Title of Invention

A MEDICAMENT INJECTION DEVICE

Abstract The present invention relates to a medicament injection apparatus, particularly suitable for use by those with diabetes in which, in use, once a desired dosage of medicament has been selected and expelled from the medicament cartridge into the body of the patient, the injected medicament is allowed to disperse locally from the injection site within the patient's body before the needle arrangement is removed from the patient's body. It is considered to be a problem that in known medicament injection devices the injection interval, that is the time elapsed since a previous injection, is measured following completion of a delivery stroke rather than from dispersion of the injected medicament. A medicament injection device is disclosed in which the time elapsed following an injection operation is calculated from the end of a predetermined period during which medicament is permitted to disperse subsequent to completion of an injection stroke. 1 A medicament injection device in which time elapsed following an injection operation is calculated from the end of a predetermined period during which medicament is permitted to disperse subsequent to completion of an injection stroke
Full Text

Improvements in and relating to medicament injection apparatus.
The present invention relates to a medicament injection apparatus. In particular, but not exclusively, the invention has application for electronically controlled injection apparatus whereby self-administration of a dose of medicament is enabled.
Such apparatus generally outsize a medicament cartridge in which a medicament is stored and comprise a microprocessor that controls a drive mechanism to deliver a controlled dosage of medicament through a needle arrangement. The apparatus are small enough readily to be carried about by a user. As such the apparatus is particularly suitable for use by those with diabetes.
The invention is also suitable for other kinds of medicament injection apparatus, for example injection apparatus in which though the dose setting and dose every are purely mechanical in character a timer is actuated following completion of a dose delivery stroke to indicate a time elapsed since completion of dose delivery stroke.
In each case, in use, once a dashed dosage of medicament has been selected a needle unit of the medicament injection apparatus is inserted into a body of a patient. The drive mechanism is then actuated to cause the selected dosage of medicament to be expelled from the medicament cartridge into the body of the patient.
However, it is necessary once the injection has been made to allow the injected medicament to disperse locally from the injection site within the patient's body before removing the needle arrangement from the patient's body.
It is considered to be a problem, that in known medicament injection devices the injection mterval, that is the time elapsed since a previous injection, is measured following completion of a delivery stroke rather than from dispersion of the injected medicament.
According to a first aspect of the present invention in a medicament injection device the time elapsed following an injection operation is calculated from the end of a

predetermined period during which medicament is permitted to disperse subsequent to completion of an injection stroke.
This has as an advantage that the injection interval is measured from the end of the dispersion period.
Preferably, the medicament injection apparatus provides a signal following completion of the injection operation. This has the advantage. that a user will not inadvertently remove the medicament injection apparatus until after the medicament has been allowed to disperse.
According to a second aspect of the present invention, a method of operation of a
medicament injection apparatus comprising a processor having a tuner, a medicament
cartridge containing medicament, a needle unit to allow medicament to be expelled from
the medicament cartridge and a drive means to cause medicament to be expelled from the
medicament cartridge comprising the steps of
i) operating the drive means to expel medicament from the medicament cartridge;
ii) upon completion of step i) startmg a timer to measure a predetermined period;
iii) upon completion of step ii) resetting the timer to measure the time elapsed since step
ii).
Preferably, step ii) also includes upon completion of step ii) causing a signal to be emitted.
Preferably, the method fiirther includes concurrent with step iii) displaying the time elapsed since step ii).
The invention will now be described, by way of example only, with reference to the
accompanying drawings in which;
Figure 1 shows schematically an arrangement in accordance with the present invention.

Referring to the Figure, a schematic arrangement of a medicament injection device according to the present invention is disclosed. The medicament injection device 2 comprises a housing 4, a control imit or microprocessor 6, a drive means 8, a piston 10 and a needle unit 12. A medicament cartridge 14, which is preferably replaceable, is located between the piston 10 and the needle unit 12. The medicament cartridge 14 includes a closure at a first end adapted to be pierced by the needle unit and a moveable plunger located towards a second end of the medicament cartridge and adapted to be driven by the piston 10 towards the first end of the medicament cartridge 14.
The control unit or microprocessor 6 includes a timer. In use, a dosage of medicament to be injected is set. The drive means 8 is then actuated to drive the piston 10. The drive means 8 may be actuated mechanically or under the control of the control unit or microprocessor 6. Medicament from within the medicament cartridge 14 is then expelled from the medicament injection device 2.
In the illustrated embodiment, the microprocessor 6 operates the drive means 8 to advance the piston 10. However, in an altemative embodiment, the drive means may be operated manually to advance the piston. In this latter case, the microprocessor monitors the operation of the drive means. In each case, the piston is advanced to expel a dosage of medicament from within the medicament cartridge.
The medicament injection device 6 may also include other elements for fulfilling further frinctions as required and known in the art.
The timer associated with the control unit or microprocessor 6 is actuated on completion of movement of the piston 10 - the injection stroke. A predetermined period of time is then allowed to lapse to permit dispersion of the medicament witlun the patient. On completion of this first time period, the timer is reset to zero and actuated once more. The timer now records the injection interval in accordance with the present invention.

