Retractable safety penetrating instrument
First Claim
1. A retractable safety penetrating instrument for introduction into a cavity in the body comprisinga cannula having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends;
- a tubular needle slidably disposed in said cannula lumen and having a sharp distal tip for penetrating a wall of the cavity;
retracting means for moving said sharp distal tip proximally from an extended position where said sharp distal tip protrudes beyond said cannula distal end to a retracted position where said sharp distal tip is withdrawn into said cannula to prevent contact of said sharp distal tip with tissue; and
trigger means including an operating member movable distally when said sharp distal tip has penetrated into said cavity and a trigger member for being engaged by said operating member when said operating member moves distally for automatically actuating said retracting means to move said sharp distal tip to said retracted position.
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Accused Products
Abstract
A retractable safety penetrating instrument includes a cannula and a needle disposed within the cannula and supported in a manner to automatically move proximally from an extended position wherein a sharp distal end of the needle protrudes from the cannula to a retracted position wherein the sharp distal end of the needle is protected in response to distal movement of the retractable safety penetrating instrument upon penetration into a cavity in the body. A retracting mechanism moves the needle proximally, is normally locked in a position preventing proximal movement of the needle and is released by distal movement of an operating member to trigger retraction of the needle.
122 Citations
42 Claims
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1. A retractable safety penetrating instrument for introduction into a cavity in the body comprising
a cannula having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends; -
a tubular needle slidably disposed in said cannula lumen and having a sharp distal tip for penetrating a wall of the cavity; retracting means for moving said sharp distal tip proximally from an extended position where said sharp distal tip protrudes beyond said cannula distal end to a retracted position where said sharp distal tip is withdrawn into said cannula to prevent contact of said sharp distal tip with tissue; and trigger means including an operating member movable distally when said sharp distal tip has penetrated into said cavity and a trigger member for being engaged by said operating member when said operating member moves distally for automatically actuating said retracting means to move said sharp distal tip to said retracted position. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A retractable safety penetrating instrument for introduction into a cavity in the body comprising
a cannula having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends; -
a tubular needle slidably disposed in said cannula lumen and having a sharp distal tip for penetrating a wall of the cavity; retracting means for moving said needle proximally from an extended position where said sharp distal tip protrudes beyond said cannula distal end to a retracted position where said sharp distal tip is withdrawn into said cannula to prevent contact of said sharp distal tip with tissue, said retracting means including means for biasing said needle proximally; locking means engageable with said retracting means for preventing movement of said retracting means proximally, said locking means including a latch biased into engagement with said retracting means; and trigger means including an operating member movable distally when said sharp tip has penetrated into said cavity for automatically actuating said retracting means to move said needle to said retracted position, said trigger means including releasing means for being engaged by said operating member when said operating member moves distally for disengaging said locking means from said retracting means. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A retractable safety penetrating instrument for introduction into a tubular vessel in the body comprising
a cannula having a distal end for positioning in the tubular vessel, a proximal end for positioning externally of the tubular vessel and a lumen extending between said distal and proximal ends; -
a tubular needle disposed in said lumen of said cannula and having a sharp distal end for penetrating the wall of the tubular vessel; retracting means for moving said sharp distal end proximally relative to the cannula from an extended position where said sharp distal end protrudes beyond said cannula distal end to a retracted position where said sharp distal end is disposed within said cannula distal end; and trigger means for automatically actuating said retracting means to move said sharp distal end to said retracted position in response to movement of said needle distally upon said cannula distal end entering the tubular vessel whereby said sharp distal end of said needle is protected from inadvertent contact with tissue in the tubular vessel. - View Dependent Claims (17, 18)
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19. A retractable safety penetrating instrument for introduction into a tubular vessel in the body comprising
a cannula having a distal end for positioning in the tubular vessel, a proximal end for positioning externally of the tubular vessel and a lumen extending between said distal and proximal ends; -
a tubular needle disposed in said lumen of said cannula and having a sharp distal end for penetrating the wall of the tubular vessel and a hollow proximal end; retracting means for moving the needle proximally relative to the cannula from an extended position where said sharp distal end protrudes beyond said cannula distal end to a retracted position where said sharp distal end is disposed within said cannula distal end, said retracting means including means for biasing said needle in a proximal direction; means engageable with said retracting means for preventing movement of said needle in the proximal direction; trigger means for automatically actuating said retracting means to move said needle to said retracted position in response to movement of said retractable safety penetrating instrument distally upon said cannula distal end entering the tubular vessel whereby said sharp distal end of said needle is protected from inadvertent contact with tissue in the tubular vessel, said trigger means including means for automatically disengaging said movement preventing means; and housing means for mounting said proximal end of said needle and cylindrical member means secured to said housing means and extending into said needle proximal end for guiding proximal movement of said needle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A retractable safety penetrating instrument for providing fluid communication with a cavity in the body comprising
a cannula for providing a passage through a cavity wall and having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends; -
a tubular needle having a sharp distal end for penetrating the cavity wall; and means for mounting the needle in said lumen of said cannula for allowing proximal movement of said needle relative to said cannula during penetration of the cavity wall, said means for mounting including means for biasing said needle in a distal direction to allow proximal movement of said needle against the distal bias in response to a proximal force from tissue contact at said distal end of said needle during penetration of the cavity wall. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A retractable safety penetrating instrument for introduction into a cavity in the body comprising
a cannula having a distal end for positioning in the body cavity, a proximal end for positioning externally of the body cavity and a lumen extending between said distal and proximal ends; -
a tubular needle disposed in said lumen of said cannula having a sharp distal end for penetrating the cavity wall; means for biasing said needle distally within said lumen of said cannula to an extended position where said sharp distal end protrudes beyond said cannula distal end; retracting means for moving said needle proximally relative to said cannula from said extended position to a retracted position to prevent contact of said sharp distal end with tissue; and trigger means for automatically actuating said retracting means to move said needle to said retracted position in response to movement of said needle distally within said lumen of said cannula. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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Specification