JP5053093B2 - Chemical injection tool - Google Patents

Description

  The present invention relates to a drug solution injection tool used to inject a drug solution into a blood vessel, and more particularly to a drug solution injection tool in which a flexible outer needle is placed in a blood vessel.

  When injecting a chemical solution into a blood vessel of a subject, an injection needle may be directly attached to a chemical solution container in which a piston member is slidably inserted into a cylinder member, and the injection needle may be punctured directly into the blood vessel. However, such a method is not practical when injecting for a long time or injecting a large volume of chemical. Accordingly, in such a case, the drug solution container and the injection needle are connected via a flexible extension tube, and the injection needle attached to the distal end portion of the extension tube is fixed to the subject.

  Further, when the subject is a long-term hospitalized patient, the needle may be punctured many times. In such a case, an indwelling needle is used that places a slight burden on the subject even if it is placed in a blood vessel.

  Further, when a fluoroscopic image of a subject is captured by a fluoroscopic imaging device such as a CT (Computed Tomography) scanner or an MRI (Magnetic Resonance Imaging) device, it is generally performed to inject a contrast medium into the blood vessel of the subject. However, since a fluoroscopic image may be taken for a long time, an indwelling needle may be used to inject a contrast medium in such a case.

  One conventional example of the indwelling needle as described above will be described below with reference to FIGS. Here, the indwelling needle 10 exemplified as a chemical solution injection tool includes an outer needle 11, an inner needle 12, and a tubular member 13. The outer needle 11 is formed in a tubular shape with a flexible member, for example, a silicone resin. The inner needle 12 is formed of a hard member, such as a stainless alloy, into a sharp needle shape, and the inner needle 12 is inserted into the outer needle 11.

  The tubular member 13 is formed in a tubular shape having a front end and a rear end opened with a hard and transparent resin or the like. The rear end of the outer needle 11 is integrally connected to the opening at the front end of the tubular member 13. Further, a packing 14 that is an elastic member is attached to the opening at the rear end of the tubular member 13, and the inner needle 12 passes through the packing 14. The packing 14 seals the opening at the rear end of the tubular member 13, and a knob-like portion 16 is formed integrally with the rear portion of the inner needle 12 protruding from the packing 14.

  The tubular member 13 has a tubular portion that extends integrally from its side and is open at the tip. A front end of a separate flexible extension tube 17 is detachably attached to the tubular portion by a joint 18. A chemical solution container (not shown) such as a chemical solution syringe or a chemical solution bottle is detachably attached to the rear end of the extension tube 17. The extension tube 17 is provided with an exhaust valve (not shown) that is a bubble removing means, and this exhaust valve excludes bubbles from the liquid inside the extension tube 17.

  When using the indwelling needle 10 having the above-described structure, as shown in FIG. 12A, the inner needle 12 is disposed inside the outer needle 11 and protrudes from the outer needle 11. The needle 12 is punctured into the blood vessel of the subject (not shown).

Next, drawn knob-like portion 16, the inner needle 12 is withdrawn from the outer needle 11 and the tubular member 13 as shown in FIG. 1 2B. Then, the inside of the outer needle 11 and the tubular member 13 is filled with the blood of the inflowing subject. When the inner needle 12 is pulled out in this way, the hole formed in the packing 14 by the inner needle 12 is closed by the elasticity of the packing 14 itself.

  Next, as shown in FIG. 12C, the chemical container is connected to the rear end, and the front end of the extension tube 17 filled with the chemical is connected to the tubular member 13. Further, when the extension tube 17 is connected, bubbles are excluded from the liquid inside the tubular member 13 and the extension tube 17 by the exhaust valve provided in the extension tube 17.

In such a state, the chemical solution can be injected from the chemical solution container into the blood vessel of the subject via the extension tube 17 and the indwelling needle 10. The outer needle 11 is pierced into a blood vessel than is flexible, physical burdens of the subject while inject the liquid is reduced. The outer needle 11 is flexible, but when the blood vessel is punctured, the inner side is held by the hard inner needle 12, so that the outer needle 11 can be easily punctured into the blood vessel.

  However, in the indwelling needle 10 as described above, the pulled out inner needle 12 may injure the subject or the operator by mistake. If the subject is affected, if the worker is injured by the pulled out inner needle 12, it may cause secondary infection.

  Therefore, in order to prevent the above-described accident, an indwelling needle having a cover member that accommodates the extracted inner needle has been proposed (for example, see Patent Documents 1 to 4).

Patent Document 1: Japanese Patent Application Laid-Open No. 07-328116 Patent Document 2: Japanese Patent Application Laid-Open No. 09-000629 Patent Document 3: Japanese Patent Application Laid-Open No. 10-015074 Patent Document 4: Japanese Patent Application Laid-Open No. 10-028739 Each of the needles (not shown) requires a dedicated manual operation for accommodating the inner needle inside the cover member. For this reason, the operator may be injured by the inner needle during this operation, and if the user forgets this operation, the inner needle remains exposed.

  An indwelling needle in which a sheath-like cover member that expands and contracts in two stages is attached to the rear end opening of the tubular member and the rear end of the inner needle is fixed to the inner rear end of the contracted cover member is also commercially available. Yes. In this indwelling needle, when the subject is punctured with the outer needle together with the outer needle and then the cover member is extended and separated from the tubular member, the pulled out inner needle is positioned inside the extended cover member.

  However, this indwelling needle has poor productivity due to the complicated structure of the cover member. Furthermore, extending the hard cover member in two stages while the outer needle is punctured on the subject has a high possibility of causing trouble to the subject because the operation is complicated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a drug solution injector that can reliably cover an inner needle pulled out from an outer needle with a simple structure.

