WO2011023384A1 - Vacuum therapy device comprising a pressure sensor - Google Patents

Vacuum therapy device comprising a pressure sensor Download PDF

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Publication number
WO2011023384A1
WO2011023384A1 PCT/EP2010/005222 EP2010005222W WO2011023384A1 WO 2011023384 A1 WO2011023384 A1 WO 2011023384A1 EP 2010005222 W EP2010005222 W EP 2010005222W WO 2011023384 A1 WO2011023384 A1 WO 2011023384A1
Authority
WO
WIPO (PCT)
Prior art keywords
wound
pressure sensor
vacuum
characterized
pressure
Prior art date
Application number
PCT/EP2010/005222
Other languages
German (de)
French (fr)
Inventor
Dirk Baumann
Johannes Meyer
Original Assignee
Vcs Medical Technology Gmbh
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
Priority to DE102009039336A priority Critical patent/DE102009039336A1/en
Priority to DE102009039336.6 priority
Application filed by Vcs Medical Technology Gmbh filed Critical Vcs Medical Technology Gmbh
Publication of WO2011023384A1 publication Critical patent/WO2011023384A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M27/00Drainage appliances for wounds or the like, i.e. wound drains, implanted drains
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/0023Suction drainage systems
    • A61M1/0025Suction drainage systems comprising sensors or indicators for physical values
    • A61M1/0027Visual indicating means for vacuum pressure
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/0023Suction drainage systems
    • A61M1/0031Suction control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/008Drainage tubes; Aspiration tips
    • A61M1/0088Drainage tubes; Aspiration tips with a seal, e.g. to stick around a wound for isolating the treatment area
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3331Pressure; Flow
    • A61M2205/3344Measuring or controlling pressure at the body treatment site
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/35Communication
    • A61M2205/3546Range
    • A61M2205/3561Range local, e.g. within room or hospital
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/35Communication
    • A61M2205/3576Communication with non implanted data transmission devices, e.g. using external transmitter or receiver
    • A61M2205/3592Communication with non implanted data transmission devices, e.g. using external transmitter or receiver using telemetric means, e.g. radio or optical transmission
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/60General characteristics of the apparatus with identification means

Abstract

A vacuum therapy device comprising a wound cover (21) which covers the wound (3) in an air-tight manner and a suction pump (10) for producing a negative pressure on the wound (3), said suction pump communicating with the wound cover (21) via a vacuum line (8). The device further comprises at least one pressure sensor (18, 19, 20) for determining the negative pressure on the wound (3) and a controller unit (19) for controlling the negative pressure. In order to increase the accuracy of measurement of the measured negative pressure, the pressure sensor (18, 19, 20) is arranged in the region of the wound (3) inside or directly on the wound covering (21, 7) and is protected from the contact with liquid (6) by a flexible protective membrane (32, 39).

Description

Vacuum therapy device with pressure sensor

The present invention relates to a vacuum therapy device having an airtight a wound covering covering the wound, a

Suction pump which is connected via a vacuum tube to the wound covering to produce at the wound under pressure with at least one pressure sensor for determining the negative pressure to the wound, and with a control unit for controlling the negative pressure.

Such a vacuum therapy device is known from DE 10 2005 014 420 A1. In the known vacuum therapy device is configured as a strain gauge pressure sensor within the

The wound covering disposed. However, the strain gauges permitted only very rough, qualitative pressure measurements. Sensitive and accurate pressure sensors can not be used in the known apparatus because they are damaged by the contact with the wound fluid or at least provide reliable readings more.

To einregeln the desired negative pressure to the wound as accurately as possible and keep it constant, you need reliable and repeatable pressure measurements. With little effort, you can attach a pressure sensor in a control unit of the vacuum therapy system in the vicinity of the suction pump. However, this has the disadvantage that the location of the pressure measurement the distance being bridged by a vacuum hose is relatively far from the site of the wound. As long as the suction pump is working, air closes through the vacuum hose and it turns due to the flow resistance of the vacuum tube, a pressure gradient one. A pressure gradient is also produced by other

Device elements in the region between the pressure sensor and the wound, in particular a container for receiving wound exudate, an approximately existing filter or in the region of a wound dressing. Provided that the resistance is known and remains unchanged, could be from the present at the pressure sensor pressure on to the wound

