JPWO2020070103A5 - - Google Patents

Claims (15)

A drainage device for removing fluid from a body cavity of a patient, said device (16) comprising a drainage tube (3) and pressure sensing means (24; 370), said drainage tube (3) ) is connectable to a pump unit (18), the pump unit (18) is configured to apply suction pressure to the fluid in the body cavity (31), and the pressure sensing means (24 ;370) is a drainage device configured to detect when the applied suction pressure is at or above a predetermined threshold level. 2. The method of claim 1, wherein said pressure sensing means is a pressure relief valve (24), said valve (24) being adapted to open when pressure is at or above said predetermined threshold level. drainage device. The pressure relief valve (24), when open, is configured to allow air (A) to flow through the drain (3), thereby reducing suction pressure. Item 3. The drainage device according to item 2. 4. The drainage device of claim 2 or 3, further comprising a check valve (32) for preventing air from the pressure relief valve (24) from entering the patient (28). 5. A drainage device according to any one of claims 2 to 4, further comprising a filter unit (27) arranged to remove contaminants from air entering through the pressure relief valve (24). 2. The drainage of claim 1, wherein the pressure sensing means comprises a pressure sensor (340) and a shape memory metal valve (370) configured to control the suction pressure applied to fluid within the body cavity (31). Device. The pressure sensor (340) is configured to transmit an electrical current (430) to the valve (370), thereby causing the valve (370) to expand and air (A) to flow therethrough. 7. A drainage device according to claim 6, forming an opening (400) configured to allow a suction pressure to be reduced thereby reducing suction pressure. 8. A drainage device according to any preceding claim, further comprising a pressure indicator (35) configured to warn when pressure is at or above the threshold level. Said pressure indicator (35) may be one or more of a visual indicator, such as a lamp, LED, propeller means, color display means, or visible airflow, or an audible indicator, such as a whistle means or bellows means. 9. The drainage device of claim 8, wherein A first end (7a) of said drain (3) is connectable to a patient side tube (19) of a patient (28) and a second end of said drain (3). 10. A drainage device according to any one of the preceding claims, wherein (7b) is connectable to a collection unit (8) for collection of removed fluid. 11. Drainage device according to claim 10 , wherein the pressure sensing means (24; 34) is arranged between the patient tube (19) and the drain (3). 12. Drainage device according to claim 10 or 11, wherein the patient tube (19) is a chest tube (19). 13. A drainage device according to any preceding claim, wherein the predetermined threshold level of suction pressure is between 20 cmH2O (1.962 kPa) and 60 cmH2O (5.886 kPa). A method for regulating the suction pressure of a drainage device according to any one of claims 1 to 13, the method comprising:
- determining a threshold level of suction pressure;
- providing the drainage device with pressure sensing means (24; 34);
- detecting, using said pressure sensing means (24; 34), when the applied suction pressure is at or above said threshold level of suction pressure; and then - adjusting the applied suction pressure. a step;
A method. 15. A method according to claim 14, wherein said adjusting step is performed by opening a valve (24) or by a sensor (34) communicating with a microprocessor (33) adjusting said pump unit (18).