CN1325736A - High-safety injector - Google Patents

Abstract

A high-safety injector is composed of injecting cylinder, needle set, match mechanism, push rod and match head. Said match mechanicam positioned in the front of injecting cylinder and at back end of needle set has a match hole, which can be matched with the push rod when the push rod moves to the front end of injecting cylinder. When said push rod is drawn back, the match mechanism and needle set can be pulled in chamber of injecting cylinder, preventing needle from pricking human body.

Description

Safety injector

The present invention is relevant a kind of syringe construction, be in particular a kind of after injection finishes, can be with the safety injector of syringe needle group income injector to inject tube inboard.

Present known safety injector, its characteristics are to allow user (as nurse or doctor) after using syringe, the syringe needle group can be returned in the injection tube, stab human body because of managing accidentally, avoid causing user to suffer the infection of antibacterial or virus to prevent needle body.

For example the TaiWan, China patent announcement promptly is for No. 356013 the structure-improved that discloses relevant safety injector, but in this case, its push rod still might cause slight seismism and may cause the discomfort of patient infusion process when engaging syringe needle group, the design of the seismism when therefore reducing push rod engaging syringe needle group again has needs.

The object of the present invention is to provide a kind of safety injector, it can be returned to the syringe needle group in the injection tube after finishing using, and stabs human body to avoid needle body.

A further object of the present invention is to provide a kind of can reduce seismism in injection process, to avoid because of producing the obviously safety injector of vibrations twinge human body suddenly.

Another purpose of the present invention is to provide a kind of safety injector of making man-hour, reducing production costs of saving.

A kind of safety injector of the present invention is characterized in that, comprising: an injection tube, it is the cylindrical tube with accommodating chamber; One syringe needle group, it comprises the needle body of a hollow and the needle stand of a hollow, this needle body one end is fixedly arranged on this needle stand; One snap fastener, its can fit on the inwall of this injection tube accommodating chamber and movable slippage in wherein, snap fastener comprises that one has the block base of hollow chamber and the elastomer of a hollow and annular, this block base comprises that again a dish seat and with preceding hole has the holding section of connecting hole, wherein preceding hole communicates with connecting hole and forms hollow chamber, this dish seat can be in conjunction with the needle stand of this syringe needle group, this holding section is positioned at this dish base rear end, this block base includes the bonded block of a plurality of elasticity, but the connecting hole of using the condensation of formation elasticity or supporting, and this elastomer is located at the outside of this holding section; One push rod, its front end is provided with a piston, and the rear end is provided with one and pushes away handle; And: a dop, it is located at this push rod front end and protrudes from this piston nose, and this dop comprises a head and a projection, and this head is linked to this projection front end, the cross section of this head front end is little than the rear end, and the connecting hole of the cross section of this head rear end integral body during then than condensed state is big.

Wherein these blocks are to protrude in the hollow chamber internal face.

Wherein these blocks are the trips that are extended with the overhead kick shape towards the direction of hollow chamber internal face respectively.

Wherein these blocks are to be arranged on the periphery of this holding section with equidistant position relation each other.

Wherein this elastomer is to be located at the block outside in the fit mode.

Wherein this elastomer is in the block outside with the direct attached work of shoot mode.

When push rod extreme direction before injection tube is advanced near foremost the time, this head can support connecting hole, and engaging is positioned the snap fastener inboard after by this connecting hole, making it can't be by pulling out in the connecting hole, make that snap fastener together is pulled in the accommodating chamber of injection tube together with the syringe needle group when push rod is extracted backward.

Because elastomer is easy and the connecting hole collocation design, so when push rod is shifted onto foremost, and when making dop engage with snap fastener, elastomer can cooperate the elasticity of connecting hole to support with condensation to move, the action of auxiliary buffering connecting hole, when dop is engaged mutually with snap fastener, seismism can be reduced to minimum, thereby avoid the twinge human body.

The present invention is described in further detail below in conjunction with accompanying drawing in order to further specify structure of the present invention and feature thereof, wherein:

Fig. 1 is a three-dimensional exploded view of the present invention.

Fig. 2 is the three-dimensional exploded view of block base in the first embodiment of the invention.

Fig. 3 is the axonometric chart after the block base combination in the first embodiment of the invention.

Fig. 4 is the block base first status architecture cutaway view in the first embodiment of the invention.

Fig. 5 is the block base second status architecture cutaway view in the first embodiment of the invention.

Fig. 6 is a block base third state structure cutaway view in the first embodiment of the invention.

Fig. 7 is that push rod is pushed into the cutaway view of injection tube foremost the time in the first embodiment of the invention.

Fig. 8 is the cutaway view when push rod draws in the syringe needle group in the injection tube in the first embodiment of the invention.

Fig. 9 is the three-dimensional exploded view of block base in the second embodiment of the invention.

Figure 10 is the axonometric chart after the block base combination in the second embodiment of the invention.

Figure 11 is the block base first status architecture cutaway view in the second embodiment of the invention.

