JP2005270579A - Medical fluid syringe, extension tube, and medical fluid injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical fluid syringe of which the pressure of a medical fluid injected to a subject can easily be checked. <P>SOLUTION: A piston member 220 to a tip of which a piston head 222 is attached is inserted slidably in a transparent cylinder member 210 inside of which is hollow, The piston head 222 is formed of a pressure sensitive elastic body which color changes with pressure. When the piston member 220 is press-fit to the cylinder member 210 when the medical fluid is injected to the subject, the color of the piston head 222 changes in response to pressure of the medical fluid. The pressure of the medical fluid injected to the subject can be visibly confirmed by this simple structure, without the need of a pressure sensor or complicated works. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drug solution syringe, an extension tube, and a drug solution injection device, and more particularly, to a drug solution syringe, an extension tube, and a drug solution injection device that are used to inject a drug solution into a subject.

  Currently, a drug syringe is used to inject a drug solution into a blood vessel of a subject, and such a drug solution syringe and a blood vessel may be connected by an extension tube. A general chemical syringe includes a cylinder member and a piston member, and the cylinder member is formed in a hollow cylindrical shape.

  More specifically, the cylinder member is formed with a conduit portion at the tip and is open at the end. The cylinder member is provided with a piston head that seals the inner surface of the cylinder member at the tip, and is slidably inserted into the inside from the opening at the end of the cylinder member. The cylinder member is filled with a chemical solution, and the conduit portion is connected to the blood vessel of the subject by an injection needle or an extension tube. Therefore, when the piston member is pressed into the cylinder member in such a state, the chemical solution is pressed into the blood vessel of the subject.

  The extension tube as described above includes a syringe connector, an injection needle, and a tube main body, and the syringe connector and the injection needle are connected by a tube main body formed of a flexible elastic body. The syringe connector is detachably connected to the chemical syringe, and the injection needle is connected to the blood vessel of the subject.

  Further, a fluoroscopic image from a subject is obtained by a fluoroscopic imaging apparatus such as a CT (Computed Tomography) scanner, an MRI (Magnetic Resonance Imaging) apparatus, a PET (Positron Emission Tomography) apparatus, an ultrasonic diagnostic apparatus, an angio apparatus, and an MRA (MR Angio) apparatus. When imaging a subject, a chemical solution such as a contrast medium or physiological saline may be injected into the subject using a chemical solution injection device.

  Such a chemical liquid injector has a cylinder holding mechanism and a piston drive mechanism, and detachably holds the cylinder member of the chemical liquid syringe by the cylinder holding mechanism. The piston drive mechanism slidably supports the piston pressing member, and presses the piston member against the held cylinder member with the piston pressing member.

In addition, the above-mentioned chemical | medical solution syringe and chemical | medical solution injection | pouring apparatus as mentioned above were invented and applied in the past by this applicant etc. (for example, refer patent documents 1-3).
JP 2003-235974 A JP 2002-11096 A JP 2002-102343 A

  As described above, when the drug solution is injected into the blood vessel of the subject, it is naturally required that the pressure is appropriate. However, since the chemical syringe and the extension tube are disposable from the viewpoint of hygiene, it is practically difficult to mount a pressure sensor, a display, and the like on the chemical syringe and the extension tube. For example, it can be assumed that a dedicated device including a pressure sensor, a display, and a power supply device is formed, and the device is connected to an extension tube or the like, but this is troublesome.

  Moreover, in a chemical injection device, a pressure sensor is generally mounted on a piston drive mechanism, and the detection result is displayed and output on a display. For example, such a display is arranged at a position away from an injection head to which a chemical syringe is attached, but an operator is often located near a subject when performing an injection operation. In such a case, since the operator is not always gazing at the display, even if the pressure of the chemical liquid injected into the subject deviates from the appropriate range, it may be delayed to notice it.

  Furthermore, as described above, when a drug solution is injected into a blood vessel of a subject, the temperature is also required to be appropriate. For this reason, the chemical solution is heated together with the chemical syringe.For example, the temperature of the chemical solution may be reduced at the time of injection due to work delay or the like. If it is heated too much, the chemical solution at the time of injection will be too hot.

  However, it is actually difficult to mount a temperature sensor, thermometer, etc. on the chemical syringe or extension tube, and it is also work to connect a dedicated device equipped with a temperature sensor, thermometer, etc. to the extension tube, etc. Is complicated.

