CN200973886Y

CN200973886Y - Syringe

Info

Publication number: CN200973886Y
Application number: CN 200620160676
Authority: CN
Inventors: 骆忠林; 梁启明; 莫敏芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-20
Filing date: 2006-11-20
Publication date: 2007-11-14
Anticipated expiration: 2016-11-20

Abstract

The utility model relates to an injector. A plurality of chock blocks are arranged on the hole wall of the same height at the middle of inner walls of a central line of a needle head base. The chock blocks are of each thickness and provided with an upper horizontal straight side and a lower vertical inclined side. And a plurality of cams are arranged on the external wall surface of the same height at the middle of a round rod of a piston. The cams are of the even thickness and provided with a lower horizontal straight side and an upper vertical inclined side. The lower vertical inclined side and the upper horizontal straight side are matching with the upper vertical inclined side and lower horizontal straight side respectively. The utility model can prevent medical personnel from being injured in the using process accidentally and used needles from being used again. With simple structure and low cost, the utility model can be used as a disposable injector.

Description

A kind of syringe

Technical field

This utility model relates to a kind of syringe, relates to prevent the syringe of accidental puncture more specifically.

Background technology

Syringe is a kind of medical treatment apparatus commonly used.Because injection needle is very sharp, medical personnel in use may be by accidental puncture, if the used syringe needle of patient more can cause the propagation once more of virus.For a long time, be subjected to acupuncture to be considered to medical and nursing work person's potential danger always.At present, the propagation of stabbing caused serious and potential fatal infection by this class has caused that people pay close attention to greatly.

At accidental needle sticks, the patent disclosure of this respect is early arranged both at home and abroad.On November 9th, 2005, disclosed Chinese patent application 03825053.5 disclosed a kind of syringe with retractable needle parts.The syringe of this application comprises that a needle tubing, is installed in the piston in the needle tubing, there is a hole to be used to hold an axle in the piston, the end that axle is stretched out the lower end of piston has the device that cooperates with syringe needle, axle cooperated with the top of syringe needle when injection finished, when transfering to piston, syringe needle is brought in the needle tubing together, hurted sb.'s feelings with regard to having avoided being exposed to the outer syringe needle of needle tubing like this.This syringe, dependable performance, but complex structure, cost height.

The utility model content

This utility model has the syringe construction complexity of retractable needle parts for solving to have now, and the problem that cost is high provides a kind of simple in structure, the syringe of the retractable needles that cost is low.

For addressing the above problem, syringe of the present utility model, comprise a piston, one syringe, one needle holder and one has the holder of syringe needle, it is characterized in that, be evenly equipped with a plurality of blocks on the hole wall surface of the inwall middle part sustained height scope of the centre bore of needle holder, block thickness is even, have a horizontal straight flange and a following hypotenuse at vertical direction on crossing, be evenly equipped with a plurality of projections on the outer wall surface of the middle part sustained height scope of the round bar of piston, projection thickness is even, have crossing horizontal straight flange and a hypotenuse on vertical direction once, following hypotenuse can cooperate with last hypotenuse, and going up horizontal straight flange can cooperate with following horizontal straight flange.

Syringe of the present utility model is characterized in that, the piston rod of piston has the part of diameter reduction.

Syringe of the present utility model is characterized in that, the bottom of the piston rod of piston has a stopper portions, the limit, left side of stopper portions from the distance of piston centrage greater than the syringe radius.

Syringe of the present utility model is characterized in that, comprises that also one is installed in the sealing member of piston upper end.

Syringe of the present utility model is characterized in that, the top of syringe is a little cylinder, and the bottom is a large cylinder, and two cylinders are connected as a single entity by shoulder, and there is an inward flange upper surface of little cylinder, and inner wall even distribution has a plurality of axial raised lines.

Syringe of the present utility model, it is characterized in that, needle holder comprises a bottom pedestal, an inner circular cone and an outer circle cylindrical shell, inner circular cone and outer circle cylindrical shell and bottom pedestal are structure as a whole: the bottom pedestal has a circle taper hole, one centre bore is in the inner circular cone, and conical bore is coaxial with centre bore; Needle holder is installed in the little cylinder of syringe, the bottom pedestal of needle holder can slide along the inner wall sealing ground of little cylinder: the outer wall of outer circle cylindrical shell is evenly equipped with many axial raised lines, the external diameter of outer circle cylindrical shell is greater than the internal diameter of the inward flange of little cylinder, and the inwall of outer circle cylindrical shell has female thread.

