Author: claimsbot

1. A one-of-many selection circuit comprising a one-of-many shift register comprising a data input and a clock input, the one-of-many shift register comprising:
a plurality of series-connected shift registers, wherein each shift register comprises:
a first latch which is implemented to take over a signal state applied to its data input in a transparent operating state and to maintain the taken-over signal state in a non-transparent operating state;
a second latch which is implemented to take over a signal state applied to its data input in a transparent operating state and to maintain the taken-over signal state in a non-transparent operating state;
wherein the first latch and the second latch are series-connected;
wherein clock inputs of the latches are switched such that the second latch is in the transparent operating state when the first latch is in the non-transparent operating state and vice versa;
a first output circuit which is implemented to provide a predetermined level independent of the signal state existing in the first latch at a first shift register output of the shift register in the transparent operating state of the first latch and to provide a level depending on the signal state stored in the first latch in the non-transparent operating state of the first latch; and
a second output circuit which is implemented to provide a predetermined level independent of the signal state existing in the second latch at a second shift register output of the shift register in the transparent operating state of the second latch and to provide a level depending on the signal state stored in the second latch in the non-transparent operating state of the second latch;
wherein the shift registers are coupled to the data input and the clock input such that a \u201c1\u201d applied to the data input is shifted through the shift registers such that with a falling clock edge at the clock input the \u201c1\u201d is shifted on from a first shift register output of a first shift register of the plurality of shift registers to a second shift register output of the same shift register and that with a rising clock edge the \u201c1\u201d is shifted on from the second shift register output of the first shift register to a first shift register output of a subsequent shift register;
or that with a rising clock edge at the clock input the \u201c1\u201d is shifted on from a first shift register output of a first shift register of the plurality of shift registers to a second shift register output of the same shift register and that with a falling clock edge the \u201c1\u201d is shifted on from the second shift register output of the first shift register to a first shift register output of a subsequent shift register.
2. The one-of-many selection circuit according to claim 1,
wherein the clock inputs of the two latches are switched invertedly such that, when a first level is applied to the clock input of the first latch, a level complementary to the first level is applied to the clock input of the second latch.
3. The one-of-many selection circuit according to claim 1,
wherein clock inputs of the output circuits are switched invertedly such that, when a first level is applied to a clock input of the first output circuit, a level complementary to the first level is applied to a clock input of the second output circuit.
4. The one-of-many selection circuit according to claim 1,
wherein a clock input of the shift registers is coupled to the clock inputs of the latches and to the clock inputs of the output circuits, such that in response to a clock state change at the clock input of the shift registers both the operating states of the latches and also the switching states of the output circuits change.
5. The one-of-many selection circuit according to claim 1,
wherein the first output circuit comprises a first changeover switch with a first input and a second input;
wherein the first changeover switch is implemented, in its first switching state, to couple its first input to the first shift register output and, in its second switching state, to couple its second input to the first shift register output;
wherein the first changeover switch is switched such that a level applied to its first input is based on the signal state existing in the first latch and that a level applied to its second input is independent of the signal state existing in the first latch;
wherein the second output circuit comprises a second changeover switch with a first input and a second input;
wherein the second changeover switch is implemented, in its first switching state, to couple its first input to the second shift register output and, in its second switching state, to couple its second input to the second shift register output; and
wherein the second changeover switch is switched such that a level applied to its first input is based on the signal state existing in the second latch and that a level applied to its second input is independent of the signal state existing in the second latch.
6. The one-of-many selection circuit according to claim 5,
wherein clock inputs of the changeover switches are switched such that the second changeover switch is in its second switching state when the first changeover switch is in its first switching state and vice versa.
7. The one-of-many selection circuit according to claim 5,
wherein the changeover switches are clock state controlled such that the first changeover switch is in its first switching state when a first level is applied to its clock input and is in its second switching state when a level complementary to the first level is applied to the clock input of the first changeover switch and such that the second changeover switch is in its first switching state when a second level is applied to its clock input and is in its second switching state when a level complementary to the second level is applied to the clock input of the second changeover switch.
8. The one-of-many selection circuit according to claim 1,
wherein the second latch is coupled to a third shift register output such that a level at the third shift register output follows a level at the data input of the first latch after a predetermined number of clock signal edges at a clock signal input of the shift register.
