Manual aspirator

Abstract

To provide a manual aspirator that achieves a state of retaining negative pressure of a syringe for a while only by drawing a control lever, and is improved so as to smoothly suck a poison solution while making an operation easier than a conventional one.SOLUTION: A manual aspirator R that includes a syringe 1 having a tip portion 1s and a base end portion 1k, and a suction opening at the tip portion side, a piston 2 existing in the lumen of the syringe 1, and a control lever 3 fixed to the lateral part of the piston 2 is configured such that the lateral part of the syringe 1 is provided with a guide opening part G1 for guiding the control lever 3 from the tip portion side to the base end portion side, and a holding opening part G2 adjacent to the guide opening part G1 in the circumferential direction of the syringe 1, and holding the control lever 3 at the base end portion side; and an edge portion 8a at the base end portion side of the guide opening part G1 is closer to the base end portion of the syringe 1 in a part nearer to the holding opening part G2.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a manual aspirator suitable for sucking out venom injected into an arm, leg, or the like due to an insect bite or the like. [Background technology]

[0002] While hiking, enjoying outings, or in daily life, we may be bitten by insects such as mosquitoes or bees. That is, we may be stung, bitten, or have our blood sucked by blood-sucking arthropods such as mosquitoes, black flies, fleas, and ticks, stinging arthropods such as bees, spiders, and centipedes, or snakes and leeches. As a medical device that can perform first aid in such cases relatively easily, a manual aspirator is known that can suck out venom components (hereinafter collectively referred to as venom) from saliva or venom injected into the arms or legs.

[0003] An example of a manual aspirator is the syringe-type aspirator disclosed in Patent Document 1. This aspirator is operated by pressing the suction opening at the tip of the piston (1) fitted inside the syringe chamber (5), which is the inner cavity of the cylinder (3), against the wound, and then gripping the pair of flanges of the cylinder (3) and the flat top of the push rod (4) with the fingers to pull and move the cylinder (3). The piston (1) is pushed out, and the negative pressure generated in the syringe chamber (5) allows the venom injected into the body to be sucked out of the wound.

[0004] Since the manual aspirator is designed to suck by the negative pressure generated in the syringe chamber (5), it is essential to keep the negative pressure applied for a while in order to effectively suck out the venom. In other words, in the manual aspirator disclosed in Patent Document 1, the cylinder (3) moved by the grip of the fingers is pulled back and stopped at the end position, that is, the gripping operation is continued, but in reality this is often not done well.

[0005] This is because it is actually quite difficult to smoothly perform multiple actions, such as the alignment operation of aligning the suction opening at the tip of the piston (1) with the wound, the suction operation of gripping the cylinder (3) and the extrusion rod (4) while maintaining that alignment, and the gripping maintenance operation of maintaining the negative pressure in the syringe chamber (5) by continuing to apply gripping force to prevent the cylinder (3) from moving back due to negative pressure. In particular, it is easy for the negative pressure to disappear as soon as the fingers relax without mastering the gripping maintenance operation that requires continuing to apply force.

[0006] Therefore, a manual aspirator has been developed that allows for the omission of the grip maintaining operation of maintaining the grip by the fingers, as disclosed in Patent Document 2. In the manual aspirator of Patent Document 2, a guide opening that guides the pulling movement path of a pair of operating levers (handles) integrated with the piston is formed in the syringe, and protruding openings that enable the operating levers to move in the circumferential direction of the syringe are formed on the left and right sides at the lower end of the guide opening in the lever pulling direction.

[0007] In other words, if the operating lever is pulled to the pulling end and then further moved in the circumferential direction to position it in the protruding groove, the operating lever will be maintained in the protruding opening even if the grip by the fingers is released, so that the negative pressure in the syringe can be maintained for a while. This function can also be understood from the description in the "Design Description" of Patent Document 2 that "there is a groove for fixing the pump handle when the user pulls up the pump handle."

[0008] However, it has been found that even the manual aspirator according to Patent Document 2, which allows the omission of the gripping maintenance operation, does not actually perform a good aspirating operation. The aspirating operation with the manual aspirator according to Patent Document 2 requires three actions: the positioning operation for aligning the tip opening of the syringe with the wound, the aspirating operation for pulling the operating lever with the fingers while aligned, and the twisting operation for rotating and moving the operating lever in a circumferential direction of the syringe different from the pulling direction at the pulling end position.

[0009] This replaces the gripping operation of the manual aspirator of the above-mentioned Patent Document 1 with a twisting operation, and relieves the user from the need to continue to exert force on the grip, but the three actions are still required in total. Therefore, when suffering from an insect bite or the like, it is often difficult to smoothly perform the three actions described above. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2006-84314 A [Patent Document 2] Design Registration No. 1667560 Summary of the Invention [Problem to be solved by the invention]

[0011] In conventional manual aspirators, the negative pressure maintenance operation, which requires additional effort after pulling the piston or operating lever, or the twisting operation, which requires moving the operating lever in a direction different from the direction of pulling it, are also necessary. In this way, the negative pressure maintenance operation and twisting operation are factors that make it difficult to aspirate venom, and there is room for further improvement in order to realize a manual aspirator that can aspirate venom successfully.

