WO2008012278A1 - Récipient, dispositif d'aspiration et système pour le traitement sous vide maintenant une pression de traitement fixe - Google Patents

Récipient, dispositif d'aspiration et système pour le traitement sous vide maintenant une pression de traitement fixe Download PDF

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Publication number
WO2008012278A1
WO2008012278A1 PCT/EP2007/057535 EP2007057535W WO2008012278A1 WO 2008012278 A1 WO2008012278 A1 WO 2008012278A1 EP 2007057535 W EP2007057535 W EP 2007057535W WO 2008012278 A1 WO2008012278 A1 WO 2008012278A1
Authority
WO
WIPO (PCT)
Prior art keywords
wound
pressure
regulator
canister
pump
Prior art date
Application number
PCT/EP2007/057535
Other languages
English (en)
Inventor
Klaus Budig
Nicolai SØRENSEN
Original Assignee
Coloplast A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coloplast A/S filed Critical Coloplast A/S
Priority to EP07787783A priority Critical patent/EP2046412A1/fr
Priority to US12/309,596 priority patent/US20090326488A1/en
Publication of WO2008012278A1 publication Critical patent/WO2008012278A1/fr

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Classifications

    • 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
    • A61M1/71—Suction drainage systems
    • A61M1/78—Means for preventing overflow or contamination of the pumping systems
    • A61M1/784—Means for preventing overflow or contamination of the pumping systems by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
    • 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
    • A61M1/60—Containers for suction drainage, adapted to be used with an external suction source
    • 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
    • A61M1/71—Suction drainage systems
    • A61M1/74—Suction control
    • 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
    • A61M1/96—Suction control thereof
    • A61M1/966—Suction control thereof having a pressure sensor on or near the dressing
    • 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
    • A61M1/96—Suction control thereof
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • A61M2205/3344—Measuring or controlling pressure at the body treatment site

Definitions

  • the present invention relates to a system for vacuum treatment, a suction device for removal of effluents, in particular exudates, and a canister for collection of effluents, in particular exudates from a wound.
  • open wounds may be treated by providing vacuum in the space above the wound to promote healing. This process is often described as Vacuum Treatment or Suction Wound Drainage.
  • Vacuum treatment is a complex treatment to be carried out e.g. by a nurse in a hospital due to the many steps to be carried out before the actual vacuum treatment can be initiated.
  • the nurse has to make sure that the wound is sealed tightly with a draining device, such as a suction head, that allows for fluids from the wound to be sucked away from the wound.
  • the nurse also has to see to that the draining device is properly connected with a suction device.
  • the draining device may be connected directly with the suction device or the draining device may be connected via a conduit to the suction device. Further more, the nurse has to make sure that the rather complex suction device provides the right treatment pressure, prescribed by the doctor, since this is crucial for the effect of the treatment.
  • a precise control of the pressure level in vacuum treatment systems is desired to ensure appropriate wound treatment.
  • pressure control is often complicated by leakages in the wound enclosure or in conduits connecting the wound with the pump, or by occlusions caused solid or semi-solid matter drawn from the wound. Removal of an occlusion may take unacceptably long, and sometimes even requires interruption of the pump operation to exchange or rinse a conduit, if the pump is not capable of generating a sufficiently high pressure drop across the occlusion to overcome mechanical forces keeping the occlusion in place. It has been found particularly difficult to remove occlusions at far distal portions of a conduit connecting the wound with a source of suction, i.e. portions of a conduit which are immediately next to the wound or even within the wound.
  • a canister for collection of effluents, in particular exudates, from a wound during vacuum treatment comprising, an outlet to the surroundings, a wound inlet, a pump head having a pump inlet and a pump outlet, and a regulator regulating the pressure at the wound, the regulator securing a fixed treatment pressure.
  • a canister is provided that ensures that the treatment pressure cannot be changed after the set up of a system for vacuum treatment comprising the canister. This is beneficial since this reduces the risk of mistreatment because it is not possible for e.g. a patient or another person to change the treatment pressure after the set up.
  • the regulator is permanently secured to or integrated in the canister.
  • the term "fixed treatment pressure" may imply that there the possibility of setting or adjusting the treatment pressure is excluded, once the canister has been manufactured. Hence a fixed treatment pressure may be understood as a non-modifiable treatment pressure.
  • the pump head typically comprises mainly mechanical parts and will in use be connected to a drive unit. It is in the pump head that a negative pressure or even vacuum is created.
  • the drive unit operates the pump head, so that a flow is created in the pump head.
