reference now will be made in detail to presently preferred embodiments of the invention , one or more examples of which are illustrated in the accompanying drawings . each example is provided by way of explanation of the invention , not limitation of the invention . in fact , it will be apparent to those skilled in the art that various modifications , combination , additions , deletions and variations can be made in the present invention without departing from the scope or spirit of the invention . for instance , features illustrated or described as part of one embodiment can be used in another embodiment to yield a still further embodiment . it is intended that the present invention covers such modifications , combinations , additions , deletions and variations as come within the scope of the appended claims and their equivalents . the injection delivery devices and systems according to the present invention are useful to deliver substantially simultaneously multiple fluid doses to a recipient such as small birds . the devices and systems of the present invention are particularly useful for delivering fluids that cannot be stably stored or mixed together . the injection delivery systems of the present invention also allow the co - delivery of vaccines such as herpes virus of turkey ( hvt ) vaccine with compositions such as antibiotics that may otherwise reduce the therapeutic efficacy of a live virus vaccine . referring now to fig1 the present invention provides an injection needle support 10 adapted to receive at least two injection needles 14 , 15 . the injection needle support 10 comprises a base 38 having a base plate 30 and an end plate 11 disposed thereon . the base 38 may be any geometric shape , such as square , rectangular , circular or the like , that will rigidly hold the base plate 30 and the end plate 11 in a fixed spatial relationship . the base 38 may be a solid plate or a frame defining a hole as shown , for example , in fig1 . in preferred embodiments , the base 38 is triangular or trapezoidal , with the end of the base 38 having the end plate 11 thereon being narrower than the end having the base plate 30 , as shown in fig1 . the end plate 11 has at least two substantially parallel bores 21 , 22 , each bore capable of receiving a shank 23 , 24 of one of the injection needles 14 , 15 . suitable injection needles 14 , 15 for use in the system of the present invention each generally will comprise a hub or distal end 17 , 18 and an injection or proximal end 25 , 26 disposed at the opposite end of the shank 23 , 24 . preferably , the injection end 25 , 26 of each needle is sharpened to ease penetration of the skin of a recipient bird , and further is typically beveled . the injection needle support 10 of the present invention further comprises recesses 27 , 28 in the base plate 30 . the recesses 27 , 28 are configured to receive the hubs 17 , 18 of the injection needles 14 , 15 and which may be held in position in the recesses 27 , 28 by a releasable or backing plate clamp 12 . the claim generally will be secured with a set screw or similar fastener 13 to prevent the needle hubs 17 , 18 from disengaging from the recesses 27 , 28 . fluid connections 19 , 20 provided , and generally are mounted in communication with the recesses 27 , 28 and are also able to engage with the hubs 17 , 18 held in the recesses 27 , 28 , thereby allowing fluids to pass into the injection needles 14 , 15 from a fluid supply source ( not shown ). the injection needles 14 , 15 may be attached to the injection needle support 10 by passing the injection end 25 , 26 of a injection needle 14 , 15 through a bore 21 , 22 and placing a hub 17 , 18 in a recess 27 , 28 of the base plate 30 . the clamp 12 is then positioned on the base plate 30 and secured over the needle hubs to prevent the hubs 17 , 18 from being displaced from the recesses 27 , 28 and the injection needle support 10 . in one embodiment of the present invention , the clamp 12 is a detachable plate . in another embodiment , the clamp 12 can be connected to the injection needle support 10 along a hinge mechanism that allows the clamp to the be displaced , but not removed from , the injection needle support 10 . exemplary fasteners for securing the clamp 12 in a closed configuration and which can be easily released to allow the injection needles 14 , 15 to be easily replaced when blunted , blocked or otherwise becomes unsuitable for injecting birds include , but are not limited to , a screw means or opposed polarity magnets , and the like . the injection needles 14 , 15 can be replaced by releasing fasteners 13 of the clamp 12 , lifting the hub 17 , 18 from the recess 27 , 28 , disconnecting the needles 14 , 15 from fluid connectors 19 , 20 , and extracting the respective needle 14 , 15 from the end plate 11 of the needle support . substitute injection needles 14 , 15 may then be introduced to the injection needle support 10 by reversing this order of operation . in one embodiment of the present invention , the distance separating the recesses 27 , 28 from one another exceeds the distance between the bores 21 , 22 . in such an embodiment , the injection ends 25 , 26 of injection needles 14 , 15 , once placed into position in the injection needle holder 10 , generally will remain substantially parallel while the shanks 23 , 24 between the hubs 17 , 18 and the end plate 11 are curved . however , the shanks 23 , 24 preferably are not bent , so as to thus maintain unimpeded fluid flows through the cannula of the needles 14 , 15 . alternatively , the distance separating the recesses 27 , 28 can be about , or substantially the same as the distance between the bores 21 , 22 of the plate 11 so that the needle shanks 23 , 24 are substantially parallel . in the various embodiments of the injection delivery systems of the present invention , the injection ends 25 , 26 of the injection needles 14 , 15 , when inserted into the injection needle support 10 , will project beyond the end plate 11 . the extent to which the injection ends 25 , 26 project beyond the end plate 11 may be selected manually or automatically according to the type or size of the recipient birds . the selected length of the injection ends 25 , 26 of the needles and the degree of the extension movement of the carrier 4 imparted by the actuator 6 also determines whether the injection of fluid ( s ) into the recipient bird is subcutaneous or intramuscularly by affecting the depth of penetration of the needles . injection needles 14 , 15 suitable for use in the present invention may be from 2 - 20 gauge . preferably , the injection ends 25 , 26 are sharpened and beveled . for example , beveled injection ends 25 , 26 orientated in substantially opposite directions are shown in fig1 . this substantially opposed orientation of beveled injection ends 25 , 26 can direct injected fluids in divergent directions to reduce potential co - mingling of incompatible fluids within the tissues of the recipient bird . as illustrated