JP4039876B2 - Chemical injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chemical liquid injector for injecting a chemical liquid into a living body.
[0002]
[Prior art]
For example, as a chemical solution injector used when a diabetic patient performs insulin injection by himself, a pen-type injector is put into practical use in addition to a simple injector type. This pen-type injector is provided with an injection needle at the distal end portion and an injection button at the proximal end portion. When the injection button is pressed, the drug solution is discharged from the injection needle. The method of using this pen-type injector will be described by taking the case of injection into the abdomen as an example.
[0003]
First, the skin near the puncture site is picked up with the left hand (non-dominant hand) to form a subcutaneous pocket. Next, hold the pen-type injector with the right hand (dominant hand) as if writing, and puncture the injection needle into the subcutaneous pocket. Next, the pen-type injector is changed to a way of holding the iron bar and the injection button is pushed with the thumb to inject the drug solution.
[0004]
As described above, in the conventional pen-type injector, it is necessary to change how to hold (grip) during the injection operation, and the operation is complicated. In addition, since the injection needle is punctured, the user feels fear. In addition, the left hand picks up the skin and cannot be used because it must be done with one hand, so it is difficult to change the position of the left hand. Or dropped the injector by mistake. To avoid this change, it is possible to puncture with the grip of the right hand thumb from the injection button from the beginning. there were.
[0005]
In addition, when a patient with weak grip is used, it is difficult to push the injection button with the finger, and the liquid injection operation is not easy.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a drug solution injection device that does not need to be changed after puncturing an injection needle, is easy to operate, and can safely and easily inject a drug solution into a living body.
[0007]
[Means for Solving the Problems]
  Such purposes are as follows (1) to(10)This is achieved by the present invention.
[0008]
  (1) A chemical container having a cylindrical body filled with a chemical liquid and a gasket that slides in a liquid-tight manner in the cylindrical body is loaded, and a needle tip that pierces the chemical liquid container at one end and a living body at the other end. Used with an injection needle that has a needle tip pierced throughAnd
  An apparatus body having a container loading section for loading the chemical liquid container, and a pressing mechanism for pressing and moving the gasket;
  Provided at the end of the device body, provided with a contact portion that is displaced by the pressing force when pressed against the surface of the living body and can return to the original position when the pressing force is released,
  When the injection needle is punctured into the living body and the contact portion is pressed against the surface of the living body, the contact portion is displaced, so that the gasket is pressed and moved by the pressing mechanism, and the drug solution is injected. A chemical injection device,
The pressing mechanism includes a presser that presses the gasket;
A driving force accumulating unit for accumulating a force for driving the pusher;
An operation unit operated when accumulating force in the driving force accumulation unit;
Driving force transmission means for transmitting the force generated by the operation at the operation unit to the driving force storage unit;
A displacement member that is displaced in the longitudinal direction of the pusher in accordance with the amount of accumulated force of the driving force accumulation unit;
In the state where the contact portion is displaced, the pusher and the displacement member are locked so that the pusher and the displacement member are integrally displaced, and in the state where the contact portion is not displaced, Locking means operable to release the lockA chemical injection device characterized by that.
[0009]
  (2) The driving force accumulating unit has an elastic member and deforms the elastic member to accumulate a force for driving the pusher.Above (1)The chemical injection device described in 1.
[0010]
  (3) The displacement member is displaced from the initial position by a distance corresponding to the operation amount at the operation unit.(1) or (2) aboveThe chemical injection device described in 1.
[0011]
  (4) The locking means can lock the pusher and the displacement member in an almost arbitrary positional relationship within a predetermined range.Any of (1) to (3) aboveThe chemical injection device described in 1.
[0012]
  (5) The chemical injection device maintains a state in which the driving force is accumulated in the driving force accumulation unit when the contact portion is not displaced, and the driving force accumulation unit in the state where the contact portion is displaced. A driving force accumulation state maintaining means for allowing the accumulated driving force to be released;
  When the operating unit is operated to accumulate the driving force in the driving force accumulating unit, the injection needle is punctured into the living body, and the contact portion is pressed against the living body surface, the pusher and the displacement member are locked. In addition, when the driving force of the driving force accumulating unit is released, the driving force accumulating unit drives the pusher via the displacement member, whereby the gasket is pressed and moved, and the chemical solution container It is configured to be injected with chemicals inside(1) to (4) aboveThe chemical injection device according to any one of the above.
[0013]
  (6) The driving force transmitting means includes a gear, and the driving force accumulation state maintaining means includes an engaging portion that is displaced to a position that engages with the teeth of the gear and a position that is retracted from the teeth.Above (5)The chemical injection device described in 1.
[0014]
  (7) An amount of chemical solution corresponding to the operation amount in the operation unit is injected.(1) to (6) aboveThe chemical injection device according to any one of the above.
[0015]
  (8) It has a misalignment prevention means for preventing the pusher from being displaced with respect to the apparatus main body after the chemical liquid injection operation and before the next chemical liquid injection operation.(1) to (7) aboveThe chemical injection device according to any one of the above.
[0016]
  (9) It has return means for returning the pusher to the initial position.(1) to (8) aboveThe chemical injection device according to any one of the above.
