JP4568201B2 - Finger pad - Google Patents

Description

  The present invention relates to a finger pad attached to a flange portion of a syringe, and more particularly to a finger pad for facilitating hooking of a finger during use and preventing a plunger rod from coming out of a syringe body.

  Usually, a syringe has a barrel for containing a medicine, a plunger rod inserted from the open end of the barrel, and a plunger stopper provided at the tip of the plunger rod, and the outer periphery of the plunger stopper is the barrel. Sliding closely with the inner circumference of the.

  However, when using a syringe, the plunger rod may be pulled too far and pulled out of the barrel, overflowing the medicine. In addition, a flange portion is usually provided at the opening end of the syringe. However, when the outer shape of the flange portion is small, it may be difficult to hook a finger.

  Therefore, in order to solve these problems, a means for preventing the plunger rod from being detached, which can be attached to and detached from the flange provided at the open end of the barrel of the syringe, has been proposed (for example, see Patent Documents 1 and 2). . That is, as shown in FIG. 7, the plunger rod retaining prevention means described in Patent Document 1 is a brim assisting tool that is detachable from the lateral direction to a collar (flange) provided at the opening end of the barrel. In addition, a semi-cylindrical gripping portion 6 that can be fitted and fitted to the outer periphery of the barrel is formed on the upper portion thereof. In addition, a fixing portion 8 having an opening having a U-shaped cross section is provided at the lower portion of the brim auxiliary tool, and the width of the opening is smaller than the diameter of the gasket provided at the tip of the plunger rod. .

  Therefore, when the collar assisting tool is inserted into the collar provided at the opening end of the barrel, the semi-cylindrical gripping portion 6 formed on the collar is closely fitted to the outer periphery of the barrel, and the lateral direction and the axial direction of the collar assisting tool. The gasket provided at the tip of the plunger rod can be prevented from slipping out of the barrel by the U-shaped cross-sectional opening of the fixing portion 8 provided at the lower portion of the collar auxiliary tool.

  As shown in FIG. 8, the plunger rod retaining prevention means described in Patent Document 2 has a pocket 12 detachable in the lateral direction on a flange provided at the opening end of the barrel of the syringe, The upper plate 11 forming this pocket has a semicircular hole fitted to the outer periphery of the barrel, and an opening slit extending from the open end of the semicircular hole to the open end of the pocket. . The lower plate 10 forming the pocket 12 has a through hole 13 smaller than the inner diameter of the barrel.

Therefore, when the flange provided at the open end of the barrel of the syringe is inserted into the pocket 12, the outer periphery of the barrel is fitted into the semicircular hole cut out in the upper plate 11, and the lateral movement is restricted. On the other hand, since the diameter of the through hole 13 opened in the lower plate 10 is smaller than the inner diameter of the barrel, the lower plate can prevent the gasket provided at the tip of the plunger rod from coming out of the barrel.
Utility registration No. 3021855 (page 1-8, FIG. 1 and FIG. 2) Japanese Patent No. 2844377 (page 1-6, FIG. 1, FIG. 3 and FIG. 5)

  However, the means disclosed in the above-mentioned Patent Document 1 has a complicated structure, and accordingly, the manufacturing cost becomes high, and the bulk is bulky, so that a large storage container and a wide storage space are required. Further, although the means disclosed in Patent Document 2 has an excellent feature that the structure is simple and small, there are still the following points to be improved.

  That is, as shown in FIG. 8, the upper plate 11 is formed with an opening slit that can be inserted and fitted on the outer periphery of the barrel and a semicircular hole. An opening hole 13 for preventing the stop is formed. Therefore, the front and back are asymmetrical, and if the front and back are reversed, they cannot be attached to the syringe. For this reason, the size may be small, and it may be necessary to attach the front and back incorrectly and start again.

  Such retaining means are usually made by injection molding synthetic resin, placed on a conveyor and moved to the barrel of the syringe in the next process, or a plurality of parts are stored in a case, etc. And packing. Since this operation is automated, if things that are upside down on the conveyor are mixed, some of them cannot be assembled to the barrel of the syringe, or are stored in a container or the like in a mixed state. For this reason, it was necessary to turn over what was upside down by hand and align it on the same surface beforehand.

