U.S. patent application number 11/677681 was filed with the patent office on 2007-06-14 for injection device and needle covering device.
Invention is credited to Simone Geiser, Hanspeter Heiniger.
Application Number | 20070135771 11/677681 |
Document ID | / |
Family ID | 7696183 |
Filed Date | 2007-06-14 |
United States Patent
Application |
20070135771 |
Kind Code |
A1 |
Heiniger; Hanspeter ; et
al. |
June 14, 2007 |
Injection Device and Needle Covering Device
Abstract
The present invention is an injection device for injecting a
fluid product from a reservoir includes a casing having at least
two casing portions. The device also includes a mounting for the
reservoir such as an ampoule containing the fluid product to be
administered, wherein one casing portion at least partially
surrounds the reservoir. An activating element for triggering fluid
product administering is provided. The at least one casing portion
surrounding the reservoir is movable relative to the other casing
portion or parts, such that by moving the movable casing portion,
the reservoir and/or an injection needle connected to the same is
accessible from the outer side of the casing, in order to be
replaced.
Inventors: |
Heiniger; Hanspeter;
(Lotzwil, CH) ; Geiser; Simone; (Langnau,
CH) |
Correspondence
Address: |
DORSEY & WHITNEY LLP;INTELLECTUAL PROPERTY DEPARTMENT
SUITE 1500
50 SOUTH SIXTH STREET
MINNEAPOLIS
MN
55402-1498
US
|
Family ID: |
7696183 |
Appl. No.: |
11/677681 |
Filed: |
February 22, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10225571 |
Aug 21, 2002 |
7182749 |
|
|
11677681 |
Feb 22, 2007 |
|
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Current U.S.
Class: |
604/192 |
Current CPC
Class: |
A61M 2005/3247 20130101;
A61M 5/2033 20130101; A61M 5/31546 20130101; A61M 5/31591 20130101;
A61M 5/3257 20130101; A61M 5/31553 20130101; A61M 5/46 20130101;
A61M 5/24 20130101 |
Class at
Publication: |
604/192 |
International
Class: |
A61M 5/32 20060101
A61M005/32 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 22, 2001 |
DE |
101 41 039.5 |
Claims
1. An injection device for administering a fluid product from a
reservoir, said injection device carrying a needle and comprising:
a mounting for the reservoir; a needle cover comprising a cover
portion at least partially surrounding the reservoir and moveable
relative to another cover portion, such that by moving the movable
cover portion, at least one of the reservoir and the needle becomes
accessible, the movable cover portion movable between a forward
position and a retracted position, such that accessing the
reservoir and needle is possible in said retracted position and
hindered in said forward position; and an activating element for
triggering fluid product administering.
2. The injection device of claim 1, wherein said movable cover
portion is moveable sufficiently to expose an end of the
reservoir.
3. An injection device carrying a needle operably coupled to a
reservoir and comprising: a mounting for the reservoir; a needle
cover comprising at least two cover elements, wherein one cover
element at least partially surrounds the reservoir, wherein said
cover element at least partially surrounding the reservoir is
moveable relative to the other cover element, such that by moving
said movable cover element, at least one of the reservoir and the
needle becomes accessible, said movable cover element movable
between a forward position and a retracted position, such that
accessing the reservoir and needle is possible in said retracted
position, said movable cover element substantially covering the
needle in the forward position.
4. The injection device as set forth in claim 3, wherein the
moveable cover element covers a forward end of the needle in the
forward position, and the needle protrudes from a forward end of
said moveable cover element in the retracted position.
5. The injection device as set forth in claim 4, wherein a side
wall of the moveable cover element defines an opening generally
along one side and at the forward end thereof, whereby the
reservoir can be accessed for replacement in the retracted
position, and whereby the reservoir is substantially covered in the
forward position.
6. The injection device as set forth in claim 5, wherein said
opening is formed in an area of a maximum cross-sectional diameter
of the moveable cover element.
7. The injection device as set forth in claim 6, wherein the
moveable cover element is generally semi-circular and comprises two
generally straight, parallel edges.