[0017]
  (10) The injection needle is mounted so as to protrude from a hole formed in the contact portion.(1) to (9) aboveThe chemical injection device according to any one of the above.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a chemical liquid injector according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
[0021]
1 is a perspective view showing an external appearance of an embodiment of the chemical liquid injector of the present invention, FIG. 2 is a perspective view showing an internal structure of the chemical liquid injector shown in FIG. 1, and FIG. 3 is a diagram showing a dial and driving force transmitting means. 4 and FIG. 5 are a plan view and a perspective view of the vicinity of the displacement member and the locking means, respectively, and FIGS. 6 and 7 are views as seen from the direction of the arrow X in FIG. 8 to 10 are partial cross-sectional plan views showing the internal structure and operating state of the chemical liquid injector shown in FIG. In the following, the left front side in FIG. 1, the left back side in FIG. 2 and the left side in FIGS. 8 to 10 are “tips”, the right back side in FIG. 1, the right front side in FIG. The right side in FIG. 10 is described as “base end”, the upper side in FIG. 1, FIG. 2 and FIG. 5 as “upper”, and the lower side as “lower”.
[0022]
The chemical injection device 1 shown in these drawings includes an apparatus main body 2 having a container loading portion 22 for loading the chemical liquid container 10 and a pressing mechanism for pressing and moving the gasket 102 of the chemical liquid container 10, and an end portion of the apparatus main body 2. And provided contact portion 31.
[0023]
The pressing mechanism is installed inside the housing 21 of the apparatus main body 2, and serves as a pusher 4 that pushes and moves the gasket 102 of the chemical solution container 10, and a driving force accumulation unit that accumulates a force that drives the pusher 4. A coil spring (elastic member) 11, a dial (operation unit) 12, a driving force transmission means 5 that transmits a force generated by an operation of the dial 12 to the coil spring 11, a displacement member 6, a pusher 4, and a displacement member 6 And locking means 7 capable of locking. Hereinafter, the configuration of each unit will be described.
[0024]
As shown in FIG. 1, the apparatus main body 2 includes a slightly elongated housing (housing) 21. As shown in FIG. 8, a container loading portion 22 in which the chemical liquid container 10 can be loaded (stored) is provided inside the housing 21. The chemical solution injector 1 is used in a state where the chemical solution container 10 is loaded in the container loading unit 22 and the injection needle 20 is mounted.
[0025]
Here, the chemical solution container 10 will be described. The chemical liquid container 10 includes a substantially cylindrical tubular body 101 made of a substantially transparent material, a gasket (plug body) 102 that slides liquid-tightly within the tubular body 101, and a tubular body 101. It has an elastic film 103 that seals the tip opening, and a chemical solution 90 is stored (filled) in a space surrounded by the cylindrical body 101 and the gasket 102.
[0026]
The medicinal solution 90 stored in the medicinal solution container 10 is appropriately selected according to the purpose of use. For example, insulin preparations, analgesics such as morphine (narcotic analgesics), antibiotics, anticancer agents, xylocaine, etc. And other narcotics.
[0027]
Although the capacity | capacitance of the chemical | medical solution container 10 is not specifically limited, For example, it can be set as about 1-3 mL (milliliter).
[0028]
An injection needle 20 is attached to the tip of the chemical solution container 10. The injection needle 20 is composed of a hollow double-ended needle in which sharp needle tips 201 and 202 are formed at both ends, respectively. A hub 30 is fixed to the injection needle 20 so as to cover the proximal end portion thereof. The hub 30 is attached to the tubular body 101 by screwing or fitting, and more preferably by screwing, with the distal end portion (reduced diameter portion) of the tubular body 101 inserted inside the hub 30 ( Fixed). In this fixed state, the needle tip 202 on the proximal end side of the injection needle 20 is pierced through the elastic film 103, and thus the lumen of the injection needle 20 communicates with the drug solution container 10. Note that, unlike the drawing, the mounting portion of the hub 30 (injection needle 20) may be provided in the apparatus main body 2.
[0029]
In the chemical solution injector 1, the outer diameter of the portion of the injection needle 20 that punctures the living body (the portion on the tip side from the hub 30) is preferably 0.25 mm or less, more preferably 0.15 to 0.25 mm. preferable.
[0030]
As shown in FIG. 1, finger pads 23, 23 to which a user applies a finger when gripping the apparatus main body 2 are provided on both ends so as to slightly protrude at the front end side of the side surface (side portion) of the housing 21. It has been.
[0031]
An elongated window portion 24 made of a transparent material is provided on the upper surface of the housing 21. The chemical solution container 10 loaded in the container loading unit 22 can be viewed from the outside through the window 24. Thereby, the residual amount of the chemical | medical solution 90 can be confirmed.
[0032]
A dial 12 that is operated when accumulating a driving force in the coil spring 11 is rotatably installed at a proximal end portion of the apparatus main body 2. The dial 12 has a ring shape, and a knurl 121 for preventing a finger from slipping is formed on the outer peripheral surface thereof. In addition, as shown in FIG. 2, teeth are formed on the inner peripheral surface of the dial 12 to constitute an internal gear 122. .
[0033]
As shown in FIG. 1, a disk-shaped dial pressing portion 25 is fixedly installed on the apparatus main body 2 so as to cover the upper side (upper surface) of the dial 12. At the center of the dial holding unit 25, a display unit 26 composed of, for example, a liquid crystal display element (LCD) is provided. The display unit 26 can display, for example, the injection setting amount of the chemical solution 90, the rotation amount of the dial 12, the previous injection amount, the previous injection time (time), and the like.