9. The one-of-many selection circuit according to claim 1,
wherein the first latch comprises a first input switch and a first feedback switch switched complementarily with respect to each other;
wherein the first input switch is conductive in the transparent operating state of the first latch to take over the signal state applied to the data input of the first latch and is not conductive in the non-transparent operating state;
wherein the first feedback switch is conductive in the non-transparent operating state of the first latch to maintain the signal state taken over from the data input of the first latch in the first latch;
wherein the second latch comprises a second input switch and a second feedback switch which is switched complementarily to each other;
wherein the first input switch is conductive in the transparent operating state of the second latch to take over the signal state applied to the data input of the second latch and is not conductive in the non-transparent operating state of the second latch;
wherein the second feedback switch is conductive in the non-transparent operating state of the second latch to maintain the signal state taken over from the data input of the second latch in the second latch.
10. The one-of-many selection circuit according to claim 9,
wherein the shift registers are implemented such that the first input switch of the first latch is switched complementarily to the second input switch of the second latch and that the first feedback switch of the first latch is switched complementarily to the second feedback switch of the second latch.
11. The one-of-many selection circuit according to claim 9,
wherein the first latch comprises a first feedback loop;
wherein the first feedback loop is connected behind the first input switch and the first feedback switch is implemented to open and close the first feedback loop to take over the signal state applied to the data input of the first latch into the first feedback loop in the transparent operating state of the first latch with an opened first feedback loop and to maintain the taken-over signal state in the first feedback loop in the non-transparent operating state of the first latch with a closed first feedback loop;
wherein the second latch comprises a second feedback loop;
wherein the second feedback loop is connected behind the second input switch and the second feedback switch is implemented to open and close the second feedback loop to take over the signal state applied to the data input of the second latch into the second feedback loop in the transparent operating state of the second latch with an opened second feedback loop and to maintain the taken-over signal state in the second feedback loop in the non-transparent operating state of the second latch with a closed second feedback loop.
12. The one-of-many selection circuit according to claim 11,
wherein the first feedback loop comprises at least two series-connected inverters;
wherein the first input switch is coupled to an input of a first inverter of the at least two series-connected inverters of the first feedback loop;
wherein the first feedback switch is connected between an output of a last inverter of the at least two series-connected inverters of the first feedback loop and the input of the first inverter of the first feedback loop;
wherein the second feedback loop of the second latch comprises at least two series-connected inverters;
wherein the second input switch is coupled to an input of a first inverter of the at least two series-connected inverters of the second feedback loop; and
wherein the second feedback switch is connected between an output of a last inverter of the at least two series-connected inverters of the second feedback loop and the input of the first inverter of the second feedback loop.
13. The one-of-many selection circuit according to claim 12,
wherein the first output circuit is coupled to an output of the first inverter of the first feedback loop to provide the level provided at the first shift register output in the non-transparent operating state of the first latch depending on a level at the output of the first inverter of the first feedback loop.
14. The one-of-many selection circuit according to claim 12,
wherein the second output circuit is coupled to the output of the second inverter of the second feedback loop to provide the level provided at the second shift register output in the non-transparent operating state of the second latch depending on a level at the output of the second inverter of the second feedback loop.
15. The one-of-many selection circuit according to claim 12,
wherein a third shift register output is coupled to an output of the first inverter of the second feedback loop such that a level at the third shift register output is based on a level at the output of the first inverter of the second feedback loop and is independent of switching states of the two output circuits.
16. The one-of-many selection circuit according to claim 1,
wherein the first latch is directly connected to the second latch such that a level applied to an output of the first latch is equal to a level applied to a data input of the second latch.
17. The one-of-many selection circuit according to claim 1,
wherein a first input of the first output circuit is directly connected to an output of the first latch; and
wherein a first input of the second output circuit is directly connected to an output of the second latch.
