CN103170034A

CN103170034A - Prefilled type wash pipe syringe

Info

Publication number: CN103170034A
Application number: CN2013101145766A
Authority: CN
Inventors: 马才; 宋修山; 徐千贺; 于飞飞; 张娥
Original assignee: Shandong Weigao Group Medical Polymer Co Ltd
Current assignee: Shandong Weigao Group Medical Polymer Co Ltd
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2013-06-26

Abstract

The invention relates to a prefilled type wash pipe syringe which comprises a sleeve, a piston and a push rod, wherein the piston is connected with a threaded joint arranged on the push rod through inner piston threads, and a piston contraction cavity is formed between the top of the threaded joint and the top of the piston, wherein the piston contraction cavity can sufficiently accommodate the top of the piston when the top of the piston contracts. The arrangement of the piston contraction cavity enables different types of deformation to be produced when overlarge or micro pipe flushing impact force is exerted at the top of the piston and enables an operator to be guided, and therefore the occurrence of the situation of pipe flushing blast or incomplete flushing is avoided.

Description

A kind of pre-filled flushing syringe

Technical field

The present invention relates to a kind of syringe, relate in particular to a kind of pre-filled flushing syringe that uses when irrigating catheter.

Background technology

Venous duct is a kind of therapy equipment commonly used, arranging of venous duct can conveniently be treated, for example can medicine be input in human body by venous duct, and these conduits need to rinse in order to keep catheter patency and complete, the fluid of irrigating catheter is housed in pre-filled flushing syringe, as pump pickle solution, heparin etc.

The piston bush that connects push rod is contained in sleeve inner, and with the liquid containing chamber of the pre-filled flushing syringe of sleeve lining formation, the piston that uses at present is solid construction, and the piston of this structure is poor to the pressure sensitive of transmitting via push rod.In use, due to operator's difference, the washing pipe dynamics that applies is also different, and this can cause washing pipe pressure uncontrollable.Pressure is excessive, has the risk that bursts conduit; Pressure is too small, and medicinal liquid or blood rinse not exclusively, so can affect the patency of conduit for a long time.

Summary of the invention

The object of the invention is to overcome above-mentioned shortcoming, a kind of pre-filled flushing syringe that provides rinses venous duct safely, effectively.

Technical scheme of the present invention is: a kind of pre-filled flushing syringe, comprise sleeve, piston and push rod, piston links together by the piston thread of inside and the nipple on push rod, has between described nipple top and top land to be large enough to hold top land and to shrink required piston retraction chamber.

Described push rod nipple has one to produce the container cavity of distortion because of pressure for taking in piston, and the screw thread on nipple is zigzag, and the angle of sawtooth and push rod is 30-45 °.

The outside of the bottom of described piston is provided with the 3rd sealing ring, be provided with piston lower support ring on the 3rd sealing ring, be provided with the second sealing ring on piston lower support ring, be provided with piston upper support ring on the second sealing ring, be provided with the first sealing ring on piston upper support ring, be provided with top land on the first sealing ring.Piston is the circular arc link between all the other each parts except piston thread, top land and piston upper support ring are thin-wall construction.

The invention has the beneficial effects as follows, have between nipple top and top land and be large enough to hold top land and shrink required piston retraction chamber, top land can be when being subject to excessive or too small washing pipe power, produce different deformation, the operator is played directive function, occur thereby avoid bursting conduit or rinse inadequate situation.

Description of drawings

Fig. 1 is main cutaway view of the present invention;

Fig. 2 is the piston full sectional view of invention;

Fig. 3 is push rod full sectional view of the present invention;

In figure, each label declaration is as follows:

1, push rod, 2, push-rod handle, 3, ejector pin retaining plate, 4, nipple, 5, container cavity, 6, piston, 7, piston thread, 8, top land, 9, piston upper support ring, 10, the piston retraction chamber, 11, the first sealing ring, 12, the second sealing ring, 13, piston lower support ring, the 14, the 3rd sealing ring.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.

