CN101318041B

CN101318041B - Safety injector with injection needle automatically deflecting when shrinking

Info

Publication number: CN101318041B
Application number: CN2008100226144A
Authority: CN
Inventors: 庄明忠
Original assignee: OTTER (CHINA) MEDICAL TECHNOLOGY Ltd
Current assignee: Wuxi Yushou Medical Apparatus Co., Ltd.
Priority date: 2008-07-16
Filing date: 2008-07-16
Publication date: 2010-04-21
Anticipated expiration: 2028-07-16
Also published as: CN101318041A

Abstract

The invention relates to a medical injector, in particular to a safe injector in which an entry needle can deflect automatically when retraction. According to the proposal provided by the invention, the safe injector in which the pumping needle can deflect automatically when retraction comprises: a needle cylinder and a neilsbed, the neilsbed is arranged at the front part of the needle cylinder; the needle cylinder comprises a needle cylinder part located at the rear part of the needle cylinder and a needle guard part located at the front part of the needle cylinder; the front part in the inner of the needle cylinder part contains an inner cavity of the needle cylinder used for containing liquid medicine; a shoulder part which is arranged between the needle cylinder part and the needle guard part; and a rear flange of the needle cylinder which is located at the rear part of the needle cylinder; the characteristics are that: a first lug boss is formed which is bulgy and is formed on the front end wall in which a front groove is formed, and a second lug boss which is bulgy is arranged on the rear end wall in which a front groove is formed and the second lug boss is arranged on the diagonal line facing the first lug boss; after the T-shape tail part of the neilsbed enters into the front groove through the bottom of the leading port, the first lug boss and the second lug boss produce strength to force the T-shape tail part to decline; one-off use of the injector shall be ensured, thus avoiding across infection and injuring other persons accidentally.

Description

Entry needle is the safety injector of automatic deflection when interior contracting

Technical field

The present invention relates to a kind of injector for medical purpose, specifically a kind of entry needle is the safety injector of automatic deflection when interior contracting.

Background technology

Traditional syringe is after injection finishes, when if needle point is stained with the blood of suffering from infectiousness or dangerous symptom sufferer, medical worker, nurse and cleanup crew have infected danger, and during even without disease carrying germ, the needle point of entry needle also has the danger of stabbing other people.

Summary of the invention

The objective of the invention is to design a kind of entry needle is automatic deflection when interior contracting safety injector, with the situation of avoiding that cross infection takes place and accidentally injuring other people.

According to technical scheme provided by the invention, described entry needle is automatic deflection when interior contracting safety injector comprises: syringe and needle stand, and described needle stand is installed on the front portion of this syringe; Described syringe comprises the syringe portion that is positioned at the syringe rear portion and is positioned at the forward needle guard of syringe portion; A syringe inner chamber that is used for the dressing medicinal liquid is contained in front portion in the described syringe portion; And the shoulder between syringe portion and needle guard portion; And be positioned at flange behind the syringe at syringe rear portion;

Described needle stand comprises a passage, and is arranged at the sticking needle tray at this passage front opening place, with the T type afterbody that is positioned at the needle stand rearward end; One piston is slidingly connected in the syringe portion; The front end of described piston is provided with a guiding port, has a forward recess that is communicated with guiding port in the piston of guiding port back; Afterbody at piston is provided with rearward recess, and the front end of core bar is connected in the rearward recess of piston;

It is characterized in that: described guiding port shrinks to forward recess gradually from the front end face of piston, and the bottom opening that makes guiding port is less than T type afterbody; On the front bulkhead that forms forward recess, form first boss that protrudes, on the aft bulkhead that forms forward recess, in the face of second boss of protrusion is set on the diagonal of first boss 1, after the bottom opening of the T of needle stand type afterbody by guiding port entered forward recess, first boss and second boss produced the power that forces needle stand to tilt to T type afterbody.

The front end face of described T type afterbody is annular plane or annular concave surface; Described annular concave surface be meant this loop concave from the edge to central authorities gradually to the back concave end of T type afterbody; The rear end face of described T type afterbody is the conical surface.Described first boss is outstanding to the back extreme direction of piston; Described second boss is given prominence to the direction of first boss or to the preceding extreme direction of piston.Be provided for holding the cavity of needle stand in needle guard portion, described needle stand is located in before injection in the described cavity, and between the inwall of the outer wall of needle stand and needle guard portion sealing member is set.

