Disposable gravity-driven negative pressure drainage system

Abstract

A disposable gravity-driven negative pressure drainage system comprises a disposable sealed negative pressure generator 100, a negative pressure output port 400, a fluid conduit 20, a first flow control unit 200, a second flow control unit 500 and a collection reservoir 300. Sterile working fluid is pre-arranged in the negative pressure generator 100, and the negative pressure generator 100 is positioned above the collecting storage device 300 in a hanging manner; working fluid flows into the collection storage device 300 through the fluid conduit 20 under the action of gravity, so that continuous negative pressure is generated in the negative pressure generator 100 and acts on the body cavity of a patient through the negative pressure output port 400; drainage liquid enters the collection reservoir 300 through the same fluid channel. The whole system is aseptically packaged and is disposable. Electric power, elastic pieces or vacuum tanks are not needed, the structure is simple, cost is low, and the size is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a disposable closed drainage system for establishing negative pressure instantaneously by using gravity potential energy, which is suitable for drainage of thoracic cavity, abdominal cavity, wound surface or interstitial space after operation or trauma. BACKGROUND

[0002] The existing negative pressure drainage system mainly relies on electric vacuum pump, elastic negative pressure ball or pre-vacuum rigid tank. The electric device has high cost, needs power supply and has loud noise; the elastic ball negative pressure decays quickly with time and cannot sustain stable pressure; the pre-vacuum tank has large volume and high transportation requirement. There is an urgent need for a disposable, passive, simple structure and overall disposable drainage scheme. SUMMARY

[0003] The present application relates to the field of medical devices, in particular to a disposable closed drainage system for establishing negative pressure instantaneously by using gravity potential energy, which is suitable for drainage of thoracic cavity, abdominal cavity, wound surface or interstitial space after operation or trauma. The technical scheme adopted by the present application to achieve the above object is as follows: a disposable gravity-driven negative pressure drainage system, comprising a negative pressure generator 100, a negative pressure output port 400, a fluid conduit 20, a first flow control unit 200, a second flow control unit 500 and a collection reservoir 300. The negative pressure generator 100 is a disposable sealed container with sterile working fluid pre-installed inside; the negative pressure output port 400 is arranged on the upper part of the negative pressure generator 100 and communicates with the patient's drainage pipeline; the fluid conduit 20 connects the lower part of the negative pressure generator 100 and the collection reservoir 300; the collection reservoir 300 is positioned below the negative pressure generator 100; the first flow control unit 200 is arranged between the negative pressure output port 400 and the negative pressure generator 100; the second flow control unit 500 is arranged on the fluid conduit 20. The vertical distance between the negative pressure generator 100 and the collection reservoir 300 allows the working fluid to flow under the action of gravity, thereby forming negative pressure at the negative pressure output port 400. Advantages

[0004] Passive: no power, elastic body or vacuum pump, low cost; Constant negative pressure: as long as the working fluid is not empty, the gravity potential energy is constant, and the negative pressure does not decay; Disposable: overall sterile packaging, overall disposal after use, avoiding cross infection; Simple structure, small volume, transportation and storage cost is only 1 / 5-1 / 10 of that of traditional negative pressure tank. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 The overall structure of the present application is shown in the figure.

[0006] Reference signs: 100: negative pressure generator; 400: negative pressure output port; 20: fluid conduit; 200: first flow control unit; 500: second flow control unit; 300: collection reservoir.

[0007] Specific embodiments Example 1 The negative pressure generator 100 uses a 100 mL medical PVC bag, and pre-sets 80 mL of sterile normal saline; the collection reservoir 300 is an 800 mL empty bag; the first flow control unit 200 and the second flow control unit 500 are both one-way check clamps; the negative pressure generator 100 is hung at a fixed height of 30 cm, generating a negative pressure of about -3 kPa, which is used for post-abdominal surgery drainage.

[0008] Example 2 The negative pressure generator 100 uses a 50 mL polypropylene hard cylinder, and pre-sets 40 mL of sterile water; the collection reservoir 300 is a 500 mL scale bag; the first flow control unit 200 is a plug valve, and the second flow control unit 500 is a thin film easy-to-tear valve; the hanging height is fixed at 25 cm, generating a negative pressure of about -2.5 kPa, which is used for closed thoracic drainage.

[0009] Example 3 The negative pressure generator 100 is a 200 mL EVA co-extrusion film bag, pre-set with 150 mL of sterile water containing 0.05% triclosan; the collection reservoir 300 is a 1 L bag with an anti-reflux film flap and an exhaust filter film; the hanging height is fixed at 40 cm, generating a negative pressure of about -4 kPa, which is used for continuous negative pressure drainage of wound surface.

Claims

1. A disposable gravity-driven negative pressure drainage system, characterized in that, include: a) The negative pressure generator 100 is a disposable sealed container with a pre-set volume of working fluid inside; b) A negative pressure output port 400, located at the upper part of the negative pressure generator 100, for connection to a patient drainage tube; c) A fluid conduit 20, with its first end connected to the lower part of the negative pressure generator 100 and its second end connected to a collection reservoir 300; d) A first flow control unit 200, located between the negative pressure output port 400 and the negative pressure generator 100; e) A second flow control unit 500, located in the flow path of the fluid conduit 20; f) A collection reservoir 300, a flexible or rigid cavity, positioned below the negative pressure generator 100; wherein the vertical distance between the negative pressure generator 100 and the collection reservoir 300 allows the working fluid to flow under gravity, thereby creating negative pressure at the negative pressure output port 400.

2. The system according to claim 1, wherein the working fluid is a sterile liquid, and its volume accounts for 30% to 95% of the internal volume of the negative pressure generator 100.

3. The system according to claim 1 or 2, wherein the first flow control unit 200 and the second flow control unit 500 are each independently a pinch valve, a plug valve, a one-way check valve, or a diaphragm easy-tear valve.

4. The system according to any one of claims 1-3, wherein the negative pressure generator 100 is a flexible bag or a rigid cylinder, and the material is selected from medical PVC, PP, PE, EVA or their multilayer co-extruded film.

5. The system according to any one of claims 1-4, wherein the negative pressure output port 400 and the collection reservoir 300 are both configured with a standard Luer lock, a quick-connect connector or a screw interface.

6. The system according to any one of claims 1-5, wherein the collection reservoir 300 is provided with an anti-backflow membrane flap, an exhaust hydrophobic filter membrane, and a volume scale.

7. The system according to any one of claims 1-6, wherein the entire system is encapsulated within a sterile barrier for single use and is disposed of as medical waste after use.

8. A method for performing negative pressure drainage using the system according to any one of claims 1-7, comprising the steps of: a) Connect the negative pressure output port 400 to the patient's drainage tube; b) Position the collection reservoir 300 below the negative pressure generator 100; c) Turn on the first flow control unit 200 and the second flow control unit 500, allowing the working fluid to flow into the collection reservoir 300 under gravity, instantly establishing a negative pressure and starting to drain; d) After the drainage is complete, turn off the first flow control unit 200 and the second flow control unit 500, and discard the entire device.

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