CA2203778A1 - Apparatus for injecting a rigid carrier - Google Patents
Apparatus for injecting a rigid carrierInfo
- Publication number
- CA2203778A1 CA2203778A1 CA 2203778 CA2203778A CA2203778A1 CA 2203778 A1 CA2203778 A1 CA 2203778A1 CA 2203778 CA2203778 CA 2203778 CA 2203778 A CA2203778 A CA 2203778A CA 2203778 A1 CA2203778 A1 CA 2203778A1
- Authority
- CA
- Canada
- Prior art keywords
- carrier
- skin
- injecting
- barrel
- spacer element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Abstract
The invention relates to an apparatus for injecting the body of humans or animals with a pharmaceutical preparation, wherein the preparation is arranged in a rigid carrier, wherein the apparatus comprises: a chamber into which the carrier can be transported; and a channel connecting onto the chamber for transporting the carrier into the body, comprising: fixation means for fixing the end of the channel relative to the skin of the body for injecting in order to prevent a movement of the channel in the direction perpendicularly of the axis of the barrel. According to one embodiment the fixation means are formed by chamfered protrusions formed on the part adapted for contact with the skin of the body and extending substantially in the direction of the axis of the channel.
Description
CA 02203778 1997-04-2~
W O 96/13300 PCT~YL95/0037S
APP~J~ JS FOR IN~ N~ A RIGID ~T~
.
The invention relates to an apparatuæ for injecting the body of hllm~n~ or ~nim~l S with a pharmaceutical preparation, wherein the preparation is arranged in a rig.id carrier, wherein the apparatus comprises:
- means for transporting the carrier into the chamber; and - a ch~nnel connecting onto the chamber for trans-por~ing the carrier into the body.
Such an apparatus is known inter alia from 10 WO-93/23110. Such an apparatus is furthermore known in another form from WO-91/12048.
In both cases of these known apparatus there is the danger of the injecting apparatus moving relative to the body during entry, at least at the place of entry of the 15 carrier into the body, which can cause destruction of the carrier, excessive pain to the body for injecting and the danger of injection taking place at an incorrect location in the body.
The object of the present invention is to avoid the 20 above stated problems.
This object is achieved in that the apparatus is provided with fixation means ~or fixing the end of the ch~nn~l relative to the skin of the body for injecting.
As a result of these steps an adequate fixation 25 takes place so that the above mentioned dangers are obvlated.
According to a first embodiment the fixation means are adapted for clamping engagement on the skin.
According to a second embodiment the fixation means 30 are formed by chamfered protrusions formed on the part adapted for contact with the skin of the body and ex-tending substantially in the direction of the axis of the ~h~nnPl .
A preferred embodiment relates to an apparatus for CA 02203778 1997-04-2~ --injecting the body of hnm~n~ or ~n;m~ls with a pharma-ceutical preparation, wherein the preparation is arranged in a rigid carrier, wherein the apparatus comprises: _ a chamber in which the carrier can be placed; _ means for transporting the carrier into the chamber;
a barrel connecting onto the chamber; and discharging means for supplying pressurized gas to the chamber for expelling the carrier through the barrel.
A spacer element is arranged which extends round the 10 mouth of the barrel and which is adapted to direct the air flow preceding the carrier during discharging such that the air flow is guided at least partially along at least that part of the skin of the body for injecting where the carrier then enters the skin.
The danger is hereby avoided of cont~m;n~nts possibly present on the skin being carried along with the carrier into the body and there causing infections or otherwise having an adverse effect. Also avoided is the danger, particularly when the carrier must be placed 20 through a hirsute skin, of hairs also being carried in by the carrier and likewise having adverse effects. I
According to another preferred embodiment the spacer element is adapted to hold the mouth of the barrel at a distance from the ~n;m~l for injecting at least during 25 discharging.
As a result of these steps the air flow preceding the carrier can escape between the barrel and the skin, whereby the required direction of the gas flow is ob- ¦
tained. -~
According to another preferred embodiment the spacer element is provided with recesses. Due to these recesses the gas flow escaping between the barrel and the skin can ~ _ also pass through the spacer element without too many obstructions. ~ -According to yet another preferred embodiment the spacer element is provided on its part adapted for con-tact with the ~n;m~l with engaging means for preventing a movement o~ the spacer element in the direction perpen-.
CA 02203778 1997-04-2~
W O96113300 PCT~NL95~00375 dicularly of the axis of the barrel. This prevents so-cal]ed lateral slippage of the barrel whereby the position at which the carrier enters the body might be less reliably determ;ne~.
Other attractive preferred embodiments will be found in the r~mA ~ n i ng sub-claims.
The present invention will be elucidated hereinbelow with reference to the annexed drawings, in which:
figure 1 shows a perspective view of an apparatus 10 according to the invention;
figure 2 shows a perspective view of a holder for carriers for use with the apparatus according to the invention;
figure 3 shows a partly broken away perspective 15 detail view according to arrow III in figure l;
~ igure 4 shows a partly broken away perspective detail view according to arrow IV in figure l;
figure 5 shows a partly broken away perspective detail view of the part shown in figure 4 from the other 20 side.;
~ igure 6 is a partly broken away perspective detail view of a variant of the mouthpiece shown in figure 3;
figures 7-9 show sectional views of a second variant of the mouthpiece shown in figure 1 during dif~erent 25 points in time of the injecting;
igures 10-13 show sectional views o~ the apparatus according to the invention during the actual injecting operation; and ~ igure 14 is a perspective view o~ an alternative 30 embodiment of the invention.
Shown in figure 1 is an injecting apparatus which is ~ormed by a housing 2 to which is ~ixed a barrel 3, on the end of which a mouthpiece 4 is arranged. Further fixed to the housing is a bracket 5 and a pressurized gas 35 reservoir 6 and a hand-grip 7, wherein the apparatus further comprises a trigger 8. The mouthpiece 4 and housing 2 are further connected by a connecting tube 9.
