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Publication Number
US-8172803-B2
Publication Date
2012-05-08
Expiration Date
Abstract
A cannula insertion device comprises an elongate frame (4) and a hub (5) mounted to the frame and arranged to be slidably moveable from a first position forwards along a longitudinal axis to a second position relative to the frame and a needle (11) projecting forwards from the hub and carrying a detachable cannula (2) assembly including a cannula. The frame and hub are arranged to allow the hub to be moved forwards from the first position to the second position so as to insert the cannula into a patient and to be drawn backwards to a withdrawn position. The needle is shielded by the frame when the hub is in the first position and also when in the withdrawn position.
Core Innovation
The invention relates to a cannula insertion device comprising a frame and a hub mounted to the frame. The hub is arranged to be slidably moveable from a first position to a second position, and a needle projecting from the hub is shielded by the frame when the hub is in the first position. The device carries a detachable cannula assembly including a cannula, and the frame and hub are arranged so the hub moves to insert the cannula into a patient and moves in a reverse direction to a third position in which the frame shields the needle.
The apparatus further includes a housing for receiving the detachable cannula assembly, and the cannula insertion device is removeably attached to the housing. Detachment from the housing occurs only once the hub is in the third position, when the frame shields the needle. The frame includes first and second arms running along opposite sides of a central portion of the frame and attached by respective deformable hinges, with anterior distal ends arranged to provide jaws for releasably attaching the cannula insertion device to the housing.
In addition, the hub has opposing surfaces for gripping between a finger and thumb of one hand, the opposing surfaces lying outside the arms of the frame. At least a portion of the hub is deformable so that, when pressed together, the opposing surfaces move inwards. The partial content also describes a latching and locking mechanism to prevent forward movement of the slider in the shielding position, and a deformable arm and frame geometry that enables release of the insertion device from the septum housing only when the needle is safely withdrawn.
Claims Coverage
The document provides two independent claims: one apparatus claim and one method claim. Across both, the coverage centers on a slidably movable hub and needle that are shielded by the frame in a third withdrawn position, plus a removable attachment to a housing that is only released after reaching that shielding position, with a deformable arm-jaw structure and hand-grippable deformable hub surfaces.
Shielded needle via slidably movable hub between first, second and third positions
A frame and a hub mounted to the frame, the hub arranged to be slidably moveable from a first position to a second position relative to the frame; a needle projecting from the hub, the needle being shielded by the frame when the hub is in the first position; and the frame and hub arranged to allow the hub to be moved from the first position to the second position so as to insert the cannula into a patient and to be moved in a second, reverse direction backwards to a third position in which the frame shields the needle.
Detachable cannula assembly carried by the needle
A detachable cannula assembly including a cannula, the needle carrying the detachable cannula assembly.
Removeable attachment to housing and detachment only once hub is in third shielding position
A housing for receiving the detachable cannula assembly, wherein the cannula insertion device is removeably attached to the housing and is detachable from the housing only once the hub is in the third position.
Deformable hinged frame arms with jaw features for releasably attaching to housing
The frame includes first and second arms running along opposite sides of a central portion of the frame and attached thereto by respective deformable hinges, each arm having an anterior distal end and a posterior distal end relative to the hinge of the arm, the anterior distal ends of the arms arranged to provide jaws for releasably attaching the cannula insertion device to the housing for receiving the detachable cannula assembly.
Hand gripping of deformable hub opposing surfaces outside the arms
The hub has opposing surfaces for gripping between a finger and thumb of one hand and which lie outside the arms of the frame, at least a portion of the hub being deformable so as to allow the opposing surfaces to be moved inwards when pressed together.
Method steps aligned to shielding and housing detachment
Gripping the opposing surfaces of the hub between a finger and thumb of one hand; moving the hub in the first direction from the first position to the second position so as to insert the cannula into a patient; drawing the hub in a second, reverse direction to the third position in which the frame shields the needle; and detaching the cannula insertion device from the housing when the hub is in the third position.
Overall, the claims cover an apparatus and a corresponding method in which a detachable cannula assembly is carried by a needle that is shielded by the frame when the hub reaches a third position, with removable attachment and release relative to a housing constrained to that shielding position. The frame-jaw structure is based on first and second arms attached by deformable hinges, and the hub includes deformable opposing gripping surfaces configured for finger-and-thumb compression.
Stated Advantages
The frame shields the needle when the hub is in the third position.
Detachment of the cannula insertion device from the housing occurs only once the hub is in the third position.
A deformable arm geometry provides jaws for releasably attaching the cannula insertion device to the housing.
Documented Applications
Using a cannula insertion device to insert the cannula into a patient and to manage needle shielding via hub movement between first, second, and third positions.
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