[0034]
The contact portion 31 is configured by a part of the trigger member 3. As shown in FIG. 2 and FIG. 8, the trigger member 3 includes an arm portion 32 extending along the longitudinal direction of the apparatus body 2, a contact portion 31 formed on the distal end side of the arm portion 32, and a base of the arm portion 32. It has a latch support portion 33 that is formed on the end side and supports a latch 81 described later. Most of the arm portion 32 and the latch support portion 33 are located in the apparatus main body 2, and the tip end portion of the arm portion 32 is exposed to the outside from the tip opening portion 211 of the housing 21 (see FIG. 1). .
[0035]
The contact part 31 is a part that is pressed against the surface of the living body during use. The contact portion 31 has a substantially plate shape and is positioned so as to cover the tip portion (tip surface) of the apparatus main body 2. A hole 311 is formed in the central portion of the contact portion 31, and a tip side portion of the injection needle 20 protrudes from the hole 311. That is, the needle tip 201 on the distal end side of the injection needle 20 protrudes (exposes) in the distal direction from the contact surface (tip surface) 312 of the contact portion 31. Thereby, the user can puncture the target site accurately and easily while visually recognizing the needle tip 201. In the illustrated configuration, the contact surface 312 is slightly curved in an arch shape.
[0036]
As shown in FIG. 8, such a trigger member 3 is fixed to a spring receiver 214 protruding from the inner wall of the housing 21 via a spring (coil spring) 13 and can be displaced in the longitudinal direction of the apparatus main body 2. ing. Accordingly, when the contact member 31 is pressed against the living body surface, the trigger member 3 is displaced (moved) in the proximal direction with respect to the apparatus main body 2 by the pressing force, and when the pressing force is released, the spring 13 is restored. Return to the original position by force (traction force). That is, when the contact portion 31 is pressed against the surface of the living body, the contact portion 31 is retracted toward the apparatus main body 2 (the state shown in FIG. 10), and when separated from the surface of the living body, it protrudes to the original position (the state shown in FIGS. Return.
[0037]
As shown in FIGS. 2 and 8, the pusher 4 includes a rod 41 that is a rod-shaped body having a rectangular cross-sectional shape, and a plate-shaped (disc-shaped) pressing portion 42 that is fixed to the tip of the rod 41. It is configured. The pusher 4 is positioned coaxially with the chemical solution container 10 loaded in the container loading unit 22 and is installed to be displaceable (movable) in the longitudinal direction. Further, the distal end surface of the pressing portion 42 is in contact with the proximal end surface of the gasket 102. On the upper surface of the rod 41, a large number of minute irregularities (projections or grooves) 411 extending in the direction orthogonal to the longitudinal direction are formed over the entire length. Such a pusher 4 is preferably made of a metal material.
[0038]
The coil spring 11 accumulates a driving force for driving the pusher 4 in the distal direction, and is installed in parallel with the pusher 4 and the chemical solution container 10. The base end of the coil spring 11 is in contact with a plate-like locking portion 212 that protrudes from the inner wall of the housing 21, and is a fixed end that is not displaced (moved) with respect to the apparatus main body 2. The distal end of the coil spring 11 moves in the proximal direction relative to the apparatus main body 2 and is deformed so that the entire length is compressed, thereby accumulating driving force. The driving force accumulating unit for accumulating the driving force for driving the pusher 4 is not limited to the compression coil spring such as the coil spring 11, and other forms of elasticity such as a tension coil spring, a gas spring (air spring), and a spring. It may be a member.
[0039]
The coil spring 11 is compressed when a force for rotating the dial 12 is transmitted by the driving force transmitting means 5. As shown in FIGS. 3 and 5, the driving force transmission means 5 mainly includes a small gear 51 that meshes with the internal gear 122 of the dial 12, a screw gear 52 that is installed coaxially with the small gear 51, and a screw gear 52. A screw gear 53 meshed with the rotation axis orthogonal to the screw gear 54, a screw gear 54 provided coaxially with the screw gear 53, a screw gear 55 meshed with the rotation axis orthogonal to the screw gear 54, and a screw gear 55 , A belt 57 wound around the drum 56, a linear body 58 connected to the front end of the belt 57 via a displacement member 6 described later, and a front end of the linear body 58 It is comprised with the substantially cylindrical latching member 59 fixed to. In each figure, the internal gear 122, the small gear 51, and the screw gears 52, 53, 54, and 55 are illustrated with simplified shapes.
[0040]
As shown in FIG. 2, the linear body 58 is inserted through the inside of the coil spring 11, and the base end surface of the locking member 59 is in contact with the tip of the coil spring 11.
[0041]
When the dial 12 is rotated in a predetermined direction (clockwise in FIGS. 2 and 8), the rotational force is transmitted by the small gear 51 and the screw gears 52, 53, 54, and 55, and the drum 56 is transferred to FIGS. The belt 57 is wound up by rotating clockwise. When the belt 57 is wound around the drum 56, the locking member 59 moves in the proximal direction due to the tension of the belt 57 and the linear body 58, and compresses the coil spring 11 with the locking portion 212 (see FIG. 9). ). Thereby, driving force (energy) is accumulated in the coil spring 11.
[0042]
As shown in FIGS. 5 and 8, the distal end portion of the belt 57 and the proximal end portion of the linear body 58 are fixed to the displacement member 6. In the illustrated configuration, the displacement member 6 is bent in a crank shape. When the belt 12 is wound around the drum 56 by rotating the dial 12 in a predetermined direction, the displacement member 6 is displaced in the proximal direction (see FIG. 9). That is, the displacement member 6 is displaced in the longitudinal direction (proximal direction) of the pusher 4 in conjunction with (according to) the coil spring 11 being compressed and deformed. At this time, the displacement member 6 is displaced from the initial position (position shown in FIG. 8) by a distance proportional to the operation amount (rotation amount) of the dial 12. In other words, the displacement member 6 is displaced according to the amount of accumulated force of the coil spring 11.
[0043]
When the driving force is accumulated in the coil spring 11 and the displacement member 6 is displaced in the proximal direction (the state shown in FIG. 9), when the contact portion 31 is pressed against the surface of the living body, the displacement member 6 is locked by the locking means 7 described later. While being locked with the pusher 4, the driving force accumulated in the coil spring 11 is released, whereby the displacement member 6 and the pusher 4 are moved together in the distal direction, and the displacement member 6 is moved to the initial position. Return (see FIG. 10).
[0044]
As shown in FIG. 5, the displacement member 6 is formed with a lock member mounting portion 61, and a lock member 71 is mounted on the lock member mounting portion 61.
[0045]
The lock means 7 includes a lock member 71, a switching member 72, and a spring (coil spring) 73.
[0046]
The lock member 71 has a substantially “U” shape and is preferably made of a metal material. As shown in FIG. 2, the rod 41 of the pusher 4 is inserted into a rectangular hole formed by being surrounded by the lock member 71 and the lock member mounting portion 61. A large number of minute irregularities (projections or grooves) 711 corresponding to the irregularities 411 are formed in a portion of the lock member 71 facing the upper surface of the rod 41. Further, the lock member 71 is formed with an inclined tapered surface 712.
[0047]
As shown in FIG. 7, in a state where the lock member 71 is pressed downward, the presser 4 and the displacement member 6 are locked (fixed) via the lock member 71 by engaging the recesses 411 and 711 with each other. The At this time, since the unevenness 411 and the unevenness 711 are formed with a minute size (interval), the pusher 4 and the displacement member 6 can be locked in an almost arbitrary positional relationship. In this locked state, the pusher 4 and the displacement member 6 are displaced together.
[0048]
On the other hand, as shown in FIG. 6, the unevenness 411 and the unevenness 711 are not engaged with each other when the lock member 71 is not pressed downward. In this unlocked state, the pusher 4 and the displacement member 6 can be relatively displaced.
[0049]
As shown in FIGS. 4 and 5, a switching member 72 that switches the lock state of the lock member 71 is provided on the side of the lock member 71. The switching member 72 is fixed to the spring receiver 213 protruding from the inner wall of the housing 21 via two springs 73, 73. When the spring 73 expands and contracts, the longitudinal direction of the pusher 4 is changed. It can be displaced in the orthogonal direction. Further, the switching member 72 is formed with a tapered surface 721 that contacts the tapered surface 712. The tapered surface 721 is formed to extend along the longitudinal direction of the pusher 4 so as to be able to come into contact with the tapered surface 712 regardless of the position of the lock member 71 that is displaced together with the displacement member 6.
[0050]
As shown in FIG. 6, the switching member 72 is positioned on the right side in the figure by the restoring force (pressing force) of the spring 73 in a normal state. In this state, as described above, the pusher 4 and the displacement member 6 are not locked. As shown in FIG. 7, when the switching member 72 is displaced to the left in FIG. 7, the taper surface 721 slides on the taper surface 712 and presses the taper surface 712, whereby the lock member 71 is pressed downward. The pusher 4 and the displacement member 6 are locked via the lock member 71.
[0051]
As shown in FIG. 8, the arm portion 32 of the trigger member 3 is located on the side of the switching member 72. A cam crest 722 having a tapered surface is formed on the side surface of the switching member 72 so as to protrude toward the arm portion 32 side. Further, a cam mountain 321 having a tapered surface is formed on the side surface of the arm portion 32 so as to be positioned in the vicinity of the cam mountain 722.
[0052]
In a state where the contact portion 31 is not pressed against the surface of the living body and the trigger member 3 is not displaced in the proximal direction (the state shown in FIGS. 8 and 9), the cam peak 321 is located on the distal side from the cam peak 722. Thereby, the switching member 72 is in the position shown in FIG. On the other hand, in a state where the contact portion 31 is pressed against the surface of the living body and the trigger member 3 is displaced in the proximal direction (the state shown in FIG. 10), the cam mountain 321 is displaced in the proximal direction and the cam mountain 722 is displaced. And the cam crest 722 is pressed upward in FIG. As a result, the switching member 72 is displaced against the pressing force of the spring 73 and enters the state shown in FIG. This operation is performed smoothly and reliably by the fact that the tapered surfaces of the cam crest 321 and the cam crest 722 are generated while sliding.
