WO2012065308A1 - Negative pressure wound therapy system capable of detecting wound exudate viscosity - Google Patents

Abstract

A negative pressure wound therapy system capable of detecting wound exudate viscosity comprises: a collection bottle (5) for collecting wound exudate; a negative pressure wound therapy device (8) consisting of a negative pressure source (6) and a controller (7); a wound kit for filling and enclosing the wound, which communicates with the collection bottle (5) via a connection tube (4); a sampling chamber for sampling wound exudate in the collection bottle (5); and a detecting and processing apparatus for detecting the viscosity of wound exudate in the sampling chamber. A negative pressure wound therapy system capable of detecting wound exudate viscosity comprises: a collection bottle (5) for collecting wound exudate; a negative pressure wound therapy device (8) consisting of a negative pressure source (6) and a controller (7); a wound kit for filling and enclosing the wound, which communicates with the collection bottle (5) via a connection tube (4); and a wound exudate viscosity detecting apparatus (14) for detecting the viscosity of wound exudate in the collection bottle (5).

Description

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of negative pressure wound treatment equipment, and more particularly to a negative pressure wound treatment system capable of detecting the viscosity of a wound exudate. BACKGROUND OF THE INVENTION Negative pressure wound treatment equipment, called Negative_Pressure_Wound_Therapy_De vices, is called NPWT, and its principle is to promote wound healing by applying a negative pressure to the wound. According to the clinical results of the United States in the past 10 years, the device has a good healing effect on various acute and chronic wound treatments.

 Generally, a negative pressure wound treatment system includes a negative pressure wound treatment device, a wound site kit, and a container for collecting exudate at the wound (herein referred to as a container for the collection bottle). Among them, the wound kit is used to close the wound and create a negative pressure space. Negative pressure wound therapy equipment is used to create the required wound negative pressure, consisting of a negative pressure source, and a controller. Referring to Figure 1, a common negative pressure wound treatment system is shown. The inside of the dotted line is the negative pressure wound treatment device 8; the reference numeral 1 is the skin tissue around the human wound; the filler 2 at the wound covers the wound of the human body; the wound closure 3 is placed above the filling 2 at the wound, and the wound is closed The wound filler 2 is connected to the liquid collecting bottle 5 through the connecting tube 4, thereby guiding the exudate from the wound into the liquid collecting bottle 5, and collecting the exudate from the wound through the collecting bottle 5, and collecting the liquid collecting bottle The other end of 5 is connected to the negative pressure source 6, and the negative pressure source 6 provides a negative pressure to supply the wound exudate to the liquid collecting bottle 5; the negative pressure source 6 is connected to a controller 7, which is negatively controlled by the controller 7. The pressure source 6 achieves control.

Wound exudate is a body fluid that accumulates in the wound and has many physiological causes for its formation. In wound treatment, exudate viscosity is one of the important topics in modern wound care research. Modern wound care for wound exudate research, as an important indicator of wound treatment, wound exudate viscosity is closely related to many diseases, measuring the viscosity of wound exudate to clarify the pathogenesis of these diseases and It is important to have timely diagnosis and treatment. However, in the prior art, there is no specific method for measuring the viscosity of the wound exudate, and the viscosity is thin and thick. The empirical judgment of life, subjective, or some rough calculation method, will limit the accuracy of the viscosity measurement, which will affect the medical staff's wrong judgment of the wound and the wrong treatment. For home care or medical staff who are not around for a long time, there is a wound healing phenomenon such as wound infection or bleeding. The patient is generally unable to recognize and cannot make timely and correct wound treatment, resulting in some accidents. On November 13, 2009, the US Food and Drug Administration (FDA) reminded the public of complications associated with NPWT, especially bleeding and infection. In the past two years, the FDA has received 6 death reports and 77 injury reports related to the use of NPWT, including 6 death cases, 17 injury cases with bleeding symptoms, and 27 cases with serious infections. All necessary studies A negative pressure wound treatment system capable of measuring the viscosity of wound exudate more accurately.

