Puncture instrument
First Claim
1. A puncture instrument comprising:
- a case;
a needle assembly movably disposed in the case and including a needle and a hub holding the needle;
a hub passage for axially guiding the hub, the hub passage being disposed in the case;
a needle passage disposed in the case and communicating with the hub passage, the needle passage having a distal end opening for allowing a tip end of the needle to project therethrough;
at least one arm having a first junction on an end thereof connected to the hub and a second junction on another end thereof, the arm being inclined from the first junction toward a proximal end of the case in an initial state;
a push rod joined to the second junction and extending toward the proximal end;
a pusher for pushing the push rod toward a distal end of the case; and
a fulcrum member separate from the arm in the initial state and abutting against a portion of the arm when the arm moves;
wherein when the push rod is pushed toward the distal end by the pusher, the arm pushes the needle assembly toward the distal end, brings the portion thereof into abutment with the fulcrum member, and turns about the fulcrum member, so that the arm is inclined from the first junction toward the distal end thereby to pull back the needle assembly toward the proximal end.
1 Assignment
0 Petitions
Accused Products
Abstract
A puncture instrument includes a needle assembly, a hub passage for axially guiding a hub, a needle passage communicating with the hub passage and having a distal end opening for allowing the tip end of a needle to project instantaneously therethrough, two arms having first junctions connected to the hub and inclined rearward in a direction away from the hub in an initial state, two push rods connected to second junctions of the arms and extending rearward, a button for pushing the push rods forwardly, and fulcrum members disposed more closely to the distal end than the arms for abutment against portions of the arms when the arms are moved. When the push rods are pushed forwardly by the button, the arms push the needle assembly forwardly, thereafter have portions thereof brought into abutment against the fulcrum members, and turn to pull the needle assembly rearward.
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Citations
20 Claims
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1. A puncture instrument comprising:
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a case; a needle assembly movably disposed in the case and including a needle and a hub holding the needle; a hub passage for axially guiding the hub, the hub passage being disposed in the case; a needle passage disposed in the case and communicating with the hub passage, the needle passage having a distal end opening for allowing a tip end of the needle to project therethrough; at least one arm having a first junction on an end thereof connected to the hub and a second junction on another end thereof, the arm being inclined from the first junction toward a proximal end of the case in an initial state; a push rod joined to the second junction and extending toward the proximal end; a pusher for pushing the push rod toward a distal end of the case; and a fulcrum member separate from the arm in the initial state and abutting against a portion of the arm when the arm moves; wherein when the push rod is pushed toward the distal end by the pusher, the arm pushes the needle assembly toward the distal end, brings the portion thereof into abutment with the fulcrum member, and turns about the fulcrum member, so that the arm is inclined from the first junction toward the distal end thereby to pull back the needle assembly toward the proximal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A puncture instrument comprising:
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a case; a needle assembly movably disposed in the case and including a needle and a hub holding the needle; a hub passage for axially guiding the hub, the hub passage being disposed in the case; a needle passage disposed in the case and communicating with the hub passage, the needle passage having a distal end opening for allowing a tip end of the needle to project therethrough; at least one arm having a first junction on an end thereof connected to the hub and a second junction on another end thereof, the arm being inclined from the first junction toward a proximal end of the case in an initial state; a push rod joined to the second junction and extending toward the proximal end; a pusher for pushing the push rod toward a distal end of the case; and a fulcrum member positioned distally of the first junction in the initial state and abutting against a portion of the arm when the arm moves; wherein when the push rod is pushed toward the distal end by the pusher, the arm pushes the needle assembly toward the distal end, brings the portion thereof into abutment with the fulcrum member, and turns about the fulcrum member, so that the arm is inclined from the first junction toward the distal end thereby to pull back the needle assembly toward the proximal end. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A puncture instrument comprising:
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a case; a needle assembly movably disposed in the case and including a needle and a hub holding the needle; a hub passage for axially guiding the hub, the hub passage being disposed in the case; a needle passage disposed in the case and communicating with the hub passage, the needle passage having a distal end opening for allowing a tip end of the needle to project therethrough; at least one arm connected to the hub at a first junction located at one end of the at least one arm, the at least one arm also including a second junction on an opposite end of the at least one arm, the arm being inclined from the first junction toward a proximal end of the case in an initial state so that the first junction is positioned distally of the second junction; a push rod joined to the second junction and extending toward the proximal end; a pusher for pushing the push rod toward a distal end of the case; a fulcrum member for abutting against a portion of the arm when the arm moves; and the push rod being movable toward the distal end by the pusher to cause the arm to push the needle assembly toward the distal end, to bring the portion of the arm into abutment with the fulcrum member and turn the arm about the fulcrum member so the arm is inclined from the first junction toward the distal end such that the second junction is positioned distally of the first junction to thereby pull back the needle assembly toward the proximal end.
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Specification