  • the flow rate created by the pump head is regulated by the drive unit.
  • a fluid from a wound may comprise effluents and exudates.
  • the regulator further comprises a regulator element and the fixed treatment pressure can be chosen among a number of treatment pressures in the regulator, and that the chosen treatment pressure is secured by the regulator element thereby securing the fixed treatment pressure to be the chosen treatment pressure.
  • the canister only allows for one fixed treatment pressure since this reduces the number of steps the nurse has to carry out when setting up the system for vacuum treatment, consequently also reducing the risk of choosing the wrong treatment pressure.
  • the regulator allows for choosing among a number of treatment pressures only one type of canister may be kept on stock.
  • a canister wherein the regulator regulates the pressure by sensing the pressure in the wound and in response hereto regulates the operation speed of suction of the pump head is provided.
  • the regulator may b ⁇ arranged to allow air into the wound if the pressure at the wound is less than the fixed treatment pressure, so as to increase the pressure in the wound.
  • an occlusion may be efficiently removed, as the occlusion is not only affected by negative pressure downstream of the occlusion, but also by a positive pressure upstream of the wound. For example, ambient air may be drawn into the wound and from there into a conduit connecting the wound with a suction source.
  • a source of positive pressure may be provided to apply a pressure above atmospheric pressure to the upstream side of the occlusion.
  • a pressure side of the pump providing suction in the system may be connected to the regulator to provide a positive pressure.
  • a separate pump may be provided as a positive pressure source.
  • the regulator further comprises a regulator spring and a regulator outlet, such that if in use the pressure in the wound is less than the fixed treatment pressure, air is allowed through the regulator outlet and into the wound thereby increasing the pressure in the wound.
  • a canister wherein the regulator further comprises a filter element thereby securing that only non-contaminated gas is let through the regulator outlet is provided.
  • the filter element could e.g. be an odour filter, an antibacterial filter or combinations hereof. By filtering the fluid unwanted characteristics, like odour or bacteria, of the fluid can be reduced and maybe even removed.
  • a canister wherein the wound inlet and the pump inlet are connected such that the pressure in the canister is approximately the same as the pressure in the surroundings is provided.
  • the shell be made of a hard material such as a hard plastic, or the shell can be made of soft material e.g. so that is constitutes a bag such as a plastic bag.
  • the fluids from the wound is lead through the pump head and in this way dress the pump head thus providing for a better performance of a system for vacuum treatment comprising such a canister.
  • Another embodiment provides a canister wherein the wound inlet is connected to a part of the shell of the canister such that in use the pressure inside the canister is less than the pressure at the surroundings, and that the pump inlet is in contact with the inside of canister, such that in use canister fluid is sucked into the pump head via the pump inlet and wound fluid is sucked from the wound out through the wound inlet to the inside of the canister thus mixing the wound fluid into the canister fluid.
  • a suction device for removal of effluents, in particular exudates, from a wound during vacuum treatment
  • the suction device comprising a canister with a wound inlet, a pump head having a pump inlet and a pump outlet, adrive unit operating the pump head, an outlet to the surroundings, and a regulator regulating the pressure at the wound, the regulator securing a fixed treatment pressure.
  • An embodiment provides a suction device, wherein the regulator further comprising a regulator element and wherein the fixed treatment pressure can be chosen among a number of treatment pressures in the regulator and that the chosen treatment pressure is secured by the regulator element thereby securing the fixed treatment pressure to be the chosen treatment pressure.
  • a suction device wherein the regulator regulates the pressure by sensing the pressure in the wound and in response hereto regulates the operation speed of suction of the pump head.
  • the regulator may be arranged to allow air into the wound if the pressure at the wound is less than the fixed treatment pressure, so as to increase the pressure in the wound.
  • an occlusion may be efficiently removed, as the occlusion is not only affected by negative pressure downstream of the occlusion, but also by a positive pressure upstream of the wound.
  • ambient air may be drawn into the wound and from there into a conduit connecting the wound with a suction source.
  • a larger pressure difference exists across the occlusion than if pressure upstream of the occlusion was kept at the negative level it used to be before the occlusion occurred.
  • the occlusion is not only sucked through the conduit by a downstream suction pressure, but also pushed by positive pressure at the upstream side of the occlusion.
  • a source of positive pressure may be provided to apply a pressure above atmospheric pressure to the upstream side of the occlusion.
  • a pressure side of the pump providing suction in the system may be connected to the regulator to provide a positive pressure.
  • a separate pump may be provided as a positive pressure source.