  The present invention has been made in view of the above-described problems, and a chemical syringe and extension tube that can easily confirm the pressure of a chemical injected into the subject, and the subject even if the operator is not gazing at the display An object of the present invention is to provide a chemical liquid injection device that can easily check the pressure of a chemical liquid injected into the liquid.

  The 1st chemical | medical solution syringe of this invention has a cylinder member and a piston member, and the cylinder member is formed in the hollow transparent cylindrical shape. Further, the cylinder member is formed with a conduit portion at the tip and has an open end, and is filled with a chemical solution. The piston member is provided with a piston head that seals the inner surface of the cylinder member at the tip, and is slidably inserted into the inside from the opening at the end of the cylinder member. However, since at least a part of the piston head is formed of a pressure-sensitive elastic body that changes color due to pressure, when the piston member is press-fitted into the cylinder member in order to inject the chemical into the subject, the pressure corresponding to the pressure of the chemical The piston head changes color.

  In the second drug solution syringe of the present invention, since at least a part of the piston head is formed of a temperature-sensitive elastic body that changes color according to temperature, the piston member is press-fitted into the cylinder member in order to inject the drug solution into the subject. When the temperature of the chemical solution changes, the piston head changes color.

  Furthermore, in the third liquid syringe of the present invention, a part of the piston head is formed of a pressure-sensitive elastic body that changes color with pressure and a part of the piston head is formed of a temperature-sensitive elastic body that changes color with temperature. When the piston member is press-fitted into the cylinder member in order to inject the chemical solution into the subject, the piston head changes color according to the pressure and temperature of the chemical solution.

  In the fourth chemical syringe of the present invention, since at least a part of the inner surface of the cylinder member is formed of a pressure-sensitive elastic body that changes color due to pressure, a piston member is attached to the cylinder member in order to inject the chemical into the subject. When press-fitting, the cylinder member changes color corresponding to the pressure of the chemical solution.

  Furthermore, in the fifth chemical liquid syringe of the present invention, since at least a part of the inner surface of the cylinder member is formed of a temperature-sensitive elastic body that changes color depending on the temperature, a piston member is attached to the cylinder member in order to inject the chemical liquid into the subject. When press-fitting, the cylinder member changes color corresponding to the temperature of the chemical solution.

  In the sixth chemical syringe of the present invention, a part of the inner surface of the cylinder member is formed of a pressure-sensitive elastic body that changes color with pressure, and a part thereof is formed of a temperature-sensitive elastic body that changes color with temperature. Therefore, when the piston member is press-fitted into the cylinder member in order to inject the chemical solution into the subject, the cylinder member changes color according to the pressure and temperature of the chemical solution.

  The first extension tube of the present invention has a syringe connector, an injection needle, and a tube main body, and this tube main body connects the syringe connector and the injection needle to flow the chemical solution. The syringe connector is detachably connected to the chemical syringe, and the injection needle is connected to the blood vessel of the subject. However, since at least a part of the tube body is formed of a pressure-sensitive elastic body that changes color due to pressure, when the drug solution is injected from the drug solution syringe to the subject through the extension tube, the tube body corresponds to the pressure of the drug solution. Discolor.

  Further, in the second extension tube of the present invention, since at least a part of the tube body is formed of a temperature-sensitive elastic body that changes color depending on the temperature, when the drug solution is injected from the drug syringe to the subject through the extension tube, The tube body changes color according to the temperature of the chemical.

  Furthermore, in the third extension tube of the present invention, a part of the tube body is formed of a pressure-sensitive elastic body that changes color due to pressure, and a part thereof is formed of a temperature-sensitive elastic body that changes color depending on temperature. When a drug solution is injected from the drug solution syringe into the subject through the extension tube, the tube body changes color according to the pressure and temperature of the drug solution.

  The chemical injection device of the present invention has a cylinder holding mechanism and a piston drive mechanism, and the cylinder holding mechanism holds the cylinder member of the chemical syringe in a detachable manner. The piston drive mechanism slidably supports the piston pressing member, and presses the piston member against the held cylinder member with the piston pressing member. However, since at least a part of the piston pressing member is formed of a pressure-sensitive elastic body that discolors due to pressure, when the drug solution is injected into the subject by press-fitting the piston member into the cylinder member with the piston pressing member, The piston pressing member changes color corresponding to the pressure.