 Summary of the invention

 SUMMARY OF THE INVENTION A first object of the present invention is to provide a negative pressure wound treatment system which can detect the viscosity of a wound exudate, which can detect the viscosity of the wound exudate and provide more accurate data for the medical staff to judge the condition. A second object of the present invention is to provide another negative pressure wound treatment system capable of detecting the viscosity of wound exudate, capable of detecting the viscosity of the wound exudate in the liquid collection bottle, for the wound of the medical staff The observation and research work of the exudate is convenient.

 To achieve the above first object, a negative oral treatment system for detecting the viscosity of a wound exudate of the present invention comprises:

 The flow rate and pressure difference of the liquid, and calculate the viscosity of the wound exudate.

 Preferably, the detecting and processing device comprises:

 An injection control device controls the height of the wound exudate entering the sampling chamber;

a volume monitoring device for monitoring the liquid level of the wound exudate in the sampling chamber; a pressure detecting device for detecting a pressure difference of a liquid surface in the sampling chamber;

 The arithmetic unit calculates the height difference of the wound exudate, the pressure difference, and the length of time during which the liquid level changes, and calculates the viscosity of the wound exudate.

 Preferably, the sampling chamber is a cavity formed on the inner side wall of the liquid collecting bottle, is electrically connected to the inner portion of the liquid collecting bottle, and is electrically connected to the negative pressure source through a pipeline.

 Preferably, the sampling chamber is a lumen of a sampling tube disposed in the liquid collection bottle.

 Preferably, the detecting and processing device further comprises: a thermostatic control device that keeps the temperature of the exudate in the liquid collecting bottle unchanged.

 Preferably, the radius of the sampling chamber is less than a quarter of the radius of the liquid collection bottle.

 Preferably, the injection control device comprises two electromagnetic valves, one of which is disposed in a connecting line between the liquid collecting bottle and the negative pressure source, controls the negative pressure in the liquid collecting bottle, and the other is disposed in the sampling chamber and the negative pressure In the connection line of the source, the negative pressure in the sampling chamber is controlled.

 Preferably, a storage device is further included, which is disposed in the MCU and stores the value of the detected viscosity at a certain time interval.

 Preferably, the storage device includes a USB slot and/or an SD card slot, and stores the value of the consistency into an external storage device inserted into the USB slot and/or the SD card slot.

 Preferably, the arithmetic unit further calculates an average value of the viscosity according to the viscosity value in a certain period of time.

 The negative pressure wound treatment system capable of detecting the viscosity of wound exudate of the present invention, because a sampling chamber is provided, the wound exudate in the liquid collecting bottle is collected, and a detecting processing device is arranged to detect the wound exudation in the sampling chamber The viscosity of the liquid is used to detect the viscosity of the wound exudate. Therefore, the medical staff can eliminate the viscous data based on the empirical data and quantify the calculated value of the viscosity for the medical staff. Wound treatment is convenient.

In order to achieve the above second object, the negative pressure wound treatment system of the present invention for detecting the viscosity of wound exudate comprises: The wound exudate viscosity detecting device detects the viscosity of the wound exudate in the liquid collecting bottle. Preferably, the method further comprises:

 The data acquisition and processing device collects and processes the wound exudate viscosity detecting device to detect the obtained data, and stores the processed value.

 Preferably, the wound exudate viscosity detecting device comprises a capillary viscometer for detecting the viscosity of the wound exudate in the collecting bottle.

 Preferably, the capillary viscometer comprises:

 a pressure detecting module that detects a pressure difference between the upper and lower ends of the capillary;

 A flow monitoring module that controls and monitors the flow of wound exudate through the capillary.

 Preferably, the capillary viscometer further comprises an arithmetic unit for calculating the viscosity of the wound exudate based on the pressure difference between the upper and lower ends of the capillary and the flow rate of the wound exudate flowing through the capillary.

 Preferably, the wound exudate viscosity detecting device comprises a rotational viscometer.

 Preferably, the rotational viscometer comprises:

 a shear stress detecting module for detecting a shear stress of the wound exudate in the liquid collecting bottle;

 The shear rate detecting module detects the shear rate of the wound exudate in the liquid collecting bottle.

 Preferably, the rotational viscometer further comprises a data processing unit for calculating the viscosity of the wound exudate according to the shear stress and the shear rate of the wound exudate in the liquid collection bottle.

 Preferably, the wound exudate viscosity detecting device comprises an Ubbelohde viscometer or an Enshi viscometer.

