JP2007319249A - Injection syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection syringe in which the possibility of exposing a needle body by an action from the outside is reduced as much as possible when positioning it in a covering posture for covering the needle body, the safety of the injection syringe is ensured, and the structure of a needle part is simplified. <P>SOLUTION: A covering member 9 is provided freely movably from the covering posture for covering the needle body 7 to an exposing posture for exposing it, and the projection part 9a of the covering member 9 is sunk in the recessed part 8d of a needle base 8 to maintain the posture in the covering posture. Thus, even if a load is applied from the outside to the covering member in the covering posture, the projection part is not detached from the recessed part 8d, and the highly safe injection syringe 1 is attained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of syringes for medical use, particularly dental anesthesia, for safe handling of injection needles.

Conventionally, there has been a problem that hepatitis or AIDS develops by infecting pathogenic bacteria by accidentally contacting the needle at a medical site or a syringe processing site, or by puncturing the needle.
From the viewpoint of safety to prevent infection and contamination, this type of syringe is replaced with a new one each time the needle is used, and the used needle is removed from the barrel so that it does not touch the needle body or body fluid. It is required to be transferred to a removal facility and sterilized.
In view of this, there is one in which a covering member is configured by two cone-shaped members that cover the needle body from the distal end side and the proximal end side (see, for example, Patent Document 1). In this case, the needle base is attached to and detached from the barrel while the covering member covering the base end is attached, so that the used needle part is not touched, but a syringe is used. During this process, it is necessary to remove the covering member and store it, which is cumbersome to handle.
One that can be easily handled is one in which a covering member is movably assembled to a needle portion so that the covering member can be moved from a covering posture that covers the needle body to an exposed posture that is exposed (see, for example, Patent Document 2). ).
JP 2000-107291 A JP-A-6-154328

  However, when this is positioned in the covering posture that covers the needle body, the convex portion that protrudes outward from the needle portion is locked through the through hole formed in the covering member. When a force that pushes the protrusion from the side acts, the protrusion is unlocked from the through hole, and the needle body may be exposed, which is dangerous. There is a further problem that it is difficult to form the needle portion due to the complicated structure of the needle portion, and there is a problem to be solved by the present invention.

The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 includes a cylindrical barrel capable of housing a cartridge, and a tip portion of the barrel. A needle portion that is detachably attached to the barrel, a finger hook portion provided at the base end portion of the barrel, and a piston that is movably provided through the finger hook portion and presses the bottom surface portion of the interior cartridge. And a needle base that includes the needle body and a needle base that is provided through the needle body and has a mechanism for attaching to the barrel tip. The needle body covers the needle body. When the covering member supported by the needle base in the covering posture is configured to be movable between the covering posture and the exposed posture in which the needle body is exposed by moving to the barrel side, a concave portion is formed on the outer peripheral surface of the needle base. In the inner peripheral surface of the covering member, It is assumed that a convex portion is formed that is recessed from the outside into the concave portion and is supported in the covering posture, and the convex portion is forced to push the covering member toward the barrel base end side with the needle base attached to the barrel. It is biased to the outside so that it can be removed from the recess and moved to the exposed position of the covering member, and when the covering member moves from the exposed position to the covering position, it returns to the position of being immersed in the recess from the outside. It is the syringe characterized by being made.
A second aspect of the present invention is the syringe according to the first aspect, wherein the concave portion has a retaining portion that prevents the covering member from slipping out toward the distal end side of the needle body.
According to a third aspect of the present invention, in the syringe according to the second aspect, the retaining portion is formed corresponding to the diameter of the covering member and is a portion that protrudes outwardly from the needle base. is there.
A fourth aspect of the present invention is the syringe according to any one of the first to third aspects, wherein a plurality of recesses are arranged in parallel around the circumference of the needle base.
A fifth aspect of the present invention is the syringe according to any one of the first to fourth aspects, wherein the needle base has a tip portion that gradually increases in diameter from the tip and reaches the retaining portion.
A sixth aspect of the present invention is the syringe according to any one of the first to fifth aspects, wherein the covering member maintains an exposed posture in which the convex body is pressed against the barrel to expose the needle body.
A seventh aspect of the present invention is the syringe according to any one of the first to sixth aspects, wherein a plurality of convex portions are provided facing each other in the radial direction.
The invention of claim 8 is characterized in that, in any one of claims 1 to 7, the covering member is provided with a hole for facilitating the outward movement of the covering member of the convex portion. It is a syringe.
A ninth aspect of the present invention is the syringe according to any one of the first to eighth aspects, wherein the covering member is locked to the finger-hanging portion and maintains the exposed posture.
A tenth aspect of the present invention is the syringe according to any one of the first to ninth aspects, wherein the syringe includes a biasing member that biases the covering member toward the covering posture.

