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
  • A61M5/30—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M2005/2073—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically preventing premature release, e.g. by making use of a safety lock
• • 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
  • A61M5/50—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 preventing re-use, or for indicating if defective, used, tampered with or unsterile

Definitions

• the invention relates to an injection device for injecting a liquid, in particular a medicament, into a subcutaneous tissue, with an ampoule body, with a chamber arranged in the ampoule body and having an opening, with an ampoule piston for reducing the volume of the chamber, with a movable one Spring element biased pressure piece against a holding element and with a trigger for moving the holding element from a first position holding the pressure piece into a second position releasing the movement of the pressure piece and with a basic body for holding the trigger and for guiding the pressure piece in the second Position holding element against an end of the ampoule piston facing away from the chamber.
• Such an injection device is known from WO 98/15307.
• the ampoule body having the chamber is screwed into the base body.
• the basic body has a bearing for the trigger made in one piece with the holding element.
• the holding element swings out of the range of movement of the pressure piece.
• the force of the spring then moves the pressure piece against the end of the ampoule piston protruding from the chamber.
• the pressure piece is beabstan ⁇ d et from the free end of the ampoule bulb. This ensures that when the trigger is actuated, the pressure piece is provided with an intended pulse hits the free end of the ampoule bulb.
• the liquid in the chamber then exits the opening as a high-pressure jet.
• the liquid passes through the skin into the subcutaneous tissue.
• a needle penetrating the skin for introducing a medicament into the subcutaneous tissue is therefore not necessary.
• the depth of penetration of the liquid and the shape of the high-pressure jet can be measured by the shape and dimensions of the opening in relation to the dimensions of the chamber and by the characteristic curve of the spring.
• a damping element is arranged in the basic body, which dampens the impact of the pressure piece at the end of the movement of the ampoule piston.
• the ampoule body is separated from the base body together with the ampoule bulb.
• the pressure piece, the trigger and the holding element are moved back to their starting positions by means of a charging station. Then a new or a newly filled ampoule body can be screwed onto the base body.
• the injection device is thus prepared for a new injection.
• a disadvantage of the known injection device is that it is very expensive to manufacture.
• the basic body is made of easy-to-clean stainless steel.
• the spring member is sized to a thousand ermudungs- free tension and relaxation for several Add j ections and thus made of a very intensive technicallyin ⁇ material.
• Hal ⁇ teelement to slide along in the drawing lots to the pressure stucco a very high material strength and sliding doughs ⁇ shaft, to enable the repeated use of the Injetechnischsein ⁇ direction to avoid the pressure stucco accidental lots.
• an injection device has become known from practice, in which the force required for generating the pressure jet is applied by a gas filling.
• This injection device is f o r single use designed and therefore requires no after use aufwandige cleaning.
• a chamber receiving the intended gas filling is very difficult to manufacture.
• This injection device is therefore very expensive to manufacture.
• a time-dependent escape of the gas from the gas filling and thus a reduction in pressure cannot be avoided.
• the invention is based on the problem of an in j edictions adopted to make the aforementioned type so that it is particularly inexpensive to manufacture.
• This design allows particularly inexpensive materials to be used for the individual components of the injection device according to the invention.
• Material fatigue of the spring element generally only begins after a large number of injections and, thanks to the invention, does not lead to a change in the intensity of the high-pressure jet.
• the holding element can also be made of a particularly inexpensive material with a low strength.
• the injection device according to the invention does not require a damping element. ment to limit the movement of the pressure piece. As a result, the injection device according to the invention is particularly cost-effective.
• the prevention of further injections after the first use can optionally be designed in such a way that a component is destroyed during the first use or that the injection device according to the invention cannot be prepared for a new use without detailed design knowledge and tools.
• the injection device according to the invention can be delivered in the tensioned state, so that no cost-intensive tensioning device is required.
• the means for preventing further injections after the first use are structurally particularly simple if the ampoule body is inseparably connected to the base body after assembly.
• the base body ⁇ is made of plastic. Since cleaning of the base body at least in the dung need intended for single Ge ⁇ injection device thanks to the OF INVENTION ⁇ is not required, the base body can have almost any surface roughness. To further reduce the costs of the injection device according to the invention in the case of large numbers of pieces, it contributes if the basic body made of plastic is manufactured by injection molding.
• the trigger can be pivoted.
• the mounting can be easily installed if the mounting of the trigger has a bearing shell that is open on one side.
• the trigger is held axially displaceably in a guide of the base body transverse to the direction of movement of the pressure piece.
