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
  • A61M5/50—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
  • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-rod

Definitions

• the present invention relates to a hypodermic syringe. More particularly, it relates to a non-reusable syringe whose embodiment includes a rod that is designed to be capable of reciprocating forward and backward relative to a container whose one end consists of, or can interact with, a needle, and whose opposite end is open; a piston that interacts with the end of the rod that protrudes into the container; a means for connecting and disconnecting the piston from the end of the rod; at least two guide and glide surfaces, having a longitudinal orientation along the edges of the rod.
• the aim of the present invention is to offer a non-reusable syringe, which means that a liquid that is meant to be injected may be drawn into the container via the needle, after which the enclosed liquid can be emptied from the container via the needle, whereafter the syringe may not be used again for filling and emptying.
• the present invention relates to a syringe whose means for connecting and disconnecting the piston with the rod enters a connecting state when the piston of the rod is drawn from a position in the immediate proximity of the needle to a remote position, relative to the needle, and is brought to a disconnecting or disconnected state when the piston of the rod is pressed towards the needle.
• the means for connecting and disconnecting the piston from the rod is made up of an abutment on the end of the rod that protrudes towards the needle, which abutment belongs to the support and/or glide surfaces that are designed to interact with corresponding support and glide surfaces on the piston while the rod is prevented from rotating about a central axis that is common to the rod and the container, through means of control, belonging to the container, that prevents said rod from rotating.
• non-reusable syringes of the kind described above may be divided into a number of categories of function.
• a first category can be exemplified by a hypodermic syringe whose ingoing rod is designed to be rotated relative to the container and the piston, so that on the one hand, by means of the rotating rod, a connecting and disconnecting means can enter into a connecting position or state, whereas on the other hand the means can enter a disconnecting or disconnected position or state.
• the conditions for this category of syringes requires the piston not to twist, or at least not while the rod rotates relative to the container.
• a second category of non-reusable syringes makes use of a forward and backward reciprocating rod or rod unit that does not rotate in the container, and a piston or piston unit that is attached to the rod.
• the external surface of the piston and the internal surface of the container are equipped with an interacting organ that, in an interacting state, locks the piston in a bottom position.
• a third category of non-reusable syringes makes use of a forward and backward reciprocating rod unit that does not rotate in the container, and a piston unit that is attached to the rod unit via a special binding part.
• the binding part is here rotatably connected to the rod, where a rotation about a centre line that is common to the rod, the piston, and the container, may be regulated by tracks in the piston unit.
• Another technical problem is in being able to realise how these conditions may be provided without having to add, for that specific purpose, details that require additional materials to the design of the syringe.
• Another technical problem is in being able to realise how the guide and glide surfaces can be created on the rod.
• Another technical problem is in realising how, by simple means, corresponding guide and glide surfaces can be created in the container's inner jacket surface, arranged to run against said guide and glide surfaces of the rod.
• Still another technical problem is in realising how the guide and glide surfaces created in said container ought to be positioned in order interact with said guide and glide surfaces of the rod, thereby preventing a rotation about the centre line that is common to the rod and the container when the rod reciprocates forward and backward, relative to the container.
• Another technical problem is in being able to realise how these two guide and glide surfaces need to be positioned on the rod and in the container, in order to prevent the rod from rotating.
• Another technical problem is in being able to realise which possible production techniques and simplifications might are provided by using four guide and glide surfaces on the rod and in the container respectively, as well as how these need to be positioned relative to one another in order to obtain the desired simplification.
• Another technical problem is in being able to realise the significance of positioning the guide and glide surfaces of the container close to the container's open end.
• Yet another technical problem is in being able to realise how long the guide and glide surfaces of the container need to be in order to permit an effective method of production.