Passage in the described needle stand comprises and is arranged at the forward vertical passage of needle stand, is arranged on the interconnection at needle stand middle part; Gapped between the rear portion of needle stand and needle guard portion, described vertical passage, interconnection, gap and syringe inner chamber are communicated with successively.In the passage of needle stand, entry needle is arranged, in sticking needle tray, fill and be used for entry needle is bonded in colloid in the needle stand.The transverse section of described needle guard portion is less than the transverse section of described syringe portion.The rear end of syringe portion is stretched out in the rear end of core bar, in the rearward end of core bar handle is set.A longitudinal axis is defined in feeling resentful of forward recess, the dead in line of this longitudinal axis and syringe or be parallel to each other.The mating surface of needle stand and needle guard portion is the conical surface, and the front end section of this conical surface is less than the rear end section.

Advantage of the present invention is: the piston processing technology is simple and easy, the deflection of entry needle is not the deflection generation according to internal piston groove dress guiding port, but produce according to the symmetry extruding of two boss, its groove central shaft and the syringe axis heart one straight line or parallel, Mould Machining has only a center.The Piston mould of traditional deflection then has two central points is arranged on out-of-line or the parallel lines, the Mould Machining difficulty, in rubber molding demoulding difficulty, easily drawing crack, with after the coupling of needle stand T type afterbody in the power that contracts less, according to design of the present invention, in the power that contracts bigger, coupling power is less, and its piston cost of manufacture is lower.

Description of drawings

Fig. 1 is the whole cutaway view of syringe.

Fig. 2 is the state diagram after core bar head and T type afterbody and the piston coupling.

Contract in the being deflected condition sketch map of back entry needle of Fig. 3.

Fig. 4 is the state diagram before core bar head and T type afterbody and the piston coupling.

Fig. 5 is the needle stand structure chart.

Fig. 6 is piston structure figure.

Fig. 7 is syringe cylinder structure figure.

The specific embodiment

See also Fig. 4, described entry needle is automatic deflection when interior contracting safety injector comprises: syringe 1 and needle stand 2, and described needle stand 2 is installed on the front portion of this syringe 1; Described syringe 1 comprises the syringe portion 4 that is positioned at syringe 1 rear portion and is positioned at the forward needle guard of syringe 1 portion 3; A syringe inner chamber 5 that is used for the dressing medicinal liquid is contained in front portions in the described syringe portion 4; And the shoulder 7 between syringe portion 4 and needle guard portion 3; And be positioned at flange 8 behind the syringe at syringe 1 rear portion; Described needle stand 2 comprises a passage, and is arranged at the sticking needle tray 9 at this passage front opening place, with the T type afterbody 10 that is positioned at needle stand 2 rearward end; One piston 11 is slidingly connected in the syringe portion 4; The front end of described piston 11 is provided with a guiding port 15, has a forward recess 12 that is communicated with guiding port 15 in the piston 11 of guiding port 15 back; Afterbody at piston 11 is provided with rearward recess 20, and the front end 19 of core bar 18 is connected in the rearward recess 20 of piston 11; Described shoulder 7 can carry out spacing to piston 11 when piston 11 moves forward.

Described guiding port 15 shrinks to forward recess 12 gradually from the front end face of piston 11, the bottom opening that makes guiding port 15 is less than T type afterbody 10, so that after T type afterbody 10 embeds in the forward recess 12, the less opening in guiding port 15 bottoms can block T type afterbody 10, and T type afterbody 10 can't be separated with piston 11; On the front bulkhead that forms forward recess 12, form first boss 16 that protrudes, on the aft bulkhead that forms forward recess 12, in the face of second boss 17 of protrusion is set on the diagonal of first boss 16, after the bottom opening of the T of needle stand 2 type afterbody 10 by guiding port 15 entered forward recess 12,

first boss

16 and 17 pairs of T types of second boss afterbody 10 produced the power that forces needle stand 2 to tilt.

The front end face of described T type afterbody 10 is annular plane or annular concave surface; When described front end face is annular concave surface, this loop concave from the edge to central authorities gradually to the back concave end of T type afterbody 10; The rear end face of described T type afterbody 10 is the conical surface, so that T type afterbody 10 embeds in guiding port 15 and the forward recess 12.