8. The injection device as set forth in claim 7, further comprising
a restoring element for urging the moveable cover element to the
forward position.
9. The injection device as set forth in claim 8, wherein the
moveable cover element is longitudinally movable relative to the
other cover element, wherein said other cover element includes a
guiding element corresponding to a guiding element of the moveable
cover element and co-operating with it, to enable the moveable
cover element to be guided when it is moved.
10. A needle cover for a needle carried by an injection device, the
needle cover comprising: a first portion coupled to the injection
device and a second portion moveable relative to the first portion
and the injection device such that at least a forward end of the
needle is covered in a forward protective position of the second
portion and such that at least part of the needle protrudes from a
forward end of the second portion in a retracted position; and at
least one guide element for guiding the second portion when it is
moved, wherein a side wall of the second portion defines an opening
at least at its forward end, said opening allowing access to at
least one of the needle and a reservoir associated with the
injection device.
11. The needle cover according to claim 10, wherein the needle
cover is laterally attached to the injection device generally along
the opening.
12. An injection device comprising: a housing; a reservoir to which
an injection needle can be coupled to deliver a fluid product; and
a needle cover comprising: a rear part coupleable to the housing;
and a forward part moveably coupled to the rear part whereby, in an
extended position of the forward part, the forward part and the
rear part at least partially surround the reservoir and the
injection needle and, in a retracted position of the forward part,
at least one of the needle and the reservoir is accessible.
13. The injection device according to claim 12, wherein the forward
part is urged toward the extended position.
14. The injection device according to claim 12, wherein the forward
part telescopes with respect to the rear part.
15. The injection device according to claim 12, wherein the needle
cover is generally hemi-spherically shaped, having an open side
defined by two generally straight, parallel edges, wherein, in the
retracted position, the needle and reservoir are accessible via
said open side.
16. The injection device according to claim 15, wherein the needle
cover provides access to the needle and reservoir, said access
being from a direction generally transverse to the longitudinal
axis of the needle.
17. An injection device comprising: a mounting for a reservoir; a
needle cover comprising at least two cover parts; wherein one cover
part at least partially surrounds said reservoir and is movable
relative to said other cover part or parts, such that by moving
said movable cover part, at least one of said reservoir or an
injection needle connected to the reservoir is accessible from the
side of said cover for replacement; and an activating element for
triggering an injection.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application is a Continuation of U.S. patent
application Ser. No. 10/225,571, filed on Aug. 21, 2002, which
claims the priority of German patent application No. DE 101 41
039.5, filed on Aug. 22, 2001.
FIELD OF THE INVENTION
[0002] The present invention relates to an injection device for
injecting a fluid product that includes a needle covering
device.
DESCRIPTION OF THE RELATED ART
[0003] Injection devices are used for administering a fluid product
such as a medicine, an infusion solution, or a contrast agent from
a reservoir, e.g., an ampoule. An injection needle or cannula is
used to inject the fluid product into human or animal tissue. When
the fluid product in the reservoir is depleted, the reservoir
should be able to be quickly and easily replaced.
[0004] For safety reasons and to prevent the fluid product from
being unintentionally administered, the injection needle may be
covered when not in use. However, the injection needle should be
quickly and reliably accessible when the fluid product is to be
administered. Moreover, since many users of injection devices have
a psychological aversion (so-called "needle phobia") to injection
needles, it may be beneficial to obscure from view at least a
portion of the injection needle.
[0005] Slip-on covering caps which can be removed or pushed
together for covering needles are disclosed in WO 96/11026.
Alternatively, retractable needle covering devices cover at least
the end of the injection needle. The cover is retracted so that the
injection needle can be injected into the tissue.
[0006] Such needle covering devices are disclosed in U.S. Pat. No.
4,804,372 and DE 40 13 769 A1. These injection devices are
comparatively long. Thus, when attempting to place the injection
needle at an angle to the surface of the tissue, the injection
needle may bend and the needle and cover may draw relatively near,
to the point where the injection needle jams in the needle cover.
Moreover, replacing the fluid product reservoir is complicated,
since the needle covering device has to be removed before the
reservoir is replaced. The covering device must then be replaced
afterwards on the new reservoir, which in the case of complicated
injection devices, for example those comprising electronics, can
lead to significant time loss and sources of danger.
