GB2483281A - Negative pressure wound therapy system and feedback control method - Google Patents

Negative pressure wound therapy system and feedback control method Download PDF

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Publication number
GB2483281A
GB2483281A GB1014617.3A GB201014617A GB2483281A GB 2483281 A GB2483281 A GB 2483281A GB 201014617 A GB201014617 A GB 201014617A GB 2483281 A GB2483281 A GB 2483281A
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GB
United Kingdom
Prior art keywords
negative pressure
wound
collecting bag
fluid
positive pressure
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB1014617.3A
Other versions
GB201014617D0 (en
GB2483281B (en
Inventor
Jhy-Wen Wu
Nan-Kuang Yao
Luo-Hwa Miau
Jen-Chien Chien
Li-Ling Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wellell Inc
Original Assignee
Apex Medical Corp
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 Apex Medical Corp filed Critical Apex Medical Corp
Priority to GB1014617.3A priority Critical patent/GB2483281B/en
Publication of GB201014617D0 publication Critical patent/GB201014617D0/en
Publication of GB2483281A publication Critical patent/GB2483281A/en
Application granted granted Critical
Publication of GB2483281B publication Critical patent/GB2483281B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • 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
    • A61M1/0031—
    • 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
    • A61M1/962—Suction control thereof having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
    • 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
    • A61M1/98—Containers specifically adapted for negative pressure wound therapy
    • A61M1/984—Containers specifically adapted for negative pressure wound therapy portable on the body
    • 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
    • A61M27/00—Drainage appliance for wounds or the like, i.e. wound drains, implanted drains
    • 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
    • A61M1/69—Drainage containers not being adapted for subjection to vacuum, e.g. bags
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/80—Suction pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
    • A61M1/96—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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Anesthesiology (AREA)
  • Hematology (AREA)
  • Vascular Medicine (AREA)
  • Otolaryngology (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • External Artificial Organs (AREA)

Abstract

A negative pressure wound therapy system creates a negative pressure environment in the opening 511 of a wound-dressing unit 50 and a positive pressure environment in a collecting bag 40. Then a positive pressure detecting procedure is proceeded in the positive pressure environment and a negative pressure detecting procedure is proceeded in the negative pressure environment. The detected results are sent to a controller 10 to determine whether a micropump 30 should be stopped or kept running. There may be a test mode prior to the operating mode (see figure 7). The fluid connections between the various components of the system may be detachable. There may be a check valve to prevent backflow from the container, and filters to prevent microbes from entering the sensors.

