CA2314089C - Needle arrangement - Google Patents
Needle arrangement Download PDFInfo
- Publication number
- CA2314089C CA2314089C CA002314089A CA2314089A CA2314089C CA 2314089 C CA2314089 C CA 2314089C CA 002314089 A CA002314089 A CA 002314089A CA 2314089 A CA2314089 A CA 2314089A CA 2314089 C CA2314089 C CA 2314089C
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- CA
- Canada
- Prior art keywords
- cap
- needle
- hollow needle
- carrier
- needle carrier
- 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.)
- Expired - Lifetime
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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
- A61M5/46—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 having means for controlling depth of 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3202—Devices for protection of the needle before use, e.g. caps
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
-
- 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
- A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
- A61M2005/3104—Caps for syringes without needle
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
- A61M2005/3267—Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body
-
- 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
- A61M2205/59—Aesthetic features, e.g. distraction means to prevent fears of child patients
-
- 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
- A61M5/002—Packages specially adapted therefor, e.g. for syringes or needles, kits for diabetics
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
- A61M5/3271—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position
Abstract
A needle arrangement for an injection device (16) has a cannula carrier (10) to which a cannula (12) is secured and which is designed to be removably secured to the injection device (16). The needle arrangement has a cap (32) which can slide on the cannula carrier (10) in an approximately parallel direction to the length of the cannula (12), is provided at its proximal end section with a through hole (42) for the cannula (12) and in its proximal end position covers the cannula (12). A pressure spring (26) is arranged between the cannula carrier (10) and the cap (32) for moving the cap (32) into its proximal end position. Also provided is a covering cap (66) which encloses the sliding cap (32), the cannula (12) and the cannula carrier (10), and is closed in a sterile manner by a closure member (71) which can be removed by a user from the open side of the covering cap (66).
This needle arrangement can be easily replaced after an injection. It improves compliance because the patient never sees the cannula (12). The pressure spring can be designed as a plastic spring (26). It preferably forms a single piece with the cannula carrier (10), thus simplifying manufacture.
This needle arrangement can be easily replaced after an injection. It improves compliance because the patient never sees the cannula (12). The pressure spring can be designed as a plastic spring (26). It preferably forms a single piece with the cannula carrier (10), thus simplifying manufacture.
Description
NEEDLE ARRANGEMENT
1 The invention relates to a needle arrangement for an injection device.
1 The invention relates to a needle arrangement for an injection device.
2 A needle arrangement of this kind is known from EP 0 749 758 A1.
3 In it, a hollow needle that is mounted on a hollow needle holder is used.
4 The latter is screwed onto an external thread at the proximal end of the injection device. A special apparatus which makes the hollow needle invisible to the user, 6 so as to eliminate his or her anxiety regarding injections, is then slid over this 7 hollow needle.
8 It is the object of the invention to make available a new needle arrangement 9 for an injection device.
According to the invention, a needle arrangement is provided for an 11 injection device, having a hollow needle carrier on which a hollow needle is 12 mounted and which is configured for mounting on an injection device, having a 13 first cap which is arranged on the hollow needle carrier and is displaceable 14 approximately parallel to the longitudinal extension of the hollow needle between a distal and a proximal end position, is formed at its proximal end segment with 16 a passage for the hollow needle, and in its proximal end position substantially 17 conceals the hollow needle. The arrangement further has a compression spring 18 arranged between the hollow needle carrier and the first cap, for displacing the 19 first cap into its proximal position. A second cap is also included. It is adapted to surround said displaceable first cap, the hollow needle and the hollow needle 21 carrier. The second cap has a user-removable protective barrier closing off an 22 open side of said second cap, whereby said second cap and said protective barrier 23 together form a sterile enclosure around said first cap, said hollow needle and 24 said needle carrier.
A needle arrangement of this kind is very easy to utilize, since in practice 26 it uses nothing more than a replaceable hollow needle. Easy adjustment of the 27 penetration depth is also achieved, since the necessary penetration depth may be 28 different depending on the patient's constitution. In this instance, it can be 29 adjusted easily and obviously.
The arrangement of this kind has only a few parts and thus can be produced 31 very economically. It can be used by the patient in a simple, easily 32 understandable fashion.
