US4028252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accordion fold flat plate dialyzer
Assignee: Extracorporeal Medical Specialties Inc
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Filing: 1975-06-04
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Granted: 1977-06-07
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Expires: 1995-06-04
Abstract
Abstract A support material is fed through mating elements which emboss transverse score lines thereon to form an accordion fold in the material. A single thickness of the folded support material is then interleaved with a permeable membrane and sealed in a housing to form a compact inexpensive flat plate dialyzer. Longitudinal channels are formed in the support material which materially improve distribution of fluids within the dialyzer.
Inventors
- 👤 Livingston B. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:41
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/28; B01D63/00; B01D63/14; B01D2313/00; B01D2313/04; B01D2313/041; B01D2313/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A flat plate dialyzer comprising a housing having separate inlets and outlets therein for blood and dialysate, a single continuous layer of flexible, nonwoven support material, said support material accordian folded along transverse score lines formed in the support material, a pattern on at least one side of said support material being oriented substantially perpendicular to the score lines whereby compaction of the support material is obtained by interdigitation of the pattern when accordian folded upon itself, a continuous layer of permeable membrane material placed within the accordian folds on one side of the support material to form a pleated stack and sealed in said housing to form separate flow paths for blood and dialysate on opposite sides of said membrane.
Claim 2
Dependent Claim
121 words
A flat plate dialyzer comprising a housing having separate inlets and outlets therein for blood and dialysate, a single continuous layer of flexible, nonwoven support material, said support material accordian folded along transverse score lines formed in the support material, a pattern on at least one side of said support material being oriented substantially perpendicular to the score lines whereby compaction of the support material is obtained by interdigitation of the pattern when accordian folded upon itself, a continuous layer of permeable membrane material placed within the accordian folds on one side of the support material to form a pleated stack and sealed in said housing to form separate flow paths for blood and dialysate on opposite sides of said membrane.
Claim 3
Dependent Claim
16 words
The flat plate dialyzer of claim 1 wherein the support material has longitudinal channels formed therein.
Claim 4
Dependent Claim
28 words
The flat plate dialyzer of claim 2, wherein said channels are aligned with the inlets and outlets in said housing to promote distribution of fluids within said housing.
Claim 5
Dependent Claim
20 words
The flat plate dialyzer of claim 2 wherein the channels in the support material are thinner than the support material.
Claim 6
Dependent Claim
41 words
The flat plate dialyzer of claim 1 wherein a biocompatable material is placed between the housing and pleated stack in an area between at least one of the inlets and outlets to prevent shunting of fluids between the inlet and outlet.
Claim 7
Dependent Claim
24 words
The flat plate dialyzer of claim 5 wherein the housing contains internal dams to prevent the biocompatible material from blocking the inlets or outlets.
Claim 8
Dependent Claim
16 words
The flat plate dialyzer of claim 1 wherein the housing comprises at least two mating parts.
Claim 9
Dependent Claim
28 words
The flat plate dialyzer of claim 7 wherein at least two edges of the permeable membrane are sealed between abutting portions of the mating parts of said housing.
Claim 10
Dependent Claim
31 words
The flat plate dialyzer of claim 8 wherein the other two edges of the permeable membrane are sealed in a biocompatible sealing material centrifugally cast in the ends of the housing.
Claim 11
Dependent Claim
51 words
The flat plate dialyzer of claim 8 wherein a compressible, strip sealing material is placed in a groove in one of the mating housing parts, two edges of the permeable membrane being sealed in the housing between the strip sealing material and the abutting edge of the other mating housing part.
Claim 12
Independent Claim
159 words
A method of making a flat plate dialyzer comprising the steps of passing a continuous layer of flexible, non woven support material between mating elements to form transverse score lines therein and impart an accordian fold thereto, placing permeable membrane on one side of said scored support material, folding the support material along the score lines with the permeable membrane in place to form a pleated stack, placing the pleated stack in one of two mating housing parts, sealing at least two edges of the permeable membrane within said housing by compressing said edges between abutting portions of the mating housing parts, at least one of said abutting portions of the housing parts having a strip sealing material therein, sealing the remaining edges of the permeable membrane within the housing and securing the mating housing parts to each other at a location other than that at which the permeable membrane is sealed between abutting portions of the housing parts.
Claim 13
Independent Claim
159 words
A method of making a flat plate dialyzer comprising the steps of passing a continuous layer of flexible, non woven support material between mating elements to form transverse score lines therein and impart an accordian fold thereto, placing permeable membrane on one side of said scored support material, folding the support material along the score lines with the permeable membrane in place to form a pleated stack, placing the pleated stack in one of two mating housing parts, sealing at least two edges of the permeable membrane within said housing by compressing said edges between abutting portions of the mating housing parts, at least one of said abutting portions of the housing parts having a strip sealing material therein, sealing the remaining edges of the permeable membrane within the housing and securing the mating housing parts to each other at a location other than that at which the permeable membrane is sealed between abutting portions of the housing parts.
Claim 14
Dependent Claim
19 words
The method of making a flat plate dialyzer according to claim 11 wherein the mating elements are heated rolls.
Claim 15
Dependent Claim
18 words
The method of making a flat plate dialyzer according to claim 11 wherein the mating elements are platens.
Claim 16
Dependent Claim
23 words
The method of making a flat plate dialyzer according to claim 11 wherein the mating elements form longitudinal channels in the support material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |