WO2009095689A1 - Bloc d'alimentation - Google Patents

Bloc d'alimentation Download PDF

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Publication number
WO2009095689A1
WO2009095689A1 PCT/GB2009/000271 GB2009000271W WO2009095689A1 WO 2009095689 A1 WO2009095689 A1 WO 2009095689A1 GB 2009000271 W GB2009000271 W GB 2009000271W WO 2009095689 A1 WO2009095689 A1 WO 2009095689A1
Authority
WO
WIPO (PCT)
Prior art keywords
power unit
portions
component
elongate component
spring
Prior art date
Application number
PCT/GB2009/000271
Other languages
English (en)
Inventor
Barry Peter Liversidge
Original Assignee
Barry Peter Liversidge
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 Barry Peter Liversidge filed Critical Barry Peter Liversidge
Publication of WO2009095689A1 publication Critical patent/WO2009095689A1/fr

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
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
    • 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
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod

Definitions

  • This invention relates to a power unit including a pre-charged drive means and arranged so the energy of the power unit may be released when required.
  • the invention concerns a power unit which may be used in a medical injection device so that when the energy of the pre- charged drive means is released, the power unit thereafter operates the injection device fully automatically, in order to perform an injection.
  • Springs pre-charged with energy are frequently used in power units, such that the spring may release its stored energy when some other device is to be powered.
  • a mechanical lock being employed to hold the spring in its charged condition.
  • the lock includes a lock member which must be moved out of the path of the pump component driven by the spring.
  • the load imparted by the spring on the component and bearing on the lock member will restrict the ease with which the lock member may be moved out of the way of the component, so that significant force is required to move that lock member and release the component - and in this case a solenoid is used for this purpose.
  • a further problem with known forms of power unit for use with injection devices is that it may be possible to release the energy of the spring inadvertently and so before the device powered by the unit is ready.
  • this could mean that a medicament contained within the device is discharged prematurely so leading to waste and much more importantly to an intended patient not receiving the medicament.
  • this could have fatal consequences for the patient in the event that no second injection device is available.
  • a further aim is that the force required to cause the power unit to release its stored energy is not dependent upon the magnitude of the stored energy.
  • a power unit comprising a unitary elongate component defining first and second portions spaced along the length of the component, a dividing zone provided between the first and second portions, and pre-loaded drive means arranged to generate a separating force on said first and second portions, whereby division of the component at the dividing zone allows relative separating movement of the first and second portions, under the action of the drive means.
  • the power unit is a single-shot device, able to operate only once since the release of the energy of the pre-loaded drive means requires division of the unitary elongate component at the dividing zone. Such a device should be relatively simple and so cheap to manufacture, in order that it may simply be thrown away when the energy of the drive means has been released.
  • the preferred form of the device has a dividing zone in the form of a weakened region which can be divided by breaking through the material forming that zone.
  • the dividing zone may be a region of reduced cross-sectional area formed as a neck extending along the length of the elongate component with the first and second portions to the two sides respectively of that neck.
  • the elongate component comprises a unitary plastics material moulding in the form of a rod, with the dividing zone being frangible by way of a force applied laterally to one of the portions, relative to the length of the rod so as to break through the dividing zone.
  • the pre-loaded drive means comprises a helical coil spring surrounding the elongate component and acting in compression on the two portions thereof.
  • One of those portions may be formed as a push rod for driving a member of some other device (such as the piston of a syringe, when the power unit is used within an auto-injection device) and the other portion may be formed as an operating button which may be thrust laterally relative to the one portion, to break the dividing zone.
  • the spring of the power unit may bear on one portion of the elongate component, there being a sleeve surrounding and engaged by the spring so as to bear on the other portion of the elongate component. On division of the elongate component, the one portion and sleeve will be driven apart by the spring.
  • This invention extends to a medical injection device whenever incorporating a power unit of this invention as described above.
  • the movement of one of the portions may initially drive the needle of a syringe into tissue at an injection site and then may drive the piston or plunger of the syringe so as to expel medicament out of the needle of the syringe.
  • This sequential action is possible in view of the hydraulic resistance to expulsion out of the needle of medicament in the syringe.
  • Figure 1 is a side view of the first embodiment of power unit of this invention, in a loaded condition, ready for use;
  • Figure 2 is an isometric view of the power unit of Figure 1 ;
  • Figure 3 is a side view of the power unit of Figures 1 and 2, but following the use thereof;
  • Figure 4 is an isometric view of the used power unit of Figure 3;
  • Figure 5 is an axial section through the second embodiment of power unit of this invention, in a loaded condition ready for use;
  • Figure 6 is an isometric view of the power unit of Figure 5;
  • Figure 7 is an axial section through the second embodiment, but following the use thereof; and Figure 8 is an isometric view of the used power unit of Figure 7.
  • the first embodiment of power unit of this invention comprises an elongate component 10 comprising a moulded plastics material rod divided into first and second portions 11 and 12 by a neck 13 constituting a weakened zone between the portions.
  • the first portion 11 comprises a push rod 14 having an end face 15 for bearing on some other member (not shown).
  • the push rod has a cruciform cross-section but could be of any shape appropriate for the situation in which the power unit is to be used.
  • the end region of the push rod 14 remote from end face 15 has an enlarged section 16 with a flange 17 extending around that enlarged section, where the section joins the push rod 14.
  • the enlarged section also has a cruciform cross- sectional shape.
  • the second portion 12 comprises an operating button 19 including a part-spherical form 20 adjoining the neck 13 and a slightly conically-flared form 21 extending axially away from the part-spherical form 20.
  • a generally helical coil spring 22 has one end bearing on the flange 17 and the other end engages the part-spherical form 20 of the operating button 19. As best seen in Figures 1 and 3, that other end of the spring has the end turns of a reduced diameter as compared to the remainder of the spring, such that the greater length of the spring may freely be passed over the part-spherical form 20 but those last few turns must be resiliency sprung over that part-spherical form.
  • the spring will be in a pre-loaded condition acting between the first and second portions 11,12 of the elongate component 10. Provided the spring rate and the material of the spring is appropriately selected, that pre-load will be insufficient to drive the reduced diameter turns of the spring over the part-spherical form 20.
  • Figures 1 and 2 show the power unit in its pre-loaded condition, ready for use.
  • the power unit will be positioned in some other device having a member against which the end face 15 of the push rod 14 bears, the part-spherical form 20 of the second portion 12 being received in an aperture in a second member of the device such that the form 20 may exert a force thereon.
  • a lateral force is applied to the operating button 19 thereby to break the frangible neck 13 connecting together the first and second portions 11 ,12 of the elongate component 10.
  • the spring force acting on the flange 17 and part-spherical form 20 drives the first and second portions apart, as shown in Figures 3 and 4, so imparting relative movement on the first and second members of the device, with which the power unit is engaged.
  • a typical application for the power unit as described above may be in an auto-injector for the performance of medical injections, where the push rod 14 is used to drive the piston of a syringe in order to expel medicament therefrom, with a reaction being taken up by a member of the auto-injector having an opening for receiving the operating button but engaged with the part-spherical form thereof.
  • the second embodiment of power unit is shown in Figures 5 to 8. Like parts with those of the first embodiment are given like reference numbers; those parts will not be described again here.
  • the second embodiment differs from the first embodiment in that a sleeve 25 is slidably received over flange 17 and the device uses a spring 26 having all of its turns of the same diameter.
  • the sleeve has an inwardly-directed lip 27 at the end thereof adjacent the second portion 12 and the end of the spring remote from flange 17 bears on that lip, rather than on the part-spherical form 20.
  • the power unit of Figures 5 to 8 is assembled by dropping the spring 26 over the operating button 19 and then sliding the sleeve 25 to that part- spherical form 20, whereafter the lip 27 of the sleeve is sprung over the form 20 so as to engage that form from the side nearer the enlarged section 16 of the first portion 11 ; this is shown in Figure 5.
  • the operating button 19 is pressed laterally to break the neck 13 as described in relation to the first embodiment.
  • the part-spherical form 20 will tend to roll around the lip 27 so facilitating the breaking of the plasties material forming the neck 13.
  • the spring will relatively separate the first and second portions 11 ,12 of the elongate component 10, as shown in Figures 7 and 8, so allowing the power unit to cause relative separation of the members of the device within which the power unit is incorporated.
  • That other device must have a member against which the part-spherical form 20 may bear, in order to allow the power unit to exert a separating force on the members of that device.
  • the power unit of Figures 5 to 8 is easier to deploy since the device within which the power unit is incorporated merely has to have a member with a surface against which the sleeve 25 may bear, with the operating button 19 extending through an opening in that surface.

