US20050214146A1 - Energy-saving anti-free flow portable pump for use with standard PVC IV tubing - Google Patents
Energy-saving anti-free flow portable pump for use with standard PVC IV tubing Download PDFInfo
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- US20050214146A1 US20050214146A1 US11/131,058 US13105805A US2005214146A1 US 20050214146 A1 US20050214146 A1 US 20050214146A1 US 13105805 A US13105805 A US 13105805A US 2005214146 A1 US2005214146 A1 US 2005214146A1
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- 239000012530 fluid Substances 0.000 claims abstract description 41
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 9
- 238000001802 infusion Methods 0.000 description 11
- 238000001990 intravenous administration Methods 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000004800 polyvinyl chloride Substances 0.000 description 6
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000881 depressing effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 231100000518 lethal Toxicity 0.000 description 1
- 230000001665 lethal effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Images
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
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
- F04B43/082—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
Definitions
- This invention relates to a pump for providing fluid for injection into a patient. More specifically it relates to a method and apparatus for an ambulatory infusion pump for pumping liquid through standard intravenous (IV) tubing.
- IV intravenous
- Infusion pumps for delivering fluid to a patient are well known in the art.
- Two general categories of infusion pumps known in the art are ambulatory pumps and large volume parenteral (LVP) pumps. These pumps deliver fluid to a patient through tubing at higher accuracies than gravity drip tubing delivery systems.
- LVP parenteral
- LVP pumps are relatively large infusion pumps that can provide a fluid to a patient for 4-6 hours or more on a single battery charge, or indefinitely from an AC power connection. They may operate on standard IV polyvinyl chloride (PVC) tubing. Most available LVP pumps completely collapse the PVC tubing during operation to ensure that there is no free flow to the patient or back flow to the fluid reservoir. This leads to very high power consumption when using standard tubing. Thus, a battery capable of powering the pump for 24 hours is very heavy and bulky. A patient receiving fluid from an LVP pump must stay within reach of a power cord, or push a wheeled stand with the LVP pump and battery mounted on it. In addition, fully collapsing the tubing deforms the tubing.
- PVC polyvinyl chloride
- the tubing cross section becomes more elliptical the longer the pump operates on it. Less fluid is discharged from the tubing as the cross section becomes more elliptical, leading to negative flow rate errors.
- the pump rate accuracy decays proportional to the amount of time an individual tubing set is used to deliver fluid to a patient.
- An example of an LVP infusion pump is shown in U.S. Pat. No. 4,653,987 (Tsuji et al.).
- Ambulatory pumps are smaller infusion pumps that can be attached to a patient's belt, allowing them to move around without a bulky LVP pump.
- LVP pump there are several drawbacks in comparison to the LVP pump.
- the reduced battery cannot provide the power required to completely collapse standard PVC tubing.
- many ambulatory pumps require the use of special dedicated IV sets, or special silicon tubing threaded through a cassette to be inserted into the pump. This specialized equipment increases the cost of using the pumps. Even with special dedicated IV sets or silicon tubing and cassettes, many ambulatory pumps can only provide fluid to a patient for a few hours on a single battery charge.
- Another problem with the infusion pumps currently in the art is the danger of free flow of fluid when the tubing is inserted or removed from the pump.
- An occluder is used to completely collapse the tubing while the tubing is outside the pump. The occluder is disengaged when the tubing is installed in the pump. The tubing is occluded again before the tubing is taken out of the pump.
- the tubing may accidentally become unoccluded while the tubing is outside the pump, allowing fluid to flow freely to the patient. This overdose of fluid may be harmful or even lethal.
- the present invention comprises an apparatus for pumping fluid through tubing.
- the apparatus includes a tubing base having a tubing support surface and a stop platen.
- the stop platen and the tubing support surface each comprise respective ridges aligned with a direction of fluid flow through the apparatus.
- the respective ridges are operatively arranged to engage a wall of tubing along a longitudinal axis of the tubing.
- the respective ridges are arcuate in a plane orthogonal to the direction of flow.
- the respective ridges are centered with respect to a transverse axis of the tubing and have a respective width less than an outside diameter of the tubing.
- the stop platen is arranged to be moved to a position closest to the tubing base and when the stop platen is in this position, the tubing is formed in first and second lobes.
- the lobes form passages through said first tubing.
- the lobes are symmetrical with respect to the longitudinal axis.
- the present invention also includes a method for pumping fluid through tubing.
- a general object of the present invention is to provide an ambulatory pump that utilizes standard PVC tubing.
- Another object of the present invention is to provide an ambulatory pump with high accuracy, preferably better than ⁇ 5% accuracy.
- FIG. 1 is a side view of a first embodiment of the present invention, with the platens arranged to allow fluid flow from a reservoir;
- FIG. 1 a is a perspective view of an occlusion platen
- FIG. 1 b is a perspective view of a pump platen with a stop platen thereon;
- FIG. 2 is a side view of a first embodiment of the present invention, with the platens arranged to allow fluid flow to a patient;
- FIG. 3 is a side view of a first embodiment of the present invention, with the platens arranged to pump fluid to a patient;
- FIG. 4 is a side view of a first embodiment of the present invention, with the platens arranged at the end of a pump cycle;
- FIG. 4 a is a cross sectional view of the tubing and the pump platen showing the dimensions of the stop platen and the tubing;
- FIG. 4 b is a cross sectional view of the tubing and the pump platen, with the stop platen completely collapsing a portion of the width of the tubing;
- FIG. 5 is a perspective view of an embodiment of the present invention.
- FIG. 6 is an exploded view of an embodiment of the present invention.
- FIG. 7 is an electrical schematic of the motor drive circuit of an embodiment of the present invention.
- FIG. 8 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing unoccluded;
- FIG. 9 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the occluder being inserted in the keyhole of the present invention;
- FIG. 10 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open;
- FIG. 11 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open, and the tubing installed in the pump;
- FIG. 12 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing installed in the pump;
- FIG. 13 is a front perspective view of an embodiment of the present arranged to pump fluid through the tubing
- FIG. 14 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention opened, and the tubing installed in the pump;
- FIG. 15 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open, and the tubing uninstalled from the pump;
- FIG. 16 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing occluded;
- FIG. 17 is a perspective view of a device of the present invention.