Syringe of the present utility model is characterized in that, needle holder comprises the cylinder of a bottom and the cone on a top, and cylinder and cone are connected as a single entity; There is an outward flange upper end of cylinder, and outward flange can slide along the inner wall sealing ground of the ringlet tube of syringe; One centre bore is in the cone on the cylinder of bottom and top, and the outer wall of cone has 6/100 tapering.

Syringe of the present utility model can be realized the function of needle retractable equally, but required part is few, and is simple in structure, easy to process, and corresponding cost has also reduced, and is fit to do disposable syringe and uses.

Description of drawings

Below in conjunction with the drawings and specific embodiments syringe of the present utility model is further described.

Fig. 1 is the vertical profile sketch map of syringe of the present utility model;

Fig. 2 is the perspective diagram of syringe shown in Figure 1;

Fig. 3 is the finish vertical profile sketch map of state of injector to inject shown in Figure 1;

Fig. 4 is that the master of the needle holder of syringe shown in Figure 1 looks sketch map;

Fig. 5 is the vertical profile sketch map of syringe needle headstock shown in Figure 4;

Fig. 6 is that the A of the block on the syringe needle headstock centre bore wall of Fig. 5 is to enlarged diagram;

Fig. 7 is the vertical profile sketch map that is in the broken positions place after syringe shown in Figure 1 is extracted;

Fig. 8 is the local enlarged diagram of Fig. 3;

Fig. 9 is the vertical profile sketch map of the syringe front end of another embodiment of the present utility model;

Figure 10 to Figure 12 is the vertical profile perspective diagram of Fig. 4 to syringe needle headstock shown in Figure 6;

Figure 13 to Figure 16 is the perspective diagram of course setter of the piston of Fig. 1 and syringe shown in Figure 9.

The specific embodiment

Fig. 1 extremely syringe 1 shown in Figure 3 comprises that a syringe 2, a piston 3, a needle holder 4, have holder 5, a sealing member 50 and a needle guard 80 of syringe needle.The top of syringe 2 is a roundlet tube 20, and the bottom is that 22, two cylinders of a large cylinder are connected as a single entity by shoulder 6.There is an inward flange 7 upper surface of the roundlet tube 20 of syringe 2.The inner wall even distribution of the roundlet tube 20 of syringe 2 has a plurality of axial raised lines 21 as shown in Figure 7.There is an outward flange 8 lower surface of the large cylinder 22 of syringe 2, and there is anti-skidding raised line the upper surface of outward flange 8.The inward flange 10 that on the inwall of large cylinder 22 adjacent flange 8 of syringe 2 two radial sections to be arranged be semicircle is used for the moving range of limited piston 3 in syringe.Needle holder 4 is shown in Fig. 4-6, and its underpart pedestal 25 is cylinders that conical bore 26 is arranged in; Its top is made up of a co-axial inner circular cone 27 and an outer circle cylindrical shell 28, and the centre bore 29 of cone 27 is coaxial with the conical bore 26 in the pedestal 25.Be evenly equipped with 4 blocks 30 on the hole wall surface of the inwall middle part sustained height scope of centre bore 29.To shown in Figure 12, block 30 thickness are even as Figure 10, have intersect at a point one on a horizontal straight flange 81 and a following hypotenuse 82 at vertical direction.Block 30 shown in Figure 10 is a triangle, and leg-of-mutton other both sides intersect at intersection point 86.Block 30 shown in Figure 11 is a tetragon, and tetragon also has a vertical edge 85.Block 30 shown in Figure 12 is a tetragon, and tetragonal other both sides intersect at intersection point 87.Figure 10 is to the maximal projection equal in length of each block 30 on horizontal plane shown in Figure 12.Cone 27 and cylinder 28 are structure as a whole with pedestal 25.Needle holder 4 is installed in the roundlet tube 20 of syringe 2, and the pedestal 25 of needle holder 4 can slide along the inner wall sealing ground of roundlet tube 20.The outer wall of cylinder 28 is evenly equipped with many axial raised lines 31, and each raised line 31 just inserts between two raised lines 21 of roundlet tube 20 inwalls of syringe 2, stops needle holder 4 at syringe 2 internal rotation.The external diameter of the cylinder 28 of needle holder 4 is greater than the internal diameter of the inward flange 7 of the roundlet tube 20 of syringe 2.The inwall of cylinder 28 has the female thread that cooperates with the external screw thread of the holder 5 with syringe needle.Piston 3 comprises the course setter 32 on a top and the piston rod 33 of a bottom.The piston rod 33 of course setter 32 and bottom is connected as a single entity.Course setter 32 comprises a flange 34, a sealing member holder 35 and a round bar 36.As scheme shown in Figure 8ly, and a sealing member 70 is installed on the sealing member holder 35, and the taper seat 71 of the upper end of sealing member 70 cooperates with the taper hole 26 of needle holder 4, and the narrow face of cylinder 72 of sealing member 70 is slidingly matched with the inner wall sealing of syringe 2.Round bar 36 has an arc surface top.Be evenly equipped with 4 projections 37 on the outer wall surface of the middle part sustained height scope of round bar 36.To shown in Figure 16, projection 37 thickness are even, have horizontal straight flange 83 and a hypotenuse 84 on vertical direction that intersects at a point once as Figure 13.Projection 37 shown in Figure 13 is a triangle, also has a vertical edge 89.Projection 37 shown in Figure 14 is a pentagon shape, also has a short vertical edge 92 and a long vertical edge 93.Projection 37 shown in Figure 15 is a tetragon, also has a short vertical edge 90 and a long vertical edge 91.Projection 37 shown in Figure 16 is a pentagon shape, also has a short vertical edge 94 and a long vertical edge 95.Figure 13 is to the maximal projection equal in length of each projection 37 on horizontal plane shown in Figure 16, and equals left end point the distance projection horizontal plane between of Figure 10 to the right endpoint of the last horizontal straight flange 81 of a block 30 shown in Figure 12 horizontal straight flange 81 on the projection on the horizontal plane and adjacent another block 30.The lower piston bar 33 of piston 3 comprises that a cross section is a criss-cross bar 40 and a flange 39 that links to each other with its lower end.There is anti-skidding raised line the lower surface of flange 39; The criss-cross one side 42 of the hypomere of bar 40 has a stopper portions 41.The lower end of stopper portions 41 links to each other with flange 39, the upper right corner, upper end of stopper portions 41 links to each other with limit 42 by a connection strap part 44, the right edge of stopper portions 41 and limit 42 are spaced apart, the limit, left side of stopper portions 41 from the distance of piston centrage greater than the syringe radius, prevent that piston rod from all entering in the syringe, stop piston 3 under unused state, to cooperate with needle holder 4.There is a diameter reduction place 43 at flange 34 places of bar 40 contiguous course setters 32.

