WO1997010856A9 - Dispositifs de regulation des fluides extraits par succion - Google Patents

Dispositifs de regulation des fluides extraits par succion

Info

Publication number
WO1997010856A9
WO1997010856A9 PCT/US1996/014770 US9614770W WO9710856A9 WO 1997010856 A9 WO1997010856 A9 WO 1997010856A9 US 9614770 W US9614770 W US 9614770W WO 9710856 A9 WO9710856 A9 WO 9710856A9
Authority
WO
WIPO (PCT)
Prior art keywords
load cell
disposable liner
weight
microcontroller
fluid
Prior art date
Application number
PCT/US1996/014770
Other languages
English (en)
Other versions
WO1997010856A1 (fr
Filing date
Publication date
Application filed filed Critical
Priority to AU72386/96A priority Critical patent/AU7238696A/en
Publication of WO1997010856A1 publication Critical patent/WO1997010856A1/fr
Publication of WO1997010856A9 publication Critical patent/WO1997010856A9/fr

Links

Definitions

  • the present invention relates to devices for monitoring the weight and/or volume of fluids removed from patients, such as surgical patients, via suction.
  • Blood, saline irrigant. and other fluids encountered in the body cavities and wounds of patients are conventionally removed directly from the surgical site via suction. Such fluids are scavenged using suction tips and tubing which are connected to canisters or disposable containers which are, in turn, connected to a vacuum source. Conventionally, a central vacuum source is accessed via a port on the wall of the surgical suite by connecting tubing to the canister or disposable container. Accordingly, blood not absorbed by surgical (cotton or synthetic) sponges used in surgery or absorbed by the surgical drapes can be removed with the aid of such tubing and vacuum-driven canisters or disposable containers.
  • the conventional canister is clear and is graduated to indicate the volume of fluid in an inner liner.
  • the inner liner is disposable and has two or more ports. Each port may be independently capped or alternately connected to tubing.
  • the tubing from the primary port is connected to the vacuum source, while the tubing from the second port is connected to an appropriate suction tip of conventional structure.
  • the rigid, graduated outer receptacle and the less rigid inner liner in such systems are both at least partially transmissive to light, so that the fluid in the liner may be seen.
  • the graduations on the receptacle allow the volume of fluid in the liner to be estimated.
  • the calibrations mark 100 ml (or cubic centimeter) increments so that estimations may be made of fluid and blood product losses and consequent infusion needs of the patient.
  • These canisters comprising the receptacles and liners may be located on a conventional floor stand or engaged by a wall-mounted frame. In either case, the canisters are typically an appreciable distance from the surgical field, usually ten to twelve feet away.
  • the calibrations on the receptacles are small, and, coupled with the usual distance, difficult to read.
  • the inventor has found that end users overestimate the volume of fluids that have been removed from the patient because of these discrepancies.
  • the conventional, if inadvertent and unwitting, response is to overinfuse the patient with blood products, saline, and/or other crystalloids.
  • Such overinfusion is not cost-effective, and (in the case of blood) may harbor pathogens or antigens.
  • Blood products are increasingly considered to contain biocontaminants such as superviruses that may cause various communicable diseases. Not only is the potential of infectious diseases in blood products an intrinsic risk attendant with overinfusion. but blood products provoke increased costs of handling, management, inventory and control. Blood processing has accordingly increased healthcare costs of intraoperative and postoperative patient care. Every unit of blood or blood product carries additional administrative and nursing burdens.
  • the present invention provides devices, monitors, disposables and processes that allow more accurate estimation and monitoring of fluids removed from patients by suction.
  • canisters consisting of a receptacle and a liner are suspended from a load cell that is adapted to sense the weight of the fluid in the canister.
  • Any desired container may be employed to contain bodily fluids for monitoring and tracking according to the present invention. including clear, rigid containers, flexible containers, bags, any other vessel of desired structure and material, or combinations thereof.
  • a controller circuit such as a microcontroller receives signals from the load cell and computes therefrom the weight and volume of fluid present.
  • the microcontroller applies signals corresponding to such weight and/or volume to a display and. if desired, to memory capacity or to external equipment via a serial, parallel or other port or interface.
  • the indicia shown on the display are sufficiently large to be read from a distance.
  • the load cells in the devices according to the present invention are preferably structured to be of a monolithic block or segment of metallic or other deformable material, rather than conventional hinge-type load cells.
  • One advantage of the monolithic load cell is that it contains fewer moving parts and is thus less susceptible to spilled fluids and other wear and tear, as canisters or liners are continually changed out and discarded.
