WO2009105960A1

WO2009105960A1 - Safety self-destruction syringe

Info

Publication number: WO2009105960A1
Application number: PCT/CN2009/000182
Authority: WO
Inventors: 周令刚
Original assignee: Chou Ling-Kong
Priority date: 2008-02-25
Filing date: 2009-02-23
Publication date: 2009-09-03
Also published as: CN201194975Y

Abstract

A safety self-destruction syringe includes a tubular housing (1). The housing (1) is provided with a closing plug (7) therein hermetically and slideably connect with it, and a movable needle seat (2) therein hermetically plug-contacted with it. There is a needle head mounting portion (3) on the movable needle seat (2). The cavity between the opposite ends of the movable needle seat (2) and the closing plug (7) forms an injection liquid storing cavity. The movable needle seat (2) and the inside of the needle head mounting portion (3) are communicated with the injection liquid storing cavity. A projection (12) on the movable needle seat (2) and a fastening lug (13) on the housing (1) are lapped and matched mutually. A hook (8) extending into the injection liquid storing cacity is fixed on the movable needle seat (2). A contractive inclined surface (19) of the hook (8) is fixed on the closing plug (7). A biasing bore (20) is located under the contractive inclined surface (19), and the axis of the the biasing bore (20) is deflected from the axis of the housing (1). The closing plug (7) is provided with a clamping part (21), which connects the closing plug (7) to the hook (8) integrally. The tube diameter of the housing (1) at the side of the hook (8) is greater than the outer diameter of the movable needle seat (2), and the housing (1) at the other side of hook (8) restricts the movable needle seat (2) therein.

Description

Safe self-destructing syringe

The utility model relates to the technical field of medical instruments, in particular to a safe self-destructing syringe. Background technique

At present, there are many types of self-destructing syringes, and there are many safety syringes, but there are not many syringes that can self-destruct and achieve safety effects. The structure of a general safety syringe is mostly in the form of a retracting needle. This structure has technically difficult problems to be solved, that is, the force for preventing the needle from being pulled when the needle is inserted must be greater than the force for manually (automatically) retracting the needle. . If the force of positioning (preventing the needle is removed) is large, the needle can be prevented from being withdrawn, but the force of retracting the needle will also become larger, and it will be larger, which will eventually lead to safety hazards; if positioning is set (to prevent withdrawal) The force is small, the safety factor will be high, but the force to prevent the needle withdrawal is also small. According to the requirements of use, the force to prevent the needle from being retracted should be large. It is better to exceed 50N. The force for retracting the needle should be small, preferably less than 20N, which is convenient for one-hand operation. This force is determined by the fixed way of the movable needle seat. The existing safety syringe is easy to prevent the retreating force of the needle tip when the needle is clinically inserted, and the needle tip is retracted into the syringe casing itself, and the liquid medicine leaks all over the patient body, causing a medical accident. It can be seen that existing safety syringes still have many shortcomings and deficiencies, and further modifications to existing safety syringes are still needed.

Summary of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a large force for preventing the needle from being retracted, a small force for retracting the needle, a small force of the mechanism for retracting the sealing plug and the movable needle holder, and a medical staff and The patient's discomfort is small, and the needle tip is retracted into the syringe casing and is deflected and cannot be pushed out again to achieve a safe self-destructing syringe.

According to the technical solution provided by the utility model, a sealing plug which is sealed and slidably connected is arranged in the outer sleeve, and a movable needle seat sealed and inserted with the movable needle seat is arranged in the outer sleeve, and the movable needle seat is provided with a needle mounting portion, the movable needle seat and the movable needle seat The cavity between the opposite ends of the sealing plug forms an injection liquid storage cavity, and the movable needle seat and the needle mounting portion communicate with the injection liquid storage cavity, and the movable needle seat and the outer sleeve are provided with overlapping protrusions a locking portion extending into the injection liquid storage chamber is provided on the movable needle seat, and a tightening inclined surface of the hook is arranged on the sealing plug, and a deflection hole is arranged below the tightening inclined surface, and the deflection hole is provided The axis is obliquely disposed with the axis of the outer sleeve, and the sealing plug is provided with a fastening portion that integrally connects the sealing plug and the hook, and the diameter of the outer casing of the hook is larger than the outer diameter of the movable needle seat, and the outer jacket of the outer side of the hook Constrain the active hub to it.

