1. A tubular guidewire assembly comprising:
a tubular guidewire member having a distal end, a proximal end and a lumen defined therein;
an occlusive balloon proximate the distal end and fluidly connected to the lumen; and
an extended crimpable section proximate the proximal end and fluidly connected to the lumen, the extended crimpable section adapted to be selectively sealed at one of a plurality of separate locations to form an airtight seal of the tubular guidewire assembly.
2. The tubular guidewire assembly of claim 1 wherein the guidewire assembly has an effective length of at least 40 cm and an outer diameter of less than 0.060 inches, the extended sealable section has an effective length of at least 1 cm and an outer diameter of less than 0.050 inches and the occlusive device is deflated in less than two minutes.
3. The tubular guidewire assembly of claim 1 wherein the guidewire assembly has an effective length of at least 100 cm and an outer diameter of less than 0.018 inches, and the extended crimpable section has an effective length of at least 5 cm and an outer diameter of less than 0.012 inches.
4. The tubular guidewire assembly of claim 1 wherein the crimpable section is dimensioned such that an effective outer diameter of the crimpable section after crimping is no greater than an outer diameter of the guidewire member of the guidewire assembly.
5. The tubular guidewire assembly of claim 1 wherein the extended crimpable section has a length sufficient to permit a plurality of crimps and a plurality of corresponding cuts along the crimpable section and has a diameter that is small than a diameter of the main body of the guidewire.
6. The tubular guidewire assembly of claim 1 wherein the tubular guidewire member includes a main body formed of a stainless steel hypotube.
7 The tubular guidewire assembly of claim 6 wherein the extended crimpable section is collinearly attached to the proximal end of the stainless steel hypotube and is formed of a stainless steel hypotube having a diameter small than the stainless steel hypotube of the main body.
8. The tubular guidewire assembly of claim 6 wherein the tubular guidewire member further includes a distal portion formed of a NiTi alloy.
9. The tubular guidewire assembly of claim 8 wherein the distal portion includes a tapered portion.
10. The tubular guidewire assembly of claim 9 wherein the tapered portion has an inner diameter of less than 0.05 inches and an outer diameter that decreases in ranges from at least 0.012 inches to less than 0.008 inches.
11. The tubular guidewire assembly of claim 8 wherein the distal portion includes a platinum markerband proximal to the occlusive balloon.
12. The tubular guidewire assembly claim 8 further comprising a flexible coil tip attached to distal portion distal to the occlusion balloon.
13. The tubular guidewire assembly of claim 1 wherein the occlusive balloon is capable of repeated inflation and deflation during a vascular procedure in between which the proximal end of the guidewire assembly is free of mechanical connections and obstructions and functions as a conventional exchange guidewire.
14. The tubular guidewire assembly of claim 1 wherein the lumen has an inner diameter of at least 0.002 inches such that passive deflation of the occlusive balloon is accomplished in less than one minute.
15. The tubular guidewire assembly of claim 1 wherein the crimpable section is formed of a material dimensioned such that the crimpable section has sufficient strength in terms of high tensile and kink resistance to permit catheter devices to repeatedly pass over the crimpable section yet, when severed, the crimpable section does not penetrate a standard surgical glove when gripped within less than one inch of a proximate end of the crimpable section.
16. The tubular guidewire assembly of claim 1 wherein the occlusion balloon is preinflated to prestretch balloon so balloon expansion is relatively linear with pressure.
17. The tubular guidewire assembly of claim 1 wherein the extended crimpable section is weakened at a plurality of score locations along the extended crimpable section to aid in severing the crimpable section at the score locations.
18. The tubular guidewire assembly of claim 1 wherein the tubular guidewire member and the extended crimpable section are formed of a continuous stainless steel tube having a second wire wound therearound except for along the crimpable section.
19. The tubular guidewire assembly of claim 1 wherein the tubular guidewire member comprises a braided polyimide hypotube having a tapered core rod positioned therein.
20. The tubular guidewire assembly of claim 19 wherein at least a proximal portion of the tapered core rod is tubular having a lumen defined therein and extending proximal a proximate end of the polyimide hypotube to define the extended crimpable section.
21. The tubular guidewire assembly claim 1 further comprising a pair of coil sections positioned along a distal portion of the guidewire member that are longitudinally spaced apart and adjacent to at least one hole in the guidewire member that provides fluid access between the lumen and the occlusive balloon, with at least a portion of the balloon being bonded to at least a portion of each of the coil sections.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An accumulator comprising:
an accumulator housing which is provided with an oil port connected to a pressure piping and is provided with a gas charging port in an end portion at an opposite side;
a stay which is arranged at an inner side of said oil port within said housing and is provided with a liquid passage in an end surface portion on an end of a stepped tubular portion;
a bellows which is arranged within said housing, is provided with a bellows cap on a floating end and comparts a space within said housing into a gas chamber being charged with a gas and a liquid chamber communicating with said oil port;
a safety mechanism for a pressure drop time which confines a part of liquid in said liquid chamber on the basis of sealing between said bellows cap or a member retained by said bellows cap and the end surface portion of said stay at a time when pressure of said liquid chamber is lowered in accordance with a pressure drop of said pressure piping; and
a safety mechanism for an emergency time which opens said liquid chamber on the basis of buckling of said stay due to a step of said stepped tubular portion by said bellows cap or the member retained by said bellows cap pressing said stay in response to housing internal pressure which becomes higher pressure at an emergency time such as a fire occurrence or the like, wherein the step of said stay is provided circumferentially partially with a thin portion so that the end surface portion of said stay readily inclines at a time when said bellows cap presses said stay and said stay buckles due to said step at said emergency time.