18. An image sensor comprising a one-of-many selection circuit according to claim 1.
19. A multiplexer comprising a one-of-many selection circuit according to claim 1.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

What is claimed is:

1. An implantable osmotic pump for delivering a pharmaceutical agent to a patient, comprising:
a pump housing;
a moveable partition disposed within the housing, the partition dividing the housing into an osmotic driving compartment having an open end and a pharmaceutical agent compartment having a delivery orifice;
a first semi permeable membrane disposed in the open end of the osmotic driving compartment, the first semi permeable membrane being exposed to the patient;
a second semi permeable membrane disposed in the open end of the osmotic driving compartment, and
a first impermeable barrier disposed over the second semi permeable membrane, the second semi permeable membrane being sealed from the patient until the first barrier is breached, wherein breaching the first barrier increases the surface area of semi permeable membrane exposed to the patient and increases a delivery rate of the pharmaceutical agent through the delivery orifice.
2. The pump of claim 1, wherein the first impermeable barrier includes at least one of titanium and stainless steel.
3. The pump of claim 1, further comprising a saturated solution including NaCl between the first impermeable barrier and the second semi permeable membrane.
4. The pump of claim 1, wherein the first and second semi permeable membranes have a same composition.
5. The pump of claim 1, wherein the first and second semi permeable membranes have a same thickness.
6. The pump of claim 1, wherein the first and second semi permeable membranes have mutually different compositions.
7. The pump of claim 1, wherein the first and second semi permeable membranes have mutually different thickness.
8. The pump of claim 1, further including:
a third semi permeable member, and
a second impermeable barrier nested within the first impermeable barrier, the second impermeable barrier being disposed over the third semi permeable membrane, the third semi permeable membrane being sealed from the patient until the second impermeable barrier is breached, wherein breaching the second barrier increases the surface area of semi permeable membrane exposed to the patient and increases a delivery rate of the pharmaceutical agent through the delivery orifice.
9. The pump of claim 8, further comprising a saturated solution including NaCl between the second barrier and the third semi permeable membrane.
10. The pump of claim 1, wherein the pharmaceutical agent compartment contains sufentanil.
11. The pump of claim 10, wherein the sufentanil is at a concentration selected between about 200 gmL and about 15,000 gmL.
12. The pump of claim 1, wherein the daily delivery rate of the pharmaceutical agent through the delivery orifice is selected from about:
0.5 micrograms per day to about 25 micrograms per day when the pump is configured to be implanted intraventricularly;
0.5 micrograms per day to about 50 micrograms per day when the pump is configured to be implanted intrathecally;
5 micrograms per day to about 300 micrograms per day when the pump is configured to be implanted epidurally, and 10 micrograms per day to about 300 micrograms per day when the pump is configured to be implanted subcutaneously.
13. The pump of claim 1, wherein the first and second semi permeable membranes include cellulose acetate.
14. The pump of claim 1, wherein the first semi permeable membrane is shaped as a torus and is disposed adjacent an outer periphery of the first impermeable barrier and wherein the second semi permeable membrane is disposed in a center opening of the torus.
15. The pump of claim 1, further comprising a catheter coupled to the delivery orifice.
16. The pump of claim 15, wherein the catheter has an inner diameter of between about 0.001 inches and about 0.010 inches.
17. The pump of claim 15, wherein the catheter includes a guidewire lumen and a pharmaceutical agent infusion lumen.
18. The pump of claim 17, wherein the pharmaceutical agent infusion lumen has an inner diameter selected between about 0.001 inches to about 0.010 inches.
19. The pump of claim 15, wherein the catheter and the pump are dimensioned to infuse a volume of pharmaceutical agent of between about 1 Lday and about 10 Lday over a treatment period.
20. The pump of claim 15, wherein the catheter and the pump are dimensioned to infuse a dose of pharmaceutical agent of between about 0.5 gday and about 300 gday over a treatment period.
21. The pump of claim 15, wherein at least a portion of the catheter is radiopaque.
22. The pump of claim 17, wherein the guidewire lumen includes a valve to prevent back flow of fluid into the guidewire lumen.
23. A method for achieving an analgesic effect in a patient, the method comprising the step of administering a therapeutically effective dose of a sufentanil-containing analgesic to the patient using a device that is fully implanted in the patient.
24. The method of claim 23, wherein the dose is administered one of intravascularly, subcutaneously, epidurally, intrathecally and intraventricularly.
25. The method of claim 23, further comprising the step of selectively increasing the dose in a stepwise manner over a treatment period without removing the device from the patient.