- FIG. 18 is an exploded view of the device shown in FIG. 17 ;
- FIG. 19 is a front perspective view of an occlusion platen shown in FIG. 18 ;
- FIGS. 20 and 21 are side views of a tube support plate and a pump platen.
- FIGS. 22-28 are side views of the device showing a sequence of operation.
- FIG. 1 A first embodiment of the present invention is shown in FIG. 1 and generally designated 10 .
- Apparatus 10 is an infusion pump comprising pump base 20 with tubing base 31 fixed thereto. Tubing 21 is routed over tubing base 31 underneath occlusion platens 22 and 29 , and pump platen 25 .
- Occlusion platen 22 is fixed to platen support 55 .
- Occlusion platen 29 is fixed to platen support 55 .
- Pump platen 25 comprises stop platen 26 , and is fixed to platen support 55 .
- Motor 42 is fixed to pump base 20 .
- Motor 42 drives camshaft 38 .
- Camshaft 38 is supported by shaft supports 40 and 41 .
- Cams 35 , 36 , and 39 are all fixedly mounted on camshaft 38 .
- Cam 35 is operatively arranged to cyclically drive occlusion platen 29 between a first, unoccluding position and a second, occluding position.
- the first position is shown in FIG. 1 , wherein occlusion platen 29 is not in contact with tubing 21 .
- platen support 55 is driven down by cam 35 . This drives occlusion platen 29 towards tubing 21 .
- Occlusion platen 29 is driven to a second position, shown in FIGS. 2, 3 , and 4 , where occlusion platen 29 occludes tubing 21 .
- cam 35 moves away from platen support 55 .
- Spring 52 shown on FIGS. 5 and 6 , provides upward force on platen support 55 to lift occlusion platen 29 back to the first, unoccluded position.
- Cam 39 drives occlusion platen 22 through a similar cycle.
- Occlusion platen 22 is driven from a first, unoccluded position to a second, occluded position.
- occlusion platen 22 occludes tubing 21 at substantially different times than occlusion platen 29 .
- Occlusion platen 22 is shown occluding tubing 21 in FIGS. 1 and 4 .
- Spring 52 shown on FIGS. 5 and 6 , provides upward force on platen support 55 to lift occlusion platen 22 back to the first, unoccluded position when cam 39 moves away from platen support 55 due to the rotation of shaft 38 .
- Cam 36 drives pump platen 25 from a first position to a second position as shaft 38 rotates.
- the first position is shown in FIGS. 1, 2 , and 4 a .
- the pump platen is not in contact with tubing 21 .
- width d of stop platen 26 is less than width w of tubing 21 .
- cam 36 drives platen support 55 to a second position, shown in FIGS. 3, 4 , and 4 b .
- pump platen 25 depresses tubing 21 .
- Stop platen 26 completely collapses a section of the width of tubing 21 , as shown in FIG. 4 b . Stop platen 26 prevents pump platen 25 from occluding tubing 21 .
- Stop platen 26 does not occlude tubing 21 because stop platen 26 is narrower than tubing 21 , as shown in FIG. 4 a . Occlusion by the pump platen is undesirable because it would require significantly more power than partially occluding the tubing, as shown in FIGS. 3, 4 , and 4 b . Further, the tubing does not deform as readily when partially deflected by the pump platen, as compared to the deformation caused by occluding the tubing.
- the platens are spring loaded, to allow the platens to be overdriven. This ensures tubing 21 is occluded by the occlusion platens or partially occluded by the stop platen, regardless of the dimension of tubing 21 . This improves the accuracy of the pump when using tubing of varying dimensions. Otherwise expensive, complicated measurement devices are needed to ensure that the tubing is deflected the appropriate amount by each platen. Springs 52 , shown in FIGS. 5 and 6 , accomplish this spring loading.
- stop platen 26 is a platen that extends the length of the pump platen, and is centered along the width of the pump platen.
- the stop platen could extend only a portion of the length of the pump platen, or it could be located away from the center of the pump platen.
- a stop platen shorter than the pump platen could be off center along either the length or width of the pump platen, or both.
- FIG. 1 shows platen 22 occluding tubing 21 , and platens 25 and 29 above tubing 21 .
- FIG. 2 shows platen 29 occluding tubing 21 , and platens 22 and 25 above tubing 21 . This position allows fluid to flow to a patient (not shown) in flow communication with end 12 of tubing 21 .
- FIG. 3 shows platen 29 occluding tubing 21 , platen 25 depressing tubing 21 until stop platen 26 completely collapses the central portion of the width of tubing 21 , and platen 22 above tubing 21 .
- FIG. 4 shows platens 22 and 29 occluding tubing 21 , and platen 25 depressing tubing 21 until stop platen 26 completely collapses the central portion of the width of tubing 21 . This is the end of the cycle. Platens 25 and 29 move up again to return to the first configuration of the pump cycle shown in FIG. 1 .
- FIGS. 1-6 show a single pump platen 25 .
- a plurality of pump platens may be used, and these configurations are intended to be within the spirit and scope of the invention as claimed.
- FIG. 1 a is a perspective view of occlusion platen 29 .
- FIG. 1 b is a perspective view of pump platen 25 with stop platen 26 thereon.
- FIG. 5 is a perspective view of an embodiment of the present invention, designated 50 .
- FIGS. 1-4 show motor 42 mounted in line with camshaft 38 so that the platens are visible.
- an embodiment locates the motor parallel to the camshaft, coupling them with gears 45 as shown in FIGS. 5 and 6 .
- FIG. 6 is an exploded view of an embodiment of the present invention in perspective.
- Springs 52 provide an upward force on the platen supports to return them to an upper position when each cam moves away from the platen supports.
- Springs 52 are connected between the platen supports and the pump base 20 .
- Springs 51 spring load the platens so that they may be overdriven. This enables the pump to be used with tubes of differing dimensions, as discussed above.
- pump assembly 50 is mounted in cabinet 70 , as shown in FIGS. 8-16 .
