CN203227096U

CN203227096U - Prefilled flushing syringe

Info

Publication number: CN203227096U
Application number: CN 201320163259
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: 2013-10-09
Anticipated expiration: 2023-04-03

Abstract

The utility model relates to a prefilled flushing syringe. The prefilled flushing syringe comprises a sleeve, a piston and a push rod; the piston is connected with a screwed joint which is arranged on the push rod through internal piston threads; a piston contraction chamber which is large enough to accommodate contraction of the top of the piston is formed between the top of the screwed joint and the top of the piston. According to the prefilled flushing syringe, the piston contraction chamber enables different deformation to be produced when the top of the piston is under too large or too small flushing force to play a guiding role for operators and accordingly the condition that a catheter is burst or the flushing is insufficient is avoided.

Description

A kind of pre-filled washing pipe syringe

Technical field

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

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 the human body by venous duct, and these conduits need wash in order to keep catheter patency and complete, the fluid of irrigating catheter is housed in the pre-filled washing pipe syringe, as pump pickle solution, heparin etc.

The piston bush that connects push rod is contained in sleeve inner, constitutes the liquid containing chamber of pre-filled washing pipe syringe with sleeve lining, and the piston that uses is solid construction at present, and the piston of this structure is poor to the pressure sensitive of transmitting via push rod.In use, because 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 towards quick-fried conduit; Pressure is too small, and medicinal liquid or blood flushing not exclusively so can influence for a long time the unobstructed property of conduit.

Summary of the invention

The objective of the invention is to overcome above-mentioned shortcoming, a kind of pre-filled washing pipe syringe that provides washes venous duct safely, effectively.

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

Described push rod nipple has one to be used for taking in piston and to produce the container cavity of distortion because of pressure, and the screw thread on the 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, on the 3rd sealing ring, be provided with piston lower support ring, on piston lower support ring, be provided with second sealing ring, on second sealing ring, be provided with piston upper support ring, on piston upper support ring, be provided with first sealing ring, on first sealing ring, be provided with top land.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 the top land and be large enough to hold the required piston retraction chamber of top land contraction, top land can be when being subjected to excessive or too small washing pipe power, produce different deformation, the operator is played directive function, thereby avoid towards quick-fried conduit or wash inadequate situation taking place.

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;

Each label declaration is as follows among the figure:

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, first sealing ring, 12, 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 for use.Below push rod, be processed with the push rod gusset, below the push rod gusset, be processed with push-rod handle, be processed with ejector pin retaining plate on push rod, be processed with nipple on ejector pin retaining plate, described nipple has one to be used for taking in piston produces distortion because of pressure container cavity 5.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 for use the top-quality rubber material manufacture to form, and except piston thread 7, other each parts of piston all adopt the circular arc link.

Top land 8 and piston upper support ring 9 are the inner piston retraction chamber 10 that forms of thin-walled design and its front end, 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 subjected to the counteracting force of liquid in the syringe, top land 8 is reversed and is compressed in the

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 first sealing ring 11 and the sleeve lining, increase the contact area of 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 extrusion piston 6 afterwards.If continuing after piston tip 8 is reversed compression increases external force again, top land 8 is further compressed.After piston 6 is subjected to nipple 4 effects, 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, make the liquid of washing pipe reduce 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 subjected 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, when applying desirable washing pipe thrust, can make top land 8 be the motion of fluctuation formula, during operator's irrigating catheter, as long as note observing top land 8 situations, just can be with the control of washing pipe power in the scope of the best.

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, occlusion catheter such as blood clotting is arranged in the venous duct are described, should stop the washing pipe operation immediately, can carry out washing pipe again 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 the inner formation of its front end piston retraction chamber 10, and the nipple on the push rod 14 has one to be used for taking in piston produces distortion because of pressure container cavity 5, therefore piston 6 can be when being subjected to excessive or too small washing pipe power, produce different deformation, the operator is played directive function.

Claims

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

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

3. pre-filled washing pipe syringe according to claim 1 is characterized in that, described push rod nipple has one to be used for taking in piston produces distortion because of pressure container cavity.

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

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