SUMMARY OF THE INVENTION
[0007] In one embodiment, the present invention is an injection
device wherein a fluid product reservoir, e.g., an ampoule, can be
replaced quickly and easily. Moreover, the injection device is
reliable and easy to handle. A needle covering device for such an
injection device is also to be provided.
[0008] In one embodiment, the injection device includes a casing
having at least two casing portions; a mounting for the reservoir
and an activating element for triggering fluid product
administering. One casing portion at least partially surrounds the
reservoir and can be moved relative to the reservoir (or to the
other casing portions). Thus, by moving the movable casing portion,
the reservoir and/or an injection needle connected to the reservoir
is accessible from the outer side of the casing and can be
replaced.
[0009] Thus, the reservoir, e.g., an ampoule, can be changed
without having to open the actual casing of the injection device.
In this respect, the movable casing portion may be formed
comparatively small in comparison to the non-movable casing
portions; that is, adapted to the size of the reservoir to be
replaced. Thus, the actual casing or main casing of the injection
device can contain the elements necessary for it to operate. For
example, complex mechanism such as a counter and display means
(including any required circuitry) can be disposed within the
casing. Additionally, such parts can include a dosing means, an
activating means and similar elements that are not altered in their
positions relative to each other when a reservoir is replaced.
Thus, their settings relative to each other also do not have to be
reset when the reservoir is replaced. Moreover, dirt and moisture
are prevented or at least hindered in reaching sensitive parts.
Thus, the injection device can be operated more reliably and with
less maintenance. Furthermore, the more sensitive parts of the
injection device can be sealed against dirt, dust and moisture and
other environmental influences.
[0010] In one embodiment, the movable casing portion can be moved
in an axial direction (relative to the reservoir) between a forward
position and a retracted position. Replacement of the reservoir
and/or an injection needle occurs when the moveable casing is in
the retracted position and prevented (or at least hindered) in the
forward position. The movable casing portion may also be movable in
other directions relative to the reservoir. For example, the
moveable portion may move perpendicular to the axial direction,
i.e., away from the main casing of the injection device, in order
to provide a suitable space such that the reservoir and/or the
injection needle can be grasped from the outer side of the casing
for replacement.
[0011] In one embodiment an injection device includes a casing
having at least two casing portions, a mounting for the reservoir
and an activating element for triggering fluid product
administering. One casing portion at least partially surrounds the
reservoir and can be moved relative to the reservoir or to the
other casing portions of the injection device, such that by moving
the movable casing portion, the reservoir and/or an injection
needle connected to the same is accessible from the outer side of
the casing, in order to be replaced.
[0012] For injection into tissue, the needle protrudes beyond a
forward end of the injection device. The position of the movable
casing portion is adapted to the position and length of the
injection needle. Thus, when the casing is in a forward protective
position, the forward end of the movable casing portion protrudes
beyond the forward end of the casing of the injection device and
the needle. However, in order to enable the fluid product reservoir
to be easily replaced, the movable casing portion can be moved back
beyond the forward end of the reservoir, where the injection needle
is conventionally connected to the reservoir, such that the forward
part of the reservoir can be handled. The needle covering device
can be retracted back beyond the forward end of the reservoir by a
distance that approximates the width of an average finger, so that
the reservoir can at least be grasped by two fingers for
removal.
[0013] The casing portion can include a forward part and a forward
end of the reservoir can protrude from the forward end of the
forward part and the movable casing portion can be movable back at
least as far as the forward end of the forward part, such that the
forward end of the reservoir can easily be grasped from the outer
side of the casing, i.e., from its facing side, in order to be
replaced.
[0014] In one embodiment, the movable casing portion is
simultaneously formed as a needle cover for the injection needle
and serves to protect against the injection needle being
unintentionally injected into a tissue or unintentionally
touched.
