초록 ▼

A switching device for a fluid distribution set presenting a deformable portion having a first port, a second port, a third port and a fourth port, is disclosed. The switching device comprises an active portion adapted, in use, for clamping the deformable portion of the fluid distribution set, and a

A switching device for a fluid distribution set presenting a deformable portion having a first port, a second port, a third port and a fourth port, is disclosed. The switching device comprises an active portion adapted, in use, for clamping the deformable portion of the fluid distribution set, and a housing body defining a seat for receiving the deformable portion. The switching device can be operated according to first and second clamping positions, wherein the active portion is approached to a corresponding active surface of the housing body. A fluid control apparatus comprising the above switching device and the portion of the fluid distribution set is also described.

대표청구항 ▼

The invention claimed is: 1. Switching device for a fluid distribution set, said set presenting an at least partially deformable portion having a first port, a second port, a third port and a fourth port, the switching device comprising: clamping means having at least an active portion adapted, in

The invention claimed is: 1. Switching device for a fluid distribution set, said set presenting an at least partially deformable portion having a first port, a second port, a third port and a fourth port, the switching device comprising: clamping means having at least an active portion adapted, in use, for clamping said at least partially deformable portion of the fluid distribution set, a housing body defining a seat for receiving said at least partially deformable portion, the clamping means being coupled with the housing body and being positionable according to at least a first and a second clamping positions, wherein the active portion is positioned near a corresponding active surface of the same housing body. 2. Device according to claim 1, wherein said housing body comprises a first element having a base wall, defining at least a portion of said active surface, and a side wall emerging from said base wall, laterally delimiting said seat and defining an access for positioning of the at least partially deformable portion. 3. Device according to claim 2, wherein the sidewall of the first element presents radial passages for seating conduit segments defining said ports of the at least partially deformable portion. 4. Device according to claim 3, further comprising a second element movably coupled to the first element, the second element rigidly carrying the clamping means. 5. Device according to claim 4, further comprising urging means for forcing said active portion towards the first element, the urging means including a knob acting on the second element and at least one bayonet joint coupling between the knob and the first element. 6. Device according to claim 2, wherein the clamping means comprises: at least an axle carrying the active portion, and means, active on the axle, for urging the active portion towards the at least partially deformable portion. 7. Device according to claim 6, further comprising a second element coupled to the first element and presenting a through aperture for axially guiding at least a portion of the axle. 8. Device according to claim 7, wherein the clamping means further comprises a knob axially connected to the axle, and a flange carried by the axle, said second element being axially interposed between the knob and the first element, said urging means being arranged between the flange and the second element. 9. Device according to claim 8, wherein the clamping means further comprises a terminal bore carried by the axle, said urging means being arranged between said bore and the first element. 10. Device according to claim 9, wherein the base of the first element includes a cap, said cap being movably coupled to the first element, and wherein the clamping means further comprises a terminal bore carried by the axle, said urging means being arranged between said bore and the cap. 11. Device according to claim 6, wherein the urging means comprises an automatic actuator able to move back and forth according to a prefixed direction of said axle. 12. Device according to claim 11, further comprising a second element coupled to the first element and presenting a through aperture for axially guiding at least a portion of the axle. 13. Device according to any one of claims 7, or 11, wherein the second element comprises a top wall and a side wall emerging from the top wall for partial closure of said seat, the second element defining at least a zone facing the first element and adapted to host at least said active portion in a rest position. 14. Device according to claim 7 or 9, wherein the second element is fixable to the first element. 15. Device according to claim 8 or 9, wherein the axle is rotatively engaged to the housing and is able to be axially lifted and lowered relative to said second element. 16. Device according to claim 8 or 9, wherein the knob is rotatively engaged to the second element and is able to be axially lifted and lowered relative to said second element, said flange presenting an abutting surface designed to define an axial stroke end against the wall of the second element. 17. Device according to claim 15, wherein the clamping means include an actuator connected the axle to axially lift and lower said axle relative to said second element and/or to turn the axle around its longitudinal axis to thereby achieve an angular displacement of the active portion. 