  In the first chemical syringe of the present invention, when at least a part of the piston head is formed of a pressure-sensitive elastic body that changes color due to pressure, the piston member is pressed into the cylinder member in order to inject the chemical into the subject. Since the piston head changes color in response to the pressure of the chemical solution, the pressure of the chemical solution injected into the subject is intuitively confirmed by a simple structure without requiring a pressure sensor or complicated work. be able to.

  In the second chemical liquid syringe of the present invention, when the piston member is press-fitted into the cylinder member in order to inject the chemical liquid into the subject, since at least a part of the piston head is formed of a temperature-sensitive elastic body that changes color with temperature. Since the piston head changes color in response to the temperature of the chemical solution, the temperature of the chemical solution injected into the subject is intuitively confirmed by a simple structure without requiring a temperature sensor or complicated work. be able to.

  In the third drug solution syringe of the present invention, a part of the piston head is formed of a pressure-sensitive elastic body that changes color with pressure, and a part of the piston head is formed of a temperature-sensitive elastic body that changes color with temperature. When the piston member is pressed into the cylinder member to inject the subject into the subject, the piston head changes color in response to the pressure and temperature of the chemical solution. An operator can intuitively check with a simple structure without requiring a temperature sensor or complicated work.

  In the fourth drug solution syringe of the present invention, at least a part of the inner surface of the cylinder member is formed of a pressure-sensitive elastic body that discolors due to pressure, so that the piston member is press-fitted into the cylinder member to inject the drug solution into the subject. Since the cylinder member changes color in response to the pressure of the chemical solution, the pressure of the chemical solution injected into the subject can be intuitively configured with a simple structure without requiring a pressure sensor or complicated work. It can be confirmed.

  In the fifth chemical liquid syringe of the present invention, at least a part of the inner surface of the cylinder member is formed of a temperature-sensitive elastic body that changes color depending on the temperature, so that the piston member is press-fitted into the cylinder member to inject the chemical liquid into the subject. Since the cylinder member changes color according to the temperature of the chemical solution, the temperature of the chemical solution injected into the subject can be intuitively adjusted to the operator with a simple structure without requiring a temperature sensor or complicated work. It can be confirmed.

  In the sixth chemical liquid syringe of the present invention, a part of the inner surface of the cylinder member is formed of a pressure-sensitive elastic body that changes color with pressure, and a part thereof is formed of a temperature-sensitive elastic body that changes color with temperature. When the piston member is press-fitted into the cylinder member in order to inject the chemical into the subject, the cylinder member changes color in response to the pressure and temperature of the chemical, so the pressure and temperature of the chemical injected into the subject The operator can be intuitively confirmed with a simple structure without requiring a sensor, a temperature sensor, or a complicated operation.

  In the first extension tube of the present invention, when at least a part of the tube body is formed of a pressure-sensitive elastic body that changes color by pressure, when the drug solution is injected from the drug syringe to the subject through the extension tube, the drug solution Since the tube body changes color in response to the pressure of the liquid, the operator can intuitively check the pressure of the chemical solution injected into the subject with a simple structure without the need for a pressure sensor or complicated work. .

  In the second extension tube of the present invention, when at least a part of the tube body is formed of a temperature-sensitive elastic body that changes color according to temperature, when the drug solution is injected from the drug solution syringe to the subject through the extension tube, the drug solution Since the tube body changes color in response to the temperature, the temperature of the chemical solution injected into the subject can be intuitively confirmed by a simple structure without requiring a temperature sensor or complicated work. .

  In the third extension tube of the present invention, a part of the tube body is formed of a pressure-sensitive elastic body that changes color depending on pressure, and a part thereof is formed of a temperature-sensitive elastic body that changes color depending on temperature. When a drug solution is injected from the syringe to the subject with the extension tube, the tube body changes color according to the pressure and temperature of the drug solution, so the pressure and temperature of the drug solution injected into the subject can The operator can intuitively check with a simple structure without requiring complicated work.

  In the chemical injection device according to the present invention, at least a part of the piston pressing member is formed of a pressure-sensitive elastic body that discolors due to pressure, so that the piston is pressed into the cylinder member by the piston pressing member, thereby supplying the chemical to the subject. When injecting, since the piston pressing member changes color corresponding to the pressure of the chemical solution, the operator can intuitively confirm the pressure of the chemical solution injected into the subject with a simple structure.

[Configuration of the embodiment]
An embodiment of the present invention will be described below with reference to the drawings. As illustrated in FIG. 2, the chemical injection system 1000 according to the present embodiment includes a chemical injection device 100, a chemical syringe 200, an extension tube 300, and an MRI apparatus 400 that is a fluoroscopic imaging apparatus. A chemical solution such as a contrast medium or physiological saline is injected from the chemical solution syringe 200 to the subject to be imaged (not shown) by the chemical solution injection device 100.