[0012] The object of the present invention is to provide an improved manual aspirator which, through structural innovation resulting from extensive research, realizes a state in which negative pressure in the syringe can be maintained for a while simply by pulling the operating lever, thereby making the operation easier than conventional products and enabling smooth aspirating of venom. [Means for solving the problem]

[0013] [1] The present invention relates to a manual aspirator R, A syringe 1 having a tip end 1s and a base end 1k and having a suction opening 1a on the tip end side; A piston 2 present in the inner cavity of the syringe 1; and an operating lever 3 fixed to the side of the piston 2, A guide opening G1 for guiding the operating lever 3 from the tip end side to the base end side and a holding opening G2 for holding the operating lever 3 on the base end side are provided on the side of the syringe 1, and the edge 8a on the base end side of the guide opening G1 is characterized in that the closer the edge 8a is to the holding opening G2, the closer it is to the base end of the syringe 1.

[0014] According to the present invention, the edge of the base end side of the guide opening is closer to the base end of the syringe 1 the closer it is to the holding opening, so when the operating lever guided by the guide opening is pulled toward the base end of the syringe and hits the edge, the operating lever is guided along the edge into the holding opening. In other words, simply by pulling the operating lever, the guiding action of the edge positions it in the holding opening, and the operating lever is held on the base end side of the syringe.

[0015] [2] The second invention is characterized in that, in the manual aspirator R described in [1], an inlet / outlet opening 10 is formed on the syringe base end side of the holding opening G2, opening toward the base end side of the syringe 1 and enabling the operating lever 3 to be inserted and removed.

[0016] [3] The third invention is characterized in that in the manual aspirator R described in [1] or [2], a raised wall portion 11 is provided on the edge 9b on the syringe tip side of the holding opening G2 to restrict the operating lever 3 located at the holding opening G2 from moving toward the front guide opening G1.

[0017] [4] The fourth invention is characterized in that in the manual aspirator R described in any one of [1] to [3], the operating lever 3 guided from the guide opening G1 to the holding opening G2 by an edge 8a on the base end side of the guide opening G1 is configured to rotate counterclockwise relative to the syringe 1 when viewed in a direction from the base end side to the tip end side of the syringe 1.

[0018] [5] The fifth invention is characterized in that, in the manual aspirator R described in any one of [1] to [4], the operating lever 3, the guide opening G1, and the holding opening G2 are also provided on opposite radial sides of the syringe 1, and the guide opening G1 and the holding opening G2 on one side, and the guide opening G3 corresponding to the guide opening G1 on one side and the holding opening G4 corresponding to the holding opening G2 on one side have left-right inverted shapes to each other in a side view of the syringe 1.

[0019] [6] The sixth aspect of the present invention is the manual aspirator R according to [5], characterized in that each of the operating levers 3, 3 is formed with an insertion hole 3b for passing a finger therethrough. Effect of the Invention

[0020] According to the manual aspirator of the present invention, when the lever guided by the guide opening is pulled toward the user, the operating lever moves to the holding opening and can be held in a position on the base end side of the syringe. This eliminates the need for gripping and twisting operations required with conventional products, and basically requires only two actions: aligning the lever with the wound and pulling the lever toward the user.

[0021] As a result, it is possible to provide an improved manual aspirator that can maintain the negative pressure in the syringe for a while simply by pulling the operating lever, and that allows for smooth aspirating of venom while being easier to operate than conventional products. [Brief description of the drawings]

[0022] [Figure 1]FIG. 2 is a front view and a plan view showing the manual aspirator of the present invention; [Diagram 2] Side view of the manual aspirator shown in Figure 1 [Diagram 3] FIG. 2 is a cross-sectional view of the manual aspirator shown in FIG. 1 taken along line AA of FIG. [Figure 4] A perspective view of a syringe seen from diagonally above [Diagram 5] A perspective view of the piston seen from diagonally above [Figure 6] FIG. 1 is an enlarged side view of a main part showing the guide opening of a syringe. [Figure 7] Schematic diagram showing an example of using a manual aspirator DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the embodiment of the manual aspirator according to the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the illustrated examples, and can be modified within the scope of the above and below, and all such modifications are included in the technical scope of the present invention. Also, the dimensions, shapes, and ratios of each part in the drawings may not necessarily be the same as the actual ones. Some manual aspirators of this type are commercially available and are called poison removers or insect poison removers, but here we will call them manual aspirators.

[0024] As shown in Figures 1 to 3, the manual aspirator R has an open cylindrical syringe 1 having a tip end 1s and a base end 1k with a suction opening 1a on the tip side, a piston 2 located in the inner cavity of the syringe 1, and a pair of operating levers 3, 3 fixed to the sides of the piston 2, and is preferably configured to have a base end cap 4 fitted onto the base end of the syringe 1, a tip cap 5 fitted onto the tip of the syringe 1, and a seal ring 6 fitted onto the outside of the piston 2.