The apparatus is suitable for discharging carriers CA 02203778 1997-04-2~
W O96/13300 PCTn~LgS/00375 10 which are shown in figure 2, wherein carriers 10 are accommodated in a belt 11. This latter is arranged in a cassette 12. The cassette has an annular construction, wherein one part is thickened for receiving the folded 5 belt 11.
When cassette 12 is connected to the injecting apparatus 1, a removable part 13 is taken from the cassette, whereafter cassette 12 can be arranged with one end in an aperture 14 arranged for this purpose. The 10 other end then connects onto an aperture (not shown in figure 1) arranged on the upper part of the injecting apparatus.
The mouthpiece 4 is shown in more detail in figure 3. Mouthpiece 4 is fastened onto the barrel 3 by means of 15 a screw connection. It should be noted here that the actual barrel, i.e. the guide for the carriers 10, is situated inside the external barrel 3 depicted in figures 1 and 3.
When mouthpiece 4 is pressed against the body for 20 injecting the mouthpiece 4 can move in axial direction relative to the actual barrel, not shown in figure 3, wherein mouthpiece 4 can be moved rearward relative to the relevant barrel and the discharging mechanism is set into operation.
For discharge of the air pushed out in front of the carrier 10 the edge 15 of the mouthpiece is provided with air discharge openings 16. These of course also provide for discharge of the propellant gas following the carrier 10 .
Further arranged in mouthpiece 4 is an atomizing _ device 17 which is formed by a nozzle 18 which is con- -nected to a reservoir (not shown in the drawing) received in the connecting tube 9. For operation thereof use is again made of the relative movement of the mouthpiece~ _ 35 when it is pressed against a body for injecting, res- !
pectively is removed therefrom. For this purpose the nozzle 18 is provided wi~h a concentric ring 19 and a spring 20.
CA 02203778 1997-04-2~
W O96tl3300 PCT~L95~00375 It is thus possible to atomize the liquid present in the reservoir when mouthpiece 4 is pressed against the body for injecting, but equally to cause atomizing to take place when the mouthpiece 4 is moved away from the 5 body.
The nozzle 18 is formed such that for instance a star-shaped marking is applied to the skin. It is of course likewise possible for other figures to be formed, for instance circles, squares, triangles etc. It is also 10 possible to adapt the form of the marking by means of the edge 15 with the recess 16 or another body for placing between the skin and the nozzle.
The construction of the discharging and safety mechanism will now be elucidated with reference to figure 15 4. In housing 2 is arranged a frame 21 made of metal in which the relevant components are mounted.
The internal barrel 22 through which the carriers are fired is fixedly connected to frame 21. The external barrel 3 shown in the foregoing figures, which is axially 20 movable relative to the barrel 22, is connected to a bridge 23 which is connected to two rods 24,25 which extend through frame 21 and which are guided through the transverse walls forming part of frame 21. It is possible to make use of other connecting elements instead of a 25 concentric barrel. When the external barrel 3 is moved in axial direction the rods 24,25 move therewith. Two rollers 26,27 are mounted on the rods 24,25. Made in the rollers are grooves 28 which have a substantially semi-cylindrical cross section, wherein the rollers are placed 30 relative to each other such that they are almost mutually impinging and both semi-cylindrical grooves 28 together form a cylindrical opening which forms the chamber of the discharging device.
Figure 5 shows the same device, but from the other 35 side. The rods 24,25 are each connected to an L-shaped body 29 respectively 30 which are mutually joined by means of a shaft 31. Mounted on shaft 31 is a hook 32 which, when the rods are moved rearward in figure 4, is CA 02203778 1997-04-2~
W O96/13300 PCT~NL95/00375 also carried along rearward by means of the angle pieces 29,30 and the shaft 31.
The hook 32 engages on a shoulder of a torpedo-shaped body 32 which is mounted on a shaft 33 extending 5 parallel to the rods 24,25. By means of a helical spring 34 wound round shaft 33 the torpedo-shaped body 32 is urged forward. Arranged inside shaft 33 is a thrust shaft 35 which, when the ~orpedo-shaped body 32 moves forward in the direction of arrow 36, strikes thrust shaft 35.
Thrust shaft 35 is in turn adapted to lift the ball 37 of a ball valve 38. The latter is arranged between a pressurized air line 39 connected to reservoir 9 and a pressurized air line 40 which leads to the chamber 41 formed by two semi-cylindrical openings 28. When the 15 barrel 3 is thus moved rearward when the mouthpiece 4 makes contact with a body for injecting, the bridge 23, the rods 24,25, the L-shaped bodies 29,30, the shaft 31, the hook 32 and therewith the torpedo-shaped body 32 are thereby moved rearward as far as a stop which is formed 20 by the rear wall of frame 21.
Arranged on the top part of hook 22 is a ball 42 which, as it approaches the stop, rises against an in-clining wall 43, whereby the hook is raised and the torpedo-shaped body 32 shoots forward as a result of the 25 spring pressure generated by spring 34, strikes the thrust shaft 35 and the valve 37 is lifted counter to the spring force of the spring 42 arranged therein.
A determined quantity of pressurized air from the pressurized gas cylinder 9 is thus fed to the chamber 41, 30 whereby the carrier 10 is expelled through the internal barrel 22. As a result of the action of helical springs 45,46 arranged on rods 24,25, the rods and the barrel , spring are then urged back to their original position. It will thus be apparent that by pressing the mouthpiece . _ 35 against a body for injecting, a carrier present in chamber 41 is injected.
When the apparatus is moved away from the body for injecting, transport of the belt 11 takes place by means CA 02203778 1997-04-2~
W 0961~33~0 PCTA~L95100375 of a worm wheel and freewheel me~h~n; m (not shown) by operating the roller 27. It is of course also possible to have this take place during the movement in the reverse direction.
