DE1161389B - Injection device - Google Patents

Description

.SUNDAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: A 61 m

German class: 30 k -3/02

Number: 1161 389

File number: O 8914 IXd / 30 k

Filing date: August 7, 1962

Opening day: January 16, 1964

The invention relates to the subcutaneous injection of fluids and relates to a device for the mechanical injection of drugs or the like into a human or animal body.

Prefilled, sterile, easy-to-use units designed for subcutaneous injection Doses in the form of compressible sleeves or ampoules containing the desired liquid are filled and contain a hypodermic needle in the sleeve, are already known to clean and To facilitate rapid subcutaneous injection of serum or the like. This consists of the shell or ampoule made of a flexible plastic material that contains the exact amount of medication for an injection. A hypodermic needle is also contained in the sheath. If such an ampoule is placed on the Placed on the patient's skin and exerted pressure against the outer surface of the ampoule, it is pressed collapses the hollow sheath, thereby causing the needle to pierce through the wall of the sheath the patient's body and at the same time emptying the drug through the needle.

To reduce the inconvenience of the injection for the patient and the procedure, in particular in mass treatments of large groups of people, it is desirable that compressing the ampoule and sticking the needle with one quickly and evenly exerted force takes place.

In order to achieve this, the following structure is proposed for the injection device according to the invention. The injection device according to the invention consists of the following parts: a housing structure; one arranged in the housing construction so as to be movable in the ampoule injection and retrieval direction Ampoule injection pusher; one movable at a distance from the injection plunger in the housing structure lying spring slide; an arrangement for connecting the injection plunger and the spring tensioning slide with a dead walk; one between the injection plunger and the spring slide lying, acting against the injection plunger and both pushing apart compression spring; one with one end to the spring slide and the other end to the housing structure lying toggle lever arrangement; an operating handle acting on the toggle lever arrangement, which, when moved in one direction, moves the spring slide in the return direction and, if it is moved in the opposite direction, moves the spring tensioning slide in the tensioning direction; a locking device for a detachable injection device

Applicant:

The Otto Konigslow Mfg. Company,
Cleveland, Ohio (V. St. A.)

Representative:

Dipl.-Ing. L. Hirmer, patent attorney,
Berlin-Halensee, Katharinenstr. 21

Named as inventor:

Walter Karl Blumenstein, Fairview Park, Ohio, Anthony David, Cleveland, Ohio (V. St. A.)

Claimed priority:

V. St. v. America 7 August 1961

(No. 129 763)

Locking the injection plunger against movement caused by the spring; one through the Handle operated device for triggering the locking device.

The invention is explained in more detail below with reference to the drawings using an exemplary embodiment explained.

F i g. 1 shows a vertical section through the housing an injection device substantially along the line 1-1 in Fig. 4 and represents the device with a position of the parts when ready, with the cocked plunger released, the ampoule compressed and the needle is advanced;

FIG. 2 shows one essentially of that in FIG. 1 same view, but shows the parts in the position they occupy in the retracted position, with the handle swung outward to move the plunger into its return position, however, the spring is not yet stretched;

F i g. 3 is a view similar to FIG. 1 and 2, however, shows the parts in the position that they are in tensioned Assume position, the spring actuating the plunger by moving the actuating handle is clamped to the housing while the plunger remains in its retracted clamping position;

309 779/11

F i g. FIG. 4 is a bottom plan view taken generally along line 4-4 in FIG. 1 toward the point shown in FIG F i g. 1 to 3 device shown;

F i g. Figure 5 is a horizontal cross-section taken along line 5-5 in Figure 1;

F i g. Figure 6 is a horizontal cross-section taken along line 6-6 in Figure 1;

Figure 7 shows a horizontal cross-section along line 7-7 in Figure 7. 1, and

F i g. 8 shows, on an enlarged scale, a vertical section and shows a subcutaneous ampoule in front of Use.

As shown in the drawings, the injection device according to the invention consists of an outer, tubular sleeve or housing 1, which is preferably supported at its upper end by a cap 2 is completed and has a ring-like bottom face plate 3 with an opening 4. The ram guide tube 5 is attached to the lower end of the sleeve 1 and extends up to a point just below the release pin hole 6, which, as shown in FIG. 2, through the wall of the sleeve 1 runs. In the tube 5 is the spring-loaded ampoule injection plunger 7, the one the ampoule attacking bottom end portion 8 with reduced diameter, which, as in described below, through the opening 4 in the bottom face plate 3 can pass.