According to the first aspect of the present invention, even if a load is applied to the covering member in the covering posture from the outside, the convex portion of the covering member does not come out of the concave portion of the needle base, and a highly safe syringe can be obtained. . Further, since the structure of the needle base and the covering member is simpler than that of the conventional one, the manufacture of the syringe is facilitated.
According to the invention of claim 2, since the covering member can be surely prevented from coming off, it is possible to provide a safety injection needle.
According to the third aspect of the present invention, since the convex portion surely contacts the retaining portion, the covering member can be prevented from coming off.
According to the invention of claim 4, even when the convex portion moving from the exposure posture side to the covering posture side is displaced from the concave portion of the needle base and does not immerse, the covering member is rotated with respect to the needle base. Therefore, for example, a convex portion that does not immerse well in the concave portion is immersed in the adjacent concave portion with the rotation operation of the covering member that is an operation for removing the needle portion from the barrel. When the covering member is further rotated, the needle portion can be removed from the barrel.
According to the invention of claim 5, since the needle part can be manufactured by forcibly inserting the covering member from the distal end side of the needle base, manufacture of the syringe is facilitated.
According to the invention of claim 6, it can be safely used by maintaining the exposure posture by a simple method, and is easy to manufacture.
By setting it as invention of Claim 7, a coating | coated member can be reliably maintained in an exposure attitude | position.
According to the invention of claim 8, it is possible to set a wide movement range of the convex portion outward, and the covering member can be easily transformed from the covering posture to the exposed posture.
By using the syringe according to claim 9, when using the syringe, even if the cover member is accidentally touched, the exposed posture can be reliably maintained by locking, thus ensuring safe use. It can be an injection needle.
According to the tenth aspect of the present invention, when the locking is released, the covering member can be automatically positioned in the covering posture by the biasing b toward the covering posture side by the biasing member.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, 1 is a syringe for dentistry, and the syringe 1 includes a cylindrical barrel 3 in which a cartridge 2 in which a medicine is sealed can be housed, and a barrel-side finger hook provided at one end of the barrel 3. A portion 4, a piston 5 penetrating through the finger-hanging portion 4, the penetrating tip portion contacting the bottom surface portion of the cartridge 2, and a needle portion 6 detachably attached to the tip end side of the barrel 3. In the state where two fingers (for example, forefinger and middle finger) are hung on the barrel side finger-hanging portion 4 and the thumb is hung on the piston-side finger-hanging portion 5 a provided at the protruding base end portion of the piston 5, By pushing in, the bottom surface portion of the cartridge 2 housed in the barrel 3 is pressed by the piston tip portion and moves to the tip side, whereby the needle sealed in the cartridge 2 is provided in the needle portion 6. Such that it consists of the body 7 so that the injection are both conventional.

The needle portion 6 has a hard resin needle base 8 penetrating and supporting the needle body 7, and the needle base 8 has an annular tip-side protruding portion 8 a that protrudes outward (in the present invention). And a base end side protruding portion 8b are arranged side by side, and a partition portion 8c (corresponding to a regulating portion of the present invention) so as to partition the gap between the protruding portion 8a and the protruding portion 8b. Are formed.
Reference numeral 8d denotes a recess, and the recess 8d is formed as a recess composed of projecting portions 8a and 8b and a partitioning portion 8c. In the present embodiment, four recesses are provided in a circular shape.

Reference numeral 9 denotes a covering member, and the covering member 9 is attached to the barrel 3 so as to be integrated with the needle portion 6 in a state where the needle body 7 is covered. It can be moved to the end direction so as to expose the needle body 7.
The covering member 9 has a convex portion 9a formed in the axial direction from the inner peripheral surface, and the convex portion 9a is immersed in the concave portion 8d so that the covering member 9 is positioned in the covering posture. In addition, the two convex parts 9a of this Embodiment are formed facing each other.
Incidentally, in the covering posture, the covering member 9 is set to have a length in the axial direction so that the needle body 7 on the distal end side and the proximal end side exposed from the needle base 8 is covered and cannot be touched from the outside.

