Adapter device for syringe

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a syringe adapter device in which a syringe for fluid pumping is detachably attached and the syringe is converted into a structure capable of a smooth and easy suction operation with one hand.

【0002】

[Conventional technology]

A syringe generally has an outer cylinder whose tip has a cylinder tip to which a fluid passage such as a tube or a pipe is connected, and an inner cylinder inserted into the outer cylinder, and a piston portion is provided at the tip of the inner cylinder. The piston portion is slid along the inner surface of the outer cylinder by pushing and pulling the inner cylinder with respect to the outer cylinder. A fluid chamber is partitioned inside the outer cylinder by a piston portion, and when the inner cylinder is pushed and pulled, the fluid chamber expands and contracts. As a result, fluid is pumped from the cylinder tip or sucked from the cylinder tip. can do. This syringe is widely used in the medical field and the like for injecting a chemical solution and pumping a cleaning solution.

【0003】

It is desirable that the syringe can be operated by an operator or the like with one hand. For this purpose, a flange-shaped overhanging finger hook portion is formed at the base end portion of the outer cylinder, and a finger rest portion is formed at the base end portion of the inner cylinder, and an operating force acting portion for operating the syringe with these is formed. Is formed. Then, with the thumb in contact with the finger rest, the outer cylinder being sandwiched between the index finger and the middle finger, and these two fingers in contact with the finger rest, the finger rest is placed on the finger rest. When operated in the direction of approaching, the inner cylinder is pushed into the outer cylinder. As a result, the volume of the fluid chamber partitioned by the piston portion is reduced, and the fluid in the fluid chamber is pumped to the fluid passage connected to the cylinder tip. The syringe configured in this way is a syringe for fluid pumping, and is used for a wide range of purposes such as injecting an injection solution or other chemicals into the body, spraying a dye or the like, and cleaning the inner wall of a body cavity.

【0004】

Here, the syringe is used not only for pumping the above-mentioned drug solution or the like, but also for sucking and removing the body fluid or for exerting a suction force on the cells in the body. Be done. The suction syringe has substantially the same configuration as the fluid pumping syringe in its main body, but the configuration of the syringe operating means is different. As mentioned above, the syringe for fluid pumping is suitable for pushing the inner cylinder into the outer cylinder, but in the case of the suction syringe, instead of pushing the inner cylinder into the outer cylinder, the inner cylinder is pushed. It will be displaced in the pulling direction. Therefore, when the syringe for fluid pumping is used as it is for suction, it is necessary to hold the outer cylinder with one hand, hold the inner cylinder with the other hand, and pull the inner cylinder. .. That is, when this type of syringe is used for suction, the operation must be performed with both hands, which is troublesome.

【0005】

For example, when a catheter is inserted into the body cavity through the endoscopic treatment tool insertion channel and the catheter is guided into the pancreatobiliary duct to aspirate and remove pancreatic juice, the operator uses one hand to remove the pancreatic juice. Since the operation unit of the main body is gripped, if the syringe cannot be operated with one hand, the operator himself / herself cannot perform the suction operation, and an assistant for the operation such as a nurse is required. In addition, in an ultrasonic endoscope, when a puncture treatment tool is inserted into the body through the treatment tool insertion channel to perform suction from a bleeding site, or when tissue cells or the like are sucked and taken out, the operation is also performed. After all, the operator cannot operate the syringe. In particular, when performing suction using a puncture treatment tool, it is extremely important to determine where and how much suction should be performed and the timing of the operation. Therefore, the surgeon himself performs the suction operation using a syringe. Is desirable.

【0006】

[Problems to be Solved by the Invention]