Close prevailing vacuum. but since to change the flow resistance, especially by bending the vacuum hose or clogging by wound exudate, can not be reliably closed to the pressure at the wound site at a location remote from the wound pressure sensor. It has therefore also been proposed to turn off the suction pump for the period of measurement and the measurement be taken after the pressure equalization. in the suction way, particularly in the vacuum hose when no air flow is present, there is set a state of equilibrium, so that the negative pressure to the wound, and the measured by the pressure sensor sub-pressure being substantially equal. However, this method has the disadvantage that the pressure throughout the system steadily increases and approaches the atmospheric pressure, because there are usually air leaks.

In EP 0865304 it is proposed to provide a second hose between the wound and the accommodated in the device in the vicinity of the suction pressure sensor. This second tube is not used for suction, so that no air flow is formed in it and the existing air by pressure equalization in balance. This measured by the pressure sensor values ​​are much more accurate in the vicinity of the negative pressure at the wound site. However, this known device has the disadvantage that an additional relatively long tube is provided. This is not only technically complicated and costly, but the patient may be less comfortable as a single hose. Moreover, the risk of accidents is increased, for example due to verheddernde or kinked

Hoses. The object of the invention is to provide a vacuum therapy device of the type mentioned with regard to the measurement accuracy for the

to improve under pressure at the wound site.

The solution according to the invention therefore provides that the pressure sensor is in the field of wound positioned within or directly at the wound cover and protected by a flexible protective membrane prior to contact with liquid. Due to the small distance between the pressure sensor and wound increases the accuracy of the

Under pressure measurement, wherein the protective membrane is a deterioration of the measurement accuracy due to contact of the photosensitive

Sensor electronics with the wound fluid avoids.

Preferably, the protective membrane is made of a thin

Plastic film. Such a plastic film includes the pressure sensor from its environment fluid-tight, yet so soft that they air at changes in the negative pressure no resistance

opposes and thereby ensures that on the pressure sensor side of the plastic film, the same pressure prevails as in the outdoor use.

In an advantageous embodiment of the invention the pressure sensor is connected to a radio transmitter for transmitting measurement signals to the

Control unit provided. This measure allows the placement of the pressure sensor below the wound covering, without the

Measuring signals should be transmitted to the control unit by means of an electrical line. Thereby, the costs associated with an electric line drawbacks, particularly problems of the air-tight passage through the wound covering and the additional

avoided susceptibility in the range of wound cover and control unit. - A -

In a further development of the invention it is provided that the pressure sensor is provided with an RFID chip. Such an RFID chip can be activated by a transmission pulse from the control device itself and then sends a signal back to which the measured pressure values ​​are encoded. The light emitted from the chip signal is received from the control unit, whereby the printing data are transmitted. The RFID chip has the advantage that it does not require its own power supply.

When the pressure sensor inside or on a side facing the wound outside is disposed arranged between wound and wound covering dressing, the distance to the wound is so low that the measurement can be performed with high accuracy with advantage. Another advantage of this measure is that the pressure sensor can be incorporated during manufacture of the wound dressing, so no separate installation of the pressure sensor to the patient is required.

In a first preferred embodiment of the invention, the pressure sensor of the protective membrane is completely enclosed. This embodiment is recommended especially in combination with an RFID chip, which is small enough to be welded together with the pressure sensor in a tiny bag made of plastic film, the plastic film serves as a protective membrane.

In a second alternative embodiment of the invention the pressure sensor is arranged in a liquid-tight sensor housing which is closed with the protective membrane. such a

The sensor housing has the advantage that it is robust and can protect the pressure sensor to strong external pressure or impact marks. The protective membrane can also inside the

Sensor housing are in a protected place. In a development of the latter embodiment, it is proposed that the sensor housing at one to connect the

Vacuum hose particular hose adapter of the wound covering is arranged. The attachment to the hose adapter has the advantage that it can be performed in the production of the hose adapter already, so that the pressure sensor is installed without a further step together with the hose adapter on the patient's wound. The mounting of the pressure sensor can not be forgotten.

Moreover, the existing of a relatively rigid material suitable

Hose adapter especially good for fixedly attaching the pressure sensor. This embodiment is also well suited for pressure sensors which have to be connected by an electric line to the controller, as to the hose adapter leading to the control unit vacuum hose is already connected. Therefore, a parallel guidance of the vacuum hose and electrical cable offers itself.