Shown in Figure 9 is another embodiment of the present utility model, and present embodiment has been done a little changes aspect the cooperating of needle holder and needle holder and the holder with syringe needle, and needle holder is identical with previous embodiment with the cooperation of piston.The needle holder 4 of present embodiment ' the comprise cylinder 50 of a bottom and the cone 60 on a top.Cylinder 50 is connected as a single entity with cone 60.Cylinder 50 forms an outward flange 51 with the junction of cone 60.Outward flange 51 can slide along the inner wall sealing ground of the roundlet tube 20 of syringe 2.Needle holder 4 ' the hole wall surface of inner hole wall middle part sustained height scope of cone 60 on top on be evenly equipped with 4 tetragon blocks 63, the embodiment of structure and front such as Figure 10 block 30 extremely shown in Figure 12 is identical.The outer wall 61 of cone 60 has 6/100 tapering.Have the holder 5 of syringe needle ' have and needle holder 4 ' the conical surface that cooperates of outer wall 61, have the holder 5 of syringe needle ' maximum gauge less than the internal diameter of the flange 7 of the roundlet tube 20 of syringe 2, can be in the needle holder 4 ' syringe 2 of withdrawing.

The work process of syringe of the present utility model is as follows:

During use, install the holder with syringe needle 5 of band needle guard 80, by the piston rod 33 of flange 39 downward pulling pistons 3, piston 3 moves down, and sucks injection.At this moment, to intrinsic pressure, 44 fractures of connection strap part move inward stopper portions 41 with the upper end of stopper portions 41.At this moment, upwards promote the piston rod 33 of piston 3 by flange 39, piston 3 moves up, and injects.In piston rod 33 processes that upwards promote piston 3, the round bar 36 of the course setter 32 of piston 3 enters in the centre bore 29 of needle holder 4, the last end in contact of the last hypotenuse 84 of the projection 37 on the lower end of the following hypotenuse 82 of the block 30 on centre bore 29 hole wall surfaces and round bar 36 outer wall surface, under the guiding and pressure effect of the following hypotenuse 82 of block 30, round bar 36 produce around its centrage to the torsional deflection of a direction and move up, when the upper end of following hypotenuse 82 of block 30 is left in the lower end of the last hypotenuse 84 of projection 37, the last hypotenuse 84 of the projection 37 on round bar 36 outer wall surface no longer is subjected to the guiding and the pressure effect of the following hypotenuse 82 of block 30, round bar 36 produces around the torsional deflection to another direction of its centrage and recovers, round bar 36 is got back to original form, at this moment, the last horizontal straight flange 81 of the block 30 on centre bore 29 hole wall surfaces be positioned at the projection 37 on round bar 36 outer wall surface following horizontal straight flange 83 below, the following intersection point 86 of block 30 shown in Figure 10, the following intersection point 87 of the vertical edge 85 of block 30 shown in Figure 11 or block 30 shown in Figure 12 is pressed on projection shown in Figure 14 37 long vertical edges 93 or the projection 37 long vertical edges 95 shown in Figure 16.

