WO2009111930A1 - Safety injector - Google Patents

Abstract

A safety injector, its needle is formed of an outside pinhead base (5) and an inside pinhead base (6). A pull-back pole (7) is provided at the end of a core rod (3), the pull-back pole (7) is projected from the surface of a rubber plug (2). The upper part of the inside pinhead base (6) is column, the down part of the inside pinhead base (6) is formed of pieces (8). One end of the pieces (8) is fixed on the end of said column, another end of the two pieces (8) is formed of a cone-shaped configuration, and the cone-shaped configuration can be close-shaped or open-shaped.

Description

 Safety syringe

 Technical field:

 The present invention relates to the technical field of medical devices, and more particularly to a safety syringe, and more particularly to a mechanical connection structure thereof.

 Background technique:

 Comparative document 1, patent number: ZL200420092408. 8, publication number: CN2724733, patentee: Hengwang Biochemical Technology Co., Ltd., disclosed in this case a "back pull safety syringe", which discloses a pullback type The safety syringe comprises a needle, a syringe and a plunger. The bottom of the needle is provided with a first connecting portion. A needle socket is formed above the syringe, and an injection space is arranged below. The needle is combined with a predetermined bonding force. On the needle socket, the plunger can be pushed under the syringe into the injection space in the syringe, wherein the piston is made of elastic material, has a hollow space, and is shaped to be easily compressed and restored by force. Causing the piston upwardly in the injection space of the syringe until the top surface of the piston contacts the top of the inner wall of the injection space, and the first engagement portion and the second engagement portion have not been combined in this condition, and when a force is applied to the default value In the above, the piston can be deformed to a certain extent, and when the second connecting portion protrudes upward and away from the top surface of the piston, the second connecting portion starts and the first The engagement portions are joined so that the needle can be pulled back out of the needle hub to the inside of the syringe.

 Comparative Document 2, Application No.: 01113404. 6, Applicant: Qian Yitian; Lu Yimin, in this case, a "needle retracting type safety syringe" is disclosed, which discloses a needle retracting type safety syringe. The needle body, the needle seat, the needle body collecting tube, the needle barrel and the plunger are characterized in that: the needle body is composed of a steel needle and a plastic connecting body; the needle seat has two channels of liquid flow holes, around the needle body hole A plurality of small body grooves are closely matched with the small body on the needle body, and have a fixed needle body and a retracting action after the needle body is broken; a circular rotating disk with two liquid flow holes is arranged at the front end of the needle body collecting tube. The center of the syringe is a needle retracting hole; the front end of the syringe has a syringe front disc, and the tail end has a syringe cover; the plunger has a pusher plate at the front end, a plunger handle at the rear end, and a sleeve at the center, the center sleeve There are a pair of flank on both sides.

Comparative Document 3, Patent No.: ZL01269007. 4, Publication No.: CN2518520, Patentee: Shandong Weigao Group Medical Polymer Products Co., Ltd., in this case, a "self-destructing safety syringe" is disclosed, which discloses a The self-destructing safety syringe comprises a jacket, a needle seat, a sealing ring, a piston and a core rod. The front end of the jacket has a cylindrical hole, and the inner wall of the cylindrical hole is axially provided with a plurality of strip-shaped protrusions, and the needle seat is slidably inserted into the cylindrical hole of the outer sleeve. Inside, the front part of the sealing ring on the outer wall is provided with a plurality of strip-shaped grooves in the axial direction, and the sealing ring realizes the dense Closed, the rear end of the needle seat is provided with a puncture cone with a handle, the front end of the piston is provided with a film area, and the front end of the core rod of the piston is provided with an elastic collet, and the outer sleeve is also provided with a retaining mechanism, which is tapered at the rear end of the outer sleeve The boss is provided with a retaining ring, and the inside of the retaining ring is provided with a core rod positioning groove, and correspondingly, a recessed boss is arranged between the weakened area on the core rod and the push plate.

