Automatic needle device

• US 20070118081A1
• Filed: 09/08/2006
• Published: 05/24/2007
• Est. Priority Date: 09/17/2003
• Status: Active Grant

• Current Assignee: Dali Medical Devices Ltd
• Original Assignee: Dali Medical Devices Ltd
• Inventors: Daily, David, Raday, Lior
• Granted Patent: US 7,901,382 B2
• Time in Patent Office: Days
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 2005/3267 Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• CPC Class Codes: A61M 5/347 rotatable, e.g. bayonet or screw A61M5/344 takes precedence
• CPC Class Codes: A61M 5/425 Protruding skin to facilitate piercing, e.g. vacuum cylinders, vein immobilising means

Abstract

An automatic needle device including a housing element, at least one resilient element arranged to be located within the housing element, at least one needle bearing element adapted, when actuated, to be displaced by the at least one resilient element with respect to the housing element from a non-penetration position to a penetration position and a needle guard adapted for positioning with respect to the housing element and wherein displacement of the needle guard is operative to actuate displacement of the at least one needle bearing element from the non-penetration position to the penetration position.

Claims

1. An automatic needle device comprising:

a housing element;

at least one resilient element arranged to be located within said housing element;

at least one needle bearing element adapted, when actuated, to be displaced by said at least one resilient element with respect to said housing element from a non-penetration position to a penetration position; and

a needle guard adapted for positioning with respect to said housing element and wherein displacement of said needle guard is operative to actuate displacement of said at least one needle bearing element from said non-penetration position to said penetration position.

2. An automatic needle device according to claim 1 and wherein rearward displacement of said needle guard is operative to actuate displacement of said at least one needle bearing element from said non-penetration position to said penetration position.

3. An automatic needle device according to claim 1 and also comprising a safety element adapted to prevent inadvertent actuation of displacement of said at least one needle bearing element.

4. An automatic needle device according to claim 3 and wherein said safety element prevents inadvertent rearward displacement of said needle guard.

5. An automatic needle device according to claim 1 and wherein said at least one resilient element comprises a unitary resilient element.

6. An automatic needle device according to claim 1 and wherein said at least one resilient element comprises first and second coil springs.

7. An automatic needle device according to claim 1 and wherein said housing element includes an injection device engagement portion.

8. An automatic needle device according to claim 7 and wherein said housing element and said at least one needle bearing element together define a fluid pathway from said injection device engagement portion through said needle at least when said needle bearing element is in both said non-penetration position and said penetration position.

9. An automatic needle device according to claim 1 and wherein said needle guard is displaceable by said at least one resilient element.

10. An automatic needle device according to claim 1 and wherein said at least one resilient element comprises first and second compression springs which provide selectable forward displacement to said at least one needle bearing element.

11. An automatic needle device according to claim 1 and wherein said needle bearing element includes a hub portion and a needle adhered thereto and extending through a septum.

12. An automatic needle device according to claim 1 and also comprising a safety tab operative for disabling actuation of the automatic needle device.

13. An automatic needle device according to claim 12 and wherein said safety tab includes a spacer portion and a tab portion.

18. An automatic needle device according to claim 1 and wherein said housing element is an integrally formed element having a generally cylindrical configuration and is generally top-to-bottom and side-to-side symmetric about a longitudinal axis.

19. An automatic needle device according to claim 1 and wherein said housing element includes a rearward generally tubular portion which terminates in an open back and defines forwardly thereof a generally cylindrical portion, whose outer configuration includes top and bottom grip regions.

20. An automatic needle device according to claim 1 and wherein said housing element includes first and second forwardly and rearwardly tapered side protrusions.

21. An automatic needle device according to claim 19 and comprising at an inner surface of said generally cylindrical portion forward and rearward inwardly extending transverse ribs and a plurality of inwardly extending longitudinal slots.

25. An automatic needle device according to claim 1 and wherein said housing element is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle held by said needle bearing element.

26. An automatic needle device according to claim 1 and wherein said needle bearing element comprises a needle hub and a needle.