In the suction syringe, the positions of the operating force acting portion on the outer cylinder side and the operating force acting portion on the inner cylinder side must be reversed. That is, it is necessary to position the operating force acting portion on the outer cylinder side closer to the base end side than the position of the operating force acting portion on the inner cylinder side. For this purpose, it is necessary to extend the base end portion of the outer cylinder to a position beyond the base end portion of the inner cylinder, and to project the operating force acting portion provided on the inner cylinder from the outer cylinder. For example, the outer cylinder is formed with a pair of left and right slits by a predetermined length, a removable lid is provided at the base end portion thereof, and the inner cylinder is composed of a pair of slits led out from these slits to the outside. A finger hook portion is provided in series, and this functions as an operating force acting portion on the inner cylinder side. When incorporating the inner cylinder into the outer cylinder, the lid is opened, the finger hook provided on the inner cylinder is passed through the slit, and then the lid is closed. When the lid is closed in this way, it functions as a finger pad, that is, as an operating force acting portion on the outer cylinder side. Then, when the thumb is brought into contact with the lid that functions as a finger rest, the index finger and the middle finger are hung on the finger hook, and the finger hook is pushed toward the lid, the inner cylinder is removed. Since the fluid chamber is displaced in the direction of being pulled out from the cylinder and the fluid chamber formed by the piston portion provided at the tip of the inner cylinder is expanded, a negative pressure suction force can be applied to the fluid passage connected to the syringe. ..

【0007】

By the way, the frequency of suction operation of body fluids and the like is extremely low as compared with the case of pressure feeding operation of chemicals and the like, and the syringe dedicated to suction has a structure as compared with the syringe for fluid pressure feeding. Becomes complicated. As described above, since special instruments that are used infrequently are not mass-produced, the cost cannot be reduced and the structure becomes very expensive due to the complexity of the structure. And since suction is performed from inside the body, from the viewpoint of preventing secondary infections, the syringe for suction cannot be reused even though it is expensive like this, and it must be done. Must be discarded after each use.

【0008】

The present invention has been made in view of the above points, and an object of the present invention is to provide a syringe adapter device for converting a syringe for pumping fluid so that it can be operated by suction with one hand. There is.

【0009】

[Means for solving problems]

In order to achieve the above-mentioned object, in the present invention, an inner cylinder provided with a piston portion at the tip is slidably mounted in the outer cylinder, and is mounted on the base end portion of the inner cylinder and the base end portion of the outer cylinder. , Each of which is provided with an operating force acting part, and by operating both operating force acting parts in directions close to each other, it is detachably attached to a syringe that pumps fluid, and an adapter for enabling suction operation by the syringe. A device, an outer cylinder holding portion to which the operating force acting portion on the outer cylinder side is detachably attached, a connecting portion extending from the outer cylinder holding portion in the extension line direction of the outer cylinder, and the connecting portion. It is provided with a second operating force acting portion on the outer cylinder side provided at the end of the connecting portion, and the connecting portion is configured such that the operating force acting portion of the inner cylinder has a length that can be displaced by the suction stroke. That is the feature.

【0010】

Here, the syringe for fluid pressure feeding is provided with an operating force acting portion at the base end portion of the inner cylinder and the outer cylinder. Here, the operating force acting portion is a portion provided for performing an operation of pushing the inner cylinder into the outer cylinder by bringing the fingers into contact with each other when using the syringe. In the syringe for fluid pumping, a finger contact portion for bringing the thumb into contact with the inner cylinder side and a finger hook portion for sandwiching between the index finger and the middle finger are provided on the outer cylinder side. When diverting this syringe for suction, an adapter device is detachably connected to the base end on the outer cylinder side. For this purpose, the adapter device is formed with an outer cylinder holding portion to which the operating force acting portion of the outer cylinder is detachably attached. A connecting portion extends from the outer cylinder holding portion in the extension line direction on the base end side of the outer cylinder, and the second operating force acting on the outer cylinder side is performed at the end portion, that is, at a position beyond the operating force acting portion of the inner cylinder. Provide a part. Therefore, the second operating force acting portion on the outer cylinder side serves as a finger contact portion with which the thumb abuts, and the operating force acting portion on the inner cylinder side functions as a finger hook portion sandwiched between the index finger and the middle finger. However, since the connecting portion extends beyond the operating force acting portion on the inner cylinder side to the base end side, it may be difficult to put a finger on the operating force acting portion on the inner cylinder side. In this case, the second operating force acting portion on the inner cylinder side is detachably attached to the operating force acting portion on the inner cylinder side so as to project to the side of the connecting portion. When suction is performed, the inside of the syringe becomes negative pressure, and when the operating force is released, the piston may be displaced in the direction of being pulled into the outer cylinder. It is desirable to provide a stopper at the connecting portion in order to hold the inner cylinder so that it does not move unnecessarily even when the operating force on the syringe is released. When the operating force acting portion on the inner cylinder side is used as it is, this operating force acting portion shall be directly engaged and disengaged from the stopper. Further, in order to allow the inner cylinder to easily get over the stopper, a passage through which the inner cylinder can pass is formed in the stopper. Further, when the second operating force acting portion is also detachably provided on the operating force acting portion on the inner cylinder side, the stopper is configured so that the second operating force acting portion on the inner cylinder side can be engaged and disengaged.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Thus, in the drawings, FIGS. 1 to 4 show the first embodiment of the present invention, and FIGS. 5 and 6 show different modifications. Further, FIGS. 7 and 8 show a second embodiment of the present invention, and FIG. 9 shows a modification thereof.