Figure 12 is the block base second status architecture cutaway view in the second embodiment of the invention.

Figure 13 is the cutaway view when push rod draws in the syringe needle group in the injection tube in the second embodiment of the invention.

The structure of first embodiment of the invention please cooperate and consult Fig. 1 to Fig. 8, and safety injector 10 of the present invention mainly comprises an injection tube 20, a syringe needle group 30, a snap fastener 50, a push rod 60 and a dop 70.

The main body of this injection tube 20 is one to have the cylindrical tube 25 of accommodating chamber 24, in present embodiment, this injection tube front end 21 is to be reducing shape slightly, and has a front aperture 211, this injection tube rear end 22 then has a back stomidium 221, wherein this front aperture 211 and this back stomidium 221 are to communicate and form this accommodating chamber 24, the interior sidewall surface of these accommodating chamber 24 front ends is provided with the stopper 26 of annular projection, then be provided with the projection 27 of annular projection on the interior sidewall surface of accommodating chamber 24 rear ends: in addition, grip for ease of user, this injection tube rear end 22 includes a Handheld Division 23.

This syringe needle group 30 includes the needle body 31 of a hollow and the needle stand 32 of a hollow, one end of this needle body 31 is fixed on this needle stand 32, these needle stand 32 rear ends include a retaining wall 33, the external diameter of this retaining wall 33 is the internal diameters that are not more than these accommodating chamber 24 stoppers 26 in present embodiment, and has the effectiveness that the block effect is provided and strengthens obturation effect; Because both fixed forms of needle body 31 and needle stand 32 are to belong to known techniques, can implement easily for haveing the knack of this skill personage, do not give unnecessary details so do not add in this; In addition, both structural designs of this stopper 26 and this retaining wall 33 also can be adopted with other equivalent structural designs and be reached, in this and give and indicating.

This snap fastener 50 can fit on the inwall of these injection tube 20 accommodating chambers 24, and this snap fastener 50 comprises that one has the block base 51 of hollow chamber 56 and the elastomer 57 of a hollow and annular in present embodiment, as shown in Figure 2.

This block base 51 comprises that again a dish seat 52 and with preceding hole 521 has the holding section 54 of connecting hole 541, and this preceding hole 521 communicates with connecting hole 541 and forms hollow chamber 56.

These dish seat 52 front ends can be incorporated into needle stand 32 rears of this syringe needle group 30, in present embodiment, this dish seat 52 is provided with and contacts the wide annular projection in wall place 53 with accommodating chamber 24, this jut 53 can be connected to needle stand 32 rears, it also has strengthens airtight effect, to avoid liquid (as medicinal liquid or blood) excessive; In fact, jut 53 also can change with or cooperate again and utilize O shape seal ring (figure does not show), make obturation effect better, in this and give and indicating.

This holding section 54 is positioned at this dish seat 52 rear ends, in present embodiment, both adopt integrally formed making this holding section 54 and dish seat 52, this holding section 54 includes a pair of block 55 that equidistant (180 ° of diagonal angles) is provided with that is each other, these blocks 55 have part and holding section 54 to link, elastomer 57 then is sheathed on the outside of this holding section 54, as shown in Figure 3, make when elastomer 57 is sheathed on these 54 outsides, holding section, these blocks 55 will flexibly protrude in the internal face of this hollow chamber 56 because of the elastic compression of this elastomer 57, and wherein this elastomer 57 can be adopted with the rubber material of tool elastic telescopic characteristic and make.

Certainly, the quantity of block 55 is not restricted to two, it also can be three, four or five or other quantity, only, be noted that these blocks 55 position that is provided with each other should be good with set-up mode equidistant, symmetric position, for example, when block 55 quantity are three, 120 ° of angles of its each interval.

These push rod 60 front ends are provided with a piston 61, and push rod 60 rear ends are provided with one and push away handle 62, and this push rod 60 can be inserted by the back stomidium 221 of injection tube 20, and this structure is identical with known person.

This dop 70 is located at this push rod 60 front ends, and protrude from the front end of this piston 61, in present embodiment, this dop 70 is the rough umbrellas that are, it is to comprise a head 71 and a projection 72, this head 71 links and is fixedly arranged on this projection 72 front ends, and the front end of this head 71 is little than the rear end, and the formed connecting hole of block when the cross section of these head 71 rear end integral body then is the condensation shape 55 541 is big.

By this, as shown in Figure 4, in injection process, when the dop 70 of push rod 60 front ends (can have grooving enters snap fastener 50 with minimizing resistance in the middle of the dop 70, figure does not show) before not engaging snap fastener 50 as yet, these blocks 55 push because of the elasticity that is subjected to elastomer 57, and protrude in hollow chamber 56 walls and form connecting hole 541.