  The MRI apparatus 400 includes a fluoroscopic imaging unit 401 and an imaging control unit 402 that are imaging execution mechanisms, and the fluoroscopic imaging unit 401 and the imaging control unit 402 are connected to each other via a communication network 311. The fluoroscopic imaging unit 401 captures a fluoroscopic image from the subject, and the imaging control unit 402 controls the operation of the fluoroscopic imaging unit 401.

  As shown in FIGS. 1 and 4, the chemical syringe 200 includes a cylinder member 210 and a piston member 220, and the piston member 220 is slidably inserted into the cylinder member 210. The cylinder member 210 has a hollow cylinder-shaped transparent cylinder body 211, and a conduit portion 212 is formed on the closed end surface of the cylinder body 211.

  The end face of the cylinder body 211 of the cylinder member 210 is opened, and the piston member 220 is inserted into the cylinder body 211 from this opening. As shown in FIG. 1, the piston member 220 has an elongated piston main body 221, and a piston head 222 is integrally attached to the tip of the piston main body 221.

  A cylinder flange 213 is formed on the outer periphery of the cylinder member 210, and a piston flange 223 is formed on the outer periphery of the piston member 220. The cylinder member 210 is made of glass, resin, or the like, and is filled with a transparent chemical solution such as a contrast medium or physiological saline.

  The extension tube 300 includes a syringe connector 310, an injection needle 320, and a tube main body 330, and the syringe connector 310 and the injection needle 320 are connected by the tube main body 330. The syringe connector 310 is detachably connected to the conduit portion 212 of the chemical syringe 200, and the injection needle 320 is connected by being punctured into the blood vessel of the subject.

  As shown in FIG. 2, the chemical injection device 100 according to the present embodiment includes an injection control unit 101 and an injection head 110 that is an injection head formed separately, and the injection control unit 101 and the injection head 110 communicate with each other. A cable 102 is used for wired connection. The injection head 110 drives the chemical syringe 200 to be attached to inject the chemical into the subject, and the injection control unit 101 controls the operation of the injection head 110.

  Therefore, the injection control unit 101 has a built-in microcomputer (not shown), and is also connected to the imaging control unit 402 of the MRI apparatus 400 by wire. As shown in FIG. 2, the injection control unit 101 includes an operation panel 103, a display panel 104, a speaker unit 105, and the like arranged on the front surface of the main body housing 106, and a separate controller unit 107 is wired with a connection connector 108. It is connected.

  The injection head 110 is movably supported on the upper end of the caster stand 111 by a movable arm 112. As shown in FIG. 1, the upper surface of the front portion of the head main body 113 has an outer shape of the cylinder member 210 of the chemical syringe 200. A corresponding semi-cylindrical concave groove 114 is formed.

  Since the concave groove 114 is formed with a flange holding mechanism 116 that detachably holds the cylinder flange 213 of the chemical syringe 200, the concave groove 114 of the head body 113 and the flange holding mechanism 116 allow the chemical syringe 200 to be A cylinder holding mechanism 117 that holds the cylinder member 210 in a detachable manner is formed.

  A piston drive mechanism 118 including a drive motor and a screw mechanism is disposed behind the concave groove 114 of the injection head 110. The piston drive mechanism 118 is arranged in front and rear as shown in FIGS. The rod member 119 is elongated in the direction, and a piston pressing member 121 is attached to the tip of the rod member 119.

  The rod member 119 is supported so as to be slidable in the front-rear direction. For example, a drive motor is connected to the end of the rod member 119 via a screw mechanism (not shown). For this reason, the piston drive mechanism 118 slides the rod member 119 in the front-rear direction by the power of the drive motor, so that the piston member 220 of the chemical syringe 200 is press-fitted into the cylinder member 210 by the piston pressing member 121 at the tip.

  In the case of injecting a drug solution from the drug solution syringe 200 to the subject through the extension tube 300, the drug solution injection device 100 according to the present embodiment is configured so that the piston member 220 is held by the piston drive mechanism 118 while the cylinder member 210 is held by the cylinder holding mechanism 117 as described above. The pressure of the chemical solution injected into the subject is maintained in an appropriate range by adjusting the pressure.

