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
  • A61M5/31—Details
  • A61M5/3129—Syringe barrels
• • 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
  • A61M5/3129—Syringe barrels
  • A61M5/3137—Specially designed finger grip means, e.g. for easy manipulation of the syringe rod
  • A61M2005/3139—Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips
• • 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
  • A61M5/31501—Means for blocking or restricting the movement of the rod or piston
  • A61M5/31505—Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
• • 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
  • A61M5/3287—Accessories for bringing the needle into the body; Automatic needle insertion

Definitions

• the invention relates to an injection device according to the preamble of claim 1.
• injection devices in their simplest form as a plastic pre-filled syringe with a syringe body, a cannula with a needle, a piston with a piston rod and a holding flange are known, which as a rule require proper handling, in particular when a subcutaneous injection is carried out Should, that is, if first the needle is to be inserted under the skin to a position as precisely defined as possible and only then is the drug to be injected.
• the object of the invention is to provide an interim solution in the sense that the two-stage method of operation mentioned at the outset is achieved by structurally simple additional devices by which the syringe itself is expanded.
• an operating mode of the injection device is selected in which it is ensured that the force applied to the piston rod by the patient either manually or by spring force is successively initially achieved in a plunge stroke in order to achieve the subcutaneous injection position and only afterwards in the injection stroke for the injection of the drug.
• the additional devices required for this include a coupling element, the task of which is to block a relative movement between the piston rod and the syringe body during the piercing stroke, and a guide element in which the syringe is displaceably held together with the coupling element and which has a release device on the inside thereof acts on the coupling element in such a way that the blocking of the piston rod is released after the insertion stroke has been carried out.
• FIG. 1 an exploded view of the first exemplary embodiment of the injection device according to the invention
• FIG. 2 shows a perspective illustration from two viewing angles of the injection device of FIG. 1 in the assembled state in the blocking position
• FIG. 3 detailed representations of the coupling element used in the exemplary embodiment according to FIG. 1 and FIG. 2,
• FIG. 4 two longitudinal sections rotated by 90 ° through the injection device in the blocking position
• Figure 5 three longitudinal sections in the plane of Figure 4B in the locked position, the
• Figure 6 a second embodiment of the injection device in the
• Figure 7 a third embodiment of the injection device in a first
• FIG. 8 the third exemplary embodiment in a second longitudinal section in the plane AA,
• FIG. 9 a rear view of the third exemplary embodiment
• FIG. 10 the third exemplary embodiment in longitudinal section corresponding to FIG. 7 after the piercing stroke has been carried out
• FIG. 11 the third embodiment in longitudinal section corresponding to FIG. 8 after the piercing stroke has been carried out
• Figure 12 the third embodiment in a first perspective view obliquely from the front
• Figure 13 the third embodiment in a first perspective view obliquely from behind.
• Figure 1 shows in the exploded view the three components of the first embodiment of the injection device according to the invention, namely a syringe 10 (in particular a commercially available disposable syringe), a guide element 20, for receiving the syringe body 11 and a protective cap 16 and a coupling element 30, which a releasable blocking between the flange 11A of the syringe body 11 and the piston rod 13 of the syringe 10 and which is also accommodated in the guide element 20.
• a syringe 10 in particular a commercially available disposable syringe
• a guide element 20 for receiving the syringe body 11 and a protective cap 16
• a coupling element 30 which a releasable blocking between the flange 11A of the syringe body 11 and the piston rod 13 of the syringe 10 and which is also accommodated in the guide element 20.
• FIG. 3 shows the construction of the coupling element 30 from a pocket-shaped plastic element with an injection-molded spring element 34, which has a pawl 33 which locks in the piston rod 13 under the pretension of the spring element 34 and thus the movement of the piston (injection stroke ) and thus blocked the injection of the drug.
• the guide element 20 consists of a tubular front section which encloses the front part of the syringe body 11 and the cannula with the protective cap 16 and, in particular in the blocking position shown in FIGS. 1 and 2, extends beyond the needle of the cannula, so that the needle is "masked".
• the rear part of the guide element 20 is widened and has a receiving space 24, in which the coupling element 30 is guided over the penetration stroke H1 and in which, after passing through the penetration stroke H1, a release device acts on the coupling element 30 perpendicular to the injection axis AA In such a way that the pawl 33 is disengaged from its latching action with the piston rod 13.
• the injection stroke H2 can take place at which, as usual, pushes the piston rod 13 with the piston 12 forward in the syringe body 11.
• the piston rod is designed as a profile part with a cross-shaped cross section. Suitable constrictions 13A '... 13D' are provided in the four longitudinal ribs 13A ... 13D of the piston rod 13 formed in this way, so that regardless of the rotational position of the piston rod 13 it is ensured that the pawl 33 is at least in one of these constrictions the action of the spring element 34 engages and the blocking takes place in the locked position. This locking position is shown in Figures 2,4 and 5A.
• the rear section of the guide element 20 has two diametrically opposite locking tongues 21A.21B, which fix the coupling element 30 in the locking position by means of holding cams 22A.22B or 23A.23B, as is particularly the case in FIG. 2 and FIG. 4A is removable.
• the receiving space 24 is designed in the manner of a truncated cone, in particular its inner cross section having a taper 26, which in the manner of an inclined plane acts on the edge region of the coupling element 30 in which the spring element 34 is accommodated.
• This taper 26 thus represents a very simple triggering device within the guide element 20, with the effect that the blocking of the piston rod 13 is released when the penetration stroke H1 is carried out.
• the dimensions of the tongues 21A.22A with their associated holding cams 22A, 22B or 23A.23B are selected such that for actuating the injection device, i.e. a minimum force must be applied to initiate the penetration stroke H1; this minimum force is expediently such that an unintentional actuation of the injection device is avoided and the opening of the latching tongues takes place so suddenly that the insertion stroke H1 takes place in a pulse-like manner under the effect of the minimum force, that is to say that the insertion process of the needle into the skin is very quick and therefore is performed safely and largely painlessly.
• the guide element 20 has an actuating flange 25, which functionally replaces the flange 11A of the syringe body 11.
• the coupling element 30 is pushed laterally onto the flange 11A of the syringe body 11 in such a way that the blocking described above between the syringe body 11 and the piston rod 13 occurs (FIG. 1).