A number of the safety mechanisms forming part of the safety system will now be elucidated.
A first sa~ety mechanism is ~ormed by the trigger 8 which is connected to the lever 9. When trigger 8 is not actuated and the lever 9 is situated in the position 10 shown in ~igure 4, the rearward movement of rods 24,25 and the components connected thereto is blocked by a connecting block 47 which is connected to both rods and the rearward movement of which is prevented by the lever 46. Only when the trigger 8 is actuated can the bridge 47 15 move to the rear and a carrier 10 be discharged.
A further safety mechanism is formed by a pressure measuring element. As shown most clearly in figure 5, on the right-hand side of the wall 48 ~orming part of frame 41, i.e. in the space 49 arranged there, prevails the 20 pressure o~ the pressurized gas present in the pressurized gas cylinder 9. This pressure presses outward a pin 50 arranged in the relevant wall 48.
On the relevant side of wall 48 is mounted a shaft 51 on which a U-shaped lever 52 is fixed. The U-shaped 25 lever comprises an L-shaped lever 53 which is pressed against the wall 48 by means of springs 54 arranged on shaft 51. Only when the pressure inside chamber 49, that is the pressure of the pressurized gas inside pressurized gas cylinder 9, reaches a determ;ne~ value is the force 30 exerted by the pin 50 such that it moves the U-shaped lever 52 downward counter to the spring pressure of springs 54, whereby movement of the torpedo-shaped body 32 is released. When however this pressure is too low, the U-shaped lever 52 is situated in its uppermost po-35 sition whereby movement of the torpedo-shaped body 32 is prevented, as is discharging of a carrier.
Figure 6 further shows an alternative embodiment of the mouthpiece. This alternative mouthpiece 56 is con-CA 02203778 1997-04-2~
W O96/13300 PCTn~L95/00375 structed wholly concentrically round the barrel 22. The edge 57 of the mouthpiece is here also provided with six recesses S 8 which in the present case are distributed evenly along the round edge 57.
Between each of the recesses 58 are thus created tooth-like protrusions 71. The edge 57 of each of the v protrusions 71 is defined by an imaginary truncated cone, the axis of which coincides with the axis of the barrel 3. Due to the truncated cone form the contact surfaces 57 10 are each provided with a flat portion 72 and the in-clining portion 73 which is located further to the outside and the form of which is defined by the cone.
This ~orm has the advantage that only by pressing the apparatus according to the invention against the skin of 15 the body for injecting at a determined angle can sufficient force be built up to depress the mouthpiece 56 sufficiently far to enable discharging. This will in any case prevent the apparatus being fired when the angle at which it is pressed against the skin differs greatly from 20 an angle of 90; this would result in a carrier entering the body obliquely which, as already explained, is undesirable. At a larger angle the apparatus will slip on the skin due to the oblique surface portions 72.
In order to prevent slippage when the apparatus is 25 pressed against the body at a correct angle, tooth-like protrusions 74 are arranged on the flat portions 72. e The shown form of the teeth has the further ad- _ vantage that, as stated above in the preamble, it becomes possible to deflect the air flow coming from the barrel 30 and preceding the carrier, with the useful effect that the hairs are blown aside in a ring shape from the position where the carrier enters the body, and wherein cont~m;n~nts which may be present are also carried away.
Furthermore, the gas flow expelling the carrier is like-35 wise carried away without having the opportunity to enter the body, which of course is likewise less desirable.
In addition, two reservoirs 58,59 are arranged here which are each provided with a liquid and which are CA 02203778 1997-04-2~
W O96113~00 ' PCTA~L95100375 activated when the mouthpiece 56 is pressed against a body for injecting. It is for instance possible herein for the one reservoir 58 to contain a marking fluid, 0 wherein the marking fluid is atomized by the atomizer 60 5 connected thereto to indicate that the relevant body has been injected, while the other liquid reservoir 59 can for instance contain a disinfectant liquid which can be atomized either before or after injection to disinfect the wound formed by injecting the carrier.
It is noted herein that it is possible to disinfect or to mark prior to discharging of the carrier, that is before the actual injecting operation, or to disinfect or mark after injection. It is even possible to mark before injecting and then to disinfect or vice versa. It will be 15 apparent that diverse other possible constructions for mouthpieces are also possible.
This is elucidated with reference to figures 7-9 in which a second alternative embodiment of a mouthpiece is shown. This is formed by a mouthpiece 63 inside which is 20 received a reservoir 64 for liquid for atomizing which is connected to the internal barrel 22 by means of a bracket 65 and which can be operated by means of a thrust disc 66 and a helical spring 67.
Figure 7 shows the rest position, wherein figure 8 25 shows how by pressing the mouthpiece 63 against a body 68 discharging of a carrier 10 is initiated, wherein in figure 8 is shown that carrier 10 leaves the barrel 22.
With further pressing an atomizer 69 accommodated in bracket 65 is activated, which atomizes a relevant 30 quantity of the liquid held in reservoir 64.
The design of the mouthpiece is preferably chosen such that it is possible to inject at an angle of a m~;mllm of about 30 to the normal of the plane in which the housing of the body to be injected is located. If the 35 angle is larger the mouthpiece slips and it is no longer possible to depress the mouthpiece so far that a carrier can be fired.
This angle of course depends on the form of the CA 02203778 1997-04-2~
W O96113300 PCT~NL95/00375 carrier, in particular the tip of the carrier. When the tip is sharp, i.e. the tip has a cone shape with a small apex angle, injection can take place at a larger angle to the normal. This is also the case when the radius of the 5 rounding of the tip is small.
Figures 10-13 show schematically how carrier 10 enters the body for injecting. The mouthpiece and the barrel are only shown schematically here. The body for injecting 68 is provided with a skin 69 on which are 10 situated hairs 70.