As in Fig. 1, runs from the left Side of the plunger 1 has a bore 9 transversely inwards, in which a piston 10 is seated with a sliding fit. This piston carries at its right end a locking pin of reduced diameter that goes into and through the Extension 9 'of the bore 9 can run through with a reduced diameter. Behind the Piston part 10 in the bore 9, a compression spring 12 is arranged and is by a pin 13 in its Location held. This spring 12 presses the piston part 10 and the locking pin 11 constantly to the right in Fig. 1 to 3. The movement of the locking pin 11 according to on the right, however, as in FIG. 2 shown by the plant of the right end face of the piston part 10 on the right end of the bore 9 is limited. In this position, the locking pin can something in the release pin hole 6 protrude into, but not beyond the outer wall of the sleeve 1. In this bolt position the locking pin 11 rests on the upper side of the tube 5 and in this way locks the injection plunger 7 in the cocked position against a downward movement.

A cylindrical punch or handle holder formed with it in one piece protrudes from the plunger 1

14 up. This stem part 14 lies in a sliding fit in the upwardly extending tubular section

15 of the slide part 16 tensioning the spring run through the wall of the tubular section 15 elongated slots 17 and 18 on opposite sides, and the ends of a guide pin 19, which extends through the upper end of the stamp 14 and is fastened in it, protrude into the Slots 17 and 18 into it and are guided in them, so that it has a dead passage having a connection forms between the plunger 7 and the carriage 16.

The spring-tensioning carriage 16 has the shape of a cylindrical piston with a sliding fit seated in the upper guide sleeve 20. This sleeve is fixed in the outer sleeve or housing 1, and on The upper end of the carriage 16 is a through slot 21 for receiving a first toggle lever 22 is formed which is articulated with one end in the slot 21 on a pivot pin 23. A second toggle lever 24 is seated pivotably on a pin 25 which, as shown in FIG. 5, runs transversely through the housing 1 and is supported in this and the sleeve 20. The toggle lever 24 has in Spaced side walls 24 'and 24 ", between the, as shown in FIG. 5, the lower toggle lever 22 protrudes. The ends of the two toggle levers 22 and 24 lying against one another are around a common one The pivot point is mounted on a pin 26 such that it can pivot with respect to one another.

The toggle lever 24 has an upper portion with one with the same radius around the central axis of the pin 25 extending curved outer surface 27, and a portion of the right side of the toggle lever 24 extends through a slot 28 in the sleeve 20 and the outer sleeve 1 to the outside. As in Fig. 1 to 3 clearly visible, the upper end of the slot 28 is close to the outer curved surface 27 of the toggle lever 24. Since the width of the slot 28 just corresponds to the width of the toggle lever 24, is the entry of dust or other foreign matter through the slot 28 into the interior of the mechanism essentially prevented.

From the part of the lever 24 located outside the housing 1, protruding downward, is with the toggle lever 24, preferably in one piece, an actuating handle which, as shown in FIG. 4 to 7 can clearly be seen has a trough-shaped cross-section to achieve the desired mechanical strength and Ensure rigidity. The lower portion 29 'of the handle 29 is bent slightly outwards to to facilitate the operation of the device. As in Fig. 1 to 3, there is a release pin on the handle 29 30 so arranged that it can be inserted into the release pin bore 6 in the outer shell 1 can when the handle 29 is in the release position according to FIG. 1 is moved.

A compression spring 31 is between the upper end of the plunger 7 and the lower end of the spring tensioning slide 16 arranged so that it presses these parts apart. This spring 31 is a coil spring, which, as will become clear from the following, is designed in such a way that it opposes the withdrawn and locked injection plunger 7 can be pressed and, when this plunger is triggered, the necessary force to push in the ampoule, to insert the hypodermic needle into the patient and to empty the drug through the needle.

The wall of the outer shell 1 extends downwards from the bottom face plate 3, but is cut out on one side, as shown in FIG. 1 at 33, in order to enable an ampoule A to be inserted in the release position. The base plate 34 holding the ampoule is also cut out on the same side as the casing 1 and is provided with a centering slot 35 according to FIG. 4, which facilitates the insertion of the ampoule A and enables the hypodermic needle 46 to penetrate.