The invention can be further improved in that the

the sensor housing is in one piece with the hose adapter. In particular, the hose adapter may consist of a plastic injection molded part. Therefore, in the manufacture of the tubing adapter, the sensor housing can be formed as a cavity in the hose adapter, without the need for a special manufacturing step therefor.

If the sensor housing by a protective membrane from

Pressure sensor separate, only one through-hole with the

having associated housing portion outside area, has the air through the through hole unhindered access to the protective membrane, the protective membrane in the interior of said housing portion

is largely protected from destruction by mechanical action from outside. In a further embodiment of the invention it is provided that a sensor tube is attached to the through-hole which protrudes into the wound bed or the inside, arranged between wound and wound covering dressing. This sensor tube has the task of any flow resistances between the wound bed and the

To avoid pressure sensor or to get around, so that the pressure sensor exactly the pressure is applied, which prevails even at the free end of the sensor tube. Here it does not matter if something wound fluid should enter the sensor tube, as in the sensor tube basically no air flow takes place. Even if something wound fluid in the

should be penetrated sensor hose, it can not at the

get pressure sensor itself, because it is prevented by the protective membrane that. On the other hand, the wound fluid transfers such as a hydraulic system to change the negative pressure, so that at the

Pressure sensor still always substantially the same negative pressure prevails as at the end of the sensor tube.

Embodiments of the invention are explained in detail below with reference to the drawing. The figures of the drawings show in

Specifically: Figure 1 is a schematic representation of an inventive

Vacuum therapy device with pressure sensor in the area of ​​the wound;

2 shows a hose adapter connected with

Vacuum hose in a perspective view; Figure 3 is an enlarged sectional view of the hose adapter with pressure sensors installed in a first

Design shape; Figure 4 is a view similar to Figure 3 but of another

Design shape;

Figure 5 is a cross-sectional schematic representation of a

Pressure sensor in a first embodiment; Figure 6 is a cross-sectional schematic representation of a

Pressure sensor in a second embodiment;

Figure 7 is a cross-sectional schematic representation of a

Pressure sensor in a third embodiment.

In Figure 1 you can see a portion of a tissue of a patient 1 on average. On the skin surface 2 of a wound 3 forms a recess which extends to the wound bed. 4 The recess in the wound 3 is filled with a wound pad 5 composed of foam, fleece or

may consist fabric material. In any case, the wound dressing is suitable 5 to exert mechanical pressure on the wound 3 and receive the light emerging from the wound exudate 3. 6 On the

Wound pad 5 is arranged a hose adapter 7 on which a

is mounted vacuum hose. 8 The vacuum hose 8 connects the hose adapter 7 with a container 7, in which the

Wound exudate is collected. 6 The container 9 is connected via a

Connecting line 12 is connected to a suction pump 10 which is driven by an electric motor. 11 A control unit 13 includes input means 14, in particular an input keyboard and

Display means 15, such as an LCD display to show the operating states. 13 further includes the control unit comprises a controller 16 for controlling the electric motor 11 of the suction pump 10 via a control line 17. For the measurement of the controlled negative pressure at the wound site, a pressure sensor 18, 19, 20 which, as shown in Figure 1 at different locations can be arranged in the area of ​​the wound. 3 For air-tight covering 3 of the wound a wound covering 21 is provided. Which is glued in its outer edge portion 22 air-tightly to the skin surface. 2 The wound cover 21 is provided at its center with an approximately circular hole through which the

Hose adapter 7 protrudes.

As best seen in Figure 2, the tubing adapter 7 of an upper part 23 and a bottom part 24 to which the upper part is engaged 23rd The upper part 23 of the vacuum hose 8 is attached. The lower part 24 has a disk-shaped central portion 25, 26 at equal angular intervals of 90 ° degrees from each other radially projecting from the starting four support portions to the outside. The support portions 26 of the hose adapter 7 rest on the wound dressing 5 and forcing them under the action of negative pressure to the wound bed 4. At the top of the central portion 25, the wound cover 21 air-tightly bonded. When the electric motor set in the suction pump 10 in passage 11, the suction pump first sucks via the connecting line 12, the air from the container 9 and through the vacuum hose 8 through the hose adapter 7 therethrough and from the space above the wound 3 and below the wound covering 21 out. A value for the negative pressure is measured by the pressure sensor 18, which is connected via a signal line 27 to the controller 16 of the control unit. 13 Alternatively, the pressure sensor 19 may be connected via signal line 27 to the controller sixteenth