 Comparative document four, patent number: ZL200320108568. 2, publication number: CN2654139, patentee: Lu Yuxue, in this case, a "injection needle retractable safety syringe" is disclosed, which discloses a needle retractable safety syringe , consisting of a push rod, a syringe, an upper needle seat, a lower needle seat and a rubber plug, wherein the rear end of the push rod has a flange, the front end is provided with a push rod fixing seat, and the push rod fixing seat is composed of a fixing ring and a lock part Forming; the syringe is a cylindrical body, the rear end has a flange, and the front inner portion is provided with a lower needle seat fixing bump; the upper needle seat is formed by a socket, a tapered cone surface, a cylinder body and a needle socket; the lower needle seat is connected by The locking hole, the flange, the upper edge of the lower needle seat and the plunger are formed, and the locking head of the front end of the push rod is inserted into the locking hole of the lower needle seat, and the locking rod of the lower needle seat is inserted into the socket of the upper needle seat. The upper edge of the lower needle seat is sleeved with the inclined cone surface of the upper needle seat; the rubber plug is set on the fixing seat at the front end of the push rod.

 Comparative Document V, Patent No.: ZL200520016075. 5, Publication No.: CN2748099, Patentee: Danyang City Chuangchuang Medical Device Technology Co., Ltd., in this case, a "safety syringe with automatic needle retraction" is disclosed, which discloses A safety syringe for automatically retracting a needle includes an injection syringe, a barrel push rod, a needle seat, a syringe needle, a 0-type seal ring, a compression spring plug, a compression spring, a sealant ring, a protective cap and a piston, and an injection The needle tube is fixed in the needle seat, and the front end of the injection syringe is provided with a fixing device for fixing the needle seat and the compression spring plug. The needle seat and the compression spring plug are arranged to push the needle seat and the injection needle into the barrel push rod. The inner compression spring; the cylindrical push rod is inserted in the injection syringe, the outer end of the cylindrical push rod is set on the outer side of the sealing rubber ring, and the inner side is fixed to the inside of the cylindrical push rod under the reverse thrust of the needle seat The other end of the piston extends from the injection cylinder and is provided with a push end. The push end includes a handle and an end connected to the push rod, and the end is tightly engaged with one end of the push rod. And a circular plate is arranged at the end, and a through hole is arranged on the circular plate, and the hand is connected with the easy-fold structure at the connection with the circular plate.

 There are many types of safety syringes, but they all have the following disadvantages: 1. The thrust of the needle can only be about 30 Newtons, the needle is easy to be pressed during operation; 2, when the core rod and the needle are engaged The required thrust force is large, and it is not easy to realize one-hand operation; 3. The pull-back force required for the core rod to pull back is large; 4. The product structure is complicated, and it is difficult to open the mold and assemble.

In summary, there is still a need to further improve the structure of existing safety syringes. Summary of the invention:

 It is an object of the present invention to provide a safety syringe having a needle portion capable of withstanding a thrust of 80 Newtons, a core thrust of less than 15 Newtons when the safety mechanism is activated, and a pullback force of the core rod of less than 15 Newtons, completely overcoming the existing The shortcomings and deficiencies of safety syringes.

 In order to achieve the above object, the technical solution of the present invention is: a safety syringe, which mainly comprises a cylinder body, a needle is arranged at the end of the cylinder body, a needle tube is arranged at the end of the needle body, and a core rod is arranged in the cylinder body, and the core rod is close to the end portion The rubber plug is characterized in that: the needle is sleeved by the outer needle seat and the inner needle seat, the end of the core rod is provided with a pull-back column, and the pull-back column protrudes from the surface of the rubber plug, and the pull-back column The inner cavity of the end is hollow, and the cavity is inverted cone-shaped. The inner wall of the inner cavity of the pull-back column is provided with an inner needle seat pull-back snap ring, the upper part of the inner needle seat is cylindrical, and the lower part of the inner needle seat is composed of fins, and the fins are formed. One end of the two fins is fixed to the cylindrical end portion, and the other end of the two fins is combined into a conical structure, and the conical structure can be closed or open, and the fins are provided with lateral fin grooves. An upper step is formed at an upper portion of the groove of the fin, a lower step is formed at a lower portion of the groove of the fin, and a sealing ring limiting annular groove is disposed in the outer needle seat, and the sealing ring of the needle seat is disposed on the sealing ring of the sealing ring Inside the slot.

