Cylindrical pushrod for needle-retracting safety injector and the needle-retraction controllable safety injector
First Claim
1. A cylindrical pushrod for the syringe needle-retracting safety injector, wherein the cylindrical pushrod comprises an outer cylinder (1), an inner cylinder (2), a push pole (3) and an underpinned piece (4);
- the head of outer cylinder (1) is provided with a sealing gasket (5);
the push pole (3) is set at the front end of chamber of outer cylinder (1), the front end of push pole (3) closes the frontend opening of outer cylinder (1) and outstands outside of the seal gasket (5), and appears as a tubular shape or projects partially in longitudinal direction, and the back end of said push pole (3) is supported on the underpinned piece (4);
the underpinned piece (4) has a through hole (401) for allowing the push pole (3) to pass through and a underpinned patch (402) for opening or closing the through hole (401), and the underpinned patch (402) is set at the front end of the chamber of outer cylinder (1) and supports the push pole (3);
the inner cylinder (2) is set inside the outer cylinder (1) with its front end openend and its back end closed, and the top end surface of its cylinder wall supports the underpinned piece (4) or the underpinned patch (402) thereof to close the through hole (401);
the tail of cylindrical pushrod is provided with a clamping structure for clamping the inner cylinder and the outer cylinder in a releasable manner, the clamping structure, after it is released, may make the inner cylinder (2) slide backward to a distance for allowing the push pole (3) pass through after opening the through hole 401 under the action of retractive force of the needle, and is clamped within the outer cylinder 1 again cylinder wall
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Abstract
The invention provide a cylindrical pushrod for the syringe needle-retracting safety injector, comprising an outer cylinder (1), an inner cylinder (2), a push pole (3), an underpinned piece (4) and a seal gasket (5); the push pole (3) is set at the front end of chamber of outer cylinder (1), its front end appears as a tubular shape or projects partially in the longitudinal direction, the back end of push pole (3) is supported on the underpinned piece (4); the underpinned piece (4) is set at the front end of the chamber of outer cylinder (1) and supports the push pole (3); the cylinder wall of the inner cylinder (2) supports the underpinned piece (4); a clamping structure is set at the tail of this cylindrical pushrod. With the safety injector with the cylindrical pushrod according to the invention, the medical personnel can control the time of the needle retraction as desired, and is not necessary to change their habitual injection practice, and thereby the safety injector is easy to operate. The invention also provide a safety injector, which can not only carry out the controllable retraction of the needle but also has a simple and crafty fixed structure of the needle stand to achieve the effect of reliable fixation as well as releasing with ease.
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Citations
20 Claims
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1. A cylindrical pushrod for the syringe needle-retracting safety injector, wherein the cylindrical pushrod comprises an outer cylinder (1), an inner cylinder (2), a push pole (3) and an underpinned piece (4);
- the head of outer cylinder (1) is provided with a sealing gasket (5);
the push pole (3) is set at the front end of chamber of outer cylinder (1), the front end of push pole (3) closes the frontend opening of outer cylinder (1) and outstands outside of the seal gasket (5), and appears as a tubular shape or projects partially in longitudinal direction, and the back end of said push pole (3) is supported on the underpinned piece (4);
the underpinned piece (4) has a through hole (401) for allowing the push pole (3) to pass through and a underpinned patch (402) for opening or closing the through hole (401), and the underpinned patch (402) is set at the front end of the chamber of outer cylinder (1) and supports the push pole (3);
the inner cylinder (2) is set inside the outer cylinder (1) with its front end openend and its back end closed, and the top end surface of its cylinder wall supports the underpinned piece (4) or the underpinned patch (402) thereof to close the through hole (401);
the tail of cylindrical pushrod is provided with a clamping structure for clamping the inner cylinder and the outer cylinder in a releasable manner, the clamping structure, after it is released, may make the inner cylinder (2) slide backward to a distance for allowing the push pole (3) pass through after opening the through hole 401 under the action of retractive force of the needle, and is clamped within the outer cylinder 1 again cylinder wall - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- the head of outer cylinder (1) is provided with a sealing gasket (5);
Specification