Description

NEGATIVE PRESSURE WOUND THERAPY SYSTEM AND A
FEEDBACK CONTROL METHOD FOR THE SAME
1. Field of the Invention
The present invention relates to a negative pressure wound therapy system and a feedback control method for the same, especially to a therapy system creating negative pressure in the wound environment to promote healing in wounds.
2. Description of the Prior Arts
Negative pressure wound therapy utilizes wound sheets, soft suction pads, or biocompatibility pore materials to attach on the wounds and connects to a vacuum pump. The vacuum pump creates negative pressure in the wound to extract the pus and infection subjects and to draw the healthy tissue fluid so that a moist therapy environment is maintained. Therefore, the blood circulation around the wound is promoted to accelerate wound healing.
One of the conventional negative pressure wound therapy systems has a rigid collector connecting to a front end of the vacuum pump to extract the pus and the infection subjects into the rigid collector. A negative pressure sensor detects the negative pressure in the collector to determine whether the traditional system is operated normally. However, since the vacuum pump is connected to the rear end of the rigid collector, the pump is further from the wound so that the pump needs more power to create negative pressure in the wound and to extract the pus and the infection subjects from the wound.
Another conventional negative pressure wound therapy system solves the above problem. The collector is connected to the rear end of the vacuum pump. The vacuum pump is directly connected to the wound sheet attached on the wound so that the vacuum pump uses less power. However, the collector does not have the same negative pressure environment as the wound. Therefore, the negative pressure sensor is not useful to detect.
To overcome the shortcomings, the present invention provides a negative pressure wound therapy system and a feedback control method for the same to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a negative pressure wound therapy system and a feedback control method for the same.
The system creates a negative pressure environment in the opening of a wound-dressing unit and a positive pressure environment in the collecting bag.
Then a positive pressure detecting procedure is proceeded in the positive pressure environment and a negative pressure detecting procedure is proceeded in the negative pressure environment. The detecting results are sent to determine whether a micro pump is stopped.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
IN THE DRAWINGS
Fig. 1 is a perspective view of a negative pressure wound therapy system in accordance with the present invention; Fig. 2 is a block diagram shown the connection of the negative pressure Fig. 3 is a perspective view of a wound-dressing unit of the negative pressure wound therapy system; Fig. 4 is an exploded perspective view of the negative pressure wound therapy system in Fig. 1; Fig. 5 is an exploded perspective view of a sensor assembly and an actuator of the negative pressure wound therapy system in Fig. 1; Fig. 6 is a partial perspective view of the actuator of the negative pressure wound therapy system in Fig. 1; Fig. 7 is a flow chart shown test mode of a feedback control method in accordance with the present invention for the negative pressure wound therapy system in Fig. 1; and Fig. 8 is a flow chart shown operating mode of the feedback control method for the negative pressure wound therapy system in Fig. 1.
With reference to Fig. 1, a negative pressure wound therapy system in accordance with the present invention comprises a controller 10, a sensor assembly 20, an actuator 30, a collector 40 and a wound-dressing unit 50.
With reference to Figs. 1 and 2, the controller 10 comprises a microprocessor 11, a power supply unit 12 and a control panel 13. The power supply unit 12 electrically connects to the microprocessor 11, provides electricity and may be a battery set, or may be a power converter connected to an external power source. The control panel 13 is attached to an outer surface of the controller 10 and electrically connects to the microprocessor 111 and the power supply unit 12.
The sensor assembly 20 comprises a negative pressure sensor 21, a positive pressure sensor 22 and a relief valve 23. The relief valve 23 adjusts the pressure of the system and may apply an intermittent mode.
The actuator 30 comprises a micro pump 31.
The collector 40 comprises a collecting bag 41 and a liquid absorber 42.
The liquid absorber 42 is mounted in the collecting bag 41.
With reference to Fig. 3, the wound-dressing unit 50 comprises a wound sheet 51 and a conduit 52. The wound sheet 51 has an opening 511. The conduit 52 is attached securely to the wound sheet 51 and is connected to the opening 511 and has a filter strip 521. The filter strip 521 is made of biocompatibility materials and keeps solid chips such as tissue fragment from flowing into the conduit 52. In a preferred embodiment, the conduit 52 is attached securely to the wound sheet 51 by ultrasonic welding.
With reference to Figs. 2 and 4, the negative pressure wound therapy system in accordance with the present invention comprises electrical connection and fluid connection to connect aforementioned elements.
The controller 10 is electrically connected to the sensor assembly 20, and the sensor assembly 20 is electrically connected to the actuator 30.
Detachable electrical wire set forms the electrical connection. For example, an electrical wire 61 with a plug 62 protrudes out from the sensor assembly 20.
The controller 10 has a corresponding socket 63. The plug 62 is plugged detachably into the socket 63 to form the electrical connection.
A fluid connection is formed between the pump inlet 311 of the micro pump 31 and the conduit 52. A fluid connection is formed between the pump outlet 312 of the micro pump 31 and the entry end of the collecting bag 41. A check valve is mounted in the entry end 411 of the collecting bag 41 to keep the liquid in the collecting bag 41 from flowing back to infect the wound.
Detachable fluid tube set forms the fluid connections. For example, a first tube 64 with a fluid connector 65 protrudes out from the micro pump 31 and a second tube 64 with a fluid connector 65 protrudes out from the conduit 52.
The fluid connectors 65 detachably connect to each other to form the fluid connection.
