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Determination of position of injection needle

  • US 9,008,764 B2
  • Filed: 03/20/2007
  • Issued: 04/14/2015
  • Est. Priority Date: 03/20/2006
  • Status: Expired due to Fees
First Claim
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1. A handheld pen-shaped medication delivery device for expelling a set dose of a medicament to a user, the handheld pen-shaped medication delivery device comprising:

  • a housing,a needle mount for mounting an injection needle having an electrically conducting exterior surface part, the needle receiving portion being adapted to galvanically or capacitively connect to the electrically conducting exterior surface part of the injection needle,a handle being adapted to be gripped on or touched by the hand of the user, an electrically conducting exterior surface part forming part of the handle, the electrically conducting exterior surface part of the handle forming an integral part of the housing or an operable actuator disposed in or on the housing,an electrical circuit comprising;

    structure for determining a value of an electrical signal of a closed electrical signal path comprising an electrically conductive exterior surface part of an injection needle mounted on the device, the electrically conducting exterior surface part of the handle and at least part of the body of the user,structure for determining which of a number of predetermined ranges of values the determined value falls within indicative of the type of tissue into which a tip of the injection needle mounted on the device has been inserted, andstructure for generating an information signal to the user of the medication delivery device.

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