JP2006068347A - Injection needle positioning device of safe syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe syringe which keeps an injection needle shank connected tightly and eases the removal of the injection needle shank. <P>SOLUTION: Convex bodies 23 are arranged on an inner wall of an injection needle plug 22 located on the front end of the syringe 2. Guide channels 44 each having openings 441 on both ends are formed on an upper peripheral surface of the injection needle shank 41 of an injection needle set 4. Each of the guide channels is tilted from a higher position near the openings 441 to a lower position in the middle of the channel. When the injection needle shank 41 is rotated at a predetermined angle, the convex body 23 is guided along the guide channel 44 from an arbitrary opening 441 on either ends of the guide channel and is positioned at the lowest position of the guide channel 44. In such a state, the injection needle shank 41 is pushed toward the inner surface of the injection needle plug 22 from a lower side to an upper side. When the injection needle shank 41 is rotated by a plunger 3, the guide channel 44 moves along the convex body 23 and pushes the injection needle shank 41 downward. In such a state, the injection needle set 4 can be pulled back to the inside of a cylindrical body 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a safety syringe, in particular by means of a guide groove which presents an upward arcuate or V-shaped opening at both ends, enabling tight coupling and positioning from bottom to top with an inclination for pushing and pulling back, In addition, the present invention relates to a safety syringe that allows a syringe needle set to be pushed downward and pulled back into the cylindrical body by rotating a plunger clockwise or counterclockwise.

  A general syringe is discarded after the injection solution is extruded. Since medical personnel or cleaning staff are often stabbed into the needle cannula, the needle after the injection is completed is pulled back into the syringe together with the plunger, and the front end needle cannula is bent and broken by the rotational force. Patent Documents 1 to 25 disclose safety syringes that enable this.

  Further, as shown in FIG. 1, the safety syringe disclosed in Patent Document 26 has an injection needle insertion seat 12 at the front end of the cylindrical main body 11, and a convex shape for positioning on the inner wall of the injection needle insertion seat 12. By having two bodies 121 and having an L-shaped locking groove 131 on the outer edge surface of the syringe needle 13 facing the convex body 121, the syringe needle 13 is formed into a cylindrical body as shown in FIG. 11 is inserted upward from the bottom surface and can be attached to the inner wall of the injection needle insertion seat 12.

However, the above-described structure has the following two points.
One is that when the L-shaped locking groove 131 and the convex body 121 are fitted, the convex body 121 is located at a position where the end of the horizontal end of the L-shaped locking groove 131 is sealed. In order to fit the insert 141 at the front end into the locking groove 132 at the bottom edge of the needle handle 13, it is rotated in a specific direction clockwise or counterclockwise, and the bottom edge of the L-shaped locking groove 131 is Needs to be separated from the convex body 121. Therefore, the user makes a mistake in the direction and the needle handle 13 cannot be taken out from the needle insertion seat 12.

  The other is that the joint surface 15 of the needle handle 13 and the needle insertion seat 12 is flat. If the coupling surface 15 is not tightly coupled, the injection solution may leak out. Therefore, as shown in FIG. 2 (B), the injection needle handle 13 is rotated and separated from the bottom end of the L-shaped locking groove 131. In order to take it out, there is no choice but to apply force and pull the needle handle 13 downward by the plunger 14 and pull it back. Therefore, the problem that it is difficult to use occurs.

  In addition, a prior patent proposal for positioning an injection needle handle by an L-shaped locking groove is disclosed in Patent Document 27. Prior patent proposals for positioning an injection needle handle by a thread structure are disclosed in Patent Document 28 to Patent Document 32. Further, Patent Literature 33 to Patent Literature 41 disclose prior patent proposals for positioning an injection needle handle by a locking or compression method.

  The above-mentioned prior patent proposals have different features and assertions, but the problem is that the needle handle and syringe are tightly coupled but difficult to pull back, or easy to pull back, but the degree of coupling is not so good, and the injection solution is One of the problems of leaking well was discovered. Thus, the known safety syringe has room for improvement.