After injection finishes, spur the piston rod 33 of piston 3 downwards by flange 39, piston 3 moves down, the last horizontal straight flange 81 of the block 30 on the following horizontal straight flange 83 of the projection 37 on round bar 36 outer wall surface of the course setter 32 of piston 3 and centre bore 29 hole wall surfaces of needle holder 4 cooperates, needle holder 4 and the holder 5 with syringe needle are drawn in the syringe 2 with piston 3, avoid syringe needle to hurt sb.'s feelings.When the flange 34 of piston 3 contacts with the flange 10 of syringe 2 inwalls, the diameter reduction place 43 of the criss-cross bar 40 of the lower piston bar 33 of piston 3 is on the same horizontal plane with the flange 10 of syringe 2, as shown in Figure 7, the bar 40 of piston 3 fractures at diameter reduction place 43, the course setter of piston 3 is stayed in the syringe 2, syringe can not be reused, avoid syringe to be used and communicate illness once more.

According to embodiments of the invention describing the present invention property and nonrestrictive description; But should be understood that under the situation that does not break away from relevant protection domain defined by the claims those skilled in the art can make change and/or revise.

Claims

1, a kind of syringe, comprise a piston, one syringe, one needle holder and one has the holder of syringe needle, it is characterized in that, be evenly equipped with a plurality of blocks on the hole wall surface of the inwall middle part sustained height scope of the centre bore of needle holder, block thickness is even, have a horizontal straight flange and a following hypotenuse at vertical direction on crossing, be evenly equipped with a plurality of projections on the outer wall surface of the middle part sustained height scope of the round bar of piston, projection thickness is even, has crossing horizontal straight flange and a hypotenuse on vertical direction once, following hypotenuse can cooperate with last hypotenuse, and going up horizontal straight flange can cooperate with following horizontal straight flange.

2, syringe according to claim 1 is characterized in that, the piston rod of piston has the part of diameter reduction.

3, syringe according to claim 1 and 2 is characterized in that, the bottom of the piston rod of piston has a stopper portions, the limit, left side of stopper portions from the distance of piston centrage greater than the syringe radius.

4, syringe according to claim 1 and 2 is characterized in that, comprises that also one is installed in the sealing member of piston upper end.

5, syringe according to claim 3 is characterized in that, comprises that also one is installed in the sealing member of piston upper end.

6, syringe according to claim 1 is characterized in that, the top of syringe is a little cylinder, and the bottom is a large cylinder, and two cylinders are connected as a single entity by shoulder, and there is an inward flange upper surface of little cylinder, and roundlet tube inner wall even distribution has a plurality of axial raised lines.

7, syringe according to claim 6 is characterized in that, needle holder comprises a bottom pedestal, an inner circular cone and an outer circle cylindrical shell, and inner circular cone and outer circle cylindrical shell and bottom pedestal are structure as a whole; The bottom pedestal has a conical bore, and a centre bore is in the inner circular cone, and conical bore is coaxial with centre bore; Needle holder is installed in the little cylinder of syringe, and the bottom pedestal of needle holder can slide along the inner wall sealing ground of little cylinder; The outer wall of outer circle cylindrical shell is evenly equipped with many axial raised lines, and the external diameter of outer circle cylindrical shell is greater than the internal diameter of the inward flange of little cylinder, and the inwall of outer circle cylindrical shell has female thread.

8, syringe according to claim 6 is characterized in that, needle holder comprises the cylinder of a bottom and the cone on a top, and cylinder and cone are connected as a single entity; There is an outward flange upper end of cylinder, and outward flange can slide along the inner wall sealing ground of the little cylinder of syringe; One centre bore is in the cone on the cylinder of bottom and top, and the outer wall of cone has 6/100 tapering.

9, syringe according to claim 7 is characterized in that, the bottom of the piston rod of piston has a stopper portions, the limit, left side of stopper portions from the distance of piston centrage greater than the syringe radius.

10, syringe according to claim 8 is characterized in that, the bottom of the piston rod of piston has a stopper portions, the limit, left side of stopper portions from the distance of piston centrage greater than the syringe radius.