[0015] In one embodiment, the needle cover includes at least one
section which can be moved relative to the casing, or is formed by
such a section, such that at least a forward end of the injection
needle is covered by the cover in a forward protective position of
the cover, and protrudes from a forward end of the cover in a
retracted position of the cover. Thus, by placing the injection
device together with the needle cover on the tissue and by pressing
the injection device as a whole, the injection needle can be
injected into the tissue without the user seeing the injection
needle before it injects.
[0016] In one embodiment, the cover is substantially tube-shaped
and has a circular, elliptical, rectangular or polyhedral
cross-section. Due to a lateral opening in the cover, it can be
laterally attached to the injection device, at least partially
surrounding the fluid product reservoir. This type of arrangement
enables a range of advantages. For example, the fluid product
reservoir can be attached laterally to the injection device, such
that the conventionally used elongated reservoirs (e.g., ampoules)
can be practically supported along their entire length on a side
wall of the casing. Thus, the reservoir attachment is mechanically
stable, especially with regard to twisting and bending forces. Due
to the lateral arrangement of the reservoir, injection devices of
shorter lengths can be provided, given fluid product reservoirs of
comparable length, such that overall weaker leverage forces are
acting on the injection needle and/or the needle covering device.
The somewhat larger width of such an injection device is not
disruptive. Rather a large width is often advantageous, since
otherwise relatively narrow, pen-shaped injection devices can then
be formed such that they are easily grasped, for example fitting
into a patient's fist.
[0017] When the fluid reservoir is laterally attached to an
injection device, the reservoir together with the injection needle
is more accessible and can be more easily replaced and monitored.
For example, the fluid product reservoir can easily be grasped for
replacement, once the cover has been retracted. For example, the
reservoir can be grasped and rotated and thus screwed in or out.
The injection needle is nonetheless reliably and mechanically
covered in the forward protective position of the needle cover,
since when attached laterally to a casing of an injection device,
the needle cover is laterally supported substantially along its
entire length.
[0018] In embodiments using, e.g., syringes or ampoules having a
circular cross-section, the cover has a semi-circular cross section
with two side wall sections running substantially in a straight
line, as seen in cross-section. The side wall sections laterally
define an opening in the cover. The diameter of the semi-circular
section is adapted to the diameter of the fluid product reservoir.
The semi-circular section enables a structurally stable and
visually appealing cover. The length of the side wall sections is
selected such that, when the needle covering device is arranged
laterally on an injection device, the side walls of the fluid
product reservoir are supported by a side wall of the injection
device. In this way, the fluid product reservoir is held in a
structurally stable way. The opening angle of the opening can also
be selected such that the cover encompasses the fluid product
reservoir by more than 270.degree., so that a syringe or ampoule
can be supported in a cavity arranged in a side wall of the
injection device.
[0019] In one embodiment, the moveable portion of the cover is
preferably returned to the forward protective position by a
restoring element, such that the injection needle is always covered
in its resting state. At least one protrusion can be provided on
the cover to hold the restoring element. The protrusion meshes with
a longitudinal slit of the injection device and is guided in it
when retracted. The protrusion includes a trunnion or a comparable
mounting for the restoring element. The other end of the restoring
element is supported in the casing of the injection device. Thus,
when the cover is retracted, the restoring element is compressed
and the compression force of the spring thus increased. This
feature enables the injection device to be formed in a particularly
space-saving way.
[0020] Alternatively, in one embodiment, the cover can be formed as
one piece, wherein the cover interconnects with at least one guide
in the casing of the injection device and can be moved, that is
guided, relative to the casing.
[0021] In one embodiment, the cover is designed in at least two
pieces, and includes one or more covering elements that can be
longitudinally telescoped relative to one or more fixed portions.
The cover can be formed from two pieces, having a rear and a
forward element, each having at least one mutually corresponding
guide element, which co-operate to enable the forward element to be
guided when it is retracted. Guide elements in the form of grooves
and corresponding protrusions work well. In particular those having
a rectangular, circular or elliptical profile work well, since
these enable the elements to be easily joined together and arranged
in a mechanically stable way.
[0022] The rear covering element includes at least one attaching
element which serves to fixedly attach the rear element to an
injection device. Locking elements which can be non-detachably or
detachably locked into recesses or protrusions on an injection
device may be used. This allows the needle covering device to be
pre-assembled and then attached to an injection device as a module.
