WO2012009869A1

WO2012009869A1 - Negative pressure wound treatment system capable of detecting volume of liquid in liquid collection bottle

Info

Publication number: WO2012009869A1
Application number: PCT/CN2010/075690
Authority: WO
Inventors: 菅冀祁; 隗刚; 黄锦旺; 李佳
Original assignee: 惠州市华阳多媒体电子有限公司
Priority date: 2010-07-23
Filing date: 2010-08-04
Publication date: 2012-01-26
Also published as: CN101884575A

Abstract

A negative pressure wound treatment system capable of detecting volume of liquid in a liquid collection bottle includes: the liquid collection bottle (5) for collecting exudates of a wound; a negative pressure wound treatment device (8) composed of a negative pressure source (6) and a controller (7); a wound suite for filling the wound and sealing the wound connected to the liquid collection bottle (5) by a conduit (4); at least a detection module (9) including an emission unit (91) for emitting an electromagnetic wave or an ultrasonic signal to the liquid collection bottle (5), a receiving unit (92) utilized for receiving the electromagnetic wave or the ultrasonic signal reflected or refracted by the liquid collection bottle (5), and a detection control unit for judging whether there are exudates of a wound at the location of the detection module (9) based on whether the receiving unit (92) has received the electromagnetic wave or the ultrasonic signal.

Description

Negative pressure wound treatment system capable of detecting the amount of liquid in the liquid collection bottle

This application claims priority to Chinese Patent Application No. 201010237061.1, entitled "Negative Pressure Wound Treatment System for Liquid Volume in Detectable Liquid Bottles", filed on July 23, 2010, the entire contents of which are filed on July 23, 2010. This is incorporated herein by reference. Technical field

The invention relates to the technical field of negative pressure wound treatment equipment, in particular to a negative pressure wound treatment system capable of detecting the amount of liquid in a liquid collection bottle. Background technique

Negative pressure wound therapy equipment, called "Negative Pressure-Wound- Therapy-Devices", referred to as NPWT, is based on the principle of applying negative pressure to the wound to promote wound healing. Combined with other equipment to form negative pressure wound therapy. system. According to clinical data from the United States in the past 10 years, the negative pressure wound treatment system 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 (this container is referred to as a collection bottle in this document). Among them, the wound site kit is used to close the wound and form a corresponding negative pressure space. Negative pressure wound therapy devices are used to create the required negative pressure in the negative pressure space. The negative pressure wound treatment device consists 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; 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 to form a negative Pressing space; the wound filling 2 is connected to the liquid collecting bottle 5 through the drainage tube 4, and the other end of the liquid collecting bottle 5 is connected with the negative pressure source 6; the negative pressure source 6 provides a negative pressure for the wound exudate to flow to the set The liquid bottle 5 provides power to guide the exudate from the wound to the liquid collection bottle 5, and the liquid collection bottle 5 collects the exudate from the wound; the negative pressure source 6 is connected to a controller 7 and is held by the controller 7 The pressure source 6 achieves control. The negative pressure wound treatment system usually has a feature that the liquid collection bottle is designed according to the equipped negative pressure wound treatment device, and the liquid collection bottle can be designed into various shapes, such as a long strip shape, and is closely attached to the negative pressure wound. Treatment equipment. In the use of the negative pressure wound treatment system, it is required that when the wound exudate collected by the liquid collecting bottle is full, the exudate should not be reversed into the negative pressure wound treatment device, and the liquid collecting bottle needs to be replaced in time; in order to meet this requirement, Generally observed directly by medical staff or patients The way to determine if the collection bottle is full of liquid makes the use of the negative pressure wound treatment system very inconvenient. Summary of the invention

It is an object of the present invention to provide a negative pressure wound treatment system that can detect the amount of liquid in a liquid collection bottle to detect the amount of liquid in the liquid collection bottle, thereby facilitating the use of medical personnel and patients.