  In the chemical syringe 200 of this embodiment, the piston head 222 is formed of a pressure-sensitive elastic body that changes color according to pressure. For example, when the acting pressure is equal to or lower than the appropriate pressure of the chemical liquid, the piston head 222 is colorless and transparent. When the pressure is higher than the appropriate pressure, it becomes colored such as blue. Such a pressure-sensitive elastic body is formed, for example, by dispersing microencapsulated low-molecular liquid crystal particles in matrix rubber or matrix elastomer, and is disclosed in Japanese Patent No. 2668509.

[Operation of the embodiment]
In the configuration as described above, when using the drug solution injection system 1000 of the present embodiment, for example, the operator connects the drug solution syringe 200 to the blood vessel of the subject located in the fluoroscopic imaging unit 401 of the MRI apparatus 400 with the extension tube 300. Then, the chemical solution syringe 200 is loaded into the chemical solution injection device 100.

  Then, the cylinder holding mechanism 117 of the chemical liquid injector 100 holds the cylinder member 210 of the chemical liquid syringe 200, and the piston drive mechanism 118 holds the piston member 220. Since the piston member 220 is press-fitted into the cylinder member 210 by the piston drive mechanism 118, a medical solution such as a contrast medium is injected into the subject, so that a fluoroscopic image is captured by the MRI apparatus 400 from the subject into which the medical solution is injected. Is done.

  In the chemical liquid syringe 200 of this embodiment, when the piston member 220 is press-fitted into the cylinder member 210 and the chemical liquid is injected into the subject as described above, the pressure of the chemical liquid acts on the piston head 222. The piston head 222 is colorless and transparent when the acting pressure is less than or equal to the appropriate pressure of the chemical liquid, but becomes colored such as blue when the pressure is higher than the appropriate pressure of the chemical liquid.

  For this reason, in the chemical syringe 200 of this embodiment, the pressure of the chemical solution injected into the subject by the color development of the piston head 222 is appropriate even if the display panel 104 of the chemical injection device 100 that displays the pressure of the chemical solution is not watched. Can be confirmed easily and intuitively.

  In particular, the drug solution syringe 200 according to the present embodiment does not require an expensive and complicated device such as a pressure sensor in order to check the pressure of the drug solution, so that hospital infections can be prevented as disposable as in the past. Moreover, since the pressure of the chemical solution can be confirmed only by using it in the same manner as in the prior art, a complicated operation such as mounting a dedicated device for confirming the pressure is not required.

  Furthermore, in the chemical syringe 200 of this embodiment, the entire piston head 222 is formed of a single pressure-sensitive elastic body that changes color due to pressure. Therefore, the structure is simple, and the color change of the piston head 222 is reduced to the cylinder member 210. Can be easily confirmed from various directions.

[Modification of Embodiment]
The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, the entire piston head 222 is illustrated as being formed of a single pressure-sensitive elastic body. However, since the chemical syringe 200 is filled with various chemical solutions, the pressure-sensitive elastic body is used as the chemical solution. In some cases, it may react.

  Therefore, when this becomes a problem, for example, a cylindrical head body is formed of a pressure-sensitive elastic body, and the head surface of the head body is covered with a head cover formed of a colorless and transparent transparent elastic body. It is possible to form a piston head (not shown). In this case, since the pressure-sensitive elastic body does not come into contact with the chemical liquid, it is possible to prevent the chemical liquid from being altered by this contact.

  In the above embodiment, the entire piston head 222 is illustrated as being formed of a single pressure-sensitive elastic body that changes color with pressure. However, the outer peripheral surface of the piston head 222 that slides when a chemical solution is injected is provided on the outer peripheral surface. Since stress due to friction with the cylinder member 210 also acts, there is a possibility that the outer peripheral surface of the piston head 222 may develop a color different from the pressure of the chemical solution.

  Therefore, if this becomes a problem, for example, it is possible to form the piston head from a normal elastic body and attach a disk of a pressure-sensitive elastic body to the center portion of the tip surface thereof ( Not shown). In this case, since it does not act on the pressure-sensitive elastic body in which the stress due to the friction between the piston head and the cylinder member changes color, the pressure of the chemical solution can be reliably confirmed by the color development of the pressure-sensitive elastic body. Moreover, since it can be formed simply by adding a disc of a pressure-sensitive elastic body that changes color to a conventional chemical syringe, its structure is simple and productivity is good.

