Patent EP0172586A1 successfully refreshed from Google Patents.
EP0172586A1
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EP
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Medical infusor
Assignee: Alza Corp
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Filing: 1981-01-08
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Granted: —
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Expires: 2001-01-08
Abstract
Abstract A portable elastomeric bladder-powered infusor for dispensing drug in liquid form under pressure at a predetermined flow rate is disclosed. The main elements of the infusor are a tubular housing (12) a plug/flow control assembly (13) fixed in one end of the bladder, an axially slidable pistonlfilling port assembly (14) within the housing. and a tubular bladder (15). The plug and piston assemblies each has an axial post (22.44) about which the bladder ends are attached. When the bladder is not charged with drug, the posts fill the bladder's lumen and their ends abut. Drug is charged to the infusor by inserting a drug-filled syringe into the open end of the housing with the syringe's needle entering an axial bore (47) in the piston, penetrating a septum (48) that blocks the bore, and extending into the axial post. The force exerted on the piston by the syringe is transmitted to the fixed plug assembly via the axial posts. Drug is expelled from the syringe causing the posts to separate and the bladder to expand axially and radially. Once the bladder is filled, the syringe is withdrawn, with the septum sealing itself. The drug is dispensed from the bladder via the plug/flow control assembly and a conduit that is connected to that assembly and extends to the infusion site.
Inventors
- 👤 John R. Peery
- 👤 Peter F. Carpenter
- 👤 William K. Griesinger
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:36
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/141; A61M5/142; A61M5/145; A61M5/148; A61M5/152; A61M5/50; Y; Y10; Y10S; Y10S128/00; Y10S128/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
An elastomeric bladder assembly for dispensing a liquid under pressure comprising a tubular housing (12), a plug (13) fixed in one end of the housing having an aperture extending therethrough, an axially slidable piston (14) within the housing, a tubular elastomeric bladder (15) for receiving and holding the liquid under pressure via a septum or one way sealing valve (48), the ends of said bladder being sealingly attached to the plug and piston, respectively, with the lumen of the bladder communicating with the aperture in the plug, said assembly being adapted for operative connection to a conduit (17) extending from the aperture in the plug to an infusion site and a flow regulator (27) in the fluid path up stream of said conduit (17) for permitting the liquid to flow from the bladder to the infusion site at a predetermined flow rate; characterized in that there is at least one axial post (44:22.73) within the lumen of the bladder (15) said at least one post having axial aperture (25.47) and being capable of extending when the bladder is deflated between the inner side of the piston (14) and the inner side of the plug (13), thereby to substantially fill the lumen and allow complete discharge of the liquid from the bladder.
Claim 2
Dependent Claim
211 words
An elastomeric bladder assembly for dispensing a liquid under pressure comprising a tubular housing (12), a plug (13) fixed in one end of the housing having an aperture extending therethrough, an axially slidable piston (14) within the housing, a tubular elastomeric bladder (15) for receiving and holding the liquid under pressure via a septum or one way sealing valve (48), the ends of said bladder being sealingly attached to the plug and piston, respectively, with the lumen of the bladder communicating with the aperture in the plug, said assembly being adapted for operative connection to a conduit (17) extending from the aperture in the plug to an infusion site and a flow regulator (27) in the fluid path up stream of said conduit (17) for permitting the liquid to flow from the bladder to the infusion site at a predetermined flow rate; characterized in that there is at least one axial post (44:22.73) within the lumen of the bladder (15) said at least one post having axial aperture (25.47) and being capable of extending when the bladder is deflated between the inner side of the piston (14) and the inner side of the plug (13), thereby to substantially fill the lumen and allow complete discharge of the liquid from the bladder.
Claim 3
Dependent Claim
24 words
The elastomeric bladder of claim 1 characterised in that two axially aligned post(s) (44.22.73) are connected to said opposed ends of said bladder (15).
Claim 4
Dependent Claim
39 words
The elastomeric bladder assembly of either preceding claim characterised in that means are provided for maintaining the axial alignment of said post(s) (44.22.73) when said bladder (15) returns to a deflated condition after discharge of its fluid contents (58).
Claim 5
Dependent Claim
41 words
The elastomeric bladder assembly of any preceding claim characterised in that a flow regulator (27) for controlling the release of fluid from said bladder assembly (15) in fluid communication with the lumen of said bladder is positioned within the bladder assembly.
Claim 6
Dependent Claim
49 words
An elastomeric bladder assembly of any one of the foregoing claims characterised in that the post (44) received in the end of the bladder having the septum means (48) is provided with an air outlet port (64) intermediate the septum (48) and the remote end of the post (44).
Claim 7
Dependent Claim
144 words
A medical infusor comprising an elastomeric bladder assembly according to claim 1 characterised in that the piston (14) is slidable in said housing and the plug (13) is fixedly mounted in said housing, each of said piston (14) and plug (13) being provided with a respective dependent post (44.22) aligned axially with said housing, and fluid (58) is sealingly received within the opposite ends of said elastomeric bladder, the combined length of said dependent post(s) (44.22) with their adjacent ends in abutting relationship being sufficient to substantially fill the lumen of said tublular bladder in its deflated condition while otherwise offering substantially no resistance to inflation and deflation of said elastomeric bladder, the post (44) received in the end of the bladder having the septum (48) being provided with a bore (47) providing fluid communication between the lumen of said bladder and said septum.
Claim 8
Dependent Claim
52 words
A medical infusor comprising an elastomeric bladder assembly of any one of claims 1 to 5 characterised in that at least a portion of said housing (12) is transparent whereby observation of the location of the piston (14) provides a visual indication of the amount of fluid (58) in said bladder (15).
Claim 9
Dependent Claim
27 words
A medical infusor according to claim 7 characterised in that said housing (12) is provided with indicia (18) overlaying the path of motion of said piston (14).
Claim 10
Dependent Claim
19 words
A medical infusor assembly including an elastomeric bladder assembly according to any one of the claims 1 to 5.
References Cited (Backward Citations)
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