JP3295604B2 - Syringe into which needle is collected - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe in which a syringe needle is collected in a syringe, automatically tilts, and has no compression ring. According to the present invention, the injection needle is not only recovered in the syringe after the completion of the injection, but also has an excellent safety because the needle tip is inclined and pushed and bent in the syringe and never exposed. Also, the piston set is saved, and significant cost savings can be achieved.

[0002]

[Prior Art] "Simplified Safety Syringe With Ret"
There is an invention (US Pat. No. 5,328,475) patented in the United States under the title of "ractable Self-Biased Needle". In this invention, the mounting portion of the injection needle has a cylindrical shape, and a compression ring Is provided so as to be fixed in the close contact groove in the mouth of the syringe body. However, when the piston is pushed forward during injection, the mounting portion of the injection needle may not be firmly fixed and the injection needle may come off the syringe.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the mounting portion of the large-sized rubber injection needle of the above-mentioned invention is made as small as possible, and the close contact portion outside the mounting portion of the injection needle is formed by combining one constriction and a recess. By removing the complicated structure such as the conventional compression ring, a simple projection is provided inside the mouth of the syringe body, and the injection needle is fixed so that it does not protrude too far. The streamlined mounting section ensures that the device retracts smoothly when collected into the main unit. As a result, it is possible to meet the needs of medical technology that requires reliable operation, and to simplify the structure, thereby reducing the amount of rubber used and contributing to cost savings. Furthermore, they are excellent in terms of safety and have been devised to prevent environmental pollution and secondary infection.

[0004]

In order to solve the above problems, a syringe in which a needle according to the present invention is collected is a cylindrical syringe.
With a flat shoulder in front of it
There is a mouth in a proper position, and the front of the mouth is slightly wide
The back of the mouth is straight cylindrical, front and back
There is a protrusion between the parts, the end of the body is a rim,
Syringe body with a stopper on the inner wall of the
A resilient injection needle attachment, and the needle is
And the upper part of the needle attachment part
Each of the syringes has a hollow
It corresponds to the part and the protrusion that are open in the
The attachment part is fixed to the mouth of the syringe body, and the injection needle attachment part
Has a trumpet-shaped inclined room in the center of the bottom of the
There is a hole in the center of the chamber, which leads to the needle point,
Syringe needle set and the inside of the syringe body
A piston stopper that moves freely and sends the drug solution to the injection needle;
Hold the piston, the stopper of the syringe body to the piston stopper
Is provided with a contact groove corresponding to the
Inside movement, the arrow-shaped joint becomes a piston stopper
The head of the arrow joint is fixed with one axis
It is attached to the front of the joint,
And a piston set that fits into
When you start firing, the constriction and dent of the needle attachment
Inject the syringe into the mouth of the syringe
The injection needle is firmly fixed, the injection is completed and the piston
When the piston is pushed all the way to the front of the syringe body, the piston
The arrow-shaped joint at the end of the set has a needle attached.
Stuck in the trumpet-shaped vacancy of
The needle and piston set are integrated, and the piston is
When retracted again, the needle is retracted with the piston.
To be collected inside the syringe and attached to the needle
The collected needle is tilted due to the inclination of the vacant space in
When the piston is pushed again, the needle point is inside the shoulder of the syringe body.
It is characterized by hitting the wall, being bent and crushed
Things. The syringe in which the needle is collected inside has a simple structure and reliability of operation is obtained, the injection needle is fixed to the mouth of the syringe at the time of injection, the injection needle is collected in the syringe after injection, and destroyed, It is a very safe syringe that will not be exposed again , especially to improve the internal structure and piston part, while keeping it as simple as possible to meet the needs of medical activities that require certainty. This makes it possible to reduce the amount of materials used to reduce costs. In addition, the danger of secondary infection is prevented by devising a method in which the injection needle is securely recovered after being used and collected in the syringe.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A syringe according to the present invention comprises a syringe body 1
And a needle set 2 and a piston set 3. The syringe body 1 has a cylindrical syringe body cylinder 11.
And a cylindrical inner tube 10 for injecting the chemical solution 4 inside. The front of the syringe body 1 has a flat shoulder 15a,
The mouth 12 of the syringe body protrudes at an appropriate position on the shoulder 15a. The front part of the mouth 12 of the syringe body is a trumpet tube 120a.
The rear portion is a cylindrical tube 121 at the mouth of the main body. There is a protrusion 120 between the front and the rear, and the mouth 1 of the syringe body
Numeral 2 is connected to the shoulder 15a at a branch point 122. The distal end of the barrel 11 of the syringe body has an outwardly projecting lip 14 for convenient operation. A stopper 16 is provided on the inner wall at the rear to prevent the piston set 3 from coming off the cylinder 11 of the syringe main body at the time of injection and preventing the chemical solution 4 from leaking out. The inner wall of the barrel 11 of the syringe main body has at least one or more vertically extending longitudinal grooves 17 of the inner wall of the main body, and when the piston set 3 moves inside the barrel 11 of the syringe main body, the piston set 3 moves smoothly, and loosening occurs. It is devised so as not to be.
The syringe body center axis 100 vertically penetrates the center of the barrel 11 of the syringe body.

