prior art.
• FIGs. 13 and 14 show an alternate embodiment of the notched fitment of FIGs. 11 and 12.
• FIG. 13 shows the formation of opposing notches 102 within a fitment 104.
• Fitment 104 also preferably includes an attachment ring 106 that provides a convenient flat surface for attaching bag 64 to fitment 104 via heat sealing as described above.
• Fitment 104 is also constructed to mate with barb 38 and is also preferably formed from polyethylene, as described above.
• the fitments 98 and 104 allow the collection bag 64 to be removed from cartridge 30 during surgery. This is highly desirable because a collection bag 64 may fill up prior to the end of surgery and changing collection bags is more efficient and less expensive than placing a new cartridge into the pump 10.
• the inventive air venting can still be utilized by simply momentarily relieving the strain on the stretched loop of tubing to remove the pinch points created by the pump head rollers.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Hematology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• External Artificial Organs (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (3)

Families Citing this family (62)

Citations (6)

Family Cites Families (53)

• 2003
  • 2003-09-29 US US10/673,859 patent/US7168930B2/en not_active Expired - Lifetime
• 2004
  • 2004-09-02 CN CNB2004800281194A patent/CN100436820C/zh not_active Expired - Lifetime
  • 2004-09-02 KR KR1020067006021A patent/KR101096403B1/ko not_active Expired - Lifetime
  • 2004-09-02 WO PCT/US2004/028507 patent/WO2005033511A1/en not_active Ceased
  • 2004-09-02 JP JP2006528016A patent/JP4653099B2/ja not_active Expired - Lifetime
  • 2004-09-02 EP EP04782906A patent/EP1668250A1/en not_active Withdrawn
  • 2004-09-02 CA CA2538937A patent/CA2538937C/en not_active Expired - Lifetime
  • 2004-09-02 AU AU2004278677A patent/AU2004278677B2/en not_active Expired

Patent Citations (6)

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