27. An automatic needle device according to claim 26 and wherein said needle bearing element has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

28. An automatic needle device according to claim 26 and wherein said needle bearing element defines a generally tubular body having formed thereon a pair of up-down mutually spaced, forwardly facing, outwardly extending hook protrusions.

29. An automatic needle device according to claim 28 and wherein said protrusions are each associated with a rearward facing rib.

30. An automatic needle device according to claim 28 and wherein a rearwardly extending arm is formed at both a top and a bottom of said tubular body, each arm including, adjacent an extreme rearwardly facing end thereof, a tapered inwardly facing tooth and forwardly thereof an outwardly facing tooth, having a transversely extending rearwardly facing surface.

31. An automatic needle device according to claim 28 and wherein top and bottom pairs of outwardly facing ribs are formed on said tubular portion, adjacent respective rearward facing ribs, said outwardly facing ribs being operative to slidably locate said needle bearing element within said needle guard.

32. An automatic needle device according to claim 28 and wherein said tubular body defines a generally open back and a forward facing wall portion adjacent in which is formed a recess, which communicates with a narrow axial bore, arranged to receive said needle, which extends therethrough.

33. An automatic needle device according to claim 28 and wherein a rearward facing external wall portion, located at a rearward end of said tubular body, defines a seat for said at least one resilient element.

34. An automatic needle device according to claim 1 and wherein said needle guard has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

35. An automatic needle device according to claim 1 and wherein said needle guard defines a generally tubular body having formed thereon a plurality of circumferentially spaced, longitudinally extending, outward facing ribs, having rearward facing ends, said outward facing ribs being adapted to slidably locate said needle guard within inwardly extending longitudinal slots of said housing element.

36. An automatic needle device according to claim 35 and wherein extending rearwardly of said outwardly facing ribs there is provided a curved rearward facing portion having a pair of inwardly facing ribs formed therein, and, extending rearwardly of said ribs, there is formed a symmetrically curved rearward facing portion having a pair of ribs formed therein.

37. An automatic needle device according to claim 36 and wherein said curved rearward facing portions together with said rearward facing ends define a seat for a spring forming part of said at least one resilient element.

38. An automatic needle device according to claim 36 and wherein said inwardly facing ribs are operative to slidably locate said needle bearing element within said needle guard, by allowing said outwardly facing ribs to slide therein.

39. An automatic needle device according to claim 35 and wherein a rearwardly extending arm is formed at each side of said tubular body, each of said arms including adjacent an extreme rearwardly facing end thereof, an outwardly facing tooth, having an inclined forward surface and a transversely extending rearwardly facing surface.

40. An automatic needle device according to claim 35 and wherein said tubular body defines a generally open back and a forward facing wall portion, defining an injection site engagement surface.

41. An automatic needle device according to claim 40 and wherein said injection site engagement surface includes a pair of mutually concentric circles of mutually spaced forwardly extending protrusions and said forward facing wall portion is formed with an axial bore, arranged to allow a needle to extend therethrough.

42. An automatic needle device according to claim 1 and wherein said needle guard is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle.

43. An automatic needle device according to claim 1 and wherein, in a pre-use operative orientation suitable for storage, said housing element is joined to said needle bearing element by snap fit engagement of inner facing teeth formed on said needle bearing element into apertures formed in cylindrical walls of said housing element.

44. An automatic needle device according to claim 43 and wherein said at least one resilient element comprises first and second compression springs, said first compression spring being maintained under compression between forward-facing back wall surface of a generally cylindrical portion of said housing element and a rearward facing wall portion of said needle bearing element and said second compression spring being maintained under compression between said forward facing back wall surface and rearward facing ends of said needle guard, which is slidably retained against disassembly forward movement by the positioning of curved rearward facing portions thereof immediately rearward of said inner facing teeth of said needle bearing element

45. An automatic needle device according to claim 43 and wherein said needle bearing element is retained in its place by engagement of rearwardly outwardly facing surfaces of said inner facing teeth with curved rearward facing portions of said needle guard, thus preventing rearwardly extending arms of said needle bearing element from bending outwardly and releasing the snap fit engagement of said inner facing teeth and apertures formed in the cylindrical walls of said cylindrical bore of said housing element.