Taiwan Patent Publication No. 189436 Taiwan Patent Publication No. 356013 Taiwan Patent Publication No. 463639 Taiwan Patent Gazette No. 414085 Taiwan Patent Gazette No. 384709 Taiwan Patent Publication No. 359621 Taiwan Patent Publication No. 492328 Taiwan Patent Publication No. 467752 Taiwan Patent Publication No. 475449 Taiwan Patent Publication No. 480185 Taiwan Patent Publication No. 497976 Taiwan Patent Gazette No. 430565 Taiwan Patent Publication No. 471322 Taiwan Patent Gazette No. 332433 Taiwan Patent Publication No. 394027 Taiwan Patent Publication No. 447310 United States Patent No. 5,385,557 United States Patent No. 4,747,830 United States Patent 4,677,980 United States Patent No. 5,242,400 United States Patent No. 4,986,813 United States Patent No. 4,947,863 United States Patent No. 5,533,975 United States Patent No. 5,171,300 United States Patent No. 4,944,723 United States Patent No. 5,273,543 United States Patent No. 5,533,970 United States Patent No. 4,944,723 United States Patent No. 4,978,340 United States Patent No. 5,171,300 United States Patent No. 4,947,863 United States Patent No. 4,986,813 Taiwan Patent Publication No. 492328 Taiwan Patent Publication No. 356013 Taiwan Patent Publication No. 359621 Taiwan Patent Publication No. 463639 United States Patent No. 5,242,400 United States Patent No. 4,747,830 United States Patent No. 5,098,390 United States Patent No. 5,370,619 United States Patent No. 4,911,693

The main object of the present invention is to provide a safety syringe that is easy to remove and has a good degree of sealing for connecting an injection needle.
Another object of the present invention is that when the needle handle is coupled to the needle insertion seat, it has an inclination principle for pushing and pulling back, an upward arc shape or V shape, and both ends are open. The guide groove is to obtain a very good sealing degree.
Still another object of the present invention is to enable the needle needle to be pushed downward quickly even when rotated in any direction by an upward arcuate or V-shaped guide groove, and to save the user's trouble. To achieve the effect of reducing.

  In order to achieve the above-mentioned object, the technical means of the present invention has one or more convex bodies on the inner wall of the needle insertion seat at the front end of the syringe, and the above-mentioned injection at the periphery of the needle handle of the needle set. It has a guide groove corresponding to the inner wall surface of the needle insertion seat, both ends of the guide groove are open and positioned on the upper peripheral surface of the needle needle handle, and tilts downward from the high part of the two openings to the low part of the center. By forming the positioning part, when the needle needle is rotated at a certain angle, the convex body is guided from any opening at both ends of the guide groove, and the convex body is used as the positioning part at the lowest part of the guide groove. Positioning, allowing the needle handle to be pressed from the bottom to the top against the inner wall of the needle insertion seat, and the needle handle rotated in either one of the clockwise or counterclockwise directions by the plunger If the guide groove is convex Move along, the injection needle handle pushed down, is separated from the convex body by one of the openings of the guide grooves, it is to allow the pull back the needle set into the cylindrical body.

  In addition, the inner wall surface of the insertion seat for the injection needle at the front end of the syringe has a conical shape with a narrow top and a wide bottom, and the peripheral edge of the needle handle of the syringe needle set has a conical shape with a narrow top and a wide bottom. In order to position the injection needle handle from the bottom to the top by exhibiting a sloped form for pushing and pulling back, the degree of coupling increases as it is turned, and it is easy to separate without requiring much force to pull back There is.

  As shown in FIG. 3, the needle positioning device of the safety syringe according to one embodiment of the present invention includes a syringe, a plunger, and a needle set. The syringe 2 has a hollow cylindrical main body 21 and an injection needle insertion seat 22 formed at the front end, and has a convex body 23 on the inner wall of the injection needle insertion seat 22. As shown in the drawing, the convex body 23 is preferably symmetrical. The plunger 3 has a rod-shaped main body 31, a stopper 32 attached to the front end, and a fitting body 33 provided so as to protrude from the front end surface of the stopper 32, and the fitting body 33 of which has a conical shape, In addition, a flat surface 331 is provided on at least one side. The injection needle set 4 has a hollow injection needle handle 41 and a needle cannula 42 positioned at the front end of the injection needle handle. The injection needle set 4 is formed by integrally forming the needle cannula 42 and the injection needle handle 41. Alternatively, it is constructed by assembling two independent structures as shown in FIG. Since this part is a well-known technique, detailed description is omitted. Further, as shown in FIG. 4, rubber 45 may be attached to the outer peripheral edge of the needle needle 41 as necessary.