In order to solve the above technical problem, the negative pressure wound treatment system of the liquid amount in the detectable liquid collection bottle of the present invention comprises: a negative pressure wound treatment device, including a negative pressure source and a controller;

a wound kit that fills the wound and closes the wound, and is connected to the collection bottle through a pipe;

The method further includes at least one detecting module, where the detecting module includes:

a transmitting unit that emits an electromagnetic wave or an acoustic wave signal to the liquid collecting bottle;

a receiving unit that receives an electromagnetic wave or sound wave signal reflected or refracted by the liquid collecting bottle;

The detection control unit determines whether there is a wound exudate at the position of the detection module according to whether the receiving unit receives an electromagnetic wave or an acoustic wave signal.

Optionally, when the receiving unit does not receive the electromagnetic wave or the acoustic wave signal, it is determined that there is a wound exudate at the position of the detecting module; or, when the receiving unit receives the electromagnetic wave or the acoustic wave signal, it is determined that the detecting module has a wound seepage at the position of the detecting module. Drain.

Preferably, the electromagnetic wave is any one of infrared rays, visible light, and ultraviolet rays.

Preferably, the electromagnetic wave is a laser. The laser can be used to ensure directionality and not to diverge.

Preferably, the liquid collection bottle is provided with a plurality of gear positions for characterizing the level of the wound exudate, each gear position corresponding to a detection module.

Preferably, the alarm device further includes an alarm device, and when the detecting control unit of the detecting module corresponding to the gear position characterizing the highest liquid level height determines that the gear position has wound exudate, an alarm trigger signal is sent to the alarm device, and the alarm device sends out Warning signal.

Preferably, the detection control unit controls the intensity of electromagnetic waves or sound waves emitted by the transmitting unit. Preferably, the detection control unit controls an encoding rule of electromagnetic waves or sound waves emitted by the transmitting unit, and determines whether the receiving code is valid according to the encoding rule, and further controls whether the receiving unit receives or not. Preferably, 2 to 10 of the detection modules are included.

Preferably, a display unit is further included, the display unit being coupled to the detection control unit and displaying a gear indicating a level of a wound exudate level in the liquid collection bottle.

Preferably, the detecting module is disposed on a transmission mechanism, and the transmission mechanism is coupled to a driving mechanism.

Preferably, the transmission mechanism is any one of a screw rod, a gear set, a belt, and a leather wheel.

The negative pressure wound treatment system for detecting the liquid amount of the liquid bottle of the present invention, since at least one detecting module is disposed, the detecting module comprises: a transmitting unit that emits electromagnetic waves or ultrasonic signals to the liquid collecting bottle; and a receiving unit that receives the liquid collecting bottle The reflected or refracted electromagnetic wave or ultrasonic signal, the detection control unit determines whether the receiving unit receives the electromagnetic wave or the ultrasonic signal, and if not, determines that there is a wound exudate at the position of the detecting module, and therefore, the liquid collecting can be detected The liquid level of the wound exudate in the bottle enables the medical staff and the patient to know the amount of exudate in the liquid collecting bottle in time, so as to find out whether the collecting bottle is full or not, so as to prevent the exudate from flowing back to the negative pressure wound. It is easy to use in the treatment equipment. DRAWINGS

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

Figure 2 is a schematic view showing the structure of the first embodiment of the negative pressure wound treatment system for detecting the liquid amount of the liquid collection bottle of the present invention;

Figure 3 is a schematic view of the optical path of part A of Figure 2;

Figure 4 is a schematic diagram of the optical path when there is no exudate in a liquid collecting bottle in the first embodiment;

Figure 5 is a schematic diagram of the optical path when there is a transparent exudate at a certain place in the liquid collecting bottle in the first embodiment;

6 is a schematic diagram of an optical path when an opaque exudate is present at a certain place in the liquid collection bottle and the electromagnetic wave is visible light;

Figure 7 is a schematic view showing the structure of the second embodiment of the negative pressure wound treatment system for detecting the liquid amount of the liquid bottle of the present invention;

Figure 8 is a schematic view of the optical path of part B in Figure 6;