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

La présente invention concerne un bloc d'alimentation adapté pour être incorporé à l'intérieur d'un dispositif médical d'injection de telle manière que lorsqu'il est libéré, le dispositif d'injection fonctionne de façon totalement automatique, pour réaliser une injection. Le bloc d'alimentation comporte un composant unitaire allongé (10) en une matière plastique moulée et ayant des première et seconde parties (11, 12) dotées d'un col cassable (13) entre celles-ci et un ressort préchargé (22) séparant les première et seconde parties. La rupture du col (13) permet au ressort de séparer les première et seconde parties du composant (10) de manière à ce que l'une de ces parties puisse diriger un autre composant tel que le piston d'une seringue.
PCT/GB2009/000271 2008-02-01 2009-02-02 Bloc d'alimentation WO2009095689A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0801875.6 2008-02-01
GB0801875A GB0801875D0 (en) 2008-02-01 2008-02-01 Power unit

Publications (1)

Publication Number Publication Date
WO2009095689A1 true WO2009095689A1 (fr) 2009-08-06

Family

ID=39204076

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/000271 WO2009095689A1 (fr) 2008-02-01 2009-02-02 Bloc d'alimentation

Country Status (2)

Country Link
GB (1) GB0801875D0 (fr)
WO (1) WO2009095689A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102296026B1 (ko) * 2020-12-03 2021-09-02 주식회사 딥큐어 전극 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779677A (en) * 1994-01-17 1998-07-14 Laboratoire Aguettant Automatic drug injector
WO2001047586A1 (fr) * 1999-12-23 2001-07-05 Arnold Neracher Dispositif d'injection et systeme de propulsion associe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779677A (en) * 1994-01-17 1998-07-14 Laboratoire Aguettant Automatic drug injector
WO2001047586A1 (fr) * 1999-12-23 2001-07-05 Arnold Neracher Dispositif d'injection et systeme de propulsion associe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102296026B1 (ko) * 2020-12-03 2021-09-02 주식회사 딥큐어 전극 장치

Also Published As

Publication number Publication date
GB0801875D0 (en) 2008-03-12

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