As shown in FIGS. 3, 5, and 6, the injection needle insertion seat 22 of each embodiment has two convex bodies 23 on the inner wall surface, and the injection needle handle 41 is a guide corresponding to the convex body 23. The guide groove 44 has openings 441 at both ends, and is positioned on the upper peripheral surface of the injection needle handle 41. The guide groove 44 is inclined downward from a high position where the two openings 441 are located to a low position in the center. Form.
The guide groove 44 described above may have an upward arc shape as shown in FIG. 7A or a V shape as shown in FIG. 7B. The two common points are that the high portion at both ends is the opening 441 and is inclined downward to the central low portion to form the positioning portion 442.

  FIG. 8 is a cross-sectional view after the injection needle handle 41 is mounted on the inner wall surface of the injection needle insertion seat 22. When the convex body 23 is guided from any opening 441 at both ends of the guide groove 44, the injection needle handle 41 is rotated at a certain angle, and the convex body 23 is positioned at the lowest position of the guide groove 44. As a result, the needle handle 41 is pressed against the inner wall surface of the needle insertion seat 22 from the bottom to the top. Here, the injection needle insertion seat 22 and the injection needle handle 41 have a conical shape with a narrow top and a lower bottom, and the inner wall surface of the injection needle handle 41 and the injection needle insertion seat 22 has a sloped shape for pushing and pulling back. May be. As a result, it is possible to make the mounting convenient and to increase the sealing degree of the coupling surface.

  FIG. 9 is a cross-sectional view showing a use state of the present embodiment. The injection solution in the cylindrical main body 21 is pushed out from the needle cannula 42 by the compression of the plunger 3.

  FIG. 10 is a cross-sectional view after the injection solution is extruded. The plunger 3 is inserted into the cylindrical main body 21, and the fitting body 33 is inserted into the fitting groove 43 at the bottom edge of the injection needle handle 41. Since the fitting body 33 and the fitting groove 43 have a conical shape and have flat surfaces 331 and 431 on at least one side, they are fitted as shown in the enlarged sectional view of FIG. Even if the plunger 3 rotates clockwise as shown in FIG. 12 (A) or counterclockwise as shown in FIG. 12 (B), the syringe needle 41 is driven, and the injection needle While it is possible to rotate in the insertion seat 22, the guide groove 44 moves along the convex body 23 from the positioning portion 442, forms a downward compression force, pushes the needle needle 41 downward, It separates from the convex body 23 by the opening 441 on the right side or the left side of the guide groove 44, and the needle set 4 is smoothly pulled back into the cylindrical main body 21 as shown in FIG.

  Further, as shown in FIG. 14, a restraining annular surface 221 may be provided at the front end of the injection needle insertion seat 22, and a spring 24 may be provided between the inner edge of the annular surface 221 and the injection needle handle 41. Thereby, when the injection needle handle 41 is moved downward, the injection needle handle 41 can be moved downward by the elastic force of the spring 24 and smoothly pulled back into the cylindrical main body 21.

  As described above, according to the injection needle positioning device of the safety syringe according to each embodiment of the present invention, the user uses the upward arcuate or V-shaped guide groove 44 having openings at both ends. When pulling back the injection needle, the injection needle handle 41 is automatically pushed downward even if the plunger 3 is turned from any direction. In addition, the slope design for extruding and pulling back improves the degree of sealing when assembling the needle, and it can be pulled back smoothly, making it easier to use and reducing the user's effort. The purpose of making it possible can be achieved.

From the above description, it is considered that the technical means posted according to the present invention has all the claimed elements such as novelty, inventive step, industrial utility value and the like.
Also, since the above description is only a relatively preferred embodiment of the present invention, it is within the scope of the present invention to make equivalent changes and modifications based on the scope of the present invention.