[0006] The injection needle set 2 comprises an injection needle 21 having a hollow inside, and an elastic needle mounting portion 22 made of rubber. The tip of the injection needle 21 is a needle tip 211, and the injection needle 21 is fixed to the front part of the injection needle mounting part 22. The upper part of the injection needle attachment part 22 has a constriction 261 and a middle depression 26, and is fixed corresponding to the trumpet tube 120 a and the projection 120 in the mouth 12 of the syringe main body 1. It is fixed to the mouth 12.
Injection needle set lowermost part 23 at the lower end of injection needle attachment part 22
0 is provided with a trumpet type hole 231 at the center position. A slightly inclined inclined space 27 is further provided therein, and a front portion thereof is formed with a hole 25, which leads to the inside of the injection needle 21 and serves to pass the chemical solution 4. Injection needle center axis 20
0 passes through the center of the mouth 12 of the syringe body and is parallel to the syringe body center axis 100.

The inclined chamber 27 has a conical shape, and the bottom is an inclined chamber bottom 271. When going upward, the inclined chamber 27 has a rounded cone-shaped inclined chamber apex 272. bump into. The chamber center axis 270 intersects perpendicularly with the inclined chamber bottom 271 and forms an angle A with the syringe body center axis 200 and the syringe body center axis 100. These are as shown in FIG. 1 and FIGS.

[0008] The piston set 3 is a piston stopper 31 which moves smoothly in the cylinder 11 of the syringe body, and the liquid medicine 4 is pushed forward to smoothly pass through the cylinder 11 of the syringe body. And a cross-shaped piston 35 for the purpose of injection. The arrow-shaped joint 30 is embedded in the piston stopper 31, and the arrow-shaped joint head 301 and the arrow-shaped joint neck 302 are inserted into the inclined empty space 27 of the injection needle set 2 at the front of the arrow-shaped joint 30. It is mounted in a position where it fits. The piston stopper 31 is provided with a close contact groove 311 to prevent the piston stopper 31 from dropping off in correspondence with the stopper 16 at the lower part of the barrel 11 of the syringe body. The piston center axis 300 and the arrow-shaped joint center axis 301a extend vertically through the centers of the piston set 3 and the arrow-shaped joint head 301, respectively. The central axis 100 of the syringe body and the central axis 200 of the injection needle are in a parallel relationship, which is shown in FIG.
As shown in FIG. The most ideal one of the present embodiment is one in which the mouth 12 of the syringe body protrudes from a position shifted from the center of the shoulder 15a of the barrel 11 of the syringe body. The arrow-shaped joint neck 302 is also mounted at a position offset from the center of the front part of the arrow-shaped joint 30 correspondingly.

In the embodiment shown in FIG. 8, the arrow-shaped joint head 301 of the arrow-shaped joint 30 has a conical shape,
The injection needle set 2 fits into the inclined empty chamber 27 so as to fit therein. A substrate projection 304 is attached to the substrate 303 so as to go around the periphery of the substrate 303.
03 plays a role of completely fixing the inside of the joint connection tank 34 of the piston set 3. The bottom of the arrow-shaped joint 30 fits into the gap 341 provided inside the joint connection tank 34 at the lower part 305 of the substrate, so that the arrow-shaped joint 30 is firmly fixed on the joint connection tank 34. Support. The support portion 32 is an arrow-shaped joint head 30
1, around which the arrow-shaped joint head 301 has reached the lowermost part 230 of the needle set, helping to fit tightly into the inclined chamber 27.

The embodiment shown in FIGS. 9 and 10 shows that the circular plate 37 at the end of the piston 35 of the piston set 3 corresponds to the edge 14 of the syringe body 1 so that a reliable operation can be performed at the time of injection. I have. On the side surface of the circular plate 37, there is a flat surface 371 that can similarly stably maintain the plane when the syringe main body 1 is placed on the plane F.

According to the above combination, at the time of injection, the depression 26 of the injection needle mounting portion 22 engages with the projection 120 of the mouth 12 of the syringe main body, and the constriction 261 of the injection needle mounting portion 22 becomes the wrapper tube of the mouth 12 of the syringe main body. 1
By corresponding to 20a, the injection needle set 2 is set in the mouth 12 of the syringe body of the syringe body 1. The state before the injection is as shown in FIG. FIG. 2 is a view showing a state in which the piston set 3 is pushed out to the tip of the cylinder 11 of the syringe body after the injection is completed. At this time, the arrow-shaped joint 3 at the tip of the piston stopper 31
0 is pushed forward and reaches the inclined empty space 27 of the trumpet-shaped hole 231 through the lowermost part 230 of the syringe needle set of the syringe needle mounting part 22. Arrow joint 3 of arrow joint 30
02 is hooked at the trumpet type hole 231, and the injection needle set 2 and the piston set 3 are integrated.

Thereafter, when the piston set 3 is pulled back, the injection needle set 2 is also pulled back together, and the injection needle mounting portion 2
The second depression 26 and the constriction 261 are also simultaneously detached from the projection 120 of the mouth 12 of the syringe main body and the trumpet tube 120a, and are recovered inside the cylinder 11 of the syringe main body. At this time, since the inclined empty space 27 of the injection needle mounting portion 22 is slightly tilted, the injection needle 21 is also tilted similarly. Needle tip 21
When 1 is detached from the mouth 12 of the syringe main body, as shown in FIG. 3, it inclines toward the inner wall of the shoulder 15a of the cylinder 11 of the syringe main body. When the piston set 3 is pushed forward again, the needle tip 211 hits the inner wall of the shoulder 15a of the barrel 11 of the syringe body, and the injection needle 21 is pushed and bent and collapsed, as shown in FIG. It is never exposed again while being collected inside the 11, and the security is surely ensured.

In the present invention, the mouth 12 of the syringe body and the arrow-shaped joint head 301 are respectively connected to the shoulder 1 of the barrel 11 of the syringe body.
5a and the embodiment provided at a position deviated from the center of the arrow-shaped joint portion 30. In addition, the mouth 12 of the syringe main body is projected to the center of the shoulder 15a of the cylinder 11 of the syringe main body. Similarly, the arrow-shaped joint head 301 and the arrow-shaped joint neck 302 of the arrow-shaped joint 30 are also attached to the center of the tip of the arrow-shaped joint 30, and the piston set 3 and the injection needle set 2 are connected. Examples are also provided in which the components are integrated. This is as shown in FIGS.

[0014]

As described above, according to the present invention, since the injection needle is collected in the syringe, and the injection needle is automatically inclined and has no compression ring, the broken injection needle is placed inside the syringe. The safety can be guaranteed without being exposed as it is collected. Further, since the structure is simplified, the number of materials can be reduced, and the cost can be reduced. Therefore, the present invention can be evaluated from the viewpoint of novelty and inventive step, and at the same time, has great industrial utility value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a syringe according to an embodiment of the present invention before injection.

FIG. 2 is a cross-sectional view showing a state where the piston set and the injection needle set are joined after the injection is completed in the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state in which the injection needle according to the embodiment of the present invention is recovered in the syringe main body.

FIG. 4 is a cross-sectional view showing a state in which the injection needle in the embodiment of the present invention is pressed and bent in the syringe.

FIG. 5 is an enlarged perspective view of a main part of the injection needle set according to the embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a state in which an arrow-shaped joint is joined to an injection needle set in the embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part showing a state in which the injection needle in the embodiment of the present invention is automatically inclined after being collected.