 The negative pressure wound treatment system capable of detecting the viscosity of the wound exudate of the present invention can detect the viscosity of the wound exudate by setting the wound exudate viscosity detecting device, and the medical staff can eliminate the empirical value. The fuzzy data is used to judge the viscosity of the wound exudate, and the calculated value of the viscosity is quantified, so that the medical staff can more accurately understand the viscosity of the wound exudate, and provide convenience for the medical staff to study the wound. For cases where the viscosity becomes larger and the wound condition deteriorates, the medical staff can handle it in time to prevent delays.

 Further, a data acquisition and processing device is further included, which collects and processes the data obtained by the wound exudate viscosity detecting device, and then stores the processed value, thereby facilitating the medical personnel to view the data in the future.

The invention provides two negative pressure wound treatment systems for detecting the viscosity of wound exudate Having the same inventive concept, meeting the requirements of unity, can be proposed in one application.

DRAWINGS

 1 is a schematic structural view of a conventional negative pressure wound treatment system;

 2 is a schematic view showing the principle of detecting the viscosity of the exudate of the negative pressure wound treatment system capable of detecting the viscosity of the wound exudate provided by the present invention;

 Figure 3 is a graph showing the relationship between shear force and shear rate;

 Figure 4 is a schematic view showing the structure of a negative pressure wound treatment system for detecting the viscosity of wound exudate provided by the present invention;

 Figure 5 is a schematic view showing the structure of the liquid collecting bottle in Figure 4;

 Figure 6 is a schematic view showing the structure of a second embodiment of a negative pressure wound treatment system for detecting the viscosity of wound exudate provided by the present invention;

 Figure 7 is a schematic view showing the principle of detecting the viscosity of the capillary viscometer in the second embodiment; in the figure, the relevant reference numerals are as follows:

 1 wound, 2 - wound filler, 3_ wound closure,

 4 a connecting tube, 5 - liquid collecting bottle, 51 - collecting bottle side wall,

 52—the inner area of the liquid collection bottle, 6—negative pressure source, 7—controller,

 8_ negative pressure wound treatment equipment, 9-capillary, 10-sampling tube,

 11 a test tube, 12 - constant temperature water bath, 13 - solenoid valve,

 131—the solenoid valve that connects the liquid collection bottle, 132—the solenoid valve that connects the sampling tube.

 14 a wound exudate viscosity detection device, 15 - data acquisition and processing device. DETAILED DESCRIPTION OF THE INVENTION The principles utilized by the present invention are as follows:

 Since the wound exudate belongs to a non-Newtonian fluid, the gradient of shear stress and shear rate varies with the shear rate. There is no constant viscosity value, so the measurement of the viscosity of the wound exudate is actually measuring the wound exudate. The static viscosity as a function of shear rate.

As shown in Fig. 2, there is a pressure difference across the capillary 9, and the flow rate of the wound exudate flowing through the capillary 9 per unit time is: 3

 R where β is the flow per unit time, R is the inner radius of the capillary 9, is the shear rate, τ is the shear stress of the wound exudate somewhere in the capillary, ^ is the wound exudate at the inner wall of the capillary 9 Shear stress, and where is the pressure difference across the capillary 9, L is capillary

 2R

Tube 9 length.

Theory and practice prove that the relationship between shear rate and shear stress satisfies the power law model, namely: γ(τ) = ατ ^1/η . Solve the above two formulas to get:

 = ,

 3n + l R

Therefore, the shear rate at the inner wall of the capillary 9 is:

Therefore, in the actual measurement, by sampling the pressure of the wound exudate in the sampling tube 10, the pressure difference and the flow rate _β between the two samples are calculated, and the minimum is adopted according to the mechanical parameters L, R of the capillary 9. The two-multiplication method performs curve fitting, and the values of a and n are obtained, and the curve of the static viscosity of the exudate as a function of the shear rate is obtained, and the viscosity of the wound exudate can be obtained from the curve.

 In addition, the size of the viscosity is directly related to the temperature. The higher the temperature, the smaller the viscosity, the lower the temperature, the greater the viscosity, so the temperature change is also an important factor affecting the viscosity. In the constant temperature water bath 12, the temperature in the test tube was kept constant, and the influence of temperature on the viscosity of the exudate was ignored.

