The thrombosis prevention device of venous detaining needle
Technical field
The present invention relates to the category of medical apparatus and instruments, is a kind of thrombosis prevention device of venous detaining needle.
Background technology
Existing venoclysis needle is easy piercing blood vessel in infusion process, and every day must be changed.The invention of venous detaining needle and application overcome these shortcomings, need nook closing member to extract out during use after completing venipuncture, leave sleeve pipe, so can not injured blood vessel, can stay Ink vessel transfusing continuously with several days.
But existing venous detaining needle, once transfusion suspends, will produce blood back phenomenon, form thrombosis at the end of sleeve pipe and result in blockage.Even if pressurization is washed open, thrombosis also can block blood capillary, produces vasculitis.For addressing these problems, the envelope pin liquid that patent in recent years and product utilization anticoagulant are made or the method by malleation, although alleviate and delay the formation of thrombosis, the thrombosis formed after cannot preventing suspending transfusion completely.One is had to utilize check valve principle to prevent blood back flow preventing thrombosis, although there are some effect complex process performance unreliable being difficult to pile wide application.
Summary of the invention
The object of the present invention is to provide a kind of thrombosis prevention device of venous detaining needle, during time-out transfusion, piston pushes away forward and makes to produce malleation and closed casing in sleeve pipe, more effectively can prevent thrombosis by the method for dual prevention blood backflow.
The object of the present invention is achieved like this: in existing venous detaining needle casing seat, establish a piston and be fixed on the end of ejector sleeve, ejector sleeve is hollow pipe.The nook closing member of remaining needle passes from piston in ejector sleeve, then enters in sleeve pipe.Extract nook closing member when infusing after completing venipuncture by the operating routine of existing remaining needle during operation, piston will extract the position sealing of nook closing member automatically, and when guaranteeing to infuse, medicinal liquid can not spill.When suspending transfusion tube sealing, with ejector sleeve piston pushed away forward medicinal liquid is produced malleation in sleeve pipe while the blasthole of closed casing, make to produce malleation in sleeve pipe and close to reach to stop the effect of blood backflow preventing thrombosis.When need continue to infuse, piston is drawn back, and now the blasthole of sleeve pipe is opened and carries out normal infusion, and this venous detaining needle using method is identical with existing remaining needle, only piston need be pushed away forward during tube sealing.Be that sleeve pipe blasthole is closed prevention blood back again by positive pressure tube sealing during tube sealing, dual prevention blood backflow preventing thrombosis effect is more reliable.
The present invention only need arrange piston in the casing seat of existing venous detaining needle, and piston is fixed on ejector sleeve end, and nook closing member is in ejector sleeve and pass piston, only piston need be pushed away forward during tube sealing, easy to operate, and structure is simple, easily implements.
Accompanying drawing explanation
The concrete structure of invention is drawn by following embodiment and accompanying drawing thereof.
Fig. 1 is the profile of thrombosis prevention device of the venous detaining needle proposed according to the present invention.The profile of the thrombosis prevention device of venous detaining needle when Fig. 2 is tube sealing.
Detailed description of the invention
The details and the working condition that propose concrete device according to the present invention is described in detail below in conjunction with Fig. 1, Fig. 2.
The thrombosis prevention device of venous detaining needle comprises a main casing body seat (1), a closing cock (8) and a piston (2) is had in main body, piston is fixed on the end of ejector sleeve (3), and nook closing member (4) passes from piston (2) in ejector sleeve (3).
To scheme, extract nook closing member (4) during operation after completing venipuncture, sleeve pipe (5) is stayed intravenous and can be infused routinely.Medicinal liquid flows in casing seat (1) from ductule (7), and closing cock (8) stops medicine to flow out backward and can only flow into blood vessel through sleeve pipe (5) forward night.When transfusion time-out carries out tube sealing, shift piston (2) onto the end with ejector sleeve (3) and the blasthole (6) of sleeve pipe (5) is closed.When proceeding transfusion, piston is drawn back, and produces negative pressure in sleeve pipe (5), and the blasthole be closed (6) is opened and can be seen blood back and can infuse.Make to produce malleation in sleeve pipe (5) because piston during tube sealing (2) pushes away forward.Blasthole (6) is closed again and is stoped blood backflow sleeve pipe (5) by piston (2), and have malleation simultaneously and close two kinds of preventing thrombosis measures, effect is more reliable.