  However, in such a chemical syringe, since the pressure-sensitive elastic body that changes color is located only in the central portion of the tip surface of the piston head, it is difficult to confirm the pressure-sensitive elastic body from the side or the rear of the chemical syringe. Become. Therefore, when this becomes a problem, for example, a cylindrical head body is formed of a pressure-sensitive elastic body, and the outer peripheral surface of the head body is covered with a head cover formed of a colorless and transparent transparent elastic body. It is possible to form a piston head (not shown). In this case, the head body made of a pressure-sensitive elastic body that changes color is not easily subjected to stress due to friction between the piston head and the cylinder member, and the head body that changes color due to pressure can be easily confirmed from various directions.

  In the case where the friction with the cylinder member as described above, the visual recognition from various directions, and the reaction with the chemical solution are all problems, for example, a cylindrical head body is formed with a pressure-sensitive elastic body. The piston head can be formed by covering the front end surface and the outer peripheral surface of the head main body with a head cover formed of a colorless and transparent transparent elastic body (not shown).

  In this case, stress due to friction between the piston head and the cylinder member is unlikely to act on the head body made of a pressure-sensitive elastic body that changes color, and the head body that changes color due to pressure can be easily confirmed from various directions. It is possible to satisfactorily prevent the elastic body from coming into contact with the chemical solution.

  Further, in the above embodiment, the piston head 222 of the chemical syringe 200 is illustrated as being formed of a pressure-sensitive elastic body. However, for example, the piston head can be formed of a temperature-sensitive elastic body that changes color depending on temperature (not shown). ) In this case, without requiring an expensive and complicated device such as a temperature sensor, it is possible to easily and intuitively confirm whether or not the temperature of the chemical liquid is appropriate by coloring the piston head.

  Even when such a temperature-sensitive elastic body is used for the piston head, it is preferable that the temperature-sensitive elastic body does not come into contact with the cylinder member or the piston body that is constantly in contact with the outside air. Therefore, when this becomes a problem, for example, the outer peripheral surface and the end surface of the head body formed of a thermosensitive elastic body are covered with a head cover made of a colorless and transparent transparent elastic body to form a piston head. Thus, it is preferable to form the central portion of the tip surface of the piston head with a temperature-sensitive elastic body (not shown).

  It is also possible to use both the temperature-sensitive elastic body and the pressure-sensitive elastic body as described above for the piston head (not shown), and in this case, the subject is injected by coloring the piston head. Both the pressure and temperature of the chemical solution can be confirmed at once. Even when the temperature-sensitive elastic body and the pressure-sensitive elastic body are used for the piston head at the same time, for example, the central portion of the tip surface of the piston head is formed of the pressure-sensitive elastic body and the temperature-sensitive elastic body. Is preferred.

  In this case, for example, the right half of the center part of the tip surface of the piston head is formed of a pressure-sensitive elastic body and the left half is formed of a temperature-sensitive elastic body, or the outside of the center part of the tip surface of the piston head. Is preferably formed of a pressure-sensitive elastic body and the inside is formed of a temperature-sensitive elastic body (both not shown).

  Further, the disk-shaped first body is formed of a temperature-sensitive elastic body, the disk-shaped second body is formed of a pressure-sensitive elastic body, and the second body is joined to the end surface of the first body, and the first body. It is also preferable that the piston head is formed by covering the outer peripheral surface of the second main body with a head cover made of a transparent elastic body (not shown).

  Further, in the above embodiment, the piston head 222 of the chemical syringe 200 is formed with a pressure-sensitive elastic body. For example, a chemical syringe in which the inner peripheral surface of the cylinder member is coated with such a sheet-like pressure-sensitive elastic body. (Not shown) is also possible. In this case, for example, the cylinder member is transparent when the pressure of the chemical liquid is appropriate. However, when the pressure of the chemical liquid becomes abnormal, the cylinder member is colored red or the like, so that the pressure abnormality can be reliably confirmed.

  In addition, a chemical syringe or the like (not shown) in which the inner peripheral surface of the cylinder member is covered with a sheet-like temperature-sensitive elastic body so that a temperature abnormality can be visually confirmed on the cylinder member is also possible. Furthermore, the inner peripheral surface of the cylinder member is covered with a sheet-like pressure-sensitive elastic body, and the inner peripheral surface is covered with a sheet-like temperature-sensitive elastic body, so that a pressure abnormality and a temperature abnormality can be simultaneously checked visually. A liquid syringe that can be used is also possible (not shown).