• Another technical problem is in being able to realise how opportunities may be provided for preventing the rod and its associated piston, or a means for connecting or disconnecting said piston, from being removed from the container so that the piston and rod can be reconnected after it has been used, thereby ensuring that the syringe may only be used once.
• a non-reusable syringe that includes a rod, designed to be capable of reciprocating forward and backward relative to a container whose one end consists of, or can interact with, a needle, and whose opposite end is open; a piston that interacts with the end of the rod that protrudes into the container; a means for connecting and disconnecting the piston from the end of the rod; at least two guide and glide surfaces, having a longitudinal orientation along the edges of the rod.
• the invention proceeds from and is based on the concept that said connecting and disconnecting means enters a connecting state when the piston of the rod is drawn from a position in the immediate proximity of the needle to a remote position, relative to the needle, and is brought into a disconnecting or disconnected state when the piston of the rod is pressed to- wards the needle.
• Said means for connecting or disconnecting the piston from the rod is made up of an abutment on the end of the rod that protrudes towards the needle, which abutment belongs to the support and/or support surfaces that are arran ⁇ ged to interact with corresponding support and/or glide sur- faces on the piston.
• the basis for the invention lies in the function of the connecting and disconnecting means, which requires that said rod be prevented from rotating about a central axis that is common to the rod and the contai ⁇ ner. Rotation is prevented by a means of control in the con- tainer.
• the present inven ⁇ tion shows that said means of control is made up in part by at least two embossments, or similar means, in an external sur- face of said container's jacket.
• Each embossment forms a guide and glide surface in the inner surface of said container's jacket.
• the guide and glide surfaces of said rod are arranged to run adjacent to, or towards, the guide and glide surfaces of said container, thereby causing the rod to move in a linear manner relative to the container.
• Said means of control is obtained during a given step in the production of the container and the syringe. However, this step does not require adding, or the use of, additional com- ponents or materials.
• the cross section of said rod is made up of wings, such as the wings of two intersecting planes.
• the invention shows that guide and glide surfaces of said rod may consist of some said planes' or wings' peripheral edge surfaces.
• the invention shows that the guide and glide surfaces of said rod need only be two in number, and that these should be situated on opposing edges of one of said planes, and on the same side of said plane.
• the invention shows that if the rod is equipped with guide and glide surfaces as described above, then the guide and glide surfaces in the container need only be two in number, preferably located on opposite sides of said container, immediately adjacent to, and on the same side as the guide and glide surfaces of said rod, in order to ensure the desired linear movement.
• the current invention also shows that the guide and glide sur ⁇ faces of said rod may be two in number, and located on the same edge of one of said planes, and on opposite sides of said plane.
• guide and glide surfaces of the container need only be two in number, located on the same side of said container, immediately adjacent to, and on opposite sides of the planes—and their guide and glide surfaces—that belong to said rod, in order to ensure the desired linear movement.
• the invention shows that the guide and glide surfaces of said rod may be four in number, located in pairs facing one another on opposing edges of one of said planes, and that the two guide and glide surfaces within each pair must be located facing each other on opposite sides of said planes.
• the invention shows that the guide and glide surfaces of said container must also be four in number, located in pairs that face one another on opposite sides of said container, and that the two guide and glide surfaces within each pair must be located immediately adjacent to, and on opposing sides of, the planes—and their guide and glide surfaces—that belong to said rod.
• the invention shows that the position of said means of control on said container is close to the open end of said container.
• the length of the guide and glide surfaces of said means of control is between eight and twelve millimetres, preferably ten millimetres, so that, although they do not occupy more of the container than is necessary, they do nonetheless ensure a simple embossment whose results are lasting and whose guide and glide surfaces, which are formed from the embossment are adequately precise.
• the present invention shows that the cross- section surface of said rod's abutment, which protrudes towards the needle, is slightly less than the cross-section surface of said container, thereby permitting said abutment to pass freely into said container up to the point of the embossments.