  • the load cells according to the present invention serve as accurate and efficient sources of signals corresponding to the weight that they support. Those signals are applied to controller circuitry which receives, stores, and processes them to compute the values that correspond to the weight and volume of fluid contained in the canister. Those values may be applied to a display and. if desired, to memory capacity and/or output ports for coupling to external devices.
  • the controller circuitry of the present invention is adapted to tare the difference between the constant load placed on the load cell by the canister and the weight of fluid within. Additionally, the controller circuitry is adapted to sense when a disposable container has been removed from the device and then to store values corresponding to volume of fluid in the disposable container and containers previously mounted on the device. The device may thus continue the monitoring of the (weight and) volume of bodily fluid suctioned from the patient when and if a new disposable is placed on the monitor device.
  • FIG. 1 is a perspective view of a preferred embodiment of a device according to the present invention.
  • FIG. 2 is a view of the load cell and surrounding portions ofthe device of FIG. 1.
  • FIG. 3 is a functional block diagram of certain circuit components of the device of FIG. 1.
  • FIG. 4 is a flow diagram showing processes carried out by the device of FIG. 1.
  • FIG. 1 shows a preferred embodiment of a fluid monitoring device according to the present invention.
  • Device 10 generally comprises a stand 12 which is adapted to support one or more canisters (receptacles with liners) 14 which are in turn adapted to contain fluids suctioned from patients.
  • Stand 12 may be of conventional design and construction, such as those provided by The Baxter Hospital Supply Division of Baxter Healthcare.
  • stand 12 may be a conventional wall mounted frame for supporting canisters 14 so that they are supported by a wall bracket rather than the sort of stand shown in FIG. 1.
  • Canisters 14 are also of conventional design in the preferred embodiment. In that embodiment, they comprise a disposable liner 16 mounted within a clear receptacle 18.
  • receptacles 18 feature graduated lines 20 which may be employed to estimate the volume of fluid contained in disposable liners 16.
  • receptacles 18, and other portions of the canisters 14 may be conventional products such as those supplied under the Medi-vac® line offered by Baxter Healthcare.
  • 16, for instance, may be a semi-rigid, single-use thin walled container that fits into the reusable, hard-plastic, clear outer receptacle 18.
  • the liner 16 preferably includes a lid 22 with at least one vacuum port 24 which may be employed to connect the liner 16 to a wall vacuum source (not shown) of conventional nature, common to operating suites.
  • the vacuum port 24 may include filtering as desired in order to trap aerosolized microorganisms and/or particulate matter such as bone chips.
  • Disposable liner 16 may also contain a shut off valve which prevents overflow.
  • Disposable liner 16 additionally includes an intake port 26 which may be connected to surgical tubing that is used for suctioning fluid from the patient.
  • the vacuum source such as accessible on the wall, induces a vacuum into disposable liner 16 via the tubing that connects to vacuum port 24.
  • Canisters 14 are typically connected in removable fashion to a conventional stand 12 via dovetail fittings 28. a portion of which are connected to the stand 12 and a portion of which are connected to the canisters 14. In the present invention. however, and preferably for each canister 14.
  • a load cell 30 is attached to each of these portions of the dovetail fitting 28 so as to be inte ⁇ osed between a particular canister 14 and the stand 12.
  • the load cell 30 is electrically connected to a display 32 and a controller 34 (which may, but need not, as shown in FIG. 1. be a portion of the same physical unit).
  • Load cell 30 supports all of the weight of its canister 14 and its contents, together with any positive or negative loads imposed upon the canister 14 via the tubing 15 connected to canister 14.
  • the load cell 30 is adapted to output or modify an electrical signal as a function of the load placed upon load cell 30 by the weight of the canister 14. its contents, and forces imposed by the tubing 15.
  • Controller 34 receives such signals, stores them and outputs them to external devices as desired, and provides them to create a display on display 32 that corresponds to the volume and/or weight of fluid in the canister 14. as described below.
  • Load cell 30 is preferably formed of a monolithic segment or block of metallic or other suitable deformable material 36.
  • segment 36 has three holes bored in it transverse to the direction in which canister 14 will impose a load on segment 36. The bores are performed in order to create three areas 38 of carefully controlled cross section in a plane substantially parallel to the vector of such load (substantially, a vertical plane).
  • Segment 36 includes appurtenances 40 for mounting to the dovetail fittings 28 contained on canisters 14 and stand 12.