FIG. 3 is an exploded view of a known syringe. FIG. 2 is a partial cross-sectional view after assembly of FIG. 1. It is sectional drawing which shows pullback of the plunger of FIG. 2 (A). It is an exploded three-dimensional view of the syringe concerning one example of the present invention. FIG. 6 is an exploded view of a syringe according to another embodiment of the present invention. It is a perspective view which shows the structure of the injection needle handle which concerns on one Example of this invention. FIG. 6 is a plan view of FIG. 5. It is a figure which shows the guide groove which concerns on one Example of this invention. It is a figure which shows the other Example of a guide groove. It is sectional drawing after attaching an injection needle handle to the injection needle insertion seat. It is sectional drawing which shows the use condition of the syringe which concerns on one Example of this invention. It is sectional drawing after the injection solution of FIG. 9 was extruded. It is an expanded sectional view which follows the 11-11 line of FIG. It is sectional drawing which shows that a plunger rotates an injection needle handle clockwise, and pulls back downward. It is sectional drawing which shows that a plunger turns an injection needle handle counterclockwise, and pulls back downward. It is sectional drawing which shows pulling back an injection needle set inside a cylindrical main body. It is sectional drawing which shows the injection needle insertion seat of the further another Example of this invention.

Explanation of symbols

2 syringe, 21 cylindrical body, 22 needle insertion seat, 221 annular surface, 23 convex body, 24 spring, 3 plunger, 31 rod body, 32 stopper, 33 fitting body, 331 plane, 4 needle set, 41 Injection needle handle, 42 needle cannula, 43 fitting groove, 431 plane, 44 guide groove, 441 opening, 442 positioning part, 45 rubber

Claims (8)

A syringe having a hollow cylindrical main body and an injection needle insertion seat formed at the front end of the cylindrical main body;
A plunger having a rod-shaped main body, a stopper attached to the front end of the main body, and a fitting body provided so as to protrude from the front end surface of the stopper;
An injection needle set having a hollow injection needle handle and a needle cannula positioned at a front end of the injection needle handle, a bottom edge of the injection needle handle facing the fitting body, and a fitting groove for fitting it; With
The inner wall of the injection needle insertion seat at the front end of the syringe has one or more convex bodies,
In the peripheral edge of the injection needle handle of the injection needle set, there is a guide groove corresponding to the convex body on the inner wall of the injection needle insertion seat,
The guide groove has openings at both ends, and is positioned on the upper peripheral surface of the injection needle handle. By forming a positioning portion that tilts downward from the high portion of the two openings to the lower center portion, the guide groove of the injection needle handle is formed. Guide the convex body from any opening at both ends, rotate it at a certain angle, position the convex body at the positioning part at the lowest position of the positioning part of the guiding groove, and inject the needle handle from bottom to top The guide groove moves along the convex body when it can be pressed against the inner wall of the insertion seat and the needle handle is rotated by the plunger in one of the clockwise or counterclockwise directions. An apparatus for positioning an injection needle of a safety syringe, wherein the injection needle handle is pushed downward, separated from the convex body by one opening of the guide groove, and the injection needle set is pulled back into the cylindrical body.   The inner wall of the needle insertion seat at the front end of the syringe has a conical shape with a narrow top and a wide bottom, and the periphery of the needle handle of the syringe needle set has a conical shape with a narrow top and bottom, and its coupling surface is extruded. 2. The positioning device for an injection needle of a safety syringe according to claim 1, wherein the positioning device has a slope shape for pulling back and back.   2. The injection needle positioning device for a safety syringe according to claim 1, wherein the fitting body of the plunger and the fitting groove of the needle handle have a conical shape and have a flat surface on at least one side.   2. The positioning device for an injection needle of a safety syringe according to claim 1, wherein the convex body on the inner wall surface of the injection needle insertion seat is formed bilaterally symmetrical.   2. The injection needle positioning device for a safety syringe according to claim 1, wherein the guide groove of the injection needle handle is formed to be bilaterally symmetrical.   6. The injection needle positioning device of the safety syringe according to claim 5, wherein the guide groove has an upward arc shape.   6. The injection needle positioning device for a safety syringe according to claim 5, wherein the guide groove has a V shape.   2. The injection needle positioning device for a safety syringe according to claim 1, wherein the front end of the injection needle insertion seat has an annular surface for restraining, and an inner edge of the annular surface has a spring.

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