A lengthwise expansion joint is formed on the movable needle seat on the upper part of the boss. The expansion joint is annular, and its width is gradually contracted from the outside to the inside. At the inner end portion of the expansion joint, a circular arc hole which is integrally connected with the width and larger than the expansion joint is provided. A core rod extending out of the jacket is attached to the sealing plug.

The hook is a two-plate body integrally connected with the movable needle seat and extending into the injection liquid storage cavity body, and the lower end portion of the plate body is provided with an outwardly protruding protrusion, which is provided on the protrusion A guiding bevel that fits the beveled surface. The fastening portion is a blind hole that matches the shape of the protrusion on the hook, and the sealing plug above the fastening portion is provided with a limiting body for preventing the protrusion on the hook from slipping out.

The needle mounting portion is tapered and has a taper of 6:100. The outer casing has a round tubular shape, and the inner wall is evenly provided with an inner circular rack, and the movable needle seat is provided with an outer circular rack which meshes with the inner circular rack. Bottom of the inner rack The end is provided with a guiding angle. An annular groove is arranged on the movable needle seat above the expansion joint, and an elastic 'Ό' type sealing ring is arranged in the annular groove, and the "0" type sealing ring has an interference fit with the annular groove .

When the utility model is used, the force for preventing the needle is large, the force for retracting the needle is small, the biting force of the mechanism for pulling back the sealing plug and the movable needle seat is small, the discomfort of the medical staff and the patient is small, and the needle tip is retracted after the syringe casing is If it is skewed, it cannot be pushed out again, and it is completely safe and self-destructive.

DRAWINGS

Figure 1 is an overall structural view of the present invention.

Figure 2 is another structural view of the present invention. The present invention will be further described below in conjunction with the specific drawings and embodiments.

As shown in the figure, a sealing plug 7 is provided in the outer casing 1 which is sealed and slidably connected thereto. The outer casing 1 is provided with a movable needle holder 2 which is sealed and inserted therein. The movable needle base 2 is provided with a needle mounting portion 3, a movable needle The cavity between the seat 2 and the opposite end of the sealing plug 7 forms an injection liquid storage cavity, and the movable needle holder 2 and the needle mounting portion 3 communicate with the injection liquid storage cavity, and are disposed on the movable needle holder 2 and the outer casing 1. There is a convex portion 12 and a card table 13 which are overlapped with each other, and the movable needle base 2 is provided with a hook 8 extending into the injection liquid storage cavity body, and a tightening inclined surface 19 of the hook 8 is provided on the sealing plug, tightening A deflection hole 20 is disposed below the inclined surface 19, the axis of the deflection hole 20 is obliquely disposed with the axis of the outer casing 1, and a fastening portion for integrally connecting the sealing plug 7 and the hook 8 is provided on the sealing plug 7. 21, the diameter of the outer casing 1 on the side of the hook 8 is larger than the outer diameter of the movable needle seat 2, and the outer casing 1 on the other side of the hook 8 restrains the movable needle holder 2 therein: so that the movable needle holder 2 is only in the outer casing 1 Can move in one direction, that is, move downwards, but not upwards, so as to be light Loose completes the entire injection process.

A expansion joint 10 is formed on the movable needle seat 2 at the upper portion of the boss portion 12. The expansion joint 10 is annular and has a width which gradually contracts from the outside to the inside. The inner end portion of the expansion joint 10 is integrally connected thereto. The arc hole 11 having a width larger than the expansion joint 10 at the place. An annular groove 15 is disposed on the movable needle holder 2 above the expansion joint 10, and an elastic "0" type sealing ring 5 is provided in the annular groove 15, and the "Ο" type sealing ring 5 and the ring are provided. The groove 15 has an interference fit. - A core rod 6 projecting from the outer casing 1 is attached to the sealing plug 7. The hook 8 is a two-plate body integrally connected with the movable needle base 2 and extending into the injection liquid storage cavity. The lower end portion of the plate body is provided with an outwardly protruding protrusion, and the protrusion is provided on the protrusion A guiding bevel 22 that cooperates with the tightening ramp 19. The fastening portion 21 is a blind hole that matches the shape of the protrusion on the hook 8. The sealing plug 7 above the fastening portion 21 is provided with a limiting body 23 for preventing the protrusion on the hook 8 from slipping out. .