As shown in figure 10, the carrier 10 leaves the mouth of the barrel 3 and then cuts through the skin 69, wherein the carrier 10 enters the underlying tissue 68.
The carrier 10 will continue its movement in the tissue 15 68 until this is damped by the density of the tissue 68 and the carrier comes to a stop.
Such a situation is shown in figure 12. It can also be seen in this figure that as a result of the dynamic phenomena in the underlying tissue a cavity 70 forms 20 behind carrier 10 which closes after damping of the movement phenomena, whereafter the situation shown in figure 13 is obtained. ~ere can be seen that only a very small wound results which heals easily. The carrier is subsequently broken down in the body, wherea~ter the 25 pharmaceutical substance present in the carrier can perform its curative function. This is further described in the international patent application with publication number W0-93/23110.
It is pointed out that, as can be seen in figure 10, 30 the air flow moving ahead of the carrier 10 blows aside the hairs 70 at the position where carrier 10 will enter the body, so that the hairs will not make entry of the ~ _ carrier difficult. Blowing aside of the hairs moreover prevents the hairs being carried by the carrier into the . _ 35 wound, which would complicate healing of the wound.
Cont~m;n~nts which may be present at the relevant po- _ sition are also carried away.
This provides the option of performing the disin--W O96/13300 PCT~NL9510037 fecting spray treatment only after entry of the carrier, which is the opposite of what is usual in the medical and veterinary arts.
In figure 14 is shown an alternative embodiment of 5 an apparatus according to the invention. This embodiment comprises two plates 71, 72 respectively which are mutually connected on their end by means of a hinge 73.
Plates 71,72 are somewhat rounded at their other end and are slightly widened in the vicinity of this free end.
10 Each of the plates 71,72 is provided on the inner side with a friction-increasing layer 73. Instead of a roughened surface it is now possible to make use of for instance ribs.
Arranged on plate 72 is a ch~nn~l 74 with a sub-15 stantially circular diameter. In the vicinity of the endof plate 72 and of ch~nnel 74, although still at a distance therefrom, an opening 75 is arranged in rh~nne 74, the length of which opening is at least as great as the length of the carriers for introducing with the 20 present apparatus.
Movable in the channel is a plunger 76 which is joined to a pressing element 77 which can be operated with the thumb. Around a part of the channel is arranged a shell 78 outside which the pressing element 77 extends.
A similar shell 79 is otherwise mounted on the other plate 71, which shell is provided with a thickening 80 to define the correct position of the fingers.
The operation of this apparatus is as follows: a fold of skin of an ~nim~l for injecting is grasped by 30 hand, as shown in figure 14, wherein on each of the sides of the fold of skin is placed a plate 71, respectively 72 c and the two plates are then pressed together counter to the spring pressure of spring elements 81 fixed at the hinge 73. A carrier to be injected can subsequently be 35 placed in the opening 75 which can then be pushed inside through the skin by pressing with the thumb against the pressing element 77 by means of the plunger 76, in a m~nnPr which is otherwise per se known with a so-called W O96/13300 PCT~YLS5/0037 trocar.
It is herein noted that by fold of skin is not only understood an actual fold of skin but also for instance a protruding soft body part, for instance an auricle. It is 5 also important here that it is possible by means of the invention to obtain fixation of the injectiny apparatus relative to the skin, which in the prior art is not possible. It will be apparent that with this "trocar"-like injecting apparatus it is also possible to use a 10 fixation device as used in the initially described em-bodiment; the reverse is however e~ually possible; with an injecting apparatus operating with pressurized gas it is likewise possible to employ a clamping device for fixation purposes.
It will be apparent that the construction of the apparatus according to the invention can be changed in diverse ways without departing from the inventive con-cept. It is thus possible in the initially described embodiment to fix the container for pressurized gas to 20 the apparatus in another manner and to assign it a dual function, for instance the additional function o~ hand-grip. There are of course also numerous possibilities for making a construction as described with reference to figures 4 and 5, particularly in respect of the safety 25 mechanisms.
W O 96/13300 PCT~YL95/0037S
APP~J~ JS FOR IN~ N~ A RIGID ~T~
.
The invention relates to an apparatuæ for injecting the body of hllm~n~ or ~nim~l S with a pharmaceutical preparation, wherein the preparation is arranged in a rig.id carrier, wherein the apparatus comprises:
- means for transporting the carrier into the chamber; and - a ch~nnel connecting onto the chamber for trans-por~ing the carrier into the body.
Such an apparatus is known inter alia from 10 WO-93/23110. Such an apparatus is furthermore known in another form from WO-91/12048.
In both cases of these known apparatus there is the danger of the injecting apparatus moving relative to the body during entry, at least at the place of entry of the 15 carrier into the body, which can cause destruction of the carrier, excessive pain to the body for injecting and the danger of injection taking place at an incorrect location in the body.
The object of the present invention is to avoid the 20 above stated problems.
This object is achieved in that the apparatus is provided with fixation means ~or fixing the end of the ch~nn~l relative to the skin of the body for injecting.
As a result of these steps an adequate fixation 25 takes place so that the above mentioned dangers are obvlated.
According to a first embodiment the fixation means are adapted for clamping engagement on the skin.
According to a second embodiment the fixation means 30 are formed by chamfered protrusions formed on the part adapted for contact with the skin of the body and ex-tending substantially in the direction of the axis of the ~h~nnPl .
A preferred embodiment relates to an apparatus for CA 02203778 1997-04-2~ --injecting the body of hnm~n~ or ~n;m~ls with a pharma-ceutical preparation, wherein the preparation is arranged in a rigid carrier, wherein the apparatus comprises: _ a chamber in which the carrier can be placed; _ means for transporting the carrier into the chamber;
a barrel connecting onto the chamber; and discharging means for supplying pressurized gas to the chamber for expelling the carrier through the barrel.