In another embodiment, the pressure sensor 20 is connected to an RFID chip to a tiny unit and either the inside of the wound dressing 5 or on a side facing the wound 3 outside - Q - of the wound dressing 5 placed on the wound base. 4 The control unit 13 is equipped with an antenna 28, which radio signals 29

sending out. The radio signals 29 are of the RFID chip of the

Pressure sensor 20 received. thereupon, the pressure sensor 20 emits radio signals 30, which are encoded with the measured pressure. The radio signals 30 reach the antenna 28 of the control unit 13, and are decoded there, and forwarded to the controller sixteenth In this way, the controller 16 receives information on the measured at the site of the wound by the pressure sensor 20 and then controls the pressure

Electric motor 11 of the suction pump 10 to the actual pressure to a predetermined target pressure to approximate the measured. The target pressure may be preset, for example, via the input keyboard 14 or via a data storage means of a not shown microprocessor.

Information about the processes in the control unit 13, the user can see on the display 15th

As best seen in Figures 5 and 6, the pressure sensor 18 accommodated in a sensor housing 19, by a

Protective membrane 32 is divided into two housing sections 33, 34th The protective membrane 32 seals the provided with the actual pressure sensor 18, 19 from housing section 33 airtight. The other

Housing section 34 is connected via a through hole 32 with the outside in connection, so that the negative pressure in the outer region can be measured. The protective membrane 32 is designed so soft that the pressure prevailing in the casing portion 34 pressure on

Housing section 33 transmits, without them about their on

Sensor housing 31 hermetically secured edge portions transmits any forces on the sensor housing 31st

As best seen in Figure 3, the pressure sensor shown in Figure 5 in detail may be mounted either on the top part 18 or 23 on the lower part 24 of the hose adapter. 7 The hose adapter 7 is allocated in accordance with the invention, the wound cover 21 and is regarded here as part of the wound covering 21st

When mounting the pressure sensor 18 on the outside of the upper part 23 of the hose adapter, the upper part 24 is provided with a pressure channel 36 through which the negative pressure from the interior space over the wound 3 and under the wound cover 21 with the pressure sensor 18 in

Connection is. When mounting the pressure sensor 18 on the inside of a support portion 26 of the hose adapter 7 because no special pressure channel is required, the through-hole 35 communicates with the space below the wound covering 21st

Instead of fastening a separate sensor housing 31 to the tubing adapter, the hose adapter can itself a cast

have cavity in which the pressure sensor 18 and the protective membrane 30.

In Figures 4 and 6 is another embodiment of the

Pressure sensor 19 according to the invention shown, in which the

Through hole 35 of the sensor housing 31 with a

is provided sensor hose 37 which, as can be seen in Figure 1, projects into the interior of the wound between 3 and wound cover 21 arranged wound dressing. 5 Alternatively, the sensor tube 27 may also extend up to the base of the wound. 4 At its free end 38 is the

Sensor tube 37 open and communicates with the pressure prevailing at the open end 38 of vacuum. Since it is not pumped through the sensor tube 37, there also flows no fluid. Therefore, there is set a full coming pressure equalization between the pressure prevailing at the free end 38 and the negative pressure applied to the pressure sensor 19 under pressure, so that the sensor 19 can actually measure the vacuum at the free end 38 of the sensor tube 37th

For a wireless signal communication between the pressure sensor 20 and the control unit 13 is best illustrated in Figure 7

suitable embodiment of the pressure sensor 20th The pressure sensor 20 is connected to an RFID chip is welded there in a thin plastic film 39, it as a protective membrane 39 on all sides

liquid-tight and air-tight manner. The pressure sensor 20 may be arranged so readily in the interior of the wound dressing 5 or on the underside of the dressing 5 in the vicinity of the wound base 4 without the wound exudate 6 could reduce or destroy the pressure sensor in its function. Especially practical is the