FIG. 8 is a three-dimensional sectional view before assembling according to the embodiment of the present invention.

FIG. 9 is a side view of the syringe of the present invention.

FIG. 10 is a sectional view of FIG. 2 as viewed from below.

FIG. 11 is a cross-sectional view showing a state in which an injection needle according to another embodiment of the present invention is recovered inside the syringe.

12 is a cross-sectional view showing a state in which the injection needle in the embodiment of FIG. 11 is pushed and bent in the syringe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe main body 10 Cylindrical inner tube 100 Syringe main body center axis 11 Syringe main body cylinder 12 Syringe main body mouth 120 Projection 120a Wrapper tube 121 Main body mouth cylindrical tube 122 Branch point 14 Edge 15 Main body cylindrical tube 15a Shoulder 16 Stopper 17 Vertical groove on inner wall of main body 2 Injection needle set 200 Injection needle center axis 21 Injection needle 211 Needle tip 22 Injection needle mounting part 230 Lower part of injection needle set 231 Wrapper type hole 25 Hole 26 Depression 261 Constriction 27 Inclined vacant room 270 271 Inclined room bottom 272 Inclined room top 3 Piston set 300 Piston center axis 30 Arrow joint 301 Arrow arrow joint head 301a Arrow joint central axis 302 Arrow joint neck 303 Substrate 304 Substrate protrusion 305 Substrate bottom 31 Piston plug 311 Close contact groove 32 Support part 34 Contact Part connecting tank 341 clearance 35 piston 37 circular plate 371 flat surface 4 chemical

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61M 5/31 A61M 5/32

Claims (4)

(57) [Claims] 1. It has a cylindrical shape, has a flat shoulder at the front, has a mouth at an appropriate position on the shoulder, the front of the mouth is slightly widened in a trumpet shape, and the rear of the mouth is Is a straight cylinder, with a protrusion between the front and back, a rim at the end of the body, a syringe body with a stopper on the inner wall at the rear, a needle and a resilient needle mounting A needle is fixed to the injection needle mounting portion, the upper stage of the injection needle mounting portion is constricted and has a recess, respectively corresponding to the trumpet-shaped portion and the protrusion of the mouth of the syringe body, The injection needle mounting part is fixed to the mouth of the syringe body, has a trumpet-shaped inclined room at the center of the bottom of the injection needle mounting part, and a hole is opened in the center of the room, and the hole extends to the needle tip. Injection needle set and the inside of the syringe body Freely have moved piston stopper and piston fed into the injection needle drug solution, the piston stopper is provided with a contact groove corresponding to the stopper of the syringe body,
Limiting the movement of the piston stopper in the syringe, the arrow-shaped joint is fixed to the piston stopper, the head of the arrow-shaped joint is attached to the front of the joint with a single shaft,
A piston set that fits into the inclined chamber of the injection needle set. When starting the injection, the constriction and depression of the injection needle mounting part correspond to the trumpet-shaped part and the projection of the mouth of the syringe body,
When the injection needle is firmly fixed and the injection is completed and the piston set is pushed to the forefront of the syringe body, the arrow-shaped joint at the tip of the piston set is inserted into the trumpet-shaped empty space at the injection needle mounting part. The syringe needle and the piston set are integrated, and when the piston is pulled back again, the needle is pulled back together with the piston and collected inside the syringe. The needle collected by the method is tilted, the axis is displaced, and when the piston is pressed again, the needle tip hits the inner wall of the shoulder of the syringe body and is pushed and bent, and the needle is recovered inside. 2. The mouth of the syringe body projects at the center of the shoulder of the syringe body, and the head and neck of the arrow-shaped joint of the piston set are also at the center of the front of the arrow-shaped joint. The syringe according to claim 1, wherein: 3. The mouth of the syringe body projects out of the center of the shoulder of the syringe body, and the head and neck of the arrow-shaped joint of the piston set are also offset from the center of the front of the arrow-shaped joint. 2. The syringe of claim 1, wherein the syringe is in a closed position. 4. The syringe according to claim 1, wherein at least one or more grooves are provided inside the syringe body so that the piston moves smoothly inside the syringe.