As described above, the covering member 9 and the needle portion 5 in the covering posture are integrally attached to and detached from the barrel 3, but the proximal end of the needle base 8 is attached to and removed from the distal end of the barrel 3. A possible attachment mechanism 8e is formed, and has a covering member 9, and the needle body 7 is inserted into the barrel 3 from the proximal end side, and the proximal end of the needle base 8 is aligned with the distal end of the barrel 3, This is done by further rotating the covering member 9 in a state in which the portion 9a is in contact with the partition portion 8c.
By the way, the covering member 9 is made of a resin material, and the convex portion 9a can be biased outward (in the radial direction). Further, in the present embodiment, a long hole 9b is formed around the convex portion 9a. By doing so, it is set so that the convex portion 9a is easily offset. The covering projection 9a is preferably set so that the portion corresponding to the outer peripheral surface of the covering member 9 is sufficiently recessed in the recess 8d and the portion corresponding to the outer peripheral surface of the covering member 9 is recessed inward with respect to the outer peripheral surface of the covering member 9. Even if the above-mentioned portion protrudes and a load is applied by a finger or the like, the projection 9a does not come out of the recess 8d unless the load moves the projection 9a outward.

  When the covering member 9 in the covering posture is attached to the barrel 3 and is applied with a force for moving in the direction of the finger hooking member 4 (base end direction), the convex portion 9a is in contact with the base end side protruding portion 8b. By moving outward (biasing) by the elastic deformation of the covering member 9 and getting over the protrusion 8b, the cover member 9 is set to come out of the recess 8d.

When a force for moving the covering member 9 further in the proximal direction is applied, the covering member 9 moves along the peripheral surface of the barrel 3 until it comes into contact with the finger-hanging portion 4 and assumes an exposed posture in which the needle body 7 is completely exposed. The convex portion 9a in the exposed posture presses the peripheral surface of the barrel 3 by the elastic force that returns inward of the covering member 9, so that the covering member 9 does not move easily. The barrel 3 according to the present embodiment has a diameter larger than at least between the opposed portions of the convex portions 9a in a natural state (a state in which no covering member 9 is fitted inside), and the convex portions 9a are arranged around the barrel 3. The barrel 3 can be pressed at any position as long as it is located on the surface. Further, the barrel 3 can be made to have the large diameter only in the vicinity where the convex portion 9a abuts in the exposure posture.
Incidentally, it is necessary to make the thickness of the convex portion 9a in the axial direction larger than at least the gap S formed between the barrel 3 and the base end side protruding portion 8b so as not to fall into the gap S.

The barrel 3 has an inlet 3c for inserting the cartridge 2 and a push port 3d provided to face the inlet 3c for pushing out the inserted cartridge 2, and the convex portion 9a has an inlet 3c, since it is preferable to avoid being difficult to move in the axial direction by fitting into the push port 3d, the syringe 1 is provided with a guiding mechanism for moving the convex portion 9a away from the entrance 3c and the push port 3d. It has been.
Incidentally, in this embodiment, a part of the convex portion 9a passes over the entrance 3c, but the convex portion 9a is elastically deformed although there is a possibility of touching the tip or the base end of the entrance 3c. There is no. If worried, the barrel sliding surface of the convex portion 9a may be flat.

As the guide mechanism, in the present embodiment, projections 3e projecting outward are formed in a row at the axial edge of the push hole 3d, and the projections 3e are formed in the covering member 9. The movement of the covering member with respect to the barrel 3 is restricted by fitting in the portion 9c. The protrusions 3e do not need to be arranged in a line or parallel to the axial direction, and the movement is guided so that the protrusions 9a do not fit into the entrance 3c and the push opening 3c in the formation position and range. Any configuration is possible if possible.
The guide mechanism is set to guide the covering member 9 from the exposure posture to just before reaching the covering posture in consideration of turning and attaching the needle base 8 with respect to the barrel 3. In other words, the covering member 9 in the covering posture is configured such that the protruding portion 3e does not get in the way when the base end is positioned and rotated closer to the distal end side than the protruding portion 3e.