- Cabinet 70 comprises keyhole 73 , case 74 , display 75 , keypad 76 , and door 78 .
- tubing 21 with an occluder 80 is also shown in FIG. 8 .
- Occluder 80 has a first end 81 , a second end 82 , and a slit 83 .
- tubing 21 is routed through slit 83 proximate first end 81 .
- Slit 83 is narrowest where the slit is closest to end 81 .
- Slit 83 is wider proximate second end 82 .
- Fluid flows freely through tubing 21 when the tubing is located proximate second end 82 .
- tubing 21 is shown unoccluded in FIG. 8 . Fluid may flow freely through the tubing to a patient.
- FIG. 9 shows occluder 80 being inserted into slot 73 of the present invention.
- Second end 82 must be inserted to open door 78 , as first end 81 is too thick to fit into keyhole 73 .
- tubing 21 is forced towards first end 81 , as shown in FIG. 10 .
- Door 78 unlocks as shown in FIG. 10 , exposing the pump assembly.
- Door 78 is unlocked when hooks 72 disengage loops 71 .
- Tubing 21 is routed along tubing channel 79 , between the tubing base and the platens, as shown in FIG. 11 .
- Door 78 is closed, as shown in FIG. 12 .
- Occluder 80 is removed from keyhole 73 , and tubing 21 is moved through slot 83 until it is unoccluded. This is shown in FIG. 13 .
- the pump may now operate to deliver fluid to a patient.
- occluder 80 is again inserted in keyhole 73 . This forces tubing 21 to first end 81 , occluding the tubing.
- Door 78 opens, as shown in FIG. 14 .
- the tubing is removed from the pump in FIG. 15 .
- FIG. 16 shows the tubing outside the pump and pump door 78 closed. Tubing 21 is still occluded.
- the present invention requires the tubing to be occluded before the door can be opened. This will prevent medical personnel from forgetting to occlude the tubing before it is removed from the pump.
- FIG. 17 is a perspective view of a device 100 of the present invention.
- FIG. 18 is an exploded view of device 100 shown in FIG. 17 .
- Pump platens 102 and 104 swivel about axis 106 due to the action of cams 108 and 110 , respectively, and springs 112 .
- Cams 108 and 110 are shaped so that as the cams rotate, the cams oscillate across the surfaces 114 and 116 , respectively. For example, the contact point for cam 108 moves back and fourth between lines 118 and 120 on pump platen 102 .
- occlusion platens 130 and 132 swivel about axis 106 due to the action of cams 134 and 136 , respectively, and springs 112 .
- FIG. 18 Although two pump platens are shown in FIG. 18 , it should be understood that the present invention is not limited to any particular number of pump platens.
- a single pump platen or more than two pump platens can be used in device 100 .
- increasing the number of pump platens reduces and smoothes out the peak torque associated with occluding the tubing (shown in FIGS. 22-26 ) with the pump platens, as described below. With a reduction in peak torque, a less rugged gear train 138 is needed and less power may be needed to drive the pump platens.
- the complexity of device 100 is disadvantageously increased.
- FIG. 19 is a front perspective view of occlusion platen 130 shown in FIG. 18 . It should be understood that the description for platen 130 also is applicable to occlusion platen 132 .
- Apex 140 of protrusion 142 is formed to minimize the stress placed upon tubing (not shown) used in embodiment 100 . Specifically, apex 140 is formed with a particular curvature or radius. As a result, the tubing responds to the alternating compressions in a more consistent manner, over a longer period of time, increasing the accuracy of embodiment 100 .
- apex 140 is configured so that the deformed tubing is formed in a shape with a minimal inside energy. As a result, the tubing has the smallest inside stress and plastic deformation. Reducing inside stress and plastic deformation decreases the flow rate error, which is typically measured after 96 hours.
- platen 130 includes insert 143 , which slides into the main body of platen 130 .
- insert 143 allows the main body of 130 and the insert to be made of different materials.
- a plastic may have desirable characteristics with respect to the interaction of the platen with the cams, but may lack the structural strength needed for the protrusion.
- a metal may have the strength characteristics desired for the protrusion but may lack the characteristics desirable for interaction with the cams.
- the main body can be made of the plastic and the insert can be made of the metal.
- FIGS. 20 and 21 are side views of the tube support plate 150 and pump platen 102 . The following should be viewed in light of FIGS. 20 and 21 .
- Tube support plate 150 is not shown in FIG. 17 .
- Pump platen 102 includes a stop platen 152 .
- stop platen 152 is the portion of pump platen 102 that pushes against tubing 154 to occlude the tubing as shown in FIG. 21 .
- stop platen 152 is formed by platen surface 156 and includes ridge/protrusion 158 . Ridge 158 is convex with respect the main body 160 of platen 102 .
- ridge 158 is arcuate, specifically in a plane orthogonal to the direction of fluid flow through apparatus 100 (shown in FIGS. 22-26 below). That is, the ridge is arcuate as shown in the front view of FIGS. 20 and 21 . In some aspects, the ridge is centered with respect to the tubing along the axis 162 . The ridge has a width measured orthogonally with respect to the direction of fluid flow (in and out of the page as shown in FIGS. 20 and 21 ). This orientation is along axis 162 in FIG. 21 . In some aspects, the width is less than a diameter (not shown) of the tubing. It should be understood that when references are made with respect to an alignment regarding tubing 154 , such reference assumes that the tubing is secured within platen 102 .
- Platen 102 includes a concavity 164 .
- stop platen 152 is disposed within concavity 164 . That is, platen 152 forms a part of concavity 164 .
- concavity 164 is parallel to a longitudinal axis 166 (shown in end view) for tubing 154 . In general, axis 166 is parallel to the direction of fluid flow in device 100 . Concavity 164 holds tubing 154 . In some aspects, concavity 164 is shaped so that tubing 154 does not shift in a direction substantially parallel to axis 162 .
- support plate 150 includes ridge/protrusion 168 .
- ridge 168 is the portion of plate 150 which engages tubing 154 and towards which stop platen 152 pushes to occlude the tubing as shown in FIG. 21 .
