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Publication Number
US-11389625-B2
Publication Date
2022-07-19
Expiration Date
Abstract
Provided is a medical needle that reduces a user's discomfort feeling while securely housing a needle tip into a case. Medical needle 1 includes needle portion 10 including needle tip 14 at the head thereof; case 30 configured to be capable of exposing needle portion 10 from the head thereof and housing the needle portion; movement mechanism 50 including spring member 60, which is located in case 30, configured to move needle portion 10 from a first position at which needle tip 14 protrudes from case 30 by a predetermined length to a second position at which needle tip 14 is housed in case 30; and curved portion 90 provided in a portion which is in movement mechanism 50 and faces case 30.
Core Innovation
The invention relates to a medical needle in which a needle portion is exposed from a head of a case in a first position and is housed in the case in a second position. A movement mechanism includes an elastic member that moves the needle portion from the first position to the second position, with the elastic member located in the case.
A curved portion is provided on the movement mechanism so as to face an inner surface of the case in a longitudinal direction of the case. To address user discomfort and collision noise arising from impact between the movement mechanism including the elastic member and the case during retraction, at least one facing surface includes a curved buffer portion that flexes upon contact with the case and attenuates the impact.
The movement mechanism includes a control portion and a fixing portion for fixing the control portion to the needle portion, and the case includes a first engagement portion and a second engagement portion that respectively engage the control portion when the needle portion is positioned at the first position and the second position. When the needle portion is moved to the second position by the elastic member and the curved portion contacts the case, a position of a protrusion of the control portion changes toward the second engagement portion and the protrusion engages the second engagement portion with a main surface of the curved portion in surface contact with the inner surface of the case.
Claims Coverage
The provided material includes two independent claims. Each independent claim centers on a medical needle with a case, an elastic-member movement mechanism that retracts a needle tip between a first exposed position and a second housed position, and a curved or curving plate feature that cooperates with the case inner surface and engagement portions at the second position.
Case with exposed first position and housed second position
A case configured to expose the needle portion from a head of the case and house the needle portion.
Elastic-member movement mechanism for retraction between first and second positions
A movement mechanism including an elastic member that moves the needle portion from a first position at which the needle tip protrudes from the case by a predetermined length to a second position at which the needle tip is housed in the case, the elastic member being located in the case.
Curved portion facing inner surface in longitudinal direction
A curved portion provided on the movement mechanism so as to face an inner surface of the case in a longitudinal direction of the case.
Control portion and engagement portions for first and second positions
The movement mechanism includes a control portion and a fixing portion for fixing the control portion to the needle portion, and the case includes a first engagement portion for engagement with the control portion when the needle portion is positioned at the first position and a second engagement portion for engagement with the control portion when the needle portion is positioned at the second position.
Curving plate shape with engagement and surface contact at the second position
The control portion has an operation end and a connection portion connected to the fixing portion, the operation end has a plate shape extending along the longitudinal direction of the case, a protrusion engageable with the first engagement portion or the second engagement portion is provided at the first end, and the curved portion has a curving plate shape protruding in the longitudinal direction of the case from the second end and hanging down in an opposite direction of the protruding direction of the protrusion, with a main surface flush with the operation end and facing the inner surface of the case.
Across the independent claims, the medical needle relies on an elastic-member mechanism housed in a case to retract a needle tip from a first exposed position to a second housed position, while a curved or curving plate portion facing the case inner surface cooperates with control portion engagement features to establish engagement with a second engagement portion and surface contact when the curved portion contacts the case.
Stated Advantages
Reduces user discomfort and collision noise caused by impact between the movement mechanism or needle portion and the case.
Attenuates the impact by flexing the curved buffer portion upon contact with the case.
Documented Applications
No documented applications found
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