[0053]
When the pressing force against the contact portion 31 is released from the state shown in FIG. 10 (when the contact portion 31 is separated from the living body surface), the trigger member 3 returns to the original position by the restoring force of the spring 13, and the switching member 72 moves to the spring 73. By returning to the original position by the restoring force, the state shown in FIG. 6 is restored.
[0054]
With such a configuration, when the contact portion 31 is displaced in the proximal direction (retracted state), the pusher 4 and the displacement member so that the pusher 4 and the displacement member 6 are displaced (moved) together. 6 is locked, and the lock is released in a state where the contact portion 31 is not displaced in the proximal direction (projecting state).
[0055]
In the present embodiment, the locking means 7 is switched between the locked state and the unlocked state when the displacement of the contact portion 31 is transmitted by the cam mechanism having the cam peaks 321 and 722. As a result, the structure can be reduced in size and simplified, and more reliable operation can be obtained.
[0056]
As shown in FIGS. 2 and 8, the driving force accumulation state maintaining means 8 is installed in the latch support portion 33 and is located inside the dial 12. This driving force accumulation state maintaining means 8 mainly includes a latch 81 having an engaging portion that can be engaged with the internal gear 122 at the tip, a pin 82 that rotatably supports the latch 81, and the latch 81. 8 and a spring 83 urging counterclockwise. The latch 81 can be rotated clockwise around the pin 82 from the state shown in FIG. 8, but cannot be rotated counterclockwise from the state shown in FIG. When the latch 81 rotates clockwise, the latch 81 returns to the state shown in FIG. 8 due to the restoring force (traction force) of the spring 83.
[0057]
In the state shown in FIG. 8, the tip of the latch 81 is inserted into the tooth groove of the internal gear 122 of the dial 12. In this state, when the dial 12 is rotated clockwise in the figure, the latch 81 rotates clockwise in the figure and gets over the teeth of the internal gear 122 one by one. On the other hand, the dial 12 cannot rotate counterclockwise in the figure due to the engagement between the internal gear 122 and the latch 81. By operating the driving force accumulation state maintaining means 8 as described above, even if the dial 12 is rotated clockwise in FIG. Therefore, the reverse rotation of the drum 56 interlocked with the dial 12 is also prevented, and the state where the driving force is accumulated in the coil spring 11 (the state where the coil spring 11 is compressed) is maintained (see FIG. 9). As described above, the driving force accumulation state maintaining unit 8 maintains the state in which the driving force is accumulated in the coil spring 11 when the contact portion 31 (the trigger member 3) is not displaced in the proximal direction.
[0058]
On the other hand, the driving force accumulation state maintaining means 8 releases the driving force accumulated in the coil spring 11 when the contact portion 31 (trigger member 3) is displaced in the proximal direction as described below. Is acceptable. As shown in FIG. 10, when the contact portion 31 (trigger member 3) is displaced in the proximal direction, the latch 81 is retracted from the internal gear 122, and the engagement between the latch 81 and the internal gear 122 is released. Can rotate in the reverse direction (counterclockwise in FIG. 10). As a result, the restoring force of the coil spring 11 is transmitted to the driving force transmission means 5 through the reverse path, and the dial 12 rotates in the reverse direction. At the same time, the pusher 4 and the displacement member 6 are locked by the locking means 7, and the pusher 4 moves together with the displacement member 6 in the distal direction by the restoring force of the coil spring 11. When the pusher 4 moves in the distal end direction, the pusher 4 is pressed, the gasket 102 slides in the cylindrical body 101 in the distal end direction, the drug solution 90 is discharged from the injection needle 20, and is injected into the living body.
[0059]
As described above, the moving distance of the displacement member 6 from the initial position (position shown in FIG. 8) is proportional to the operation amount (rotation amount) of the dial 12. When the driving force accumulated in the coil spring 11 is released, the displacement member 6 moves integrally with the pusher 4 in the distal direction and returns to the initial position. Therefore, the moving distance of the pusher 4 in the distal direction is also proportional to the operation amount (rotation amount) of the dial 12. Therefore, in the chemical solution injection operation of the chemical solution injection device 1, an amount of the chemical solution 90 proportional to (in response to) the operation amount (rotation amount) of the dial 12 is injected. In other words, the injection amount of the chemical solution 90 can be set to a desired amount by adjusting the operation amount (rotation amount) of the dial 12.
[0060]
Further, when the dial 12 is rotated, the latch 81 gets over the teeth of the internal gear 122 one by one, and a click feeling is obtained. In the chemical solution injector 1, the minimum set value of the amount of the chemical solution 90 to be injected corresponds to the rotation amount of the dial 12 such that the latch 81 gets over one tooth of the internal gear 122. The injection setting amount of the chemical solution 90 corresponding to the rotation amount (1 notch) of the dial 12 so that the latch 81 gets over one tooth of the internal gear 122 is not particularly limited, but is about 5 to 20 μL (microliter), for example. can do. For example, when one notch corresponds to an injection setting amount of 10 μL, the amount of the drug solution 90 to be injected is set to a desired amount in steps of 10 μL from a minimum of 10 μL to a maximum amount (for example, about 600 μL) depending on the number of notches rotating the dial 12. Can be set to
[0061]
The rotation amount of the dial 12 is detected by a rotation amount detection mechanism (not shown). The detection signal is converted into an injection set amount by a calculation means (not shown), and the obtained injection set amount is displayed on the display unit 26. It has become so.
[0062]
The moving distance from the initial position of the displacement member 6 when the dial 12 is rotated is T, the injection amount of the chemical solution 90 is V, and the chemical solution storage space in the barrel of the cylindrical body 101 of the chemical solution container 10 is crossed. When the area is S, there is a relationship of the following formula (I) between them.
[0063]
T = V / S (I)
From the formula (I), the amount of chemical injection corresponding to the rotation amount of 1 notch of the dial 12 is V₀Then, the movement amount of the displacement member 6 when the dial 12 is rotated by one notch is V₀The reduction ratio (the number of teeth of each gear and the diameter of the drum 56) of the driving force transmission means 5 is determined so as to be / S.
[0064]
In the chemical injection device 1 according to the present embodiment, a positional deviation prevention means 9 for preventing the pusher 4 from being displaced with respect to the apparatus main body 2 between the chemical injection operation and the next chemical injection operation is provided. . As shown in FIGS. 2 and 8, the misalignment prevention means 9 mainly includes a rod 91, a lock member 92, a lock member mounting portion 93 to which the lock member 92 is mounted, the rod 91 and the pusher 4. And a connecting member 94 for connecting the two.
[0065]
The rod 91 is substantially the same member as the rod 41 of the pusher 4, and a large number of minute irregularities 911 are formed over the entire length on the upper surface thereof.
[0066]
The lock member 92 is substantially the same member as the lock member 71, and is installed on the side of the switching member 72 (on the side opposite to the lock member 71). The lock member mounting portion 93 is fixedly provided with respect to the inner wall of the housing 21. Therefore, the lock member 92 can be displaced only in the vertical direction.
[0067]
A rod 91 is inserted through a rectangular hole formed by being surrounded by the lock member 92 and the lock member mounting portion 93. A large number of minute irregularities 921 corresponding to the irregularities 911 are formed in a portion of the lock member 92 facing the upper surface of the rod 91.
[0068]
The lock member 92 is formed with an inclined tapered surface 922. In addition, the switching member 72 is formed with a tapered surface 723 that contacts the tapered surface 922.
[0069]
In the present embodiment, the switching member 72 also has a function of switching the lock state of the lock member 92. That is, in the state shown in FIG. 6, the force by which the spring 15 biases the switching member 72 to the right side in the drawing presses the lock member 92 downward by the contact (pressure contact) between the tapered surface 723 and the tapered surface 922. As a result, the unevenness 911 and the unevenness 921 are engaged with each other, and the rod 91 is locked (fixed) to the apparatus main body 2 (housing 21). On the other hand, in the state shown in FIG. 7, the switching member 72 is displaced to the left side in the drawing, so that the force pressing the lock member 92 downward is released, and the engagement between the unevenness 911 and the unevenness 921 is released. 91 is movable in the longitudinal direction with respect to the apparatus main body 2 (housing 21).
[0070]
As shown in FIG. 8, the connecting member 94 is an elongated member, is disposed so as to extend from the proximal end of the rod 91 in the proximal direction, is bent so as to draw an arc, is folded back in the distal direction, and the pusher 4 It is fixed (connected) to the proximal end of (rod 41). The connecting member 94 is flexible and substantially does not expand and contract in the longitudinal direction (axial direction), and can transmit a pressing force and a traction force in the longitudinal direction (axial direction). It is composed of a wire or a closely coiled member. The curved portion of the connecting member 94 is inserted into a groove (not shown) so that no slack is generated.
[0071]
When the pusher 4 and the rod 91 are interlocked with each other through such a connecting member 94, the pusher 4 and the rod 91 are displaced (moved) in directions opposite to each other, and their movement amounts are equal (FIG. 9 and FIG. 9). (See FIG. 10). Further, when the rod 91 is fixed to the apparatus main body 2, the pusher 4 is not displaced (moved) with respect to the apparatus main body 2.
[0072]
In the chemical solution injector 1 of the present embodiment, the coil spring 15 is provided as a return means for returning the pusher 4 to the initial position after the pusher 4 is moved in the distal direction by performing the injection operation of the chemical solution 90. The proximal end portion of the coil spring 15 is connected to the distal end of the rod 91, and the distal end portion of the coil spring 15 is fixed to a protrusion 215 that protrudes from the inner wall of the housing 21. Further, the liquid injector 1 is provided with a lock release mechanism (not shown) that simultaneously releases the lock state of the lock member 71 and the lock member 92. When the chemical solution container 10 is replaced by using up the chemical solution 90, when the lock release mechanism is operated, both the pusher 4 and the rod 91 are unlocked, and the pusher 4 and the rod 91 are free from the apparatus main body 2. It becomes the state of. Then, the restoring force (traction force) of the coil spring 15 moves the rod 91 in the distal direction, and the pusher 4 is pulled by the connection member 94 and moves in the proximal direction. Thereby, the pusher 4 inserted in the cylindrical body 101 returns to the initial position shown in FIG. 8, and the chemical | medical solution container 10 can be replaced | exchanged easily.
[0073]
Next, the usage method and operation | movement of each part at the time of inject | pouring the chemical | medical solution Q to the abdomen using the chemical | medical solution injection apparatus 1 are demonstrated.