[0025] A pair of operating levers 3, 3 for finger operation are formed in a point-symmetrical shape with respect to the central axis P of the syringe 3, extending in opposite directions to each other, and projecting laterally from the syringe base end side of the piston 2. A pair of guide openings G, G penetrating the outer peripheral wall 1A of the syringe 1 in the direction of the central axis P, i.e., from the center in the longitudinal direction of the syringe to the base end 1k side, are formed, and a lever base portion 3A of each operating lever 3 is fitted into each of the guide openings G.

[0026] Here, a brief description will be given of an example of how to use the manual aspirator R. As shown in Fig. 7, the tip cap 5 is placed so as to cover a wound (not shown) such as an insect bite on the forearm Hf of the left arm, and the thumb oy of the right hand rH placed on the base cap 4 is grasped with the index finger hy and middle finger ny inserted through the insertion holes 3b, 3b (see Fig. 1) of each operating lever 3, 3, and each operating lever 3, 3 is pulled toward the base end side (user side) of the syringe 1 as indicated by the white arrows in Fig. 7. Fig. 7 shows a midway state of the operation of pulling the operating levers 3, 3, and the venom can be sucked out of the wound by the negative pressure generated in the syringe chamber 1D (see Fig. 3), which is the inner cavity of the syringe 1. Next, each part will be described.

[0027] [Syringe] As shown in FIG. 1 to FIG. 4, the syringe 1 having a tip portion 1s, a base end portion 1k, and a central axis P has an outer peripheral wall 1A, a tip wall 1B, and an intake wall 1C formed on the tip wall 1B, and a pair of guide openings G, G are formed from the longitudinal center of the outer peripheral wall 1A to the base end side. The intake wall 1C, which is cylindrical and has a short length in the direction of the central axis P, extends from the tip wall 1B of the tip portion 1s to the base end 1k side, i.e., the base end side of the syringe, and an opening 1a is formed at the tip of the intake wall 1C. The tip wall 1B has a flat tip surface 1b that is circular when viewed in the direction of the central axis P, and the center of the tip surface 1b is the opening 1a. It is preferable that the length of the intake wall 1C in the direction of the central axis P is set to be 2 to 3 times the thickness of the tip wall 1B. The direction of the central axis P of the syringe 1 and the longitudinal direction of the syringe 1 are the same direction.

[0028] As shown in Fig. 3, the outer diameter of the tip portion 1s, which is the portion where the tip cap 5 is detachably fitted from the outside, is set to a dimension where the outer peripheral wall 5A of the tip cap 5 is fitted from the outside, for example, by light press-fitting, and the inner diameter of the suction port wall 1C is set to a dimension where the inner cylindrical portion 5C of the tip cap 5 is fitted from the inside, for example, by light press-fitting. The base end side of the syringe 1 is open (see Fig. 4), and the base end portion 1k is closed by the base end cap 4 which is detachably fitted from the outside, for example, by light press-fitting. The inner diameter of the syringe 1 is set to a state where the seal ring 6 made of an elastic material which is fitted from the outside of the piston 2 is fitted from the inside without any gap, for example, a dimension where it is lightly pressed. The syringe 1 is preferably made of a synthetic resin such as PP or PE, but is not limited to this.

[0029] 2, 4, and 6, a pair of guide openings G, G for guiding a lever movement path W accompanying the pulling of the levers 3, 3 toward the syringe base end side are formed in the outer peripheral wall 1A of the syringe 1 in a state of point symmetry with respect to the central axis P. Each guide opening G has guide openings G1, G3 for guiding the operating lever 3 toward the tip portion 1s side, i.e., from the syringe tip side to the syringe base end side, and holding openings G2, G4 adjacent to the guide opening G1 in the circumferential direction of the syringe 1 and for holding the operating lever 3 on the syringe base end side. The guide openings G may also have an inlet / outlet opening 10.

[0030] In other words, the operating lever 3, guide opening G1, holding opening G2, and inlet / outlet opening 10 are also provided on the opposite radial side of the syringe 1, and the guide opening G1, holding opening G2, and inlet / outlet opening 10 on one side, and the guide opening G3 corresponding to the guide opening G1 on one side, and the holding opening G4 and inlet / outlet opening 10 corresponding to the holding opening G2 on the other side have left-right inverted shapes relative to each other when viewed from the side of the syringe 1.

[0031] Regarding the configuration of the guide opening G, one of the guide openings G will be described. As shown in Figs. 4 and 6, the guide opening G has a guide opening G1 that linearly guides the operating lever 3 from the tip end 1s side, i.e., the syringe tip side to the syringe base end side, and a holding opening G2 that is adjacent to the guide opening G1 in the circumferential direction of the syringe 1 and holds the operating lever 3 on the syringe base end side. The guide opening G1 has a relatively long straight linear opening 7 that extends from the central region in the longitudinal direction of the syringe 1 to the syringe base end side, and an inclined opening 8 that continues to the syringe base end side of the linear opening 7. The linear opening 7 has a left linear edge 7a along the central axis P, a right linear edge 7b along the central axis P, and a tip edge 7c.