A spacer element is arranged which extends round the 10 mouth of the barrel and which is adapted to direct the air flow preceding the carrier during discharging such that the air flow is guided at least partially along at least that part of the skin of the body for injecting where the carrier then enters the skin.
The danger is hereby avoided of cont~m;n~nts possibly present on the skin being carried along with the carrier into the body and there causing infections or otherwise having an adverse effect. Also avoided is the danger, particularly when the carrier must be placed 20 through a hirsute skin, of hairs also being carried in by the carrier and likewise having adverse effects. I
According to another preferred embodiment the spacer element is adapted to hold the mouth of the barrel at a distance from the ~n;m~l for injecting at least during 25 discharging.
As a result of these steps the air flow preceding the carrier can escape between the barrel and the skin, whereby the required direction of the gas flow is ob- ¦
tained. -~
According to another preferred embodiment the spacer element is provided with recesses. Due to these recesses the gas flow escaping between the barrel and the skin can ~ _ also pass through the spacer element without too many obstructions. ~ -According to yet another preferred embodiment the spacer element is provided on its part adapted for con-tact with the ~n;m~l with engaging means for preventing a movement o~ the spacer element in the direction perpen-.
CA 02203778 1997-04-2~
W O96113300 PCT~NL95~00375 dicularly of the axis of the barrel. This prevents so-cal]ed lateral slippage of the barrel whereby the position at which the carrier enters the body might be less reliably determ;ne~.
Other attractive preferred embodiments will be found in the r~mA ~ n i ng sub-claims.
The present invention will be elucidated hereinbelow with reference to the annexed drawings, in which:
figure 1 shows a perspective view of an apparatus 10 according to the invention;
figure 2 shows a perspective view of a holder for carriers for use with the apparatus according to the invention;
figure 3 shows a partly broken away perspective 15 detail view according to arrow III in figure l;
~ igure 4 shows a partly broken away perspective detail view according to arrow IV in figure l;
figure 5 shows a partly broken away perspective detail view of the part shown in figure 4 from the other 20 side.;
~ igure 6 is a partly broken away perspective detail view of a variant of the mouthpiece shown in figure 3;
figures 7-9 show sectional views of a second variant of the mouthpiece shown in figure 1 during dif~erent 25 points in time of the injecting;
igures 10-13 show sectional views o~ the apparatus according to the invention during the actual injecting operation; and ~ igure 14 is a perspective view o~ an alternative 30 embodiment of the invention.
Shown in figure 1 is an injecting apparatus which is ~ormed by a housing 2 to which is ~ixed a barrel 3, on the end of which a mouthpiece 4 is arranged. Further fixed to the housing is a bracket 5 and a pressurized gas 35 reservoir 6 and a hand-grip 7, wherein the apparatus further comprises a trigger 8. The mouthpiece 4 and housing 2 are further connected by a connecting tube 9.
The apparatus is suitable for discharging carriers CA 02203778 1997-04-2~
W O96/13300 PCTn~LgS/00375 10 which are shown in figure 2, wherein carriers 10 are accommodated in a belt 11. This latter is arranged in a cassette 12. The cassette has an annular construction, wherein one part is thickened for receiving the folded 5 belt 11.
When cassette 12 is connected to the injecting apparatus 1, a removable part 13 is taken from the cassette, whereafter cassette 12 can be arranged with one end in an aperture 14 arranged for this purpose. The 10 other end then connects onto an aperture (not shown in figure 1) arranged on the upper part of the injecting apparatus.
The mouthpiece 4 is shown in more detail in figure 3. Mouthpiece 4 is fastened onto the barrel 3 by means of 15 a screw connection. It should be noted here that the actual barrel, i.e. the guide for the carriers 10, is situated inside the external barrel 3 depicted in figures 1 and 3.
When mouthpiece 4 is pressed against the body for 20 injecting the mouthpiece 4 can move in axial direction relative to the actual barrel, not shown in figure 3, wherein mouthpiece 4 can be moved rearward relative to the relevant barrel and the discharging mechanism is set into operation.
For discharge of the air pushed out in front of the carrier 10 the edge 15 of the mouthpiece is provided with air discharge openings 16. These of course also provide for discharge of the propellant gas following the carrier 10 .
Further arranged in mouthpiece 4 is an atomizing _ device 17 which is formed by a nozzle 18 which is con- -nected to a reservoir (not shown in the drawing) received in the connecting tube 9. For operation thereof use is again made of the relative movement of the mouthpiece~ _ 35 when it is pressed against a body for injecting, res- !
pectively is removed therefrom. For this purpose the nozzle 18 is provided wi~h a concentric ring 19 and a spring 20.
CA 02203778 1997-04-2~
W O96tl3300 PCT~L95~00375 It is thus possible to atomize the liquid present in the reservoir when mouthpiece 4 is pressed against the body for injecting, but equally to cause atomizing to take place when the mouthpiece 4 is moved away from the 5 body.
The nozzle 18 is formed such that for instance a star-shaped marking is applied to the skin. It is of course likewise possible for other figures to be formed, for instance circles, squares, triangles etc. It is also 10 possible to adapt the form of the marking by means of the edge 15 with the recess 16 or another body for placing between the skin and the nozzle.
The construction of the discharging and safety mechanism will now be elucidated with reference to figure 15 4. In housing 2 is arranged a frame 21 made of metal in which the relevant components are mounted.
The internal barrel 22 through which the carriers are fired is fixedly connected to frame 21. The external barrel 3 shown in the foregoing figures, which is axially 20 movable relative to the barrel 22, is connected to a bridge 23 which is connected to two rods 24,25 which extend through frame 21 and which are guided through the transverse walls forming part of frame 21. It is possible to make use of other connecting elements instead of a 25 concentric barrel. When the external barrel 3 is moved in axial direction the rods 24,25 move therewith. Two rollers 26,27 are mounted on the rods 24,25. Made in the rollers are grooves 28 which have a substantially semi-cylindrical cross section, wherein the rollers are placed 30 relative to each other such that they are almost mutually impinging and both semi-cylindrical grooves 28 together form a cylindrical opening which forms the chamber of the discharging device.