The needle mounting portion 3 is tapered and has a taper of 6:100. At this time, the needle mounting portion 3 can be inserted into the currently-used injection needle; and the injection needle can be directly installed in the hole of the needle mounting portion 3. At this time, the outer wall of the needle mounting portion 3 may have any shape. The outer casing 1 has a circular tubular shape, and an inner circular rack is evenly disposed on the inner wall thereof. The movable needle base 2 is provided with an outer cylindrical rack 17 which is engaged with the inner circular rack 16. The bottom end portion of the inner bobbin 16 is provided with a guide angle 18.

As shown in FIG. 1, a movable needle holder 2 is disposed in the top neck of the outer casing 1. The center of the top end of the movable needle holder 2 is provided with a 6:100 needle mounting portion 3 for arranging a universal injection needle, and a half of the movable needle holder 2 A "Ο" type seal ring 5 is arranged in the waist, a core rod 6 is arranged in the outer sleeve 1, and a rubber stopper 7 is connected to the end of the core rod 6. Under the movable needle seat 2 The end is provided with a conical hook 8, and the conical hook 8 is formed into two lobes by the opening 9, and the opening is deep enough to be flush with the lower line position of the expansion joint 10, and the conical hook 8 is upturned, at the needle seat 'Ό' At the lower position of the seal ring 5, the laterally disposed expansion joint 10 has an annular shape as a whole, and the bottom end of the expansion joint 10 is provided with a circular arc hole 11, and the movable needle seat 2 at the lower portion of the expansion joint 10 is provided with two convex portions 12 , stuck in the ring card 13 in the top neck of the outer casing 1 , the top of the sealing plug 7 is provided with a plastic plug inner hole 14 similar in shape to the tapered hook 8 , the rubber inner hole 14 is tightened by the inclined surface 19 , The inclined hole 20 is formed by a blind hole provided below, and the axis of the skew hole 20 is inclined by 1° to 15° with the axis of the outer casing 1, and the "0" type seal ring 5 is installed in the annular groove 15 of the movable needle holder 2. At the upper end of the neck of the outer casing 1 and the upper end of the movable needle holder 2, eighteen inner circular racks 16 and six outer cylindrical racks 17 are provided.

In a specific implementation, the "0" type seal ring 5 is used for sealing the top neck of the outer casing 1 and the movable needle seat 2, and the outer circumference of the inner circumference of the cylinder neck and the circular rectangular groove 15 on the movable needle holder 2 are both The interference fit is used so that the movable needle holder 2 does not leak after assembly.

The eighteen vertical inner cylindrical racks 16 on the upper end of the neck inner cavity of the outer casing 1 and the six outer cylindrical racks 17 on the movable needle base 2 are equally divided on the circumference, and have the same size, just enough to be stuck to each other. Moreover, they are all provided with a guiding angle 18, which can be easily assembled in any direction of 360° during assembly, and the movable needle holder 2 cannot be rotated in the neck of the outer casing 1 after being stuck.

The two expansion joints 10 on the lower side of the annular groove 15 of the movable needle holder 2 and the two hooks 12 on the lower side and the ring-shaped insertion table 13 in the top of the outer casing 1 are combined, which can prevent the movable needle holder 2 from being Retreat, increase the anti-retraction force, 'Because the axial force of the movable needle seat 2 is retracted, the two convex portions 12 are all decomposed into an outward tension, which will become tighter and tighter. Increase.

When the safety syringe is injected with the liquid medicine, the two-legged taper 8 on the movable needle seat 2 is deformed by the tightening slope 19 and slowly gathers inwardly, and the movable needle holder 2 below the expansion joint 10 is also deformed until The hook 8 is completely received into the blind hole below the deflection hole 20, and during the blind hole of the hook 8 being received under the deflection hole 20, the boss 12 and the ring card 13 are loosened, and then the core rod is pulled. 6, the movable needle holder 1 can be easily retracted into the outer casing 1 by the universal injection needle, since the axis of the deflection hole 20 is inclined by 1 to 15° from the axis of the outer casing 1, so that the vertical shape on the hook 8 The plate body is retracted during the retraction of the movable needle holder 2 into the outer casing 1 to cause deflection in the outer casing 1, thereby causing the movable needle base 2 to be deflected as a whole, so that the universal injection needle mounted on the needle mounting portion 3 is also Deviating from the axis of the shaft, the jacket 1 can no longer be pushed, and the medical staff and the cleaning staff will not be stabbed again, achieving self-destruction and safety functions.