9 is a schematic view showing the cooperation of the detecting module, the transmission mechanism and the driving mechanism in the third embodiment of the negative pressure wound treatment system for detecting the liquid amount of the liquid collecting bottle of the present invention. detailed description The basic idea of the present invention is to set a corresponding electromagnetic wave or acoustic wave signal transmitting unit and receiving unit, and to cause the corresponding signal emitted by the transmitting unit to collect liquid in the liquid bottle, and then determine the liquid collecting according to the state of the receiving signal received by the receiving unit. The height of the liquid in the bottle to detect the amount of liquid in the collection bottle. Based on the existing negative pressure wound treatment system, the negative pressure wound treatment system provided by the present invention is provided with at least one detection module, and the detection module comprises a transmitting unit, a receiving unit and a detecting control unit, and the electromagnetic wave is emitted from the transmitting unit to the liquid collecting bottle or The ultrasonic signal, the receiving unit receives the electromagnetic wave reflected or refracted by the liquid collecting bottle, and the detecting control unit determines whether there is a wound exudate at the position of the detecting module according to whether the receiving unit receives the electromagnetic wave or the ultrasonic signal.

Hereinafter, the negative pressure wound treatment system of the liquid amount of the detectable liquid bottle of the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

Embodiment 1

Referring to Figures 2 and 3, Figure 2 is a negative pressure wound treatment system for the amount of liquid in the detectable liquid collection bottle in the present embodiment, and Figure 3 is a schematic view of the optical path at A in Figure 2.

The negative pressure wound treatment system of the first embodiment includes:

a liquid collection bottle 5 for collecting wound exudate;

Negative pressure wound treatment device 8 , comprising a negative pressure source 6 and a controller 7;

a wound kit for filling a wound and closing the wound, including a wound filler 2, a wound closure 3, and a wound filler 2 connected to the collection bottle 5 through a conduit 4;

On the side wall of the liquid collecting bottle 5, four detecting modules 9 are further disposed, each detecting module 9 includes: a transmitting unit 91, which emits electromagnetic waves or ultrasonic signals to the liquid collecting bottle 5, and is disposed on one side of the liquid collecting bottle 5;

The receiving unit 92 receives the electromagnetic wave or ultrasonic signal refracted by the liquid collecting bottle 5, and is disposed on the other side of the liquid collecting bottle 5 opposite to the emitting unit 91 so as to have no oozing liquid at the position of the liquid collecting bottle 5, Just received an electromagnetic wave or ultrasonic signal that has been transmitted through the refraction.

The detection control unit determines whether the receiving unit receives an electromagnetic wave or an ultrasonic signal, and if not, determines that there is a wound exudate at the position of the detecting module.

The electromagnetic wave used in the present embodiment is infrared light. As another embodiment, visible light, ultraviolet light, laser light or other electromagnetic signals may be used, and ultrasonic waves, infrasound waves or other sound wave signals may be used. Wherein, according to actual needs, four or more gear positions for characterizing the level of the wound exudate can be set in the liquid collecting bottle 5, and each gear position corresponds to one detecting module 9, according to the detecting module 9 The receiving unit 92 receives the infrared signal or not, determines whether there is an exudate here, and finally determines the liquid level in the liquid collecting bottle 5 by the number of receiving units 92 that can receive the infrared signal.

Wherein, the negative pressure wound treatment system may further include an alarm device (not shown), and the detection control unit of the detection module 9 corresponding to the gear position characterizing the highest liquid level height receives the electromagnetic wave or the ultrasonic signal according to the receiving unit 92. Judging, if not, judging that there is liquid in the gear position, the wound exudate in the liquid collecting bottle 5 is full, and an alarm trigger signal is sent to the alarm, and the alarm sends an alarm signal to prompt the medical staff or The patient replaces the collection bottle in time.

Wherein, the detection control unit can also be used to control the intensity of the electromagnetic wave or ultrasonic wave emitted by the transmitting unit 91, so that the emitted electromagnetic wave or ultrasonic wave is strong enough to be distinguished from other interference light, so as to be received by the receiving unit, and the detection is improved. Sensitivity.

The detection control unit may also control the coding rule of the electromagnetic wave or the ultrasonic wave emitted by the transmitting unit 91, and determine whether the received code is valid according to the coding rule, and further control whether the receiving unit receives or not.