  Accordingly, an object of the present invention is to provide a finger pad portion for a syringe that can be used for both the front and back sides, and that does not need to be aligned even when assembled into a barrel or housed in a case or the like.

  The feature of the finger pad according to the present invention to solve the above-described problem is that it is attached to a flange provided at the open end of the barrel of the syringe, and the front and back are symmetrical. That is, the finger pad according to the present invention includes an upper plate portion, a lower plate portion, and a connecting portion that connects them, and the upper plate portion, the lower plate portion, and the connecting portion are in a direction perpendicular to the axis of the barrel. A through passage through which the flange can be freely inserted is formed. The upper plate portion and the lower plate portion each have a through hole that fits with the outer periphery of the barrel, and the through holes are eccentric to each other in the passage direction of the through passage. It is at least larger than the wall thickness of the barrel.

  The upper plate part opens to a part of the circumference of the through hole formed in the upper plate part, and from the opening part opened to a part of the circumference, the center of the through hole of the lower plate part is An upper slit is formed that opens toward the one end of the through passage located in the opposite direction. On the other hand, the lower plate part opens to a part of the circumference of the through hole formed in the lower plate part, and the center of the through hole of the upper plate part extends from the opening part opened to a part of the circumference. Is formed with a lower slit that opens toward the other opening end of the through passage located in the opposite direction. And the opening width of the opening part opened to a part of periphery of the said through hole is a little smaller than the outer diameter of the said barrel, respectively.

  Here, “the barrel of the syringe” means a cylindrical container which is a main body part of a syringe for storing an injection drug and the like, and the material thereof is not limited. For example, synthetic resin and glass containers are applicable. “Flange provided at the open end” means a flat flange that protrudes outward from the periphery of the open end opposite to the side where the syringe needle is mounted. The thing of the shape cut out in parallel corresponds. The “upper plate portion” and the “lower plate portion” mean plate-like shapes, respectively, and their shapes and materials are not limited. For example, a synthetic resin material is applicable. The “connecting portion” means a portion that connects the “upper plate portion” and the “lower plate portion” so as to be continuous on both sides of the “penetrating passage” described later.

The “through passage” has a width and a height that allow the above-described “flange” to be inserted, surrounded by the above-described “upper plate portion”, “lower plate portion”, and “connecting portions” on both sides. A passage,
It means a passage that opens to one and the other. It is desirable that the width and height of the “through passage” are slightly larger than the outer peripheral width and thickness of the “flange” described above. “Eccentric to each other in the passage direction of the through passage” means that the center positions of the through holes provided in the “upper plate portion” and the “lower plate portion” are shifted from each other in the passage direction of the passage Means.

  Further, “the amount of eccentricity is at least larger than the barrel wall thickness of the barrel” means that the distance between the center positions of the respective through holes is larger than the barrel wall thickness dimension of the barrel. That is, by making the amount of eccentricity at least larger than the barrel wall thickness of the barrel, as will be described later, the finger pad portion is inserted into the flange, and the through hole formed in the “upper plate portion” and the “lower plate portion” When one of the two is abutted and fitted to the outer periphery of the barrel, the inner periphery of the other through-hole protrudes inward from the inner periphery of the barrel. It is possible to prevent the plunger stopper that slides in close contact with the barrel stopper and coming off from the barrel.

Also, “opening in part of the circumference of the through hole” means notching the upper plate part or the lower plate part provided with the through hole so as to open in part of the circumference of the through hole. In addition, this notched portion means that it is a part of an upper slit or a lower slit described later. "The upper slit that opens toward the end of one opening of the through passage"
It means a slit formed by cutting out the upper plate part while increasing the width of the slit from the part where the part around the through hole is cut out to one opening end of the through passage. .

  When the through hole that opens to the upper plate part and the lower plate part is decentered from each other, the finger pad is inserted into the flange of the barrel, and one through hole is in contact with the outer periphery of this barrel In addition, since the inner circumference of the other through hole protrudes inward from the inner circumference of the barrel, a plunger stopper that slides closely against the inner circumference of the barrel hits the protruding portion, and falls off the barrel. Can be prevented.