Alternatively, a needle covering device which is variable in length
within itself could also be formed as expansion bellows.
[0023] In one embodiment, the rear and forward portions of a
two-piece cover can each include at least one extended section
having a mounting or receptacle for holding a restoring element.
The restoring element, in particular a spring, can be supported in
a positionally and dimensionally stable way in the extended
section.
[0024] In one embodiment, the needle covering device includes at
least one latching means, to prevent the cover from retracting (or
advancing in some cases from either extreme position or any
intermediate position, if the latching means is in its latching
position. In this way, the cover can effectively be prevented from
being inadvertently retracted. Latching has also proven to be
advantageous in the retracted position of the cover, since the
cover then no longer has to be held back manually to replace the
fluid product reservoir. Rather the user has both hands free to
handle the reservoir.
[0025] In one embodiment, the mounting for the restoring element is
arranged outside the center of the needle covering device, when
seen in cross-section. In this way, a restoring force which acts
substantially at the center of the injection device can be
realized, even when the needle covering device is arranged
laterally on the injection device. The injection device therefore
needs merely to be placed substantially perpendicular on the tissue
and pressed down against the restoring force of the restoring
element. Since the restoring force acts substantially in the
center, the danger of the injection needle or the injection device
tipping or bending is effectively reduced.
[0026] The cover may be formed at least partially from a
transparent material, such that the level of the fluid product
reservoir and/or the state of the injection needle can be viewed.
In one embodiment, the forward end of the cover is opaque, such
that at least the forward end of the injection needle is not
visible, which otherwise could intimidate the user.
[0027] The needle covering device can be laterally attached to a
casing of an injection device.
[0028] When the cover of the injection needle includes two or more
pieces, receptacles for accommodating attaching elements may be
provided in a forward part of the casing of the injection device,
in order to securely attach the non-moving section of the cover to
the casing of the injection device. At least one longitudinal slit
can also be provided in the upper part, to guide a protrusion
provided on the longitudinally movable section of the cover.
[0029] The needle covering device may also be used to limit the
penetration depth of the injection needle into the tissue. To this
end, a stopper can be provided on the injection device or in the
needle covering device, for setting the penetration depth. This
stopper can be adjustable. In this way, an injection device with
even fewer components can be provided.
[0030] In one embodiment, a needle covering device includes a cover
which may be connected to the casing of the injection device and
has at least one section which may be moved relative to the casing
of the injection device, such that at least the forward end of the
injection needle is covered by it in a forward protective position,
and such that the forward end of the injection needle protrudes
from a forward end of the cover in a retracted position of the
cover, such that the non-covered art of the injection needle can be
injected into the tissue. Furthermore, the needle covering device
includes at least one guide element for guiding the cover or at
least the movable section of the cover when it is moved between the
forward protective position and the retracted position. A side wall
of the cover includes an opening at least at its forward end, said
opening enabling the fluid product reservoir and/or the injection
needle to be replaced, in the retracted position of the cover, and
at least hinders or as far as possible prevents them from being
replaced, in the forward protective position of the cover.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] FIG. 1 is a perspective view of an injection device with a
needle cover in a retracted position;
[0032] FIG. 2 is a perspective view of the injection device of FIG.
1, with the needle cover in the forward protective position;
[0033] FIG. 3 is a perspective view of the injection device of FIG.
1, without the needle cover;
[0034] FIG. 4 is a needle cover;
[0035] FIG. 5 is a perspective view of the injection device in
accordance with the first embodiment, in which the arrangement of
the restoring element is shown;
[0036] FIG. 6 is a perspective view of an injection device with a
needle cover in a retracted position;
[0037] FIG. 7 illustrates the injection device of FIG. 6, with the
needle cover in the forward protective position;
[0038] FIG. 8 illustrates the injection device of FIG. 6, without
the needle cover;
[0039] FIG. 9 is a perspective view of a needle cover in accordance
with a second embodiment of the present invention;
[0040] FIG. 10 illustrates the rear element of the needle cover of
FIG. 9; and
[0041] FIG. 11 illustrates the forward element of the needle cover
of FIG. 9.