33 Also, the inventive arrangement can very easily be kept sterile until used.
34 The covering cap is usable as an assembly aid, additionally facilitating use by the patient.
36 Each time the patient thrusts the hollow needle in prior to an injection, 37 the displaceable cap is displaced in the distal direction against the force of the 38 spring, and when the hollow needle is pulled out it moves back into its proximal 39 end position under the action of the spring, so that the patient does not see the hollow needle during the entire injection procedure. Because of the detachable 1 mounting on the injection device, a needle arrangement of this kind can very 2 easily replaced, after an injection, with a new, sterile needle be arrangement.
3 Fur ther details and advantageous developments of the invention are evident 4 from the exemplary embodiment, which is described below and depicted in the drawings and is in no way to be understood as a limitation of the invention, and 6 from the dependent claims. In the drawings:
7 FIG. 1 is a longitudinal section through a preferred embodiment of a needle 8 arrangement according to the present invention, in an exploded and 9 greatly magnified depiction;
FIG. 2 shows a view similar to that of FIG. 1 but in the assembled state, the 11 hollow needle being concealed by the arrangement;
12 FIG. 3 shows a view similar to that of FIG. 2 but with the needle thrust in, the 13 penetration depth being labeled D;
14 FIG. 4 shows a view similar to that of FIG. 2, additionally depicting an outer covering cap 66 which serves to encase the needle arrangement in sterile 16 fashion;
17 FIG. 5 shows a view of a complete, packaged needle arrangement according to a 18 preferred embodiment of the invention;
19 FIG. 6 is a plan view looking in the direction of arrow VI of FIG. 5;
FIG. 7 is a view showing the adjustment of the penetration depth by way of the 21 external covering cap 66;
22 FIG. 8 is a sectional view along line A-A of FIG. 7;
23 FIG. 9 is a sectional view along line B-B of FIG. 7; and 24 FIG. 10 is a sectional view through a defined break point for a stop element, viewed along line C-C of FIG. 7.
1 In the description that follows, the terms "proximal" and "distal" will be 2 used in the manner usual in medicine, to wit:
3 "proximal" = facing toward the patient (the end of the injection 4 device having the needle);
"distal" = facing away from the patient.
6 FIG. 1 shows, on the left, a hollow needle carrier 10 made of a suitable 7 plastic, e.g. polyethylene. Secured in this is a hollow needle (injection 8 needle) 12 whose distal end 14 serves to pierce through the rubber membrane 9 (not depicted) on the reservoir of an injection device 16 that is indicated only schematically in FIGS. 2 and 3.
11 An internal thread 20 of hollow needle 10, which is delimited in the 12 proximal direction by a shoulder 22 serving as a stop, provides detachable 13 mounting on an external thread (also referred to as "a needle carrier) 18 at 14 the proximal end of injection device 16.
The proximal segment of hollow needle 12 is labeled 24. Extending 16 concentrically around it, in the arrangement as shown in FIG. 1, is a plastic 17 compression spring 26 that can be configured integrally with hollow needle 18 carrier 10 and that here comprises two helical springs or spirals 26a, 26b, 19 offset 180°, which each transition at their proximal end into a ring 28 with which they can also be integrally configured. Alternatively a separate spring, 21 for example made of metal, could also be used here.
22 A first sleeve or first cap 32 has a substantially cylindrical segment 34 23 whose cylindrical outer side is labeled 33 and whose cylindrical inner side 24 is configured for sliding displacement on the (also cylindrical) 1 circumference 36 of hollow needle carrier 10. First cap 32 furthermore has at 2 its proximal end a base 40 in whose center is located a recess or passage 42 3 through which proximal end 24 of hollow needle 12 can pass during an injection, 4 as shown in FIG. 3.
First cap 32 has on its inner side 35 a total of three longitudinal 6 grooves 44, only two of which are visible in FIG. l, uniformly distributed on 7 the circumference and providing axial guidance, i.e. rotation prevention.
They 8 coast with three projections 45, complementary thereto, on the cylindrical 9 outer circumference 36 of hollow needle carrier 10, as clearly shown by FIGS. 2 and 3.
11 First cap 32 furthermore has three barbs 46 on its inner circumference 12 35. These barbs are also uniformly distributed on the circumference, and coast 13 with three corresponding complementary barbs 48 on outer circumference 36 of 14 hollow needle 10, only one of which is visible in FIG. 1. During assembly, barbs 46 slide over barbs 48 so that parts 10 and 32 are joined to one another 16 nondetachably but axially displaceably; barbs 46, 48 form a stop in the 17 proximal direction, as depicted in FIG. 2, and grooves 44 coast with the 18 complementary projections or 45 to provide rotation preventer for first cap 32, 19 so that the latter cannot rotate relative to hollow needle carrier 10.