Figure 5 shows the same device, but from the other 35 side. The rods 24,25 are each connected to an L-shaped body 29 respectively 30 which are mutually joined by means of a shaft 31. Mounted on shaft 31 is a hook 32 which, when the rods are moved rearward in figure 4, is CA 02203778 1997-04-2~
W O96/13300 PCT~NL95/00375 also carried along rearward by means of the angle pieces 29,30 and the shaft 31.
The hook 32 engages on a shoulder of a torpedo-shaped body 32 which is mounted on a shaft 33 extending 5 parallel to the rods 24,25. By means of a helical spring 34 wound round shaft 33 the torpedo-shaped body 32 is urged forward. Arranged inside shaft 33 is a thrust shaft 35 which, when the ~orpedo-shaped body 32 moves forward in the direction of arrow 36, strikes thrust shaft 35.
Thrust shaft 35 is in turn adapted to lift the ball 37 of a ball valve 38. The latter is arranged between a pressurized air line 39 connected to reservoir 9 and a pressurized air line 40 which leads to the chamber 41 formed by two semi-cylindrical openings 28. When the 15 barrel 3 is thus moved rearward when the mouthpiece 4 makes contact with a body for injecting, the bridge 23, the rods 24,25, the L-shaped bodies 29,30, the shaft 31, the hook 32 and therewith the torpedo-shaped body 32 are thereby moved rearward as far as a stop which is formed 20 by the rear wall of frame 21.
Arranged on the top part of hook 22 is a ball 42 which, as it approaches the stop, rises against an in-clining wall 43, whereby the hook is raised and the torpedo-shaped body 32 shoots forward as a result of the 25 spring pressure generated by spring 34, strikes the thrust shaft 35 and the valve 37 is lifted counter to the spring force of the spring 42 arranged therein.
A determined quantity of pressurized air from the pressurized gas cylinder 9 is thus fed to the chamber 41, 30 whereby the carrier 10 is expelled through the internal barrel 22. As a result of the action of helical springs 45,46 arranged on rods 24,25, the rods and the barrel , spring are then urged back to their original position. It will thus be apparent that by pressing the mouthpiece . _ 35 against a body for injecting, a carrier present in chamber 41 is injected.
When the apparatus is moved away from the body for injecting, transport of the belt 11 takes place by means CA 02203778 1997-04-2~
W 0961~33~0 PCTA~L95100375 of a worm wheel and freewheel me~h~n; m (not shown) by operating the roller 27. It is of course also possible to have this take place during the movement in the reverse direction.
A number of the safety mechanisms forming part of the safety system will now be elucidated.
A first sa~ety mechanism is ~ormed by the trigger 8 which is connected to the lever 9. When trigger 8 is not actuated and the lever 9 is situated in the position 10 shown in ~igure 4, the rearward movement of rods 24,25 and the components connected thereto is blocked by a connecting block 47 which is connected to both rods and the rearward movement of which is prevented by the lever 46. Only when the trigger 8 is actuated can the bridge 47 15 move to the rear and a carrier 10 be discharged.
A further safety mechanism is formed by a pressure measuring element. As shown most clearly in figure 5, on the right-hand side of the wall 48 ~orming part of frame 41, i.e. in the space 49 arranged there, prevails the 20 pressure o~ the pressurized gas present in the pressurized gas cylinder 9. This pressure presses outward a pin 50 arranged in the relevant wall 48.
On the relevant side of wall 48 is mounted a shaft 51 on which a U-shaped lever 52 is fixed. The U-shaped 25 lever comprises an L-shaped lever 53 which is pressed against the wall 48 by means of springs 54 arranged on shaft 51. Only when the pressure inside chamber 49, that is the pressure of the pressurized gas inside pressurized gas cylinder 9, reaches a determ;ne~ value is the force 30 exerted by the pin 50 such that it moves the U-shaped lever 52 downward counter to the spring pressure of springs 54, whereby movement of the torpedo-shaped body 32 is released. When however this pressure is too low, the U-shaped lever 52 is situated in its uppermost po-35 sition whereby movement of the torpedo-shaped body 32 is prevented, as is discharging of a carrier.
Figure 6 further shows an alternative embodiment of the mouthpiece. This alternative mouthpiece 56 is con-CA 02203778 1997-04-2~
W O96/13300 PCTn~L95/00375 structed wholly concentrically round the barrel 22. The edge 57 of the mouthpiece is here also provided with six recesses S 8 which in the present case are distributed evenly along the round edge 57.
Between each of the recesses 58 are thus created tooth-like protrusions 71. The edge 57 of each of the v protrusions 71 is defined by an imaginary truncated cone, the axis of which coincides with the axis of the barrel 3. Due to the truncated cone form the contact surfaces 57 10 are each provided with a flat portion 72 and the in-clining portion 73 which is located further to the outside and the form of which is defined by the cone.
This ~orm has the advantage that only by pressing the apparatus according to the invention against the skin of 15 the body for injecting at a determined angle can sufficient force be built up to depress the mouthpiece 56 sufficiently far to enable discharging. This will in any case prevent the apparatus being fired when the angle at which it is pressed against the skin differs greatly from 20 an angle of 90; this would result in a carrier entering the body obliquely which, as already explained, is undesirable. At a larger angle the apparatus will slip on the skin due to the oblique surface portions 72.
In order to prevent slippage when the apparatus is 25 pressed against the body at a correct angle, tooth-like protrusions 74 are arranged on the flat portions 72. e The shown form of the teeth has the further ad- _ vantage that, as stated above in the preamble, it becomes possible to deflect the air flow coming from the barrel 30 and preceding the carrier, with the useful effect that the hairs are blown aside in a ring shape from the position where the carrier enters the body, and wherein cont~m;n~nts which may be present are also carried away.