  • a suction device wherein the regulator further comprises a regulator spring and a regulator outlet, such that if in use the pressure in the wound is less than the fixed treatment pressure, air is allowed through the regulator outlet and into the wound thereby increasing the pressure at the wound.
  • a suction device wherein the regulator comprises a filter element thereby securing that non-contaminated gas is let through the regulator outlet.
  • Another embodiment provides a suction device, wherein the canister is according to the first aspect of the invention.
  • a system for vacuum treatment of a wound comprising a suction device according to a second aspect of the invention, a wound cover, and a conduit part connecting the wound cover and the wound inlet.
  • An embodiment of the system for vacuum treatment of a wound comprises a suction device, a wound cover, and a conduit part connecting the wound cover and the wound inlet, the conduit part comprising a first conduit and a second conduit.
  • the first conduit may e.g. be used for suction of fluid from the wound and the second conduit may be used for regulating the pressure in the wound.
  • a system comprising a suction head at least partly placed under the wound cover.
  • the suction head may be connected to the conduit part.
  • the conduit part comprises a suction head at least partly placed under the wound cover, a first conduit and a second conduit, the first conduit being connected with the suction head.
  • the invention further provie a method for removal of fluids from a wound, the method comprising:
  • the wound cover may e.g. form a cavity with an opening surrounded by an edge portion which facilitates an essentially gas tight transition to the skin of the treated living being, e.g. via a soft resilient adhesive material.
  • the wound cover may be occlusive or semi-occlusive, e.g. being vapor permeable but water impermeable.
  • the pump may produce a pressure difference, which is sufficient to draw liquids away from the wound, e.g. a negative pressure in the range of 10 to 600 mm Hg.
  • the negative pressure may be determined as a relative pressure or as an absolute pressure.
  • the air pressure of ambient space is the surrounding atmospheric air pressure
  • the air pressure of ambient space is a reference air pressure of a reference space, i.e. an enclosed volume that has a pressure relative to which the vacuum pressure is measured.
  • Pressure detection means may further be included.
  • the pressure detection means are typically located remote from the wound, e.g. in connection with a pump head, driver unit or control unit.
  • the pressure over the wound may be kept substantially constantly negative or it may alternate between different values of negative pressure and the pressure of the ambient air. It is preferred to control the pressure fit in a window defined by an upper and a lower level.
  • the effluent from the wound to be removed by suction is in the form of a fluid comprising a mixture of liquid and gas. When this mixture enters the first tube connecting the pump and the wound enclosure, the liquid may from time to time fill the tube to form a liquid string and thus block the free passage of gas through the tube. This may influence on the pressure in the enclosure as well as on the measurement of the pressure, as it may give rise to fluctuations in the pressure over the wound and inaccurate determination of the pressure.
  • the present method surprisingly provides a solution to this problem by incorporating a first valve that can be operated to provide a connection between the first tube and the ambient air.
  • the valve may be opened for only a short period, thus providing a gas stream through the conduit between the enclosure and the pump, establishing free passage of air and providing a reliable determination of the pressure.
  • the valve may be open long enough to provide a gas stream, but short enough to maintain a negative pressure in the enclosure.
  • the valve may be operated while the pump is working in order not to increase pressure in the enclosure.
  • the operation of the valve may be automatic, activating the valve within regular intervals or the valve may be operated by a signal from the pressure detection means or a control unit.
  • the valve may b ⁇ activated when a predetermined level of pressure is reached, if the upper level is reached, the valve may be opened, if the lower level is reached, the valve may be closed and optionally a signal for the pump to increase negative pressure may be sent.
  • Pressure sensing means may not be provided, but the system may be adjusted to a satisfactory pressure level, and intermittently activation of the valve may serve to maintain the pressure level.
  • the valve may be opened for a short period to purge the first tube, and a measurement of the pressure may be conducted immediately after, to achieve a correct pressure determination.
  • the system comprises a control unit.
  • the control unit receives information about the pressure, the pump and the valve, and combines the information to adjust the activity of the pump and/or valve in order to maintain the desired pressure over the wound.
  • the first valve may be manually operated.
  • the first valve is preferably located at the end of the first tube being connected to the enclosure. This location enables a gas flow through substantially the entire first tube when the first valve is activated, thus purging the tube from any liquid strings.
  • the first valve of the present may be operated to be in a closed or open position.
  • the pump may be stopped when sufficient negative pressure is achieved, and started again when the negative pressure decreases.