In Fig. 8 there is shown in cross section an ampoule of the type usable in connection with the injection device according to the invention. This ampoule A consists of a flat bottom disk 40, which has a central projection 41 that extends from

this protrudes outwards. The remaining part of the ampoule consists of a bowl-shaped envelope 42 made of flexible plastic material with a flange portion 42 'which is sealed to the disc 40 during manufacture of the ampoule after the bowl-shaped portion has been filled with the medicament. On the upper end face 44 of the sheath 42, a metal disk 45 is attached to its inside, on which the hypodermic needle 46 is such that the liquid penetrate during use from the ampoule into the inner end of the needle and through the tip or the lower end of the Needle can be squeezed out. In order to facilitate the compression of the ampoule under the pressure effect of the plunger head 8, one or more grooves 47 can be provided in the side wall of the bowl-shaped casing 42. As shown in FIG. 3, when the device is cocked and ready for use, an ampoule A rests on the bottom plate 34 with its projection 41 protruding through the slot 35. If the plunger 7 is now released and the spring 31 moves it down into the position shown in FIG. 1 is moved, the ampoule is compressed and the tip of the hypodermic needle is pierced through the projection 41 at the bottom of the disc of the ampoule A into the patient, and while the cup-shaped sheath 42 is flattened, the liquid contained therein is passed through the needle 46 pressed.

The operation of the above-described mechanism will now be explained in detail.

In the device shown in Fig. 1, the parts are in the position that they occupy immediately after use and emptying of an ampoule. As can be seen, the ampoule A is flattened or pressed in, the hypodermic needle 46 protruding from the base plate 34. The tapered end 8 of the plunger 7 protrudes through the opening 4 of the bottom face plate 3, and the upper end of the plunger rests on the top of the plate 3 so that the movement of the end 8 engaging the ampoule is frictionally limited. The locking pin 11 is held in the release position or the position releasing the plunger in that its end is on the inner wall of the sleeve 5, as in FIG. 7, is applied, and the actuating spring 31 has expanded and thereby applied the force required to move the plunger 7 in the sense of compressing the ampoule A. The spring tension slide 16 is in its lowest or tensioned position, and the common pivot pin 26 of the knee joint formed by the levers 22 and 24 lies on the left side of the vertical center line between the end pivot pins 23 and 25. In this way, the still under a certain tension causes Spring 31 so that the knee joint arms remain in this position and the outer operating handle 29 in the position shown in FIG. 1 shown system or release position is held.

To prepare the device for another injection, the operator detects the Handle 29 and swings it outward by hand into the position shown in FIG. 2 return position shown, wherein the knee joint formed by the levers 22 and 24 is broken open and the spring tensioning slide 16 in the sleeve 20 is moved in the return direction. After some initial upward movement of the slide 16, the plunger 7 remains in its advanced position shown in FIG. 1 long until the free play between the plunger 7 and the carriage 16 is canceled and the lower Ends of slots 17 and 18 in tubular section 15 at the ends of pin 19 in part 14 attack. Moving the carriage 16 upwards then also lifts the part 14 together with the Plunger 7. When the handle 29 is in its full return position at the end of its upward movement achieved by abutment of the side of the toggle lever 22 on the bottom side of the slot 24 on the side wall of the housing, as shown in Fig. 2, is limited, the locking pin 11 in the plunger 7 is just above the upper end of the guide tube 5 is moved out, and the spring 12 then pushes the pin 11 outward into its advanced locking position according to FIG. 2. During this outward oscillation of the Handle 29 is the distance between the upper end of the plunger 7 and the underside of the spring tensioning slide 16 enlarged so that the compression spring 31 can expand accordingly.

After the handle 29 outwards into the position shown in FIG. 2 position shown is swung out and while the plunger 7 is raised into its clamping position and the locking pin 11 is moved into the locking position is, the handle 29 is inwardly on the shell 1 of the device in the one shown in FIG Position moved. During this movement, the knee joint 22, 24 is tensioned and the spring tensioning slide 16 moved down. Since the plunger 7 by acting on the upper end of the sleeve 5 Pin 11 is locked against moving downwards, the spring 31 is compressed. At the end of this spring tensioning stroke of the handle 29, the common pivot point 26 of the knee joint arrives 22, 24 in its dead center position, d. i.e., it moves to the left of a common Center line between the pins 23 and 25. This occurs when the free end of the trigger pin 30 reaches approximately the outer surface of the tubular casing 1. When the handle 29 is released in this position is, he remains in this position because the spring 31 him inwardly in contact with the pretensioned the outer end of the locking pin 11, however, since the spring 31 via the elongated toggle levers 22 and 24 in the sense of a clockwise rotation of the handle in Fig. 3 exerted force is not great enough to reduce the friction between the locking pin 11 and the sleeve 5 and the force of the spring 12 holding the pin in the locking position.

