Analyte monitoring systems including continuous glucose monitoring systems generally include an analyte sensor such as a subcutaneous analyte sensor, at least a portion of which is configured for fluid contact with biological fluid, for detecting analyte levels such as, for example, glucose or lactate levels, a transmitter (such as for example a Radio Frequency (RF) transmitter) in communication with the sensor and configured to receive the sensor signals and to transmit them to a corresponding receiver unit by, for example, using an RF data transmission protocol. The receiver may be operatively coupled to a glucose monitor that performs glucose related calculations and data analysis.
The transmitter may be mounted or adhered to the skin of a patient and also in signal communication with the sensor. Generally, the sensor is configured to detect the analyte of the patient over a predetermined period of time, and the transmitter is configured to transmit the detected analyte information over the predetermined period of time for further analysis. To initially deploy the sensor so that the sensor contacts and electrodes are in fluid contact with the patient's analyte fluids, a separate deployment mechanism such as a sensor inserter or introducer is used. Moreover, a separate base component or mounting unit is provided on the skin of the patient so that the transmitter unit may be mounted thereon, and also, to establish signal communication between the transmitter unit and the analyte sensor.
As discussed above, the base component or mounting unit is generally adhered to the skin of the patient using an adhesive layer that is fixedly provided on the bottom surface of the base component or the mounting unit for the transmitter.
To minimize data errors in the continuous or semi-continuous monitoring system, it is important to properly insert the sensor through the patient's skin and securely retain the sensor during the time that the sensor is configured to detect analyte levels. In addition to accurate positioning of the sensor through the skin of the patient, it is important to ensure that the appropriate electrode of the analyte sensor are in continuous and proper electrical connection or communication with the corresponding contact points or pads on the transmitter unit.
Additionally, for the period of continuous or semi-continuous monitoring which can include, for example, 3 days, 5 days or 7 days, it is important to have the transmitter unit securely mounted to the patient, and more importantly, in proper contact with the analyte sensor so as to minimize the potential errors in the monitored data.
In view of the foregoing, it would be desirable to have an approach to provide methods and system for accurate and simple ways in which to securely couple the analyte sensor with the transmitter unit so as to maintain continuous electrical connection therebetween. Moreover, it would be desirable to have methods and system for easy deployment of sensors and subsequent simple removal of the same in a time effective and straight forward manner.
In accordance with the various embodiments of the present invention, there is provided method and system for providing analyte sensor alignment and retention mechanism for improved connectivity with a transmitter unit for electrical connection, and further including transmitter unit contact pins with metal components to improve electrical conductivity with the analyte sensor in an analyte monitoring and management system.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description of the embodiments, the appended claims and the accompanying drawings.
Only one sensor 101, transmitter unit 102, communication link 103, receiver unit 104, data processing terminal 105, and medication delivery unit 106 are shown in the embodiment of the analyte monitoring and management system 100 illustrated in
In one embodiment of the present invention, the sensor 101 is physically positioned on the body of a user whose glucose level is being monitored. The sensor 101 may be configured to continuously sample the glucose level of the user and convert the sampled analyte level into a corresponding data signal for transmission by the transmitter unit 102. In one embodiment, the transmitter unit 102 is mounted on the sensor 101 so that both devices are positioned on the user's body. The transmitter unit 102 performs data processing such as filtering and encoding on data signals, each of which corresponds to a sampled analyte level of the user, for transmission to the receiver unit 104 via the communication link 103.
In one embodiment, the analyte monitoring and management system 100 is configured as a one-way RF communication path from the transmitter unit 102 to the receiver unit 104. In such embodiment, the transmitter unit 102 transmits the sampled data signals received from the sensor 101 without acknowledgement from the receiver unit 104 that the transmitted sampled data signals have been received. For example, the transmitter unit 102 may be configured to transmit the encoded sampled data signals at a fixed rate (e.g., at one minute intervals) after the completion of the initial power on procedure. Likewise, the receiver unit 104 may be configured to detect such transmitted encoded sampled data signals at predetermined time intervals. Alternatively, the analyte monitoring and management system 100 may be configured with a bi-directional RF communication between the transmitter unit 102 and the receiver unit 104.
Additionally, in one aspect, the receiver unit 104 may include two sections. The first section is an analog interface section that is configured to communicate with the transmitter unit 102 via the communication link 103. In one embodiment, the analog interface section may include an RF receiver and an antenna for receiving and amplifying the data signals from the transmitter unit 102, which are thereafter, demodulated with a local oscillator and filtered through a band-pass filter. The second section of the receiver unit 104 is a data processing section which is configured to process the data signals received from the transmitter unit 102 such as by performing data decoding, error detection and correction, data clock generation, and data bit recovery.