【0012】

First, in FIG. 1 in which the syringe and the adapter device are disassembled, and in FIGS. 2 and 3 which are a plan view and a side view of the state in which they are assembled, 1 is a syringe, and this syringe 1 is an outer cylinder. It consists of 2 and an inner cylinder 3. The outer cylinder 2 has a cylinder tip 4 connected to the end wall on the tip side thereof, and the cylinder tip 4 is formed in a tapered shape. For example, a suction made of a tube or a pipe having a luer lock mechanism 5 or the like. It is detachably connected to the passage 6. A flange portion 7 as an operating force acting portion is formed at the base end portion of the outer cylinder 2, and this flange portion 7 functions as a finger hook portion when used for fluid pumping.

【0013】

The base end of the outer cylinder 2 is open, and the inner cylinder 3 is inserted therein. The inner cylinder 3 is provided by connecting the piston portion 9 to the tip of the shaft portion 8. The shaft portion 8 has a shape such as a circular rod shape, and in the illustrated one, an example thereof is a cross-shaped member, and several ribs 10 are continuously provided in the middle position. Has been done. A disk portion 11 is continuously provided at the base end portion of the shaft portion 8, and this disk portion 11 is also an operating force acting portion and functions as a finger contact portion when used for fluid pumping. It is a thing.

【0014】

Therefore, in this syringe 1, the inner cylinder 3 is incorporated into the outer cylinder 2, and inside the outer cylinder 2, a chemical solution or the like is stored in a fluid chamber partitioned by the piston portion 9 of the inner cylinder 3, and the index finger and the like are used. The syringe 1 can be held in a stable state by positioning the middle finger on both sides of the outer cylinder 2 and bringing the flange portion 7 into contact with the flange portion 7 and the thumb against the disk portion 11. Then, when the flange portion 7 is pushed in the direction of pulling it toward the disk portion 11, the chemical solution in the fluid chamber is pressure-fed from the cylinder tip 4 toward the suction passage 6, so that it functions as a syringe for fluid pressure feeding. When operating the syringe 1, whether it is used for fluid pumping or for suction, as will be described later, the index finger and the middle finger are used as the finger hooks, and the finger rest is used. This is a general operation mode of the syringe 1, in which the thumb is attached to one operating force acting portion and the other operating force acting portion is a 1 other than the thumb. Alternatively, it means that the syringe 1 is operated by bringing a plurality of fingers into contact with each other and moving the hand in the closing direction.

【0015】

In order to use the syringe 1 configured as described above for suction, the position of the operating force acting portion is reversed. That is, a portion that functions as a finger rest portion is provided on the flange portion 7 side, and a portion that functions as a finger hook portion is provided on the disk portion 11 side. As a result, when the finger contact portion of the outer cylinder 2 is pushed in a direction close to the finger hook portion provided on the inner cylinder 3 side, the inner cylinder 3 is pulled out from the outer cylinder 2 in the opposite direction to that during fluid pumping. Moving. The adapter 20 is used for this purpose, and the adapter 20 is composed of two members. That is, 21 is an adapter body and 22 is a finger hook member. The adapter body 21 is composed of a roughly gutter-shaped member, an outer cylinder holding portion 23 is formed on the tip end side thereof, and a disc-shaped second finger rest portion 24 is formed on the base end side, and further. A guide portion 25 having a predetermined length is provided between the outer cylinder holding portion 23 and the second finger contact portion 24. Therefore, the second finger contact portion 24 serves as the second operating force acting portion on the outer cylinder side, and the guide portion 25 is a connecting portion provided between the outer cylinder holding portion 23 and the second finger contact portion 24. ..