[0032] The inclined opening 8 is a wide opening continuing to the syringe base end side of the straight opening 7, and is provided with an inclined edge 8a that is inclined at an angle q, for example, 50 to 60 degrees, to the extension line of the left straight edge 7a toward the syringe base end side and in one direction in the syringe circumferential direction, i.e., the upper right direction in FIG. 6, at a state where the inclined edge 8a smoothly continues to the left straight edge 7a on the outer peripheral wall 1A that is downstream in the pulling movement direction of the lever 3. That is, the edge 8a on the base end side of the guide opening G1 is formed as an inclined edge 8a that is inclined at a constant angle, for example, closer to the base end 1k (base end of the syringe 1) of the syringe 1 as it approaches the holding opening G2. The angle q of the inclined edge 8a is preferably 60 to 70 degrees or 65 to 75 degrees from the viewpoint of shortening the length of the inclined edge 8a in the syringe longitudinal direction, and is preferably 40 to 50 degrees or 45 to 60 degrees from the viewpoint of smoother pulling.

[0033] The upstream side of the inclined opening 8 in the direction of pulling movement, i.e., the edge portion continuing to the right straight edge 7b on the syringe tip side of the inclined opening 8, is formed into a following edge portion 8b that is inclined at an angle p, for example 35 to 50 degrees, to the right straight edge portion 7b toward the syringe base end side and in one direction in the syringe circumferential direction, i.e., toward the upper right in Fig. 6. The angle p may be 35 degrees or less or 50 degrees or more, and it is preferable that the angle corresponds to the angle q of the inclined edge portion 8a so that the lever base portion 3A can move obliquely at the inclined opening 8.

[0034] The holding opening G2 is formed on one side of the guide opening G1 in the circumferential direction of the syringe, i.e., on the right side in Fig. 6, more specifically, on the outer peripheral wall 1A contiguous to the right side of the inclined opening 8, and has a straight edge 9a along the central axis P and a receiving edge 9b on the tip side. The receiving edge 9b is preferably a flat edge along a direction perpendicular to the central axis P, and is a portion that prevents the operating lever 3 (see Figs. 1 and 3) from moving toward the tip side of the syringe.

[0035] The inlet / outlet opening 10 is a short, linear opening that extends from the holding opening G2 towards the syringe base end and penetrates the base end of the syringe 1, and is a notched opening for inserting and removing the lever base portion 3A (see FIGS. 1 and 3) into and from the guide opening G. The inlet / outlet opening 10 is essentially an opening that continues into the inclined opening 8, and in the use state where the base end cap 4 (see FIGS. 1 and 2) is attached to the base end 1k, the inlet / outlet opening 10 is almost entirely or entirely covered by the outer peripheral wall 5A of the base end cap 4.

[0036] A raised wall 11 is formed on the outer peripheral wall 1A between the receiving edge 9b located on the syringe tip side of the holding opening G2 and the following edge 8b, and protruding from the receiving edge 9b slightly (e.g., 0.3 to 1 mm) toward the syringe base end side. The raised wall 11 has a restricting edge 11a that rises from the left end of the receiving edge 9b, which is the end on the guide opening G1 side, toward the syringe base end side, and a protruding edge 11b that is located between the restricting edge 11a and the following edge 8b in a flat state perpendicular to the central axis P. The length of the receiving edge 9b in the syringe circumferential direction is preferably set to a dimension such that the lever base 3A (see FIGS. 1 and 3) fits between the straight edge 9a and the restricting edge 11a without any gap, for example, without or almost without any rattling in the syringe circumferential direction.

[0037] At the base end of base portion 1k of syringe 1, an outer peripheral flange 1f is formed by slightly (e.g., 0.1 to 0.3 mm) increasing the thickness of outer peripheral wall 1A radially outward, thereby improving the strength and rigidity of the base end of syringe 1. The portion of the inner cavity of syringe 1 between tip wall 1B and linear opening 7 is syringe chamber 1D, which is the effective stroke region of piston 2, more specifically, O-ring-shaped seal ring 6 (see FIG. 3).

[0038] [piston] 1 to 3 and 5, the piston 2 in the cavity of the syringe 1 has a piston body 2A, a piston head portion 2B which is the portion of the piston body 2A on the syringe tip side, and a pair of left and right operation levers 3, 3 which are integrated with the piston body 2A on the syringe base end side. The piston body 2A has a base end side disc 12 on the syringe base end side, a tip end side disc 13 on the syringe tip side, and first and second vertical plates 14, 15 which connect these two discs 12, 13. The first vertical plate 14 and the second vertical plate 15 are integrated so that a cross section cut along a plane perpendicular to the central axis P has a cross shape.