- plate 150 is continuous with respect to the stop platen engaging the plate.
- Ridge 168 is convex with respect the main body 170 of plate 150 .
- ridge 168 is arcuate, specifically in a plane orthogonal to the direction of fluid flow through apparatus 100 (shown in FIGS. 22-26 below). That is, the ridge is arcuate as shown in the front view of FIGS. 20 and 21 .
- the ridge is centered with respect to the tubing along the axis 162 .
- the ridge has a width measured orthogonally with respect to the direction of fluid flow (in and out of the page as shown in FIGS. 20 and 21 ). This orientation is along axis 162 in FIG. 21 .
- the width is less than a diameter (not shown) of the tubing.
- ridges 158 and 168 are symmetrical with respect to axis 172 , orthogonal to axis 162 .
- Concavity 164 includes surfaces 174 and 176 .
- Stop platen 152 is located between surfaces 174 and 176 .
- surfaces 156 , 174 , and 176 form a continuous surface within concavity 164 .
- surfaces 174 and 176 are symmetrical with respect to longitudinal axis 166 and axis 172 .
- stop platen 152 is symmetrical with respect to axis 172 .
- at least a portion of surfaces 174 and 176 are arranged to engage tubing 154 when the tubing is pressed between platen 102 and plate 150 .
- Stop platen 152 and ridge 168 are configured so that when the tubing is engaged by platen 152 and ridge 168 , for example, as shown in FIG. 21 , the deformed tubing is formed in a shape with a minimal inside energy. As a result, the tubing has the smallest inside stress and plastic deformation. Reducing inside stress and plastic deformation decreases the flow rate error, which is typically measured after 96 hours.
- Tubing 154 includes an inner surface 178 .
- Device 100 is arranged to compress tubing 154 between stop platen 152 and ridge 168 by moving pump platen 102 from the position shown in FIG. 20 to the position shown in FIG. 21 .
- stop platen 152 is in a closest position to ridge 168 .
- sections of surface 178 are brought into contact.
- tubing 154 is formed into lobes 180 and 182 .
- Lobes 180 and 182 form passages through which liquid can pass.
- the sections of surface 178 are diametrically opposed with respect to longitudinal axis 166 .
- ridges 158 and 168 are arcuate and symmetrical with respect to axis 162 .
- surfaces 174 and 176 can be formed so that tubing 154 engages these surfaces and lobes 180 and 182 are substantially symmetrical with respect to axis 162 and 166 .
- a top half 184 of the circumference of tubing 154 is engaged with concavity 164 as shown in FIG. 21 .
- FIGS. 22-28 are side views of device 100 showing a sequence of operation.
- FIGS. 22 through 28 show the operation of occlusion valves 130 and 132 and pump platens 102 and 104 .
- Direction of fluid flow 190 also is shown in FIGS. 22-28 .
- FIGS. 22-28 also illustrate the use of two pump platens in a sequenced fashion. It should be understood that device 100 can operate in a “reverse” fashion (not shown), such that the direction of flow is from right to left in FIGS. 22 through 28 .
Abstract
Description
- This is a continuation-in-part patent application under 35 USC 120, which claims the benefit of U.S. patent application Ser. No. 10/117,515, filed Apr. 5, 2002, entitled, “ENERGY-SAVING ANTI-FREE FLOW PORTABLE PUMP FOR USE WITH STANDARD PVC IV TUBING” and incorporated by reference herein.
- This invention relates to a pump for providing fluid for injection into a patient. More specifically it relates to a method and apparatus for an ambulatory infusion pump for pumping liquid through standard intravenous (IV) tubing.
- Infusion pumps for delivering fluid to a patient are well known in the art. Two general categories of infusion pumps known in the art are ambulatory pumps and large volume parenteral (LVP) pumps. These pumps deliver fluid to a patient through tubing at higher accuracies than gravity drip tubing delivery systems.
- LVP pumps are relatively large infusion pumps that can provide a fluid to a patient for 4-6 hours or more on a single battery charge, or indefinitely from an AC power connection. They may operate on standard IV polyvinyl chloride (PVC) tubing. Most available LVP pumps completely collapse the PVC tubing during operation to ensure that there is no free flow to the patient or back flow to the fluid reservoir. This leads to very high power consumption when using standard tubing. Thus, a battery capable of powering the pump for 24 hours is very heavy and bulky. A patient receiving fluid from an LVP pump must stay within reach of a power cord, or push a wheeled stand with the LVP pump and battery mounted on it. In addition, fully collapsing the tubing deforms the tubing. The tubing cross section becomes more elliptical the longer the pump operates on it. Less fluid is discharged from the tubing as the cross section becomes more elliptical, leading to negative flow rate errors. The pump rate accuracy decays proportional to the amount of time an individual tubing set is used to deliver fluid to a patient. An example of an LVP infusion pump is shown in U.S. Pat. No. 4,653,987 (Tsuji et al.).
- Ambulatory pumps are smaller infusion pumps that can be attached to a patient's belt, allowing them to move around without a bulky LVP pump. However, there are several drawbacks in comparison to the LVP pump. To reduce the weight to a level where a patient can carry the pump, the size of the battery is reduced considerably. The reduced battery cannot provide the power required to completely collapse standard PVC tubing. Instead, many ambulatory pumps require the use of special dedicated IV sets, or special silicon tubing threaded through a cassette to be inserted into the pump. This specialized equipment increases the cost of using the pumps. Even with special dedicated IV sets or silicon tubing and cassettes, many ambulatory pumps can only provide fluid to a patient for a few hours on a single battery charge. An example of an infusion pump that requires a dedicated IV set is shown in U.S. Pat. No. 5,772,409 (Johnson). An example of an ambulatory infusion pump that requires silicon tubing and cassettes is shown in U.S. Pat. No. 5,791,880 (Wilson).
- Another problem with the infusion pumps currently in the art is the danger of free flow of fluid when the tubing is inserted or removed from the pump. An occluder is used to completely collapse the tubing while the tubing is outside the pump. The occluder is disengaged when the tubing is installed in the pump. The tubing is occluded again before the tubing is taken out of the pump. However, there is no means currently in the art to ensure that the tubing is occluded before the tubing is installed into or removed from the pump. Thus, the tubing may accidentally become unoccluded while the tubing is outside the pump, allowing fluid to flow freely to the patient. This overdose of fluid may be harmful or even lethal.