[0074]
[1] From the initial state shown in FIG. 8, the dial 12 is rotated in the clockwise direction in FIG. 8 until the injection set amount displayed on the display unit 26 reaches a desired value. In the state shown in FIG. 8, since the rod 91 is locked to the apparatus main body 2 by the lock member 92, the pusher 4 cannot move relative to the apparatus main body 2, and the pusher 4 and the displacement member 6 are locked. It has not been. Therefore, when the dial 12 is rotated, the displacement member 6 moves in the proximal direction while the pusher 4 is stopped, and the coil spring 11 is compressed (see FIG. 9).
[0075]
[2] Pick up the skin near the puncture site in the abdomen with the left hand (non-dominant hand) to form a subcutaneous pocket.
[0076]
[3] With the right hand (handed hand), place the finger against the finger pads 23 and 23 to hold the apparatus main body 2 and puncture the needle tip 201 of the injection needle 20 into the subcutaneous pocket forming part.
[0077]
[4] With the injection needle 20 punctured, the contact portion 31 is pressed against the living body surface (skin near the puncture site) so that the apparatus main body 2 is further pulled toward the abdomen. Thereby, as shown in FIG. 10, the trigger member 3 moves in the proximal direction. The movement of the trigger member 3 triggers the following three operations. (1) The displacement member 6 and the pusher 4 are locked via the lock member 71. (2) The locked state of the rod 91 by the lock member 92 is released. (3) The driving force accumulation state of the coil spring 11 is released. When these three operations occur, the extending coil spring 11 drives the pusher 4 in the distal direction via the displacement member 6. Thereby, the gasket 102 slides in the cylindrical body 101 in the distal direction, and the set amount of the chemical solution 90 is discharged from the injection needle 20 and injected into the living body. At this time, the rod 91 moves in the proximal direction as the pusher 4 moves in the distal direction.
[0078]
[5] The injection needle 20 is removed from the puncture site, and the drug solution injection operation is completed. Thus, in the liquid injector 1 of the present invention, it is not necessary to change the position after pressing the injection needle 20 to push the injection button, the operation is simple, the punctured injection needle 20 can be removed, or the liquid injector 1 There is no risk of accidental dropping. In addition, the fear of the user is reduced. In addition, since the drug solution 90 is automatically discharged by the driving force accumulated in the coil spring 11, no force is required for the injection operation of the drug solution 90. Therefore, the operation is easy even when a patient with weak grip strength is used. can do.
[0079]
When the injection needle 20 is removed from the puncture site and the pressing force from the surface of the living body against the contact portion 31 is released, the trigger member 3 moves in the distal direction from the state shown in FIG. 10 and returns to the original position. As a result, the locked state of the displacement member 6 and the pusher 4 is released, and the rod 91 returns to the state of being locked to the apparatus main body 2 by the lock member 92. In a state where the rod 91 is fixed to the apparatus main body 2, the pusher 4 is also fixed to the apparatus main body 2 through the connection member 94.
[0080]
[6] When the liquid injection operation is completed, a cap (not shown) is put on the needle tip 201 of the injection needle 20, the hub 30 is rotated in a predetermined direction, and the screwing with respect to the distal end portion of the cylindrical body 101 is released. The injection needle 20 is removed together with the hub 30. The hole from which the injection needle 20 of the elastic film 103 is removed is automatically closed by its elasticity, and the chemical solution 90 does not leak out. The removed injection needle 20 and hub 30 are subjected to disposal. In the next chemical liquid injection operation, the new injection needle 20 and the hub 30 are attached to the tip of the cylindrical body 101.
[0081]
[7] The next chemical liquid injection operation is performed in the same manner as described above except that the pusher 4 and the rod 91 are started from the state shown in FIG. By the time until the next chemical liquid injection operation, the pusher 4 is fixed to the apparatus main body 2 by the misalignment prevention means 9, so that the position of the pusher 4 at the end of the previous chemical liquid injection operation can be ensured. Can be held. Therefore, an accurate amount of the chemical liquid 90 can be injected more reliably in the next chemical liquid injection operation.
[0082]
As mentioned above, although the chemical | medical solution injection device of this invention was demonstrated about embodiment of illustration, this invention is not limited to this, Each part which comprises a chemical | medical solution injection device is arbitrary structures which can exhibit the same function. Can be substituted. Moreover, arbitrary components may be added.
[0083]
【The invention's effect】
As described above, according to the present invention, it is not necessary to change the drug solution injector after the injection needle is punctured into the target site. Therefore, the operation is simple, and there is no possibility that the once-punctured injection needle is removed or the chemical solution injection device is accidentally dropped, and the safety is high. In addition, the fear of the user is reduced.
[0084]
In addition, since the chemical solution is automatically discharged and injected, no force is required for the injection operation. Therefore, it can be easily operated even when a patient with weak grip is used.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of an embodiment of a chemical liquid injector of the present invention.
2 is a perspective view showing an internal structure of the chemical liquid injector shown in FIG. 1. FIG.
FIG. 3 is a perspective view showing a part of a dial and driving force transmission means.
FIG. 4 is a plan view of the vicinity of a displacement member and locking means.
FIG. 5 is a perspective view of the vicinity of a displacement member and locking means.