  • a bleeding hole is constantly open, and requires constant work of the pump in order to maintain negative pressure. Constant operation of the pump is power consuming and may be noisy and can be a nuisance to the patient.
  • the first valve may be connected to the first tube via a second tube.
  • the tube attached to the wound enclosure may be divided into a fork of a first tube, connecting to the pump, and a second tube connecting to the first valve.
  • the first tube may be provided with a second valve between the enclosure and the first valve.
  • This second valve is preferably closed when the first valve is open.
  • Such second valve may not b ⁇ necessary if the pump is strong enough, as this may maintain the pressure over the wound even when the first valve is open.
  • the second valve may be operated manually or by a signal from the first valve or the pressure detection means or control unit, but preferably the valve is opened/closed automatically by the pressure in the tube.
  • the second valve is open when the pressure in the enclosure is higher than the pressure in the tube.
  • a suitable valve for such purpose may be a one-way valve, e.g. a duck valve.
  • the method may further comprise providing a canister for receiving the liquid, and separating the gas from the liquid of the wound fluid.
  • the canister is preferably located in connection with the pump.
  • the pump may comprise a pump head for leading the fluid and a drive unit for driving the pump.
  • the canister may be located before or after the pump.
  • the canister may comprise absorbent material.
  • the method may further comprise providing separating means, for separating the fluid into gas and liquid.
  • the pressure detection means may produce a signal to the control unit or to the first valve when a predetermined pressure level is reached.
  • the invention further provides to a suction system for removal of fluids from a wound site, the system comprising:
  • a wound cover which is attachable to a wound circumference of a living being thereby to form an enclosure thereby sealing the wound site from the ambient air
  • a pump in fluid communication with the enclosure to provide a pressure difference between a suction pressure in the enclosure and an air pressure of an ambient space
  • first valve being capable of providing fluid communication between the first tube and the ambient air.
  • the system may be provided with pressure detection means.
  • the system may further comprise a control unit, controlling one or more of the operations of the system, e.g. recording the pressure and adjusting the activity of the pump and/or the valve in order to maintain a predetermined negative pressure.
  • a control unit controlling one or more of the operations of the system, e.g. recording the pressure and adjusting the activity of the pump and/or the valve in order to maintain a predetermined negative pressure.
  • the first valve may be connected to the first tube via a second tube.
  • the first tube may comprise a second valve located between the enclosure and the first valve.
  • the second valve may be closed when the first valve is open or the second valve may be open when the pressure in the enclosure is higher than the pressure in the tube.
  • a canister may be provided in the system, the canister may e.g. be located before or after the pump.
  • Fig. 1 shows one embodiment of the invention
  • Fig.2 shows another embodiment of the invention
  • Fig.3 shows a detailed view of a part of the invention
  • Figs.4 is illustrates an embodiment of the invention
  • Figs.5-11 are operational charts of embodiments of the invention.
  • Fig. 12 illustrates an embodiment of a canister according to the invention.
  • Figure 1 shows a schematic drawing of the system.
  • the wound cover (1 ) is sealing the wound to form an enclosure.
  • Fluid in the form of air and liquid wound exudate are transported by suction through a first tube (2) by negative pressure created by the pump head (4) and drive unit (13).
  • the first tube (2) may comprise several parts and different fittings can be added.
  • the first tube (2) is connected to the pump head (4) by an inlet (3).
  • the air and exudate are transported through the pump head (4) and by an outlet (5) to a canister (6).
  • the canister can be any kind of volume suitable for collecting and/or separating air and liquid, such as a flexible bag.
  • the canister (6) In the canister (6), air and liquid are separated into two phases. The air will pass through the outlet (8) and the liquid will be retained in the canister (6).
  • the canister may contain an absorbent component.
  • the outlet (8) of the canister may be provided with a filter (7) for removal of undesired components of the effluent gas.
  • the pump head (4) is connected to the drive unit (13).
  • the pump head may be disposable.
  • a second tube (9) is connected to the first tube near the enclosure in one end and by an inlet (10) to a first valve (11) and filter (12) in the other end.
  • the first valve (11) will open and air will pass through the filter (12), second tube (9), first tube (2) and further through the rest of the system thus enabling free passage of gas through the first tube (2) and removal of any liquid strings.
  • Liquid strings in tubes/drains are contributing to an inaccuracy of the negative pressure in the system by inducing fluctuations in the pressure over the wound. These fluctuations are minimized by the use of the present system.
  • the drain/ tube (2), canister (6), disposable pump head (4), purge tube (9), valve (11), optionally filter (12) and filter (7) may be in the form of separate units or some or all of them may be integrated units.