[0039] The piston head portion 2B has a small diameter cylinder portion 16 continuing from the tip side disc 13 to the syringe tip side, and an outer peripheral flange 17 continuing from the small diameter cylinder portion 16 to the syringe tip side. A seal ring 6 is fitted into an outer peripheral groove 18 formed by the outer peripheral flange 17, the tip side disc 13, and the small diameter cylinder portion 16 (see FIG. 3). A recessed hole 23 is formed in the end portion of the piston 2 on the syringe tip side to avoid interference with the suction port wall 1C of the syringe 1 when the outer peripheral flange 17 is in contact with the tip wall 1B. The first and second discs 12 and 13, the outer peripheral flange 17, and the first and second vertical plates 14 and 15 preferably have the same outer diameter, and are preferably fitted into the syringe 1 so as to be able to move smoothly relative to the syringe 1, for example, loosely fitted.

[0040] [Operation lever] As shown in Figs. 1 to 3 and 5, the left and right operating levers 3 are formed so as to continue to the syringe base end side of the first vertical plate 14 of the piston 2 and the base end side disc 12. To explain the configuration of the operating lever 3 for one operating lever 3, the operating lever 3 has a lever base portion 3A that has the same thickness as the first vertical plate 14 and protrudes radially outward from the first vertical plate 14, and a lever body portion 3B that has an insertion hole 3b for passing a finger and continues to the lever base portion 3A. It is preferable that the length of the lever base portion 3A in the syringe longitudinal direction is as short as possible while providing the necessary strength and rigidity. If the length of the lever base portion 3A in the syringe longitudinal direction is short, it is desirable to shorten the length of the guide opening G in the syringe longitudinal direction and expand the volume of the syringe chamber 1D.

[0041] The lever base portion 3A is the portion that passes through the guide opening G of the syringe 1, has a thickness slightly smaller than the opening width of the linear opening portion 7, i.e., the circumferential width, and is a portion that is very short in left-right length, i.e., the radial length of the syringe 1. The lever body portion 3B has a rectangular shape with three rounded corners in a front view, and is preferably set to be thicker than the lever base portion 3A. To increase the thickness, a means for increasing the thickness in one or / and both thickness directions is considered. At the corner of one operating lever 3 on the syringe tip side at the radial outside of the syringe 1, a small hole 19 through which a strap or the like can be passed is formed outside the insertion hole 3b.

[0042] As shown by the imaginary lines in FIG. 5, it is preferable to provide recesses 3h at four corners (four corners) on the outside of the insertion hole 3b of the lever body 3B. By forming the recesses 3h, the thickness of that portion can be reduced, and it is possible to restrict or prevent air from entering during manufacturing. It is preferable to form the recesses 3h at three corners (three corners) other than the portion of the small hole 19 of the other lever body 3B (not shown), forming them in a total of seven places, but they may be formed at any of 1 to 7 places. Furthermore, the recesses 3h may be formed only on one surface of the lever body 3B, or may be formed on both the other surface.

[0043] The end of the lever base portion 3A on the syringe base end side and the end of the lever body portion 3B on the syringe base end side are located at the same position in the syringe longitudinal direction (see FIG. 1). In order to make the insertion hole 3b have a diameter that allows a finger to pass through easily, it is preferable to set the length of the lever body portion 3B in the syringe longitudinal direction to 2 to 4 times the length of the lever base portion 3A in the syringe longitudinal direction. It is also preferable to set the inner end of the lever body portion 3B in the syringe radial direction and the outer peripheral wall 1A of the syringe 1 in a state where they face each other with a small gap, which contributes to making the left and right operating levers 3, 3 as a whole more compact in left and right length.

[0044] [Base end cap] 1 to 3, the base end cap 4 fitted to the base end of the syringe 1 has a cap outer peripheral wall 4A fitted from the outside to the base end 1k, a flat ceiling wall 4B smoothly continuing to the cap outer peripheral wall 4A, and an inner peripheral wall 4C formed slightly spaced radially inward from the cap outer peripheral wall 4A. The cap outer peripheral wall 4A extends beyond the outer peripheral flange 1f toward the syringe tip side, and it is convenient that the inner peripheral wall 4C is fitted radially inward of the outer peripheral flange 1f portion at the base end 1k.

[0045] 6, in an assembled state in which the base end cap 4 is fitted onto the base end 1k of the syringe 1, the cap outer peripheral wall 4A surrounds the inlet / outlet opening 10, and the lower edge of the cap outer peripheral wall 4A, i.e., the tip edge 4a, essentially defines the upper end of the holding opening G2, i.e., the base end side end of the syringe. That is, as will be described in detail later, when the operating lever 3 is pulled toward the base end side of the syringe, the lever root portion 3A, which is guided toward the base end side and in the syringe circumferential direction by the inclined edge portion 8a, abuts against the tip edge 4a, and the lever root portion 3A is guided so as to move toward the holding opening G2 without entering the inlet / outlet opening 10.

[0046] [Tip cap] 1 to 3, the tip cap 5 has an outer peripheral wall 5A that can be fitted onto the tip 1s of the syringe 1, a bottom wall 5B that faces the tip wall 1B, and an inner cylinder 5C formed at the center of the bottom wall 5B. The outer peripheral wall 5A is preferably gradually thickened toward its opening side (the base end side of the syringe in FIG. 3), and is more preferably provided with a flange 5f that protrudes radially outward at the opening end. The inner cylinder 5C has an outer diameter that allows it to be fitted, preferably lightly pressed, into the suction port wall 1C, has a through hole 20 that penetrates in the longitudinal direction of the syringe 1, and is formed to protrude from the bottom wall 5B on the opposite side to the outer peripheral wall 5A.