【0016】

The outer cylinder holding portion 23 is formed with a slit groove 26 in which the base end portion of the outer cylinder 2 is accommodated and the flange portion 7 connected to the outer cylinder 2 is fitted. Further, the inner diameter of the outer cylinder holding portion 23 is an arc slightly larger than 180 °, and when the outer cylinder 2 is fitted to the outer cylinder holding portion 23, the outer cylinder holding portion 23 is slightly expanded. When this outer cylinder 2 is completely fitted, the outer peripheral surface is held by an angle of 180 ° or more. Therefore, the outer cylinder 2 is fitted to the outer cylinder holding portion 23 by a snap action action, and the outer cylinder 2 is locked so as not to deviate from the inside of the outer cylinder holding portion 23. Further, since the flange portion 7 is engaged with the slit groove 26, it is fixed so as not to move in the axial direction.

【0017】

On the other hand, the finger hook member 22 is composed of an arch-shaped connecting main body 27 and a pair of second finger hooks 28 protruding to the left and right of the connecting main body 27, and is an inner peripheral surface of the connecting main body 27. Is formed with a slit groove 29 into which a disk portion 11 continuously provided at the base end portion of the inner cylinder 3 is fitted. Here, the connecting main body 27 is not necessarily indispensable, but has an arc shape having an angle slightly larger than 180 ° in order to stably hold the connecting main body 27 in a state of being assembled to the inner cylinder 3. Further, the second finger hook portion 28 is composed of a thin round bar-shaped member. Therefore, in the syringe 1, the second finger hooking portion 28 that functions as the operating force acting portion on the inner cylinder 2 is located on the front side of the second finger resting portion 24 on which the operating force acts on the outer cylinder 2. ..

【0018】

The guide portion 25 in the adapter main body 21 is thinner than the outer cylinder holding portion 23 and has an arc shape with a larger inner diameter. When the inner cylinder 3 is incorporated in the outer cylinder 2, the disc portion of the inner cylinder 3 is formed. The outer peripheral surface of the connecting main body 27 of the finger hook member 22 attached to 11 is accommodated. Here, both end faces of the guide portion 25 are guide surfaces 25a for guiding the second finger hook portion 28, and the arc thereof is the second finger hook when the finger hook member 22 attached to the inner cylinder 3 is accommodated. The portion 28 is pressed against these guide surfaces 25a so that the shaft portion 8 of the inner cylinder 3 has an angle that causes it to slightly bend. Therefore, the second finger hook portion 28 comes into sliding contact with the surface of the guide surface 25a of the guide portion 25 with a predetermined pressing force. Further, in a state where the finger hook member 22 is incorporated in the adapter body 21, the second finger hook portion 28 projects from the outer surface of the adapter body 21 to the left and right sides by a predetermined length. The guide surface 25a is formed with a locking recess 30 in which the finger hook member 28 attached to the disk portion 11 of the inner cylinder 3 is dropped at a position where the inner cylinder 3 is displaced to the suction stroke end. ..

【0019】

With the above configuration, the inner cylinder 3 is incorporated into the outer cylinder 2, and the piston portion 9 is arranged at the position where the inner cylinder 3 is pushed in most so as to be arranged at a position close to the end face provided with the cylinder tip 4. .. As a result, the fluid chamber partitioned by the piston portion 9 is not formed or becomes a small space. First, the finger hook member 22 is connected to the disk portion 11 of the inner cylinder 4 to the syringe 1. The finger hook member 22 is connected by inserting the disk portion 11 into the slit groove 29 formed in the connecting main body portion 27, and the connecting main body portion 27 has an arc with an angle slightly larger than 180 °. Therefore, the finger hook member 22 is held in the state of being incorporated in the inner cylinder 3 by the snap action action at the time of fitting.

【0020】

Next, the outer cylinder 2 is fitted to the outer cylinder holding portion 23 of the adapter main body 21. Even during this fitting, the outer cylinder holding portion 23 holds the portion on the base end side of the outer cylinder 2 by the snap action action, and the flange portion 7 is fitted into the slit groove 26. The second finger hook portion 28 of the finger hook member 22 attached to the inner cylinder 3 comes into contact with the guide surface 25 a of the guide portion 25. Then, when the outer cylinder 2 is completely fitted in the outer cylinder holding portion 23, the second finger hook portion 28 is pressed against the guide surface 25a, and the base end side of the shaft portion 8 is slightly bent upward. It will be in a bad state.

【0021】

In the above state, the suction passage 6 is connected to the luer lock mechanism 5 of the suction passage 6 and inserted into the body cavity through the endoscopic treatment tool insertion channel or the like to suck the body fluid. Manipulate syringe 1 to collect body tissue. In the suction operation by the syringe 1, the adapter main body 21 is arranged between the index finger and the middle finger, and these two fingers are brought into contact with the second finger hooks 28 protruding to the left and right of the adapter main body 21. Further, the thumb is brought into contact with the second finger contact portion 24 forming the base end surface of the adapter main body 21. Therefore, the syringe 1 attached to the adapter 20 can be stably held with these three fingers.

【0022】

Then, when the index finger and the middle finger are pulled toward the second finger rest 24 side where the thumb is in contact (or the thumb is pushed toward the second finger betting part 28 side), the second finger hook part is operated. 28 slides along the guide surface 25a of the guide portion 25, and as a result of the inner cylinder 3 being displaced in the direction of being pulled out from the outer cylinder 2, the volume of the fluid chamber in the outer cylinder 2 partitioned by the piston portion 9 is formed. Is expanded, and the fluid chamber is in a negative pressure state. Therefore, a negative pressure suction force acts in the suction passage 6, and body fluid, body tissue, and the like are drawn into the suction passage 6.

【0023】

When the second finger hook 28 is displaced to the position of the locking recess 30 formed on the guide surface 25a, that is, when it is moved to the suction stroke end position, the inner cylinder is in a bent state as shown in FIG. The second finger hook portion 28 is dropped into the locking recess 30 by the action of the elastic restoring force of the shaft portion 8 of 3. As a result, the inner cylinder 3 is fixed at that position, and the inner cylinder 3 is pulled back by the action of negative pressure in the fluid chamber, so-called springback does not occur, even if the second finger hook portion 28 and the second finger rest are used. Even if the operating force acting on the part 24 is released, it is stably held at that position. Therefore, the locking recess 30 functions as a stopper for holding the inner cylinder 3 at the suction stroke end position.

【0024】

As described above, the adapter 20 reverses the positions of the finger contact portion and the finger hook portion in the syringe for fluid pumping, and as a result, by operating in the same direction as during fluid pumping, that is, the inner cylinder 3 By bringing the thumb, index finger, and middle finger into contact with the operating force acting portion provided on the outer cylinder 2 and performing the same operation as during fluid pumping, the syringe 1 can exert a negative pressure suction force. Then, after performing this suction operation, the syringe 1 is separated from the adapter 20, only the syringe 1 is disposable, and the adapter 20 can be reused.

【0025】

Here, in order to prevent springback in which the inner cylinder 3 is pulled into the outer cylinder 2 due to the negative pressure acting on the inside of the outer cylinder 2 in the syringe 1 when the inner cylinder 3 is displaced to the suction stroke end position, The guide portion 25 of the adapter body 21 is configured to form a locking recess 30, but in addition to this, as shown in FIG. 5, for example, a locking arm piece 40 is provided in the second finger rest portion 24. It can also be configured to be installed continuously. The locking arm piece 40 projects from the second finger rest portion 24 onto the guide surface 25a of the guide portion 25, and the protrusion 40a is formed on the inner surface of the tip portion thereof. The distance between the protruding end of the protrusion 40a and the guide surface 25a is narrower than the diameter of the second finger hook 28, and the portion on the base end side of the protrusion 40a is the diameter of the second finger hook 28. Approximately the same size as, or slightly wider.

【0026】

Therefore, when the inner cylinder 3 is displaced to the suction stroke end position, the second finger hook portion 28 passes through the position of the protrusion 40a of the locking arm piece 40, and at this time, the locking arm piece 40 is elastically deformed. , Since the locking arm piece 40 is restored after passing through this second finger hook 28, the second finger hook 28 is restricted to this protrusion 40a, and the springback of the cylinder 3 is Be prevented. With this configuration, the second finger hook portion 28 does not need to be in sliding contact with the guide surface 25a, so that the movement becomes smooth.