26. The method of claim 25, wherein the dose is administered using an implanted osmotic pump that includes a first semi permeable membrane exposed to the patient and a second semi permeable membrane initially not exposed to the patient and wherein the increasing step includes a step of exposing the second semi permeable membrane to the patient.
27. The method of claim 26, wherein the second semi permeable membrane exposing step includes a step of breaching an impermeable barrier sealing the second semi permeable membrane from the patient.
28. The method of claim 27, wherein the breaching step includes a step of puncturing the impermeable barrier using a lancet while the pump remains implanted in the patient.
29. The method of claim 23, wherein the therapeutically effective dose is selected within the range of about 0.5 gday to about 300 gday.
30. A method for achieving an analgesic effect in a patient, the method comprising intraspinal administration of a therapeutically-effective dose of an analgesic to the patient by an osmotic pump and catheter integrated combination, the pump including a first semi permeable membrane across which an osmotic pressure gradient develops when the pump is implanted in the patient.
31. The method of claim 30, further including the step of selectively increasing a surface area of semi permeable membrane exposed to the patient in a stepwise manner.
32. The method of claim 30, wherein the analgesic includes sufentanil.
33. The method of claim 30, further including a second semi permeable membrane and wherein the surface area of semi permeable membrane exposed to the patient is increased by breaching an impermeable barrier initially sealing the second semi permeable membrane from the patient.
34. The method of claim 33, wherein the impermeable barrier is breached by puncturing the impermeable barrier.
35. The method of claim 31, wherein the dose is increased in a stepwise manner by sequentially breaching one of a plurality of nested impermeable barriers disposed over a corresponding plurality of the semi permeable membranes, each sequential breach exposing additional surface area of semi permeable membrane to the patient.
36. The method of claim 35, wherein each of the plurality of nested barriers is configured to be breached by a lancet, an outer diameter of the lancet determining which of the plurality of nested barriers is breached.
37. The method of claim 30, wherein the analgesic is administered one of intravascularly, subcutaneously, epidurally and intrathecally.
38. The method of claim 33, wherein the second semi permeable membrane has one of a same and different composition as the first semi permeable membrane.
39. The method of claim 33, wherein the second semi permeable membrane has one of a same and different thickness as the first semi permeable membrane.
40. An integrated implantable pump and catheter system for delivering a dose of sufentanil to a patient over a treatment period, comprising:
a pump housing;
a moveable partition disposed within the housing, the partition dividing the housing into an driving engine compartment and a pharmaceutical agent compartment having a delivery orifice;
a catheter coupled to the delivery orifice, and a preloaded amount of sufentanil in the pharmaceutical agent compartment.
41. The system of claim 40, wherein the pump and catheter are dimensioned to deliver sufentanil at an infusion rate of about 0.5 gday to about 300 gday over a treatment period.
42. The system of claim 40, wherein the system further includes a mechanical infusion rate selection structure configured to allow the infusion rate of the pump to be increased while the system is implanted in the patient.
43. The system of claim 40, wherein the infusion rate selection feature includes a plurality of semi permeable membranes across each of which osmotic pressure develops when selectively and sequentially exposed to the patient.
44. The system of claim 43, wherein each of the plurality of semi permeable membranes has a selected thickness, composition and surface area, the selected thickness, composition and surface area contributing to a rate at which the sufentanil is infused into the patient.
45. A kit comprising:
an osmotic pump;
sufentanil preloaded in the osmotic pump, and
a delivery catheter configured to be coupled to the osmotic pump.
46. The kit of claim 45, wherein the osmotic pump includes a mechanical infusion rate selection structure.
47. The kit of claim 45, and further comprising a lancet configured to act upon the infusion rate selection structure to increase an infusion rate of the sufentanil through the delivery catheter.
48. The kit of claim 45, wherein the pump is configured to deliver sufentanil at an infusion rate of a bout 0.5 gday to about 300 gday over a treatment period.
49. The kit of claim 45, wherein the catheter includes a guidewire lumen and a sufentanil delivery lumen.
50. The kit of claim 49, further comprising a guidewire.
51. The kit of claim 49, further comprising:
a guidewire;
a needle, and
a splittable introducer.
52. The kit of claim 51, wherein the needle is one of a hypodermic needle and a non-coring needle.
53. A kit comprising:
an osmotic pump that includes a mechanical infusion rate selection structure;
an amount of pharmaceutical agent preloaded into the pump, and
a delivery catheter.
