Patent number 8622998 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "A variety of medical devices are used for chronic, i.e., long-term, delivery of fluid therapy to patients suffering from a variety of conditions, such as chronic pain, tremor, Parkinson's disease, epilepsy, urinary or fecal incontinence, sexual dysfunction, obesity, spasticity, or gastroparesis. For example, pumps or other fluid delivery devices can be used for chronic delivery of therapeutic agents, such as drugs to patients. These devices are intended to provide a patient with a therapeutic output to alleviate or assist with a variety of conditions. Typically, such devices are implanted in a patient and provide a therapeutic output under specified conditions on a recurring basis.
"One type of implantable fluid delivery device is a drug infusion device that can deliver a fluid medication to a patient at a selected site. A drug infusion device may be implanted at a location in the body of a patient and deliver a fluid medication through a catheter to a selected delivery site in the body. Drug infusion devices, such as implantable drug pumps, commonly include a reservoir for holding a supply of the therapeutic substance, such as a drug, for delivery to a site in the patient. The fluid reservoir can be self-sealing and accessible through one or more ports. A pump is fluidly coupled to the reservoir for delivering the therapeutic substance to the patient. A catheter provides a pathway for delivering the therapeutic substance from the pump to the delivery site in the patient.
"Implantable drug delivery or infusion devices are commonly used, for example, when chronic administration of a pharmaceutically active agent or therapeutic substance to a patient is required. An implantable infusion pump-catheter delivery system may be preferred when it is important to deliver the agent to a specific site or when the agent must be administered on a recurrent basis in small, controlled dosages. Precise delivery of appropriate amounts of a fluid agent require accurate characterization of various delivery components of the system, such as the reservoir and catheter. The volume of the catheter, which is proportional to its length, is needed by the clinician or programmer, e.g., when determining the amount of drug needed to prime the entire pump and catheter. Catheter volume is also important when determining the time duration used to maintain a current infusion rate (bridging period) after refilling the pump's reservoir with a different fluid agent or fluid agent concentration to insure that the new infusion rate does not go into effect until the current drug has exited the catheter. Ordinarily, clinicians measure and record the length of catheter during implantation which is then used in calculation priming and bridging durations. However, there are a variety of ways for which this information fails to be recorded or is some how lost leaving clinicians that must manage patient's drug delivery therapies without the catheter length information vital to insuring that the prime and bridge procedures are safe."
In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventor's summary information for this patent: "In general, this disclosure describes techniques for automatically estimating the length of a catheter of an implanted medical device. The techniques may measure a pressure decay response to pumping fluid doses through the catheter. The decay time for a unit fluid pressure pulse is proportional to the length of the catheter. In particular, as the length of the catheter increases, so does the pressure decay time. The catheter length can therefore be estimated based on the decay time of the pressure pulse.
"In one example, a method includes delivering an amount of fluid through an implantable catheter. A pressure within a lumen of the catheter is measured during the delivery of the fluid to the patient. An estimated length for the catheter is calculated based on the measured pressure.
"In another example, an implantable fluid delivery system includes a fluid delivery pump, a catheter, a pressure sensor, and a processor. The catheter is connected to the fluid delivery pump. The pressure sensor is arranged to measure a pressure in a lumen of the catheter. The processor is configured to control the fluid delivery pump to deliver an amount of fluid through the catheter, control the pressure sensor to measure a pressure within a lumen of the catheter during the delivery of the fluid through the catheter, and calculate an estimated length of the catheter based on the measured pressure.
"In another example, a computer-readable medium contains instructions for causing a programmable processor to control a fluid delivery pump to deliver an amount of fluid through an implantable catheter, control a pressure sensor to measure a pressure within a lumen of the catheter during the delivery of the fluid through the catheter, and calculate an estimated length of the catheter based on the measured pressure.
"In still another example, a device includes means for delivering an amount of fluid through an implantable catheter, means for measuring a pressure within a lumen of the catheter during the delivery of the fluid through the catheter, and means for calculating an estimated length of the catheter based on the measured pressure.
"The details of one or more examples disclosed herein are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims."
URL and more information on this patent, see: Kalpin,
Keywords for this news article include: Therapy,
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