In operation, upon completing the power-on procedure, the receiver unit 104 is configured to detect the presence of the transmitter unit 102 within its range based on, for example, the strength of the detected data signals received from the transmitter unit 102 or a predetermined transmitter identification information. Upon successful synchronization with the corresponding transmitter unit 102, the receiver unit 104 is configured to begin receiving from the transmitter unit 102 data signals corresponding to the user's detected glucose level. More specifically, the receiver unit 104 in one embodiment is configured to perform synchronized time hopping with the corresponding synchronized transmitter unit 102 via the communication link 103 to obtain the user's detected analyte level.
Referring again to
Moreover, the medication delivery unit 106 may include an infusion device such as an insulin infusion pump, which may be configured to administer insulin to patients, and which is configured to communicate with the receiver unit 104 for receiving, among others, the measured analyte level. Alternatively, the receiver unit 104 may be configured to integrate an infusion device therein so that the receiver unit 104 is configured to administer insulin therapy to patients, for example, for administering and modifying basal profiles, as well as for determining appropriate boluses for administration based on, among others, the detected glucose levels received from the transmitter unit 102. Referring again to
Each of the transmitter unit 102, the receiver unit 104, the data processing unit 105, and the medication delivery unit 106 may be configured to communicate with each other over a wireless data communication link similar to the communication link 103 such as, but not limited to, RF communication link, Bluetooth® communication link, infrared communication link, or any other type of suitable wireless communication connection between two or more electronic devices. The data communication link may also include wired cable connection such as, for example, but not limited to, RS232 connection, USB connection, or serial cable connection.
Moreover, referring to
Additional analytes that may be monitored, determined or detected by the analyte sensor 101 include, for example, acetyl choline, amylase, bilirubin, cholesterol, chorionic gonadotropin, creatine kinase (e.g., CK-MB), creatine, DNA, fructosamine, glucose, glutamine, growth hormones, hormones, ketones, lactate, peroxide, prostate-specific antigen, prothrombin, RNA, thyroid stimulating hormone, and troponin. The concentration of drugs, such as, for example, antibiotics (e.g., gentamicin, vancomycin, and the like), digitoxin, digoxin, drugs of abuse, theophylline, and warfarin, may also be determined.
That is, when the transmitter unit housing 210 is positioned on an adhesive layer 240 for adhesion to a skin surface of a patient, the protrusion 220 of the transmitter unit housing 210 is configured to correspondingly mate with a notch or hole 260 on the surface of the analyte sensor 250 such that during the process of placing and guiding the transmitter unit on the adhesive layer 240 (and upon a transmitter mounting unit 270 (
In the manner described above, in one embodiment of the present invention, there is provided a protrusion 220 on the transmitter unit housing 210 which is configured to mate with a notch or hole 260 on the analyte sensor 250 such that substantially accurate positioning and alignment of the analyte sensor 250 with respect to the transmitter unit 102 may be provided.
In this manner, in one embodiment of the present invention, when after analyte sensor 330 has been subcutaneously positioned through the skin of the patient, the transmitter unit housing 310 may be configured to mate with the transmitter mount unit 360 provided on the adhesive layer 320 such that the electrical contact pins 350A, 350B, 350C, 350D guided by the respective lead-in segments 341A, 341B, 341C, 341D on the sensor seal 340 such that the proper alignment of the sensor electrodes and guard trace are provided to the respective electrical contact pins 350A, 350B, 350C, 350D to establish electrical contacts with the same.
Referring back to
Referring back to
In one embodiment, the plurality of hooks/barbs 521A, 521B on the transmitter mount 520 are provided as molded plastic protrusions on the transmitter mount 520. Upon engaging with the respective open segments 511A, 511B on the sensor 510, it can be seen that the sensor 510 is retained substantially in a fixed position relative to the transmitter mount 520 (which is in turn, fixedly positioned on the patient's skin by the adhesive layer 530), so that proper alignment and coupling with the respective electrical contact pins on the transmitter unit 102 may be achieved.
Referring to
In the manner described above, in accordance with the various embodiments of the present invention, there are provided different mechanisms for sensor alignment relative to the transmitter electrical contact pins to effectively couple the sensor contacts (working, reference and counter electrodes and the guard trace), with the corresponding electrical contact pads or connections on the transmitter unit 102. Moreover, as further described above, in accordance with the various embodiments of the present invention, there are provided mechanism for sensor retention and secure positioning relative to the transmitter mount which is placed on the patient's skin such that the transmitter unit 102 may be easily and accurately guided to establish proper connection with the sensor 101.
In one embodiment, the outer body portion 810 may be injection molded using a silicone based, carbon loaded (impregnated, for example) soft polymer material. Furthermore, the end segment 821 and the inner contact portion 820 comprise a metal such as for example, Beryllium copper (BeCu), Nickel Silver, Phosphor Bronze Brass, Rhodium or gold plated to provide improved electrical conductivity. More specifically, the inner contact portion 820 placed within the outer body portion 810 may comprise a light gauge wire (such as 30 g), and may be insert molded into the outer body portion 810.