54. The kit of claim 53, wherein the pharmaceutical agent includes sufentanil.
55. The kit of claim 53, wherein the infusion rate selection structure is configured to allow the infusion rate to be increased while the pump is implanted into a patient.
56. The kit of claim 53, wherein the infusion rate selection structure includes a plurality of semi permeable membranes, each of which being selectably exposable to the patient to increase a dose of pharmaceutical agent delivered to the patient.
57. The kit of claim 56, wherein each of the plurality of semi permeable membranes has an individually selected thickness, composition and surface area.
58. A method of delivering a pharmaceutical agent to a patient, comprising the steps of:
implanting an osmotic pump within the patient, the osmotic pump including the pharmaceutical agent and a plurality of semi permeable membranes across which osmotic pressure develops when exposed to the patient, and
controlling a surface area of semi permeable membrane exposed to the patient to control an infusion rate of the pharmaceutical agent analgesic to the patient.
59. The method of claim 58, further comprising the step of controlling at least one of a thickness and a composition of each of the plurality of semi permeable membranes.

1. A flame retardant polycarbonate composition which is comprised of (I) a polycarbonate, (2) a phosphoric acid ester, (3) a functionalized acrylic polymer, (4) an alkyl methacrylate-diene-vinyl aromatic terpolymer, and (5) an anti-dripping agent. wherein the polycarbonate is present in the composition in an amount of at least about 85 weight percent, wherein the phosphoric acid ester is present at a level which is within the range of about 1 weight percent to about 12 weight percent, wherein the functionalized acrylic polymer is present at a level which is within the range of about 0.5 weight percent to about 4.5 weight percent, and wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of about 0.5 weight percent to about 4.5 weight percent, with the proviso that the sum of the amount of the functionalized acrylic acid polymer and the alkyl methacrylate-diene-vinyl aromatic terpolymer present in the composition does not total more than 5 weight percent.
2. A flame retardant polycarbonate composition as specified in claim 1 wherein the functionalized acrylic polymer is comprised of repeat units that are derived from ethylene, methylmethacrylate, and glycidyl methacrylate.
3. A flame retardant polycarbonate composition as specified in claim 2 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is comprised of repeat units that are derived from 1,3-butadiene, styrene, and methyl methacrylate.
4. A flame retardant polycarbonate composition as specified in claim 3 wherein the phosphoric acid ester is present at a level which is within the range of 2 weight percent to 10 weight percent.
5. A flame retardant polycarbonate composition as specified in claim 4 wherein the functionalized acrylic polymer is present at a level which is within the range of 1 weight percent to 2 weight percent.
6. A flame retardant polycarbonate composition as specified in claim 4 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of 2 weight percent to 3 weight percent.
7. A flame retardant polycarbonate composition as specified in claim 1 wherein the functionalized acrylic polymer and the alkyl methacrylate-diene-vinyl aromatic terpolymer are dispersed into said composition under dynamic reaction conditions.
8. A flame retardant polycarbonate composition as specified in claim 3 wherein the phosphoric acid ester is present at a level which is within the range of 5 weight percent to 9 weight percent.
9. A flame retardant polycarbonate composition as specified in claim 3 wherein the flame retardant polycarbonate composition is comprised of an anti-dripping agent.
10. A flame retardant polycarbonate composition as specified in claim 1 wherein the phosphoric acid ester is aromatic phosphate oligomer.
11. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is bisphenol A diphenylphosphate.
12. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is resorcinol diphenylphosphate.
13. A flame retardant polycarbonate composition as specified in claim 10 wherein the aromatic phosphate oligomer is 1,3-phenylene-bis(dixylenyl phosphate).
14. A flame retardant polycarbonate composition as specified in claim 9 wherein the anti-dripping agent is present at a level within the range of 0.05 to 0.5 weight percent.
15. A flame retardant polycarbonate composition as specified in claim 9 wherein the anti-dripping agent is present at a level within the range of 0.1 to 0.3 weight percent.
16. A flame retardant polycarbonate composition as specified in claim 14 wherein the anti-dripping agent is poly(tetrafluoroethylene).