  • a conductive element such as a conventional resistive element or strain gauge 42. may be mounted at or near any of the areas 38 of carefully controlled cross section and connected to controller 34.
  • Such element 42. being of conventional design, and mounted to such area 38. is adapted to modify an electrical signal applied to the element when its area 38 is under a tensile or compressive load.
  • the impedance of element 42 changes, but capacitance or any other electrical property as desired may be the factor that changes as the stress on the area underlying the element 42 changes
  • the output of element 42 may be applied to a conventional bridge circuit in the controller 34 so that the modified electrical signals from element 42 may be read by controller 34 and converted in conventional fashion to values that correspond to the weight and volume ofthe fluid and other components imposing a load on the load cell 30.
  • FIG. 2 shows a functional block diagram of the circuits that create a display featured on display 32 using the modified signals 44 from the elements 42.
  • a driver 46 of conventional design applies a drive signal 46 as desired to load cell 30 (element 42).
  • Driver 48 generates drive signal 46 using reference signal 50 which may be, among other things, a standard voltage, direct current signal.
  • Modified signals 44 from the load cell 30 are coupled to a desired conventional signal conditioning, amplifying and analog-to-digital conversion set of circuits so that they may be received and processed by microcontroller 54.
  • Microcontroller 54 Microcontroller
  • Display 54 uses such signals, computes, stores, outputs, and sends for display as desired, output signals 56 which are a function of the load placed on a particular load cell 30.
  • Display 58 may be a conventional LED, LCD or other display which receives such signals and creates a display 58 showing a value which is a function of such load, such as fluid volume.
  • One display 58 may correspond to a particular load cell 30 as shown in FIG. 1. or one display 58.
  • microcontroller 54. and/or other components may receive signals from any number of load cells 30 corresponding to various containers of bodily fluids, in order to monitor and track fluids in a number of containers collectively or partially collectively. Such signals may also be sent to an input/output port 60, such as a standard RS232 port, for output.
  • Microcontroller 54 contains computer programming which allows it to tare out the weight of disposable liners 16, receptacles 18, other portions of canisters 14. and loads applied by tubing 15. These values may be preset into microcontroller 54 at point of manufacture or through serial port 60 as desired. The tare process may also be accomplished manually by zeroing out the value displayed on display 58 with an empty canister 14 loaded and connected as appropriate to tubing 15. Any additional fluid accretion will then start the monitoring, storing and display processes from ground zero.
  • microcontroller 54 is adapted to allow canisters 14 or disposable liners 16 to be changed out without requiring the operator to remember the total and then add it to what is displayed when a new canister begins to be filled. Instead, microcontroller 54 "remembers” or “holds” automatically the current value corresponding to the cumulative weight ofthe fluid in the canister 14 when it is sensed to have been removed by load cell 30. The monitoring process is resumed when the new canister 14 or disposable liner 16 with lid 22 is put in place.
  • Logic flow for a preferred embodiment of systems according to the present invention is shown in Fig. 4.
  • the microcontroller goes through an initialization sequence to configure its environment.
  • the initialization routine configures the input/output digital data ports: the serial communication interface; the analog-to-digital (A/D) converter; the auto-calibration mode; the multiplexed display module; the internal interrupts; the internal timer; and other RAM variables.
  • the display shows " " indicating to user that the microcontroller is continuously updating the current load cell value and awaiting actuation of the start button.
  • the microcontroller fetches current load cell value about every 300 milliseconds; it then updates the current baseline value (tare weight) by keeping a running average of sixteen prior input samples.
  • the display Upon detection of start button closure, the display will read "0000" indicating the actual incremental value of the weight. Any positive change in weight as a result of fluid build-up, over and above the tare weight, will be registered on the display on a continuous basis.
  • the current load-cell value is fetched (every 300 milliseconds); running average of sixteen prior samples is maintained; the actual value is calculated by subtracting the baseline value from the averaged current value: the actual value is scaled to represent the displayed digits in decimal mode as cubic centimeter (cc) volume, with the leading zeros suppressed; and the display is updated.
  • This sequence is maintained until the reset button is pressed or the power is re-cycled.
  • a periodic check is made for any request via the serial communication port. If a request is detected, the current displayed value is also transmitted out over the serial link to the requesting device.