A fluid connection is formed between the positive pressure sensor 22 and the detecting end 412 of the collecting bag 41. A fluid connection is formed between the negative pressure sensor 21, the relief valve 23 and the conduit 52, especially through the pump inlet 311 of the micro pump 31. Detachable tube set forms the fluid connections. For example, a tube 64 with a first fluid connector 65 protrudes out from the positive pressure sensor 22. A second fluid connector 65 is mounted on the detecting end 412 of the collecting bag 41. The fluid connectors 65 detachably connect to each other to form the fluid connection.
With reference to Figs. 5 and 6, in a preferred embodiment the sensor assembly 20 has a first connecting interface 201, and the actuator 30 has a second connecting interface 301. The first connecting interface 201 has a first electrical connector 202 and a first fluid connector 203. The second connecting interface 301 has a second electrical connector 302 and a second fluid connector 303. The micro pump 31 is electrically connected to the second electrical connector 302. The connecting interfaces 201, 301 are connected detachably to each other. The first electrical connector 202 is connected to the second electrical connector 302. The first fluid connector 203 is connected to the second fluid connector 303. A fluid division 66 may be a manifold and comprises a first passage 661 and a second passage 662. The first passage 661 connects the pump inlet 311 of the micro pump 31 and the conduit 52. The second passage 662 connects the second fluid connector 303 and the conduit 52.
Furthermore, filters 70 are mounted in the detecting end 412 of the collecting bag 41 and the second fluid connector 303 of the actuator 30 to keep the infections from flowing into the sensor assembly 20.
With the aforementioned electrical connections and the fluid connections being detachably, the elements are available to detach from each other to be repaired independently When the system as described is operated, the wound sheet 51 covers the wound of the patient with the opening 511 facing the wound. The user actuates the micro pump 31 through the control panel 13. The micro pump 31 creates a negative pressure environment in the wound through the fluid connections and extracts the pus and infection subjects from the wound. The pus and infection subjects pass through the actuator 30 and are collected in the collecting bag 41.
The system as described has following advantages.
1. Since all of the components connect to each other by detachable electrical wire sets and detachable tube sets, each component is available to be disassembled and repaired independently 2. The components have different lifespan. For example, the collector and the wound-dressing unit 50 directly contact the infections so that the collector 40 and the wound-dressing unit 50 need to be replaced frequently while the controller 10, the actuator 30 and the sensor assembly 20 can be used for a long time. Therefore, the detachable connections are convenient for users to disassemble and replace each component.
3. When the user moves between different places such as hospital and home, the detachable connections allow the user only bring some of the components to move. For example, the user only carries the controller 10, the sensor assembly 20 and the actuator 30, and leaves the collectors 40 and the wound-dressing units 50 at different places, and vice versa. Therefore, the user only needs to carry part of the system.
4. In the fluid connections, the actuator 30 is located in front of the collecting bag 41. The micro pump 31 is directly connected to the wound sheet attached on the wound so that the micro pump uses less power.
To ensure the system as described is operated safely, a feedback control method in accordance with the present invention for the system as described comprises a test mode and an operating mode.
With reference to Fig. 7, when the system as described is started, the system enters the test mode. The micro pump 31 inflates the fluid connections in the system. Then the positive pressure sensor 22 detects whether the positive pressure at the detecting end 412 of the collecting bag 41 is normal. When the fluid connections are not connected properly, the positive pressure is abnormal.
If the positive pressure is abnormal, the system outputs an alarm signal. Then the test mode is ended. When the fluid connections are connected properly, the positive pressure is normal. If the positive pressure is normal, the system enters the operating mode.
With reference to Fig. 8, when the system enters the operating mode, the micro pump 3 1 creates a negative pressure environment in the wound through the opening 511 of the wound sheet 51 and extracts the pus and infection subj ects from the wound. Then the collecting bag 41 is accordingly formed as a positive pressure environment. Then the positive pressure detecting procedure and negative pressure detecting procedure are started.
The positive pressure detecting procedure detects the positive pressure in the collecting bag 41. The positive pressure sensor 22 detects whether the positive pressure in the collecting bag 41 is normal. When the fluid connections between the collecting bag 41 and other elements are disconnected, or an external overload is applied to the collecting bag 41, or the collecting bag 41 is full of liquid, the positive pressure of the detecting end 412 of the collecting bag 41 is abnormal. If the positive pressure is abnormal, the positive pressure sensor 22 sends a signal to the microprocessor 11 to stop the micro pump 31 and send an alarm signal to notify the user. Therefore, the pus and the infection subjects are prevented from leaking out of the fluid connections or the collecting bag 41 is prevented from breaking because of overload or being frill.
Then the operating mode is ended. If the positive pressure is normal, the positive pressure sensor 22 keeps processing the positive pressure detecting procedure.
The negative pressure detecting procedure detects the negative pressure in the wound. The negative pressure sensor 21 detects whether the negative pressure in the opening 511 of the wound sheet 51 is normal. When the fluid connections is obstructed or is disconnected, the negative pressure is abnormal.
If the negative pressure is abnormal, the negative pressure sensor 21 sends a signal to the microprocessor 11 to stop the micro pump 31 and send an alarm signal to notify the user. If the negative pressure is normal, the negative pressure sensor 23 keeps processing the positive pressure detecting procedure.
With the aforementioned modes, the system as described is operated safely.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only.
Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims (13)