- Clearly, then, there is a longfelt need for an ambulatory infusion pump that utilizes standard PVC tubing, operates for approximately 24 hours on one battery charge, and can prevent free flow of fluid into the patient.
- The present invention comprises an apparatus for pumping fluid through tubing. The apparatus includes a tubing base having a tubing support surface and a stop platen. The stop platen and the tubing support surface each comprise respective ridges aligned with a direction of fluid flow through the apparatus. The respective ridges are operatively arranged to engage a wall of tubing along a longitudinal axis of the tubing. In some aspects, the respective ridges are arcuate in a plane orthogonal to the direction of flow. In some aspects, the respective ridges are centered with respect to a transverse axis of the tubing and have a respective width less than an outside diameter of the tubing.
- The stop platen is arranged to be moved to a position closest to the tubing base and when the stop platen is in this position, the tubing is formed in first and second lobes. The lobes form passages through said first tubing. In some aspects, the lobes are symmetrical with respect to the longitudinal axis.
- The present invention also includes a method for pumping fluid through tubing.
- A general object of the present invention is to provide an ambulatory pump that utilizes standard PVC tubing.
- Another object of the present invention is to provide an ambulatory pump with high accuracy, preferably better than ±5% accuracy.
- It is a further object to provide an ambulatory pump that can deliver fluid to a patient at a relatively high volume flow rate, for example 125 ml/hour, for at least 24 hours.
- It is yet another object to provide an ambulatory pump that prevents the free flow of fluid into the patient when the tubing is installed and removed.
- These and other objects, features and advantages of the present invention will become readily apparent to those having ordinary skill in the art upon a reading of the following detailed description of the invention in view of the drawings and claims.
- The nature and mode of operation of the present invention will now be more fully described in the following detailed description of the invention taken with the accompanying drawing figures, in which:
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FIG. 1 is a side view of a first embodiment of the present invention, with the platens arranged to allow fluid flow from a reservoir; -
FIG. 1 a is a perspective view of an occlusion platen; -
FIG. 1 b is a perspective view of a pump platen with a stop platen thereon; -
FIG. 2 is a side view of a first embodiment of the present invention, with the platens arranged to allow fluid flow to a patient; -
FIG. 3 is a side view of a first embodiment of the present invention, with the platens arranged to pump fluid to a patient; -
FIG. 4 is a side view of a first embodiment of the present invention, with the platens arranged at the end of a pump cycle; -
FIG. 4 a is a cross sectional view of the tubing and the pump platen showing the dimensions of the stop platen and the tubing; -
FIG. 4 b is a cross sectional view of the tubing and the pump platen, with the stop platen completely collapsing a portion of the width of the tubing; -
FIG. 5 is a perspective view of an embodiment of the present invention; -
FIG. 6 is an exploded view of an embodiment of the present invention; -
FIG. 7 is an electrical schematic of the motor drive circuit of an embodiment of the present invention; -
FIG. 8 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing unoccluded; -
FIG. 9 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the occluder being inserted in the keyhole of the present invention; -
FIG. 10 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open; -
FIG. 11 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open, and the tubing installed in the pump; -
FIG. 12 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing installed in the pump; -
FIG. 13 is a front perspective view of an embodiment of the present arranged to pump fluid through the tubing; -
FIG. 14 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention opened, and the tubing installed in the pump; -
FIG. 15 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention open, and the tubing uninstalled from the pump; -
FIG. 16 is a front perspective view of an embodiment of the present invention, a section of tubing, and an occluder, with the door of the present invention closed, and the tubing occluded; -
FIG. 17 is a perspective view of a device of the present invention; -
FIG. 18 is an exploded view of the device shown inFIG. 17 ; -
FIG. 19 is a front perspective view of an occlusion platen shown inFIG. 18 ; -
FIGS. 20 and 21 are side views of a tube support plate and a pump platen; and, -
FIGS. 22-28 are side views of the device showing a sequence of operation. - It should be appreciated that, in the detailed description of the invention which follows, like reference numbers on different drawing views are intended to identify identical structural elements of the invention in the respective views.