Described first boss 16 is outstanding to the back extreme direction of piston 11; Described second boss 17 is given prominence to the direction of first boss 16 or to the preceding extreme direction of piston 11.When T type afterbody 10 was embedded in the forward recess 12, the part front surface 27 of T type afterbody 10 was withstood by first boss 16, and 28 of the part back bevels of T type afterbody 10 are withstood by second boss 17, and two bursts of power that produced force needle stand 2 to tilt.Be provided for holding the cavity of needle stand 2 in needle guard portion 3, described needle stand 2 is located in before injection in the described cavity, and between the inwall of the outer wall of needle stand 2 and needle guard portion 3 sealing member is set.Needle stand 2 then is brought in the syringe portion 4 after injection, and can't enter once more in the needle guard portion 3 because of inclination.Passages in the described needle stand 2 comprise and are arranged at needle stand 2 forward vertical passages 24, are arranged on the interconnection 25 at needle stand 2 middle parts; Gapped 26 between the rear portion of needle stand 2 and needle guard portion 3, described vertical passage 24, interconnection 25, gap 26 and syringe inner chamber 5 are communicated with successively.During injection, the medicinal liquid in the syringe inner chamber 5 through gap 26, interconnection 25, vertical passage 24 enter in the entry needle 22.

Entry needle 22 is arranged in the passage of needle stand 2.Filling is used for entry needle 22 is bonded in colloid in the needle stand 2 in sticking needle tray 9.When needs are injected, earlier entry needle 22 is inserted and be equipped with in the container of injection, pull back core bar 18, driving piston 11 moves backward, the interior injection of container is inhaled in the syringe inner chamber 5 by entry needle 22, and then entry needle 22 is extracted, and promote core bar 18 again in the insertion human body, drive piston 11 and move forward, injection is injected in the human body by entry needle 22.The transverse section of described needle guard portion 3 is less than the transverse section of described syringe portion 4.The rear end of syringe portion 4 is stretched out in the rear end of core bar 18, in the rearward end of core bar 18 handle is set.A longitudinal axis 14 is defined in feeling resentful of forward recess 12, and this longitudinal axis 14 overlaps with the axis 6 of syringe 1 or is parallel to each other.Needle stand 2 is the conical surface with the mating surface of needle guard portion 3, the front end section of this conical surface is less than the rear end section, needle stand 2 can not deviate from from needle guard portion 3 because of the extruding of piston 11, but can when piston 11 retractions, retreat together, make needle stand 2 in entry needle 22 is withdrawn into syringe inner ring 5.

When injection, middle finger and forefinger are buckled in behind the syringe on the flange 8, thumb is buckled on the handle of core bar 18 rearward end, use thumb pressing core bar 18 then, promoting core bar 18 moves forward, in the core bar head 19 syringe portions 4 of drive piston 11 of core bar 18 front ends, move forward at syringe 1, extruding has been inhaled into the medicinal liquid in the syringe inner chamber 5, make medicinal liquid through the annular gap 26 of 3 in needle stand 2 and needle guard portion, be arranged at that interconnections 25 and vertical passage 24 enter entry needle 22 in the needle stand 2, in entry needle 22 injection human bodies.The process herb liquid of constantly being passed at piston 11 is slowly injected in the human body.When the guiding port 15 of piston 11 is run into the T type afterbody 10 of needle stand 2 lower ends, continue to promote core bar 18, make T type afterbody 10 pass through the shrinking zone of guiding port 15 bottoms gradually, insert the forward recess 12 of piston 11, when piston 11 moves forward to the inwall of running into shoulder 7, medicinal liquid is all extruded in syringe inner chamber 5, is injected in the human body; Simultaneously, T type afterbody 10 has inserted in the forward recess 12 fully, T type afterbody 10 and forward recess 12 couplings are linked together, effect owing to first boss 16 on the front bulkhead of the forward recess 12 that is diagonal layout (being centrosymmetry) and second boss 17 on the aft bulkhead, make the front surface 27 of the boss 16 compressing T type afterbodys 10 of winning, the diagonal back bevel 28 of 17 extruding of second boss T type afterbody 10 causes two bursts of power that force 19 run-off the straights of T type afterbody to T type afterbody 19.After entry needle 22 is extracted in people's the human body, pull back core bar 18, drive pistons 11 by core bar head 19 and move backward, drive T type afterbodys 10 by piston 11 again and move backward, and drive needle stands 2 and entry needle 22 moves together backward by T type afterbody 10.When core bar 18 drives pistons 11 and needle stand 2 and moves to entry needle 22 backward all be withdrawn in the syringe inner chamber 5 in syringe 1, because above-mentioned two bursts of power mutual extrusion effect, needle stand 2 is tilted together with entry needle 22, the needle point of entry needle 22 leans against on the inwall of syringe portion 4 because of inclination, make the needle point of this entry needle 22 because of being blocked the needle guard portion 3 that can't stretch out syringe 1 once more by shoulder 7, thus reach can only disposable this syringe of use purpose.