in fig2 a and 3 , the present invention provides an injection needle support 10 connected to a carrier 4 slidably disposed in a guide 5 . the carrier 4 is operably connected to an actuator 6 configured to reciprocally move the carrier 4 and injection needle support 10 from a retracted position to an extended injection position . suitable actuators 6 include , but are not limited to , a solenoid , electric motor or driver , or a hydraulic actuator , the selected actuator 6 further comprising a power source . the actuator 6 is also operably connected to a switch 35 that may include , but is not limited to , a manually activated switch , or an automatic switch such as a pressure switch or sensor , or a photoelectric switch . it is contemplated that the switch will be reversible so that in a first position the carrier 4 and injection needle support 10 are extended by the actuator 6 , and in a second position the carrier 4 and the injection needle support 10 may be retracted away from the injected recipient bird . it is further contemplated that the carrier 4 and the injection needle support 10 may be automatically retracted , for example , by a spring - biased device , for example , once the actuator 6 is deactivated . the injection delivery system of the present invention further comprises one or more dose distributors 31 , 32 communicating with the fluid connectors 19 , 20 for the needles 14 , 15 . suitable fluid distributors 31 , 32 for use in the present invention include , but are not limited to , pumps or syringes , such as a multi - dose syringe and the like that are capable of receiving a fluid dose from fluid containers or supplies 33 , 34 and delivering the fluid dose to an injection needle 14 , 15 . each fluid container 33 , 34 is preferably connected to a dose distributor 31 , 32 by a two - way valve 36 , 37 that allows a fluid dose to be withdrawn from the fluid container 33 , 34 and delivered to the injection needle 14 , 15 without back - flow to the fluid container 33 , 34 . in one embodiment of the injection delivery system of the present invention , each dose distributor 31 , 32 is attached to the carrier 4 or to injection needle support 10 such that the dose distributor 31 , 32 will move with the carrier 4 and injection needle support 10 . in another embodiment , dose distributors 31 , 32 may be separate from the carrier 4 and the injection needle support 10 and connected to the fluid connectors 19 , 20 by flexible fluid ducts or lines 8 , 9 . in these embodiments of the present invention , the fluid container 33 , 34 also may be optionally attached to the carrier 4 or injection needles support 10 , or attached to a fixed structure such as a housing ( fig3 ). the fluid container 33 , 34 likewise can communicate with the dose distributor 31 , 32 by a flexible or rigid fluid duct 8 , 9 . the injection delivery system further generally includes a control means and power source to activate the dose distributors 31 , 32 to deliver at least two fluid doses to a bird maintained against the retaining plate 2 , and cause movement of the needle support to its operative injection position . the needle injection device of the present invention further generally includes a retaining plate 2 having an aperture 3 therein . the retaining plate 2 and the aperture 3 are positioned so that when the carrier 4 and the injection needle support 10 are in an extended position , the injection ends 25 , 26 project through and beyond the aperture 3 to a selected distance that allows injection of a fluid dose into a recipient bird . the chick or other small bird can be slightly pressed against the retaining plate 2 by the operator or otherwise restrained in a desired position for injection . the retention means also may be sloped with regard to the travel axis of the needles . in operation of the injection delivery systems of the present invention , a chick or other small bird is maintained against the retaining plate 2 with the area of the bird to receive the fluid dose ( s ) positioned over the aperture 3 in the retaining plate 2 . generally , the neck of the bird is the targeted area , but any other areas of the bird , including the breast , thigh , wing and the like may be selected to receive the delivered fluid dose . an optional restraint may be used to prevent escape of the bird . pressure of the bird against the retaining plate 2 can engage and actuate a switch to activate the actuator 6 to move the carrier 4 and the injection needle support 10 attached thereto , to a predetermined extended operative injection position . the injection ends 25 , 26 of the needles 14 , 15 project through the retaining plate 2 and the aperture 3 therein , to penetrate the skin overlying the selected injection point of the bird . when the carrier 10 and the needles 14 , 15 thereon are in the extended position with the injection 25 , 26 ends , in the bird , the dose distributors 31 , 32 are actuated by a switch means activated automatically , as described in u . s . patent ser . no . 5 , 312 , 353 incorporated herein by reference in its entirety , or by a system operator to deliver the fluid doses through their respective needles 14 , 15 . the volumes for the delivered doses are selected depending on the treatment protocol administered to the birds . a suitable adjustment means , for example , as taught in u . s . pat . no . 5 , 312 , 353 can administer doses from 0 . 05 to 4 ml per dose . the volumes can be identical or different between needles . it is contemplated to be within the scope of the present invention for the fluid doses delivered to a recipient bird to be the same therapeutic fluids or different . the delivery systems of the present invention can deliver the same fluid to two different positions in the bird or two different fluids that may be incompatible or unstable when mixed .
the present invention provides systems for the injection delivery of at least two fluid doses to a small bird by penetrating the skin of the recipient bird with at least two injection needles . it is then possible to simultaneously inject drugs , or other fluid vaccines that do not mix well or whose mixture would be detrimental to the stability or efficacy of the active ingredients therein . the present invention provides a novel injection needle support for connecting the injection needles to dose distributors and fluid supply containers while maintaining the injection ends of the injection needles in a substantially parallel arrangement . the injection needle support typically is attached to a carrier connected to an actuator , an actuator power source and a switch mechanism wherein the actuator , when activated , can reciprocally move the carrier and injection support toward and away from an injection position . the injection delivery system may further include one or more dose distributors and fluid supply containers for delivering fluid doses to the injection needles for injection into a recipient bird held against an aperture in a retaining plate .