 Here, by controlling the opening and closing of the solenoid valve 13, a certain amount of wound exudate is withdrawn into the sampling tube 10.

 See Fig. 3, Fig. 3 is a graph showing the relationship between shear stress and shear rate. It can be seen from this that: The cut should be weakened: The viscosity decreases as the shear rate increases.

 Newtonian fluid: viscosity does not change with shear rate, is a constant

 Cut to strengthen the song: Viscosity increases as the shear rate increases.

For wound exudates belonging to non-Newtonian fluids, the calculated viscosity value is an indefinite value. The wound exudate at the center of the sampling tube has the highest rate of cut and the viscosity is the smallest, while the wound exudate at the inner wall of the sampling tube has the lowest rate of cut and the viscosity is the largest, so the viscosity of the wound exudate The consistency can be obtained by calculating the value of the viscosity and taking the average value of the viscosity at a certain time interval as a measure of the viscosity.

 Based on the above principles and calculation formulas, the negative pressure wound treatment system capable of detecting the viscosity of the exudate of the present invention will be described in detail by way of specific examples with reference to the accompanying drawings.

 Embodiment 1

 Referring to FIG. 4 and FIG. 5, FIG. 4 is a schematic structural view of a first embodiment of a negative pressure wound treatment system for detecting the viscosity of a wound exudate provided by the present invention; FIG. 5 is a schematic structural view of the liquid collection bottle of FIG. . The negative pressure wound treatment system of the present invention for detecting the viscosity of exudate includes:

 a liquid collection bottle 5, for collecting wound exudate;

 The negative pressure wound treatment device 8 is composed of a negative pressure source 6 and a controller 7;

 a wound kit for filling and sealing the wound 1 , comprising a wound filler 2 - a wound dressing, a wound closure 3 - a film, the wound filler 2 being connected to the collecting bottle 5 through a connecting tube 4; a negative pressure source and a collecting bottle 5 Through the pipeline connection, the liquid collection bottle 5 is provided with a negative pressure, so that the wound exudate exuded from the wound filler flows into the liquid collecting bottle;

 a sampling tube 10 having a sampling chamber is disposed adjacent to the inner side wall of the liquid collecting bottle, is electrically connected to the inside of the liquid collecting bottle, and is electrically connected to the negative pressure source through the pipeline;

 The injection control device controls the height of the wound exudate entering the sampling chamber, and includes a solenoid valve 131 disposed in the connecting line of the liquid collecting bottle 5 and the negative pressure source 6, and a sampling valve 10 and a negative pressure source 6 Connecting the solenoid valve 132 in the pipeline;

 a volume monitoring device for monitoring the liquid level of the wound exudate in the sampling chamber;

 a pressure detecting device for detecting a pressure difference of a liquid surface in the sampling chamber;

 The height difference of the wound exudate, the pressure difference, and the length of time over which the liquid level changes are calculated, and the viscosity of the wound exudate is calculated.

 Referring to Fig. 5, the solenoid valve 131 and the solenoid valve 132 are normally open, and the opening of the solenoid valve 131 and the solenoid valve 132 is controlled by the control unit of the injection control device, and the suction into the liquid collecting bottle 5 and the sampling tube 10 is controlled. The amount of exudate.

Wherein, the radius R of the sampling tube 10 is known and is much smaller than the radius of the liquid collecting bottle, this embodiment In the example, the radius is less than a quarter of the radius of the collection bottle.

The working process of the embodiment is as follows: a height value h is set during the sampling process, and the volume monitoring device monitors in real time, when the height difference between the liquid surface of the wound exudate and the liquid level of the liquid collecting bottle extracted in the sampling tube is h, The solenoid valve is adjusted to maintain the liquid level in the sampling tube unchanged, thereby maintaining the height difference h, and the pressure detecting device detects the pressure difference ΔΡ of the liquid surface of the wound in the sampling tube, and adjusts the diameters of the two solenoid valves to Consistently, the volume monitoring device monitors the liquid level change of the wound exudate in the sampling tube. When the liquid level of the wound exudate in the sampling tube is at the same level as the level of the wound exudate in the liquid collecting bottle, the recording liquid level drops. The length of time Δ, then, the arithmetic unit finds the injury by the formula _β = ^ according to the radius R of the sampling tube, the height difference h, and the length of time data.