- A first embodiment of the present invention is shown in
FIG. 1 and generally designated 10.Apparatus 10 is an infusion pump comprisingpump base 20 withtubing base 31 fixed thereto.Tubing 21 is routed overtubing base 31 underneathocclusion platens platen 25.Occlusion platen 22 is fixed toplaten support 55.Occlusion platen 29 is fixed toplaten support 55.Pump platen 25 comprisesstop platen 26, and is fixed toplaten support 55.Motor 42 is fixed to pumpbase 20.Motor 42drives camshaft 38.Camshaft 38 is supported by shaft supports 40 and 41.Cams camshaft 38. Ascamshaft 38 rotates when driven bymotor 42,cams Cam 35 is operatively arranged to cyclicallydrive occlusion platen 29 between a first, unoccluding position and a second, occluding position. The first position is shown inFIG. 1 , whereinocclusion platen 29 is not in contact withtubing 21. Ascam 35 is rotated byshaft 38,platen support 55 is driven down bycam 35. This drivesocclusion platen 29 towardstubing 21.Occlusion platen 29 is driven to a second position, shown inFIGS. 2, 3 , and 4, whereocclusion platen 29 occludestubing 21. As the shaft continues to rotate,cam 35 moves away fromplaten support 55.Spring 52, shown onFIGS. 5 and 6 , provides upward force onplaten support 55 to liftocclusion platen 29 back to the first, unoccluded position.Cam 39 drivesocclusion platen 22 through a similar cycle.Occlusion platen 22 is driven from a first, unoccluded position to a second, occluded position. However,occlusion platen 22 occludestubing 21 at substantially different times thanocclusion platen 29.Occlusion platen 22 is shown occludingtubing 21 inFIGS. 1 and 4 .Spring 52, shown onFIGS. 5 and 6 , provides upward force onplaten support 55 to liftocclusion platen 22 back to the first, unoccluded position whencam 39 moves away fromplaten support 55 due to the rotation ofshaft 38. -
Cam 36 drives pumpplaten 25 from a first position to a second position asshaft 38 rotates. The first position is shown inFIGS. 1, 2 , and 4 a. The pump platen is not in contact withtubing 21. As shown inFIG. 4 a, width d ofstop platen 26 is less than width w oftubing 21. Asshaft 38 rotates,cam 36 drives platensupport 55 to a second position, shown inFIGS. 3, 4 , and 4 b. In the second position, pumpplaten 25 depressestubing 21. Stopplaten 26 completely collapses a section of the width oftubing 21, as shown inFIG. 4 b. Stopplaten 26 preventspump platen 25 from occludingtubing 21. Stopplaten 26 does not occludetubing 21 becausestop platen 26 is narrower thantubing 21, as shown inFIG. 4 a. Occlusion by the pump platen is undesirable because it would require significantly more power than partially occluding the tubing, as shown inFIGS. 3, 4 , and 4 b. Further, the tubing does not deform as readily when partially deflected by the pump platen, as compared to the deformation caused by occluding the tubing. - In one embodiment, the platens are spring loaded, to allow the platens to be overdriven. This ensures
tubing 21 is occluded by the occlusion platens or partially occluded by the stop platen, regardless of the dimension oftubing 21. This improves the accuracy of the pump when using tubing of varying dimensions. Otherwise expensive, complicated measurement devices are needed to ensure that the tubing is deflected the appropriate amount by each platen.Springs 52, shown inFIGS. 5 and 6 , accomplish this spring loading. - As shown in
FIGS. 1-4 , 1 b, 4 a, and 4 b, an embodiment ofstop platen 26 is a platen that extends the length of the pump platen, and is centered along the width of the pump platen. However, it should be readily apparent to one skilled in the art that many other configurations of stop platens could be used and these modifications are intended to be within the spirit and scope of the invention as claimed. For example, the stop platen could extend only a portion of the length of the pump platen, or it could be located away from the center of the pump platen. A stop platen shorter than the pump platen could be off center along either the length or width of the pump platen, or both. -
FIG. 1 shows platen 22 occludingtubing 21, andplatens tubing 21. This is the first position in the pump cycle, which allows fluid from a reservoir (not shown) in flow communication withend 14 oftubing 21 to flow into the tubing proximate the pump platen.FIG. 2 shows platen 29 occludingtubing 21, andplatens tubing 21. This position allows fluid to flow to a patient (not shown) in flow communication withend 12 oftubing 21.FIG. 3 shows platen 29 occludingtubing 21,platen 25 depressingtubing 21 untilstop platen 26 completely collapses the central portion of the width oftubing 21, andplaten 22 abovetubing 21. This configuration forces the fluid intubing 21 towardsend 12 of the tubing.FIG. 4 showsplatens tubing 21, andplaten 25 depressingtubing 21 untilstop platen 26 completely collapses the central portion of the width oftubing 21. This is the end of the cycle. Platens 25 and 29 move up again to return to the first configuration of the pump cycle shown inFIG. 1 . -
FIGS. 1-6 show asingle pump platen 25. However, it should be readily apparent to one skilled in the art that a plurality of pump platens may be used, and these configurations are intended to be within the spirit and scope of the invention as claimed. -
FIG. 1 a is a perspective view ofocclusion platen 29.FIG. 1 b is a perspective view ofpump platen 25 withstop platen 26 thereon. -
FIG. 5 is a perspective view of an embodiment of the present invention, designated 50.FIGS. 1-4 show motor 42 mounted in line withcamshaft 38 so that the platens are visible. To reduce the volume of the pumping assembly, an embodiment locates the motor parallel to the camshaft, coupling them withgears 45 as shown inFIGS. 5 and 6 . It should be readily apparent to one skilled in the art that many mechanical configurations are possible, and these modifications are within the spirit and scope of the invention as claimed. -
FIG. 6 is an exploded view of an embodiment of the present invention in perspective.Springs 52 provide an upward force on the platen supports to return them to an upper position when each cam moves away from the platen supports.Springs 52 are connected between the platen supports and thepump base 20.Springs 51 spring load the platens so that they may be overdriven. This enables the pump to be used with tubes of differing dimensions, as discussed above. - In an embodiment,
pump assembly 50 is mounted incabinet 70, as shown inFIGS. 8-16 .Cabinet 70 compriseskeyhole 73,case 74,display 75,keypad 76, anddoor 78. Also shown inFIG. 8 istubing 21 with anoccluder 80.Occluder 80 has afirst end 81, asecond end 82, and aslit 83. To occludetubing 21,tubing 21 is routed throughslit 83 proximatefirst end 81.Slit 83 is narrowest where the slit is closest to end 81.Slit 83 is wider proximatesecond end 82. Fluid flows freely throughtubing 21 when the tubing is located proximatesecond end 82. Thus,tubing 21 is shown unoccluded inFIG. 8 . Fluid may flow freely through the tubing to a patient. - Free flow of fluid through the tubing is prevented with the present apparatus as follows.