Fact that no signal line for connection to the

Control unit 13 is required. Rather takes place

Signal transmission by radio using the antenna 28 of the control unit. 13

LIST OF REFERENCE NUMBERS

1 tissue

2 skin surface

3 wound

4 wound base

5 wound dressing

6 wound exudate

7 Hose Adapter

8 vacuum hose

9 container

10 suction pump

11 electric motor

12 connection line

13 control unit

14 input means

15 display means

16 regulator

17 control line

18 pressure sensor

19 pressure sensor

20 pressure sensor

21 wound covering

22 edge region

23 shell

24 bottom

25 Central Section

26 support section

27 signal line

28 antenna 29 radio signal

30 radio signal

31 sensor housing

32 protective membrane

33 housing section

34 housing portion

35 through opening

36 pressure channel

37 sensor hose

Free end 38

39 protective membrane / plastic film

Claims

1. Vacuum therapy device with a a wound (3) airtightly
covering the wound cover (21), a suction pump (10), which communicates via a vacuum hose (8) with the wound cover (21) to produce at the wound (3) vacuum, with at least one pressure sensor (18, 19, 20 ) for determining the negative pressure to the wound (3) and with a control unit (13) for controlling the negative pressure, characterized in that the pressure sensor (19, 20) within the area of ​​the wound (3) or directly to the wound cover (21, 7) and by a
flexible protective membrane (32, 39) prior to contact with
Liquid (6) is protected.
2. Vacuum treatment apparatus according to claim 1, characterized
in that the protective membrane (32, 39) consists of a thin plastic film.
3. Vacuum treatment apparatus according to claim 1 or 2, characterized
in that the pressure sensor 20 is provided with a radio transmitter for transmitting measurement signals to the control unit.
4. Vacuum treatment apparatus according to claim 3, characterized
in that the pressure sensor (20) is provided with a RFID chip.
5. Vacuum therapy device according to one of the preceding
Claims, characterized in that the pressure sensor (20) inside or on a wound (3) facing outside of a wound between (3) and wound cover arranged (21) wound pad (5) is arranged.
6. Vacuum therapy device according to one of the preceding
Claims, characterized in that the pressure sensor (20) of the protective membrane (39) is completely enclosed.
7. Vacuum treatment apparatus according to any one of claims 1 to 5,
characterized in that the pressure sensor (18, 19) is arranged in a liquid-tight sensor housing (31) which is sealed with the protective membrane (32).
8. Vacuum treatment apparatus according to claim 7, characterized
in that the sensor housing (31) at one for connecting the vacuum hose (8) given hose adapter
(7) of said wound cover (21).
9. Vacuum treatment apparatus according to claim 8, characterized
in that the sensor housing is integrally formed with the hose adapter (7).
10. Vacuum treatment apparatus according to any one of claims 7 to 9,
characterized in that the sensor housing (31) by a protective membrane (32) from the pressure sensor (18, 19)
separate, only one through-hole (35) with the
having exterior associated housing section (34).
11. Vacuum treatment apparatus according to claim 10, characterized
in that one of the passage opening (35)
Sensor hose (37) is mounted, which is arranged into the wound bed (4) or in the interior of a wound between (3) and wound covering (21) wound pad (5) protrudes.
PCT/EP2010/005222 2009-08-29 2010-08-25 Vacuum therapy device comprising a pressure sensor WO2011023384A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102009039336A DE102009039336A1 (en) 2009-08-29 2009-08-29 Vacuum therapy device with pressure sensor
DE102009039336.6 2009-08-29

Publications (1)

Publication Number Publication Date
WO2011023384A1 true WO2011023384A1 (en) 2011-03-03

Family

ID=43048966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/005222 WO2011023384A1 (en) 2009-08-29 2010-08-25 Vacuum therapy device comprising a pressure sensor

Country Status (2)

Country Link
DE (1) DE102009039336A1 (en)
WO (1) WO2011023384A1 (en)

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US9950100B2 (en) 2004-04-28 2018-04-24 Smith & Nephew Plc Negative pressure wound therapy dressing system
US9962295B2 (en) 2012-07-16 2018-05-08 Smith & Nephew, Inc. Negative pressure wound closure device
US10117782B2 (en) 2012-05-24 2018-11-06 Smith & Nephew, Inc. Devices and methods for treating and closing wounds with negative pressure
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