As shown in Figure 1-Figure 3, push rod 1, push-rod handle 2, ejector pin retaining plate 3 and nipple 4 are all selected polypropylene material time processing molding in mould.Be processed with the push rod gusset below push rod, be processed with push-rod handle below the push rod gusset, be processed with ejector pin retaining plate on push rod, be processed with nipple on ejector pin retaining plate, described nipple has one to produce the container cavity 5 of distortion because of pressure for taking in piston.The effect of ejector pin retaining plate 3 is retaining thread joints 4, and the effect of nipple 4 is fixed pistons 6.Piston 6 selects the top-quality rubber material manufacture to form, and except piston thread 7, other all parts of piston all adopts the circular arc link.

Top land 8 and piston upper support ring 9 are thin-walled design and its front end inner piston retraction chamber 10 that forms, and piston retraction chamber 10 can hold the contraction of top land 8.When carrying out the washing pipe operation at applied thrust, if thrust is excessive, top land 8 can be subject to the counteracting force of liquid in syringe, top land 8 is reversed and is compressed in

piston retraction chamber

10, and 10 inner spaces, piston retraction chamber enough do not hold top land 8 fully, and the material that can not hold is squeezed between the first sealing ring 11 and sleeve lining, increase the contact area of the first sealing ring 11 and sleeve lining, increase the coefficient of kinetic friction, thereby consume too much thrust, prevent booster.

Piston 6 is connected with nipple 4 by piston thread 7, and screw thread is zigzag, and the angle of sawtooth and push rod is 30-45 °, so just can guarantee that nipple 4 more is affixed to sleeve at stressed rear extrusion piston 6.If continuing after piston tip 8 is reversed compression increases external force again, top land 8 is further compressed.After piston 6 is subject to nipple 4 effects, the second sealing ring 12, piston lower support ring 13 and the 3rd sealing ring 14 are affixed to sleeve lining, increase with the sleeve lining contact area, the coefficient of kinetic friction also increases, and can consume more thrust, the liquid that makes washing pipe reduces the pressure of venous duct, avoid the generation of booster situation, and operator can be by observing the distortion of top land 8, applied thrust is excessive as can be known, should suitably reduce thrust, play forewarning function.Simultaneously, if the thrust that applies during washing pipe is too small, the drag effect that top land 8 is subject to liquid is also little, and top land 8 can not produce any distortion, illustrates that the thrust that applies is too small, venous duct may not be washed down, and should suitably increase thrust.Therefore, can make top land 8 be undulatory motion when applying desirable washing pipe thrust, during operator's irrigating catheter, as long as note observing top land 8 situations, just washing pipe power can be controlled in best scope.

Same, these designs of top land 8 can also be played the whether unimpeded effect of detected catheter.Before carrying out the washing pipe operation, promote push-rod handle 2, and then piston 6 is pushed, observe whether inwardly rollback of top land 8, if generation rollback, the occlusion catheter such as blood clotting is arranged in venous duct are described, should stop immediately the washing pipe operation, can again carry out washing pipe after the employing adequate measure is got rid of clot.

In sum, the present invention is because top land 8 and piston upper support ring 9 are thin-walled design and its front end inner piston retraction chamber 10 that forms, and the nipple on push rod 14 has one to produce the container cavity 5 of distortion because of pressure for taking in piston, therefore piston 6 can be when being subject to excessive or too small washing pipe power, produce different deformation, the operator is played directive function.

Claims

1. pre-filled flushing syringe, comprise sleeve, piston and push rod, piston links together by the piston thread of inside and the nipple on push rod, it is characterized in that, has between described nipple top and top land to be large enough to hold top land and to shrink required piston retraction chamber.

2. pre-filled flushing syringe according to claim 1, it is characterized in that, the outside of the bottom of piston is provided with the 3rd sealing ring, be provided with piston lower support ring on the 3rd sealing ring, be provided with the second sealing ring on piston lower support ring, be provided with piston upper support ring on the second sealing ring, be provided with the first sealing ring on piston upper support ring, be provided with top land on the first sealing ring, top land and piston upper support ring are thin-wall construction.

3. pre-filled flushing syringe according to claim 1, is characterized in that, described push rod nipple has one to produce the container cavity of distortion because of pressure for taking in piston.

4. pre-filled flushing syringe according to claim 1, is characterized in that, the screw thread on piston thread and nipple is zigzag.

5. pre-filled flushing syringe according to claim 4, the sawtooth on nipple and the angle of push rod are 30-45 °.