CN101411906A - Needle head structure of safety syringe - Google Patents

Abstract

The invention discloses a needle structure for a safety syringe, which is characterized in that an inner cavity of a hub is hollow; the hub consists of an upper part and a lower part; a step is formed between the upper part and the lower part of the hub; the outer wall of the upper part of the hub is provided with four wings; an included angle of 45 degrees is formed between two wings; the wings are symmetrical in pair; the outer wall of the lower part of the hub is provided with a limit convex ring of the hub; the side edges of the wings are fixed on the outer wall of the upper part of the hub, and the bottom edges of the wings are fixed on the upper surface of the step. The needle structure is quick and convenient to assemble, can achieve high degree automatic production, effectively improves production efficiency, reduces manufacturing cost, has a reasonable integral structure, has high working stability in actual use experiments, and avoids accidentally injuring medical staff and other correlative staff during operation.

Description

A kind of needle head structure of safety injector

Technical field:

The present invention relates to technical field of medical, specifically a kind of needle head structure of safety injector, particularly its mechanical connecting structure.

Background technology:

In the past, since disposable syringe is widely used, after syringe uses up, medical personnel use a needle cover to be enclosed within on the syringe needle, and then whole syringe lost, when handling exhausted syringe in this way, though syringe needle no longer is exposed at the needle tubing outside, but in the process of cover needle cover on syringe needle, all little because of the bore of syringe needle and needle cover, one is careless slightly, and syringe needle just can sting medical personnel on hand, cause the patient on one's body virus or antibacterial along with the syringe after using infects to medical personnel, and cause medical personnel to catch an illness or death, and these malpracticees, often there is what is heard various countries, particularly catching the innate immunity insufficiency disorder time group virus that can't treat at present is HIV (human immunodeficiency virus) etc., more cause medical personnel to be subjected to not guilty injury, so, the contingency that syringe needle tube is stabbed effectively prevented, be the task of top priority, very urgent.

The syringe needle of existing safety injector is to be fixed in injector cartridge tube neck inside in the close-fitting mode, yet, assembling hour hands head part is all assembled forward from the rear portion, assembling procedure is very complicated, in addition, conventional injector is in order to bear when injection from rear end medicinal liquid pressure, make injector cartridge tube cervical part of esophagus into pre-small post-large cone-shaped, external so as to stopping that needle holder skids off syringe cylinder forward, yet, pre-small post-large cone-shaped internal part, make needle holder successively slip in the injector cartridge easily, industrial circle is for solving this type of problem, now all from strengthening needle holder, the close-fitting power of syringe cylinder inwall is set about, yet, strengthen close-fitting power, but cause needle holder to be assembled in the interior difficulty of syringe cylinder neck, and, existing needle holder, injector cartridge is that the plastic cement with multi-point mould injects mold injection and goes out molding, since each die cavity inject environment (running channel position for example, penetrate temperature, rate of cooling etc.) be not identical completely, also ubiquity diversity between several moulds when adding mass production, therefore inject each needle holder of back, injector cartridge is difficult to its precision size of control, the close-fitting power of the two still is difficult for grasping, disqualification rate is higher, very perplexs industrial circle.

Documents one, the patent No.: ZL94103945.5, notification number: CN1100958, patentee: Inviro Medical Devices Ltd., a kind of " safety injector with needle guard and recoverable syringe needle " disclosed in this case, its principal claim content is: a kind of syringe, comprise a plunger and joint elements that have syringe needle, and these joint elements are tightened against the end of needle tubing.Joint elements and plunger respectively carry the syndeton that matches, and they can rotate with respect to needle tubing together when joint elements and plunger are engaged with each other, and syringe needle is withdrawn in the needle tubing.The surface of matching on needle guard and the needle stand can engage one another, and only will unscrew the opposite moment of torsion of direction with joint elements and be applied on the joint elements.Needle guard rotates in opposite direction, and the moment of torsion that joint elements are applied is not enough to the end of joint elements from needle tubing unscrewed.

Documents two, application number: 01141707.2, notification number: CN1406643, patentee: Luo Bizhang, disclose a kind of " needle holder of safety injector " in this case, its principal claim content is: the present invention mainly comprises injection tube, needle holder and pressure rings.The joint portion of needle holder leading portion is fixedly arranged in the little inside diameter of injection tube leading portion, and the holding section of back segment is provided with short slot, and the short slot content is provided with movable piece, and movable piece links sheet with the rear and is connected with on the holding section.Pressure rings is sheathed between the shoulder and flange of injection tube back segment large diameter portion inwall, and just in time corresponding to needle holder back segment holding section.Pressure rings inwardly is convexly equipped with shell fragment in corresponding short slot place, impels movable piece slightly inwardly outstanding.

Documents three, application number: 971900604, notification number: CN1178474, patentee: Specialized Health Products, Inc., a kind of " injector for medical purpose and self-retracting needle apparatus " disclosed in this case, its principal claim content is: a compositions, comprise an injector for medical purpose and an extended and self-retracting medical needle apparatus, described compositions comprises: a syringe cylinder part, comprise an elongate hollow cylindrical part and the end closed portion with an inner surface, the latter also has an inner surface; A plunger assembly is positioned at this hollow cylindrical part to small part, this assembly liquid containing space of formation that combines with this syringe cylinder, and the latter's volume can change with respect to reorientating of this plunger assembly because of this barrel part; This space to small part is limited by described inner surface; Described plunger assembly comprises: an elongate hollow shell, have an outer surface and one first end and one second end, the size of this outer surface allows it contactlessly to slide in described cylindrical form interior surface, this first end is placed within the described tube, and this second end is relevant with stretching out of described device; Described shell further comprise one can be by the lower part, the latter can be approaching from this barrel part outside by user; A stopper that cooperates certain locking mechanism, the arrangement of this stopper can be blocked it and can be pressed the position with this actual alternative this locking mechanism is arranged after this device stretches out; This extended and self-retracting medical needle apparatus comprises: an elastic hose, link to each other with this first end of described shell a rear end, and after this device stretches out, when the available use of this device, provide the retracting force and a liquid communication channel between a medical needle and this liquid containing space of a storage at least; A sleeve pipe mechanism, comprise a rear portion hose connector, a locking mechanism that can discharge connection and cooperate with this stopper, this connector can be connected this device securely with the front end in described flexible pipe ground, this connection is connected a drawing mechanism with described device.

Documents four, the patent No.: ZL96106985.6, notification number: CN1172678, patentee: Chen Longxiong, a kind of " deflection that contracts in the syringe needle is the safety injector of damage automatically " disclosed in this case, its principal claim content is: it is made up of syringe, syringe needle group and piston set, and the two ends of syringe are respectively needle cylindrical unit and neck tube; The syringe needle group is made up of hollow pinhead body and needle handle, and the bottom of needle handle central through hole constitutes the taper depression and the horn mouth of lack of alignment; Needle head body is fixedly mounted on the needle handle central through hole; Piston set is made up of piston and piston rod, and piston is provided with arrow body, and makes the centrage of arrow body be positioned on the syringe neck tube hub line.

This shows, still there are many defectives in above-mentioned existing safety injector with the syringe needle that is used for safety injector, still need prior art is further improved, make the structure of product more become to rationalizing, product has more practicality and stability, changes existing assembling mode, improves the packaging efficiency and the assembling speed of product, realize the height mass automatic production, increase the competitiveness of product in market.

Summary of the invention:

The object of the present invention is to provide a kind of needle head structure of safety injector, it can overcome existing product structure poor practicability, poor work stability, the packaging technology complexity, the assembling automaticity is low, and production efficiency is low, the production cost height, the shortcoming and defect that product competitiveness is low.

To achieve these goals, technical scheme of the present invention is: a kind of needle head structure of safety injector, it mainly comprises needle tubing, needle tubing is arranged in the needle stand, it is characterized in that: described needle stand inner chamber hollow, needle stand is made of top and portion, form a step between the upper and lower of needle stand, the outer wall place on needle stand top is provided with four fins, become 45 angles of spending between the every fin, symmetrical in twos between fin and the fin, needle stand bottom outer wall is provided with the needle stand position limiting convex ring, the side of fin is fixed in the outer wall on needle stand top, and the upper surface of step is fixed on the base of fin.

The invention discloses a kind of needle head structure of safety injector, syringe needle is by needle tubing, needle stand, sheath constitutes, sheath during assembling, needle stand once is assembled in the tube neck of injector cartridge from top to bottom, it is convenient to assemble, increasingly automated production, effectively improved production efficiency, reduce manufacturing cost, the product reasonable integral structure, in actual service test, working stability performance height, the mechanism that pulls back of piston boom end can closely cooperate with needle stand, syringe needle integral body is drawn in the syringe cylinder intracoelomic cavity, realize safe effect, avoided accidental injury medical personnel in operation and other related personnel.

Description of drawings:

Fig. 1 is a structural representation of the present invention

Fig. 2 is a needle stand structural representation of the present invention

Fig. 3 is a jacket structure sketch map of the present invention

Fig. 4 is the present invention's first assembled state reference diagram

Fig. 5 is the present invention's second assembled state reference diagram

Fig. 6 is the present invention's the 3rd assembled state reference diagram

Wherein:

1 needle tubing

2 needle stands

3 fins

4 needle stand position limiting convex rings

5 steps

6 sheaths

7 sheath bulge loops

The specific embodiment:

With reference to the accompanying drawings, the present invention further is described

The present invention is a kind of needle head structure of safety injector, it mainly comprises needle tubing 1, needle tubing 1 is arranged in the needle stand 2, it is characterized in that: described needle stand 2 inner chamber hollows, needle stand 2 is made of the upper and lower, form a step 5 between the upper and lower of needle stand 2, the outer wall place on needle stand 2 tops is provided with four fins 3, become 45 angles of spending between the every fin 3, symmetrical in twos between fin 3 and the fin 3, fin 3 can play well firm effect to sheath, needle stand 2 bottom outer walls are provided with needle stand position limiting convex ring 4, needle stand position limiting convex ring 4 can match with the groove of injector cartridge inwall after the syringe assembling is finished, play the effect of fixed needle base, the side of fin 3 is fixed in the outer wall on needle stand 2 tops, the upper surface of step 5 is fixed on the base of fin 3, the needle stand 2 outer sheaths 6 that are socketed with, the inner chamber hollow of sheath 6, the interior diameter of its inner chamber is between 3mm-9mm, the bottom of sheath 6 outer walls is provided with sheath bulge loop 7, the lower surface of described sheath bulge loop 7 is parallel with step 5 upper surfaces, in syringe needle part assembling process, the lower surface of sheath bulge loop 7 props up the upper surface of step 5, the total length of line is 3mm-9mm between fin 3 and the fin 3, the length of fin 3 is 1.5mm-15mm, the overall diameter at needle stand step 5 places is greater than sheath 6 intracavity diameter 0.15mm-3mm, the overall diameter at needle stand step 5 places is greater than the total length 0.15mm-3mm of line between fin 6 and the fin 6, the thickness of described needle stand position limiting convex ring 4 is 0.1mm-1.8mm, the external diameter of needle stand position limiting convex ring 4 is greater than the overall diameter 0.13mm-20mm at needle stand step 5 places, the external diameter of needle stand position limiting convex ring 4 is greater than the needle stand overall diameter 0.1mm-0.8mm of needle stand position limiting convex ring 4 bottoms, the upper surface of described step 5 is 0.5mm-16mm to the distance between needle stand position limiting convex ring 4 upper surfaces, and described needle stand position limiting convex ring 4 upper surfaces are 2mm-15mm to the distance of needle stand 2 bottoms.

In the specific implementation, as shown in Figure 4, in assembling process, the first step, sheath 6 is enclosed within the needle stand outside from top to bottom, prop up the upper surface of step until the lower surface of the sheath bulge loop of sheath, as shown in Figure 5, second step, with pack into the from top to bottom tube neck inner chamber of injector cartridge of the needle stand that is with sheath, prop up the tube neck top of injector cartridge until the lower surface of the sheath bulge loop of sheath, as shown in Figure 6, finish the assembling of safety injector syringe needle part.

Claims (4)

1, a kind of needle head structure of safety injector, it mainly comprises needle tubing (1), needle tubing (1) is arranged in the needle stand (2), it is characterized in that: described needle stand (2) inner chamber hollow, needle stand (2) is made of the upper and lower, form a step (5) between the upper and lower of needle stand (2), the outer wall place on needle stand (2) top is provided with four fins (3), become the angle of 45 degree between the every fin (3), symmetrical in twos between fin (3) and the fin (3), needle stand (2) bottom outer wall is provided with needle stand position limiting convex ring (4), the side of fin (3) is fixed in the outer wall on needle stand (2) top, the upper surface of step (5) is fixed on the base of fin (3), the total length of line is 3mm-9mm between described fin (3) and the fin (3), the length of fin (3) is 1.5mm-15mm, the upper surface of step (5) is 0.5mm-16mm to the distance between needle stand position limiting convex ring (4) upper surface, described needle stand position limiting convex ring (4) upper surface is 2mm-15mm to the distance of needle stand (2) bottom, the thickness of described needle stand position limiting convex ring (4) is 0.1mm-1.8mm, overall diameter 0.13mm-20mm that the external diameter of needle stand position limiting convex ring (4) is located greater than needle stand step (5), the external diameter of needle stand position limiting convex ring (4) is greater than the needle stand overall diameter 0.1mm-0.8mm of needle stand position limiting convex ring (4) bottom.

2, the needle head structure of a kind of safety injector according to claim 1, it is characterized in that: the outer sheath (6) that is socketed with of described needle stand (2), the inner chamber hollow of sheath (6), the interior diameter of its inner chamber are between 3mm-9mm, and the bottom of sheath (6) outer wall is provided with sheath bulge loop (7).

3, the needle head structure of a kind of safety injector according to claim 1, it is characterized in that: the overall diameter that needle stand step (5) is located is greater than sheath (6) intracavity diameter 0.15mm-3mm, and the overall diameter that needle stand step (5) is located is greater than the total length 0.15mm-3mm of line between fin (6) and the fin (6).

4, the needle head structure of a kind of safety injector according to claim 1, it is characterized in that: 8, the needle head structure of a kind of safety injector according to claim 1 is characterized in that: the lower surface of described sheath bulge loop (7) is parallel with step (5) upper surface.

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