  1. CLAIMS: 1. A feedback control method for a negative pressure wound therapy system that the system has a wound-dressing unit (50) and a collecting bag (41) communicating with the wound-dressing unit (50), the method comprising an operating mode, which comprises acts of: (a) creating a negative pressure environment in an opening (511) of a wound-dressing unit (50) and a positive pressure environment in the collecting bag (41); (b) proceeding a positive pressure detecting procedure in the positive pressure environment and proceeding a negative pressure detecting procedure in the negative pressure environment; and (c) sending the detecting results to determine whether the operating mode is ended.
  2. 2. The feedback control method as claimed in claim 1, wherein before step (a) further comprises an act of applying a micro pump (31) between the wound-dressing unit (50) and the collecting bag (41) to creating the negative pressure environment and extracting the fluid in the opening (511).
  3. 3. The feedback control method as claimed in claim 2, wherein positive pressure detecting procedure further comprises acts of: detecting the positive pressure in a detecting end (412) of the collecting bag (41) by a positive pressure sensor (22); and determining whether the positive pressure is normal; if the positive pressure is abnormal, the micro pump (31) is stopped and the operating mode is ended; if the positive pressure is normal, the micro pump (31) is kept operating and back to the act of the detecting positive pressure.
  4. 4. The feedback control method as claimed in claims 2 or 3, wherein negative pressure detecting procedure further comprises acts of: detecting the negative pressure in the opening (511) of the wound-dressing unit (50) by a negative pressure sensor (21); and determining whether the negative pressure is normal; if the negative pressure is abnormal, the micro pump (31) is stopped and the operating mode is ended; if the negative pressure is normal, the micro pump (31) is kept operating and back to the act of the detecting negative pressure.
  5. 5. The feedback control method as claimed in any claim of claims 2 to 4 further comprising a test mode before proceeding the operating mode, wherein the test mode comprises acts of: inflating fluid connections in the system by the micro pump (31); detecting the positive pressure in a detecting end (412) of the collecting bag (41) by a positive pressure sensor (22); and determining whether the positive pressure is normal; if the positive pressure is abnormal, an alarm signal is output and the test mode is ended; if the positive pressure is normal, the test mode is end and the operating mode is entered.
  6. 6. A negative pressure wound therapy system comprising: a controller (10); a sensor assembly (20) electrically connected to the controller (10) and comprising a negative pressure sensor (21) and a positive pressure sensor (22) to detect pressure, and comprising a relief valve (23); an actuator (30) comprising a micro pump (31) electrically connected to the sensor assembly (20); a collector (40) comprising a collecting bag (41); a wound-dressing unit (50) having an opening (511); a first fluid connection connecting between the sensor assembly (20) and the collecting bag (41); a second fluid connection connecting between the sensor assembly (20) and the wound-dressing unit (SO); a third fluid connection connecting between the wound-dressing unit (50), the actuator (30) and the collecting bag (41), wherein the actuator (30) is located between the wound-dressing unit (50) and the collecting bag (41) in the third fluid connection; whereby the micro pump (31) creates a negative pressure environment in the opening (511) through the third fluid connection and extracts the fluid from the opening (511) of the wound-dressing unit (50), and the fluid passes the actuator (30) to flow into the collecting bag (41), and the collecting bag (41) is defined as a positive pressure environment.
  7. 7. The negative pressure wound therapy system as claimed in claim 6 further comprising: a first detachable electrical wire set connecting between the sensor assembly (20) and the controller (10); a second detachable electrical wire set connecting between the sensor assembly (20) and the micro pump (31); a first detachable tube set connecting between a pump inlet (311) of the micro pump (31) and the sensor assembly (20); a second detachable tube set connecting between a detecting end (412) of the collecting bag (41) and the sensor assembly (20); a third detachable tube set connecting between an inlet end (411) of the collecting bag (41) and a pump outlet (312) of the micro pump (31); a fourth detachable tube set connecting between the wound-dressing unit (50) and the sensor assembly (20); and a fifth detachable tube set connecting between the wound-dressing unit (50) and the pump inlet (311) of the micro pump (31), wherein the first fluid connection is formed by the second detachable tube set; the second fluid connection is formed by the fourth detachable tube set; and the third fluid connection is formed by the first, third and fifth detachable tube sets.
  8. 8. The negative pressure wound therapy system as claimed in claim 7, wherein the wound-dressing unit (50) comprises a wound sheet (51), where the opening (511) of the wound-dressing unit (50) is formed through; and a conduit (52) attached securely to the wound sheet (51), connected to the opening (511) and having a filter (521) strip made of biocompatibility materials; the fourth detachable tube set connects between the conduit (52) and the negative pressure sensor (21) and the relief valve (23); and the fifth detachable tube set connects between the conduit (52) and the pump inlet (311) of the micro pump (31).
  9. 9. The negative pressure wound therapy system as claimed in claim 8 further comprising a fluid division (66), wherein the sensor assembly (20) has a first connecting interface (201) having a first electrical connector (202) and a first fluid connector (203); and the actuator (30) has a second connecting interface (301) connected detachably to the first connecting interface (201) and having a second electrical connector (302) electrically connected to the micro pump (31) connected to the first electrical connector (202); and a second fluid connector (303) connected to the first fluid connector (203); the fluid division (66) comprises a first passage (661) connecting the pump inlet (311) of the micro pump (31) and the conduit (52); and a second passage (662) connecting the second fluid connector (303) and the conduit (52).
  10. 10. The negative pressure wound therapy system as claimed in claims 8 or 9, wherein the fifth detachable tube set comprises a first tube (64) with a fluid connector (65) protruding out from the micro pump (31) and a second tube (64) with a fluid connector (65) protruding out from the conduit (52), and the fluid connectors (65) detachably connect to each other.
  11. 11. The negative pressure wound therapy system as claimed in claim 10, wherein the second detachable tube set comprises a tube (64) with a first fluid connector (65) protruding out from the positive pressure sensor (22) and a second fluid connector (65) mounted on the detecting end (412) of the collecting bag (41), and the fluid connectors (65) detachably connect to each other.
  12. 12. The negative pressure wound therapy system as claimed in claim 11 further comprising two filters (70) respectively mounted in the detecting end (412) of the collecting bag (41) and the second fluid connector (303) of the actuator (30) to keep the infections from flowing into the sensor assembly (20).
  13. 13. The negative pressure wound therapy system as claimed in claim 12 further comprising check valve mounted in an entry end (411) of the collecting bag (41) to keep the liquid in the collecting bag (41) from flowing back.
GB1014617.3A 2010-09-03 2010-09-03 Negative pressure fluid absorbent system and a feedback control method for the same Expired - Fee Related GB2483281B (en)