Claims

1. an entry needle is the safety injector of automatic deflection when interior contracting, and comprises; Syringe (1) and needle stand (2), described needle stand (2) is installed on the front portion of this syringe (1);

Described syringe (1) comprises the syringe portion (4) that is positioned at syringe (1) rear portion and is positioned at syringe (1) forward needle guard portion (3);

A syringe inner chamber (5) that is used for the dressing medicinal liquid is contained in front portion in the described syringe portion (4); And the shoulder (7) between syringe portion (4) and needle guard portion (3); And be positioned at flange (8) behind the syringe at syringe (1) rear portion;

Described needle stand (2) comprises a passage, and is arranged at the sticking needle tray (9) at this passage front opening place, with the T type afterbody (10) that is positioned at needle stand (2) rearward end;

One piston (11) is slidingly connected in the syringe portion (4); The front end of described piston (11) is provided with a guiding port (15), has a forward recess (12) that is communicated with guiding port (15) in the piston (11) of guiding port (15) back;

Afterbody at piston (11) is provided with rearward recess (20), and the front end (19) of core bar (18) is connected in the rearward recess (20) of piston (11);

It is characterized in that: described guiding port (15) shrinks to forward recess (12) gradually from the front end face of piston (11), and the bottom opening that makes guiding port (15) is less than T type afterbody (10); On the front bulkhead that forms forward recess (12), form first boss (16) that protrudes, on the aft bulkhead that forms forward recess (12), in the face of second boss (17) of protrusion is set on the diagonal of first boss (16), after the T type afterbody (10) of needle stand (2) bottom opening by guiding port (15) entered forward recess (12), first boss (16) produced the power that forces needle stand (2) to tilt with second boss (17) to T type afterbody (10).

2. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, and it is characterized in that: the front end face of described T type afterbody (10) is annular plane or annular concave surface; Described annular concave surface be meant this loop concave from the edge to central authorities gradually to the back concave end of T type afterbody (10); The rear end face of described T type afterbody (10) is the conical surface.

3. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, it is characterized in that: described first boss (16) is outstanding to the back extreme direction of piston (11); Described second boss (17) is given prominence to the direction of first boss (16) or to the preceding extreme direction of piston (11).

4. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, it is characterized in that: the cavity that in needle guard portion (3), is provided for holding needle stand (2), described needle stand (2) is located in before injection in the described cavity, and between the inwall of the outer wall of needle stand (2) and needle guard portion (3) sealing member is set.

5. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, it is characterized in that: the passage in the described needle stand (2) comprises and is arranged at the forward vertical passage of needle stand (2) (24), is arranged on the interconnection (25) at needle stand (2) middle part; Between the rear portion of needle stand (2) and needle guard portion (3) gapped (26), described vertical passage (24), interconnection (25), gap (26) and syringe inner chamber (5) are communicated with successively.

6. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, it is characterized in that: entry needle (22) is arranged in the passage of needle stand (2), and filling is used for entry needle (22) is bonded in colloid in the needle stand (2) in sticking needle tray (9).

7. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, and it is characterized in that: the transverse section of described needle guard portion (3) is less than the transverse section of described syringe portion (4).

8. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, and it is characterized in that: the rear end of syringe portion (4) is stretched out in the rear end of core bar (18), in the rearward end of core bar (18) handle is set.

9. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, and it is characterized in that: a longitudinal axis (14) is defined in feeling resentful of forward recess (12), and this longitudinal axis (14) overlaps with the axis (6) of syringe (1) or is parallel to each other.

10. entry needle is the safety injector of automatic deflection when interior contracting according to claim 1, it is characterized in that: needle stand (2) is the conical surface with the mating surface of needle guard portion (3), and the front end section of this conical surface is less than the rear end section.