Patent US5897528A successfully refreshed from Google Patents.
US5897528A
Expired / Lapsed
US
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Filtered intracerebroventricular or intraspinal access port with direct cerebrospinal fluid access
Assignee: Medtronic Inc
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Filing: 1998-04-30
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Granted: 1999-04-27
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Expires: 2018-04-30
Abstract
Abstract An access port and method of use is described that has a filter assembly along a fluid flow path through the access port. The access port is in fluid communication with a catheter that is surgically implanted in a patient's brain or intraspinal space. The filter assembly has a filter element and a series of one-way valves. The one-way valves allow the fluid to flow easily across the filter assembly in one direction but prohibit fluid flow through the one-way valves in the opposite direction. The one-way valves are oriented to allow fluid flow from the catheter to a chamber within the access port which can be accessed by a needle. Drug or other medication to be administered to the patient through a needle must pass through the filter before entering catheter to be ultimately administered to the patient.
Inventors
- 👤 Brenda Kay Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:37
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; A61M39/00; A61M39/02; A61M39/0208; A61M2039/0241
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
208 words
A method of withdrawing unfiltered cerebrospinal fluid from a patient comprising the steps of: placing a catheter in the patient's ventricle; placing an access port cranially, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid commnunication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; allowing cerebrospinal fluid to move through the catheter into the lower filter chamber, through the one-way valve into the upper filter chamber and the upper cavity whereby unfiltered cerebrospinal fluid is introduced into the upper cavity; placing a needle attached to a syringe through the septum into the upper cavity; drawing unfiltered cerebrospinal fluid through the needle.
Claim 2
Independent Claim
208 words
A method of withdrawing unfiltered cerebrospinal fluid from a patient comprising the steps of: placing a catheter in the patient's ventricle; placing an access port cranially, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid commnunication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; allowing cerebrospinal fluid to move through the catheter into the lower filter chamber, through the one-way valve into the upper filter chamber and the upper cavity whereby unfiltered cerebrospinal fluid is introduced into the upper cavity; placing a needle attached to a syringe through the septum into the upper cavity; drawing unfiltered cerebrospinal fluid through the needle.
Claim 3
Independent Claim
202 words
A method of administering fluid to the ventricle of a patient comprising the steps of: placing a catheter in the patient's ventricle; placing an access port cranially, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; placing a needle attached to a syringe through the septum into the upper cavity; administering the fluid from the needle into the upper cavity wherein the fluid passes into the upper filter chamber, across the filter part, into the lower filter chamber, through the port and into the patient's ventricle.
Claim 4
Independent Claim
202 words
A method of administering fluid to the ventricle of a patient comprising the steps of: placing a catheter in the patient's ventricle; placing an access port cranially, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; placing a needle attached to a syringe through the septum into the upper cavity; administering the fluid from the needle into the upper cavity wherein the fluid passes into the upper filter chamber, across the filter part, into the lower filter chamber, through the port and into the patient's ventricle.
Claim 5
Independent Claim
213 words
A method of withdrawing unfiltered cerebrospinal fluid from a patient comprising the steps of: placing a catheter in the patient's intraspinal space; placing an access port over the patient's rib cage, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; allowing cerebrospinal fluid to move through the catheter into the lower filter chamber, through the one-way valve into the upper filter chamber and the upper cavity whereby unfiltered cerebrospinal fluid is introduced into the upper cavity; placing a needle attached to a syringe through the septum into the upper cavity; drawing unfiltered cerebrospinal fluid through the needle.
Claim 6
Independent Claim
213 words
A method of withdrawing unfiltered cerebrospinal fluid from a patient comprising the steps of: placing a catheter in the patient's intraspinal space; placing an access port over the patient's rib cage, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; allowing cerebrospinal fluid to move through the catheter into the lower filter chamber, through the one-way valve into the upper filter chamber and the upper cavity whereby unfiltered cerebrospinal fluid is introduced into the upper cavity; placing a needle attached to a syringe through the septum into the upper cavity; drawing unfiltered cerebrospinal fluid through the needle.
Claim 7
Independent Claim
209 words
A method of administering fluid to the ventricle of a patient comprising the steps of: placing a catheter in the patient's intraspinal space; placing an access port over the patient's rib cage, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; placing a needle attached to a syringe through the septum into the upper cavity; administering the fluid from the needle into the upper cavity wherein the fluid passes into the upper filter chamber, across the filter part, into the lower filter chamber, through the outlet port and catheter into the patient's ventricle.
Claim 8
Independent Claim
209 words
A method of administering fluid to the ventricle of a patient comprising the steps of: placing a catheter in the patient's intraspinal space; placing an access port over the patient's rib cage, the access port having: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber; connecting said catheter to said outlet port; placing a needle attached to a syringe through the septum into the upper cavity; administering the fluid from the needle into the upper cavity wherein the fluid passes into the upper filter chamber, across the filter part, into the lower filter chamber, through the outlet port and catheter into the patient's ventricle.
Claim 9
Dependent Claim
118 words
An access port comprising: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber.
Claim 10
Dependent Claim
118 words
An access port comprising: a housing having an upper surface, an upper cavity and a lower cavity, the upper cavity extending from the upper surface of housing into the housing and terminating at the lower cavity; a septum located in the upper cavity; a filter assembly extending entirely across the lower cavity separating the lower cavity into an upper filter chamber in fluid communication with the upper cavity and a lower filter chamber, the filter assembly having a filter part and at least one one-way valve, the one way valve oriented to allow fluid to pass only from the lower filter chamber to the upper filter chamber; an outlet port in fluid communication with the lower filter chamber.
Claim 11
Dependent Claim
23 words
The access port of claim 5 wherein the upper cavity has a middle cavity located between the upper surface and the lower cavity.
Claim 12
Dependent Claim
13 words
The access port of claim 5 wherein the upper cavity is generally cylindrical.
Claim 13
Dependent Claim
13 words
The access port of claim 5 wherein the lower cavity is generally cylindrical.
Claim 14
Dependent Claim
13 words
The access port of claim 5 wherein the housing is generally disk shaped.
Claim 15
Dependent Claim
17 words
The access port of claim 5 wherein the filter has a pore size of about 0.22 micron.
Claim 16
Dependent Claim
14 words
The access port of claim 5 wherein the one-way valve is a miter valve.
Claim 17
Dependent Claim
14 words
The access port of claim 5 wherein the one-way valve is a slit valve.
Claim 18
Dependent Claim
16 words
The access port of claim 5 wherein the filter assembly includes at least two one-way valves.
Claim 19
Dependent Claim
19 words
The access port of claim 13 wherein the at least two one-way valves are dispersed over the filter assembly.
Claim 20
Dependent Claim
19 words
The access port of claim 5 further comprising a passage connecting the lower filter chamber to the out port.
Claim 21
Dependent Claim
17 words
The access port of claim 5 further comprising at least one suture loop attached to said housing.
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) | 2002-04-26 | 2002-10-26 | 2003-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-26 | 2006-10-26 | 2007-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-26 | 2010-10-26 | 2011-04-27 | $7700.00 | Window Closed / Lapsed |