[0047] Although not shown in the drawings, it is preferable that the inner diameter of the outer peripheral wall 5A of the tip cap 5 is a tapered inner peripheral surface (conical surface) that gradually decreases toward the through hole 20 in the longitudinal direction of the syringe 1. For example, the angle with respect to the central axis P is 0.5 to 4.0 degrees, preferably 0.5 to 2.0 degrees or 0.5 to 1.0 degrees. Alternatively, the inner diameter difference of the outer peripheral wall 5A may be about 1 to 2.0 mm or 0.5 to 1.5 mm. This configuration has the advantages that the tip cap 5 can be easily attached to the syringe tip portion 1s, and the more the tip cap 5 is pressed, the more a pressing force is applied to the syringe tip portion 1s.

[0048] The tip cap 5 can be configured to have a selectable setting between a standard specification (see Figs. 1 to 3) in which the outer peripheral wall 5A is fitted externally onto the tip 1s of the syringe 1 so that the inner cylindrical portion 5C protrudes further toward the tip, and an expanded diameter specification (see Fig. 7) in which the inner cylindrical portion 5C is fitted internally onto the suction port wall 1C of the syringe 1 so that the outer peripheral wall 5A protrudes further toward the tip. For example, when the wound is small, the standard specification allows the venom to be sucked out well from the relatively small through hole 20, while when the wound is somewhat large or covers a wide area, the expanded diameter specification allows the venom to be effectively sucked out over a wide area inside the outer peripheral wall 5A.

[0049] It is preferable if the length of the hole (not shown) in the suction port wall 1C in the longitudinal direction of the syringe is the same as the length of the protrusion of the inner cylinder 5C from the bottom wall 5B, but this is not limited to this. Although not shown in the figures, the manual aspirator R can also be used in such a way that the tip cap 5 is removed from the tip 1s and the tip wall 1B of the syringe 1 is placed directly against the wound to aspirate the venom through the suction opening 1a.

[0050] [Manual Aspirator Operation Explanation] In the manual aspirator R according to the present invention, the lever roots 3A, 3A can be moved from the guide openings G1, G3 to the holding openings G2, G4 simply by pulling the operating levers 3, 3 toward the syringe base end. That is, in the actual use shown in Fig. 7, when the operating levers 3, 3 are pulled toward the syringe base end with the lever roots 3A at the most distal end side of the linear opening 7, the lever roots 3A are guided by the inclined edge 8a at the proximal end side of the guide openings G1, G3, and the operating levers 3, 3 move in the circumferential direction of the syringe 1 by themselves to the holding openings G2, G4. Therefore, when the operating levers 3, 3 are released from the grip of the fingers while they are at the holding openings G2, G4, the negative pressure generated in the syringe chamber 1D causes the operating levers 3, 3 to move very slightly toward the syringe tip end, and the lever roots 3A, 3A come into contact with the corresponding receiving edge 9b and stop.

[0051] The relationship between the lever base 3A and the guide opening G will be described in detail for one operating lever 3 with reference to Fig. 6. First, before the operating lever 3 starts to be pulled in, the lever base 3A shown by the imaginary line is located on the syringe-end side of the linear opening 7. When the operating lever 3 is pulled toward the syringe base end, the lever base 3 guided by the linear opening 7 of the guide opening G1 moves along a straight path w1 in the syringe longitudinal direction until it hits the inclined edge 8a, that is, to the position shown by the solid line in Fig. 6.

[0052] The lever base 3A continues to be drawn toward the base end of the syringe, and is guided by contacting the inclined edge 8a, so that it moves obliquely along a diagonal path w2 that faces the base end of the syringe and in the circumferential direction of the syringe. The lever base 3A, guided along the diagonal path w2, moves in the circumferential direction of the syringe and reaches the holding opening G2, and comes into contact with the distal edge 4a and the linear edge 9a of the base end cap 4 on the base end side of the syringe, so that it cannot move any further toward the base end of the syringe. That is, the drawing of the operating levers 3, 3 by the fingers is essentially completed.

[0053] When the grip of the fingers is released after the retraction is completed, the negative pressure in the syringe chamber 1D causes the piston 2, i.e., the lever base 3A, to be pulled back slightly toward the syringe tip side along the return path w3, which is a straight path in the holding opening G2, and the lever base 3A comes into contact with the receiving edge 9b and stops. That is, the lever base 3A is maintained in the holding opening G2. In other words, with only one action of pulling the operating levers 3, 3 toward the base end of the syringe, the operating levers 3, 3 can be kept held in the holding opening G2, which is the area where the retraction is completed, so that the negative pressure state in the syringe chamber 1D can be maintained for a while, and the venom can be smoothly and continuously sucked in. The length of the return path w3 is preferably short in order to maintain the negative pressure at the end of the retraction of the operating levers 3, 3 as long as possible.