46. An automatic needle device according to claim 43 and wherein due to engagement of said needle guard with an injection site on a body, said needle guard is forced, against the urging of said at least one resilient element, to move axially in a rearward direction with respect to the remainder of the automatic needle device, thus sliding said curved rearward facing portions thereof further rearward of said outwardly facing teeth of said needle bearing element, thus allowing said arms of said needle bearing element to cantilever outwardly.

47. An automatic needle device according to claim 43 and wherein at all times said needle sealingly and slidably engages a septum.

14. An automatic needle device comprising:

a housing element;

at least one needle bearing element adapted, when actuated, to be displaced with respect to said housing element from a non-penetration position to a penetration position; and

a needle guard adapted for positioning with respect to said at least one needle bearing element in a mutually locked needle guarding orientation, whereby displacement of said needle guard relative to said housing requires corresponding displacement of said at least one needle bearing element.

48. An automatic needle device according to claim 14 and wherein said housing element is an integrally formed element having a generally cylindrical configuration and is generally top-to-bottom and side-to-side symmetric about a longitudinal axis.

49. An automatic needle device according to claim 14 and wherein said housing element includes a rearward generally tubular portion which terminates in an open back and defines forwardly thereof a generally cylindrical portion, whose outer configuration includes top and bottom grip regions.

50. An automatic needle device according to claim 49 and comprising at an inner surface of said generally cylindrical portion forward and rearward inwardly extending transverse ribs and a plurality of inwardly extending longitudinal slots.

51. An automatic needle device according to claim 14 and wherein said housing element is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle held by said needle bearing element.

52. An automatic needle device according to claim 14 and wherein said needle guard has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

53. An automatic needle device according to claim 52 and wherein a rearwardly extending arm is formed at each side of said tubular body, each of said arms including adjacent an extreme rearwardly facing end thereof, an outwardly facing tooth, having an inclined forward surface and a transversely extending rearwardly facing surface.

54. An automatic needle device according to claim 52 and wherein said tubular body defines a generally open back and a forward facing wall portion, defining an injection site engagement surface.

55. An automatic needle device according to claim 14 and wherein said needle guard defines a generally tubular body having formed thereon a plurality of circumferentially spaced, longitudinally extending, outward facing ribs, having rearward facing ends, said outward facing ribs being adapted to slidably locate said needle guard within inwardly extending longitudinal slots of said housing element.

56. An automatic needle device according to claim 55 and wherein extending rearwardly of said outwardly facing ribs there is provided a curved rearward facing portion having a pair of inwardly facing ribs formed therein, and, extending rearwardly of said ribs, there is formed a symmetrically curved rearward facing portion having a pair of ribs formed therein.

57. An automatic needle device according to claim 14 and wherein said needle guard is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle.

58. An automatic needle device according to claim 14 and wherein, in a pre-use operative orientation suitable for storage, said housing element is joined to said needle bearing element by snap fit engagement of inner facing teeth formed on said needle bearing element into apertures formed in cylindrical walls of said housing element.

59. An automatic needle device according to claim 58 and wherein said at least one resilient element comprises first and second compression springs, said first compression spring being maintained under compression between forward-facing back wall surface of a generally cylindrical portion of said housing element and a rearward facing wall portion of said needle bearing element and said second compression spring being maintained under compression between said forward facing back wall surface and rearward facing ends of said needle guard, which is slidably retained against disassembly forward movement by the positioning of curved rearward facing portions thereof immediately rearward of said inner facing teeth of said needle bearing element

60. An automatic needle device according to claim 58 and wherein said needle bearing element is retained in its place by engagement of rearwardly outwardly facing surfaces of said inner facing teeth with curved rearward facing portions of said needle guard, thus preventing rearwardly extending arms of said needle bearing element from bending outwardly and releasing the snap fit engagement of said inner facing teeth and apertures formed in the cylindrical walls of said cylindrical bore of said housing element.

61. An automatic needle device according to claim 58 and wherein due to engagement of said needle guard with an injection site on a body, said needle guard is forced, against the urging of said at least one resilient element, to move axially in a rearward direction with respect to the remainder of the automatic needle device, thus sliding said curved rearward facing portions thereof further rearward of said outwardly facing teeth of said needle bearing element, thus allowing said arms of said needle bearing element to cantilever outwardly.