DETAILED DESCRIPTION
[0042] In the figures, identical reference numerals indicate the
same or similar elements.
[0043] FIG. 1 is a perspective view of an injection device 1. The
injection device 1 has a needle cover 12 illustrated in a retracted
position. The injection device 1 includes a casing including a
forward part 2, a rear part 3, and a needle cover 12 connected to
the forward part 2. The injection device 1 also has a dosing wheel
6 for setting the fluid product dosage and an activating button 9
for injecting the fluid product. An electronic system can be
provided in the forward part 2, for controlling all the processes
of the injection device. An ampoule 10 is laterally supported on
the forward part 2.
[0044] As illustrated in FIG. 3, a recess formed by chamfers 18 and
an inner side 17 can be provided in the forward part 2, the recess
preferably being adapted to the shape of the ampoule 10. A rear end
of the ampoule 10 is screwed into the thread 22. The recess 23,
which a latching element can latch into, serves to position the
ampoule.
[0045] Other operational elements can be accommodated in the
forward part 2, in particular a dosing means and a counter and
display means, may be provided, for example, in the opening 5 of
the forward part 2 or on the rear part 3. In order to sufficiently
protect these elements from the environment, in particular from
dirt and moisture, the forward part 2 (or any portion of non-moving
casing portions) can be sealed against the environment. Since the
reservoir or ampoule 10 is laterally attached to the casing of the
injection device and the forward element 14 of the needle cover 12
can be moved, the reservoir or ampoule 10 can be replaced without
the forward part 2 or the other non-movable casing portions having
to be opened.
[0046] As illustrated in FIG. 1, the needle cover 12 is laterally
attached to the forward part 2. The needle cover 12 is designed in
two pieces and includes a positionally stable (i.e., non-moving
when attached to the injection device) rear element 13 connected to
the forward part 2. Cover 12 also includes a forward element 14
that is longitudinally movable relative to the rear element 13, of
which only the forward section 14a is visible in FIG. 1.
Alternatively, the needle cover 12 can also be formed as one or a
number of pieces. Where the needle cover 12 is formed as one piece,
it is appropriately guided and held in guide elements of the
forward part 2 of the casing.
[0047] With reference to FIGS. 1 and 2, the forward element 14 can
be longitudinally telescoped relative to the rear element 13 though
it does not matter which of the two elements surrounds the other in
the retracted position. To inject the fluid product, the forward
element 14 is retracted into the rear element 13 against the
restoring force of a restoring element (described below) until an
appropriate penetration depth is reached. This depth can be
predetermined (or maximized) by the forward end of the ampoule 10,
where the injection needle (not shown) is inserted into the opening
11. Alternatively, a stopper (not shown) is provided either in the
casing of the injection device or in the needle cover 12, to
adjustably predetermine the maximum retracted position of the
forward element 14.
[0048] As shown in FIG. 1, the forward end of the ampoule 10
protrudes beyond the forward end 4 of the forward part 2, such that
the ampoule 10 is easily accessible for removal.
[0049] The forward end of the ampoule 10 can instead end flush with
the forward end 4 or the forward end 4 can protrude beyond the
forward end of the ampoule 10. If the forward edge 15 of the
forward element 14 can be retracted back beyond the forward end of
the ampoule 10 (towards the rear element 13), for example, by at
least the width of a finger, such that the forward section of the
ampoule 10 is easily accessible for handling, the replacement of
ampoule 10 becomes easier.
[0050] As illustrated in FIG. 2, a guiding groove 16 is formed in
each of the two side walls 37 for guiding the forward element 14.
The guiding groove 16 runs substantially in a straight line, and
the grooves extend as far as the forward end of the forward element
14, but can also be limited by a collar at the rear end of the
forward element 14, in order to limit the forward extreme position
of the forward element 14. In this way, the forward element 14 and
rear element 13 can be joined together before the needle cover 12
is attached to the forward part 2.