FIG. 9 shows occluder 80 being inserted intoslot 73 of the present invention.Second end 82 must be inserted toopen door 78, asfirst end 81 is too thick to fit intokeyhole 73. Asoccluder 80 is inserted intokeyhole 73,tubing 21 is forced towardsfirst end 81, as shown inFIG. 10 . Thus to opendoor 79,tubing 21 must be occluded byoccluder 80.Door 78 unlocks as shown inFIG. 10 , exposing the pump assembly.Door 78 is unlocked when hooks 72disengage loops 71.Tubing 21 is routed alongtubing channel 79, between the tubing base and the platens, as shown inFIG. 11 .Door 78 is closed, as shown inFIG. 12 .Occluder 80 is removed fromkeyhole 73, andtubing 21 is moved throughslot 83 until it is unoccluded. This is shown inFIG. 13 . The pump may now operate to deliver fluid to a patient. - To remove the tubing from
cabinet 70,occluder 80 is again inserted inkeyhole 73. This forcestubing 21 tofirst end 81, occluding the tubing.Door 78 opens, as shown inFIG. 14 . The tubing is removed from the pump inFIG. 15 .FIG. 16 shows the tubing outside the pump and pumpdoor 78 closed.Tubing 21 is still occluded. In the above-described manner, the present invention requires the tubing to be occluded before the door can be opened. This will prevent medical personnel from forgetting to occlude the tubing before it is removed from the pump. -
FIG. 17 is a perspective view of adevice 100 of the present invention. -
FIG. 18 is an exploded view ofdevice 100 shown inFIG. 17 .Pump platens axis 106 due to the action ofcams Cams surfaces cam 108 moves back and fourth betweenlines pump platen 102. In like manner,occlusion platens axis 106 due to the action ofcams - Although two pump platens are shown in
FIG. 18 , it should be understood that the present invention is not limited to any particular number of pump platens. For example, a single pump platen or more than two pump platens can be used indevice 100. In general, increasing the number of pump platens reduces and smoothes out the peak torque associated with occluding the tubing (shown inFIGS. 22-26 ) with the pump platens, as described below. With a reduction in peak torque, a lessrugged gear train 138 is needed and less power may be needed to drive the pump platens. However, if too many pump platens are used, the complexity ofdevice 100 is disadvantageously increased. -
FIG. 19 is a front perspective view ofocclusion platen 130 shown inFIG. 18 . It should be understood that the description forplaten 130 also is applicable toocclusion platen 132.Apex 140 ofprotrusion 142 is formed to minimize the stress placed upon tubing (not shown) used inembodiment 100. Specifically, apex 140 is formed with a particular curvature or radius. As a result, the tubing responds to the alternating compressions in a more consistent manner, over a longer period of time, increasing the accuracy ofembodiment 100. In general,apex 140 is configured so that the deformed tubing is formed in a shape with a minimal inside energy. As a result, the tubing has the smallest inside stress and plastic deformation. Reducing inside stress and plastic deformation decreases the flow rate error, which is typically measured after 96 hours. - In some aspects,
platen 130 includesinsert 143, which slides into the main body ofplaten 130. The use ofinsert 143 allows the main body of 130 and the insert to be made of different materials. For example, a plastic may have desirable characteristics with respect to the interaction of the platen with the cams, but may lack the structural strength needed for the protrusion. Likewise, a metal may have the strength characteristics desired for the protrusion but may lack the characteristics desirable for interaction with the cams. Thus, the main body can be made of the plastic and the insert can be made of the metal. -
FIGS. 20 and 21 are side views of thetube support plate 150 andpump platen 102. The following should be viewed in light ofFIGS. 20 and 21 .Tube support plate 150 is not shown inFIG. 17 . It should be understood that the description ofpump platen 102 also is applicable to pumpplaten 104.Pump platen 102 includes astop platen 152. In general, stop platen 152 is the portion ofpump platen 102 that pushes againsttubing 154 to occlude the tubing as shown inFIG. 21 . In general, stop platen 152 is formed byplaten surface 156 and includes ridge/protrusion 158.Ridge 158 is convex with respect themain body 160 ofplaten 102. In some aspects,ridge 158 is arcuate, specifically in a plane orthogonal to the direction of fluid flow through apparatus 100 (shown inFIGS. 22-26 below). That is, the ridge is arcuate as shown in the front view ofFIGS. 20 and 21 . In some aspects, the ridge is centered with respect to the tubing along theaxis 162. The ridge has a width measured orthogonally with respect to the direction of fluid flow (in and out of the page as shown inFIGS. 20 and 21 ). This orientation is alongaxis 162 inFIG. 21 . In some aspects, the width is less than a diameter (not shown) of the tubing. It should be understood that when references are made with respect to analignment regarding tubing 154, such reference assumes that the tubing is secured withinplaten 102. -
Platen 102 includes aconcavity 164. In some aspects, stop platen 152 is disposed withinconcavity 164. That is,platen 152 forms a part ofconcavity 164. In some aspects,concavity 164 is parallel to a longitudinal axis 166 (shown in end view) fortubing 154. In general,axis 166 is parallel to the direction of fluid flow indevice 100.Concavity 164 holdstubing 154. In some aspects,concavity 164 is shaped so thattubing 154 does not shift in a direction substantially parallel toaxis 162. - In some aspects,
support plate 150 includes ridge/protrusion 168. In general,ridge 168 is the portion ofplate 150 which engagestubing 154 and towards which stopplaten 152 pushes to occlude the tubing as shown inFIG. 21 . In some aspects,plate 150 is continuous with respect to the stop platen engaging the plate.Ridge 168 is convex with respect themain body 170 ofplate 150. In some aspects,ridge 168 is arcuate, specifically in a plane orthogonal to the direction of fluid flow through apparatus 100 (shown inFIGS. 22-26 below). That is, the ridge is arcuate as shown in the front view ofFIGS. 20 and 21 . In some aspects, the ridge is centered with respect to the tubing along theaxis 162. The ridge has a width measured orthogonally with respect to the direction of fluid flow (in and out of the page as shown inFIGS. 20 and 21 ). This orientation is alongaxis 162 inFIG. 21 . In some aspects, the width is less than a diameter (not shown) of the tubing. In some aspects,ridges axis 172, orthogonal toaxis 162. -
Concavity 164 includessurfaces surfaces concavity 164. In some aspects, surfaces 174 and 176 are symmetrical with respect tolongitudinal axis 166 andaxis 172. In some aspects, stop platen 152 is symmetrical with respect toaxis 172. In some aspects at least a portion ofsurfaces tubing 154 when the tubing is pressed betweenplaten 102 andplate 150. Stopplaten 152 andridge 168 are configured so that when the tubing is engaged byplaten 152 andridge 168, for example, as shown inFIG. 21 , the deformed tubing is formed in a shape with a minimal inside energy. As a result, the tubing has the smallest inside stress and plastic deformation. Reducing inside stress and plastic deformation decreases the flow rate error, which is typically measured after 96 hours. -
Tubing 154 includes aninner surface 178.Device 100 is arranged to compresstubing 154 betweenstop platen 152 andridge 168 by movingpump platen 102 from the position shown inFIG. 20 to the position shown inFIG. 21 . InFIG. 21 , stop platen 152 is in a closest position toridge 168. InFIG. 21 , sections ofsurface 178 are brought into contact. As a result,tubing 154 is formed intolobes Lobes FIG. 21 , the sections ofsurface 178 are diametrically opposed with respect tolongitudinal axis 166. In some aspects,ridges axis 162. Also surfaces 174 and 176 can be formed so thattubing 154 engages these surfaces andlobes axis top half 184 of the circumference oftubing 154 is engaged withconcavity 164 as shown inFIG. 21 . -
FIGS. 22-28 are side views ofdevice 100 showing a sequence of operation.FIGS. 22 through 28 show the operation ofocclusion valves platens fluid flow 190 also is shown inFIGS. 22-28 . AfterFIG. 28 , the sequence begins again withFIG. 22 .FIGS. 22-28 also illustrate the use of two pump platens in a sequenced fashion. It should be understood thatdevice 100 can operate in a “reverse” fashion (not shown), such that the direction of flow is from right to left inFIGS. 22 through 28 . - Thus, it is seen that the objects of the present invention are efficiently obtained, although modifications and changes to the invention should be readily apparent to those having ordinary skill in the art, and these modifications are intended to be within the spirit and scope of the invention as claimed.