17. A flame retardant polycarbonate composition as specified in claim 1 wherein said composition is void of clay.
18. A flame retardant polycarbonate composition as specified in claim 2 wherein the repeat units which are derived from ethylene are present at a level which is within the range of 45 weight percent to 89 weight percent, wherein the repeat units which are derived from methylmethacrylate are present at a level which is within the range of 10 weight percent to 40 weight percent, and wherein the repeat units which are derived from glycidyl methacrylate are present at a level which is within the range of 1 weight percent to 15 weight percent.
19. A flame retardant polycarbonate composition as specified in claim 18 wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is a block copolymer which contains 5 to 25 weight percent styrene repeat units, 50 to 90 weight percent butadiene repeat units and 5 to 25 weight percent methylmethacrylate repeat units.
20. A flame retardant polycarbonate composition as specified in claim 19 wherein the phosphoric acid ester is present at a level which is within the range of 2 weight percent to 10 weight percent, wherein the functional ized acrylic polymer is present at a level which is within the range of 1 weight percent to 2 weight percent, wherein the alkyl methacrylate-diene-vinyl aromatic terpolymer is present at a level which is within the range of 2 weight percent to 3 weight percent, wherein the flame retardant polycarbonate composition is comprised of an anti-dripping agent, and wherein the anti-dripping agent is present at a level within the range of 0.05 to 0.5 weight percent.

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 actuator, comprising;
a housing; wherein the housing forms a supply port, a control port, and an exhaust port
a first poppet having a proximal end having a nipple extending therefrom, a distal end, and a poppet head therebetween, said first poppet slidably disposed within the housing;
a second poppet having a proximal end having a nipple extending therefrom, a distal end, and a poppet head therebetween, said second poppet slidably disposed within the housing adjacent to the first poppet, the second poppet being engageable with the first poppet and the first poppet being engageable with a seat of the housing to establish a fluid flow configuration, wherein the second poppet is identical to the first poppet, wherein the first poppet and the second poppet are movable between a de-energized configuration wherein flow is prohibited between the supply port and the control port, prohibited between the exhaust port and the supply port, and permitted between the control port and the exhaust port, plural partially energized configurations wherein flow is permitted between the supply port and the control port, between the control port and the exhaust port, and between the exhaust port and the supply port, and a fully energized configuration wherein flow is prohibited between the control port and the exhaust port and flow is permitted between the supply port and the control port;
a first poppet seat;
a second poppet seat, each poppet head being configured to engage both poppet seats.
2. The actuator of claim 1, wherein the distal end of each poppet forms a bore that is sized to receive the nipple.
3. The actuator of claim 2, wherein the nipple of the first poppet engages the bore of the second poppet.
4. The actuator of claim 3, wherein the poppet head of each poppet forms a first frusto-conical surface and a second frusto-conical surface.
5. The actuator of claim 4, wherein the first frusto-conical surface of each poppet is configured to engage the second poppet seat.
6. The actuator of claim 5, wherein the second frusto-conical surface of each poppet is configured to engage the first poppet seat.
7. A fluid control system, comprising:
a fluid supply;
a hydraulically controlled device;
a fluid exhaust; and
an actuator in fluid communication with the fluid supply, the hydraulically controlled device and the fluid exhaust, the actuator comprising:
a first poppet slidably disposed within the housing;
a second poppet slidably disposed within the housing adjacent to the first poppet, wherein the second poppet is identical to the first poppet;
a first poppet seat; and
a second poppet seat, each poppet being configured to engage both poppet seats, wherein each poppet comprises:
a proximal end, including a nipple extending therefrom;
a distal end; and
a poppet head therebetween, the poppet head being configured to engage the first poppet seat and the second poppet seat.
8. The fluid control system of claim 7, wherein the distal end of each poppet forms a bore that is sized to receive the nipple.
9. The fluid control system of claim 8, wherein the nipple of the first poppet engages the bore of the second poppet.
10. The fluid control system of claim 9, wherein the poppet head of each poppet forms a first frusto-conical surface and a second frusto-conical surface.
11. The fluid control system of claim 10, wherein the first frusto-conical surface of each poppet is configured to engage the second poppet seat.
12. The fluid control system of claim 11, wherein the second frusto-conical surface of each poppet is configured to engage the first poppet seat.