As clearly shown in FIGS. 1 through 3, there is located on outer 21 circumferential 36 of hollow needle carrier 10 a stop arrangement 50 against 22 whose proximal shoulder 52 (as shown in FIG. 3) first cap 32 comes to rest with 23 its distal end 53 when hollow needle 12 is thrust with its proximal end 24 into 24 a body part 54 (indicated only schematically).
Stop arrangement 50 has here a distal stop element 56, a central stop 26 element 58, and a proximal stop element 60. At least proximal stop element 27 and central stop element 58 are each joined integrally to hollow needle carrier 28 10 by way of a defined break point 76 (F'IG. 10), and consequently can be broken 29 off from hollow needle carrier 10 by the user. This increases insertion depth D
(FIG. 3) of the proximal hollow needle portion 24. Thus either it is possible 31 to break off only stop element 60, so that first cap 1 32 then comes to rest against a shoulder 61 when hollow needle 12 is thrust in;
2 or both stop elements 58 and 60 can be broken off, in which case first cap 3 then comes to rest against a shoulder 62 when hollow needle 12 is thrust in.
In 4 the latter case, the maximum penetration depth is attained.
FIG. 4 shows, at left, hollow needle carrier 10 on whose circumference 6 stop elements 56, 58, 60 and 56, 58', 60, 56", etc. are arranged at uniform 7 spacings of 120°. FIG. 6 shows the three stop elements 56, 56', and 56" in a 8 plan view according to arrow VI of FIG. 5.
9 FIG. 4 shows that an outer covering cap, also referred to as "a second cap" 66, which provides sterile covering of the needle arrangement, is also 11 provided. Outer covering cap 66 is depicted in FIG. 4 partially in longitudinal 12 section, and it is evident that its cylindrical inner recess 68, which in the 13 case of the complete needle arrangement shown in FIGS. 5 and 6 is slid over the 14 cylindrical outer side 33 of first cap 32, has three longitudinal grooves which are distributed uniformly on the circumference of inner recess 68 and are 16 dimensioned such that they can be slid over stop elements 56, 58, 60, 56', 58', 17 60', 56" etc., as is particularly clearly evident from FIG. 6.
18 FIG. 5 also shows a protective film (also referred to as "a user-19 removable protective barrier" 71 with which, in the complete needle arrangement, the opening (FIG. 5, left) of outer covering cap 66 can be sealed 21 in sterile fashion. This film is welded on or adhesively bonded on, and is torn 22 off before use. Film 71 is not depicted in FIG. 6.
23 FIG. 7 shows how outer covering cap 66 can be slid axially onto first cap 24 32 in the direction of arrow 72, arriving at a position 66' which is indicated in FIG. 7 with dot-dash lines and is depicted in section in FIG. 8, and in 26 which its longitudinal grooves 70 are in engagement with stop elements 60, 60', 27 60". If outer covering cap 66 is then rotated in the direction of rotation 28 arrow 74 depicted in FIG. 7, stop elements 60, 60', 60" are broken off along 29 their defined break points 76 (cf. FIG. 10), i.e. penetration depth D (FIG.
3) is correspondingly increased in the manner already described above. In the same 31 manner, it is also possible to break 1 off both stop elements 58, 60 (correspondingly 58', 60', etc.), and thereby to 2 increase penetration depth D even further.
3 What is described is thus a needle arrangement for an injection device 4 16. It has a hollow needle carrier 10 on which a hollow needle 12 is mounted and which is configured for detachable mounting on injection device 16. The 6 arrangement has a cap 32 that is arranged on hollow needle carrier l0 7 displaceably approximately parallel to the longitudinal extension of hollow 8 needle 12, is equipped at its proximal end segment with a passage 42 for hollow 9 needle 12, and in its proximal end position substantially conceals hollow needle 12. A compression spring 26 is arranged between hollow needle carrier 11 and cap 32 in order to displace cap 32 into its proximal end position. Also 12 provided is a covering cap 66 which surrounds the displaceable cap 32, hollow 13 needle 12, and hollow needle carrier 10, and on its open side is sealed in 14 sterile fashion by a tear-off sealing member 71. A needle arrangement of this kind can easily be replaced after an injection. It improves compliance because 16 the patient does not at any time see hollow needle 12. The compression spring 17 can be configured as plastic spring 26 having a proximal end in the form of a 18 ring. It is preferably integral with hollow needle carrier 10, which simplifies 19 manufacture.
Many other variants and modifications are, of course, also possible 21 within the scope of the present invention.
8 It is the object of the invention to make available a new needle arrangement 9 for an injection device.
According to the invention, a needle arrangement is provided for an 11 injection device, having a hollow needle carrier on which a hollow needle is 12 mounted and which is configured for mounting on an injection device, having a 13 first cap which is arranged on the hollow needle carrier and is displaceable 14 approximately parallel to the longitudinal extension of the hollow needle between a distal and a proximal end position, is formed at its proximal end segment with 16 a passage for the hollow needle, and in its proximal end position substantially 17 conceals the hollow needle. The arrangement further has a compression spring 18 arranged between the hollow needle carrier and the first cap, for displacing the 19 first cap into its proximal position. A second cap is also included. It is adapted to surround said displaceable first cap, the hollow needle and the hollow needle 21 carrier. The second cap has a user-removable protective barrier closing off an 22 open side of said second cap, whereby said second cap and said protective barrier 23 together form a sterile enclosure around said first cap, said hollow needle and 24 said needle carrier.
A needle arrangement of this kind is very easy to utilize, since in practice 26 it uses nothing more than a replaceable hollow needle. Easy adjustment of the 27 penetration depth is also achieved, since the necessary penetration depth may be 28 different depending on the patient's constitution. In this instance, it can be 29 adjusted easily and obviously.
The arrangement of this kind has only a few parts and thus can be produced 31 very economically. It can be used by the patient in a simple, easily 32 understandable fashion.
33 Also, the inventive arrangement can very easily be kept sterile until used.
34 The covering cap is usable as an assembly aid, additionally facilitating use by the patient.
36 Each time the patient thrusts the hollow needle in prior to an injection, 37 the displaceable cap is displaced in the distal direction against the force of the 38 spring, and when the hollow needle is pulled out it moves back into its proximal 39 end position under the action of the spring, so that the patient does not see the hollow needle during the entire injection procedure. Because of the detachable 1 mounting on the injection device, a needle arrangement of this kind can very 2 easily replaced, after an injection, with a new, sterile needle be arrangement.
3 Fur ther details and advantageous developments of the invention are evident 4 from the exemplary embodiment, which is described below and depicted in the drawings and is in no way to be understood as a limitation of the invention, and 6 from the dependent claims. In the drawings:
7 FIG. 1 is a longitudinal section through a preferred embodiment of a needle 8 arrangement according to the present invention, in an exploded and 9 greatly magnified depiction;
FIG. 2 shows a view similar to that of FIG. 1 but in the assembled state, the 11 hollow needle being concealed by the arrangement;
12 FIG. 3 shows a view similar to that of FIG. 2 but with the needle thrust in, the 13 penetration depth being labeled D;
14 FIG. 4 shows a view similar to that of FIG. 2, additionally depicting an outer covering cap 66 which serves to encase the needle arrangement in sterile 16 fashion;
17 FIG. 5 shows a view of a complete, packaged needle arrangement according to a 18 preferred embodiment of the invention;
19 FIG. 6 is a plan view looking in the direction of arrow VI of FIG. 5;
FIG. 7 is a view showing the adjustment of the penetration depth by way of the 21 external covering cap 66;
22 FIG. 8 is a sectional view along line A-A of FIG. 7;
23 FIG. 9 is a sectional view along line B-B of FIG. 7; and 24 FIG. 10 is a sectional view through a defined break point for a stop element, viewed along line C-C of FIG. 7.
1 In the description that follows, the terms "proximal" and "distal" will be 2 used in the manner usual in medicine, to wit:
3 "proximal" = facing toward the patient (the end of the injection 4 device having the needle);
"distal" = facing away from the patient.
6 FIG. 1 shows, on the left, a hollow needle carrier 10 made of a suitable 7 plastic, e.g. polyethylene. Secured in this is a hollow needle (injection 8 needle) 12 whose distal end 14 serves to pierce through the rubber membrane 9 (not depicted) on the reservoir of an injection device 16 that is indicated only schematically in FIGS. 2 and 3.
11 An internal thread 20 of hollow needle 10, which is delimited in the 12 proximal direction by a shoulder 22 serving as a stop, provides detachable 13 mounting on an external thread (also referred to as "a needle carrier) 18 at 14 the proximal end of injection device 16.
The proximal segment of hollow needle 12 is labeled 24. Extending 16 concentrically around it, in the arrangement as shown in FIG. 1, is a plastic 17 compression spring 26 that can be configured integrally with hollow needle 18 carrier 10 and that here comprises two helical springs or spirals 26a, 26b, 19 offset 180°, which each transition at their proximal end into a ring 28 with which they can also be integrally configured. Alternatively a separate spring, 21 for example made of metal, could also be used here.
22 A first sleeve or first cap 32 has a substantially cylindrical segment 34 23 whose cylindrical outer side is labeled 33 and whose cylindrical inner side 24 is configured for sliding displacement on the (also cylindrical) 1 circumference 36 of hollow needle carrier 10. First cap 32 furthermore has at 2 its proximal end a base 40 in whose center is located a recess or passage 42 3 through which proximal end 24 of hollow needle 12 can pass during an injection, 4 as shown in FIG. 3.
First cap 32 has on its inner side 35 a total of three longitudinal 6 grooves 44, only two of which are visible in FIG. l, uniformly distributed on 7 the circumference and providing axial guidance, i.e. rotation prevention.
They 8 coast with three projections 45, complementary thereto, on the cylindrical 9 outer circumference 36 of hollow needle carrier 10, as clearly shown by FIGS. 2 and 3.
11 First cap 32 furthermore has three barbs 46 on its inner circumference 12 35. These barbs are also uniformly distributed on the circumference, and coast 13 with three corresponding complementary barbs 48 on outer circumference 36 of 14 hollow needle 10, only one of which is visible in FIG. 1. During assembly, barbs 46 slide over barbs 48 so that parts 10 and 32 are joined to one another 16 nondetachably but axially displaceably; barbs 46, 48 form a stop in the 17 proximal direction, as depicted in FIG. 2, and grooves 44 coast with the 18 complementary projections or 45 to provide rotation preventer for first cap 32, 19 so that the latter cannot rotate relative to hollow needle carrier 10.
As clearly shown in FIGS. 1 through 3, there is located on outer 21 circumferential 36 of hollow needle carrier 10 a stop arrangement 50 against 22 whose proximal shoulder 52 (as shown in FIG. 3) first cap 32 comes to rest with 23 its distal end 53 when hollow needle 12 is thrust with its proximal end 24 into 24 a body part 54 (indicated only schematically).
Stop arrangement 50 has here a distal stop element 56, a central stop 26 element 58, and a proximal stop element 60. At least proximal stop element 27 and central stop element 58 are each joined integrally to hollow needle carrier 28 10 by way of a defined break point 76 (F'IG. 10), and consequently can be broken 29 off from hollow needle carrier 10 by the user. This increases insertion depth D
(FIG. 3) of the proximal hollow needle portion 24. Thus either it is possible 31 to break off only stop element 60, so that first cap 1 32 then comes to rest against a shoulder 61 when hollow needle 12 is thrust in;
2 or both stop elements 58 and 60 can be broken off, in which case first cap 3 then comes to rest against a shoulder 62 when hollow needle 12 is thrust in.
In 4 the latter case, the maximum penetration depth is attained.
FIG. 4 shows, at left, hollow needle carrier 10 on whose circumference 6 stop elements 56, 58, 60 and 56, 58', 60, 56", etc. are arranged at uniform 7 spacings of 120°. FIG. 6 shows the three stop elements 56, 56', and 56" in a 8 plan view according to arrow VI of FIG. 5.
9 FIG. 4 shows that an outer covering cap, also referred to as "a second cap" 66, which provides sterile covering of the needle arrangement, is also 11 provided. Outer covering cap 66 is depicted in FIG. 4 partially in longitudinal 12 section, and it is evident that its cylindrical inner recess 68, which in the 13 case of the complete needle arrangement shown in FIGS. 5 and 6 is slid over the 14 cylindrical outer side 33 of first cap 32, has three longitudinal grooves which are distributed uniformly on the circumference of inner recess 68 and are 16 dimensioned such that they can be slid over stop elements 56, 58, 60, 56', 58', 17 60', 56" etc., as is particularly clearly evident from FIG. 6.