The number of the detecting modules 9 can be determined according to the specific requirements of the liquid collecting bottle 5, for example, 2, 3, 5, 6, 7, 8, 9, or 10.

The negative pressure wound treatment system may further include a display unit (not shown) connected to the detection control unit to display a position in the liquid collection bottle 5 that characterizes the level of the wound exudate liquid, which is convenient for the medical staff. And patient use.

The operation of the detecting module 9 in the present invention will be described below.

Referring to FIG. 3, the emitting unit 91 emits an infrared ray S1, which is oscillated through the side wall 51 of the liquid collecting bottle 5 into the inner region 52 of the liquid collecting bottle 5, and then ejected from the other side of the side wall 51 of the liquid collecting bottle 5, The receiving unit 92 receives the infrared ray S1 that penetrates and refracts, and the other part of the infrared ray is reflected into the reflected light S2.

Referring to Fig. 4, Fig. 4 is a schematic view of the optical path when there is no exudate at the corresponding position in the liquid collecting bottle. Next, the infrared light path when there is no exudate at the liquid collecting bottle 5 between the transmitting unit 91 and the receiving unit 92 is made. further analysis:

Let α, β, γ, Θ be infrared rays incident on the outer surface of the outer casing of the liquid collecting bottle 5, and be injected into the liquid collecting bottle 5 The shell, the inner surface of the casing of the liquid collecting bottle 5, and the angle between the infrared rays and the normal line when injected into the inner cavity of the liquid collecting bottle 5. Let δ be the angle formed by the point at which the infrared rays are incident on the outer surface of the outer casing of the liquid collecting bottle 5 and the line connecting the points from the inner surface to the center line of the cross section of the liquid collecting bottle 5. Let the liquid bottle 5 have a radius R and a wall thickness h.

Let the liquid bottle 5 have a refractive index of nl and a refractive index of about 1 in air. By the law of refraction: sina = nlsinP- nlsinY=sin0, then α θ. Similarly, θ, =α, can be obtained. Θ and Θ are the two base angles of the isosceles triangle, so θ = θ, then α = θ = θ, = α,.

Thereby, the angle ε between the infrared ray S11 incident on the outer surface of the outer casing of the liquid collecting bottle 5 and the infrared ray S13 emitted from the inner surface is mainly caused by the incident point of the infrared ray on the outer surface of the outer casing of the liquid collecting bottle 5 and the emission from the inner surface. The deflection determination of the arc normal at two points can be approximated:

ε= δ ~ h tanp/R=h/R tan[arcsina I nl]

The angle between the infrared ray S12 incident on the inner surface of the liquid collection bottle 5 and the infrared ray S13 on the outer surface of the outer casing of the liquid collection bottle 5 is also δ. The angle between the infrared S11 and the infrared S13 should be 2ε=2δ - 2h/R tan(arcsina / nl).

When h«R, δ is negligible, the infrared ray S11 incident on the outer surface of the outer casing of the liquid collecting bottle 5 is substantially parallel to the infrared ray S13 which is emitted from the outer surface of the outer casing of the liquid collecting bottle 5.

Therefore, as shown in Fig. 4, the receiving unit 92 and the transmitting unit 91 are disposed on the same horizontal line, and the receiving unit can receive the refracted infrared rays, and therefore, it is judged that there is no oozing liquid.

Similarly, the infrared light path when the liquid collection bottle 5 between the transmitting unit 91 and the receiving unit 92 has a transparent exudate can be further analyzed. Referring to FIG. 5, FIG. 5 shows that the corresponding position in the liquid collecting bottle has oozing out. Light path diagram when liquid:

Let the refractive index of the exudate be η2, then the law of refraction:

Sina = n2 sinG = n2 sinG' = sina'.