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Application Number Priority Date Filing Date Title
GB1014617.3A GB2483281B (en) 2010-09-03 2010-09-03 Negative pressure fluid absorbent system and a feedback control method for the same

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Application Number Priority Date Filing Date Title
GB1014617.3A GB2483281B (en) 2010-09-03 2010-09-03 Negative pressure fluid absorbent system and a feedback control method for the same

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GB201014617D0 GB201014617D0 (en) 2010-10-13
GB2483281A true GB2483281A (en) 2012-03-07
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Cited By (1)

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WO2016126560A1 (en) * 2015-02-02 2016-08-11 Kci Licensing, Inc. Pressure-operated switch

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GB2378734A (en) * 2001-08-14 2003-02-19 Carmeli Adahan Disposable pump with detachable motor
WO2007087809A1 (en) * 2006-02-02 2007-08-09 Coloplast A/S Device, pump and system for stimulating the healing of a wound
US20090012441A1 (en) * 2007-07-06 2009-01-08 Sharon Mulligan Subatmospheric pressure wound therapy dressing
WO2009005424A1 (en) * 2007-06-29 2009-01-08 Millicore Ab Improved pleural drainage device and valve for such
US20090204085A1 (en) * 2002-09-13 2009-08-13 Neogen Technologies, Inc. Closed wound drainage system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2378734A (en) * 2001-08-14 2003-02-19 Carmeli Adahan Disposable pump with detachable motor
US20090204085A1 (en) * 2002-09-13 2009-08-13 Neogen Technologies, Inc. Closed wound drainage system
WO2007087809A1 (en) * 2006-02-02 2007-08-09 Coloplast A/S Device, pump and system for stimulating the healing of a wound
WO2009005424A1 (en) * 2007-06-29 2009-01-08 Millicore Ab Improved pleural drainage device and valve for such
US20090012441A1 (en) * 2007-07-06 2009-01-08 Sharon Mulligan Subatmospheric pressure wound therapy dressing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016126560A1 (en) * 2015-02-02 2016-08-11 Kci Licensing, Inc. Pressure-operated switch
EP3616731A1 (en) * 2015-02-02 2020-03-04 KCI Licensing, Inc. Pressure-operated switch
US11207458B2 (en) 2015-02-02 2021-12-28 Kci Licensing, Inc. Pressure-operated switch

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Publication number Publication date
GB201014617D0 (en) 2010-10-13
GB2483281B (en) 2012-11-07

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