The medicament injection apparatus 2 may additionally incorporate a display 16. The display may conveniently comprise an LCD display. The display 16 may be used to indicate the duration of the injection interval.
The medicament injection apparatus 2 may fiirther incorporate a signaling device 18 such as a sounder to signal to the user that the dispersion period has elapsed and that the needle unit may be removed. Alternatively, the user may take the indication of the injection interval on the display 16 as sufficient indication that the dispersion period has elapsed.
A user of the medicament injection device 6 will first operate the medicament injection device 6 to select a dosage of medicament to be injected by the medicament injection device 6. The needle unit 12 will then be inserted into a body of the patient to allow the medicament to be injected. The medicament injection device 6 is then operated to cause the piston 10 to advance.
The user must then allow a short period to elapse to allow the medicament to disperse. If the needle unit 12 is removed too quickly the medicament will escape through the needle wound resulting in an incorrect dosage of medicament having been administered. Thus, when a predetermined time has elapsed following the injection stroke the microprocessor 6 causes a signal, either visual, audible or both, to be given indicating that the needle unit 12 may be removed from the patient. A sounder 18 may be used to generate the signal if an audible signal is required.
At the same time as the signal is given, the microprocessor 6 resets the timer to zero and then measures the time elapsed since the signal was given. The time elapsed since the signal was given may be indicated to a user on the display 16.


CLAIMS
1 A medicament injection device in which time elapsed following an injection operation is calculated from the end of a predetermined period during which medicament is permitted to disperse subsequent to completion of an injection stroke
2 A medicament injection device according to claim 1, in which the medicament injection device signals the end of the injection operation.
3 A medicament injection device according to claim 1 or claim 2, the medicament injection device comprising a drive means and a timer associated with control means, in which the timer measures the predetermined period from completion of operation of the drive means and the control unit resets the timer upon completion of the predetermined period to measure the time elapsed following the injection operation.
4 A medicament injection device according to claim 3, in which the medicament injection device flirter includes a display to indicate the time elapsed following the injection operation.
5 A medicament injection device according to claim 3 or claim 4, in which the medicament injection device flutter includes means to indicate the end of the predetermined period from completion of operation of the drive means.
6 A method of operation of a medicament injection device according to any previous claim comprising the steps of
i) operating the drive means to expel medicament from the medicament cartridge; ii) upon completion of step i) starting a timer to measure a predetermined period; iii) upon completion of step ii) resetting the timer to measure the time elapsed since step ii).
7 A method according to claim 6, in which step ii) also includes upon completion of
step ii) causing a signal to be emitted.

8 A method according to claim 6 or claim 7, in which concurrent with step iii) the
time elapsed since step ii) is displayed.

9. A medicament injection device, substantially as herein described with reference to the accompanying drawings.


Documents:

1369-chenp-2004 claims.pdf

1369-chenp-2004 correspondence-others.pdf

1369-chenp-2004 correspondence-po.pdf

1369-chenp-2004 description(complete).pdf

1369-chenp-2004 drawings.pdf

1369-chenp-2004 form-1.pdf

1369-chenp-2004 form-18.pdf

1369-chenp-2004 form-3.pdf

1369-chenp-2004 form-5.pdf

1369-CHENP-2004 OTHER PATENT DOCUMENT 30-09-2009.pdf

1369-chenp-2004 pct.pdf


Patent Number 242796
Indian Patent Application Number 1369/CHENP/2004
PG Journal Number 38/2010
Publication Date 17-Sep-2010
Grant Date 13-Sep-2010
Date of Filing 20-Dec-2004
Name of Patentee DCA DESIGN INTERNATIONAL LIMITED
Applicant Address 19, CHURCH STREET, WARWICK CV34 4AB, UNITED KINGDOM, NATIONALITY BRITISH COMPANY
Inventors:
# Inventor's Name Inventor's Address
1 LANGLEY, Christopher, Nigel 120 Leicester Lane, Leamington Spa, Warwickshire CV32 7HH (GB).
PCT International Classification Number A61M5/145
PCT International Application Number PCT/GB2002/005695
PCT International Filing date 2002-12-16
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 0130139.9 2001-12-18 U.K.