• the trigger can simply be inserted into the guide.
• This assembly can also be carried out immediately before the injection, so that a securing element to avoid unintentional actuation of the trigger is not required.
• Such guides can be easily provided in the manufacture of the base body by injection molding.
• the trigger is structurally particularly simple if the trigger has a pressure plate which can be displaced perpendicularly to the direction of movement of the pressure piece and an arm which surrounds the basic body and is arranged in the guide.
• the holding element could, for example, be pivotally mounted on the base body and deflected by the arm of the trigger.
• the injection device according to the invention ricntung requires particularly few components if the holding element is fastened to the end of the trigger arm facing away from the pressure plate and penetrates a wall of the base body in the region of an opening.
• the ampoule body could be screwed to the base body.
• the base body has a snap-in connection for holding an ampoule body having the chamber. In this way, for example, the ampoule body can only be connected to the base body immediately before the injection. This significantly reduces the risk of the liquid escaping from the ampoule body if the trigger is accidentally actuated.
• the latching connection between the base body and the ampoule body is structurally particularly simple if the base body has latching hooks on its end facing the ampoule body for engaging behind a side of a collar of the ampoule body facing away from the spring element.
• a separation of the ampoule body from the base body can be done according to another advantageous development. Avoid fertilization of the invention reliably when em locking ring engages around the outside of the locking hook in the assembled state of the ampoule body. This prevents the catch hook from bending away from the ampoule body.
• the disassembly of the locking ring and thus the possible separation of the ampoule body from the base body is reliably prevented according to another advantageous development of the invention if the locking ring has at least one radially inward-pointing hook for its positive connection with the ampoule body or the base body in the over the locking hook located position.
• the use of the injection device according to the invention is particularly convenient if the base body has a stop intended to limit the axial mobility of the ampoule body in the direction pointing towards the pressure piece.
• the spring element could be adjusted at its end opposite the pressure piece on an adjustable Trim the screw.
• a cap attached to the base body and supporting the spring element at the end opposite the pressure piece contributes.
• the cap can be made of plastic by injection molding.
• connection of the cap to the base body has a snap-in connection.
• the number of components of the injection device according to the invention can be kept particularly low if the basic body for receiving the spring element and the pressure piece is designed in the shape of a pot.
• the injection device according to the invention can be completely preassembled with trigger and ampoule body.
• a securing device to prevent unintentional actuation of the trigger is structurally particularly simple if the securing element holding the trigger is held in the position blocking the movement of the trigger with an intended force.
• the securing element can be designed as a tear-off part and can be thrown away after being pulled out of the gap.
• the locking ring is displaceably guided on the base body and the locking element is arranged on the locking ring. It contributes to a further reduction in the production costs of the injection device according to the invention if the pressure piece is made of steel by the extrusion process
• FIG. 1 shows a longitudinal section through an injection device according to the invention before an injection
• FIG. 2 shows a sectional view through the injection device from FIG. 1 along the line II-II,
• FIG. 3 shows a longitudinal section through the injection device according to the invention from FIG. 1 after an injection
• FIG 5 shows the injection device from FIG. 4 after the first use.
• the ampoule body 2 has a chamber 9 with an opening 10 for receiving a liquid, in particular a medicament, which is to be injected into em subcutaneous tissue.
• the chamber 9 can be reduced in size by an ampoule piston 11 which can be moved slowly relative to the ampoule body 2.
• the connection of the ampoule body 2 to the base body 1 has a latching connection 12 with latching hooks 13, 14 arranged on the base body 1 and a stop 15.
• the latching hooks 13, 14 engage behind a collar 16 of the ampoule body 2 and hold the latter on the stop 15.
• the latching hooks 13, 14 have an introduction collar 17, 18 forming a funnel 19 arranged at one end of the base body 1 with the base body 1, the ampoule body 2 with the collar 16 can be impressed into the end of the base body 1 which has the latching hooks 13, 14.
• the locking hooks 13, 14 spring radially outwards and engage behind the collar 16 as soon as it comes against the stop 15.
• FIG. 1 further shows that the basic body 1 has a guide 20 for the ampoule piston 11.
• the holding element 6 holding the pressure piece 4 in its drawn position is connected to a trigger 21.
• the trigger 21 has an arm 23 connected to a pressure plate 22.
• the pressure plate 22 and the Garelemen t 6 are arranged on opposite side of the base body 1 so that upon displacement of the pressure plate 22 in the direction of the base body 1, the holding element is moved out 6 from the leadership 3 for the pressure stucco. 4
• An inadvertent movement of the pressure plate 22 is prevented by a securing element 24. prevents.
• the securing element 2 ⁇ is clamped in a gap 25 between the pressure plate 22 and the base body 1 and has a tension strip 26.