  • the filter (7) can be a filter of any kind, a membrane or a combination of a filter and a membrane.
  • the filter may be hydrophobic or lipophobic or able to retain bacteria.
  • valve (11) Several parameters can be determinative for opening of the valve (11) e.g. time, pressure, power consumption and others.
  • Figure 2 shows another embodiment of the invention.
  • the wound is sealed by a wound cover (21 ) and air and exudate are transported through a first tube (22) by negative pressure created by the pump head (26) and drive unit (28).
  • the first tube (22) can comprise of several parts and different fittings can be added.
  • the exudate from the first tube (22) is collected in a canister (24).
  • the first tube (22) is connected to the canister (24) through an inlet (23).
  • the canister (24) gas and liquid are separated into two phases.
  • the canister (24) can contain an absorbent component.
  • the canister can be any kind of volume suitable for collecting/separate air and liquid.
  • the gas in the canister (24) is transported through an outlet (25) into the disposable pump head (26) by negative pressure.
  • a filter (27) can be placed after the disposable pump head (26), between the canister (24) and the disposable pump head (26) or both before and after the disposable pump head (26).
  • the disposable pump head (26) is connected to the drive unit (28).
  • a second tube (29) is connected to the sealed wound or semi sealed wound (21) in one end and by an inlet (30) to a first valve (31) and filter (32) in the other end.
  • first valve (31) will open and air will pass through the filter (32), second tube (29), first tube (22) and further through the rest of the system providing a first tube (22) without any liquid strings.
  • the first tube (22), canister (24), disposable pump head (26), second tube (29), first valve (31), filter (32) and filter (27) can be separate unit or some or all of them can be integrated units.
  • Figure 3 discloses a detailed view of an embodiment including two valves.
  • the first tube (2) is connecting the enclosure (34) to the pump (not shown), and the second tube (9) is connecting the first valve (11) to the first tube near the enclosure (34).
  • a second valve (33) is provided at the first tube, between the connection to the second tube (9) and the enclosure (34).
  • the second valve (33) may be open to fluids moving from the wound enclosure (34) towards the pump but not the other direction.
  • the first (11) valve When the first (11) valve is opened, the negative pressure decreases in the tubes (9, 2) and the valve (33) will close. Thus, the negative pressure over the wound will be maintained substantially unaffected by the opening of the first valve.
  • the first valve (11) When the first valve (11) is closed again, the negative pressure in the tubes (2,11) increases, due to the work of the pump, and the second valve will open again.
  • Fig. 4 discloses a system for vacuum treatment of a wound.
  • the system comprises a wound cover 100 sealed to the tissue around a wound 102, a suction head 104 that is at least partly placed under the wound cover 100 to drain fluid from the wound.
  • the suction head 104 is connected to a conduit part 106 connecting the wound with a suction device 108 so that when a negative pressure is created by the suction device fluid from the wound is transported via the conduit part 106 up to the suction device 108 e.g. via a tube.
  • the suction device comprises a canister and a drive unit and a pump head.
  • the pump head may e.g. be part of the canister or it may be part of the drive unit.
  • the suction head may be integrated in the conduit part 106.
  • the conduit part 106 is a tube.
  • the conduit part may comprise a first conduit used for suction of fluid from the wound and a second conduit that e.g. may be used for regulating the pressure in the wound or sensing the pressure in the wound or a combination of both.
  • a system like the one illustrated in Fig. 4 preferably operates with a flow from the wound around 0.5-1.2 l/min. Other flows may be used.
  • the canisters shown in Figs.5 - 11 should b ⁇ conceived as a container for collecting fluids from the wound. Thus even though the pump head, the filters, and the regulator are depicted as separated units, they may be integrated with e.g. the canister or the drive unit.
  • the figures should be conceived as a functional description of a system as laid out in Fig.4.
  • Fig.5 shows the airflow through an embodiment of a system as illustrated in Fig.4.
  • fluid is sucked from the wound 102 via a first conduit 110 (i.e. 106 in Fig.4) through a pump inlet into the pump or pump head 112 and out through the pump outlet into the canister 114.
  • Part of the fluid in the canister may exit from the canister to the surroundings via an outlet to the surroundings e.g. passing one or more filters as illustrated in Fig.5, such as a hydrophobic filter 116 and a charcoal filter 118.
  • the filters may have different function such as reducing odour such as a charcoal filter, and an antibacterial filter such as a hydrophobic filter.