  Moreover, since the finger rest part is symmetrical in shape, it can be attached to the flange of the syringe without worrying about the front and back of the upper plate part and the lower plate part. In a further automated process, the finger pad is moved on the conveyor, and when it is assembled to the barrel of the syringe in the next process or when a plurality of parts are stored in a case or the like and packed, Even if a mixture of products having the opposite is mixed, it is not necessary to arrange them on the same surface manually, and the costs for production, packaging, etc. can be greatly reduced.

That is, the finger pad according to the present invention can be easily attached to the flange of the syringe without worrying about the front and back, thereby preventing the plunger rod from coming off. In addition, in the automated production process, it is not necessary to arrange the front and back surfaces on the same surface.
In addition, because of its simple and compact structure, it can be mass-produced at a low price.

The configuration of the finger pad according to the present invention will be described with reference to FIGS. As shown in FIG. 1, a syringe 1 generally includes a cylindrical barrel 2, a plunger rod 4 inserted from an open end 21 of the barrel, and a plunger stopper 3 screwed into the tip of the plunger rod. have. The cylindrical barrel 2 is made of transparent glass, and a disc-shaped flange 22 is formed around the open end 21 of the barrel. A tip portion for mounting an injection needle is provided at the tip of the barrel. 25 is formed. The plunger rod 4 is made of synthetic resin, and in order to minimize the material, the rod portion 41 is formed in a cross-shaped cross section, and a disc-shaped finger pressing portion 42 is provided at the rear end. The plunger stopper 3 screwed into the tip of the plunger rod 4 is
It is made of a synthetic resin having elasticity, and its outer periphery slides closely on the inner peripheral surface of the barrel 2.

  Now, as shown in FIG. 2, the finger rest portion 5 according to the present invention is obtained by injection molding a synthetic resin material, and connecting portions 53, 53 that connect the upper plate portion 51 and the lower plate portion 52 on both lateral sides. It consists of and. The upper plate portion 51, the lower plate portion 52, and the connecting portions 53, 53 form a through passage 54 that is open at both ends. The width and height of the through passage 54 are slightly larger than the outer circumference and thickness of the disc-shaped flange 22 of the barrel 2, and can be inserted into the flange in a direction perpendicular to the axis of the barrel. It has become.

  As shown in FIGS. 3 and 4, the upper plate portion 51 and the lower plate portion 52 have through holes 51 a and 52 a that are fitted on the outer periphery of the barrel 2 on substantially the center line of the through passage 54. Yes. The through holes 51 a and 52 a are provided eccentric to each other in the passage direction of the through passage 54, and the amount of eccentricity e is at least larger than the thickness t of the cylinder wall of the barrel 2. Further, the upper plate portion 51 opens to a part of the circumference of the through hole 51a, and the opening 51b that opens to a part of the circumference is opposite to the center 52f of the through hole 52a of the lower plate part 52. An upper slit 51c opening toward the end is formed toward one opening end 54a of the through-passage 54 located at the end.

  Further, the lower plate portion 52 is opened in a part of the circumference of the through hole 52a, and the direction opposite to the center 51f of the through hole 51a of the upper plate part 51 from the opening 52b opened in a part of the circumference. A lower slit 52c is formed which opens toward the other end 54b of the through-passage 54 located at the end. And as shown in FIG. 4, the opening width of the opening parts 51b and 52b opened to a part of circumference of the through-holes 51a and 52a of the upper plate part 51 and the lower plate part 52 is from the outer diameter of the barrel 2, respectively. Slightly smaller.

  Next, the use of the finger rest 5 according to the present invention will be described with reference to FIGS. The finger pad 5 is attached to the flange 22 of the barrel 2 of the syringe 1. That is, as shown in FIG. 5, first, only the plunger stopper 3 is inserted into the barrel 2 of the syringe 1. Next, when the penetrating passage 54 of the finger pad portion 5 is inserted into the flange 22 of the barrel 2 from the left side of the syringe 1, the outer periphery of the barrel passes through the lower slit 52c that opens toward the left side of the lower plate portion 52. And it fits in the through-hole 52a opened to this lower plate part. At this time, since the opening width of the opening 52b that opens to a part of the circumference of the through hole 52a is slightly smaller than the outer diameter of the barrel 2, the opening is slightly elastically deformed and pushed. The finger rest 5 is pressed so as to spread. After the barrel 2 passes through the opening 52b, the barrel is restrained by the narrow opening, so that it can be prevented from being inadvertently detached.