In this manner, the contact pin 800 in one embodiment includes a carbon loaded, silicone based, injection molded soft polymer pin with a metal cap or end segment 821 which is shaped and positioned to cover substantially a large portion of the contact area where the sensor contact is to occur. Moreover, the metal inner contact portion 820 extending the length of the outer body portion 810 of the contact pin 800 further improves electrical conductivity. Moreover, a metal end segment 821 provides additional resistance to wear over a prolonged use based on repeated contact with other surfaces (for example, sensor surfaces).
Accordingly, in one aspect of the present invention, the transmitter unit 102 may be provided with a plurality of contact pins 800 that have a large metal sensor contact surface to increase the electrical conductivity with the sensor. In addition, the metal contact surface may provide improved resistance to abrasion, wear and damage to the end segment 821 of the contact pin 800. In addition, the contact pin 800 configuration described above also provides flexibility, desired compliance and self-sealing capability, and further, may be press fit into the transmitter housing. Further, the contact pins 800 may additionally be chemically resistant, substantially water proof, and thus improve the transmitter unit 102 interconnect assembly life.
Accordingly, an apparatus for providing alignment in one embodiment of the present invention includes a sensor having a hole thereon, and a transmitter housing including a protrusion at a first end, the protrusion configured to substantially engage with the hole of the sensor such that the transmitter is in electrical contact with the sensor.
An apparatus for providing alignment in accordance with another embodiment of the present invention includes a sensor including a plurality of conductive pads, and a transmitter housing including a plurality of electrical contacts, each of the electrical contacts configured to substantially align with a respective one of the plurality of the conductive pads.
The apparatus may further include a seal segment adhered to the sensor, where the seal segment includes a plurality of radial seal holes disposed on the seal segment, and further, where each of the radial holes may be configured to receive a respective one of the plurality of electrical contacts.
In another aspect, each of the electrical contacts may be substantially tapered.
Moreover, the transmitter electrical contacts may be configured to self-align with a respective one of the conductive pads of the sensor when the transmitter is coupled to the sensor.
An apparatus for providing a sensor connection in a data monitoring system in accordance with yet another embodiment of the present invention includes a sensor having a plurality of conductive pads, and a transmitter housing, the housing including a plurality of electrical contacts, each of the contacts configured to substantially contact the respective one of the sensor conductive pads, where each of the plurality of electrical contacts include conductive polymer.
The electrical contacts in one embodiment may be silicon doped with carbon.
Moreover, the electrical contacts may be substantially conical shaped.
In another aspect, each of the electrical contacts may include a metal component disposed therein, wherein at least a first end of each of the electrical contacts is configured to substantially contact the respective one of the sensor conductive pads.
The metal component may include one of gold or beryllium copper.
An apparatus for providing a sensor connection in a data monitoring system in still another embodiment of the present invention includes a sensor having a plurality of conductive pads, a transmitter mount having a spring biased mechanism, and a transmitter housing, the housing including a plurality of electrical contacts, where each of the plurality of electrical contacts of the transmitter is configured to substantially contact the respective one of the sensor conductive pads by the spring biased mechanism of the transmitter housing.
In yet another aspect, the spring biased mechanism of the transmitter mount may include a tapered cantilever beam disposed on the transmitter mount.
An apparatus for positioning a sensor in a data monitoring system in yet still another embodiment of the present invention may include a sensor having a cutout portion, and a transmitter mount having a latch mechanism, the transmitter mount configured to couple to the sensor by the latch mechanism engaging the cutout portion of the sensor.
An apparatus for positioning a sensor in a data monitoring system in yet still a further embodiment of the present invention may include a sensor, and a transmitter mount, the transmitter including a latch mechanism, the latch mechanism configured to engage with the sensor for substantially permanently positioning the sensor relative to the transmitter.
Further, the latch mechanism may, in one embodiment, include a metal clip.
Various other modifications and alterations in the structure and method of operation of this invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. It is intended that the following claims define the scope of the present invention and that structures and methods within the scope of these claims and their equivalents be covered thereby.
The present application is a continuation of U.S. patent application Ser. No. 11/365,334 filed Feb. 28, 2006, now U.S. Pat. No. 8,029,441, entitled “Analyte Sensor Transmitter Unit Configuration for a Data Monitoring and Management System”, the disclosure of which is incorporated herein by reference for all purposes.
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Number | Date | Country | |
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20120022346 A1 | Jan 2012 | US |
Number | Date | Country | |
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Parent | 11365334 | Feb 2006 | US |
Child | 13252118 | US |