[0054] As shown in Fig. 6, the lever movement path W of the lever base portion 3A accompanying the pulling of the operating lever 3 includes a straight path w1 guided by the straight opening portion 7, an oblique path w2 guided by the inclined edge portion 8a, and a return path w3 guided by the straight edge portion 9a of the holding guide portion G2. As shown in Fig. 1, the operating lever 3 is pulled straight toward the base end side of the syringe by the guide opening portion G1, and is twisted in the syringe circumferential direction relative to the syringe 1 by the inclined edge portion 8a at the terminal end portion of the guide opening portion G1. Therefore, when viewed in the direction from the base end side to the tip end side of the syringe 1, the operating lever 3 is configured to rotate counterclockwise by an angle d relative to the syringe 1 as it is pulled toward the base end side of the syringe (see the operating lever 3 shown by the imaginary line in Fig. 1).

[0055] 7, when the manual aspirator R is actually used, two fingers hy and ny pass through the left and right operating levers 3, 3 and are difficult to rotate about the central axis P of the syringe 1, so that the syringe 1 actually rotates clockwise at an angle d relative to the operating levers 3, 3. The rotation angle d is preferably 25 to 35 degrees, but may be less than 25 degrees or greater than 35 degrees as long as the operating lever 3 can be moved to and held in the holding opening G2 when it is pulled.

[0056] A return restriction mechanism is provided in which the lever base 3A, which is in contact with the receiving edge 9b and located in the holding opening G2, is restricted from moving in the circumferential direction of the syringe by the presence of the raised wall 11 and its restricting edge 11a. After the operating levers 3, 3 are pulled, the lever base 3A is pressed against the receiving edge 9b by the negative pressure of the syringe chamber 1D, so that it is unlikely to move in the circumferential direction of the syringe by climbing over the raised wall 11 against the biasing force. Therefore, the return restriction mechanism having the raised wall 11 provides the advantage that the holding action of the lever base 3A at the holding opening G2 is more reliably maintained, i.e., the negative pressure of the syringe chamber 1D is more reliably maintained for a while.

[0057] The position of the tip edge portion 4a of the base end cap 4 may be a position closer to the base end side of the syringe than the position shown in Fig. 6. In this case, the lever base portion 3A drawn toward the base end side of the syringe will be slightly inserted into the inlet / outlet opening 10, but when the grip of the fingers is released, it can move smoothly toward the tip side of the syringe through the return path w3 of the holding opening G2. Also, the position may be closer to the tip side of the syringe than the position shown in Fig. 6. In this case, the lever base portion 3A drawn toward the base end side of the syringe will abut against the tip edge portion 4a just before the end of the inclined edge portion 8a, but due to the inertia of the syringe circumferential movement by the inclined edge portion 8a, the syringe circumferential movement continues even after abutting against the tip edge portion 4a, and the lever will move smoothly to the holding opening G2.

[0058] As described above, the side of the syringe 1 is provided with the guide opening G1 for guiding the operating lever 3 from the tip end 1s side to the base end 1k side, and the holding opening G2 adjacent to the guide opening G1 in the circumferential direction of the syringe 1 for holding the operating lever 3 on the base end 1k side, and the edge 8a on the base end side of the guide opening G1 is closer to the base end 1k of the syringe 1 as it approaches the holding opening G2. Therefore, the lever root 3A drawn to the base end side of the syringe is also guided in the circumferential direction of the syringe by the edge 8a on the base end side, so that the lever root 3A can be moved to and held in the holding opening G2 and the operating lever 3 can be held in the gripping end area by simply gripping the base end cap 4 and the fingers passing through the left and right insertion holes 3b, 3b. In other words, a manual aspirator that can effectively suck up venom by continuously applying negative pressure to the wound is realized by two actions: the operation of applying the tip cap 5 to the wound and the operation of pulling the operating levers 3, 3.

[0059] The manual aspirator of the present invention is excellent in that it can effectively suck up venom while maintaining a negative pressure state by simply pulling the operating levers 3, 3 together after aligning the inner tubular portion 5C or the outer circumferential wall 5A of the tip cap 5 with the wound. In other words, it can be said that a holding mechanism is provided that can hold the lever 3 in the movement end region (holding opening G2) of its movement range as the lever 3 is pulled. Therefore, the manual aspirator is almost always used by the person who has suffered an insect bite, and even if the manual aspirator R is used in a state of unsettled mind, such as in a hurry to suck out the venom quickly, it can smoothly and effectively suck up venom.

[0060] Since an entry / exit opening 10 that opens toward the base end of the syringe 1 and allows the operating lever 3, i.e., the lever base portion 3A, to be inserted and removed is formed on the base end side of the holding opening G2, the base end cap 4 can be removed and the operating levers 3, 3 with the piston 2 can be smoothly positioned from the base end side of the syringe through the left and right entry / exit openings 10, 10 into the guide opening G. Also, by attaching the base end cap 4 to the syringe 1, the entry / exit openings 10, 10 are essentially eliminated, which has the advantage of preventing the operating levers 3, 3 from coming off.