  In particular, in such a chemical syringe, the temperature of the chemical solution directly acts on the temperature-sensitive elastic body, but the temperature of the cylinder member that is in contact with the outside air does not act directly. In addition, since the stress due to the friction of the piston member does not directly act on the pressure-sensitive elastic body, the pressure of the chemical solution can be confirmed well.

  Furthermore, in the above embodiment, the formation of the piston head 222 of the chemical syringe 200 with a pressure-sensitive elastic body is exemplified. However, for example, the tube body 330 of the extension tube 300 can be formed with such a pressure-sensitive elastic body. Yes (not shown). In this case, since the tube main body 320 changes color corresponding to the pressure of the chemical liquid injected from the chemical syringe 200 to the subject through the extension tube 300, it is easy and sure to confirm whether the pressure of the chemical liquid injected to the subject is appropriate. Can do.

  In addition, when the extension tube 320 of the extension tube 300 is formed of a pressure-sensitive elastic body that discolors with pressure, for example, durability may be a problem. Therefore, when this becomes a problem, the tube body of the extension tube is formed by forming the inner tube with a pressure-sensitive elastic body and covering the outer peripheral surface of the inner tube with an outer tube formed of a colorless and transparent transparent elastic body. Can be formed (not shown).

  In this case, since the durability that is lacking in the pressure-sensitive elastic body that changes color due to pressure can be supplemented by the outer tube, it is possible to improve the durability of the extension tube whose color changes due to the pressure of the chemical solution. it can. Furthermore, since the outer tube prevents the inner tube made of a pressure-sensitive elastic body that changes color due to pressure from expanding due to the pressure of the chemical solution, the tube main body can be more appropriately discolored in response to the pressure of the chemical solution.

  It is also possible to form the tube body of the extension tube with the temperature-sensitive elastic body as described above, and the extension tube is formed by covering the inner tube made of the temperature-sensitive elastic body with the outer tube made of the transparent elastic body. It is also possible to form the tube main body and inner tube of the extension tube with a pressure-sensitive elastic body and a temperature-sensitive elastic body (both not shown).

  When the tube main body is formed of a pressure-sensitive elastic body and a temperature-sensitive elastic body in this way, for example, the tube has a structure in which the pressure-sensitive elastic body and the temperature-sensitive elastic body are alternately arranged in a stripe shape in the longitudinal direction. It is possible that the main body is formed, the end half of the tube main body is formed of a pressure-sensitive elastic body and the tip half is formed of a temperature-sensitive elastic body ( Neither is shown).

  In the above embodiment, the piston head 222 of the chemical syringe 200 is formed with a pressure-sensitive elastic body. For example, the piston pressing member 121 of the chemical injection device 100 may be formed with such a pressure-sensitive elastic body. Is possible. In this case, it is not impossible to form the entirety of the piston pressing member 121 with a pressure-sensitive elastic body that changes color with pressure. For example, a disk formed with a pressure-sensitive elastic body that changes color with pressure is used as the tip of the piston pressing member 121. It is preferable to attach it to the surface (not shown).

It is a fragmentary sectional view which shows the chemical | medical solution syringe of embodiment of this invention. It is a perspective view which shows the external appearance of a chemical injection system. It is a perspective view which shows the external appearance of a chemical injection device. It is a perspective view which shows the state by which a chemical | medical solution syringe is attached or detached to the injection | pouring head of a chemical | medical solution injection device. It is a perspective view which shows the relationship between the piston drive mechanism of a chemical | medical solution injection device, and a chemical | medical solution syringe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Chemical liquid injection device 117 Cylinder holding mechanism 118 Piston drive mechanism 121 Piston press member 200 Chemical liquid syringe 210 Cylinder member 212 Conduit part 220 Piston member 222 Piston head 300 Extension tube 310 Injection needle 320 Syringe connector 330 Tube main body

Claims (22)

A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical syringe formed of a pressure-sensitive elastic body in which at least a part of the piston head is discolored by pressure. A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical syringe formed of a temperature-sensitive elastic body in which at least a part of the piston head changes color depending on temperature. A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical liquid syringe, wherein a part of the piston head is formed of a pressure-sensitive elastic body that changes color by pressure and a part of the piston head is formed of a temperature-sensitive elastic body that changes color by temperature.   The chemical | medical solution syringe of Claim 1 in which the center part of the front end surface of the said piston head is formed with the said pressure sensitive elastic body.   The piston head has a head main body formed of the pressure-sensitive elastic body, and a head cover formed of a colorless and transparent transparent elastic body and covering at least the outer peripheral surface of the head main body. The chemical | medical solution syringe of Claim 4.   The piston head has a head main body formed of the pressure-sensitive elastic body, and a head cover formed of a colorless and transparent transparent elastic body and covering at least the front end surface of the head main body. The chemical | medical solution syringe of Claim 1.   The piston head is formed of the pressure-sensitive elastic body, and the head cover is formed of a colorless and transparent transparent elastic body and covers at least the front end surface and the outer peripheral surface of the head body. The chemical | medical solution syringe of Claim 1 which has.   The chemical | medical solution syringe of Claim 2 with which the center part of the front end surface of the said piston head is formed with the said thermosensitive elastic body.   A head body, wherein the piston head is formed of the temperature-sensitive elastic body; and a head cover formed of a colorless and transparent transparent elastic body and covering at least the outer peripheral surface and the end surface of the head body. The chemical | medical solution syringe of Claim 8 which has.   The chemical | medical solution syringe of Claim 3 by which the center part of the front end surface of the said piston head is formed with the said pressure sensitive elastic body and the said temperature sensitive elastic body.   The piston head is located at the front end surface of the first main body and formed of the temperature-sensitive elastic body, and is joined to the end face of the first main body and formed of the pressure-sensitive elastic body. The chemical | medical solution of Claim 10 which has a 2nd main body and the head cover which is formed with the colorless and transparent transparent elastic body, and has coat | covered at least the outer peripheral surface of the said 1st main body and the said 2nd main body. Syringe. A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical syringe formed of a pressure-sensitive elastic body in which at least a part of the inner surface of the cylinder member is discolored by pressure. A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical syringe formed of a temperature-sensitive elastic body in which at least a part of the inner surface of the cylinder member changes color depending on temperature. A transparent cylinder member having a hollow cylindrical shape with a conduit portion formed at the tip and filled with a chemical solution, and a piston head that seals the inner surface of the cylinder member are attached to the tip. A piston member slidably inserted into the inside from the opening at the end, and a chemical syringe,
A chemical syringe, wherein a part of an inner surface of the cylinder member is formed of a pressure-sensitive elastic body that is discolored by pressure and a part of the cylinder member is formed of a temperature-sensitive elastic body that is discolored by temperature.   The inner peripheral surface of the cylinder member is covered with the sheet-like pressure-sensitive elastic body, and the inner peripheral surface of the pressure-sensitive elastic body is covered with the sheet-like temperature-sensitive elastic body. Drug solution syringe. A syringe connector that is detachably connected to the chemical syringe; an injection needle that is connected to a blood vessel of a subject; and a flexible tube body that connects the syringe connector and the injection needle to flow the chemical solution. An extension tube,
An extension tube formed of a pressure-sensitive elastic body in which at least a part of the tube main body is discolored by pressure. A syringe connector that is detachably connected to the chemical syringe; an injection needle that is connected to a blood vessel of a subject; and a flexible tube body that connects the syringe connector and the injection needle to flow the chemical solution. An extension tube,
An extension tube in which at least a part of the tube body is formed of a temperature-sensitive elastic body that changes color depending on temperature. A syringe connector that is detachably connected to the chemical syringe; an injection needle that is connected to a blood vessel of a subject; and a flexible tube body that connects the syringe connector and the injection needle to flow the chemical solution. An extension tube,
An extension tube in which a part of the tube body is formed of a pressure-sensitive elastic body that changes color by pressure and a part of the tube body is formed of a temperature-sensitive elastic body that changes color by temperature.   The tube main body has an inner tube formed of the pressure-sensitive elastic body and an outer tube formed of a colorless and transparent transparent elastic body and covering the outer peripheral surface of the inner tube. The extension tube according to claim 16.   The tube body includes an inner tube formed of the temperature-sensitive elastic body and an outer tube formed of a colorless and transparent transparent elastic body and covering the outer peripheral surface of the inner tube. The extension tube according to claim 17.   The tube main body is formed of an inner tube formed of the pressure-sensitive elastic body and the temperature-sensitive elastic body, and an outer tube formed of a colorless and transparent transparent elastic body covering the outer peripheral surface of the inner tube. The extension tube according to claim 18. Chemical liquid injection comprising: a cylinder holding mechanism that detachably holds a cylinder member of a chemical liquid syringe; and a piston drive mechanism that presses the piston member against the held cylinder member with a slidable piston pressing member. A device,
A chemical injection device in which at least a part of the piston pressing member is formed of a pressure-sensitive elastic body that changes color by pressure.

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