15. An automatic needle device comprising:

a housing element;

at least one needle bearing element adapted, when actuated, to be displaced with respect to said housing element from a non-penetration position to a penetration position; and

a needle guard adapted for positioning with respect to said at least one needle bearing element and with respect to said housing element in a mutually locked needle guarding orientation, whereby displacement of said needle guard in a first direction relative to said housing is prevented by engagement of said needle guard with said at least one needle bearing element and displacement of said needle guard in a second direction relative to said housing, opposite to said first direction, is prevented by engagement of said needle guard with said housing element.

22. An automatic needle device according to claim 15 and comprising at an interior of said generally tubular portion, a generally cylindrical bore which communicates via a tapered interface with a forward bore, disposed interiorly of said cylindrical portion, said cylindrical bore being arranged to receive a septum.

24. An automatic needle device according to claim 15 and wherein a forward-facing back wall surface of said generally cylindrical portion defines a seat for said at least one resilient element.

62. An automatic needle device according to claim 15 and wherein said housing element is an integrally formed element having a generally cylindrical configuration and is generally top-to-bottom and side-to-side symmetric about a longitudinal axis.

63. An automatic needle device according to claim 15 and wherein said housing element includes a rearward generally tubular portion which terminates in an open back and defines forwardly thereof a generally cylindrical portion, whose outer configuration includes top and bottom grip regions.

64. An automatic needle device according to claim 63 and comprising at an inner surface of said generally cylindrical portion forward and rearward inwardly extending transverse ribs and a plurality of inwardly extending longitudinal slots.

65. An automatic needle device according to claim 15 and wherein said housing element is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle held by said needle bearing element.

66. An automatic needle device according to claim 15 and wherein said needle guard has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

67. An automatic needle device according to claim 66 and wherein a rearwardly extending arm is formed at each side of said tubular body, each of said arms including adjacent an extreme rearwardly facing end thereof, an outwardly facing tooth, having an inclined forward surface and a transversely extending rearwardly facing surface.

68. An automatic needle device according to claim 66 and wherein said tubular body defines a generally open back and a forward facing wall portion, defining an injection site engagement surface.

69. An automatic needle device according to claim 15 and wherein said needle guard defines a generally tubular body having formed thereon a plurality of circumferentially spaced, longitudinally extending, outward facing ribs, having rearward facing ends, said outward facing ribs being adapted to slidably locate said needle guard within inwardly extending longitudinal slots of said housing element.

70. An automatic needle device according to claim 69 and wherein extending rearwardly of said outwardly facing ribs there is provided a curved rearward facing portion having a pair of inwardly facing ribs formed therein, and, extending rearwardly of said ribs, there is formed a symmetrically curved rearward facing portion having a pair of ribs formed therein.

71. An automatic needle device according to claim 15 and wherein said needle guard is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle.

72. An automatic needle device according to claim 15 and wherein, in a pre-use operative orientation suitable for storage, said housing element is joined to said needle bearing element by snap fit engagement of inner facing teeth formed on said needle bearing element into apertures formed in cylindrical walls of said housing element.

73. An automatic needle device according to claim 72 and wherein said at least one resilient element comprises first and second compression springs, said first compression spring being maintained under compression between forward-facing back wall surface of a generally cylindrical portion of said housing element and a rearward facing wall portion of said needle bearing element and said second compression spring being maintained under compression between said forward facing back wall surface and rearward facing ends of said needle guard, which is slidably retained against disassembly forward movement by the positioning of curved rearward facing portions thereof immediately rearward of said inner facing teeth of said needle bearing element.

74. An automatic needle device according to claim 72 and wherein said needle bearing element is retained in its place by engagement of rearwardly outwardly facing surfaces of said inner facing teeth with curved rearward facing portions of said needle guard, thus preventing rearwardly extending arms of said needle bearing element from bending outwardly and releasing the snap fit engagement of said inner facing teeth and apertures formed in the cylindrical walls of said cylindrical bore of said housing element.