 The flow rate of the At mouth exudate flowing through the sampling tube is calculated by the least square method according to the pressure difference and the flow data, and the values of a and n are obtained, and the static viscosity of the wound exudate is obtained according to the shear rate. The curve of the change, the slope of the curve is calculated, which is the viscosity of the wound exudate.

 In addition, since the temperature change also affects the viscosity of the wound exudate, in order to make the measurement process more simple, a temperature control device is set up - a constant temperature water bath (not shown in Fig. 5), and the liquid collection bottle 5 is placed. In this constant temperature water bath, the temperature of the wound exudate in the liquid collection bottle is kept constant, so that the temperature difference is negligible.

 The embodiment further includes a storage device that calculates an average value of the viscosity at a certain time interval and stores it in the MCU. The storage unit is also provided with a USB slot and an SD card slot, and can be inserted into an external storage device, so that the data can be taken out for analysis. The viscosity data stored in the MCU can be processed by the program, the viscosity is displayed on the display interface, or the data of the viscosity is taken out, and the medical staff is used for the viscosity analysis to determine the wound treatment. Case.

 By using the negative pressure wound treatment system of the present invention for detecting the viscosity of the exudate, the medical staff can obtain the viscosity data of the wound exudate more accurately, which is convenient for the medical staff to deteriorate the wound and cause the viscosity value of the infection. Increased abnormalities are dealt with in a timely manner to reduce unnecessary medical incidents.

 As a further embodiment, the sampling chamber can also be formed directly on the liquid collecting bottle, that is, a sampling chamber is integrally formed on the inner side wall of the liquid collecting bottle.

Embodiment 2 Referring to FIG. 6 and FIG. 7, the negative pressure wound treatment system for detecting the viscosity of the wound exudate in the embodiment includes:

 Liquid collection bottle 5, ^: set wound exudate;

 The negative pressure wound treatment device 8 is composed of a negative pressure source 6 and a controller 7. The liquid collection bottle 5 and the negative pressure source 6 are connected through a connecting tube 4, and the negative pressure source 6 supplies a negative pressure thereto, so that the wound exudate can Flow into the liquid collection bottle 5;

 a wound kit, filling the wound and closing the wound, communicating with the collection bottle 5 through the connecting tube 4, the wound kit comprising the wound filler 2 and the wound closure 3;

 The wound exudate viscosity detecting device 14 detects the viscosity of the wound exudate in the liquid collecting bottle 5, which includes a capillary viscometer, wherein the capillary viscometer includes: a pressure for detecting a pressure difference between the upper and lower ends of the capillary a detection module, a flow monitoring module for controlling and monitoring the wound exudate flowing through the capillary, and calculating a viscosity of the wound exudate based on a pressure difference between the upper and lower ends of the capillary and a flow rate of the wound exudate flowing through the capillary Degree of operation unit;

 The data collection and processing device 15 collects and processes the viscosity data obtained by detecting the wound exudate viscosity detecting device, and obtains an average value of the viscosity as the actual viscosity, and stores the actual viscosity after the treatment. Value.

 Embodiment 3

 The difference between this embodiment and the second embodiment is that the wound exudate viscosity detecting device comprises a rotational viscometer which replaces the capillary viscometer in the first embodiment.

 The rotary chamber of the rotary viscometer is electrically connected to the liquid collecting bottle and is electrically connected to the negative pressure source. The control valve is arranged in the connecting line with the negative pressure source, so that the wound exudate in the liquid collecting bottle can flow into the rotating chamber. Then, the viscometer was rotated to measure the viscosity of the wound exudate in the collection bottle.

 The rotational viscometer includes a shear stress detecting module for detecting a shear stress of a wound exudate, a shear rate detecting module for detecting a shear rate of the wound exudate, and a cut of the wound exudate according to the test A data processing unit that calculates the viscosity of the wound exudate by stress and shear rate calculations.

 The rest are the same as those in the second embodiment, and are not described here.