Furthermore, the gas flow expelling the carrier is like-35 wise carried away without having the opportunity to enter the body, which of course is likewise less desirable.
In addition, two reservoirs 58,59 are arranged here which are each provided with a liquid and which are CA 02203778 1997-04-2~
W O96113~00 ' PCTA~L95100375 activated when the mouthpiece 56 is pressed against a body for injecting. It is for instance possible herein for the one reservoir 58 to contain a marking fluid, 0 wherein the marking fluid is atomized by the atomizer 60 5 connected thereto to indicate that the relevant body has been injected, while the other liquid reservoir 59 can for instance contain a disinfectant liquid which can be atomized either before or after injection to disinfect the wound formed by injecting the carrier.
It is noted herein that it is possible to disinfect or to mark prior to discharging of the carrier, that is before the actual injecting operation, or to disinfect or mark after injection. It is even possible to mark before injecting and then to disinfect or vice versa. It will be 15 apparent that diverse other possible constructions for mouthpieces are also possible.
This is elucidated with reference to figures 7-9 in which a second alternative embodiment of a mouthpiece is shown. This is formed by a mouthpiece 63 inside which is 20 received a reservoir 64 for liquid for atomizing which is connected to the internal barrel 22 by means of a bracket 65 and which can be operated by means of a thrust disc 66 and a helical spring 67.
Figure 7 shows the rest position, wherein figure 8 25 shows how by pressing the mouthpiece 63 against a body 68 discharging of a carrier 10 is initiated, wherein in figure 8 is shown that carrier 10 leaves the barrel 22.
With further pressing an atomizer 69 accommodated in bracket 65 is activated, which atomizes a relevant 30 quantity of the liquid held in reservoir 64.
The design of the mouthpiece is preferably chosen such that it is possible to inject at an angle of a m~;mllm of about 30 to the normal of the plane in which the housing of the body to be injected is located. If the 35 angle is larger the mouthpiece slips and it is no longer possible to depress the mouthpiece so far that a carrier can be fired.
This angle of course depends on the form of the CA 02203778 1997-04-2~
W O96113300 PCT~NL95/00375 carrier, in particular the tip of the carrier. When the tip is sharp, i.e. the tip has a cone shape with a small apex angle, injection can take place at a larger angle to the normal. This is also the case when the radius of the 5 rounding of the tip is small.
Figures 10-13 show schematically how carrier 10 enters the body for injecting. The mouthpiece and the barrel are only shown schematically here. The body for injecting 68 is provided with a skin 69 on which are 10 situated hairs 70.
As shown in figure 10, the carrier 10 leaves the mouth of the barrel 3 and then cuts through the skin 69, wherein the carrier 10 enters the underlying tissue 68.
The carrier 10 will continue its movement in the tissue 15 68 until this is damped by the density of the tissue 68 and the carrier comes to a stop.
Such a situation is shown in figure 12. It can also be seen in this figure that as a result of the dynamic phenomena in the underlying tissue a cavity 70 forms 20 behind carrier 10 which closes after damping of the movement phenomena, whereafter the situation shown in figure 13 is obtained. ~ere can be seen that only a very small wound results which heals easily. The carrier is subsequently broken down in the body, wherea~ter the 25 pharmaceutical substance present in the carrier can perform its curative function. This is further described in the international patent application with publication number W0-93/23110.
It is pointed out that, as can be seen in figure 10, 30 the air flow moving ahead of the carrier 10 blows aside the hairs 70 at the position where carrier 10 will enter the body, so that the hairs will not make entry of the ~ _ carrier difficult. Blowing aside of the hairs moreover prevents the hairs being carried by the carrier into the . _ 35 wound, which would complicate healing of the wound.
Cont~m;n~nts which may be present at the relevant po- _ sition are also carried away.
This provides the option of performing the disin--W O96/13300 PCT~NL9510037 fecting spray treatment only after entry of the carrier, which is the opposite of what is usual in the medical and veterinary arts.
In figure 14 is shown an alternative embodiment of 5 an apparatus according to the invention. This embodiment comprises two plates 71, 72 respectively which are mutually connected on their end by means of a hinge 73.
Plates 71,72 are somewhat rounded at their other end and are slightly widened in the vicinity of this free end.
10 Each of the plates 71,72 is provided on the inner side with a friction-increasing layer 73. Instead of a roughened surface it is now possible to make use of for instance ribs.
Arranged on plate 72 is a ch~nn~l 74 with a sub-15 stantially circular diameter. In the vicinity of the endof plate 72 and of ch~nnel 74, although still at a distance therefrom, an opening 75 is arranged in rh~nne 74, the length of which opening is at least as great as the length of the carriers for introducing with the 20 present apparatus.
Movable in the channel is a plunger 76 which is joined to a pressing element 77 which can be operated with the thumb. Around a part of the channel is arranged a shell 78 outside which the pressing element 77 extends.
A similar shell 79 is otherwise mounted on the other plate 71, which shell is provided with a thickening 80 to define the correct position of the fingers.
The operation of this apparatus is as follows: a fold of skin of an ~nim~l for injecting is grasped by 30 hand, as shown in figure 14, wherein on each of the sides of the fold of skin is placed a plate 71, respectively 72 c and the two plates are then pressed together counter to the spring pressure of spring elements 81 fixed at the hinge 73. A carrier to be injected can subsequently be 35 placed in the opening 75 which can then be pushed inside through the skin by pressing with the thumb against the pressing element 77 by means of the plunger 76, in a m~nnPr which is otherwise per se known with a so-called W O96/13300 PCT~YLS5/0037 trocar.