75. An automatic needle device according to claim 72 and wherein due to engagement of said needle guard with an injection site on a body, said needle guard is forced, against the urging of said at least one resilient element, to move axially in a rearward direction with respect to the remainder of the automatic needle device, thus sliding said curved rearward facing portions thereof further rearward of said outwardly facing teeth of said needle bearing element, thus allowing said arms of said needle bearing element to cantilever outwardly.

16. An automatic needle device comprising:

a housing element adapted to be connected to an external injection device;

at least one needle bearing element adapted, when actuated, to be displaced with respect to said housing element from a non-penetration position to a penetration position; and

a needle guard adapted for positioning with respect to at least one of said at least one needle bearing element and said housing element in a needle guarding orientation.

76. An automatic needle device according to claim 16 and wherein said housing element is an integrally formed element having a generally cylindrical configuration and is generally top-to-bottom and side-to-side symmetric about a longitudinal axis.

77. An automatic needle device according to claim 16 and wherein said housing element includes a rearward generally tubular portion which terminates in an open back and defines forwardly thereof a generally cylindrical portion, whose outer configuration includes top and bottom grip regions.

78. An automatic needle device according to claim 77 and comprising at an inner surface of said generally cylindrical portion forward and rearward inwardly extending transverse ribs and a plurality of inwardly extending longitudinal slots.

79. An automatic needle device according to claim 16 and wherein said housing element is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle held by said needle bearing element.

80. An automatic needle device according to claim 16 and wherein said needle guard has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

81. An automatic needle device according to claim 80 and wherein a rearwardly extending arm is formed at each side of said tubular body, each of said arms including adjacent an extreme rearwardly facing end thereof, an outwardly facing tooth, having an inclined forward surface and a transversely extending rearwardly facing surface.

82. An automatic needle device according to claim 80 and wherein said tubular body defines a generally open back and a forward facing wall portion, defining an injection site engagement surface.

83. An automatic needle device according to claim 16 and wherein said needle guard defines a generally tubular body having formed thereon a plurality of circumferentially spaced, longitudinally extending, outward facing ribs, having rearward facing ends, said outward facing ribs being adapted to slidably locate said needle guard within inwardly extending longitudinal slots of said housing element.

84. An automatic needle device according to claim 83 and wherein extending rearwardly of said outwardly facing ribs there is provided a curved rearward facing portion having a pair of inwardly facing ribs formed therein, and, extending rearwardly of said ribs, there is formed a symmetrically curved rearward facing portion having a pair of ribs formed therein.

85. An automatic needle device according to claim 16 and wherein said needle guard is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle.

86. An automatic needle device according to claim 16 and wherein, in a pre-use operative orientation suitable for storage, said housing element is joined to said needle bearing element by snap fit engagement of inner facing teeth formed on said needle bearing element into apertures formed in cylindrical walls of said housing element.

87. An automatic needle device according to claim 86 and wherein said at least one resilient element comprises first and second compression springs, said first compression spring being maintained under compression between forward-facing back wall surface of a generally cylindrical portion of said housing element and a rearward facing wall portion of said needle bearing element and said second compression spring being maintained under compression between said forward facing back wall surface and rearward facing ends of said needle guard, which is slidably retained against disassembly forward movement by the positioning of curved rearward facing portions thereof immediately rearward of said inner facing teeth of said needle bearing element

88. An automatic needle device according to claim 86 and wherein said needle bearing element is retained in its place by engagement of rearwardly outwardly facing surfaces of said inner facing teeth with curved rearward facing portions of said needle guard, thus preventing rearwardly extending arms of said needle bearing element from bending outwardly and releasing the snap fit engagement of said inner facing teeth and apertures formed in the cylindrical walls of said cylindrical bore of said housing element.

89. An automatic needle device according to claim 86 and wherein due to engagement of said needle guard with an injection site on a body, said needle guard is forced, against the urging of said at least one resilient element, to move axially in a rearward direction with respect to the remainder of the automatic needle device, thus sliding said curved rearward facing portions thereof further rearward of said outwardly facing teeth of said needle bearing element, thus allowing said arms of said needle bearing element to cantilever outwardly.

