EP1830699A2 - Systeme de detection et procede permettant de detecter des problemes et element de montage de dispositifs medicaux pouvant etre montes sur la peau - Google Patents

Systeme de detection et procede permettant de detecter des problemes et element de montage de dispositifs medicaux pouvant etre montes sur la peau

Info

Publication number
EP1830699A2
EP1830699A2 EP05850488A EP05850488A EP1830699A2 EP 1830699 A2 EP1830699 A2 EP 1830699A2 EP 05850488 A EP05850488 A EP 05850488A EP 05850488 A EP05850488 A EP 05850488A EP 1830699 A2 EP1830699 A2 EP 1830699A2
Authority
EP
European Patent Office
Prior art keywords
skin
medical device
sensor
subject
transcutaneous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05850488A
Other languages
German (de)
English (en)
Inventor
Ole Christian Nielsen
Theresa Rhoades Willerup
Bo Kristoffersen
Peter Christian Klitgaard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novo Nordisk AS
Original Assignee
Novo Nordisk AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novo Nordisk AS filed Critical Novo Nordisk AS
Publication of EP1830699A2 publication Critical patent/EP1830699A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14248—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4836—Diagnosis combined with treatment in closed-loop systems or methods
    • A61B5/4839—Diagnosis combined with treatment in closed-loop systems or methods combined with drug delivery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683—Means for maintaining contact with the body
    • A61B5/6832—Means for maintaining contact with the body using adhesives
    • A61B5/6833—Adhesive patches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A61B5/0531—Measuring skin impedance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/13—General characteristics of the apparatus with means for the detection of operative contact with patient, e.g. lip sensor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M5/16836—Monitoring, detecting, signalling or eliminating infusion flow anomalies by sensing tissue properties at the infusion site, e.g. for detecting infiltration

Definitions

  • the invention relates to skin mountable medical devices in general and in particular provides, among other things, systems and methods for ensuring that the device or components thereof are properly in place with respect to the patient's body.
  • a transcutaneous device such as a needle or cannula.
  • Early detections can improve the quality of treatment by, among other things, resulting in termination of a specific treatment regimen or treatment with a specific apparatus, thereby minimizing tissue injury, securing consistent treatment, and can help minimize cost of treatment by prolonging usage of a system.
  • merely knowing when to change an infuse set can greatly improve conditions for a patient.
  • inflammation When inflammation occurs, it is usually accompanied by detectable local changes in biologi- cal parameters. These properties include, chemical changes near insertion or trauma site, temperature rise, changes in optical properties (e.g. reddening), mechanical property changes, electrical property changes, increased neural activity, changes in acoustic properties or a combination hereof.
  • While many aspects of the present invention are useful with a number of medical devices, such as trans-dermal medication patches, medical sensors, conventional insulin delivery infuse sets, etc., it is particularly well-suited for use with wearable infusion pumps.
  • these pumps have some form of electronic control or a processor.
  • the control units of these pumps can be readily adapted to monitor sensor systems that detect whether a portion of the pump is no longer properly positioned.
  • at least several failure conditions can occur that should be brought to the attention of a patient: adhesive failure, or transcutaneous device disengagement.
  • the present invention can be used to detect other problems, such as inflammation, and can be used with virtually any wearable device.
  • Soft cannulas are replacing rigid steel needles in many infusion and injection devices. These soft cannulas provide many advantages, (e.g. they are more comfortable, cause less reactions, and, in some cases, have better long term properties). Unfortunately, soft cannulas also have some drawbacks. For example, a soft cannula can become crimped and thus not properly deliver medication. Crimping and/or kinking is especially an issue with the insertion of soft cannulas and flexible catheters, especially those inserted at 90 degrees, and/or are of a length of 8mm or shorter. In addition to crimping problems, the soft cannula may be improperly inserted by not being fully extended into the proper skin region. As these cannulas are more comfortable for a patient, the patient may not feel that they have become crimped or otherwise not properly inserted.
  • the insertion site must be visible to allow the wearer to detect an incorrect insertion, or, in the case of insulin delivery devices, users must test blood sugar at certain intervals after inserting a new infusion set to detect if blood sugar is higher than expected.
  • these problems require that users a) be able to see the insertion site and b) remember to test their blood sugar at approximately 3 hours after changing infusion sets and typically a couple of times per 24 hour.
  • Such a system and method of warning a patient is highly desirable in the case of devices that deliver life saving medications, such as insulin, or that monitor life threatening conditions.