• the rod cannot be drawn past the embossments, it cannot be completely drawn out of said container.
• the prime advantage that can be associated with a non-reusable syringe, according to the present invention, is that a simple method is obtained for regulating and controlling that a rod that belongs to the syringe cannot twist or be rotated about a centre line that is common to the container, the rod and the piston when the rod reciprocates forward and backward, rela- tive to the container, by simply forming the container, during the manufacturing process, with a number of embossments.
• the guide and glide surfaces which are formed within the contai ⁇ ner, regulate or control that the rod does not rotate.
• Figure 1 is a side view of a non-reusable syringe according to the present invention.
• Figure 2 shows in perspective view, a rod that belongs to a non-reusable syringe
• Figure 3 is an enlarged cross-sectional view according to the line II-II in Figure 2;
• Figure 4 is an enlarged cross-sectional view according to the line I-I in Figure 1;
• Figure 5 is a cross-sectional view, according to Figure 4, of an alternative embodiment of the present invention.
• Figure 6 is a cross-sectional view, according to Figure 4, of yet another alternative embodiment of the present invention.
• Figure 7 is a cross-sectional view of several possible cross sections of rods that can be used in a non-reusable syringe, according to the present invention.
• the present invention is not limited to that particular embodiment, but can be used whenever the purpose is to regulate, in a syringe, a rod's linear movement relative to the container.
• Figure 1 shows a non-reusable syringe 1, according to the present invention, that includes a rod 2, designed to be capable of reciprocating forward and backward relative to a container 3.
• the container's one end 31 consists of, or can interact with, a needle 11.
• the container's opposite end 32 is open.
• the syringe 1 also includes a piston 12 that interacts with the end of the rod that protrudes into the container, and a means 13 for connecting and disconnecting the piston from the end of the rod.
• Said means 13 for connecting and disconnecting the piston from the end of the rod enters a connecting state when the piston 12 of the rod 2 is drawn from a position in the immediate proximity of the needle 11 to a remote position, relative to the needle, and is brought into a disconnecting or disconnec- ted state when the piston 12 of the rod 2 is pressed towards the needle 11.
• Said means 13 for connecting and disconnecting the piston from the rod is made up of an abutment 21 on the end of the rod 2 that protrudes towards the needle 11, which abutment belongs to the support and/or glide surfaces that are arranged to interact with corresponding support and/or glide surfaces on the piston 12.
• the above connecting and disconnec ⁇ ting function requires that said rod 2 be prevented from rota ⁇ ting about a central axis A that is common to the rod and the container.
• connecting and disconnecting function is not an important function of the present invention, it will not be described in greater detail in this publication. Instead, the present invention may serve as a means for obtaining a satis ⁇ factory function of previously described connecting and dis ⁇ connecting means 13.
• the present invention relates primarily to the container's 3 means of control 4, which prevents said rod 2 from rotating.
• the that belongs to the syringe is gene ⁇ rally made up in part of two intersecting wings or planes 22, 23.
• the end of the rod that faces into the container 3 ends with a transverse section 21, and the opposite end ends with a thumb support 24.
• the present invention shows that the rod 2 is equipped with at least two guide and glide surfaces that have a longitudinal orientation along the edges or the rod.
• the guide and glide surfaces of the rod might be made up of the outer edge sections 22a, 22b on the wing or the plane, according to Figure 3.
• Figure 4 shows that said means of control 4 consists of two embossments 41, 42 in an external surface 33 of said contai- ner's 3 jacket.
• Each embossment 41, 42 forms a guide and glide surface 41a, 42a in the inner surface 34 of said container's 3 jacket.
• the guide and glide surfaces 22a, 22b of the rod 2 are arran ⁇ ged to run towards the guide and glide surfaces 41a, 42a of said container 3.
• the present invention shows that the correct placement of said embossments creates guide and glide surfaces that can interact with the guide and glide surfaces of said rod, thereby preven ⁇ ting the rod from rotating about a central axis or line "A" that is common to the rod and the container, when the rod reciprocates forward and backward relative to the container.
• Figure 3 shows that a number of surfaces on the rod can be used as guide and glide surfaces.
• a number of surfaces on the rod can be used as guide and glide surfaces.
• guide and glide surfaces 22a and 22b we see guide and glide surfaces 22a and 22b.
• guide and glide surfaces 22c and 22d on the opposite side and on opposing edges of plane 22 we see guide and glide surfaces 22c and 22d.