• this assembly consisting of syringe 10 and coupling element 30 is pushed into the guide element 20 along the injection axis AA (arrow in FIG. 1), the guide element 20 and syringe 10 possibly being rotated radially relative to one another until the mutually coordinated cross sections of the receiving space 24 and the coupling element 30 allow the introduction into the entrance area of the receiving space 24 until after the spreading of the latching tongues 21A.21 B the use position of the injection device is reached, in which the protective cap 16 can be removed, but the needle of the syringe is still inside the tube. shaped front portion of the guide member 20 is secured ("masked"). This ready-to-use position of the injection device is shown in FIGS. 2, 4 and 5A, so the injection device will usually reach the customer or patient from the manufacturer, that is to say in the locked position of the injection device.
• the protective cap 16 is first removed and the injection device is placed vertically on the injection site.
• the index and middle fingers are placed on the actuating flange 25 and the thumb is pressed onto the flange plate 13E of the piston rod 13 (FIG. 5A).
• the injection device After the injection has taken place, the injection device is lifted from the injection site, the protective cap 16 is replaced and the syringe 10 is gripped on the flange plate 13E and completely pulled out of the guide element 20.
• the essential advantages of the injection device according to the invention thus lie in the transport safety (no unwanted actuation) and in the "masking" of the needle even when the protective cap 16 is removed, as long as the injection device is in the blocking position, so that the injection device can be placed firmly on the injection site, without a puncture already taking place, making it easier to define the exact location of the puncture site.
• the penetration depth can be clearly specified by the distance between the release device and the locking position of the coupling element, the design of the locking position with the aid of resilient locking tongues provides the additional advantage of the pulse-like insertion of the needle.
• FIG. 6 shows a sectional view through a second exemplary embodiment of an injection device according to the invention, in which a three-part structure is also provided, namely with injection syringe 10, guide element 20A and coupling element 30A, the latter two elements being constructed differently, but the basic function correspondingly remains as described under the first embodiment, so that only the structural differences will be briefly explained here:
• the coupling element 30A effects a coupling between the flange 11A and the flange plate 13E in the second exemplary embodiment. This positive connection is achieved by means of two locking tongues 31 A and 31 B.
• the receiving space 24A of the guide element 20A is designed as a cylindrical cavity lying coaxially to the syringe 10, into which the coupling element 30A can be inserted essentially completely for the execution of the penetration stroke H1 and injection stroke H2.
• the receiving space 24A has a guide groove 38A, 38B for the two holding tongues 31A.31 B, which the Holding tongues a component of motion across the injection axis AA impresses so that the coupling with the flange 11A is released.
• the penetration stroke H1 therefore merges seamlessly into the injection stroke H2.
• a minimum force for initiating the injection stroke is not defined, so that the speed and thus the duration of the injection process can be specified by the user or patient, which may make handling slightly more difficult, but may be desirable for special injection applications.
• latches can also be provided in this exemplary embodiment, which make it necessary to apply a minimum force to initiate the piercing stroke.
• the functioning of the second exemplary embodiment of the injection device according to the invention is functionally identical to that of the first exemplary embodiment, so that a further description can be dispensed with.
• FIGS. 7 to 13 show sectional representations and perspective representations of a third exemplary embodiment of the injection device according to the invention, which essentially differs from the two exemplary embodiments described above in that additional components are provided which permit an automatic mode of operation, that is to say in which the manual pushing in of the syringe for carrying out the injection stroke and then carrying out the injection stroke can be dispensed with, since this is achieved by spring force.
• the essential task of the power transmission to the syringe is taken over by a receiving sleeve 104, which in turn is axially displaceable in a housing 107, which is a rearward extension of a guide element 20B also provided here.
• the receiving sleeve 104 has two holding tongues 104A.104B pointing towards the rear end of the injection device, which can engage around the flange plate 13E of the piston rod 13 of the syringe 10.
• the receiving sleeve 104 is biased in the direction X (FIG.
• a release device 105 which has two diametrically opposite actuating buttons 105A.105B protruding from the guide element 20B.
• actuation buttons 105A.105B each have a locking tongue, the end face of which is supported against the end face of the receiving sleeve 104, as can be seen in particular from FIG. 8.
• the actuation buttons 105A.105B are in this case pivoted about a pin or a corresponding axis perpendicular to the plane of the drawing in FIG. 8 or FIG. 11.
• a plunger 109 is held parallel to the injection axis and is biased on the one hand by a first spring 11 in the injection direction and on the other hand is connected to a second spring 112 which acts against the first spring 111.
• a bell 110 is located in front of this plunger 109.
• an ejector device 103 which has a driver tongue 113 which is connected to one of the axially displaceable ejector handles 103A, 103B; two axial slots 103C.103D are provided in the guide element 20B for this purpose.
• the injection device works as follows:
• the receiving sleeve 104 is so far in its rearward position that its holding tongues 104A.104B are positioned in the housing 107 in such a way that they can be spread apart and the flange 13E of the syringe plunger 13 is inserted in its inwardly facing receiving groove can. If this flange 13E is fixed (FIG. 13), the injection device can be actuated. As in the first two exemplary embodiments, the coupling element 30B effects the fixed coupling with the piston rod 13 in this state, so that the piston 12 of the syringe 10 cannot be displaced.
• the protective cap 16 can now be removed and the injection device can be placed on the injection site. If the two actuation buttons 105A, 105B are then pressed simultaneously, their pawl moves out of the axial path of the receiving sleeve 104, so that the latter is pushed forward under the action of the roller spring 108 and first executes the piercing stroke. Towards the end of the penetration stroke, the coupling between the coupling element 30B and the piston rod 13 is also released in this exemplary embodiment, so that with further axial displacement of the receiving sleeve 104, the injection stroke now takes place, in which the piston 12 in the syringe 10 presses the injection liquid into the skin site.
• the plunger 109 which is biased by the first spring 111, is released from its latched position and strikes the bell 110, as a result of which an acoustic signal is generated.
• the second spring 112 causes the plunger 11 1 to lift off the bell 110 immediately after it strikes it, so that the bell 110 can swing freely and emit a clearly audible acoustic signal.
• the injection device is lifted from the injection site and the protective cap 16 is replaced.
• the ejector handles 103A.103B are pulled backward in their slots 103C.103D (direction Y, FIG. 13), so that the driver 113 brings the plunger 111 back into its initial detent position and the receiving sleeve 104 again against the force of the roller spring 108 is pushed back into its starting position until the actuating buttons 105A.105B snap back in front of the front annular shoulder of the receiving sleeve 104.