The above is only a preferred embodiment of the present invention. It should be noted that the above-described preferred embodiments are not to be construed as limiting the scope of the invention. The square is subject to accuracy. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

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Claims

 Rights request  1. A negative pressure wound treatment system capable of detecting the viscosity of wound exudate, comprising: a liquid collecting bottle, collecting wound exudate;  The negative pressure wound treatment device is composed of a negative pressure source and a controller;  a wound kit that fills and closes the wound and is connected to the collection via a connecting tube;  It is characterized in that it further comprises:  Sampling chamber, collecting wound exudate in the liquid collecting bottle;  The detection processing device detects the viscosity of the wound exudate in the sampling chamber.  2. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 1, wherein the detection processing device detects the flow rate of the wound exudate in the sampling chamber after a length of time and The pressure is poor and the viscosity of the wound exudate is calculated.  3. The negative pressure wound treatment system of claim 1, wherein the detection processing device comprises:  An injection control device controls the height of the wound exudate entering the sampling chamber;  a volume monitoring device for monitoring the liquid level of the wound exudate in the sampling chamber;  a pressure detecting device for detecting a pressure difference of a liquid surface in the sampling chamber;  The arithmetic unit calculates the height difference of the wound exudate, the pressure difference, and the length of time during which the liquid level changes, and calculates the viscosity of the wound exudate.  4. The negative pressure wound treatment system for detecting the viscosity of wound exudate according to claim 1, wherein the sampling chamber is a cavity opened on the inner side wall of the liquid collecting bottle, and the liquid collecting bottle The internal conduction is conducted and is conducted through the pipeline to the negative pressure source.  5. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 1, wherein the sampling chamber is a lumen of a sampling tube disposed in the liquid collection bottle.  6. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 1, wherein the detection processing device further comprises: a thermostatic control device for maintaining a wound exudate in the liquid collection bottle The temperature does not change.  7. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 1, wherein the sampling chamber has a radius smaller than a quarter of a radius of the collecting bottle. 8. The negative pressure wound treatment system for detecting the viscosity of wound exudate according to claim 3. The injection control device comprises two electromagnetic valves, one of which is disposed in a connecting pipe of the liquid collecting bottle and the negative pressure source, controls the negative pressure in the liquid collecting bottle, and the other is disposed in the sampling cavity. In the connection line with the negative pressure source, the negative pressure in the sampling chamber is controlled.  9. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 1, further comprising a storage device disposed in the MCU to store the detected viscosity at a certain time interval. The value of the degree.  10. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 9, wherein said storage device comprises a USB slot and/or an SD card slot, which is viscous The value is stored in an external storage device inserted in the USB slot and/or SD card slot.  11. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 3, wherein the arithmetic unit further calculates an average viscosity according to a viscosity value within a certain period of time. value. A negative pressure wound treatment system capable of detecting the viscosity of a wound exudate, comprising:

 a wound kit that fills and closes the wound and is connected to the collection via a connecting tube;  It is characterized in that it further comprises:  The wound exudate viscosity detecting device detects the viscosity of the wound exudate in the liquid collecting bottle. 13. The negative pressure wound treatment system of claim 12, wherein the method further comprises:  The data acquisition and processing device collects and processes the wound exudate viscosity detecting device to detect the obtained data, and stores the processed value.  14. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 12, wherein the wound exudate viscosity detecting device comprises a capillary viscometer for detecting a liquid collection bottle. The consistency of the wound exudate.  15. The negative pressure wound treatment system of claim 14, wherein the capillary viscometer comprises:  a pressure detecting module that detects a pressure difference between the upper and lower ends of the capillary; A flow monitoring module that controls and monitors the flow of wound exudate through the capillary. 16. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 15, wherein the capillary viscometer further comprises an arithmetic unit, according to a pressure difference between the upper and lower ends of the capillary and flowing through the capillary The flow rate of the wound exudate calculates the viscosity of the wound exudate.  17. A negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 12, wherein said wound exudate viscosity detecting means comprises a rotational viscometer. 18. The negative pressure wound treatment system of claim 17, wherein the rotational viscometer comprises:

 19. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 18, wherein said rotational viscometer further comprises a data processing unit, according to a wound exudate in the collection bottle The shear stress and shear rate calculate the viscosity of the wound exudate.  20. The negative pressure wound treatment system for detecting the viscosity of a wound exudate according to claim 12, wherein said wound exudate viscosity detecting means comprises an Ubbelohde viscometer or an Enshi viscometer . +