• the plane 23 can be said to contain the guide and glide surfaces 23a, 23b, 23c and 23d.
• Figure 4 shows an embodiment whose guide and glide surfaces 22a, 22b of the rod 2—which are located on the same side but on opposing edges of one of the planes 22 of the rod 2—inter ⁇ act with the guide and glide surfaces 41a, 42a of the conta ⁇ iner—which are located on opposing sides of said container 3, immediately adjacent to, and on the same side of, said rod's 2 plane 22 and its guide and glide surfaces 22a, 22b.
• a clockwise rotation of the rod 2 is pre- vented by the two guide and glide surfaces 22b and 42a, where ⁇ as a counter-clockwise rotation is prevented by the two guide and glide surfaces 22a and 41a.
• Figure 5 shows an embodiment whose container 3 is equipped with two embossments 41' and 43, which form guide and glide surfaces 41a' and 43a.
• the guide and glide surfaces 22a, 22c of the rod 2 which are located on the same edge, but on opposing sides of one of the rod's 2 planes 22, interact with the guide and glide surfaces 41a', 43 of the container, which are located on the same side of the container 3, immediately adjacent to, and on opposite sides of the rod's 2 plane 22 and its guide and glide sur ⁇ faces 22a, 22c.
• a clockwise rotation of the rod 2 is pre ⁇ vented by the two guide and glide surfaces 22c and 43a, where ⁇ as a counter-clockwise rotation is prevented by the two guide and glide surfaces 22a and 41a' .
• Figure 6 shows an embodiment that has four guide and glide surfaces on the rod and in the container respectively.
• the guide and glide surfaces 22a, 22b, 22c, 22d of the rod are four in number, located in pairs (22a, 22c and 22b, 22d) facing each other on opposing edges of one of the rod's 2 planes 22, and that the two guide and glide sur- faces within each pair are located facing one another on opposite sides of said plane.
• 42', 43', 44 are located in pairs (42a'', 43a' and 42a', 44a) facing each other on opposing sides of the container.
• the two guide and glide surfaces within each pair are located immedi ⁇ ately adjacent to, and on opposite sides of the rod's 2 plane 22 and its guide and glide surfaces 22a, 22b, 22c, 22d.
• a clockwise rotation of the rod 2 is pre ⁇ vented by the four guide and glide surfaces 22c, 43a', 22b, 42a' , whereas a counter-clockwise rotation is prevented by the four guide and glide surfaces 22a, 41a'', 22d, 44a.
• Additional embossments can be made so that combinations of guide and glide surfaces of the container correspond to some of the guide and glide surfaces of the rod, as shown in Figure 3.
• a rod 7d may consist of a cylinder ⁇ like body 7dl with a wing-shaped projection 7d2 that facili ⁇ tates the guide and glide surfaces 7d2a and 7d2b.
• the other examples, 7a, 7b, 7c show a cross section of rods, all of which facilitate several possible guide and glide surfaces.
• Figure 1 shows that the sectional area of the rod's 2 abutment 21, at the end of the rod that extends towards the needle 11, is designed to be slightly less than the sectional area of the container 3.
• the rod 2 and its transverse end section 21 can run freely within said container 3 up to the point of the means of control 4, which are made up of embossments in the external surface 33 of the container's 3 jacket.
• This design gives the container 3 a locally-related reduced sectional area, which in turn means that the section 21 cannot pass this area, thereby preventing the rod 2 from being completely drawn out of the container 3.
• Figure 1 also shows that the position on the container of said means of control 4 is close to the container's open end 32, in order to give the rod 2 the greatest amount of stroke "B" within the container 3.
• the guide and glide surfaces of said means of control are allocated a length "C" that is between eight and twelve milli ⁇ metres, preferably ten millimetres.
• the length "C” should not be longer than this, otherwise it would limit the rod's stroke "B" in the container 3. Neither should the length be shorter than prescribed above; otherwise the guide and glide surface for the rod 2 may not provide adequate stability and control.
• the embossments described above are formed of extruder core that presses the container material in towards the edge or edges of the rod's planes or wings.
• said planes can function as a bucker during the embossment.
• the recoiling properties of the container's material create the gap that is needed between the various guide and glide sur ⁇ faces to obtain a free movement of the rod.

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• 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)

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Applications Claiming Priority (2)

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ID=20399072

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Country Status (3)

Cited By (1)

Citations (1)

• 1995
  • 1995-07-26 SE SE9502697A patent/SE504013C2/sv not_active IP Right Cessation
• 1996
  • 1996-07-22 AU AU64748/96A patent/AU6474896A/en not_active Abandoned
  • 1996-07-22 WO PCT/SE1996/000967 patent/WO1997004825A1/en active Application Filing

Patent Citations (1)

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