18 FIG. 5 also shows a protective film (also referred to as "a user-19 removable protective barrier" 71 with which, in the complete needle arrangement, the opening (FIG. 5, left) of outer covering cap 66 can be sealed 21 in sterile fashion. This film is welded on or adhesively bonded on, and is torn 22 off before use. Film 71 is not depicted in FIG. 6.
23 FIG. 7 shows how outer covering cap 66 can be slid axially onto first cap 24 32 in the direction of arrow 72, arriving at a position 66' which is indicated in FIG. 7 with dot-dash lines and is depicted in section in FIG. 8, and in 26 which its longitudinal grooves 70 are in engagement with stop elements 60, 60', 27 60". If outer covering cap 66 is then rotated in the direction of rotation 28 arrow 74 depicted in FIG. 7, stop elements 60, 60', 60" are broken off along 29 their defined break points 76 (cf. FIG. 10), i.e. penetration depth D (FIG.
3) is correspondingly increased in the manner already described above. In the same 31 manner, it is also possible to break 1 off both stop elements 58, 60 (correspondingly 58', 60', etc.), and thereby to 2 increase penetration depth D even further.
3 What is described is thus a needle arrangement for an injection device 4 16. It has a hollow needle carrier 10 on which a hollow needle 12 is mounted and which is configured for detachable mounting on injection device 16. The 6 arrangement has a cap 32 that is arranged on hollow needle carrier l0 7 displaceably approximately parallel to the longitudinal extension of hollow 8 needle 12, is equipped at its proximal end segment with a passage 42 for hollow 9 needle 12, and in its proximal end position substantially conceals hollow needle 12. A compression spring 26 is arranged between hollow needle carrier 11 and cap 32 in order to displace cap 32 into its proximal end position. Also 12 provided is a covering cap 66 which surrounds the displaceable cap 32, hollow 13 needle 12, and hollow needle carrier 10, and on its open side is sealed in 14 sterile fashion by a tear-off sealing member 71. A needle arrangement of this kind can easily be replaced after an injection. It improves compliance because 16 the patient does not at any time see hollow needle 12. The compression spring 17 can be configured as plastic spring 26 having a proximal end in the form of a 18 ring. It is preferably integral with hollow needle carrier 10, which simplifies 19 manufacture.
Many other variants and modifications are, of course, also possible 21 within the scope of the present invention.
Claims (16)
1. A needle arrangement for an injection device having a hollow needle carrier on which a hollow needle is mounted and which is configured for mounting on an injection device;
having a first cap which is arranged on the hollow needle carrier and is displaceable approximately parallel to the longitudinal extension of the hollow needle between a distal and a proximal end position, is formed at its proximal end segment with a passage for the hollow needle, and in its proximal end position substantially conceals the hollow needle;
having a compression spring, arranged between the hollow needle carrier and the first cap, for displacing the first cap into its proximal end position;
having a second cap adapted to surround said displaceable first cap, said hollow needle and said hollow needle carrier, and having a user-removable protective barrier closing off an open side of said second cap, whereby said second cap and said protective barrier together form a sterile enclosure around said first cap, said hollow needle and said needle carrier.
having a first cap which is arranged on the hollow needle carrier and is displaceable approximately parallel to the longitudinal extension of the hollow needle between a distal and a proximal end position, is formed at its proximal end segment with a passage for the hollow needle, and in its proximal end position substantially conceals the hollow needle;
having a compression spring, arranged between the hollow needle carrier and the first cap, for displacing the first cap into its proximal end position;
having a second cap adapted to surround said displaceable first cap, said hollow needle and said hollow needle carrier, and having a user-removable protective barrier closing off an open side of said second cap, whereby said second cap and said protective barrier together form a sterile enclosure around said first cap, said hollow needle and said needle carrier.
2. The needle arrangement as defined in claim 1, wherein said hollow needle carrier is formed with an internal thread for engagement with an external thread formed on a surface of an associated injection device.
3. The needle arrangement as defined in claim 1, wherein said cover cap has a form adapted for transfer of torque to said hollow needle carrier.
4. The needle arrangement as defined in claim 3, wherein said cover cap is shaped for form-locking engagement with said hollow needle carrier.
5. The needle arrangement according to claim 1 , wherein said user-removable protective barrier is a peelable foil bonded across said open side of said second cap.
