CN1190241C - Modified over-load safety syringes for intravenous injection - Google Patents

Abstract

An improved external-mounted safety syringe for intravenous injection is characterized in that a retractable needle set can automatically deflect when retreating into the syringe after injection is finished, and the retractable needle set does not extend forwards to stab; a ratchet hook part is arranged at the end of the piston rod adjacent to the piston, the piston rod is installed in the needle cylinder, the piston rod is longitudinally pulled and retreated, and the ratchet hook part on the rod is blocked on a flange ring at the rear part of the needle cylinder, so that the piston rod and an injected needle tool coupled on the piston are ensured not to be pulled out; at least one pair of salient points is arranged on the needle cylinder wall in a protruding way to guide the cross-shaped rod piece of the piston rod in a sliding way, so that the piston rod can not rotate and the eccentric inclined socket arranged on the piston can be ensured to accurately buckle the buckling head part of the needle tool when the injection is finished, thereby retracting and inclining the needle tool in the needle cylinder.

Description

Be applicable to intravenous improved external safety syringe tube

Technical field

The invention relates to a kind of intravenous improved external safety syringe tube that is applicable to.

Background technology

The inventor's application for a patent for invention formerly, name is called " external safety syringe tube of improvement ", and its safety syringe-drum can contract and move back entry needle and enter in the syringe deflection automatically after injection is finished, and no longer stretches out the thorn people.Its major defect is:

When it was applied in intravenous injection, because needle set has been loaded on a side of syringe prejudicially, in injection process, if piston rod was rotation, and then the discount portion buckle in addition that can't aim at needle set of the deflection pod on the piston loses the safeguard protection effect easily.

Summary of the invention

At above-mentioned defective, the inventor is the active research improvement, creates the intravenous improved external safety syringe tube that is applicable to of the present invention.

The purpose of this invention is to provide a kind of intravenous improved external safety syringe tube that is applicable to, by in the syringe front end be longitudinally set with the prominent rib of most bars on the needle guard hole wall of the eccentric needle guard portion that is provided with, place outside the pin stem of corresponding DIYU needle set and be longitudinally set with the prominent rib of most bars, fasten this pin stem in needle guard portion, in outside adorn, screw hollow needle in pin stem, because of the prominent rib of the prominent rib engaging needle guard portion of pin stem is not reversed, this hollow needle of spinning smoothly; Adjacent piston end in piston rod is provided with the ratchet hook portion, piston rod is installed in syringe, and vertical drawing moved back piston rod, and the ratchet hook portion block on this bar guarantees can not pull out the needle set of having injected of institute's coupling on piston rod and the piston in the bead ring at syringe rear; Prominent at least one pair of salient point of establishing on needle cylinder wall with the cross bar sheet of this piston rod of correcting slidably, can not rotate piston rod, can guarantee injection at the end, the deflection pod of the eccentric setting of the institute discount portion of this needle set of buckle exactly on the piston.So that shrink back, this needle set of deflection is among syringe.After reaching injection and finishing, in the needle set that contracts be retracted in the syringe deflection automatically, stretch out the purpose that thorn is hurted sb.'s feelings forward again.

The object of the present invention is achieved like this: a kind ofly be applicable to intravenous improved external safety syringe tube, it is characterized in that: it comprises: its front end of a needle cylinder device is provided with a needle guard portion prejudicially; One needle set is installed on this needle cylinder device, comprises a hollow needle, a pin stem and a discount portion, and this pin stem spiral-lock is in this needle guard portion, and this hollow needle is adorned outward, is combined in this pin stem; One piston apparatus sleeves in this needle cylinder device, off-centre is arranged with a deflection pod on this piston, the discount portion of aligning, this needle set of buckle is retracted into automatic deflection in the needle cylinder device to contract, and it is characterized in that: be longitudinally set with the prominent rib of most bar needle guards on the hole wall in the needle guard hole of this needle guard portion; This pin stem is provided with most pin belemnoid ribs and is longitudinally set with outside this pin stem and places, to engage the prominent rib of needle guard in this needle guard hole; This needle cylinder wall is provided with a guide device with this piston apparatus that coincide slidably, makes in injection process and can not rotate this piston apparatus.

This guide device is to comprise that at least one pair of salient point is based in this syringe inwall, with the bar sheet of the piston rod of this piston apparatus that coincide slidably.This pin stem comprises that a packing ring is located in this pin stem, and block is in the rib end of the prominent rib of this needle guard.This pin stem comprises that a flanged disc is connected with in this pin stem rear end, in the depression that is fastened on one of this needle guard portion.It is curved that the piston rod front end of this piston apparatus is connected with the leading edge of a disk, is provided with most or at least one ratchet hook portion along the circumferential ring of this disk, is provided with a bead ring in the syringe of this needle cylinder device trailing edge; This piston rod syringe inside of packing into, the curved slide fastener of the leading edge of this disk, the bead ring by this syringe trailing edge; Draw and move back piston rod, each ratchet hook portion block is not drawn out in this bead ring.This ratchet hook portion is to form a plate-like ratchet hook portion.

Further specify below in conjunction with preferred embodiment and accompanying drawing.

Description of drawings

Piston fastened the cross-sectional schematic of the discount portion of needle set when Fig. 1 finished for the present invention's injection.

Automatically deflection, bending needle set prevent to stretch out forward the sketch map that stings the people to Fig. 2 for the back of contracting in the present invention.

Fig. 3 is the B-B cross-sectional schematic of Fig. 1.

Fig. 4 is a ratchet hook portion sketch map of the present invention.

The specific embodiment

Consult Fig. 1-shown in Figure 4, the present invention includes: a needle cylinder device 1, one needle set 2 is installed on this needle cylinder device 1 prejudicially, sleeves in this needle cylinder device 1 with a piston apparatus 3.

This needle cylinder device 1 comprises: the tube inner 10 of a syringe portion 11 is for the dressing liquid medicine injection, one needle guard portion 12 is connected with prejudicially in the front end of this syringe portion 11, be provided with needle guard hole 12a in it, one shoulder 13 is between this syringe portion 11 and needle guard portion 12, one syringe rear flange 14 is located at syringe portion trailing edge, and one bead ring 15 be located on inner 10 trailing edges of tube, adjacent this rear flange 14.Adjacent bead ring 15 places in this syringe portion 11 are provided with 4 pairs of salient points 16 diagonally along the syringe internal diameter, and the logarithm or the number of salient point 16 are that the end adds restriction certainly, and each is to each bar sheet 351 of the piston rod 35 of salient point 16 proper these piston apparatus 3 that coincide slidably, as shown in Figure 3.

These salient points 16 constitute the embodiment of ' guide device ' of the present invention, and other kinds correcting mechanism is changes in modification in addition also.

Be longitudinally set with the prominent rib 12b of most bar needle guards on the hole wall of the needle guard hole 12a of this needle guard portion 12, be arranged with the contiguous syringe shoulder 13 of a flanged disc depression 12c in trailing edge, as shown in Figure 2.

This needle set 2 comprises: the rear portion of a hollow needle 21 is connected with a coupling sheath 21a, be equipped with female thread 21b in it, a pin stem 22 is fastened among the needle guard hole 12a of this needle guard portion, and contains a flanged disc 22a and be connected with in pin stem 22 rear ends, to fasten the depression 12c in this needle guard portion, as shown in Figure 1.Most pin belemnoid rib 22b are longitudinally set with outside this pin stem 22 and place, and to engage the prominent rib 12b of needle guard in this needle guard hole, are located in this pin stem 22 with a packing ring 22c, and block is in the rib end of the prominent rib 12b of this needle guard, with the effect that prevents that medicinal liquid from exosmosing.One coupling bar 22d is connected with in the front end of this pin stem 22, contains at least one pair of lug 22e, when outer dress needle set 2, engages the female thread 21b in this hollow needle coupling sheath 21a.One discount portion 23 is located at the needle set rear end, offers outage 24 in it, to communicate with the mesopore 20 of needle set, injecting liquid drug is gone into human body.

When hollow needle 21 is installed, the axle center 200 of pin 21 is the axle center X that are parallel to syringe 11, when rotation coupling sheath 21a, when making its female thread 21b screw lug 22e on this coupling bar 22d, because the prominent rib 22b of pin stem can be snapped in the prominent rib 12b of needle guard in the needle guard portion, so pin stem 22 can not changeed by hollow needle coupling sheath 21a interlock, band, that is pin stem 22 can not rotate, and can allow hollow needle successfully be combined on the coupling bar 22d of pin stem.

When injection finished, the discount portion 23 of the deflection pod 32 buckle needle sets in the piston 31 of piston apparatus 3 buckled in the pod 32 through guiding port 33, and note: pod 32 also returns prejudicially to be located in the piston 31, can aim at the discount portion 23 of the needle set of this off-centre setting; When drawing when moving back piston 31, needle set 2 is shunk back into syringe inside 10 in the lump by coupling, deflection shape as shown in Figure 2, and when releasing forward, needle set 2 is multiple not overhanging by bending, and reaches safety again.

Piston rod 35 front ends of this piston apparatus 3 are connected with a disk 35a; before connect a buckle end 34; with buckle piston 31; and disk 35a rear; be set up in parallel a plate-like ratchet hook portion 35b or circumferential ring and be provided with majority (as eight) ratchet hook portion 35b in disk 35a rear along disk 35a; as shown in Figure 4; after piston rod 35 is packed syringe inside 10 into; the leading edge of disk 35a is curved, but slide fastener; by the bead ring 15 of syringe trailing edge, but when drawing when moving back piston rod 35; each ratchet hook portion 35b is that block is in bead ring 15; be not drawn out, so after injection finishes, guarantee that piston 31 couplings have the needle set of injecting 2; also can not pull out from the syringe rear; so needle set must not protract, retreating does not have door, guarantees that further the safety of safety syringe-drum of the present invention does not have anxiety.

The structure of relevant ratchet hook portion 35b except that above-mentioned, also has other multiple modifications, changes, and the present invention is real not to be limited, and does not repeat.

The section of this piston rod 35 is cross; have 4 bar sheets 351; as shown in Figure 3; each bar sheet 351 is fit to each slidably within the salient point 16, is subjected to the correcting of two salient points 16, in injection process; piston apparatus 3 can not be rotated; that is guarantee that the deflection pod 32 on the piston 31 fastens the discount portion 23 of this needle set 2 exactly, after having injected, can draw in the lump to be retracted into automatic deflection in the syringe 11 and safety.Each is bead ring 15 places of contiguous this syringe to salient point 16, as shown in Figure 1, 2.The size of each salient point 16 and projection highly are designed to can not influence the action that piston 31 is fit into syringe 11.If there are not these salient point 16 mechanism such as correcting such as grade, then piston in injection process in case rotation a little, then pod 32 can't aim at, the discount portion 23 of buckle needle set 2, promptly can't draw withdraw of the needle tool to enter in the syringe 11, so salient point 16 is a novel feature part of the present invention.

All spirit of the present invention and categories do not disobeyed are done appropriate modification or change down, all belong within the protection domain of reality of the present invention.

Claims (6)

1. An improved exterior-mounted safety syringe suitable for intravenous injection, which is characterized in that it includes: a syringe device whose front end is eccentrically provided with a needle cover; a needle is installed on the syringe device, It includes a hollow needle, a needle stem and a buckle head, the needle stem is buckled in the needle cover, the hollow needle is externally mounted and screwed on the needle stem; a piston device is slid on the needle In the cylinder device, a deflection socket is provided eccentrically on the piston, which is aligned and buckled with the buckle head of the needle, so as to retreat into the needle cylinder device and automatically deflect. The feature is: the needle sleeve The hole wall of the needle sheath hole is provided with a plurality of needle sheath ribs; the needle stem is provided with a plurality of needle sheath ribs vertically arranged on the outer periphery of the needle sheath to engage the needle sheath in the needle sheath hole Projecting ribs; a guiding device is provided on the wall of the syringe to slideably fit the piston device so that the piston device does not rotate during the injection process. 2. The improved exterior-mounted safety syringe suitable for intravenous injection according to claim 1, characterized in that: the guiding device includes at least a pair of protrusions protruding from the inner wall of the syringe, so as to fit the Rod piece of the piston rod of a piston device. 3. The improved exterior-mounted safety syringe suitable for intravenous injection according to claim 1, characterized in that: the needle stem includes a tightening ring set on the needle stem to stop at the needle sleeve protrusion The rib end of the rib. 4. The improved exterior-mounted safety syringe suitable for intravenous injection according to claim 1, characterized in that: the needle stem part includes a flange plate connected to the rear end of the needle stem part, so as to be fastened to the In the recess of one of the needle guard parts. 5. The improved exterior-mounted safety syringe suitable for intravenous injection according to claim 1, characterized in that: the front end of the piston rod of the piston device is connected with a disc, the front edge of which is arc-shaped, and along the disc The circumferential ring is provided with a plurality or at least one ratchet hook, and a flange ring is provided in the syringe at the rear edge of the syringe device; the piston rod is loaded into the interior of the syringe, and the front edge of the disc is an arc-shaped sliding buckle 1. Through the flange ring at the rear edge of the syringe; pull back the piston rod, and each ratchet hook is blocked by the flange ring and cannot be pulled out. 6. The improved exterior-mounted safety syringe suitable for intravenous injection according to claim 1, characterized in that: the ratchet hook is formed into a disc-shaped ratchet hook.