Puncture device and puncture needle cartridge
First Claim
1. A puncture device comprising:
- a housing having an opening at its front end, and a plunger which is held in the housing, slidably in forward and backward directions of the housing, said plunger holding a puncture needle detachably; and
a tension spring which urges the plunger in its forward and backward directions;
wherein said plunger is provided with a lever that is rotatable within a predetermined range, around a rotation shaft that is provided on the plunger;
a front end of the tension spring is fixed to a first tension spring fixing chip that is fixed in the housing;
a rear end of the tension spring is latched by a second tension spring fixing part that is provided on the rotatable lever;
said second tension spring fixing part moves backward in conjunction with backward movement of the plunger, and expands the tension spring in an axial direction of the puncture device;
said tension spring urges the plunger toward the front end of the housing via the second tension spring fixing part and the lever, by a restorative force that is caused by the expansion of the tension spring in its axial direction; and
when the plunger moves toward the front end of the housing due to the urging force toward the front end, a fulcrum shaft provided on the housing contacts a peripheral edge portion of the rotatable lever, which is located between the rotation axis and the second tension spring fixing part, and the plunger further moves forward due to its inertial force even after the contact and thereby the fulcrum shaft pushes the rotatable lever backward, whereby the tension spring is again expanded via the rotatable lever and urges the plunger toward the rear end by its restorable force that occurs due to the re-expansion.
5 Assignments
0 Petitions
Accused Products
Abstract
A puncture device is constituted such that a plunger (2) is provided with a lever (3) which is partially restricted in rotation, and a forward urging force is obtained by a contraction restorative force of a tension spring (4), and the tension spring (4) is again expanded with the lever (3) as a leverage when the plunger (2) further moves forward due to its inertia from a position where no urging force is not applied, and the plunger (2) is urged backward by a restorative force of the re-expansion. Further, a puncture needle cartridge is provided with a lancet body (203) having a puncture needle, and a puncture needle holder (201) in which the lancet body (203) is movably stored, and further, the lancet body (203) has an arm means (302) and the puncture needle holder (201) contains a to-be-latched means (303) that cooperates with the arm means (302). Thereby, the fabrication process is simplified, and plural times of punctures of the puncture needle is prevented, and further, the puncture speed is controlled, and moreover, the used puncture needle is discarded safely.
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Citations
11 Claims
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1. A puncture device comprising:
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a housing having an opening at its front end, and a plunger which is held in the housing, slidably in forward and backward directions of the housing, said plunger holding a puncture needle detachably; and a tension spring which urges the plunger in its forward and backward directions; wherein said plunger is provided with a lever that is rotatable within a predetermined range, around a rotation shaft that is provided on the plunger; a front end of the tension spring is fixed to a first tension spring fixing chip that is fixed in the housing; a rear end of the tension spring is latched by a second tension spring fixing part that is provided on the rotatable lever; said second tension spring fixing part moves backward in conjunction with backward movement of the plunger, and expands the tension spring in an axial direction of the puncture device; said tension spring urges the plunger toward the front end of the housing via the second tension spring fixing part and the lever, by a restorative force that is caused by the expansion of the tension spring in its axial direction; and when the plunger moves toward the front end of the housing due to the urging force toward the front end, a fulcrum shaft provided on the housing contacts a peripheral edge portion of the rotatable lever, which is located between the rotation axis and the second tension spring fixing part, and the plunger further moves forward due to its inertial force even after the contact and thereby the fulcrum shaft pushes the rotatable lever backward, whereby the tension spring is again expanded via the rotatable lever and urges the plunger toward the rear end by its restorable force that occurs due to the re-expansion. - View Dependent Claims (2, 3, 4, 10, 11)
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5-9. -9. (canceled)
Specification