6 is a view as seen from the direction of arrow X in FIG. 5. FIG.
7 is a view as seen from the direction of arrow X in FIG. 5. FIG.
8 is a partial cross-sectional plan view showing an internal structure and an operating state of the chemical liquid injector shown in FIG. 1. FIG.
9 is a partial cross-sectional plan view showing the internal structure and operating state of the chemical liquid injector shown in FIG. 1. FIG.
10 is a partial cross-sectional plan view showing the internal structure and operating state of the chemical liquid injector shown in FIG. 1. FIG.
[Explanation of symbols]
1 Chemical injection device
11 Coil spring
12 dial
121 knurled
122 Internal gear
13 Spring
15 Coil spring
2 Main unit
21 Housing
211 Tip opening
212 Locking part
213, 214 Spring receiver
215 protrusion
22 Container loading section
23 Finger rest
24 windows
25 Dial holding part
26 Display section
3 Trigger members
31 Contact area
311 hole
312
32 arms
321 Mount Cam
33 Latch support
4 Pusher
41 Rod
411 irregularities
42 Pressing part
5 Driving force transmission means
51 small gear
52, 53, 54, 55 Screw gear
56 drums
57 belt
58 Linear
59 Locking member
6 Displacement member
61 Locking member mounting part
7 Locking means
71 Locking member
711 irregularities
712 Tapered surface
72 Switching member
721 Tapered surface
722 Mount Cam
723 Tapered surface
73 Spring
8 Driving force accumulation state maintenance means
81 latch
82 pins
83 Spring
9 Misalignment prevention means
91 Rod
911 irregularities
92 Locking member
921 Concavity and convexity
922 taper surface
93 Locking member mounting part
94 Connection member
10 Chemical container
101 Tubular body
102 Gasket
103 Elastic membrane
20 Injection needle
201, 202 Needle point
30 hub
90 chemicals

Claims (10)

A chemical container having a cylindrical body filled with a chemical liquid and a gasket that slides liquid-tightly in the cylindrical body is loaded, and a needle tip that penetrates the chemical liquid container is inserted into one end and the living body is inserted into the other end. an injection needle having a needle tip which is mounted in use,
An apparatus body having a container loading section for loading the chemical liquid container, and a pressing mechanism for pressing and moving the gasket;
Provided at the end of the device body, provided with a contact portion that is displaced by the pressing force when pressed against the surface of the living body and can return to the original position when the pressing force is released,
When the injection needle is punctured into the living body and the contact portion is pressed against the surface of the living body, the contact portion is displaced, whereby the gasket is pressed and moved by the pressing mechanism, and the drug solution is injected. A chemical injection device,
The pressing mechanism includes a presser that presses the gasket;
A driving force accumulating unit for accumulating a force for driving the pusher;
An operation unit operated when accumulating force in the driving force accumulation unit;
Driving force transmission means for transmitting the force generated by the operation at the operation unit to the driving force storage unit;
A displacement member that is displaced in the longitudinal direction of the pusher in accordance with the amount of accumulated force of the driving force accumulation unit;
In the state where the contact portion is displaced, the pusher and the displacement member are locked so that the pusher and the displacement member are integrally displaced, and in the state where the contact portion is not displaced, And a locking means that operates to release the lock . The drug solution injector according to claim 1 , wherein the driving force accumulation unit includes an elastic member, and deforms the elastic member to accumulate a force for driving the pusher. The chemical solution injection device according to claim 1 , wherein the displacement member is displaced by a distance corresponding to an operation amount at the operation unit from an initial position. The drug solution injection device according to any one of claims 1 to 3, wherein the locking means is capable of locking the pusher and the displacement member with an almost arbitrary positional relationship within a predetermined range. In the state where the contact portion is not displaced, the chemical injection device maintains the state where the driving force is accumulated in the driving force accumulation portion, and is accumulated in the driving force accumulation portion when the contact portion is displaced. A driving force accumulation state maintaining means for allowing the driving force to be released;
When the operating unit is operated to accumulate the driving force in the driving force accumulating unit, the injection needle is punctured into the living body, and the contact portion is pressed against the living body surface, the pusher and the displacement member are locked. In addition, when the driving force of the driving force accumulating unit is released, the driving force accumulating unit drives the pusher via the displacement member, whereby the gasket is pressed and moved, and the chemical solution container The chemical solution injection device according to any one of claims 1 to 4 , wherein the chemical solution is configured to be injected. It said driving force transmitting means has a gear, the driving force accumulation state maintaining means, according to claim 5 having an engaging portion which is displaced to a position away from the position and teeth that engage the teeth of the gear Chemical injection device. The chemical | medical solution injection | pouring apparatus in any one of Claim 1 thru | or 6 with which the quantity of the chemical | medical solution according to the operation amount in the said operation part is inject | poured. The chemical solution injection device according to any one of claims 1 to 7 , further comprising a displacement prevention unit that prevents the pusher from being displaced with respect to the device main body between a chemical solution injection operation and a next chemical solution injection operation. . The chemical solution injection device according to any one of claims 1 to 8 , further comprising return means for returning the pusher to an initial position. The chemical injection device according to any one of claims 1 to 9 , wherein the injection needle is mounted so as to protrude from a hole formed in the contact portion.

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