The syringe 1 is used in an exposed posture, but after use, the covering member 9 is moved toward the distal end side of the injection needle 7 and the convex portion 9a is immersed in the concave portion 8d so as to be in the covering posture.
The protrusion 8a on the front end side of the recess 8d is set to abut against the inner peripheral surface of the covering member 9 or to be opposed with a slight gap, and the protrusion 9a abuts against the protrusion 8a. The covering member 9 is securely inserted into the concave portion 8d by preventing the covering member 9 from moving further toward the tip side. Incidentally, since it is considered that the convex portion 9a is displaced before the convex portion 9a finishes guiding the guiding mechanism and enters the concave portion 8d, a plurality of concave portions 8d are provided adjacent to each other in the circumferential direction, and the protruding portion is provided. 8a is preferably protruded (higher) outward than the base-end-side protruding portion 8b and the partitioning portion 8c. For example, when the protruding portion 9a is displaced and rides on the partitioning portion 8c, It is prevented from coming into contact with the projecting portion 8a higher than the portion 8c to prevent it from coming off, and when the covering member 9 is rotated to remove the needle base 8, any one of the concave portions 8d provided in a circular shape is provided. I can immerse myself.

Then, the needle portion 6 and the covering member 9 in the covering posture are removed from the barrel 3 and discarded while being integrated.
By the way, the attachment of the covering member 9 to the needle base 8 may be forced by pushing the covering member 9 into the needle base 8 so that the convex portion 9a gets over the protruding portions 8a and 8b. The needle base 8 is formed with a tip portion 8f that gradually decreases in diameter from the tip side protruding portion 8a toward the tip direction, and a covering member 9 is fitted on the tip portion 8f from the tip side of the needle base 8. As a result, the convex portion 9a is moved radially outward along the tip portion 8f, and the projection portion 8a is easily overcome and locked into the concave portion 8d. It becomes easy.

  In addition, although the recessed part 8d of this Embodiment is what was partitioned off in the shape of an enclosure, it cannot be overemphasized that it is not restricted to this as long as the convex part 9a can be latched in a latching attitude | position.

  In the embodiment of the present invention configured as described above, the covering member 9 is provided so as to be movable from the covering posture covering the needle body 7 to the exposed posture exposed, but in the covering posture, the convexity of the covering member 9 is provided. Since the portion 9a is immersed in the concave portion 8d of the needle base 8 and maintained in the posture, even if a load is applied to the covering member in the covering posture from the outside, the convex portion does not come out of the concave portion 8d and is highly safe. It can be. Moreover, since the structure of the needle base 8 and the covering member 9 is simpler than that of the conventional one, the syringe 1 can be easily manufactured. Furthermore, since the covering member 9 can be incorporated into the needle base 8 only by pushing the covering member 9 into the needle base 8 from the distal end side, it is easier than before.

  The concave portion 8d is provided with a distal end side protruding portion 8a, and the distal end side protruding portion 8a prevents the convex portion 9a from moving toward the distal end side, so that the covering member 9 is prevented from slipping out toward the distal end side of the needle base 8. can do. Further, the tip side protruding portion 8a is set to contact the peripheral surface of the covering member 9 or to be opposed to the covering member 9 with a slight space therebetween, and the convex portion 9a contacts the protruding portion 8a to cover the covering member 9. The member 9 is set so as to be surely immersed in the recess 8d by preventing the member 9 from moving further toward the tip side. Further, the partitioning portion 8c is provided between the protruding portions 8a and 8b and faces the needle base by rotating the covering member 9 in order to restrict movement of the protruding portion 9a in the covering posture in the rotating direction. 8 can be attached to the barrel 3. Furthermore, since a plurality of concave portions 8d are provided in the circumferential direction of the needle base 8, the convex portion 9a can be formed into any of the concave portions 8d by rotating the covering member 9 even when it is displaced. It can be locked.

Further, the tip portion 8e is gradually reduced in diameter from the distal end side protruding portion 8a toward the distal end direction, and when the covering member 9 is incorporated into the needle base 8, the convex portion 9a facilitates the distal end side protruding portion 8a. Therefore, it can be easily assembled.
Furthermore, the convex part 9a which opposes is a setting which presses the surrounding surface of the barrel 3, and since the coating | coated member 9 of an exposure attitude | position does not move easily with respect to the barrel 3, the needle | hook main body 7 is attached. It does not get in the way when inserting into the patient.