• the securing element 24 can be gripped on the pull strip 26 and pulled out of the gap 25.
• the securing element 24 is first removed and the injection device with the opening 10 of the ampoule body 2 is printed on the skin. Subsequently, the holding element 6 is moved by pressing the pressure plate 22 from its drawn-in first position into a second position outside the guide 3 of the pressure piece 4, and thus the movement of the pressure piece 4 is released.
• the pressure piece 4 is accelerated by the force of the spring element 5 against the end of the ampoule piston 11 facing away from the chamber 9 and presses it into the chamber 9.
• the liquid in the chamber 9 passes through the opening 10 as a high-pressure jet.
• the intensity of the high-pressure jet, and thus the depth of penetration of the liquid into the subcutaneous tissue can be determined by the dimensions of the opening 10 in relation to the dimensions of the chamber 9 and by Set the characteristic curve of the spring element 5.
• Figure 2 shows the injection device of figure 1 m a sectional view taken along II - II of Figure 1. It can be seen that the shutter button 21 a total of two, j in each case in Guided Tours 27, 28 of the base body 1 arranged arms 23, has 29th The holding member 6 penetrates the base body 1 in an opening 30. To assemble the Auslosers 21 with the base body 1, for example, the arms 23 are pushed over the parent compound 1 29 bent outwardly from one end and above. The arms 23, 29 then rest in the guides 27, 28 em.
• the trigger 21 or the basic body 1 can also be designed in two parts and glued or clipped together during assembly.
• FIG 3 shows the injection device of Figure 1 after use. It can be seen here that the holding element 6 is in the second position, which releases the movement of the pressure piece 4.
• the pressure piece 4 lies against a stop 31 of the base body 1.
• the ampoule bulb 11 is pushed against the end of the ampoule body 2 which has the opening 10. Since the latching connection 7 of the cap 8 with the base body 1 is not accessible from the outside, the pressure piece 4 and the spring element 5 in the base body 1 are kept virtually inaccessible from the outside. Furthermore, it is very difficult to separate the ampoule body 2 from the base body 1, since the latching hooks 13, 14 point radially inwards.
• the base body 1 is made of plastic, a violent separation of the ampoule body 2 or the cap 8 from the base body 1 also leads to damage to the latching connections 7, 12. This largely prevents the spring element 5 from being re-tensioned and the ampoule body 2 being replaced.
• FIG. 4 shows an injection device with a pot-shaped base body 32 and an ampoule body 33 which is latched to the base body 32.
• the base body 32 receives pressure piece 35 preloaded from a spring element 34 in the direction of the ampoule body 33 and is in one piece with a bearing shell 36 which is open on one side manufactured.
• a trigger 37 is pivotally mounted with a holding element 38 supporting the pressure piece 35.
• FIG. 4 also shows that a retaining ring 39 is axially displaceably guided on the base body 32.
• E securing element 40 which is made in one piece with the locking ring 39, supports in .. J -
• the base body 32 has latching hooks 41 with a stop 43 spaced apart from them for holding a collar 44 of the ampoule body 33.
• the position of the locking ring 39 shown in FIG. 4 indicates the position in which the injection device can be transported.
• the securing ring 39 has a radially inwardly pointing hook 45, with which it penetrates into a correspondingly designed recess 46 of the base body 32. The hook 45 can be moved out of the recess 46 with a force that is to be exerted on the locking ring 39 in the axial direction.
• the locking ring 39 is first pushed away from the trigger 37 so that the locking element 40 comes out of the range of motion of the trigger 37.
• the trigger 37 can then be depressed, so that the pressure piece 35 is moved by the force of the spring element 34 against an ampoule piston 47 of the ampoule body 33.
• This position is shown in Figure 5.
• the locking ring 39 is here in the position pushed over the locking hooks 41 of the base body 32 and prevents it from bending open.
• the hook 45 arranged on the locking ring 39 snaps between two locking hooks 41 of the base body 32 and thus prevents the locking ring 39 from being pushed back.
• the injection device can be adapted by using appropriately designed pressure pieces 35 and spring elements 34.
• the basic body 32, the trigger 37 and the locking ring 39 can be used unchanged in all of the ampule bodies 33 which are common in medicine.
• the basic body 32, the trigger 37 and the locking ring 39 made of plastic can be produced in an injection molding process in particularly large numbers and thus particularly cost-effectively.

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)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7929284

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (11)

Citations (4)

Family Cites Families (5)

• 1999
  • 1999-11-16 DE DE1999155201 patent/DE19955201A1/de not_active Withdrawn
• 2000
  • 2000-04-15 DE DE20006986U patent/DE20006986U1/de not_active Expired - Lifetime
  • 2000-11-14 CN CN 00815750 patent/CN1390146A/zh active Pending
  • 2000-11-14 DE DE10083482T patent/DE10083482D2/de not_active Expired - Fee Related
  • 2000-11-14 AU AU25021/01A patent/AU2502101A/en not_active Abandoned
  • 2000-11-14 JP JP2001538017A patent/JP2003513762A/ja active Pending
  • 2000-11-14 EP EP00988585A patent/EP1229952A1/de not_active Withdrawn
  • 2000-11-14 WO PCT/DE2000/003953 patent/WO2001036028A1/de not_active Application Discontinuation
  • 2000-11-15 TW TW89124147A patent/TW496747B/zh not_active IP Right Cessation
  • 2000-11-16 AR ARP000106044 patent/AR030035A1/es not_active Application Discontinuation

Patent Citations (4)

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