Injection with low resistance
A technology for low-resistance syringes and syringes, which is applied to syringes, hypodermic injection devices, infusion sets, etc., and can solve the problem of not being able to automatically adjust the sealing degree of the piston and the barrel wall, reducing friction between the piston and the barrel wall, and effectively reducing the piston and barrel wall. problems such as frictional resistance between
Active Publication Date: 2008-11-26
余利荣
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Another example: Chinese patent 95193831.2 (publication number: CN1152882A, publication date: June 25, 1997) discloses a "low-resistance syringe", the piston rod of which can deform the piston so that the radial wall is drawn from the cylinder The wall is pulled apart to reduce the friction between the piston and the barrel wall, but these syringes cannot automatically adjust the sealing degree between the piston and the barrel wall with the change of the pressure in the barrel, and cannot effectively reduce the frictional resistance between the piston and the barrel wall , can not achieve better results
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[0016] figure 1 Shown is the cross-sectional view of the first embodiment of the present invention, comprising an injection cylinder (1) and a liquid-pushing plunger (2) sliding in the cylinder (1), and the liquid-pushing plunger (2) is driven by a push rod ( 3) and a piston (4), the piston (4) is fixed by the piston fixing device and the push rod (3), the piston (4) is an annular sealing ring (5) made of soft material, the sealing ring ( 5) The longitudinal section is preferably a right-angled trapezoid with a wide top and a narrow bottom (such as Figure 4 shown), the contact surface between the sealing ring of this shape and the inner wall of the cylinder is small, and the frictional resistance between the two is correspondingly small. The end surface of the sealing ring (5) is provided with a The opening groove (6), the longitudinal section of the sealing ring opening groove (6) can be V-shaped like a scissors mouth, or semicircular or U-shaped. In contrast, when the long...
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The invention discloses a low-resistance injector with injector tube and sliding pushing liquid plunger in the tube, which is characterized by the following: designing the plunger a circular sealing ring; setting an open slot around the end-face of sealing ring; fixing the plunger fastening device on the inserting element and under the supporting element of the sealing ring; setting the bottom of inserting element rim to insert in the open slot flange of sealing ring; fixing the sealing ring under the inserting element by supporting element. The injector adapts such sealing ring that it will press to become large or rebound to minimize according to the variation of air pressure in the tube, which changes the interface of the ring and tube. As soon as the pressure varies in the tube, the sealing ring will press or rebound to reach the goal of low-resistance and high sealing by better sensitivity of the injecting plunger.
Description
technical field [0001] The invention relates to a medical syringe, in particular to a low-resistance syringe capable of reducing the frictional resistance between the inner wall of the syringe barrel and the sliding plunger inside. Background technique [0002] Syringe is an indispensable appliance in medical treatment. Known glass syringe has an injection cylinder made of glass. The disadvantage of this glass syringe is that it is easily broken during transportation, causing unusable consequences. If the injection cylinder Use other materials instead. In order to prevent leakage around the piston and obtain a good leak-proof sealing effect, the piston must press against the inner wall of the cylinder. If the inner wall of the cylinder is not smooth enough, the piston will be difficult to move in the cylinder. The operator must use a larger Only a certain force can make the piston move. How to reduce the frictional resistance between the inner wall of the syringe barrel and ...
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IPC IPC(8): A61M5/31A61M5/315
Inventor 余利荣
Owner 余利荣