Infusion device
First Claim
1. A power module for a drug infusion device comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
- adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being of constant volume and being under partial vacuum and said first chamber containing a vacumm-stable viscous fluid therein;
whereby, as said viscous fluid flows from said first chamber into said constant volume second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position; and
means for connecting said piston to a sryinge module for operating said syringe module as said piston advances from extended to retracted positions.
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Accused Products
Abstract
An infusion device for dispensing drugs and other fluids at controlled rates over extended time periods. The device includes a syringe section and a power section that are connected together in use, the power section having a casing defining a first chamber containing a vacuum-stable viscous liquid and a second chamber under partial vacuum. A metering passage extends between the two chambers, and a piston is slidably received in the casing and constitutes a movable wall of the first chamber so that as the viscous liquid gradually flows through the metering passage into the second chamber the piston retracts slowly to cause fluid to be discharged from the syringe.
103 Citations
36 Claims
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1. A power module for a drug infusion device comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
- adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being of constant volume and being under partial vacuum and said first chamber containing a vacumm-stable viscous fluid therein;
whereby, as said viscous fluid flows from said first chamber into said constant volume second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position; and
means for connecting said piston to a sryinge module for operating said syringe module as said piston advances from extended to retracted positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- adjustable valve means for opening and closing said passage;
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12. A power module for a drug infusion devision comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
- adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
means for connecting said piston to a syringe module for operating said syringe module as said piston advances from extended to retracted positions;
said casing having concentric cylindrical inner and outer walls;
said second chamber being disposed within said inner wall and said first chamber being disposed between said inner and outer walls;
said metering flow passage comprising an opening in said inner wall;
said valve means comprising a valve member movably mounted in said casing for controlling flow through said opening. - View Dependent Claims (13, 14, 15, 16)
- adjustable valve means for opening and closing said passage;
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17. A power module for a drug infusion device comprising a casing having a first chamber and a secodn chamber and having a metering flow pasage therebetween;
- adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
means for connecting said piston to a syringe module for operating said syringe module as said piston advances from extended to retracted positions;
said casing having concentric cylindrical inner and outer walls with said first chamber being disposed between said inner and outer walls and said second chamber being disposed within said inner wall;
said piston being annular and slidably engaging opposing surfaces of said inner and outer walls; and
detachable means temporarily joining said annular piston and casing for preventing rotation of said annular piston within said first chamber until said means is detached;
said annular piston having an outer surface portion extending beyond said outer wall;
sad means for preventing rotation of said annular piston comrpising a band of tape adhesively and removably engaging both the outer surface of said outer wall and said surface portion of said annular piston.
- adjustable valve means for opening and closing said passage;
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18. A drug infusion device having a power section and a syringe section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being of constant volume and under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said constant volume second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom; and
means for operatively connecting said power and syringe sections to that retraction of said piston causes advancement of said syringe plunger. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
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26. A drug infusion device having a power section and a syringe section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebeween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said power and syringe sections constituting separate modules and said means for connecting said sections comprising interfitting portions of said sections;
said interfitting portions including lugs provided by one of said sections and lug-receiving slots provided by the other of said sections. - View Dependent Claims (27, 28)
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebeween;
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29. A drug infusion device having a power section and a syring section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said power and syringe sections constituting separate modules;
said means for connecting said sections comprising interfitting portions of said sections;
said power unit including a portion of said casing that engages the plunger of said syringe, and advances said plunger a limited distance to discharge a bolus of drug from said barrel, as said sections are connected together.
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
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30. A drug infusion device having a power section and a syring section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said power and syringe sections constituting separate modules; and
means for connecting said sections comprising interfitting portions of said sections;
said syringe section being provided with a piercable membrane within said barrel adjacent said outlet; and
a hollow needle within said barrel having a lumen communicating with said outlet and having a pointed tip for piercing said membrane as said plunger is advanced within said barrel;
said power unit including a portion of said casing that engages the plunger of said syringe, and advances said plunger a limited distance to cause piercing of said membrane by a needle and a discharging of a bolus of drug from said barrel, as said sections are conected together.
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
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31. A drug infusion device having a power section and a syringe section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said casing having concentric inner and outer walls;
said second chamber being disposed within said inner wall and said first chamber being disposed between said inner and outer wals;
said piston being annular and slidably engaging opposing surfaces of said inner and outer walls;
said metering passage comprising an opening in said inner wall;
said valve means comprising a valve member movably mounted in said casing for controlling flow through said opening. - View Dependent Claims (32, 33)
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
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34. A drug infusion device having a power section and a syringe section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow paassage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacuum-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said casing having concentric inner and outer walls;
said second chamber being disposed within said inner wall and said first chamber being disposed between said inner and outer walls;
said piston being annular and slidably engaging opposing surfaces of said inner and outer walls;
said valve means comprising a closure member rotatably received in said inner chamber and forming an end wall for said chamber;
said opening in said inner wall being in the form of an elongated slot extending in the direction of rotation of said closure member. - View Dependent Claims (35)
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow paassage therebetween;
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36. A drug infusion device having a power section and a syringe section;
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
adjustable valve means for opening and closing said passage;
a piston slidably received in said casing and constituting a movable wall of said first chamber;
said second chamber being under partial vacuum and said first chamber containing a vacumm-stable viscous fluid therein;
whereby, as said viscous fluid flows through said passage from said first chamber into said second chamber in response to said vacuum, said piston progressively slides in said casing from an extended position into a retracted position;
said syringe section including a barrel for containing a liquid drug to be infused, an outlet for discharge of said drug from said barrel, and a plunger slidably received within said barrel and capable of being advanced within said barrel to displace drug therefrom;
means for operatively connecting said power and syringe sections so that retraction of said piston causes advancement of said syringe plunger;
said casing having concentric cylindrical inner and outer walls with said first chamber being disposed between said inner and outer walls and said second chamber being disposed within said inner wall;
said piston being annular and slidably engaging opposing surfaces of said inner and outer walls;
detachable means temporarily joining said annular piston and casing for preventing rotation of said annular piston within said first chamber until said means is detached;
said annular piston having an outer surface portion extending beyond said outer wall;
said means for preventing rotation of said annular piston comprising a band of tape adhesively and removably engaging both the outer surface of said outer wall and said surface portion of said annular piston.
- said power section comprising a casing having a first chamber and a second chamber and having a metering flow passage therebetween;
Specification