 The invention discloses a safety syringe. The product body adopts a 6:100 taper and is universally used in international standards. It can be replaced with a conventional needle. The needle head can withstand a thrust of more than 80 Newtons, and overcomes the existing market safety syringe can only withstand 30. The disadvantage of Newton's left and right thrust, in addition, the thrust of the syringe required to apply to the core rod when starting the safety structure is less than 15 Newtons, which can realize one-hand operation, which is much smaller than the thrust required by the traditional safety structure syringe, and the product The pulling force applied to the core rod is less than 15 Newtons. This force is also lower than the tension required for the conventional safety structure syringe. The needle seat sealing ring between the inner needle seat and the outer needle seat makes the needle head well sealed. It can be applied to tropical and cold environment. The products are all made of plastic except for the needle tube. All parts are easy to open. The syringe can realize the assembly of automatic parts. The product structure is simple and practical, and the safety locking structure has high stability. Very good market prospects.

 BRIEF DESCRIPTION OF THE DRAWINGS:

 1 is a schematic structural view of the present invention

 Figure 2 is a schematic view of the needle structure of the present invention

 3 is a schematic view showing the assembly structure of the cylinder body, the rubber plug and the core rod of the present invention;

 Figure 4 is an assembly drawing of the present invention

 Figure 5 is a schematic view showing the structure of an inner needle seat of the present invention;

6 is a schematic structural view of another embodiment of the inner needle seat of the present invention; Figure 7 is a schematic view of the liquid absorption state of the present invention

 Figure 8 is a schematic view showing the state of the present invention when the injection is completed

 Figure 9 is a schematic diagram of the security state of the present invention

 Figure 10 is a schematic view showing the structure of the outer needle seat of the present invention

 Figure 11 is a schematic view showing the enlarged structure of the needle holder of the present invention

 12 is a schematic structural view of an embodiment of a cylinder of the present invention;

 Figure 13 is a schematic view showing the structure of another embodiment of the cylinder of the present invention

 Figure 14 is a schematic view of the core structure of the present invention

 Figure 15 is a schematic structural view of another embodiment of the present invention

 detailed description:

 The present invention will be further described below with reference to the accompanying drawings.

The invention is a safety syringe, which mainly comprises a cylinder 1 , a needle is arranged at the end of the cylinder 1 , a needle tube 4 is arranged at the end of the needle, and a core rod 3 is arranged in the cylinder 1 , and the core rod is arranged near the end The rubber plug 2 is different from the prior art in that: the needle is sleeved by the outer needle base 5 and the inner needle seat 6, and the end of the core rod 3 is provided with a pull-back column 7, and the pull-back column 7 protrudes from The upper surface of the rubber plug 2 has a cylindrical shape, and the lower portion of the inner needle base 6 is formed by a fin 8 having one end fixed to the cylindrical end portion, and the other end of the two flaps 8 is combined. The tapered structure and the tapered structure of the fin structure can facilitate the lower part of the inner needle seat to enter the inner cavity of the pull-back column, and the tapered structure can be closed or open, and the upper needle seat 6 is provided with the inner cylinder. The needle ring annular rib 14 is sleeved with a needle seat sealing ring 9 at the inner ring annular rib 14 , and the needle seat sealing ring 9 is disposed between the inner needle seat 6 and the outer needle seat 5 to form a sealing structure between the three. The outer needle hub 5 is provided with a sealing ring limiting annular groove 10, and the needle seat sealing ring 9 is disposed in the sealing ring limiting annular groove 10, and the fin 8 is provided with a lateral direction. a groove 11 , an upper step 12 is formed at an upper portion of the fin groove 11 , and a lower step 13 is formed at a lower portion of the fin groove 11 , and a distance between the upper steps 12 of the two fins is larger than that of the barrel 1 Lmm-0. 8mm, needle seat seal, the outer diameter of the inner diameter of the cylinder neck is 0. lm-4mm, and is smaller than the outer neck of the neck, the outer diameter of the needle seal ring 9 is greater than the inner diameter of the annular ring of the seal ring 0. lmm-0. 8mm, needle seat seal The inner diameter of the ring 9 is smaller than the outer diameter of the inner ring seat rib 14 0. 1 _0. 8 The inner needle seat 6 has an outer diameter smaller than the outer diameter of the outer needle seat 5 0. Olmm-1 The upper part of the seat 6 is raised above the upper end of the outer needle seat 5. 0mm l3 The inner end of the end of the pull-back column 7 is hollow, the cavity is inverted cone-shaped, and the inner wall of the inner wall of the pull-back column 7 is provided with the inner needle seat pull-back card. a ring 15, an outer neck 16 is disposed outside the neck 13 of the barrel 1, and an inner thread 17 is provided on the inner wall of the outer neck 16. The needle head is sleeved with a needle guard 18.