[0051] As illustrated in FIG. 4, the guiding protrusion 24 meshes
with the guiding groove 16 and has a profile that is adapted to the
profile of the guiding groove 16. In order to form the guiding
groove 16, extended sections 32 are formed on the longitudinal
sides of the side walls 37, the guiding groove 16 being recessed in
said sections.
[0052] FIG. 4 also shows a perspective view of the needle cover 12
from the inside. Alongside the section 14a (which may be opaque to
limit viewing of the needle), the forward element 14 includes a
section 14b which may be transparent so that the level of the
ampoule and also the state of the injection needle can easily be
appraised from the outside.
[0053] A protrusion 25 is provided on the longitudinal side of a
side wall 37. The protrusion interconnects with the longitudinal
slit 20 shown in FIG. 3 and is guided in the slit 20 when the
forward element 14 is retracted. The forward extreme position of
the forward element 14 can be defined by the upper area of the
protrusion 25. To join the needle cover 12 together, the guiding
protrusion 24 is inserted into the guiding groove 16. The forward
extreme position of the forward element 14 can be limited at the
rear end of the guiding groove 16 by a heel (not shown).
[0054] As shown in FIG. 4, the elongated side walls 37 limit the
opening 35 provided in the needle cover 12. The opening 35 extends
substantially along the entire length of at least the
longitudinally movable section of the needle cover 12, i.e.,
substantially along the entire length of at least the forward
element 14. The non-moving rear element 13 attached to the
injection device 1 likewise includes a lateral opening 35. In
alternative embodiments, however, the non-moving element 13 can
also be formed by the casing or a part of the casing of the
injection device, in which case no lateral opening 35 needs to be
provided. The width of the opening 35 is selected to ensure that
the ampoule provided inside the needle cover 12 is appropriately
supported and covered and that the injection needle and/or the
ampoule is sufficiently easy to handle when the needle cover 12 is
retracted. The lateral opening 35 extends substantially along the
entire width of the needle cover 12, such that the opening angle of
the opening 35 is substantially 90.degree..
[0055] In the pre-assembled state, the needle cover 12 is placed on
the inner side 17 of the forward part 2 such that the protrusions
25 interconnect with the longitudinal slit 20 and the attaching
elements 27 interconnect with the recesses 21a, 21b provided in the
lateral edge of the inner side 17. The attaching elements 27 are
preferably locking elements which lock into the recesses 21. Other
appropriate detachable or non-detachable attaching techniques may
be utilized. The forward part 2 of the casing and the shell-shaped
needle covering device forms a closed or substantially closed
hollow cylindrical space. That is, the forward part 2 of the casing
closes the opening 35 in the needle covering device.
[0056] As shown in FIG. 4, each protrusion 25 comprises a trunnion
26 on which a spring 28 is placed. The spring 28, shown in FIG. 5,
serves as the restoring element for restoring the forward element
14. The other end of the spring 28 is placed on the trunnion 29
arranged on the base of the forward part 2. In order to assemble
the needle cover 12, the springs 28 are slipped onto the trunnions
29. The springs are appropriately pressed together, and the needle
cover 12 is placed on the inner side 17 of the forward part 2. The
protrusions 25 protrude into the longitudinal slit 20. The spring
28 is then relaxed and is slipped onto the trunnion 26. For
laterally guiding the spring 28, a longitudinal guide, e.g., a slip
on sleeve, can be provided in the inner side of the forward part
2.
[0057] An electronic control system can be provided to control the
injection device 1, and can be inserted into the forward part 2
through the opening 5 or can be situated in the rear part 3. The
injection device 1 is operated as follows. The forward edge 15 of
the needle cover 12 is placed on the tissue. The semi-circular
forward edge 15 and the side walls 37 ensure that the injection
device 1 is placed substantially perpendicular to the tissue and
that the injection needle is injected substantially perpendicular
into the tissue. This takes place in the forward protective
position of the needle cover 12 as shown in FIG. 2. In this
position, latching means (not shown) secure the forward element 14
of the needle cover 12, such that it cannot be retracted into the
rear element 13. Once the latching means are unlatched, the forward
element 14 can be retracted until a rear extreme position is
reached. The rear extreme position can be set by a stopper (not
shown) that can be provided in the casing of the injection device 1
or in the needle cover 12. By pressing an activating button 9 (or
other switch) the fluid product is injected into the tissue
mechanically or power-assisted, wherein a piston provided in the
ampoule 10 pushes fluid product through an injection needle (not
shown) into the tissue. The dose administered can be predetermined
by the dosing wheel 6 or by an electronic control system.