When dop 70 enters connecting hole 541, as shown in Figure 5, the connecting hole 541 aperture bores that are the condensation shape because of the external diameter of its head 71 rear ends greater than script, push away so block 55 can be squeezed toward lateral direction, elastomer 57 will produce partial distortion extension this moment, make dop 70 by connecting hole 541, when this state, because elastomer 57 has the effect of strain, so when upholding distortion, it will be with it to the existing squeeze force of block 55 scripts, auxiliary buffering (slowing down) block 55 outer speed of opening, make in outer the process of block 55 and tend towards stability, sliding suitable, reduce and the issuable seismism of mitigation script.

And after dop 70 passes through connecting hole 541, as shown in Figure 6, this elastomer 57 also will be with its buffering deformation characteristic that has, and make block 55 with steadily, sliding suitable speed returns back to original position, as shown in Figure 7, reduction and the issuable seismism of mitigation script.

After injection finished, when user can be extracted push rod 60 backward, at this moment, snap fastener 50 together was pulled to together with syringe needle group 30 in the accommodating chamber 24 of injection tube 20, as shown in Figure 8, stabs human body to avoid needle body 31.

Fig. 9 is extremely shown in Figure 13 to be the second embodiment of the present invention, please cooperate consult graphic, present embodiment is to be that block 45 designs in the present embodiment are slightly different with the first embodiment difference mainly, but the block base 41 of this snap fastener 40, dish seat 42, preceding hole 421, jut 43, hollow chamber 46 is still identical with first embodiment with elastomer 47, only, in the present embodiment, this holding section 44 is the blocks 45 that are equidistant setting each other in conjunction with four, and these blocks 45 are extended with the trip 451 of overhead kick shape respectively in the direction towards hollow chamber 46 internal faces, these trips 451 are before the head 71 that does not engage dop 70, and its formed connecting hole 441 cross sections are the maximum cross sections less than head 71.

As shown in figure 11, when these trips 451 are subjected to head 71 urgent squeezing, the elastomer 47 in the direction expansion laterally of these blocks 45 and the extruding outside produces deformation, make the head 71 of dop 70 be able to then enter and engage in the hollow chamber 46 by connecting hole 441, as shown in figure 12, after finishing using, when user can be extracted push rod 60 backward, make snap fastener 40 together be pulled in the accommodating chamber 24 of injection tube 20 together with syringe needle group 30, as shown in figure 13, to avoid needle body 31 to stab human body, all the other see also the explanation of first embodiment.

Be noted that, in the present embodiment, this elastomer 47 is good by the natural rubber material person of making, and this elastomer 47 can be sleeved on 44 outsides, holding section after block base 41 and the 42 integrally formed ejaculations of dish seat, or mode that can also the secondary injection molding, direct attached work is 44 outsides in the holding section, save number of assembling steps, use to save and make man-hour, and then more reduce production costs.

In sum, " safety injector " of the present invention as can be known really can its disclosed structure of mat and reach purpose of the present invention, and tool progressive and utility function are a typical patent of invention.Only, the above only is the embodiment that the present invention exemplified, and all according to the present invention's deutero-various modifications of institute and variation, neither disengaging spirit of the present invention is so must be as the criterion with claim.

Claims (6)

1. a safety injector is characterized in that, comprising:

One injection tube, it is the cylindrical tube with accommodating chamber;

One syringe needle group, it comprises the needle body of a hollow and the needle stand of a hollow, this needle body one end is fixedly arranged on this needle stand;

One snap fastener, its can fit on the inwall of this injection tube accommodating chamber and movable slippage in wherein, snap fastener comprises that one has the block base of hollow chamber and the elastomer of a hollow and annular, this block base comprises that again a dish seat and with preceding hole has the holding section of connecting hole, wherein preceding hole communicates with connecting hole and forms hollow chamber, this dish seat can be in conjunction with the needle stand of this syringe needle group, this holding section is positioned at this dish base rear end, this block base includes the bonded block of a plurality of elasticity, but the connecting hole of using the condensation of formation elasticity or supporting, and this elastomer is located at the outside of this holding section;

One push rod, its front end is provided with a piston, and the rear end is provided with one and pushes away handle; And:

One dop, it is located at this push rod front end and protrudes from this piston nose, and this dop comprises a head and a projection, and this head is linked to this projection front end, the cross section of this head front end is little than the rear end, and the connecting hole of the cross section of this head rear end integral body during then than condensed state is big.

2. safety injector according to claim 1 is characterized in that, wherein these blocks are to protrude in the hollow chamber internal face.

3. safety injector according to claim 1 is characterized in that, wherein these blocks are the trips that are extended with the overhead kick shape towards the direction of hollow chamber internal face respectively.

4. safety injector according to claim 1 is characterized in that, wherein these blocks are to be arranged on the periphery of this holding section with equidistant position relation each other.

5. safety injector according to claim 1 is characterized in that, wherein this elastomer is to be located at the block outside in the fit mode.

6. safety injector according to claim 1 is characterized in that, wherein this elastomer is in the block outside with the direct attached work of shoot mode.

Images