【0027】

Further, as shown in FIG. 6, in the finger hook member 22, a circle having both ends fixed to the slit groove 29 into which the disc portion 11 of the inner cylinder 3 fits in the vicinity of the connecting portion with the second finger hook portion 28. An arc-shaped leaf spring 41 is attached, and the leaf spring 41 is arranged along the inner surface of the groove bottom of the slit groove 29, and a convex portion 41a is formed at the lower end portion thereof. The arc shape of the groove bottom of the slit groove 29 in this case is larger than the outer diameter of the disk portion 11, and the distance between the ends of both grooves in the slit groove 29 is smaller than the outer diameter of the disk portion 11. .. As a result, when the finger hook member 22 is connected to the disc portion 11 of the inner cylinder 3, the disc portion 11 does not separate from the finger hook member 22. Further, when the second finger hook portion 28 comes into contact with the guide surface 25a of the guide portion 25, the convex portion 41a of the leaf spring 41 bends so that the disc portion 11 is separated from the slit groove 29. Act on forces.

【0028】

As a result, in the configuration of FIG. 6, when the repulsive force due to the bending of the convex portion 41a of the leaf spring 41 acts to reach the position of the locking recess 30, that is, the suction stroke end position, the disc portion 11 is displaced. Instead, the finger hook member 22 is displaced downward by the urging force of the leaf spring 41, and the second finger hook portion 28 is dropped into the locking recess 30. Therefore, even if the finger hook member 22 is lowered in this way, the depth of the slit groove 29 is set so that the disc portion 11 is still located in the slit groove 29. With this configuration, the bending force does not act on the shaft portion 8 of the inner cylinder 3, so that the inner cylinder 3 can be smoothly moved.

【0029】

Next, FIGS. 7 and 8 show a second embodiment of the present invention, and FIG. 9 shows a modified example thereof. Also in this second embodiment, as the syringe, a syringe having the same configuration as that of the first embodiment described above, that is, a syringe 1 for fluid pumping is used.

【0030】

In these figures, 50 indicates an adapter, and in this adapter 50, an outer cylinder holding portion 51 is formed on one end side, and the other end side functions as a second operating force acting portion on the outer cylinder side. It is a finger pad 52. A slit groove 53 is formed in the outer cylinder holding portion 51, and the flange portion 7 of the outer cylinder 2 in the syringe 1 is engaged with the slit groove 53. The above points are not particularly different from the first embodiment. However, the connecting portion 54 that connects the outer cylinder holding portion 51 and the second finger contact portion 52 has a relatively narrow substantially rod shape. The width dimension of the connecting portion 54 is preferably made as small as possible from the diameter of the disk portion 11 in the inner cylinder 3. As a result, when the flange portion 7 of the outer cylinder 2 of the syringe 1 is assembled so as to engage with the outer cylinder holding portion 51, the disc portion 11 of the inner cylinder 3 is partially stretched from the side surface of the connecting portion 54. Will come out.

【0031】

Here, when the inner cylinder 3 is displaced with respect to the outer cylinder 2 in the pulling direction, the disk portion 11 provided on the inner cylinder 3 is kept in a non-contact state with the surface of the connecting portion 54. ing. A stopper 55 is formed at a predetermined position on the surface of the connecting portion 54. The stopper 55 has an inclined slope 55a that rises at a relatively loose angle, and a slope 55a that is formed at the end of the inclined slope 55a and descends at a substantially right angle (or at a predetermined angle) with respect to the surface of the connecting portion 54. It has a shape with a stopper wall 55b. Therefore, when the inner cylinder 3 is displaced with respect to the outer cylinder 2 to the vicinity of the suction stroke end, the disk portion 11 rides on the inclined slope 55a of the stopper 55, and as a result, the shaft portion 8 of the inner cylinder 3 becomes It will be bent in the direction of warping. Then, when the disc portion 11 passes through the inclined slope 55a, the disc portion 11 is in a straight state due to the elastic restoring force of the shaft portion 8, and as a result, the disc portion 11 comes into contact with the stopper wall 55b, and the inner cylinder 3 acts as a springback. Prevents it from being pulled into the outer cylinder 2. Therefore, the portion of the stopper 55 provided with the stopper wall 55b is the suction stroke end position of the inner cylinder 3.