6. The needle arrangement according to claim 1, wherein an outer surface of said hollow needle carrier is formed with at least two stop elements serving to limit axial displacement of said first cap, said stop elements being frangible from said needle carrier at respective break points formed therein.
7. The needle arrangement according to claim 6, wherein the cover cap has a form adapted to influence at least one stop member formed on an outer surface of said hollow needle carrier in order to set a penetration depth of said needle.
8. The needle arrangement as defined in claim 7, wherein the at least one stop member is mounted on the hollow needle carrier via a defined break point at which said stop member can be broken off by a rotational motion of the covering cap brought into engagement with said stop member.
9. The needle arrangement as defined in claim 6, wherein said break point serves as a axial guide for displacement of said first cap relative to said hollow needle carrier.
10. The needle arrangement according to claim 1, wherein the first cap is arranged displaceably on a substantially cylindrical circumferential surface of the hollow needle carrier, and a rotation preventer is provided between the hollow needle carrier and the first cap.
11. The needle arrangement according to claim 10, wherein said rotation preventer includes a longitudinal groove, formed on one of said first cap and said needle carrier, and a complementary projection, adapted to engage in said groove, formed on the other of said first cap and said needle carrier.
12. The needle arrangement according to claim 1, wherein said compression spring is formed of plastic material.
13. The needle arrangement as defined in claim 12, wherein said plastic spring is formed integrally with said needle carrier.
14. The needle arrangement according to claim 12, wherein said plastic spring has a proximal end formed as a ring, said ring engaging against said first cap and urging said cap in a proximal direction.
15. The needle arrangement as defined in claim 14, wherein the ring is formed integrally with said plastic spring.
16. The needle arrangement as defined in claim 12, wherein the plastic spring includes a pair of helical spring elements, each formed integrally with said hollow needle carrier.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29720513.7 | 1997-11-19 | ||
| DE29720513 | 1997-11-19 | ||
| PCT/EP1998/007230 WO1999025402A1 (en) | 1997-11-19 | 1998-11-11 | Needle arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2314089A1 CA2314089A1 (en) | 1999-05-27 |
| CA2314089C true CA2314089C (en) | 2006-02-21 |
Family
ID=8048832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002314089A Expired - Lifetime CA2314089C (en) | 1997-11-19 | 1998-11-11 | Needle arrangement |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6203529B1 (en) |
| EP (1) | EP1032446B2 (en) |
| JP (1) | JP2001523485A (en) |
| AT (1) | ATE265873T1 (en) |
| CA (1) | CA2314089C (en) |
| DE (3) | DE29825212U1 (en) |
| DK (1) | DK1032446T3 (en) |
| WO (1) | WO1999025402A1 (en) |
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- 1998-11-11 JP JP2000520835A patent/JP2001523485A/en active Pending
- 1998-11-11 EP EP98962331.9A patent/EP1032446B2/en not_active Expired - Lifetime
- 1998-11-11 DE DE29825212U patent/DE29825212U1/en not_active Expired - Lifetime
- 1998-11-11 US US09/530,894 patent/US6203529B1/en not_active Expired - Lifetime
- 1998-11-11 CA CA002314089A patent/CA2314089C/en not_active Expired - Lifetime
- 1998-11-11 AT AT98962331T patent/ATE265873T1/en active
- 1998-11-11 DE DE29820166U patent/DE29820166U1/en not_active Expired - Lifetime
- 1998-11-11 WO PCT/EP1998/007230 patent/WO1999025402A1/en active IP Right Grant
- 1998-11-11 DE DE59811344T patent/DE59811344D1/en not_active Expired - Lifetime
- 1998-11-11 DK DK98962331T patent/DK1032446T3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DK1032446T3 (en) | 2004-06-14 |
| EP1032446A1 (en) | 2000-09-06 |
| DE29820166U1 (en) | 1999-03-25 |
| WO1999025402A1 (en) | 1999-05-27 |
| ATE265873T1 (en) | 2004-05-15 |
| EP1032446B1 (en) | 2004-05-06 |
| CA2314089A1 (en) | 1999-05-27 |
| DE59811344D1 (en) | 2004-06-09 |
| DE29825212U1 (en) | 2006-03-16 |
| JP2001523485A (en) | 2001-11-27 |
| US6203529B1 (en) | 2001-03-20 |
| EP1032446B2 (en) | 2013-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181113 |