The angle between the infrared ray l1 incident on the outer surface of the liquid collection bottle 5 and the infrared ray S12 emitted from the inner surface ε:

ε = (α-θ) +δ = [a-arcsin(sina / η2 ) ]+δ - [a-arcsin(sina / η2 )] + h/R tan(arcsina / nl);

When h«R, δ is negligible, the angle ε: 8 ~ a-arcsin(sina / n2 );

The angle between the infrared S 11 and the infrared S 13 should be: 2ε 2 [a-arcsin(sina / n2 )]; Example: When a=30. That is, π/6 radians, and the refractive index of the exudate is assumed to be close to water, which is η2=1.33. Then, the angle between the infrared S11 and the infrared S13 should be: 2ε 0.276 radians, that is, 15.8. . That is, when there is exudate in the liquid collecting bottle 5, the angle between the incident and outgoing rays can be about 15.8. The change. Therefore, referring to Fig. 5, the receiving unit 92 does not receive infrared light, and therefore, it can be judged that there is wound exudate in the liquid collecting bottle 5.

By utilizing this characteristic, the position of the receiving unit 92 is set so that it can receive the emitted light only when the liquid collecting bottle 5 has no oozing liquid, and cannot be received when the liquid collecting bottle 5 has the exudate at a predetermined position. The outgoing light can determine the position of the liquid in the liquid collection bottle 5, and thereby the amount of liquid in the liquid collection bottle 5.

When the liquid prevents the electromagnetic wave from passing through, or the electromagnetic wave is very weak after passing through the liquid; in the case where the liquid collecting bottle 5 has an exudate at a predetermined position, the receiving unit 92 cannot receive the emitted electromagnetic wave. Please refer to FIG. 6. FIG. 6 is an optical path diagram showing the opaque exudate at the corresponding position in the liquid collecting bottle in the first embodiment and the electromagnetic wave being visible light. Due to the opaque liquid in the liquid collection bottle 5, the visible light S12 is blocked, and the receiving unit 92 receives no visible light.

Embodiment 2

Referring to FIG. 7, the difference between this embodiment and the first embodiment is that, in this embodiment, the transmitting unit and the receiving unit in each detecting module 9 are disposed on the same side of the liquid collecting bottle 5, and the transmitting unit emits electromagnetic waves or ultrasonic waves. The signal, if the receiving unit can receive the electromagnetic wave or ultrasonic signal reflected by the liquid collecting bottle 5, it can be determined that there is no exudate at the detecting module, and vice versa, it can be determined that there is exudate at the position. Referring to the optical path diagram of the Β portion of FIG. 7 shown in FIG. 8, the transmitting unit 91 emits infrared ray S1, which is partially refracted to form a refracted ray S3, which is partially reflected, and the reflected ray S2 is received by the receiving unit 92, thereby judging the detecting module 9 The position corresponds to the effluent bottle 5 where there is no effluent; the relative position of the firing unit 91 and the receiving unit 92 can be determined by a limited number of experiments to accurately detect the amount of liquid in the sump 5. The rest and implementation - to, no longer repeat them here.

Embodiment 3

The difference between this embodiment and the foregoing two embodiments is that only one detecting module 9 is provided. Referring to FIG. 9, the detecting module 9 is sleeved on a threaded rod 10 extending vertically on a center line, and the center line and set of the screw rod 10 The liquid bottle 5 is parallel in the up-and-down direction; preferably, the detecting module 9 is restrained in the circumferential direction of the center line of the screw shaft 10, and can only move in the direction of the center line of the screw rod 10; one end of the screw rod 10 is connected to the motor 11, in Under the driving of the motor 11, the screw shaft 10 rotates around its center line, thereby driving the detecting module 9 to move down the center line of the screw rod 10, and detecting whether the corresponding position of the liquid collecting bottle 5 has liquid. Wherein, the screw 10 can also be replaced by any other transmission mechanism such as: gear set, belt, and leather wheel; as long as the detection module 9 can move in the vertical direction relative to the liquid collection bottle 5, the detection liquid collection can be realized. The purpose of the bottle 5 corresponding to the amount of liquid.

The detecting module 9 in this embodiment drives the detecting module 9 up and down by the screw 10 when the motor 11 is in operation. When the receiving unit jumps between the infrared signal and the undetectable infrared signal, the detecting module 9 determines that the position at this time corresponds to the liquid surface, and then determines the liquid level of the liquid collecting bottle 5 according to the stroke of the motor, thereby The amount of the permeate in the liquid collection bottle 5 was calculated.