It is herein noted that by fold of skin is not only understood an actual fold of skin but also for instance a protruding soft body part, for instance an auricle. It is 5 also important here that it is possible by means of the invention to obtain fixation of the injectiny apparatus relative to the skin, which in the prior art is not possible. It will be apparent that with this "trocar"-like injecting apparatus it is also possible to use a 10 fixation device as used in the initially described em-bodiment; the reverse is however e~ually possible; with an injecting apparatus operating with pressurized gas it is likewise possible to employ a clamping device for fixation purposes.
It will be apparent that the construction of the apparatus according to the invention can be changed in diverse ways without departing from the inventive con-cept. It is thus possible in the initially described embodiment to fix the container for pressurized gas to 20 the apparatus in another manner and to assign it a dual function, for instance the additional function o~ hand-grip. There are of course also numerous possibilities for making a construction as described with reference to figures 4 and 5, particularly in respect of the safety 25 mechanisms.
Claims (20)
1. Apparatus for injecting the body of humans or animals with a pharmaceutical preparation, wherein the preparation is arranged in a rigid carrier, wherein the apparatus comprises:
- a chamber into which the carrier can be transported;
and - a non-penetrating channel connecting onto the chamber for transporting the carrier into the body, characterized by - fixation means for fixing the end of the channel relative to the skin of the body for injecting in order to prevent a movement of the channel in the direction perpendicularly of the axis of the barrel.
- a chamber into which the carrier can be transported;
and - a non-penetrating channel connecting onto the chamber for transporting the carrier into the body, characterized by - fixation means for fixing the end of the channel relative to the skin of the body for injecting in order to prevent a movement of the channel in the direction perpendicularly of the axis of the barrel.
2. Apparatus as claimed in claim 1, characterized in that the fixation means are adapted for clamping engagement on the skin.
3. Apparatus as claimed in claim 1, characterized in that the fixation means are formed by chamfered protrusions formed on the part adapted for contact with the skin of the body and extending substantially in the direction of the axis of the channel.
4. Apparatus as claimed in claim 1, 2 or 3, characterized in that the channel is formed by a barrel connecting onto the chamber, and that the apparatus further comprises:
discharging means for supplying pressurized gas to the chamber for expelling the carrier through the barrel;
and - a spacer element which extends round the mouth of the barrel and which is adapted to direct the air flow preceding the carrier during discharging such that the air flow is guided at least partially along at least that part of the skin of the body for injecting where the carrier subsequently enters the skin.
discharging means for supplying pressurized gas to the chamber for expelling the carrier through the barrel;
and - a spacer element which extends round the mouth of the barrel and which is adapted to direct the air flow preceding the carrier during discharging such that the air flow is guided at least partially along at least that part of the skin of the body for injecting where the carrier subsequently enters the skin.
5. Apparatus as claimed in claim 4, characterized in that the spacer element is adapted to hold the mouth of the barrel at a distance from the body for injecting at least during discharging.
6. Apparatus as claimed in claim 5, characterized in that the spacer element is provided with recesses.
7. Apparatus as claimed in any of the foregoing claims, characterized in that the apparatus is provided with a safety device for only releasing the discharging means when the spacer element is arranged against a body for injecting and the spacer element is displaced relative to the barrel through a minimum distance in axial direction of the barrel.
8. Apparatus as claimed in claim 6, characterized in that the engaging means are adapted to allow a movement relative to the skin of the animal for injecting when the engaging means are placed at an angle relative to the normal of the skin which is greater than a predetermined angle.
9. Apparatus as claimed in claim 7, characterized in that the predetermined angle equals 30°.
10. Apparatus as claimed in claims 7 and 8 or 9, characterized in that the force with which the spacer element must be depressed to displace the spacer element through the predetermined distance can only be generated at an angle smaller than the predetermined angle relative to the normal.
11. Apparatus as claimed in claim 7, 8, 9 or 10, characterized in that on the side adapted for contact with the skin the spacer element has the form of a truncated cone, the apex angle of which equals 180°, twice the predetermined angle.
12. Apparatus as claimed in claims 6 and 11, characterized in that the protrusions are arranged on the truncated part of the cone.
13. Apparatus as claimed in any of the foregoing claims, comprising a container for pressurized gas, characterized in that the safety device is adapted to release the discharging means only when the pressure prevailing in the container is greater than a predetermined value.
14. Apparatus as claimed in any of the foregoing claims, characterized in that the sensor element is connected to an atomizer.
15. Apparatus as claimed in any of the foregoing claims, characterized in that the safety element is connected to transport means for transporting the carriers during discharging of a carrier.
16. Apparatus as claimed in claim 15, characterized in that the transport means are adapted to transport the carriers during the return stroke of the safety means.
17. Apparatus as claimed in claim 16, characterized in that the transport means are formed by rollers mounted on the system of rods and provided with grooves, wherein the form of the grooves corresponds with the form of the carriers arranged in a packaging.
18. Apparatus as claimed in claim 17, characterized in that the rollers are driven by means of a worm wheel.
19. Apparatus as claimed in claim 17 or 18, characterized in that at least one of the carriers is arranged spring-mounted on the shaft in radial direction.
20. Apparatus as claimed in claim 1, 2 or 3, characterized in that the apparatus comprises two plates mutually connected for pivoting on their ends, wherein a channel is fixed to one of the two plates and wherein a manually operable plunger is arranged for introducing the carrier into the body.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL9401805A NL9401805A (en) | 1994-10-31 | 1994-10-31 | Device for firing a rigid carrier by means of compressed air. |
| NL9401805 | 1994-10-31 | ||
| PCT/NL1995/000375 WO1996013300A1 (en) | 1994-10-31 | 1995-10-31 | Apparatus for injecting a rigid carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2203778A1 true CA2203778A1 (en) | 1996-05-09 |
Family
ID=29405430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2203778 Abandoned CA2203778A1 (en) | 1994-10-31 | 1995-10-31 | Apparatus for injecting a rigid carrier |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2203778A1 (en) |
-
1995
- 1995-10-31 CA CA 2203778 patent/CA2203778A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |