DE19652272A1 - Cartridge for ejector equipment - Google Patents

Abstract

The invention relates to a cartouche (1) for a hand operable ejector device (E) which dislocates a tappet (8), with back piston-locked filling with a medical substance (S) and a front mouth piece (19) with an opening (20), and a back holding section (21) for accommodating the cartouche (1) in the ejector device (E). In order to improve the cartouche and cartouche allocation, the invention proposes that the holding section (21) is provided with a screw thread formation for fastening the cartouche (1) in the ejector device (E) in the presence of axial dislocation such that the piston (34) comes into the range of action of the tappet (8).

Description

The invention relates to a cartridge for a hand-operated, ejector relocating a plunger direction, with piston-locked filling a medicinal substance and an anterior one Mouthpiece with mouth opening and a reverse heat term mounting section for receiving the cartridge in the ejector device.

A hand-operated ejector is through the U.S. Patent 2,472,116 known. It is shaped like a pistol detects and receives an injection syringe on the running side. It can be used over a cross shaft. The pestle this device grips like a claw across widened pressure piece of the piston skirt this ejector device.

An ejector device also essentially pistol-shaped training results from the EP 0 063 891 B2. The substance is in one piston-locked cartridge on the back, the others ends at an angle to the longitudinal axis of the cartridge has an angled mouthpiece. Its mouth opening can be closed with a hat. The mouthpiece laterally overhangs the cross section of the receptacle cut the cartridge. The piston hangs in the back partially out.

The object of the invention is cartridge and cartridges improve allocation.

This task is first and foremost a cartridge for a manually operated, a plunger relocating ejector with the features of  Claim 1 solved, with the focus being that the bracket section with a thread formation is provided for fastening the cartridge in the ejek Gate device with axial displacement such that the piston reaches the area of action of the tappet. This has two major advantages: The The piston is on the one hand in a recessed Storage; its location can be determined by random mechani loads are not changed. On the other hand the thread formation creates a reliable Andoc the cartridge. It is also axially perfect freely aligned so that the plunger hits safely. The cartridge is under the screw actuation fed to the plunger with regard to their piston. In this respect, the free cavity of the Bracket section even some guidance by the piston with respect to a rear end of the holder is shifted mouthpiece side. Continue it is suggested that the piston is in the cartridge is positively mounted. The defined position of the piston creates completely identical starting conditions conditions for such cartridges. There is no one premature dispensing of the substance, for example already at the Screw assignment of the cartridge and also not to one ineffective partial stroke of the ram. One is realized such positive locking simply by the fact that Piston has a peripheral bead in cooperation with an annular groove in the cartridge. Such means can be optimally realized using injection molding technology. At a cartridge for a manually operated, a plunger relocating ejector device, with piston at the rear sealed filling of a medicinal substance and a front mouthpiece with a mouth opening and a rear bracket section for receiving me of the cartridge in the ejector device, the  Cartridge a cylindrical receiving section points and the mouthpiece is angled to this then it proves to be an advantage liable that the mouthpiece essentially in an axia len projection of the cylindrical receiving portion lies. A correspondingly slim cartridge can be better guided to the destination; it doesn't come so easy to get caught in by that in general Mouthpiece realized in the form of an outlet tip.

It is also on a cartridge for a hand-operated right, a tappet relocating ejector device, with piston-filled filling of a medicin substance and an anterior, mouth opening having a mouthpiece and a rear hold tion section for the cartridge in the ejec gate device, with a further covering the mouthpiece kende envelope is provided, advantageously that the envelope on the outside in addition to the mouthpiece also the cylin drical receiving section covered. That leads practically full protection and avoids contamination preparing the treatment. The shell can be easy after screwing the cartridge pull it off. This also proves to be the case Superiority of this technical conception regarding of the diameter or cross section of the receptacle cut mouthpiece. The shell can even take on a further function by turning locking with the cylindrical receiving portion of the Cartridge interacts. The corresponding is implemented appropriate turnstile in an advantageous manner so that on the cylindrical receiving section axially ver on the outside running ribs are formed, which correspond with the grooves of the shell interact. So far that is Cover a screwdriver at the same time. The pin assignment  the envelope can be defined by simply the zylin drische receiving section has a stop collar and the corresponding insertion depth with regard to the casing is taken into account. It is also advantageous that the thread formation goes up to the stop collar. Here it is favorable if, on the other hand, the ribs in the on bunch of roots. The latter even have a stiffening effect on the cartridge body, which is useful if this made of relatively soft plastic material is. There is also an advantageous feature of the inven dung in that the shell inside, assigned to Mouth opening of the mouthpiece, one approximately parallel to the Opening plane of the mouth opening che has. The latter can also function as a seal take over, especially if the stop surface is rotationally symmetrical. Around the envelope despite possibly unfavorable tolerance pairings securely in position between it and the cartridge hold, there are clamping beads on the inside wall of the sleeve educated.

On a cartridge for a hand-operated, one Ram displacing ejector device, with rear piston-locked filling of a medical sub punch and a front, with a mouth opening Mouthpiece and a rear bracket section for receiving the cartridge in the ejector device, it also proves advantageous that the Cartridge screw-retained in the ejector device is. To do this, a thread area is used the ejector in a rotatable manner on the ejector device mounted rotating part is formed. over this rotating part can be easily inserted into the cartridge pull the device in. The corresponding counter offers the mentioned, anti-rotation sleeve  le. The rotating part is designed like a sleeve. For Increasing its grip can make it roughened on the outside be. It is also proposed that the turned part approximately is arranged coaxially to the plunger. Finally there is still an advantageous feature of the invention in that the rotating part via a projection bead in an annular groove on the outer surface of a tappet guide is held axially. Finally, another one is beneficial Design achieved by a clip holder Turned part on the ram guide.

The object of the invention is shown below a graphically illustrated exemplary embodiment les explained in more detail. It shows

Fig. 1 is an ejector device in a perspective view with, in exploded view as dergegebener plus cartridge shell

Fig. 2 is a longitudinal section through the sheath reinforced cartridge, greatly enlarged,

Fig. 3 is an interior view of the shell,

Fig. 4 is a plan view of the cartridge,

Fig. 5, the ejector device in side view with removed housing half for free access to the interior, partially sectioned in the region of the cartridge bearing, in specific assigned Kartu and processing in the basic position befindlicher Einrich

Fig. 6 a of FIG. 5 corresponding representation, however, at in-actuating position ejector

Fig. 7 shows the section according to line VII-VII in Fig. 5,

Fig. 8 shows the bare cartridge in side view

Fig. 9, the associated shell, partially broken, showing clamping beads (the last two figures are again shown in considerable enlargement).

The ejector device E shown is manually operated bar and the size of a common hand tool forms.

The ejector device E serves to dispense medical substances, held ready in a cartridge 1 . These are exchangeable cartridges. Their volume is such that there is, for example, a pasty amount of substance S which is sufficient for treatment in the dental field.

The application takes place via a plunger movement in the direction of the arrow x (see FIG. 6).

The ejector device E is designed in the form of pliers. The latter structurally comprises a housing-fixed Zan gene leg 2 and a pullable, movable tong leg 3rd The latter pivots around a commercial pin 4 and is spring-loaded in the direction of its basic position. The industrial spigot 4 crosses a housing 5 of the quite flat ejector device E. Housing 5 and fixed leg 2 are in one piece.

Starting from the housing 5 , this is another angle 6 assigned. The starts in the opposite direction to the most pliers limb 2 and forms a channel, designated as tappet guide 7 , for a tappet 8 . The fixed pliers leg 2 falls slightly from a longitudinal central axis yy of the elongated leg 6 .

The ejector device E contains a pinion 9 . A gearwheel 10 is part of the same. The latter is in engagement with a rack 11 . This continues coaxially in the plunger 8 . The Beiklappbewe movement of the movable pliers leg 3 is delivered to the gear 10 via an arc toothed segment 12 , which itself moves the ram 8 in the direction of the arrow x via the rack 11 .

When the actuating forces cease to exist, the movable pliers leg 3 returns to its basic position shown in FIG. 5. For this purpose, the plunger 8 is spring-loaded in the retraction direction. It is a screw thread pressure sensor of the 13th placed on the tappet shaft. The channel of the tappet guide 7 is designed to form a corresponding spring chamber 14 with a larger cross section. On the left-hand step jump achieved in this way, the end turn of the helical compression spring 13 is supported there. The other end turn of the said spring acts against a shoulder 15 of the rack 11th This is based on means not shown in the housing 5 . This can be an inner wall of the housing.

The axle pin of the gear 10 is designated 16 . It can, as can be seen from Fig. 7, the one half housing integrally formed. It projects with its free end into a pocket 17 of the other housing halves. Further details emerge from DE-GM 295 15 040.8 and are included here in their entirety, also for the purpose of including features of these documents in the claims of the present application.

Now to the cartridge 1 in detail: It has a long cylindrical receiving section 18 for the substance S, represented by a dot pattern patch. Seen in the drawing on the left side, the Kartu cal 1 a mouthpiece 19 is formed. His mouth opening 20 merges into a clear cross section, which is clearly below the clear diameter of the cylindrical Aufnah meababschnitt 18 (see. Fig. 2). Fug can be referred to as an outlet tip. The wall of the mouthpiece tapers towards the mouth opening.

The other end of the cartridge 1 has a bracket portion 21 . With thread formation, this carries an external thread 22 . This expediently extends essentially over the entire axial length of the holding section 21 . The threaded support section takes up about a third to a fifth of the total length of the cartridge. With regard to the external thread 22 , it is a right-hand thread. It can be multi-course.

The external thread 22 attaches to a stop collar 23 which divides the functional area of the holder. This is realized as the cylindrical outer wall of the cartridge 1, a ring collar which projects clearly outwards. The steep flank of the stop collar of the 23 on the right in the drawing limits the thread screwing stroke to the ejector direction E. So there is always an exactly reproducible basic position to the plunger 8 .

The left-hand steep flank of the stop collar 23 can cut the plug-in closure of a mouthpiece 19 and receptacle 18 of the cartridge 1 overlapping sleeve 24 . The latter is cap-shaped. It has a cylindrical shape. Your blanket has the reference number 25 .

Recognizable, the mouthpiece 19 is essentially in an axial projection of the jacket wall of the cylindri's receiving portion 18 of the cartridge 1 , so that the sleeve 24 , as already indicated, on the outside, in addition to the mouthpiece 19, also covers the cylindrical receiving portion 18 . This can happen over its entire length.

With regard to the assignment of the sheath 24 , a frictional connection to the jacket wall of the cartridge 1 can be used . As can be seen in FIG. 9, the corresponding effect is increased by the fact that 24 clamping beads 26 are formed on the inner wall side of the casing. The latter are axially spaced. There are two.

The closer to the ceiling 25 clamping bead 26 is axially spaced from it so that it practically comes into effect at the base of the mouthpiece 19 , which base still has the full circular basic cross section of the receiving portion 18 of the cartridge 1 . The spitting head of the cartridge 1 , ie the mouthpiece 19 , acts plug-centering.

The sleeve 24 is further provided on the inside with a stop surface 27 . This formed on the ceiling 25 stop surface is funnel-shaped Ge stalt, ie the stop surface 27 follows a Kegelman telfläche. The tip of such a cone coincides with the longitudinal central axis xx of the cartridge 1 and the plunger 8 .

These specifications allow the cover 24 to be used for sealing purposes by simply aligning the opening plane of the mouth opening 20 parallel to the stop surface 27 . The geometric axis of the mouthpiece channel is perpendicular to it and at an acute angle alpha of approx. 30 ° to the longitudinal center axis yy of the device.

The free end 28 of the sleeve 24 facing the stop collar 23 extends shortly before the left-hand steep flank of this ring collar, so that there is a contact between the stop surface 27 and the correspon- ding opening plane of the mouth opening 20 .

From the left-hand steep flank of the stop collar 23 , which extends transversely to the longitudinal center axis yy, ribs 29 extend in the longitudinal direction. The roots in the stop collar 23 and in the lateral wall of the section 18 of the receiving portion of the cartridge 1 . Its ( 29 ) axial length is less than that of the holding section 21 . On the mouth side, the ribs 29 tip out in a roof shape. The roof slopes that enclose an angle of approximately 90 ° are designated by 30 . The ridge line of the roof-shaped thinning lies in the radial. A total of four such ribs 29 are realized, distributed at the same angle on the circumference of the receiving section 18 .

The sleeve 24 interlocks with the cylindrical receiving section 18 of the cartridge 1 . The cover-side part of such a turnstile or take form axially aligned grooves 31 of the cover 24th The grooves are realized in a corresponding number of the ribs 29 and, viewed in the circumferential direction, have a multiple width of the ribs 29 . The grooves 31 leave longitudinal webs 32 between them. The width of a longitudinal web 32 measured in the circumferential direction corresponds to the width of a rib 29 measured in the same direction.

The grooves 31 are produced by reducing the wall thickness on the inner wall of the casing 24 . In the direction of the front end 28 of the sheath 24 , the rib-shaped longitudinal webs 32 also tip out in a roof shape. The roof slopes are designated 33 . The sloping roof encloses an angle of 90 °. Here too, the ridge line lies in the radial direction of the envelope 24 . The ridge line can be flush with the surface of the front end 28 . However, a slight relocation is preferred. The side flanks of both the ribs 29 and that of the longitudinal webs 32 run steeply, so that there is a good grip turnstile.

When plugging the roof slopes 30 , 33 Abwei water when rib 29 and the longitudinal web 32 should meet.

The outer surface of the sleeve 24 can be roughened, to improve grip.

The substance S accommodated in the cartridge 1 is sealed off from the outside by a piston 34 . This piston 34, which is designed in the form of a plug, can be seen particularly clearly from FIG. 2. The piston sits in a defined position in the transition region between the receiving section 18 containing the filling and the relatively shorter mounting section 21 . In other words, the piston 34 is seated with respect to a rear end 35 of the threaded support section 21 clearly on the mouthpiece side. The piston 34 is thus released from the influence of accidental touches. He does not protrude from this end. The depth offset to the end 35 is given by z. Z corresponds approximately to the piston diameter. In this respect, a practically leading insertion section for the plunger 8 also remains. By screwing the mounting section 21 into a corresponding internal thread 36 having a cartridge bearing 37 of the ejector device E, an axial feed of the cartridge 1 takes place in such a way that the piston 34 held therein arrives at the end of the stop-limited screwing-in movement into the area of action of the plunger 8 , which then moves the piston 34 by actuating the plunger 8 in the direction of the application of the substance S in the direction of the mouthpiece 19 . This happens when a high spreading force is reached.

The defined position of the piston 34 set back by z is achieved by way of the form-fitting holder. For this purpose, the basically cylindrical piston 34 has a circumferential bead 38 approximately in the middle of its length. The is continuous and interacts with a matching annular groove 39 on the cylindrical inner wall of the cartridge 1 . The piston 34 is also held securely here because the stop collar 23 acts like a hoop. Circumferential bead 38 and stop collar 23 are practically on a common transverse plane.

Both ends of the piston 34 run from a conical central portion from a truncated cone. The taper is rotationally symmetrical and directed outwards. At least the cone section facing the mouthpiece 19 has a truncated cone surface 40 which corresponds to the slope of a shoulder 41 in the transition between the receiving section 18 and the mouthpiece 19 (see FIG. 2). The corresponding contour as the end position of the piston 34 is shown in dash-dotted lines there.

The cartridge bearing 37, which is open at the head end of the device, is realized on a rotating part 42 which is rotatably arranged on the leg 6 . As can be seen from FIG. 5, this rotating part sits on a correspondingly provided pin section 43 which receives the sleeve-like rotating part 42 in an axially secured manner. The Zapfenab section 43 also forms the tappet guide 7th At the end face of this tappet guide 7 on the cartridge side, a threaded bore with a smaller cross-section begins, the internal thread 36 is tractive.

The end of the rotating part 42 on the right-hand side in the drawing is designed such that it forms a clip holder towards the pin section 43 fixed to the housing. For this purpose, it has a protrusion bead 44 directed radially inwards, which snaps into a matching annular groove 45 of the pin section 43 . The rotating part 42 is held in this way. From the locking nose-side end of the rotating part 42 outgoing longitudinal slots 46 provide the resilient evasive movement of this clip holder.

Function and handling are briefly summarized as follows. A in the sleeve 24 , fresh Kartu cal 1 is guided axially against the cartridge bearing 37 and its screw-holding bracket section 21 aligned there. The assignment is given by exercising a rotational movement on the rotating part 32 . The cartridge 1 retracts. The corresponding counterhold is formed by the envelope 24 , which also acts as a contamination protection. It is locked against rotation via the ribs 29 on the longitudinal webs 32 . After completion of the basic position of the cartridge 1 towards the injection device E, which is precisely defined by the stop collar 23, the device is moved to the destination after the cover 24 has been removed. By pulling the pliers leg 3 , the plunger 8 moves in the direction of arrow x. The piston 34 is advanced in overcoming a certain inhibition in this Rich direction and the substance S through the mouthpiece 19 targeted and powerfully applied. Letting go of the movable leg 3 causes the helical compression spring 13 to bring about the basic position shown in FIG. 5.

The cartridge 1 can be filled via the mouth opening 20 . If necessary, their mouth opening 20 is still sealed. This can be an aluminum foil with a protruding tab that protrudes freely.

All the features disclosed are essential to the invention. The disclosure of the application is hereby also Disclosure content of the associated / attached priori full documents (copy of the pre-registration) Lich included, also for the purpose of characteristics of this Documents in claims of the present registration with to record.

Claims (20)

1. Cartridge ( 1 ) for a manually operable, a plunger ( 8 ) relocating ejector device (E), with a plunger-closed filling of a medical substance (S) and a front, a mouth opening ( 20 ) having a mouthpiece ( 19 ) and a rear mounting section ( 21 ) for receiving the cartridge ( 1 ) in the ejector device (E), characterized in that the mounting section ( 21 ) is provided with a thread for fastening the cartridge ( 1 ) in the ejector device (E) with axial displacement in such a way that that the piston ( 34 ) comes into the effective range of the plunger ( 8 ). 2. Cartridge according to claim 1 or in particular according thereto, characterized in that the piston ( 34 ) is displaced with respect to a rear end ( 35 ) of the mounting section ( 21 ) on the mouthpiece side. 3. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the piston ( 34 ) in the cartridge ( 1 ) is positively retained. 4. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the piston ( 34 ) has a peripheral bead ( 38 ) in cooperation with an annular groove ( 39 ) in the cartridge ( 1 ). 5. Cartridge ( 1 ) for a manually operable, a plunger ( 8 ) relocating ejector device (E), with a plunger-closed filling of a medical substance (S) and a front, a mouth opening ( 20 ) having a mouthpiece ( 19 ) and a rear mounting section ( 21 ) for receiving the cartridge ( 1 ) in the ejector device (E), the cartridge ( 1 ) having a cylindrical receiving section ( 18 ) and the mouthpiece ( 19 ) being angled to this end, characterized in that the mouthpiece ( 19 ) lies essentially in an axial projection of the cylindrical receiving section ( 18 ). 6. Cartridge ( 1 ) for a manually operable, a plunger ( 8 ) relocating ejector device (E), with a plunger-closed filling of a medical substance (S) and a front, a mouth opening ( 20 ) having a mouthpiece ( 19 ) and a rear mounting section ( 21 ) for receiving the cartridge ( 1 ) in the ejector device (E), a cover ( 24 ) covering the mouthpiece ( 19 ) being provided, characterized in that the cover ( 24 ) on the outside in addition to the mouthpiece ( 19 ) also covers the cylindrical receiving section ( 18 ). 7. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the sleeve ( 24 ) interlocking with the cylindrical receiving portion ( 18 ) cooperates. 8. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that on the cylindrical receiving portion ( 18 ) axially extending ribs ( 29 ) on the outside are ausgebil det, which with corresponding grooves ( 31 ) of the shell ( 24 ) work together. 9. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the cylindrical receiving section ( 18 ) has a stop collar ( 23 ). 10. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the thread formation up to the stop collar ( 23 ). 11. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the ribs ( 29 ) are rooted in the stop collar ( 23 ). 12. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the sleeve ( 24 ) inside, assigned to the mouth opening ( 20 ) of the mouthpiece ( 19 ), is approximately parallel to the opening plane of the mouth opening ( 20 ) fende stop surface ( 27 ). 13. A cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the stop surface ( 27 ) is formed rotationally symmetrical. 14. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the inner wall side of the sheath ( 24 ) is formed Stewwül ( 26 ). 15. Cartridge ( 1 ) for a manually operable, a plunger ( 8 ) shifting ejector device (E), with a piston-sealed filling of a medicinal substance (S) at the rear and a front mouth opening ( 20 ) having a mouthpiece ( 19 ) and a backward gene Holding section ( 21 ) for receiving the cartridge ( 1 ) in the ejector device (E), characterized in that the cartridge ( 1 ) in the ejector device (E) is screw-mounted. 16. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that a threaded area of the ejector device (E) is formed in a rotatable part ( 42 ) mounted on the ejector device (E). 17. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the rotating part ( 42 ) is sleeve-like. 18. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the rotating part ( 42 ) is arranged approximately coaxially to the plunger ( 8 ). 19. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized in that the rotating part ( 42 ) over a projection bead ( 44 ) in an annular groove ( 45 ) on the lateral surface of a plunger guide ( 7 ) is held axially. 20. Cartridge according to one or more of the preceding claims or in particular according thereto, characterized by a clip holder of the rotating part ( 42 ) on the plunger guide ( 7 ).