 In the specific implementation of the present invention, as shown in FIG. 5, the upper step of the airfoil abuts against the end of the cylinder neck, as shown in FIG. 7, pulling the core rod backward to start the liquid absorption, as shown in FIG. As shown, the core rod is pushed forward and the injection is started. When the injection is completed, as shown in Fig. 8, under the action of the pull-back column, the two flaps are compressed and deformed to the inside, and the lower part of the inner needle seat enters the back. Pulling the columnar inner cavity, at this time, the lower step at the fin is just inside the inner needle seat pull-back snap ring, so that the end of the core rod and the inner needle seat are tightly engaged, as shown in Fig. 9, pulling back The core rod, pull the inner needle seat backwards out of the outer needle seat, pull it to the lower end of the cylinder body, and then break the core rod along the notch at the core rod body to complete the safe scrapping operation of the entire syringe, effectively preventing The syringe needle accidentally injures the operator's accident during the scrapping process of the syringe.

Claims

Rights request  1. A safety syringe, which mainly comprises a cylinder body (1), a barrel head (1) is provided with a needle at the end, a needle tube (4) is arranged at the end of the needle, and a core rod (3) is arranged in the barrel body (1) a rubber plug is disposed near the end of the core rod (2 is characterized in that: the needle is sleeved by an outer needle seat (5) and an inner needle seat (6), and the end of the core rod (3) is provided Pull back the column (7), the pull-back column (7) protrudes from the surface of the rubber plug (2), the inner end of the pull-back column (7) is hollow, the cavity is inverted cone-shaped, and the inner wall of the inner cavity of the pull-back column (7) There is an inner needle back pull-tab ring (15 inner needle seat (6) upper part is cylindrical, inner needle seat (6) lower part is composed of fins (8), one end of the fin (8) is fixed on the above column At the end of the body, the other end of the two fins (8) is formed into a conical structure, the conical structure can be closed or open, and the fins (8) are provided with lateral fin grooves ( 11), an upper step (12) is formed at an upper portion of the fin groove (11), and a lower step is formed at a lower portion of the fin groove (11) (13) the outer needle seat (5) is provided with a seal ring limit Annular groove (10), Said needle hub sealing ring (9) provided in the seal ring limiting the annular groove (10).  2. A safety syringe according to claim 1, wherein: the inner needle seat (6) is provided with an inner needle ring annular rib (14) and an inner needle seat annular rib (14). The sleeve is sealed with a needle seal ring (9). The needle seat seal ring (9) is disposed between the inner needle seat (6) and the outer needle seat (5) to form a sealed structure between the three.  3. A safety syringe according to claim 1, wherein: the distance between the upper steps (12) of the two flaps is greater than the inner diameter of the inner circumference of the barrel (13) of the barrel (1). Lm-4 and smaller than the neck (13) outer neck.  The inner diameter of the needle seal ring (9) is greater than the inner diameter of the seal ring ring (10). 0. lmm-0.8 needle seat seal ring. The inner diameter of the annular rib (14) of the inner needle seat is less than 0. lmm-0.8  5. A safety syringe according to claim 1, wherein: the outer diameter of the upper needle seat (6) is smaller than the outer diameter of the outer needle seat (5) upper end portion 0.01 _1  6. A safety syringe according to claim 1, wherein said upper needle seat (6) has an upper portion that is taller than the outer needle seat (5) and has an upper end portion of 0.1 -3  7. A safety syringe according to claim 1, characterized in that: an outer neck (16) is provided outside the neck (13) of the cylinder (1), and an inner wall of the outer neck (16) is provided. Internal thread (17).