[0058] Once the fluid product has been administered, the injection
needle is extracted by withdrawing the injection device 1 from the
tissue. Due to the restoring force of the spring 28, this also
retracts the forward element 14 of the needle cover 12 until the
forward protective position is reached again. Once the latching
means are latched, the position of the forward element 14 is again
kept from moving so that the forward element 14 cannot be
inadvertently or unintentionally retracted.
[0059] In order to replace the ampoule 10, the forward element 14
can be retracted beyond the rear extreme position predetermined by
the stopper, so that the forward edge of the ampoule 10 can be
handled.
[0060] In order to secure the forward protective position of the
forward element 14, latching means (not shown) are provided which
in a first latching position prevent the forward element 14 from
being retracted into the rear element 13. When the latching means
are in a released position they allow the forward element 14 to be
retracted. Locking sliders, mechanical switches, or anti-twist
devices may optionally be integrated into the guiding groove 16 or
electromagnetic switches and the like can be provided.
[0061] FIGS. 6 to 11 illustrate another embodiment of a needle
covering device. FIG. 9 illustrates the forward element 14 and the
rear element 13. The guiding groove 30 does not extend along the
entire length of the forward element 14. Rather, a guiding stopper
34 is provided near the forward edge 15 where the guiding groove 30
terminates. The guiding stopper 34 establishes the extreme forward
position of the forward element 14. The guiding protrusion 31
interconnects with the guiding groove 30. The guiding protrusion 15
formed as a relatively short projection and is situated near the
forward edge of the rear element 13.
[0062] The rear element 13 includes two extended sections 32 on a
lower edge. The extended sections abut the extended sections 32 of
the forward element 14 to establish the rear extreme position of
the forward element 14.
[0063] As shown in FIGS. 10 and 11, recesses 33 are provided in the
extended sections 32 of each of the rear element 13 and the forward
element 14. The recesses serve to accommodate the spring 28 shown
in FIG. 9, which serves as the restoring element. A longitudinal
guide can be provided to stabilize the restoring element. The
longitudinal guide can be a sleeve which can be slid onto the
restoring element 28. In order to join the needle cover 12
together, the guiding protrusion 31 is inserted into the guiding
groove 30, then the forward element is moved to the forward extreme
position and then the spring 28 is inserted into the recesses
33.
[0064] The needle cover 12 is placed on the inner side 17 of the
forward part 2, as shown in FIG. 8. The attaching or locking
elements 27 interconnect with the recesses 21a, 21b provided on the
lateral edge 19 of the inner side. Longitudinal slits do not need
to be provided on the inner side 17 of the forward part 2. The
restoring springs 28 are not arranged in the forward part 2 of the
injection device, but rather integrated into the needle covering
device 12. The mountings for the restoring springs 28 are arranged
outside the center of the needle cover 12.
[0065] Although the invention has been described above in
connection with injection devices which inject the fluid product
from an elongated ampoule, the present invention is not limited to
such injection devices. Rather, the principle of laterally
arranging a needle cover on an injection device wherein the needle
cover can be applied to any shapes of fluid product reservoirs and
any designs of injection devices. In some embodiments, the needles
can be 30-guage or 31-guage needles.
[0066] While the movable casing and/or the needle cover immediately
surrounds the reservoir and/or injection needle in some
embodiments, a casing jacket may jointly encase the reservoir and
the injection needle, and the non-movable casing portions in other
embodiments. This casing jacket maybe movable in the manner of the
needle cover described above, that is in the axial direction of the
reservoir and/or the injection device.
[0067] Although the present invention has been described with
reference to preferred embodiments, persons skilled in the art will
recognize that changes may be made in form and detail without
departing from the spirit and scope of the invention.
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