Claims (20)
Priority Applications (1)
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US11/131,058 US20050214146A1 (en) | 2002-04-05 | 2005-05-17 | Energy-saving anti-free flow portable pump for use with standard PVC IV tubing |
Applications Claiming Priority (2)
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US10/117,515 US7059840B2 (en) | 2002-04-05 | 2002-04-05 | Energy-saving, anti-free flow portable pump for use with standard PVC IV tubing |
US11/131,058 US20050214146A1 (en) | 2002-04-05 | 2005-05-17 | Energy-saving anti-free flow portable pump for use with standard PVC IV tubing |
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US10/117,515 Continuation-In-Part US7059840B2 (en) | 2002-04-05 | 2002-04-05 | Energy-saving, anti-free flow portable pump for use with standard PVC IV tubing |
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US20050214146A1 true US20050214146A1 (en) | 2005-09-29 |
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US10/117,515 Expired - Lifetime US7059840B2 (en) | 2002-04-05 | 2002-04-05 | Energy-saving, anti-free flow portable pump for use with standard PVC IV tubing |
US11/131,058 Abandoned US20050214146A1 (en) | 2002-04-05 | 2005-05-17 | Energy-saving anti-free flow portable pump for use with standard PVC IV tubing |
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US10/117,515 Expired - Lifetime US7059840B2 (en) | 2002-04-05 | 2002-04-05 | Energy-saving, anti-free flow portable pump for use with standard PVC IV tubing |
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US7467932B2 (en) * | 2004-06-30 | 2008-12-23 | Millipore Corporation | Peristaltic pump comprising members for locating a tube |
US20060002805A1 (en) * | 2004-06-30 | 2006-01-05 | Millipore Corporation | Peristaltic pump comprising members for locating a tube |
US9404490B2 (en) | 2004-11-24 | 2016-08-02 | Q-Core Medical Ltd. | Finger-type peristaltic pump |
US8678793B2 (en) | 2004-11-24 | 2014-03-25 | Q-Core Medical Ltd. | Finger-type peristaltic pump |
US10184615B2 (en) | 2004-11-24 | 2019-01-22 | Q-Core Medical Ltd. | Peristaltic infusion pump with locking mechanism |
US9657902B2 (en) | 2004-11-24 | 2017-05-23 | Q-Core Medical Ltd. | Peristaltic infusion pump with locking mechanism |
US9581152B2 (en) | 2006-11-13 | 2017-02-28 | Q-Core Medical Ltd. | Magnetically balanced finger-type peristaltic pump |
US9333290B2 (en) | 2006-11-13 | 2016-05-10 | Q-Core Medical Ltd. | Anti-free flow mechanism |
US9056160B2 (en) | 2006-11-13 | 2015-06-16 | Q-Core Medical Ltd | Magnetically balanced finger-type peristaltic pump |
US10113543B2 (en) | 2006-11-13 | 2018-10-30 | Q-Core Medical Ltd. | Finger type peristaltic pump comprising a ribbed anvil |
US8920144B2 (en) | 2009-12-22 | 2014-12-30 | Q-Core Medical Ltd. | Peristaltic pump with linear flow control |
US9457158B2 (en) | 2010-04-12 | 2016-10-04 | Q-Core Medical Ltd. | Air trap for intravenous pump |
US9674811B2 (en) | 2011-01-16 | 2017-06-06 | Q-Core Medical Ltd. | Methods, apparatus and systems for medical device communication, control and localization |
US9726167B2 (en) | 2011-06-27 | 2017-08-08 | Q-Core Medical Ltd. | Methods, circuits, devices, apparatuses, encasements and systems for identifying if a medical infusion system is decalibrated |
US9855110B2 (en) | 2013-02-05 | 2018-01-02 | Q-Core Medical Ltd. | Methods, apparatus and systems for operating a medical device including an accelerometer |
US11426515B2 (en) | 2019-07-25 | 2022-08-30 | Zevex, Inc. | Infusion pump cassette having integrated pinch clip occluder |
WO2021096578A1 (en) * | 2019-11-14 | 2021-05-20 | Zevex, Inc. | Infusion pump apparatus having convex platen surface |
US11446431B2 (en) | 2019-11-14 | 2022-09-20 | Zevex, Inc. | Infusion pump apparatus having convex platen surface |
US11679189B2 (en) | 2019-11-18 | 2023-06-20 | Eitan Medical Ltd. | Fast test for medical pump |
Also Published As
Publication number | Publication date |
---|---|
US20030190246A1 (en) | 2003-10-09 |
EP1350955A2 (en) | 2003-10-08 |
EP1350955A3 (en) | 2004-04-14 |
US7059840B2 (en) | 2006-06-13 |
EP1350955B1 (en) | 2011-10-05 |
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