US4515591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable syringe cartridge for fluid delivery apparatus
Assignee: CareFusion 303 Inc
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Filing: 1982-09-28
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Granted: 1985-05-07
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Expires: 2002-09-28
Abstract
Abstract A disposable syringe cartridge including a molded plastic cylinder having an open end and a closed end with inlet and outlet nipples integrally formed in the closed end, and a plastic piston head slidably received in the open end of the cylinder and pivotably connected to a plastic piston rod. The piston head utilizes a quad-type sealing ring providing a pair of adjacent sealing surfaces with the cylinder, and includes a square expansion flange rounded at each of its corners to conform in shape to the cylinder, with a rubber annular sealing boot extending between the open end of the syringe cylinder and the piston rod. A flange formed on the outer circumferential edge of the sealing boot is received over the open end of the cylinder and is captured by an annular cap that is ultrasonically welded to the cylinder, while a bead formed on the inner circumferential edge of the sealing boot is received in a groove defined by a pair of adjacent annular flanges formed on the piston rod. In an alternative embodiment, the piston head has two sealing rings, each carried adjacent an opposite end of the piston head, so that the sealing boot can be eliminated.
Inventors
- 👤 Karl J. Hemmerich
- 👤 Donald L. Millerd
- 👤 Anthony B. Semedo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:04
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14212; A61M5/14216
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
126 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing ring disposed around said piston head for forming a circumferential sealing relationship with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; and means for engaging the other end of said piston rod to the mounting means of a piston drive system.
Claim 2
Dependent Claim
126 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing ring disposed around said piston head for forming a circumferential sealing relationship with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; and means for engaging the other end of said piston rod to the mounting means of a piston drive system.
Claim 3
Dependent Claim
82 words
Apparatus as set forth in claim 1, and further including an annular sealing boot formed of a flexible and fluid impervious material, the outer circumferential edge of said boot affixed to said open end of said cylinder, and the inner circumferential edge of said boot affixed to said piston rod, said sealing boot having sufficient material between its outer and inner circumferential edges to seal said open end of said cylinder without stretching at any time during reciprocation of said piston head.
Claim 4
Dependent Claim
50 words
Apparatus as set forth in claim 2, and further including: an annular cap received over and bonded to said open end of said cylinder with said outer circumferential edge of said boot captured between said annular cap and said open end of said cylinder to secure said boot in place.
Claim 5
Dependent Claim
32 words
Apparatus as set forth in claim 2, wherein said piston rod further includes a pair of parallel spaced-apart integral annular flanges between which said inner circumferential edge of said boot is received.
Claim 6
Dependent Claim
47 words
Apparatus as set forth in claim 1, wherein said sealing ring disposed around the circumference of said piston head comprises a quad sealing ring having a substantially X-shaped radial cross-section such that said sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder.
Claim 7
Dependent Claim
69 words
Apparatus as set forth in claim 1, wherein said piston head and said piston rod are formed as separate parts, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral hook depending from said piston head and an integral wrist pin formed in said one end of said piston rod, said wrist pin receivable in said hook with a snap fit.
Claim 8
Dependent Claim
47 words
Apparatus as set forth in claim 1, wherein said piston head and said piston rod are integrally formed as a unitary structure, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral connecting member having at least limited flexibility.
Claim 9
Dependent Claim
39 words
Apparatus as set forth in claim 7, wherein said piston head, said piston rod and said integral connecting member are molded plastic, and further wherein said integral connecting member includes a relatively thin portion imparting flexibility to said member.
Claim 10
Dependent Claim
19 words
Apparatus as set forth in claim 1, and further including: an I.V. tube solvent-bonded to each of said nipples.
Claim 11
Dependent Claim
159 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing ring disposed about the circumference of said piston head for forming a circumferential sealing relationship with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; means for engaging the other end of said piston rod to the mounting means of a piston drive system; and means for forming a flexible seal between the open end of said cylinder and said piston rod to seal said cylinder at all times during reciprocation of said piston head.
Claim 12
Dependent Claim
159 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing ring disposed about the circumference of said piston head for forming a circumferential sealing relationship with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; means for engaging the other end of said piston rod to the mounting means of a piston drive system; and means for forming a flexible seal between the open end of said cylinder and said piston rod to seal said cylinder at all times during reciprocation of said piston head.
Claim 13
Dependent Claim
55 words
Apparatus as set forth in claim 10, wherein the opposite ends of said piston head are defined respectively by a piston face and a substantially square expansion flange that is spaced from and parallel to said piston face, the four corners of said piston face being rounded for conformance with the shape of said cylinder.
Claim 14
Dependent Claim
47 words
Apparatus as set forth in claim 10, wherein said sealing ring disposed about the circumference of said piston head comprises a quad sealing ring having a substantially X-shaped radial cross-section such that said sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder.
Claim 15
Dependent Claim
27 words
Apparatus as set forth in claim 12, wherein said piston head has a pair of parallel spaced-apart integral annular flanges between which said sealing ring is disposed.