Furthermore, the syringe 1 has a guide mechanism composed of a protrusion 3e and a part 6c. The guide mechanism moves the convex portion 9a while avoiding the entrance 3c and the push port 3d, and from the exposed posture. When returning to the locking posture, the projection 9a is guided so as to be locked to the recess 8d while being positioned so as to be locked to the recess 8d, so that the covering member 9 can be moved smoothly. The convex portion 9a can be guided to the covering posture.
Furthermore, the convex portion 9a is provided so as to oppose in the radial direction, is firmly locked to the needle base 8 in the covering posture, and firmly presses the barrel 3 toward the axial center side in the exposed posture. It is possible to reliably maintain the locking posture and the exposure posture of the member 9. Furthermore, by forming the long hole 9b around the convex portion 9a, the radial movement range of the convex portion 9a can be widely allowed.

Of course, the present invention is not limited to the above-described embodiment, and can be implemented, for example, in the second embodiment shown in FIG. In this configuration, the same reference numerals are assigned to the same components as those in the first embodiment, and the detailed description thereof is omitted.
In the syringe 10 of the second embodiment, the covering member 11 is hooked on the finger hanging portion 12 to ensure the maintenance of the exposed posture, and an elastic machine 13 is provided between the covering member 11 and the finger hanging portion 12. The transformation from the exposure posture to the contact posture is performed by the biasing force of the bullet machine 13. Incidentally, the ammunition machine 13 corresponds to the biasing member of the present invention. In the present embodiment, the guidance mechanism of the first embodiment is not provided in consideration of the expansion and contraction movement of the bullet machine 13.
The covering member 11 is provided with a hanging portion 11a projecting outward at the base end portion, and the finger hanging portion 12 is formed with a groove portion 12a for latching the hanging portion 11a.
The ammunition machine 13 is provided in a state in which one end is fixed to the finger-hanging portion 12, and the other end abuts against the covering member 11 so as to bias the covering member 11 in the distal direction.

Then, the covering member 11 is positioned in the exposed posture against the biasing force of the bullet machine 13 when the locked posture is released, but the exposed posture is maintained by hooking the hanging portion 11a on the groove portion 12a. Therefore, since the covering member 11 can be reliably maintained in the exposed posture as compared with the first embodiment, the syringe 10 can be used with confidence. After the syringe 10 is used, the hook portion 11a is released from the groove portion 12a and the covering member 11 is brought into the contact posture. become.
The ammunition machine 13 of the present embodiment is a coil ammunition, but the base end side fixed to the finger hook part 11 is a thickly wound part 13a with a thickly wound part, and the thickly wound part 13a is a finger hook. It is caught by the part 11 and fixed.
Incidentally, the syringe 10 is not provided with the guiding mechanism of the first embodiment, but may be provided.

  Further, in the present invention, as in the third embodiment shown in FIG. 7, the base end side protruding portion 14a of the needle base 14 can be provided with an inclined surface 14b such that the base end direction becomes higher outward. As a result, the convex portion 15a is moved outward along the inclined surface 14b and can be easily pulled out from the concave portion 14c, so that the covering member 15 can be smoothly unlocked.

  Further, as in the fourth embodiment shown in FIG. 8, in order to prevent the needle body 17 that has been used and removed from the barrel 16 from being reused, the convex portion 18a of the covering member 18 is axially moved. When the extending portion 18b is provided and rotated to remove the covering member 18 from the barrel 16, a through hole is formed in the distal end side protruding portion 19a of the needle base 19 corresponding to the position where the extending portion 18b is located. Even if the 19b is formed and the used needle body 17 is attached to the barrel 16 again, the convex portion 18a can be fitted into the through hole 19b so that the covering member 18 cannot be pulled out in the proximal direction. Although the extending portion 18b of the present embodiment is provided only on the distal end side, the extending portion 18b is provided on the proximal end side or both the distal end and the proximal end, and a through hole is formed at a corresponding position of the needle base 19. You can also

Furthermore, the attachment mechanism 8e for the needle base 8 according to the first embodiment is composed of two sets of teeth, which become male threads and are screwed into the barrel 3, and can be screwed together. The screw base 8 can be screwed at two positions, ie, a position obtained by reversing the needle base 8 180 degrees from the predetermined position. However, when the covering member 9 is moved to the exposed posture side, only one slot 9c is formed. Therefore, the needle base 8 is a mechanism that can be attached only from one predetermined place.
Therefore, as in the fifth embodiment shown in FIG. 9, by forming two slot portions 20 corresponding to the guiding mechanism of the first embodiment so as to face the inner surface of the covering member 21. Regardless of how the needle base 8 is attached, the slot 20 and the protrusion 3e can be aligned.