17. An injection device comprising:

a housing element;

a unitary resilient element arranged to be located within said housing element, said unitary resilient element including a septum portion and at least one displacement actuating portion; and

at least one needle bearing element including a needle sealingly engaging said septum portion, said at least one needle bearing element adapted, when actuated, to be displaced by said at least one displacement actuating portion of said unitary resilient element with respect to said housing element from a non-penetration position to a penetration position.

23. An automatic needle device according to claim 17 and wherein apertures are formed in cylindrical walls of said cylindrical bore in alignment along a line extending transversely to a longitudinal axis of said housing element.

90. An injection device according to claim 17 and wherein said housing element is an integrally formed element having a generally cylindrical configuration and is generally top-to-bottom and side-to-side symmetric about a longitudinal axis.

91. An injection device according to claim 17 and wherein said housing element includes a rearward generally tubular portion which terminates in an open back and defines forwardly thereof a generally cylindrical portion, whose outer configuration includes top and bottom grip regions.

92. An injection device according to claim 91 and comprising at an inner surface of said generally cylindrical portion forward and rearward inwardly extending transverse ribs and a plurality of inwardly extending longitudinal slots.

93. An injection device according to claim 17 and wherein said housing element is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle held by said needle bearing element.

94. An injection device according to claim 17 and wherein said needle guard has a generally cylindrical configuration and is top-to-bottom and side-to-side symmetric about a longitudinal axis.

95. An injection device according to claim 94 and wherein a rearwardly extending arm is formed at each side of said tubular body, each of said arms including adjacent an extreme rearwardly facing end thereof, an outwardly facing tooth, having an inclined forward surface and a transversely extending rearwardly facing surface.

96. An injection device according to claim 94 and wherein said tubular body defines a generally open back and a forward facing wall portion, defining an injection site engagement surface.

97. An injection device according to claim 17 and wherein said needle guard defines a generally tubular body having formed thereon a plurality of circumferentially spaced, longitudinally extending, outward facing ribs, having rearward facing ends, said outward facing ribs being adapted to slidably locate said needle guard within inwardly extending longitudinal slots of said housing element.

98. An injection device according to claim 97 and wherein extending rearwardly of said outwardly facing ribs there is provided a curved rearward facing portion having a pair of inwardly facing ribs formed therein, and, extending rearwardly of said ribs, there is formed a symmetrically curved rearward facing portion having a pair of ribs formed therein.

99. An injection device according to claim 17 and wherein said needle guard is formed with a pair of side-to-side symmetric windows, to allow viewing of the tip of a needle.

100. An injection device according to claim 17 and wherein, in a pre-use operative orientation suitable for storage, said housing element is joined to said needle bearing element by snap fit engagement of inner facing teeth formed on said needle bearing element into apertures formed in cylindrical walls of said housing element.

101. An injection device according to claim 100 and wherein said at least one resilient element comprises first and second compression springs, said first compression spring being maintained under compression between forward-facing back wall surface of a generally cylindrical portion of said housing element and a rearward facing wall portion of said needle bearing element and said second compression spring being maintained under compression between said forward facing back wall surface and rearward facing ends of said needle guard, which is slidably retained against disassembly forward movement by the positioning of curved rearward facing portions thereof immediately rearward of said inner facing teeth of said needle bearing element

102. An injection device according to claim 100 and wherein said needle bearing element is retained in its place by engagement of rearwardly outwardly facing surfaces of said inner facing teeth with curved rearward facing portions of said needle guard, thus preventing rearwardly extending arms of said needle bearing element from bending outwardly and releasing the snap fit engagement of said inner facing teeth and apertures formed in the cylindrical walls of said cylindrical bore of said housing element.

103. An injection device according to claim 100 and wherein due to engagement of said needle guard with an injection site on a body, said needle guard is forced, against the urging of said at least one resilient element, to move axially in a rearward direction with respect to the remainder of the automatic needle device, thus sliding said curved rearward facing portions thereof further rearward of said outwardly facing teeth of said needle bearing element, thus allowing said arms of said needle bearing element to cantilever outwardly.