  • the present invention may take the form of many embodiments. Those listed here are merely examples and are not in anyway to be construed as the only embodiments possible.
  • a medical device comprising a skin mountable surface having an adhesive for mounting on a skin surface of a patient, a sensor that detects a property that can be indicative of a problematic condition relating to the interface of the device with the patient, and a circuit for sending a signal in response to a predetermined signal from the sensor.
  • a medical device comprising a mounting surface adapted for application to a skin surface of the subject, a transcutaneous device adapted to be arranged subcutaneously in a subject, and sensor means adapted to detect a property that can be indicative of a problematic condition relating to the interface of the device with the subject.
  • the device further comprises circuitry for processing signals from the sensor means and for indicating that a predetermined condition associated with the interface of the device with the subject has been detected, and wherein the sensor means comprises first and second capacitor means.
  • the transcutaneous device may be adapted to conduct an electric current (e.g. through the wall of a conduit, through a drug contained in the conduit, or through a metal conductor), the first capacitor means may be a capacitor plate associated with the mounting surface, and the second capacitor means may be established by the transcutaneous device when it is arranged in the subcutis of the subject, whereby a capacitor can be established between the capacitor plate and the subcutis area positioned there below.
  • the first and sec- ond capacitor means are first and second capacitor plates associated with the mounting sur- face, a capacitive circuit being established when the mounting surface is arranged on a skin surface.
  • the device comprises a patch unit and a housing unit adapted to be coupled to each other, the patch unit comprising the mounting surface and the capacitor plate(s), and the housing unit comprising the circuitry, and wherein the circuitry may be coupled to the capacitor plate(s) by e.g. a capacitive coupling or a galvanic contact.
  • a medical device is provided with a skin mounting surface.
  • the surface may have a skin adhesive applied thereon, or a separate adhesive layer may be used.
  • the adhesive or adhesive layer does not have to cover the entire skin mounting surface.
  • a sensor system can be installed to determine when one portion of the skin mounting surface is sufficiently non-coplanar with another portion so as to indicate that there is at least a portion of the device that is no longer properly engaged with the pa- tient.
  • One embodiment may employ one or more openings (including cut-away portions) in the skin mounting surface and a sensor that senses when portions of the skin mounting surface across an opening from each other are substantially non-coplanar.
  • the sensor comprises two electrical contacts that are mounted directly across the opening from each other. If it is desirable to detect that a needle or cannula is disengaged, the needle or cannula may be mounted thru a portion of the skin mounting surface. That portion can have a sensor that detects when that portion is no longer substantially co-planar with another portion of the skin mounting surface, thus indicating that the needle or cannula may be disengaged.
  • a transcutaneous device's position is monitored via one or more sensors relative to the skin mounting surface.
  • the sensor or sensors can be designed to send a signal that movement indicative of disengagement has occurred.
  • Another embodiment of the present invention that is particularly useful with two-piece infu- sion pumps, or other multi-piece devices, also comprises a skin mountable surface, usually on a first piece of the pump or device.
  • This piece may have an adhesive on the skin mounting surface and may also have holes on the skin mounting surface. This piece is typically, but not necessarily, adhered to the skin first.
  • a second piece of the pump or device is then attached to the first piece.
  • one or more sensors from the second piece can pass thru the holes and contact the skin.
  • the sensors could be mechanical in nature and sense for example pressure, or they could sense skin properties such as impedance, temperature, etc.
  • These sensors can be configured to detect when one portion of the skin mounting device is substantially non-coplanar with another portion or whether a particular sensor is not in suffi- cient contact with the skin so as to ensure that the device or a portion thereof is properly engaged with the patient.
  • one way to determine whether the device is disengaged is to measure a skin property at each sensor and then to compare the properties. Assuming that the device is relatively small, the properties at any sensor within the area defined by the skin mounting surface should be approximately similar. And thus if difference larger than expected are encountered, this may be an indication of disengagement with the skin.
  • electrical sensors one embodiment may have two electrical contacts and skin impedance between the contacts can be monitored. If impedance becomes too high, this might indicate disengagement.
  • a delivery cannula or needle is used as one portion of the sensing system, for ex- ample as an electrical skin contact, and another portion is mounted elsewhere on the skin mountable surface. Skin properties (e.g. impedance, etc) between these two points can be measured and/or monitored for a change indicative of a loss of skin contact or disengagement from the body of the user. If an electrical conducting cannula is used or if the liquid to be infused is electrically conductive the cannula/infusion liquid may be used as sensor in it self, thus making a circuit like that depicted in figure 4 possible employing only one additional electrode.
  • the signal send by the device is acoustic, thus directly notifying the wearer of the device that corrective action has to be carried out.
  • an electromagnetic signal is send to a control unit comprising means for alarming the wearer of the device.
  • an electromagnetic signal is send from the device to a relay device. Upon receiving the alarm signal the relay device conveys the alarm to one or more further devices.
  • sending an alarm may be either by conveying a signal or by stopping the transmission of an "OK" signal.
  • the last option is in particular useful in that certain malfunctions of the device like e.g. a power failure device will be detected by the user.
  • the present invention may take on diverse embodiments, it is possible to configure the present invention to monitor for inflammation, trauma or other conditions indicative of a problem with a skin mountable medical device.
  • sensors can monitor for changes in skin characteristics at or near the area of insertion or in the vicinity of where the device is mounted to the skin.
  • a controller can send a signal to the user.
  • the present invention may be an apparatus or method for detecting bodily reactions to the medical device as well as loss of engagement between the body and the wearable device or portion thereof.
  • the transcutaneous device may be a transcutane- ous access device, the medical device further comprising a reservoir adapted to contain a fluid drug, and an expelling assembly adapted for cooperation with the reservoir to expel fluid drug out of the reservoir and through the transcutaneous access device.
  • the transcutaneous device may be in the form of a transcutaneous sensor device, the medical device further comprising processor means adapted to transmit and/or process data acquired via the sensor device.
  • a patient is provided with a soft cannula (or other transcutaneous delivery device) to deliver medication below a skin surface.
  • the cannula has some fiber optic-like properties and allows light to be transmitted and/or refracted thru the cannula.
  • Light or a signal comprised of light with certain characteristics in the cannula can be monitored.
  • a non- crimp condition will result in a specific observable characteristic in the light, such as intensity, or certain frequency or wavelength, but a crimped condition will cause a change in this moni- torable characteristic and thus can be used to alert a user of a problem with the cannula.
  • any measurable or monitorable property of a transcutaneous device that changes upon improper insertion can be employed with the present invention to determine when improper insertion has occurred and the present invention is not limited to use of fiber optic properties of soft cannulas.
  • a system comprises a soft catheter comprised of a light carrying polymer, a light source, such as a light emitting diode transmitted through the light- carrying (fiber-optic) polymer, and a sensor to detect the refraction range of the color at the end of the polymer.
  • a detection of a light range within a certain spectrum will indicate if the catheter is blocked, e.g., crimped, allowing the system to then alert the user to the problem.
  • Another embodiment of the present invention utilizes the light carrying ability of the cannula to transmit light over its length and below the surface of the patient's skin.
  • a sensor near the insertion site and located on or near the outer surface of the skin can detect light. If the cannula is not fully inserted or if it is crimped, the surface of the skin will be more illuminated than if the cannula is un-crimped and terminates at the proper depth below the skin. The sensor can thus indicate when crimping or improper insertion has occurred and the user can be warned. The cannula and sensor need not be visible to the user.
  • the present invention provides a method for detecting improper insertion of a trans- dermal device, the method comprising the steps of: (a) inserting a transdermal device through a skin surface, (b) transmitting a signal through the transdermal device, (c) monitor whether the transmitted signal is exiting into a patient at a predetermined depth below the skin surface of a patient, and (d) if the predetermined quantity of the signal is lost before exiting at the predetermined depth, notifying the user of an insertion problem.
  • a further method for warning the user that a soft cannula is improperly inserted comprising the steps of: (a) inserting a cannula out of sight of a patient, (b) monitoring a property of the cannula that changes upon improper insertion, and (c) when the monitoring indicates improper insertion, warning the patient.
  • circuitry covers any combination of electronic circuitry and associated components, e.g. sensors, suitable for providing the specified functionality, e.g. sensing properties, processing data and controlling memory as well as all connected input and output devices.
  • the circuitry may comprise one or more processors or CPUs which may be supplemented by additional devices for support or control functions.
  • the sensor means, a transmitter, or a receiver may be fully or partly integrated with the controller, or may be provided by individual units.
  • Each of the components making up the circuitry may be special purpose or general purpose devices.
  • figs. 1 -9 shows in perspective views the sequences of use for a first embodiment of a drug delivery device
  • fig. 9A shows perspective view of the interior of a reservoir unit
  • fig. 10 shows an embodiment of a skin-mountable medical device
  • fig. 1 1 shows a further embodiment of a skin-mountable medical device
  • fig. 12 shows a part of a yet further embodiment of a skin-mountable medical device
  • figs. 13 and 14 shows first and second situations of use of a skin-mountable medical device comprising a soft cannula
  • fig. 15 shows an embodiment of a skin-mountable medical device.
  • the transcutaneous device unit 2 comprises a transcutaneous device in the form of a hollow infusion needle and will thus in the following be termed a needle unit, however, the needle may be replaced with any desirable transcutaneous device suitable for delivery of a fluid drug.
  • the transcutaneous device may be in the form of a sensor and the second unit may comprise sensor means adapted to cooperate with the needle sensor.
  • fig. 1 shows a perspective view of medical device in the form of a modular skin-mountable drug delivery device 1 comprising a patch-like needle unit 2 and a reservoir unit 5.
  • a modular skin-mountable drug delivery device 1 comprising a patch-like needle unit 2 and a reservoir unit 5.
  • each of the units are preferably enclosed in its own sealed package (not shown).
  • the needle unit comprises a base portion 10 with a lower mounting surface adapted for application to the skin of a user, and a housing portion 20 in which a hollow infusion needle (not shown) is arranged.
  • the needle comprises a first needle portion having a pointed distal end adapted to penetrate the skin of a user, and a second pointed end adapted to be arranged in fluid communication with the reservoir unit.
  • the pointed end of the needle is moveable between an initial position in which the pointed end is retracted relative to the mounting surface, and an extended position in which the pointed end projects relative to the mounting surface. Further, the needle is moveable between the extended position in which the pointed end projects relative to the mounting surface, and a retracted position in which the pointed end is retracted relative to the mounting surface.
  • the needle unit further comprises user-gripable actuation means in the form of a first strip-member 21 for moving the pointed end of the needle between the initial and the second position when the actuation means is actuated, and user-gripable retraction in the form of a second strip-member 22 means for moving the pointed end of the needle between the extended and the retracted position when the retraction means is actuated.
  • the second strip is initially covered by the first strip.
  • the housing further comprises user-actuatable male coupling means 40 in the form of a pair of resiliently arranged hook members adapted to cooperate with corresponding female coupling means on the reservoir unit, this allowing the reservoir unit to be releasable secured to the needle unit in the situation of use.
  • the base portion comprises a relatively rigid upper portion 11 attached to a more flexi- ble adhesive sheet member 12 having a lower adhesive surface providing the mounting sur- face per se, the adhesive surface being supplied with a peelable protective sheet.
  • the base portion also comprises a ridge member 13 adapted to engage a corresponding groove on the reservoir unit.
  • the reservoir unit 5 comprises a pre-filled reservoir containing a liquid drug formulation (e.g. insulin) and expelling means in the form of an electronically controlled pump for expelling the drug from the reservoir through the needle in a situation of use.
  • the reservoir unit has a generally flat lower surface adapted to be mounted onto the upper surface of the base portion, and comprises a protruding portion 50 adapted to be received in a corresponding cavity of the housing portion 20 as well as female coupling means 51 adapted to engage the corresponding hook members 31 on the needle unit.
  • the protruding portion provides the interface between the two units and comprises a pump outlet and contact means (not shown) allowing the pump to be started as the two units are assembled.
  • the lower surface also comprises a window (not to be seen) allowing the user to visually control the contents of the reservoir.
  • First step in the mounting procedure is to assemble the two units by simply sliding the reservoir unit into engagement with the needle unit (fig. 2).
  • a "click" sound is heard (fig. 3) signalling to the user that the two units have been properly assembled. If desired, a visual or audible signal may also be generated.
  • the user removes the peelable sheet 14 to uncover the adhesive surface (fig. 4) where after the device can be attached to a skin surface of the user, typically the abdomen (fig. 5).
  • Infusion of drug is started by gripping and pulling away the actuation strip 21 as indicated by the arrow whereby the needle is inserted followed by automatic start of the infusion (fig. 6).
  • the needle insertion mechanism may be supplied in a pre-stressed state and subse- quently released by the actuation means or the needle insertion may be "energized” by the user.
  • a "beep" signal confirms that the device is operating and drug is infused.
  • the reservoir unit is preferably provided with signal means and detection means providing the user with an audible alarm signal in case of e.g. occlusion, pump failure or end of content.
  • the device After the device has been left in place for the recommended period of time for use of the needle unit (e.g. 48 hours) - or in case the reservoir runs empty or for other reasons - it is removed from the skin by gripping (fig. 7) and pulling (fig. 8) the retraction strip 22 as indicated by the arrows which leads to retraction of the needle followed by automatic stop of drug infusion where after the strip which is attached to the adhesive patch is used to remove the device from the skin surface (fig. 9).
  • the two units are disengaged by simultaneously depressing the two hook members 31 allowing the reservoir unit 5 to be pulled out of engagement with the needle unit 2 which can then be discarded. Thereafter the reservoir unit can be used again with fresh needle units until it has been emptied.
  • Fig. 9A shows the reservoir unit with an upper portion of the housing removed.
  • the reservoir unit comprises a reservoir 560 and an expelling assembly comprising a pump assembly 500 and control and actuation means 580, 581 therefore.
  • the pump assembly comprises an out- let 322 for connection to a transcutaneous access device and an opening 523 allowing an internal fluid connector to be actuated, this providing a fluid communication between the pump assembly and the reservoir.
  • the reservoir 560 is in the form of prefilled, flexible and collapsible pouch comprising a needle-penetratable septum adapted to be arranged in fluid communication with the pump assembly, see below.
  • the shown pump assembly is a me- chanically actuated membrane pump, however, the reservoir and expelling means may be of any suitable configuration.
  • the control and actuation means comprises a pump actuating member in the form of a coil actuator 581 arranged to actuate a piston of the membrane pump, a PCB or flex-print to which are connected a microprocessor 583 for controlling, among other, the pump actuation, contacts 588, 589 cooperating with the contact actuators on the needle unit, signal generating means 585 for generating an audible and/or tactile signal, a display (not shown) and an energy source 586.
  • the contacts are preferably protected by membranes which may be formed by flexible portions of the housing.
  • Fig. 10 shows medical device 100 comprising a mounting surface 101 adapted for application to a skin surface 102 of the subject, and a transcutaneous device 1 10 adapted to be arranged in the subcutis 103 a subject.
  • the transcutaneous device may be in the form of a transcutaneous drug delivery device, e.g. a needle or a soft cannula, or a sensor device.
  • the transcutaneous device is adapted to conduct an electric current.
  • the device further comprises first capacitor means in the form of a capacitor plate 120 associated with the mounting surface.
  • the capacitor of this and any of the following embodiments may be provided by any conducting surface, e.g. a thin metal foil or a conducting paint.
  • the second capacitor "plate” is established by the transcutaneous device when it is arranged in the subcutis of the subject, the subcutaneous tissue operating as a low impedance plan, whereby a capacitor is established between the capacitor plate and the subcutis area positioned there below.
  • the device also comprises a voltage AC source 131 connected to the capacitor plate and the transcutaneous device, a resistor 132 arranged there between, and detecting circuitry for processing signals from the capacitor and for indicating that a predetermined condition associated with the interface of the device with the subject has been detected.
  • Such a condition could be that the device had been removed fully or partly from the skin surface or that the transcutaneous device had been pulled out of the subcutis of the subject, all conditions that to a certain degree would result in a measurable change in capaci- tance of the system established by the two capacitor plates.
  • An alternative measuring system could be a current AC generator applied between the capacitor plate and the transcutaneous device and a circuit to measure the AC voltage over this described capacitor system.
  • the transcutaneous device is in the form of a transcutaneous ac- cess device (e.g. needle or soft cannula) just as the device comprises a process unit 140 in the form of a reservoir 141 adapted to contain a fluid drug, and an expelling assembly 142 adapted for cooperation with the reservoir to expel fluid drug out of the reservoir and through the transcutaneous access device.
  • a transcutaneous ac- cess device e.g. needle or soft cannula
  • the device comprises a process unit 140 in the form of a reservoir 141 adapted to contain a fluid drug, and an expelling assembly 142 adapted for cooperation with the reservoir to expel fluid drug out of the reservoir and through the transcutaneous access device.
  • Z(C-patch) is the impedance for the patch-subcutis capacitor at a given AC frequency.
  • i(f) is the generator current at the given AC frequency described in the alternative measuring system above.
  • V (X-threshold) are different limits for a given detection scheme of the voltage difference measured across the patch-subcutis capacitor.
  • V(OK-threshold) ⁇ Z(C-patch) * i(f) ⁇ V(Not-OK-threshold) means that the patch and/or cannula properly is becoming detached.
  • thresholds for different levels of detachments may be determined, e.g. 25%, 50% or 75%. Such percentages do not necessary indicate that the patch has become e.g. 25% loose as the capacitance will drop with the distance between the two capacitor plates, e.g. the greater an area of the device has become loose and the greater the displacement from the skin surface, the greater the difference in capacitance.
  • a medical device 200 comprises first and sec- ond capacitor plates 221 , 222 associated with the mounting surface, whereby a capacitive circuit can be established when the mounting surface is arranged on a skin surface.
  • Fig. 12 shows in partial representation a medical device 300 comprising a patch unit 310 and a housing unit 320 adapted to be coupled to each other, the patch unit comprising a mount- ing surface 301 and the capacitor plate(s) 320, and the housing unit comprising the circuitry (see fig. 11 ).
  • the circuitry is coupled to the capacitor plate(s) by a capacitive coupling 325.
  • Fig. 15 shows a medical device 400 comprising a patch unit 410 and a housing unit 420 adapted to be coupled to each other, the patch unit comprising a mounting surface 401 adapted for application to a skin surface of a subject, and a transcutaneous device 415 adapted to be arranged subcutaneously in a subject.
  • the lower surface of the patch unit comprises two openings 411 , 412.
  • the housing unit comprises two sensors 431 , 432, arranged in alignment with the two openings, and thereto connected cir- cuitry 430 for processing signals from the sensors and for indicating that a predetermined condition associated with the interface of the device with the subject has been detected.
  • the shown sensors 431 , 432 may represent sensors "per se", e.g.
  • the medical device may be of unitary construction as in the fig. 10 embodiment, just as one or more than two sensors may be used.
  • the sensor means are adapted to detect a property that can be indicative of a problematic condition relating to the interface of the device with the subject, e.g. the sensors may be capable of detecting characteristics indicative of inflammation, an optical property of skin, or other conditions indicative of an insertion site reaction.
  • the sensors may be adapted to monitor a characteristics indicative of the position of the medical device relative to a skin surface, e.g. the sensor may be capable of sensing temperature, distance (e.g. meas- uring the distance between the lower surface of the device and the skin surface, e.g. using echo determination), position (e.g. the acoustic properties (e.g.
  • the natural frequency of the device will change depending on how the device is attached to the skin, this being detectable by e.g. a sound generator and detector), motion pattern (e.g. a changed motion pattern being indicative of the device having become loose relative to the skin), or a contact force between the apparatus and a skin surface (e.g. a spring actuated sensor).
  • a sound generator and detector e.g. a microphone and detector
  • motion pattern e.g. a changed motion pattern being indicative of the device having become loose relative to the skin
  • a contact force between the apparatus and a skin surface e.g. a spring actuated sensor
  • a lower adhesive surface portion of a flexible patch foil may have an area with a relatively weak adhesive to which an optical marker is attached, the optical marker having a lower surface with an adhesive e.g. corresponding to adhesive on the main portion of the patch foil.
  • the patch foil above the marker has an optical opening which initially is covered (from below) by the marker. In case the patch becomes (partly) detached and able to move relative to the marker, the optical opening will no longer be closed, which condition can be detected by an optical sensor and the information used to detect early disengagement of the patch.
  • the marker and the patch may form first and second portions of an electrical contact.
  • the marker may be attached to the patch foil by e.g. a string or other means.
  • a portion of the adhesive patch foil may be applied to a skin surface in a stretched condition, this allowing the initially stretched portion to contract in case the stretched portion disengage from the skin.
  • a marker e.g. optical, electrical, or magnetic
  • Such a stretched portion may e.g. be arranged around a transdermal device where correct attachment of the device to the skin is most important.
  • a given patch may comprise two or more detections systems (each comprising sensors of any suitable type), one for the area surrounding a transdermal device, and one or more for the remaining portion of the device.
  • a thermal sensor system may be used.
  • a thermal actuator may apply a small amount of energy to the skin surface to which it is intended to be in contact with.
  • the thermal actuator When the thermal actuator is in contact with the skin there will be almost no temperature raise in the tip of the actuator because of the specific heat capacity of the skin whereas the temperature in the actuator tip will raise if the skin is not receiving the heat cur- rent.
  • the thermal sensor should register a raise in temperature.
  • a medical device may include a series of electrical contacts that are mounted to a skin contacting surface of a medical device.
  • the device can be affixed to a skin surface with an adhesive.
  • the adhesive may be applied directly to the skin contacting surface or may be a two-sided tape or the like.
  • the surface may have several portions. Between the several portions of the surface, holes or openings may be interspersed.
  • a first contact may be connected to a first portion of the skin mounting surface, a second contact may be connected to a second portion of the skin mounting surface, and the contacts may be positioned across an opening.
  • a cannula, needle, or other transcutaneous device is mounted through the one of the surfaces.
  • the contacts When the two surfaces are substantially coplanar, the contacts remain engaged with each other and form a closed circuit.
  • the two surfaces need not be perfectly planar, as any given surface is rarely truly planar. Indeed, most skin surfaces are not perfectly planar but nonetheless may still have portions that are substantially planar. However, when the two surfaces become substantially non-coplanar, the contact between them disengage and an open circuit is formed.
  • a controller such as a processor based controller, can be used to send a signal or record information relating to the various states of the circuit formed by the contacts. As a result of the change of state of the circuit, a signal can be sent to the patient to warn of possible skin disengagement.
  • the same embodiment can be used to detect when the cannula has moved out of engage- ment with the skin surface.
  • a cannula is mounted through a surface.
  • a contact connected to this surface can be used to detect when the two surfaces are substantially non- coplanar, thus indicating that one of the surfaces has moved away from the skin surface.
  • the circuit in this embodiment only shows relative movement, it may not be able to differentiate between cannula disengagement and loss of adhesion of the remainder of the other sur- face.
  • the other skin mounting surfaces may e.g. be monitored to determine that they are in proper contact with the skin surface.
  • the cannula does not need to be surrounded by a skin contacting surface. In some such embodiments it may be desirable to connect a portion of a sensor directly to the cannula. This arrangement allows for detection when the cannula moves relative to a surface on the device, such as is the case when the cannula is improperly inserted or fails to be completely inserted.
  • the present invention may employ sensors that detect inflammation or site reactions to a wearable device. This is particularly useful in detecting injection site reactions.
  • detectors are placed in or under the adhesive securing the transdermal device to the skin. The detectors may be arranged such that one of the detectors may be near an insertion site whereas other detector or reference detector is located a distance away from the insertion site.
  • a monitoring device may monitor the sensors and compares the detected values for differences both at a given time and as a function of time. For example inflammation may be detected by changes in dermal properties set forth in the table below.
  • sensors have been described which may be used to detect a visual chance in skin appearance e.g. around the insertion site for a transcutaneous device.
  • two principal solutions to the problem is proposed, (i) Instead of putting the eyes to the infusion site the image of the infusion site is put to the eyes, (ii) Instead of using the eyes and brain to see and analyze the problem it is recorded and analyzed artificial and only the result is transferred directly or indirectly to the user.
  • the two solutions can also be combined.
  • the image can be acquired and displayed e.g. in the following ways: (a) By a camera func- tion recording the image at the infusion site and displaying it on a device that can be taken to the eyes - the recording is either as one or more snapshots or continuously, (b) By an image guiding system based on reflections as in an endoscope where one end is at the infusion site and the other end transferring the image to the eyes, (c) Based on light sensitive film as used in cameras. The film is exposed and the developed image taken to the eyes.
  • the camera function/part and the displaying part could be the same device, e.g. handheld as in a cell phone. If the infuser already utilizes a remote controller the camera part and displaying part could be build into this device.
  • the camera function/part could also be an integrated part of the infuser attached to the user.
  • a portion of an ASIC may comprise a C-MOS image sensor (or otherwise be associated with an image sensor), the images being transferred to the ASIC by an optical guide system, e.g. an optical fiber or a mirror system.
  • an optical guide system and an image sensor could be regarded a sensor means providing information to the above-described circuitry for processing signals from a sensor means.
  • the image could then be transferred to the displaying device either by mov- ing a data memory, by data channels as e.g. a wire or wirelessly.
  • Additional analyzing algorithms can be applied on the acquired images in order to achieve information from the images, e.g. pattern recognition techniques, spectral sensitivities, time dependent development, averaging or zooming.
  • Additional recording means can be applied on the recording environment in order to achieve information from the images, e.g. certain spectral illumina- tion of the spot.
  • the processed information or the result hereof can be transferred to the user.
  • the analyzing could take place continuously, regularly or on user demand. The analyzing could take place without the user's awareness.
  • a primary advantage of such a camera equipped system would be the increased ability for the user to monitor and/or inspect the infusion site including the catheter, hereby avoiding hazards related to malfunction of the infuser, transdermal device, adhesive and unintended skin reactions. Build-in algorithms to evaluate/analyze the images will also increase this possibility, especially if they operate continuously.
  • a skin mountable infusion device 600 has skin mounting surface 601 and a soft cannula 610 that protrudes thru the skin mounting surface.
  • the soft cannula is in fluid communication with a fluid delivery assembly 620 (comprising an expelling assembly and an associated reservoir) and may be inserted through a skin surface 602.
  • WO 03/090509 which is hereby incorporated by reference, discloses an insertion scheme for a cannula based delivery device.
  • the cannula may be fixed relative to the mounting surface of a delivery device i.e., e.g. as in a traditional infusion set. Of course other schemes may be used and the user does not have to observe actual insertion.
  • a light source 631 such as an LED is located near, adjacent to, on the surface of, or in any other manner that allows light to be inserted into the cannula. For example it may, in some embodiments, be possible to have the light source within the medication reservoir, or integral with it in a manner that allows the cannula to be illuminated.
  • a sensor 632 is located such that it can detect light within the cannula. When the cannula is in an un-crimped state, as is the case in fig. 13, the light will have a certain characteristic, such as color, intensity, e.g. when the cannula becomes crimped, as is shown in fig.
  • the crimp or kink 611 causes he characteristic of the light to change and this change will be detected by the sensor 632.
  • the device further comprises circuitry 633 for processing signals from the sensor and for indicating that a pre- determined condition associated with the cannula has been detected, e.g. a certain degree of crimping, kinking or other damage.
  • the circuitry may be connected to an alarm 635 that warns the patient, or a circuit interfaced with an alarm device. Thus, the patient does not need to observe the insertion site to know that there is a problem with the cannula insertion.
  • the invention is not limited to one specific location of a light source and one location of a sensor.
  • the invention is not limited to the use of light to detect crimping. Any suitable property of the cannula indicative of crimping can be used with the present invention, e.g., vibration by a piezo actuator.
  • a sensor is located near the skin surface where the cannula penetrates the skin of the subject. In an un-crimped and properly inserted position, the light exits the cannula at a depth D below the skin surface. If the cannula is crimped or improperly inserted, the light will exit at a kink or exit the end of the cannula at a depth d, which is closer to the skin surface. The sensor can detect this and then cause the alarm to warn the patient.
  • the present invention is described above with respect to skin wearable medication delivery devices, it is equally applicable to other devices.
  • the system could be implemented in any device especially those comprising a soft catheter, including skin-mounted infusion pumps, insertion sets, CGM sensors, and so forth.
  • the cannula need not necessarily be a medication delivery apparatus, but could instead be some other transdermal device, such as a probe, sensor or the like.
  • the fiber optic nature of the cannula described is but one way to practice the present invention. Other properties, such as mechanical, chemical, etc. can be monitored for changes that occur due to improper insertion.

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  • Medicinal Chemistry (AREA)
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  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne des dispositifs pouvant être montés sur la peau conçus de façon à assurer le positionnement correct desdits dispositifs ou des composants de ceux-ci par rapport au corps du patient. Dans un mode de réalisation spécifique, l'invention concerne une surface de montage conçue pour être appliquée sur la surface de la peau d'un sujet, un dispositif transcutané conçu pour être positionné par voie sous-cutanée dans le corps d'un sujet, et un moyen de détection conçu pour détecter une propriété pouvant indiquer un état problématique associé à l'interface du dispositif chez le sujet. Le dispositif comprend en outre un ensemble de circuits permettant de traiter des signaux issus du moyen de détection et d'indiquer qu'un état prédéterminé associé à l'interface du dispositif avec le sujet a été détecté ; le moyen de détection comprenant un premier et un deuxième condensateur.
EP05850488A 2004-12-22 2005-12-22 Systeme de detection et procede permettant de detecter des problemes et element de montage de dispositifs medicaux pouvant etre montes sur la peau Withdrawn EP1830699A2 (fr)

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US63819104P 2004-12-22 2004-12-22
US63921704P 2004-12-23 2004-12-23
DKPA200500245 2005-02-17
DKPA200500244 2005-02-17
PCT/EP2005/057105 WO2006067217A2 (fr) 2004-12-22 2005-12-22 Systeme de detection et procede permettant de detecter des problemes et element de montage de dispositifs medicaux pouvant etre montes sur la peau

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