Claim 16
Dependent Claim
69 words
Apparatus as set forth in claim 10, wherein said piston head and said piston rod are formed as separate parts, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral hook depending from said piston head and an integral wrist pin formed in said one end of said piston rod, said wrist pin receivable in said hook with a snap fit.
Claim 17
Dependent Claim
47 words
Apparatus as set forth in claim 10, wherein said piston head and said piston rod are integrally formed as a unitary structure, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral connecting member having at least limited flexibility.
Claim 18
Dependent Claim
39 words
Apparatus as set forth in claim 15, wherein said piston head, said piston rod and said integral connecting member are molded plastic, and further wherein said integral connecting member includes a relatively thin portion imparting flexibility to said member.
Claim 19
Dependent Claim
19 words
Apparatus as set forth in claim 10, and further including: an I.V. tube solvent-bonded to each of said nipples.
Claim 20
Dependent Claim
233 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a quad sealing ring disposed about the circumference of said piston head for forming a circumferential sealing relationship with said cylinder, said quad sealing ring having a substantially X-shaped radial cross-section such that said sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; means for pivotally engaging the other end of said piston rod to the mounting means of a piston drive system; and an annular sealing boot formed of a flexible and fluid impervious material, the outer circumferential edge of said boot received over and affixed to said open end of said cylinder, and the inner circumferential edge of said boot affixed to said piston rod, said sealing boot having sufficient material between its outer and inner circumferential edges to seal said open end of said cylinder without stretching at any time during reciprocation of said piston head.
Claim 21
Dependent Claim
233 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a quad sealing ring disposed about the circumference of said piston head for forming a circumferential sealing relationship with said cylinder, said quad sealing ring having a substantially X-shaped radial cross-section such that said sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; means for pivotally engaging the other end of said piston rod to the mounting means of a piston drive system; and an annular sealing boot formed of a flexible and fluid impervious material, the outer circumferential edge of said boot received over and affixed to said open end of said cylinder, and the inner circumferential edge of said boot affixed to said piston rod, said sealing boot having sufficient material between its outer and inner circumferential edges to seal said open end of said cylinder without stretching at any time during reciprocation of said piston head.
Claim 22
Dependent Claim
50 words
Apparatus as set forth in claim 18, and further including: an annular cap received over and bonded to said open end of said cylinder with said outer circumferential edge of said boot captured between said annular cap and said open end of said cylinder to secure said boot in place.
Claim 23
Dependent Claim
32 words
Apparatus as set forth in claim 19, wherein said piston rod further includes a pair of parallel spaced-apart integral annular flanges between which said inner circumferential edge of said boot is received.
Claim 24
Dependent Claim
55 words
Apparatus as set forth in claim 18, wherein the opposite ends of said piston head are defined respectively by a piston face and a substantially square expansion flange that is spaced from and parallel to said piston face, the four corners of said expansion flange being rounded for conformance with the shape of said cylinder.
Claim 25
Dependent Claim
28 words
Apparatus as set forth in claim 21, wherein said piston head further includes a pair of parallel spaced-apart integral annular flanges between which said sealing ring is disposed.
Claim 26
Dependent Claim
69 words
Apparatus as set forth in claim 18, wherein said piston head and said piston rod are formed as separate parts, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral hook depending from said piston head and an integral wrist pin formed in said one end of said piston rod, said wrist pin receivable in said hook with a snap fit.
Claim 27
Dependent Claim
47 words
Apparatus as set forth in claim 18, wherein said piston head and said piston rod are integrally formed as a unitary structure, and further wherein said means for pivotally connecting said piston rod to said piston head comprises an integral connecting member having at least limited flexibility.
Claim 28
Dependent Claim
37 words
Apparatus as set forth in claim 24, wherein said piston head, said piston rod and said integral connecting member are molded plastic, and said integral connecting member includes a relatively thin portion imparting flexibility to said member.
Claim 29
Dependent Claim
19 words
Apparatus as set forth in claim 18, and further including: an I.V. tube solvent-bonded to each of said nipples.
Claim 30
Dependent Claim
149 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing means disposed around the circumference of the piston head comprising a quad sealing ring having a substantially X-shaped radial cross section such that the sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; and means for engaging the other end of said piston rod to the mounting means of a piston drive system.
Claim 31
Dependent Claim
149 words
For use in a syringe pump, a disposable plastic syringe cartridge, comprising: a hollow cylinder having an open end and a closed end, said cylinder having a pair of inlet and outlet nipples projecting from said closed end of said cylinder, each of said nipples adapted for connection to an I.V. tube; a piston head slidably received within said cylinder; a sealing means disposed around the circumference of the piston head comprising a quad sealing ring having a substantially X-shaped radial cross section such that the sealing ring has a pair of adjacent surfaces in sealing contact with said cylinder; a piston rod for reciprocating said piston head along the longitudinal axis of said cylinder; means for pivotally connecting one end of said piston rod to said piston head; and means for engaging the other end of said piston rod to the mounting means of a piston drive system.
References Cited (Backward Citations)
US2764981A
Cited
DE1192787B
Cited
US3934586A
Cited
US3993061A
Cited
US4363329A
Cited
US4396385A
Cited
US4399778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |