DEVICE AND METHOD FOR MONITORING ACCESS TO A PATIENT, IN PARTICULAR ACCESS TO VESSELS DURING EXTRACORPOREAL BLOOD TREATMENT

• US 20090306574A1
• Filed: 12/08/2006
• Published: 12/10/2009
• Est. Priority Date: 03/11/2006
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Original Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Inventors: Kopperschmidt, Pascal
• Granted Patent: US 8,177,736 B2
• Time in Patent Office: Days
• US Class Current: 604/6.160
• CPC Class Codes: A61M 1/3653 Interfaces between patient blood circulation and extra-corporal blood circuit
• CPC Class Codes: A61M 1/3655 Arterio-venous shunts or fistulae
• CPC Class Codes: A61M 1/3656 Monitoring patency or flow at connection sites; Detecting disconnections
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 5/1418 Clips, separators or the like for supporting tubes or leads
• CPC Class Codes: Y10T 24/3439 Plural clasps
• CPC Class Codes: Y10T 24/44 Clasp, clip, support-clamp, or required component thereof
• CPC Class Codes: Y10T 24/44538 Integral locking-means
• CPC Class Codes: Y10T 403/22 with fluid pressure responsive component

Abstract

The invention relates to a device and to a method for monitoring access to vessels during extracorporeal blood treatment. The invention forms a loop in the arterial and/or venous line and provides device for fixing a section of the line in a loop. When the line is stressed under tension, the loop contracts and the line finally kinks. The modification of the diameter of the line and the formation of a kink in the line leads to a rise of pressure in the line, which is monitored by a pressure monitoring device. If the pressure exceeds a predetermined threshold value, the aspirating cannula is in danger of slipping out of the vessel access or has partially or completely slipped out, thus allowing the threshold value to be determined for alarms.

Claims

1-17. -17. (canceled)

18. A device for monitoring vascular access in extracorporeal blood treatment comprising:

a first fixing element capable of tightly receiving a first segment of a hose line,

a second fixing element capable of loosely receiving a second segment of a hose line,

whereby the first fixing element and the second fixing element are adapted to form a loop in a hose line between the first segment and the second segment.

19. The device of claim 18, wherein the first fixing element has a C-shape comprising a curved central portion and two end pieces defining a gap therebetween for receiving the hose line.

20. The device of claim 19, wherein the second fixing element has a C-shape comprising a curved central portion and two end pieces defining a gap therebetween for receiving the hose line.

21. The device of claim 20, wherein the two end pieces of at least one of the first fixing element or second fixing element extend at an angle outwardly from the C-shape.

22. The device of claim 19, wherein the second fixing element has an upper semi-circular portion and a lower semi-circular portion.

23. The device of claim 22, wherein the upper semi-circular portion has a first locking portion and the lower semicircular portion has a second locking portion,

the first locking portion and the second locking portion capable of unlocking in an open position to receive the hose line, and

the first locking portion and the second locking portion capable of locking together in a closed position to hold the hose line.

24. The device of claim 18, wherein the first fixing element and the second fixing element are connected.

25. The device of claim 18, wherein the first fixing element has a first opening for receiving the first segment of hose line, and the second fixing element has a second opening for receiving the second segment of hose line, and the first opening is smaller than the second opening.

26. The device of claim 25, wherein a diameter of the first opening is smaller than a diameter of the second opening.

27. The device of claim 18, further comprising a hose line, wherein the hose line has a first segment held tightly within the first fixing element, a second segment held loosely within the second fixing element, and a loop formed between the first fixing element and second fixing element.

28. The device of claim 27, wherein the loop can tighten when a tractive force is applied to the second segment of the hose.

29. The device of claim 28, wherein when the loop tightens, the pressure in the hose line can increase above a pre-set limit.

30. The device of claim 27, wherein the hose line further comprises a predetermined kinking point.

31. The device of claim 30, wherein the predetermined kinking point has a first wall thickness and the rest of the first segment and the second segment has a second wall thickness, and the first wall thickness is less than the second wall thickness.

32. The device of claim 30, wherein the predetermined kinking point has a non-round cross-section and the rest of the first segment and the second segment has a round cross-section.