  • the regulator 120 allows air from the surroundings and or gas originating from the canister 114 to enter into the wound.
  • Figs. 6-9 illustrate various conditions for a system like the one illustrated in Fig.5.
  • Fig.6 illustrates evacuation and standard operation of a system according to the one shown in Fig.5.
  • the regulator 120 does not allow air from the surroundings or the canister 114 to enter into the wound 102.
  • Evacuation stops when a predetermine pressure is reached the predetermined pressure may preferably be the wanted treatment pressure in the wound, though the predetermined pressure may refer to a pressure at another location in the system, so that it indirectly reflects the pressure in the wound.
  • the predetermined pressure should always reflect the wanted treatment pressure in the wound, i.e. the predetermined pressure is based on where in the system the regulator get its pressure input, so that the predetermined pressure is calibrated in order to reflect the wanted treatment pressure.
  • the system After evacuation the system enters to standard operation, when the pressure input to the regulator 120 reaches the predetermined pressure.
  • gas may start circulating in the system, so that no gas is emitted to the surroundings.
  • the regulator 120 ensures that the gas from the canister 114 is led into thewound 102, if the input pressure to the regulator 120, and thus also the pressure in the wound, falls below the predetermined pressure.
  • the regulator 120 ensures that no gas is led into the wound if the input pressure to the regulator exceeds the predetermined pressure. Examples of small variations in the pressure in the wound may b ⁇ around 15 mm Hg when a treatment pressure of 125 mm Hg in the wound is chosen.
  • Fig. 7 illustrates how the system operates if a leak e.g. in the wound cover appears.
  • the leakage flow F 4 may be up to about 0.9 l/min before it is not possible for the system to keep the predetermined pressure as the input pressure.
  • the leakage flow F 4 WiII be same as the flow to the surroundings F 3 .
  • the system will function, so that gas is let into the wound via the regulator flow F 2 if the input pressure to the regulator decreases the predetermined pressure.
  • the system will thus function as long as flow rate F 1 equals the sum of regulator flow F 2 and the flow to the surroundings F 3 .
  • Fig. 8 illustrates what happens if a conduit part 110 connecting the wound and the pump head 112 has an occlusion 122 caused by the fluid from the wound 102.
  • the drive unit stops operating the pump head 112 when the input pressure is around the predetermined pressure, the flow rate F 1 and the regulator flow F 2 equals 0 since this means that the occlusion 122 is stuck in the conduit part 110.
  • the pump head pressure P 1 will be lower than the pressure in the wound and thus a force will be applied to the occlusion 112, which may cause the occlusion to move towards the pump head 112 even when the pump head is not operating, and in this way it may be possible to remove the occlusion in the conduit 110.
  • the drive unit will stop operating the pump head 112.
  • the drive unit will start operating the pump head after a predetermined period of time.
  • the regulator 120 detects if the input pressure falls below the predetermined pressure after the drive unit has stopped operating the pump 112, and the regulator ensures that the drive unit starts operating the pump head 112.
  • Fig. 9 illustrates occlusion of a part of the path to the outlet to the surroundings. Occlusion may for example occur in a case where a filter is placed before the outlet to the surroundings in the canister 114 and the filter becomes occluded. I n Fig. 9, the occlusion is illustrated at 124. A stop criterion for such a situation could be when the flow rate F 1 and the regulator flow F 2 equals 0 and the pump head pressure P 1 and input pressure p 2 equals the pressure of the surroundings.
  • Fig. 10 shows the airflow through another embodiment of a system as illustrated in Fig.4. In this embodiment, compared to the one shown in Fig.5, the pump head 112 is placed after the canister 114 and before an antibacterial filter 116.
  • Fig. 11 shows the airflow through an embodiment of a system as illustrated in Fig.4.
  • the pump head 112 placed after the canister 114 and after at least one filter 116 and/or 118.
  • the filter may include at least one of an odour filter and an antibacterial filter.
  • the pump head is driven by a drive unit 113.
  • Pressure sensor 121 is provided between the regulator 120 and the wound 102 to measure a pressure at or near the wound.
  • Fig. 12 shows a canister 114 that e.g. may be used in a system as illustrated in Fig.5.
  • the pump head is part of the canister, the pump head having a pump inlet 126 and a pump outlet 128.
  • the canister also has awound inlet 130, which in use is fluidically connected with wound.
  • the wound inlet 130 and the pump inlet 126 are connected via an integral canister conduit.
  • the canister further has an outlet 132 to the surroundings and a regulator outlet 120, which in use is fluidically connected to the wound.