In addition, the hooks of the hooks 8 are not necessarily limited to project outwardly, and may be designed to protrude inwardly. At this time, as long as a tilted upwardly extending rod 24 is disposed in the blind hole below the deflecting hole 20, The slanting angle of the shank 24 is the same as that of the yoke 20, and two outwardly extending limiting ribs 225 are disposed on the shank 24 relative to the hooks of the hook 8. The limiting ribs 25 are provided with downward and outward projections. The guiding slope 26 can be as shown in FIG. 2 .

Claims

Rights request

A safe self-destructing syringe comprising a tubular outer casing (1), a sealing plug (7) sealed and slidably connected thereto in the outer casing (1), and a movable needle sealed and connected thereto is arranged in the outer casing (1) a seat (2), a needle mounting portion (3) is provided on the movable needle seat (2), and a cavity between the movable needle seat (2) and the opposite end of the sealing plug (7) forms an injection liquid storage chamber, and the movable body The needle seat (2) and the needle mounting portion (3) are internally connected to the injection liquid storage cavity, and the movable needle seat (2) and the outer casing (1) are provided with a convex portion (12) and a card seat which are overlapped with each other. (13), characterized in that: the movable needle seat (2) is provided with a hook (8) extending into the injection liquid storage chamber body, and a tightening inclined surface (19) is provided on the sealing plug (7) , tightening the slope

(19) is provided with a deflection hole (20), the axis of the deflection hole (20) is inclined with respect to the axis of the outer casing (1), and a sealing plug is provided on the sealing plug (7). ) The engaging portion (21) integrally connected with the hook (8), the outer diameter of the outer casing (1) on the side of the hook (8) is larger than the outer diameter of the movable needle seat (2), and the other side of the hook (8) The outer sleeve (1) constrains the movable needle holder (2).

2. A self-destructing syringe according to claim 1, wherein: a length of expansion joint (10) is formed in the movable needle holder (2) at the upper portion of the boss (12).

A safe self-destructing syringe according to claim 2, wherein: the expansion joint (10) is annular, and its width gradually contracts from the outside to the inside, and is connected to the inner end of the expansion joint (10). An arc hole (11) that is integral and wider than the expansion joint (10).

4. A self-destructing syringe according to claim 1, characterized in that: a sealing rod (7) is attached to the core rod (6) of the outer casing (1).

5. The safe self-destructing syringe according to claim 1, wherein: the hook (8) is a two-plate body integrally connected with the movable needle seat (2) and extending into the injection liquid storage chamber, the plate The lower end of the body is provided with an outwardly projecting protrusion, and a guiding bevel (22) is provided on the protrusion to cooperate with the tightening bevel (19).

6. The safe self-destructing syringe according to claim 1, wherein: the fastening portion (21) is a blind hole that conforms to the shape of the protrusion on the hook (8), and is at the fastening portion (21). The upper sealing plug (7) is provided with a stopper (23) for preventing the projection on the hook (8) from slipping out.

7. The safe self-destructing syringe of claim 1 wherein: said needle mounting portion (3) is tapered and has a taper of 6:100.

8. The safety self-destructing syringe according to claim 1, wherein: the outer casing (1.) is a circular tubular shape, and an inner circular rack (16) is evenly disposed on the inner wall thereof, and the movable needle base (2) is provided with The outer sprocket (16) with the inner sprocket (16) engaged.

9. The self-destructing syringe of claim 1 wherein: the bottom end of the inner sprocket (16) is provided with a guide angle (18).

10. A self-destructing syringe according to claim 2 or 3, wherein: the movable needle seat (2) above the expansion joint (10) is provided with an annular groove (15) in which the annular recess is provided. An elastic "O" type seal ring (5) is provided in the groove (15), and the "O" type seal ring (5) has an interference fit with the annular groove (15).