[0061] Due to the guiding action of the inclined edge 8a, as the operating levers 3, 3 are pulled, the operating levers 3, 3 rotate counterclockwise relative to the syringe 1 in a plan view (see Fig. 1), but as shown in Fig. 7, the two fingers hy and ny are inserted into the corresponding insertion holes 3b, 3b and are therefore unlikely to come off the operating levers 3, 3. Therefore, it is preferable that the gripping operation can be continued reliably with the thumb oy of the base end cap 4 and the index finger hy and middle finger ny inserted into the respective insertion holes 3b, 3b.

[0062] [Another embodiment] (1) The shape of the edge 8a on the base end side of the guide opening G1 can be various, such as a shape that is linearly inclined in side view like the inclined edge 8a, a circular arc shape, a curved shape such as a convex lens or a concave lens, an S-shape, etc. The angle q of the inclined edge 8a can also be changed as desired. In addition, the position of the boundary between the inclined edge 8a and the left straight edge 7a can be changed in the longitudinal direction of the syringe, such as by moving it closer to the tip end side of the syringe. In addition, the inclined edge 8a may be an edge that extends in the circumferential direction of the syringe in the opposite direction to the direction shown in FIG. 6, and in that case, the operating levers 3, 3 rotate clockwise relative to the syringe 1 as they are pulled toward the base end side of the syringe.

[0063] (2) The cross-sectional shape of the lever base portion 3A may be a rectangle (see FIG. 6), a rounded rectangle elongated in the longitudinal direction of the syringe, or other shapes. When the end of the syringe in the longitudinal direction is a rounded rectangle, there is an advantage that the opening width of the portion where the lever base portion 3A moves obliquely in the circumferential direction of the syringe, such as the syringe base end side of the guide opening G1 (inclined opening 8), can be shortened. In addition, if the receiving edge portion 9b is a semicircular shape that is recessed toward the syringe tip end side in accordance with the rounded rectangle of the lever base portion, the return restriction mechanism function, i.e., the function of restricting the lever base portion from returning to the guide opening G1, can be conveniently performed without separately providing the raised wall portion 11.

[0064] (3) As shown by the virtual line in Fig. 6, the guide opening G may be a crank-shaped guide opening G1 in which the portion of the straight opening 7 on the syringe tip side is replaced with a start opening 21 offset toward the holding opening G2 in the syringe circumferential direction and a swing opening 22 having a return inclined edge 22a inclined in the opposite direction to the inclined edge 8a. In this configuration, the relative positions of the operating levers 3, 3 and the syringe 1 in the syringe circumferential direction can be the same or close to each other at the start and end of pulling the operating levers 3, 3. [Explanation of symbols]

[0065] 1 syringe 1a Suction opening 2 Pistons 3 Operating lever 3b Insertion hole 8a Edge on the base end side: Sloping edge 9b Edge of the syringe tip: Receiving edge 10 Entrance / exit opening 11 Raised wall G1 Guide opening G2 retention opening G3 Other guide opening G4 Other retaining opening R Manual suction device

Claims

1. a syringe having a tip end and a base end and having a suction opening on the tip end side; a piston residing in the lumen of the syringe; an operating lever fixed to a side of the piston, a guide opening for guiding the operating lever from the tip end side to the base end side, and a holding opening for holding the operating lever on the base end side, the holding opening being adjacent to the guide opening in the circumferential direction of the syringe, a sloped opening is provided at an end of the guide opening on the base end side, the sloped opening guiding the operating lever obliquely toward the base end side and in a circumferential direction of the syringe, and the edge of the sloped opening on the base end side is closer to the base end of the syringe the closer it is to the holding opening in the circumferential direction of the syringe.

2. 2. The manual aspirator according to claim 1, wherein an inlet / outlet opening is formed on the syringe base end side of the holding opening, the inlet / outlet opening opening opening toward the base end side of the syringe and allowing the operating lever to be inserted and removed.

3. 2. The manual aspirator according to claim 1, wherein a raised wall portion is provided on an edge portion of the holding opening on the syringe tip side, the raised wall portion extending toward the syringe base end side, in order to restrict the operation lever located at the holding opening from moving toward the guide opening.

4. 2. The manual aspirator according to claim 1, wherein the operating lever, which is guided from the guide opening to the holding opening by an edge portion on the base end side of the guide opening, is configured to rotate counterclockwise relative to the syringe when viewed in a direction from the base end side to the tip end side of the syringe.

5. 5. The manual aspirator according to claim 1, wherein the operating lever, the guide opening, and the holding opening are also provided on opposite radial sides of the syringe, and the guide opening and the holding opening on one side, and the guide opening and the holding opening on the other side corresponding to the guide opening on one side, and the holding opening on the other side corresponding to the holding opening on one side have left-right inverted shapes relative to each other in a side view of the syringe.

6. 6. The manual aspirator according to claim 5, wherein each of said operating levers is formed with an insertion hole for passing a finger therethrough.

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