In each of the above embodiments, when there is no liquid in the liquid collecting bottle 5 and the position where the detecting module 9 is located, the receiving unit 92 can receive an electromagnetic wave signal or an acoustic wave signal, and when there is liquid at the position where the detecting module 9 is located, the receiving unit is provided. 92 can not receive the electromagnetic wave signal or the acoustic wave signal; further, when the receiving unit 92 does not receive the electromagnetic wave signal or the acoustic wave signal, it is judged that the position of the detecting module 9 is stagnant. According to the above description, it is also possible to determine in the opposite manner that the position of the detecting module 9 is a liquid stagnation. For example, when the electromagnetic wave signal or the acoustic wave signal can pass through the liquid collection bottle 5 and the liquid, the receiving unit 92 can receive the electromagnetic wave signal or the acoustic wave signal when the liquid is present at the position where the detecting module 9 is located, where the detecting module 9 is located. When the position is free of liquid, the receiving unit 92 can not receive the electromagnetic wave signal or the acoustic wave signal, and according to whether the receiving unit 92 receives the electromagnetic wave signal or the acoustic wave signal, it is judged that the position of the detecting module 9 is stagnant, thereby realizing the detection of the liquid collecting bottle. 5 The purpose of the amount of liquid. In addition, it is also possible to judge whether the position of the detecting module 9 is stagnation liquid or the like according to the difference between the received signal strength of the electromagnetic wave signal or the acoustic wave signal.

The negative pressure wound treatment system for the amount of liquid in the detectable liquid collection bottle of the present invention can measure the amount of liquid in the liquid collection bottle of the negative pressure wound treatment system, and makes the use of the negative pressure wound treatment system more intelligent.

The above is only a preferred embodiment of the present invention, and it should be noted that the above-described preferred embodiments should not be construed as limiting the scope of the invention, and the scope of the invention should be determined by the scope of the claims. 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.

Claims

Rights request

1. A negative pressure wound treatment system capable of detecting the amount of liquid in a liquid collection bottle, comprising:

Liquid collection bottle, collecting wound exudate;

Negative pressure wound treatment equipment, including a negative pressure source and a controller;

2. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collecting bottle according to claim 1, wherein when the receiving unit does not receive the electromagnetic wave or the acoustic wave signal, it is judged that there is wound exudation at the position of the detecting module. Liquid; or,

When the receiving unit receives an electromagnetic wave or an acoustic signal, it is judged that there is a wound exudate at the position of the detecting module.

The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, wherein the electromagnetic wave is any one of infrared rays, visible light, and ultraviolet rays.

A negative pressure wound treatment system for detecting a liquid amount in a liquid collection bottle according to claim 1, wherein said electromagnetic wave is a laser.

5. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, wherein the liquid collection bottle is provided with a plurality of gear positions for characterizing the level of the wound exudate liquid, The gear positions correspond to one detection module.

6. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 5, further comprising an alarm, detection control of the detection module corresponding to the gear position characterizing the highest liquid level height When the unit determines that there is wound exudate in the gear position, an alarm trigger signal is sent to the alarm, and the alarm device issues an alarm signal.

7. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, wherein said detection control unit controls the intensity of electromagnetic waves or sound waves emitted from the emission unit.

8. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, The detection control unit controls an encoding rule of electromagnetic waves or sound waves emitted by the transmitting unit, and determines whether the receiving code is valid according to the encoding rule, and further controls whether the receiving unit receives or not.

9. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, comprising 2 to 10 said detection modules.

10. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 5, further comprising a display unit, said display unit being connected to said detection control unit, and displaying a liquid collection bottle A gear that characterizes the level of wound exudate fluid.

11. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 1, wherein said detection module is disposed on a transmission mechanism, and said transmission mechanism is coupled to a drive mechanism.

12. The negative pressure wound treatment system for detecting the amount of liquid in a liquid collection bottle according to claim 11, wherein the transmission mechanism is any one of a screw rod, a gear set, a belt, and a leather wheel.