(A), (B) is the front view of the syringe of a covering posture, respectively, and the front view of the syringe of an exposure posture. (A), (B) is the front view of the syringe which carried out the longitudinal cross-section of the covering member of the syringe of a covering posture, respectively, and the reference figure before attaching a needle base to a barrel. (A), (B) is the side view and front view of the syringe which each carried out the longitudinal cross-section of the coating | coated member of the syringe of an exposure posture. (A), (B) is XX sectional drawing of FIG. 1 (A), YY sectional drawing of FIG. 1 (B). (A), (B), (C), (D), and (E) are a front view, a side view, a front longitudinal sectional view, a side longitudinal sectional view, and a ZZ cross section of FIG. FIG. (A), (B) is the front view which shows the covering attitude | position of 2nd embodiment, respectively, and the front view which shows an exposure attitude | position. (A), (B), (C) is the reference drawing of the needle part and coating | coated member which respectively show 3rd embodiment. (A), (B), (C), (D) is the reference drawing of the needle part and coating | coated member which respectively show 4th embodiment. (A), (B) is the reference drawing of the needle part and coating | coated member which respectively show 5th embodiment, and the reference drawing of a medical needle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe 2 Cartridge 3 Barrel 3e Projection part 4 Finger hook part 5 Piston 6 Needle part 7 Needle main body 8 Needle base 8a Front end side protrusion part 8b Base end side protrusion part 8c Partition part 8d Concave part 8f Tip part 9 Cover member 9a Convex part

Claims (10)

A cylindrical barrel in which the cartridge can be housed, a needle portion that is detachably attached to the distal end portion of the barrel, a finger hook portion that is provided at the base end portion of the barrel, and is provided to be movable through the finger hook portion, A piston for pressing the bottom surface of the interior cartridge,
In the syringe configured to comprise the needle part, a needle body and a needle base provided with the needle body penetrating therethrough and forming a mechanism for attaching to the barrel tip,
In configuring the covering member supported by the needle base in the covering posture covering the needle body to be movable between the covering posture and the exposed posture in which the needle body is exposed by moving to the barrel side.
A concave portion is formed on the outer peripheral surface of the needle base,
On the inner peripheral surface of the covering member, a convex portion that is immersed in the concave portion from the outside and supported in a covering posture is formed.
The convex part can be moved to the exposed position of the covering member by being biased to the outside by forcibly pushing the covering member toward the barrel base end side while the needle base is attached to the barrel. When the covering member moves from the exposed position to the covering position, the syringe is configured to return to the position in which the recess is immersed from the outside.   2. The syringe according to claim 1, wherein the concave portion has a retaining portion that prevents the covering member from slipping out toward the distal end side of the needle body.   3. The syringe according to claim 2, wherein the retaining portion is formed corresponding to the diameter of the covering member and is a portion that protrudes most outward of the needle base.   The syringe according to any one of claims 1 to 3, wherein a plurality of recesses are arranged in parallel around the circumference of the needle base.   5. The syringe according to claim 1, wherein the needle base has a tip portion that gradually increases in diameter from the tip and reaches the retaining portion.   The syringe according to any one of claims 1 to 5, wherein the covering member maintains an exposed posture in which the convex body is pressed against the barrel to expose the needle body.   The syringe according to any one of claims 1 to 6, wherein a plurality of convex portions are provided to face each other in the radial direction.   The syringe according to any one of claims 1 to 7, wherein the covering member is provided with a hole for facilitating the outward movement of the convex covering member.   The syringe according to any one of claims 1 to 8, wherein the covering member is locked to the finger-hanging portion and maintains the exposed posture.   10. The syringe according to claim 1, further comprising a biasing member that biases the covering member toward the covering posture.

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