18. Device according to claim 6, wherein the urging means comprises at least a resilient element. 19. Device according to claim 6, wherein the urging means comprises magnetic or electromagnetic couples. 20. Device according to claim 19, wherein the magnetic or electromagnetic couples comprise a main body fixed relative to said active portion, said main body being magnetic or magnetized or capable of being magnetized, and an auxiliary body fixed relative to the first element, said auxiliary body being magnetic or magnetized or capable of being magnetized. 21. Device according to claim 1, wherein the clamping means can also be positioned according to a rest position, a distance of the active portion from the corresponding active surface of the receiving means in said clamping position being smaller than said distance in correspondence of the rest position. 22. Device according to claim 1, comprising control means for allowing the clamp means to clamp the at least partially deformable portion in prefixed clamping positions only. 23. Device according to claim 22, wherein the control means comprises: a guide profile carried by the housing body, at least a cursor member adapted to follow the guide profile and mechanically connected to the active portion. 24. Device according to claim 23, wherein the guide profile is carried by the second element and comprises a track and indents directed towards said first portion. 25. Device according to claim 24, wherein the cursor member runs in the track, said cursor member being carried by the knob and being positionable according to at least two functionally different clamping positions, wherein said cursor member is positioned in one of said indents and the urging means are able to move the active portion in one of the clamping positions, and one or more rest positions wherein the cursor member is positioned on said track outside the indents and the urging means are unable to move the active portion in a clamping position. 26. Device according to claim 25, wherein the guide profile includes at least two angularly spaced indents. 27. Device according to claim 25, wherein said guide profile is formed on the top surface of said second element facing said knob, said profile including four angularly equally spaced indents and the knob carrying two angularly opposite cursor members for defining two clamping positions, said clamping positions corresponding to the clamping means, said clamping means being designed to deform the at least partially deformable portion according to at least respective clamp lines separated by 90 degrees from each other. 28. Device according to claim 22, wherein return means is arranged between the clamping means and the second element to force the clamping means towards one of said clamping positions. 29. Device according to claim 28, wherein the return means comprises a resilient or a magnetic or an electromagnetic coupling arranged between the knob and the second element. 30. Device according to claim 1, wherein the clamping means is positionable in two positions only. 31. Fluid control apparatus comprising a switching device according to claim 1, said apparatus also comprising an at least partially deformable portion of a fluid distribution set, said at least partially deformable portion having a first port, a second port, a third port and a fourth port. 32. Fluid control apparatus according to claim 31, wherein the at least partially deformable portion is adapted to be put in fluid communication with a venous tube and an arterial tube of the distribution set by means of said ports. 33. Fluid control apparatus according to claim 32, wherein the at least partially deformable portion comprises a common chamber and said first, second third, and fourth ports communicating with the common chamber and being adapted to be put in fluid communication with a corresponding respective portion of the venous line or the arterial line. 34. Fluid control apparatus according to claim 32, wherein the at least partially deformable portion comprises an annular tubing presenting said four ports. 35. Fluid control apparatus according to claim 34, wherein the annular tubing comprises: a pair of first tubes, and a pair of second tubes transverse to said first tubes. 36. Fluid control apparatus according to claim 31, wherein the active portion corresponding to said clamping positions is active on the at least partially deformable portion so that flow either is precluded from the first and third ports and redirected to the second and fourth ports, or precluded from the first and fourth ports and redirected to the second and third ports. 37. Fluid control apparatus according to claim 36, wherein the active portion in said clamping positions is arranged to clamp over a clamp area and to clamp over the entire clamp area substantially simultaneously. 38. Fluid control apparatus according to claim 31, wherein the conduit segments can be lightly forced or snapped into said radial passages to secure a stable positioning of the at least partially deformable portion. 39. Blood treatment equipment comprising: a fluid control apparatus according to claim 31, and a fluid distribution set, said fluid distribution set having a blood treatment unit having a first and a second chamber separated by a semipermeable membrane, and first and second lines connected to the treatment unit first chamber and to the at least partially deformable portion.