  • Reference numbers 1-16 in Fig. 12 refer to the following features:
  • Canister Shell which may be either be may of a hard material
  • Antibacterial filter such as a charcoal filter
  • the force of the pressure spring cannot be changed thus securing a fixed treatment pressure.
  • the force of the pressure spring may be varied resulting in different treatment pressures, so that when a certain treatment pressure has been chosen the force of pressure spring cannot be changed e.g. by use of a regulator element in form of a lock, hereby securing a fixed treatment pressure.

Abstract

La présente invention concerne un récipient, un dispositif d'aspiration et un système de collecte d'écoulements, notamment d'exsudats, sortant d'une plaie pendant un traitement sous vide, ce récipient comprenant un organe de pompe (112) et un régulateur (120) qui régule la pression dans la plaie (102) pour assurer une pression de traitement fixe. Le régulateur (120) peut réguler la pression en détectant la pression dans la plaie et en réponse à cette détection, commander le fonctionnement de l'organe de pompe. Le régulateur (120) peut être intégré à demeure dans un corps du récipient (114) de manière non amovible et/ou non accessible pour exclure la possibilité d'ajuster le réglage de la pression de traitement fixe. S'il est déterminé que la pression au niveau de la plaie (102) est inférieure à une pression de seuil, de l'air peut être autorisé à pénétrer dans la plaie.
PCT/EP2007/057535 2006-07-24 2007-07-20 Récipient, dispositif d'aspiration et système pour le traitement sous vide maintenant une pression de traitement fixe WO2008012278A1 (fr)

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EP07787783A EP2046412A1 (fr) 2006-07-24 2007-07-20 Récipient, dispositif d'aspiration et système pour le traitement sous vide maintenant une pression de traitement fixe
US12/309,596 US20090326488A1 (en) 2006-07-24 2007-07-20 Canister, Suction Device and System For Vacuum Treatment Securing a Fixed Treatment Pressure

Applications Claiming Priority (4)

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DKPA200601011 2006-07-24
DKPA200601011 2006-07-24
US83612906P 2006-08-08 2006-08-08
US60/836,129 2006-08-08

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WO2010011920A3 (fr) * 2008-07-25 2010-06-10 Boehringer Technologies, L.P. Système de pompe pour la thérapie d'une blessure sous pression négative et ses améliorations
US7857806B2 (en) 2005-07-14 2010-12-28 Boehringer Technologies, L.P. Pump system for negative pressure wound therapy
CN102421464A (zh) * 2009-04-30 2012-04-18 莫恩里克保健公司 用于控制伤口中的负压的设备及方法
JP2013505055A (ja) * 2009-09-22 2013-02-14 メンリッケ・ヘルス・ケア・アーベー 創傷内の負圧を制御する器具及び方法
US9033942B2 (en) 2008-03-07 2015-05-19 Smith & Nephew, Inc. Wound dressing port and associated wound dressing
US9050398B2 (en) 2010-12-22 2015-06-09 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
US9227000B2 (en) 2006-09-28 2016-01-05 Smith & Nephew, Inc. Portable wound therapy system
US9327065B2 (en) 2009-12-22 2016-05-03 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
US9474654B2 (en) 2008-08-08 2016-10-25 Smith & Nephew, Inc. Wound dressing of continuous fibers
US9801985B2 (en) 2007-12-06 2017-10-31 Smith & Nephew Plc Apparatus for topical negative pressure therapy
USD804014S1 (en) 2010-12-22 2017-11-28 Smith & Nephew, Inc. Suction adapter
USD806256S1 (en) 2012-05-23 2017-12-26 Smith & Nephew Plc Medical dressing
US9889241B2 (en) 2009-06-01 2018-02-13 Smith & Nephew, Inc. System for providing continual drainage in negative pressure wound therapy
USRE46825E1 (en) 2009-01-20 2018-05-08 Smith & Nephew, Inc. Method and apparatus for bridging from a dressing in negative pressure wound therapy
US10010658B2 (en) 2013-05-10 2018-07-03 Smith & Nephew Plc Fluidic connector for irrigation and aspiration of wounds
US10016545B2 (en) 2008-07-21 2018-07-10 Smith & Nephew, Inc. Thin film wound dressing
US10076449B2 (en) 2012-08-01 2018-09-18 Smith & Nephew Plc Wound dressing and method of treatment