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)
• Injection Moulding Of Plastics Or The Like (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Polarising Elements (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8076610

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (22)

Citations (6)

Family Cites Families (7)

• 1999
  • 1999-07-24 DE DE29912965U patent/DE29912965U1/de not_active Expired - Lifetime
• 2000
  • 2000-07-12 JP JP2001511986A patent/JP4287611B2/ja not_active Expired - Fee Related
  • 2000-07-12 AT AT00952922T patent/ATE285260T1/de not_active IP Right Cessation
  • 2000-07-12 EP EP00952922A patent/EP1233801B1/de not_active Expired - Lifetime
  • 2000-07-12 US US10/031,565 patent/US6638255B1/en not_active Expired - Fee Related
  • 2000-07-12 DE DE50009063T patent/DE50009063D1/de not_active Expired - Fee Related
  • 2000-07-12 WO PCT/DE2000/002274 patent/WO2001007105A1/de not_active Ceased
  • 2000-07-12 PT PT00952922T patent/PT1233801E/pt unknown
  • 2000-07-12 AU AU65568/00A patent/AU6556800A/en not_active Abandoned
  • 2000-07-12 ES ES00952922T patent/ES2232475T3/es not_active Expired - Lifetime

Patent Citations (6)

Also Published As

Similar Documents

Legal Events