【0032】

Even with the above configuration, the adapter 50 positions the operating force acting portion on the outer cylinder 2 on the proximal end side rather than the position of the disk portion 11 constituting the operating force acting portion on the inner cylinder 3 side. In other words, the positions of the operating force acting part on the inner cylinder 3 side and the operating force acting part on the outer cylinder 2 side are reversed, so that the syringe 1 used for fluid pumping functions as a suction syringe. be able to. Therefore, the thumb is brought into contact with the second finger contact portion 52 provided on the adapter 50, and the disc portion 11 of the inner cylinder 3 is held by the index finger and the middle finger, but at this time, the connecting portion 54 of the adapter 5 is also held at the same time. Suction is performed by the syringe 1 by sandwiching it between the index finger and the middle finger and operating the index finger and the middle finger so as to slide along the side surface of the connecting portion 54 in this state. In this way, when the finger is operated so as to move along the side surface of the connecting portion 54, no bending force or the like acts on the shaft portion 8 of the inner cylinder 3 during the suction operation, and the finger is pulled out straight from the outer cylinder 2. Moreover, when the suction stroke end is reached, the disk portion 11 rides on the inclined slope 55a of the stopper 55, and then when the stroke end position is reached, it engages with the stopper wall 55b, so that the operating force is released. The inner cylinder 3 is stably held in the state of being pulled out from the outer cylinder 2.

【0033】

By the way, in order to more reliably fix the inner cylinder 3 with the stopper, the height of the stopper from the surface of the connecting portion must be as high as possible. However, when the shaft portion 8 of the inner cylinder 3 is in a state of riding on the stopper, the contact area between the disc portion 11 and the stopper wall is not further increased. Therefore, as in the adapter 150 shown in FIG. 9, in the stopper 150 composed of the inclined slope 150a and the stopper wall 155b, a concave passage 155c through which the inner cylinder 3 passes is formed in the central portion thereof. As a result, when the disk portion 11 of the inner cylinder 3 comes into contact with the stopper wall 155b, the shaft portion 8 does not bend. Therefore, even if the width of the connecting portion 154 is narrowed so that the finger can sufficiently hang on the disk portion 11 during operation, it can be maintained in an extremely stable state at the suction stroke end position of the inner cylinder 3.

[Effect of the invention]

As described above, since the present invention has a configuration in which the positions of the operating force acting portions provided on the inner cylinder and the outer cylinder of the syringe are reversed, the syringe for fluid pumping is simpler and cheaper than the suction syringe. Can be converted into a suction syringe that can be smoothly and easily sucked by one-handed operation.

[Simple explanation of drawings]

[Figure 1]

It is an exploded perspective view which shows the adapter device which shows one Embodiment of this invention together with a syringe.

[Figure 2]

It is a top view of the state where the syringe is incorporated in the adapter device of FIG.

[Fig. 3]

It is XX sectional view of FIG.

[Fig. 4]

It is a cross-sectional view similar to FIG. 3 showing a state in which the inner cylinder is displaced with respect to the outer cylinder at the suction stroke end position.

[Fig. 5]

It is a main part block diagram which shows another example of the locking mechanism of the 2nd finger hook part at the suction stroke end position.

[Fig. 6]

Another example of the finger hook member is shown, and is a cross-sectional view along a slit groove in a state where a disk portion of an inner cylinder is engaged with the finger hook member.

[Fig. 7]

It is an external view of the state in which the syringe is incorporated in the adapter device which shows the 2nd Embodiment of this invention.

[Fig. 8]

It is a vertical sectional view of the adapter device of FIG.

[Fig. 9]

It is a block diagram which shows the modification of the stopper provided in the adapter device in the 2nd Example of this invention.

[Explanation of symbols]

1 Syringe 2 Outer cylinder 3 Inner cylinder 4 Cylinder tip 7 Flange part 8 Shaft part 9 Piston part 11 Disk part 20,50,150 Adapter 21 Adapter body 22 Finger hook member 23,51 Outer cylinder holder 24,52 Second finger pad 25 Guide 25a Guide surface 26,53 Slit groove 27 Main body for connection 28,52 Second finger hook 29 Slit groove 30 Locking recess 40 Locking arm piece 40a Protrusion 41 Leaf spring 41a Convex shape 54,154 Connection 55,155 Stopper 55a, 155a Inclined slope 55b, 155b Stopper wall 155c passage