Catheter malfunction determinations using physiologic pressure
First Claim
1. A method of identifying the presence of a catheter malfunction in an implanted catheter, the method comprising:
- measuring pressure of a fluid located within a lumen in a catheter implanted in a patient, wherein the lumen extends to an infusion section that is located at a selected internal delivery site in the patient;
developing a pressure modulation profile based on the measured pressure of the fluid in the lumen; and
comparing the pressure modulation profile to a selected pressure profile.
1 Assignment
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Accused Products
Abstract
Methods and systems for determining whether an implanted catheter used to deliver fluids to a selected internal delivery site is malfunctioning. The malfunctions may include that the infusion section of the catheter is not located at or has migrated away from the selected internal delivery site, is leaking, is blocked, etc. The determination is made by analyzing the pressure modulation of fluid within the catheter and determining whether the pressure of the fluid in the catheter is modulated by physiologic pressure changes experienced at the selected internal delivery site. The physiologic pressure modulations at the selected internal delivery site may be caused by, e.g., cardiac activity, respiration, changes in patient'"'"'s posture, etc.
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Citations
38 Claims
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1. A method of identifying the presence of a catheter malfunction in an implanted catheter, the method comprising:
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measuring pressure of a fluid located within a lumen in a catheter implanted in a patient, wherein the lumen extends to an infusion section that is located at a selected internal delivery site in the patient; developing a pressure modulation profile based on the measured pressure of the fluid in the lumen; and comparing the pressure modulation profile to a selected pressure profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of identifying the presence of a catheter malfunction in an implanted catheter, the method comprising:
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measuring fluid pressure of a fluid located within a lumen in a catheter implanted in a patient, wherein the lumen extends to an infusion section that is located at a selected internal delivery site in the patient; developing a pressure modulation profile based on the measured fluid pressure of the fluid in the lumen; and determining if the pressure modulation profile includes pressure modulation caused by patient cardiac activity. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of identifying the presence of a catheter malfunction in an implanted catheter, the method comprising:
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measuring fluid pressure of a fluid located within a lumen in a catheter implanted in a patient, wherein the lumen extends to an infusion section that is located at a selected internal delivery site in the patient; developing a pressure modulation profile based on the measured fluid pressure of the fluid in the lumen; and determining if the pressure modulation profile includes pressure modulation caused by patient respiration. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. An implantable infusion system comprising:
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a pump mechanism fluidly coupled to a reservoir to receive fluid contained within the reservoir; a catheter comprising a delivery lumen fluidly coupled to the pump mechanism, wherein the delivery lumen extends to an implantable infusion section in the catheter; a pressure sensor positioned to monitor fluid pressure within the delivery lumen of the catheter and provide a pressure signal representative of the fluid pressure; and control electronics connected to receive the pressure signal from the pressure sensor, wherein the control electronics further; develops a pressure modulation profile based on the fluid pressure measured in the delivery lumen; and compares the pressure modulation profile to a selected pressure profile. - View Dependent Claims (34)
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35. An implantable infusion system comprising:
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a pump mechanism fluidly coupled to a reservoir to receive fluid contained within the reservoir; a catheter comprising a delivery lumen fluidly coupled to the pump mechanism, wherein the delivery lumen extends to an implantable infusion section in the catheter; a pressure sensor positioned to monitor fluid pressure within the delivery lumen of the catheter and provide a pressure signal representative of the fluid pressure; and control electronics connected to receive the pressure signal from the pressure sensor, wherein the control electronics further; develops a pressure modulation profile based on the fluid pressure measured in the delivery lumen; and determines if the pressure modulation profile includes pressure modulation caused by patient cardiac activity. - View Dependent Claims (36)
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37. An implantable infusion system comprising:
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a pump mechanism fluidly coupled to a reservoir to receive fluid contained within the reservoir; a catheter comprising a delivery lumen fluidly coupled to the pump mechanism, wherein the delivery lumen extends to an implantable infusion section in the catheter; a pressure sensor positioned to monitor fluid pressure within the delivery lumen of the catheter and provide a pressure signal representative of the fluid pressure; and control electronics connected to receive the pressure signal from the pressure sensor, wherein the control electronics further; develops a pressure modulation profile based on the fluid pressure measured in the delivery lumen; and determines if the pressure modulation profile includes pressure modulation caused by patient respiration. - View Dependent Claims (38)
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Specification