  When the outer periphery of the barrel 2 is fitted into the through hole 52a of the lower plate part 52, the through hole 51a of the upper plate part 51 is at least larger than the cylindrical wall thickness of the barrel with respect to the through hole of the lower plate part. Therefore, the inner peripheral right end portion of the through hole of the upper plate portion jumps inward from the inner periphery of the barrel. And since the outer diameter of the rod portion 41 of the plunger rod 4 is normally formed sufficiently narrower than the inner diameter of the barrel 2, this rod portion is inserted into the through hole 51a of the upper plate portion 51 and already inserted into the barrel. The plunger stopper 3 can be easily screwed. On the other hand, the outer periphery of the plunger stopper 3 is formed to have a diameter that slides closely to the inner periphery of the barrel 2, and as described above, the inner peripheral right end of the through hole 51 a of the upper plate portion 51 is formed on this barrel. Since the protrusion protrudes inward from the inner periphery, the protruding portion can prevent the plunger stopper from falling off from the open end of the barrel.

  The eccentricity e of the through holes 51a and 52a that open to the upper plate portion 51 and the lower plate portion 52 is the amount of the inner hole of the upper plate portion when the finger rest portion 5 is attached to the flange 22 of the barrel 2. It is sufficient if the right end of the circumference protrudes inward from the inner circumference of the barrel. However, in order to prevent the plunger rod 4 from coming off even if the plunger rod 4 is pulled out with a slightly strong force, FIGS. As shown in the drawing, it is desirable that the right end portion of the inner periphery of the through hole of the upper plate portion is enlarged to the extent that it substantially contacts the outer periphery of the rod portion 41 of the plunger rod 4.

  In FIG. 6, the vertical width of the finger pad 5 is formed to have a dimension that allows the finger to be sufficiently hooked when the syringe 1 is used. In addition, it is not limited to a vertically long hexagon, and may be a vertically long oval or an ellipse. Moreover, since the front and back are symmetrical shapes, the finger rest part 5 can be used in the same manner even if the front and back sides are switched.

The finger pad of the present invention is simple and small in structure, and can be assembled and used without distinction between the front and back.
It can be widely used in industries related to syringes.

It is a perspective view of a syringe. It is a front view of a finger rest part. It is a perspective view of a finger pad. It is a top view of a finger pad. It is a longitudinal cross-sectional view of a syringe. It is a cross-sectional view of a syringe. It is explanatory drawing which shows the structure of the conventional finger rest part. It is a perspective view of the other conventional finger rest part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe 2 Barrel 21 Open end 22 Flange 3 Plunger stopper 4 Plunger rod 5 Finger rest part 51 Upper plate part 51a Through hole 51b Open part 51c Upper slit 51f Center of through hole 52 Lower plate part 52a Through hole 52b Open part 52c Lower slit 52f Center of through hole 53 Connecting portion 54 Through passage

Claims (1)

It is attached to the flange provided at the open end of the barrel of the syringe,
An upper plate portion, a lower plate portion and a connecting portion for connecting them;
The upper plate portion, the lower plate portion, and the connecting portion form a through passage through which the flange can be inserted in a direction perpendicular to the axis of the barrel,
In the upper plate portion and the lower plate portion, through holes that fit into the outer periphery of the barrel are respectively opened,
The through holes are eccentric to each other in the passage direction of the through passage, and the amount of the eccentricity is at least larger than the cylindrical wall thickness of the barrel,
The upper plate part opens to a part of the circumference of the through hole formed in the upper plate part, and from the opening part opened to a part of the circumference, the center of the through hole of the lower plate part is An upper slit is formed that opens toward the one end of the through-passage located in the opposite direction and widens toward the end,
The lower plate part opens to a part of the circumference of the through hole formed in the lower plate part, and from the opening part opened to a part of the circumference, the center of the through hole of the upper plate part is A lower slit is formed which opens toward the other opening end of the through-passage located in the opposite direction and widens toward the end,
The finger rest part, wherein an opening width of the opening part that opens to a part of the circumference of the through hole is slightly smaller than the outer diameter of the barrel.

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