Abstract

L'invention concerne des dispositifs (10) de régulation des fluides extraits chez des patients, par exemple en chirurgie. Un capteur de force (30) détecte automatiquement le poids du fluide dans une cartouche de type classique ou autre (14) rattachée au capteur de force (30). Celui-ci (30) transmet en sortie ou modifie les signaux qui correspondent aux charges. Le régulateur (34) qui reçoit les signaux calcule les valeurs correspondant au poids et au volume du fluide recueilli dans la cartouche (14) et transmet les signaux en question, y compris le cas échéant des valeurs cumulatives, aux fins de présentation (58), de mémorisation, ou d'utilisation par des dispositifs extérieurs, (par exemple par l'intermédiaire d'un port série). Le régulateur (34) est conçu pour tarer automatiquement le poids des cartouches (14) et des charges inhérentes à la tubulure flexible (15) reliées auxdites cartouches (14), et il 'retient' automatiquement les valeurs correspondant à la chemise (16) d'une cartouche extraite (une fois remplie), si bien que le processus de régulation peut reprendre lorsqu'une nouvelle cartouche vide (14) est mise en place.
PCT/US1996/014770 1995-09-18 1996-09-16 Dispositifs de regulation des fluides extraits par succion WO1997010856A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72386/96A AU7238696A (en) 1995-09-18 1996-09-16 Devices for monitoring fluids removed by suction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52949995A 1995-09-18 1995-09-18
US08/529,499 1995-09-18

Publications (2)

Publication Number Publication Date
WO1997010856A1 WO1997010856A1 (fr) 1997-03-27
WO1997010856A9 true WO1997010856A9 (fr) 1997-05-01

Family

ID=24110165

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/014770 WO1997010856A1 (fr) 1995-09-18 1996-09-16 Dispositifs de regulation des fluides extraits par succion

Country Status (2)

Country Link
AU (1) AU7238696A (fr)
WO (1) WO1997010856A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770292B1 (fr) * 1997-10-24 1999-12-10 Serac Group Dispositif de pesage de recipients par prehension en porte-a-faux
US10052425B2 (en) 2013-03-15 2018-08-21 Gambro Lundia Ab Reservoir status lights indicating status of corresponding reservoirs for extracorporeal blood treatment apparatus
CN103815974B (zh) * 2014-03-18 2016-04-06 美昕医疗器械（上海）有限公司 用于医疗废液收集系统的支架
EP3132253B1 (fr) 2014-04-15 2019-02-13 Gauss Surgical, Inc. Procédé d'estimation d'une quantité d'un composant sanguin dans un réservoir de fluide
EP2992911A1 (fr) * 2014-09-02 2016-03-09 Medela Holding AG Dispositif de suspension d'un récipient de drainage
WO2016187071A1 (fr) 2015-05-15 2016-11-24 Gauss Surgical, Inc. Systèmes et procédés pour évaluer des fluides chez un patient
EP3393539B1 (fr) * 2015-12-23 2023-12-27 Gauss Surgical, Inc. Système et procédé permettant d'estimer une quantité d'un composant sanguin dans un volume de fluide
CN112999442A (zh) * 2021-02-22 2021-06-22 南京市儿童医院 一种儿童外科感染负压封闭吸引系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289158A (en) * 1976-09-10 1981-09-15 C. R. Bard, Inc. Suction control apparatus
US4974596A (en) * 1987-12-14 1990-12-04 Medex, Inc. Transducer with conductive polymer bridge
IE69670B1 (en) * 1988-11-24 1996-10-02 James Sheehan Medical swab weighing apparatus
US5149325A (en) * 1991-02-25 1992-09-22 Baxter International Inc. Vacuum system for auto transfusion device
JP3177295B2 (ja) * 1992-04-30 2001-06-18 株式会社ハヤブサ技研 デジタル廃液測定機

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