After the above-described tensioning of the device in the position according to FIG. 3 the device is ready for another injection. This is achieved by placing a fresh ampoule A on the base plate 34, the projection 41 lying in the slot. Magnet assemblies can be provided in the flange of the ampoule to hold it in place on the plate. The plate 34 is then brought into the position required for the desired injection and the handle 29 is pressed inwardly onto the sheath 1. If the handle from the position shown in FIG. 3 in the position according to FIG. 1 is moved, the locking pin 11 is pushed back against the spring until it comes free from the upper end of the tubular casing 5. When this occurs, the compressed spring 31 moves the plunger 5 and its tapered end portion 8 downward against it

the adjacent end face of the ampoule A and causes it to be compressed and the hypodermic needle 46 to be pushed through the projection 41 on the end face of the ampoule into the patient's tissue. As explained above, when the ampoule is squeezed and flattened, the liquid contained therein is squeezed out by the needle 46. With this arrangement, by accurately determining the dimension of the parts, the characteristics of the spring 31, etc. by means of the device, predetermined amounts of a medicament can be repeatedly injected subcutaneously in a uniform and desirable manner. The handling during loading and tensioning can be carried out quickly and easily by simply swinging the handle 29 out of the position shown in FIG. 2 and back into the position shown in FIG. 3 position shown. After the device, as shown in FIG. 3 shown, is tensioned, it is only triggered when the handle is pressed against the housing. The force required for this process is chosen so that incorrect injections are avoided. In addition, if desired, in the tensioned position according to FIG. 1, a removable safety stop or pin can be inserted between the handle 29 and the sheath 1 and only removed shortly before use.

Although the illustrated embodiment according to the invention is described in detail is, it goes without saying that there are changes and modifications in the training and arrangement of the individual parts possible. The invention is not intended to be based on those described and illustrated above Mechanism be limited.

Claims (8)

Patent claims: 1. Injection device, characterized by a housing construction, one in ampoule injection and return direction in the housing structure movably arranged ampoule injection plunger, a spring tensioning slide located at a distance from the injection plunger movable in the housing construction, an arrangement for connecting the injection plunger and the spring tensioning slide with dead passage, one lying between the injection plunger and the spring tensioning slide, acting against the injection plunger and pushing both apart Compression spring, one with one end on the spring slide and the other end on the Housing construction lying toggle lever arrangement, one acting on the toggle lever arrangement Operating handle that, when moved in one direction, the spring slide moves in the return direction and, if it is moved in the opposite direction, the Moves the spring slide in the tensioning direction, a locking device for releasable locking of the injection plunger against a movement caused by the spring and one by the Handle operated device for releasing the locking device. 2. Injection device according to claim 1, characterized in that the handle between a Locking and a release position is movable such that it moves the spring slide in Moves return position, if he himself is moved into the return position, that he moves the carriage moves in the spring tensioning direction when it moves itself in the opposite direction in the tensioned position is moved, and that it releases the locked injection plunger from its clamping position, when it is moved from the clamping position to the release position. 3. Injection device according to claim 2, wherein the toggle lever arrangement has two on a common Has pivot point lying toggle lever, characterized in that the handle the common pivot point from one side of the straight connecting line between the end pivot points the toggle lever moves when it is brought into the return position, and that it moves the common pivot point to the other side brings this straight line when it is brought into the clamping position. 4. Injection device according to one of claims 1 to 3, characterized by an arrangement for Receives an ampoule in alignment with the injection plunger. 5. Injection device according to one of claims 1 to 4, characterized by an arrangement for Limitation of the movement of the injection plunger to the adjacent face of the housing construction to. 6. Injection device according to one of claims 1 to 5, characterized in that the connection with dead gait during the end section of the movement in the return direction of the clamping slide takes the plunger with it in the return direction. 7. Injection device according to one of claims 4 to 6, characterized by a trigger pin on the handle that engages the locking device on the injection plunger when the common The pivot point of the toggle lever arrangement reaches its locking position beyond the connecting line, the first Knee lever during the movement of the handle on the housing construction to the The spring tensioning slide moves towards the locked injection slide and the actuating spring compresses and wherein the actuating spring acts on the toggle lever so that the handle in Clamped position is held. 8. Injection device according to claim 7, characterized in that the plunger by movement the handle with the release pin towards the housing structure via its clamping position can also be triggered in the trigger position, wherein the trigger pin is the plunger locking device triggers and thereby the plunger by the actuating spring in the sense of compression the ampoule is advanced. 1 sheet of drawings 309 779/11 1.64 © Bundesdruckerei Berlin