US10076594B2 (en) 2015-05-18 2018-09-18 Smith & Nephew Plc Fluidic connector for negative pressure wound therapy
WO2019083966A1 (fr) * 2017-10-26 2019-05-02 Kci Licensing, Inc. Dispositif de thérapie de plaie par pression négative à purge de filtre automatisée
US10406036B2 (en) 2009-06-18 2019-09-10 Smith & Nephew, Inc. Apparatus for vacuum bridging and/or exudate collection
US10667955B2 (en) 2012-08-01 2020-06-02 Smith & Nephew Plc Wound dressing and method of treatment
USRE48117E1 (en) 2010-05-07 2020-07-28 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
US11607346B2 (en) 2017-11-01 2023-03-21 Smith & Nephew Plc Dressing for negative pressure wound therapy with filter
US11819386B2 (en) 2018-07-12 2023-11-21 T.J.Smith And Nephew, Limited Apparatuses and methods for negative pressure wound therapy

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US7857806B2 (en) 2005-07-14 2010-12-28 Boehringer Technologies, L.P. Pump system for negative pressure wound therapy
US9227000B2 (en) 2006-09-28 2016-01-05 Smith & Nephew, Inc. Portable wound therapy system
US10130526B2 (en) 2006-09-28 2018-11-20 Smith & Nephew, Inc. Portable wound therapy system
US11141325B2 (en) 2006-09-28 2021-10-12 Smith & Nephew, Inc. Portable wound therapy system
US9642955B2 (en) 2006-09-28 2017-05-09 Smith & Nephew, Inc. Portable wound therapy system
US10561769B2 (en) 2007-12-06 2020-02-18 Smith & Nephew Plc Apparatus for topical negative pressure therapy
US11433176B2 (en) 2007-12-06 2022-09-06 Smith & Nephew Plc Apparatus for topical negative pressure therapy
US11717655B2 (en) 2007-12-06 2023-08-08 Smith & Nephew Plc Apparatus for topical negative pressure therapy
US9801985B2 (en) 2007-12-06 2017-10-31 Smith & Nephew Plc Apparatus for topical negative pressure therapy
US9033942B2 (en) 2008-03-07 2015-05-19 Smith & Nephew, Inc. Wound dressing port and associated wound dressing
US9956329B2 (en) 2008-03-07 2018-05-01 Smith & Nephew, Inc. Wound dressing port and associated wound dressing
US10016545B2 (en) 2008-07-21 2018-07-10 Smith & Nephew, Inc. Thin film wound dressing
WO2010011920A3 (fr) * 2008-07-25 2010-06-10 Boehringer Technologies, L.P. Système de pompe pour la thérapie d'une blessure sous pression négative et ses améliorations
US9474654B2 (en) 2008-08-08 2016-10-25 Smith & Nephew, Inc. Wound dressing of continuous fibers
USRE46825E1 (en) 2009-01-20 2018-05-08 Smith & Nephew, Inc. Method and apparatus for bridging from a dressing in negative pressure wound therapy
JP2012525202A (ja) * 2009-04-30 2012-10-22 メンリッケ・ヘルス・ケア・アーベー 創傷において負圧を制御する装置及びその方法
CN102421464A (zh) * 2009-04-30 2012-04-18 莫恩里克保健公司 用于控制伤口中的负压的设备及方法
US8998865B2 (en) 2009-04-30 2015-04-07 Mölnlycke Health Care Ab Apparatus and method for controlling the negative pressure in a wound
US10828404B2 (en) 2009-06-01 2020-11-10 Smith & Nephew, Inc. System for providing continual drainage in negative pressure wound therapy
US9889241B2 (en) 2009-06-01 2018-02-13 Smith & Nephew, Inc. System for providing continual drainage in negative pressure wound therapy
US10406036B2 (en) 2009-06-18 2019-09-10 Smith & Nephew, Inc. Apparatus for vacuum bridging and/or exudate collection
JP2013505055A (ja) * 2009-09-22 2013-02-14 メンリッケ・ヘルス・ケア・アーベー 創傷内の負圧を制御する器具及び方法
US8998863B2 (en) 2009-09-22 2015-04-07 Mölnlycke Health Care Ab Apparatus and method for controlling the negative pressure in a wound
US9327065B2 (en) 2009-12-22 2016-05-03 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
US9974695B2 (en) 2009-12-22 2018-05-22 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
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US9050398B2 (en) 2010-12-22 2015-06-09 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
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US11247034B2 (en) 2010-12-22 2022-02-15 Smith & Nephew, Inc. Apparatuses and methods for negative pressure wound therapy
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