The drug solution injection tool of the present invention has an outer needle, an inner needle, a tubular member, and a cover member, and is used for injecting a drug solution into a blood vessel. Outer needle is at least the front Ri flexible der is placed in the vessel. Inner needle before part hard der so that has a rigid needle body and a flexible guide wire, is punctured front portion disposed in the outer needle into the blood vessel. In the tubular member, the rear end portion of the outer needle is integrally connected to the front end opening, and the rear portion of the inner needle protrudes from the rear end opening. The cover member is closed and the rigid cover that covers at least the front end of the needle body, the extensible bellows structure such that the length to accommodate the entire inner needle in a stretched state when the inner needle is withdrawn from the tubular member and bellows cover, and have a rear end portion of the inner needle is fixed to the rear end, and the front end portion is detachably attached to the rear end opening of the tubular member.

  Therefore, in the drug solution injector of the present invention, the cover member is pulled away from the tubular member by pulling the rear end of the cover member while the outer needle is punctured into the blood vessel of the subject together with the inner needle. Then, the inner needle is pulled out from the outer needle and the tubular member and accommodated in the cover member. Accordingly, the inner needle can be automatically accommodated in the cover member with a simple configuration without requiring an operation only for accommodating the inner needle in the cover member.

  In addition, each component as used in the field of this invention does not necessarily need to exist independently. For example, a plurality of constituent elements may be formed as one member, a certain constituent element may be a part of another constituent element, or a part of a certain constituent element and one of the other constituent elements. The part may overlap.

  Further, in the present invention, the front-rear direction is defined, but this is defined for convenience in order to briefly explain the relative relationship of each component, and at the time of manufacturing or using the present invention. It does not limit the direction. Further, the front part in the present invention means a part from the front end to an arbitrary position toward the rear end, and the rear part means a part from the rear end to an arbitrary position toward the front end. .

It is a vertical side view of the indwelling needle which is one Embodiment of the chemical | medical solution injection tool of this invention, and shows the state before a test subject punctures. It is a vertical side view of the indwelling needle which is one Embodiment of the chemical | medical solution injection tool of this invention, and shows the state by which the inner needle was extracted. It is a disassembled perspective view which shows the connection relation of the indwelling needle, the chemical | medical solution syringe which is a chemical | medical solution container, and the injection | pouring head of a chemical | medical solution injection apparatus. It is a perspective view which shows the external appearance of a chemical injection device. It is a perspective view which shows the external appearance of a chemical injection system. It is a vertical side view of the 1st modification of the indwelling needle shown to FIG. 1A, and shows the state before a test subject punctures. It is a vertical side view of the 1st modification of the indwelling needle shown in Drawing 1A, and shows the state where the inner needle was pulled out. It is a vertical side view of the 2nd modification of the indwelling needle shown to FIG. 1A, and shows the state before a test subject punctures. It is a vertical side view of the 2nd modification of the indwelling needle shown in Drawing 1A, and shows the state where the inner needle was pulled out. It is a vertical side view of the 3rd modification of the indwelling needle shown to FIG. 1A, and shows the state before a test subject punctures. It is a vertical side view of the 3rd modification of the indwelling needle shown in Drawing 1A, and shows the state where the inner needle was pulled out. It is a vertical side view of the 4th modification of an indwelling needle shown in Drawing 1A, and shows a state before a subject punctures. It is a vertical side view of the 4th modification of an indwelling needle shown in Drawing 1A, and shows the state where an inner needle was pulled out. It is a vertical side view of the 5th modification of an indwelling needle shown in Drawing 1A, and shows a state before a subject punctures. It is a vertical side view of the 5th modification of the indwelling needle shown in Drawing 1A, and shows the state where the inner needle was pulled out. It is a vertical side view of the 6th modification of the indwelling needle shown to FIG. 1A, and shows the state before a test subject punctures. It is a vertical side view of the 6th modification of the indwelling needle shown in Drawing 1A, and shows the state where the inner needle was pulled out. It is a vertical side view of the 7th modification of the indwelling needle shown to FIG. 1A, and shows the state before a test subject punctures. It is a vertical side view of the 7th modification of an indwelling needle shown in Drawing 1A, and shows the state where an inner needle was pulled out. It is a vertical side view of the indwelling needle of one prior art example, and shows the state before being punctured by a subject. It is a vertical side view of the indwelling needle of one prior art example, and shows the state where the inner needle has been pulled out. It is a vertical side view of the indwelling needle of one prior art example, and shows the state where the chemical solution container is connected.

Explanation of symbols

200 Chemical liquid syringe 300 Indwelling needle 310 Outer needle 320 Inner needle 330 Tubular member 333 Packing 340 Cover member 350 Extension tube 513 One-way valve 522 Manual valve 531 Sealing cap 545 Automatic valve 552 Hard cover 553 Bellows cover

  One embodiment of the present invention is described below with reference to FIGS. 1A, 1B and 2-4. The chemical injection system 1000 of this embodiment includes a chemical injection device 100, chemical syringes 200C and 200P that are chemical containers (hereinafter simply referred to as 200 if they are not distinguished), and an indwelling needle 300 that is a chemical injection tool. And an MRI apparatus 400 which is a fluoroscopic imaging apparatus. The MRI apparatus 400 includes a fluoroscopic imaging unit 401 and an imaging control unit 402 that are imaging execution mechanisms. The fluoroscopic imaging unit 401 captures a fluoroscopic image of a subject (not shown), and the imaging control unit 402 controls the operation of the fluoroscopic imaging unit 401.

  As shown in FIG. 2, the chemical liquid syringe 200 includes a cylinder member 210 and a piston member 220 that is slidably inserted into the cylinder member 210. The cylinder member 210 has a cylindrical hollow main body portion 211, and a conduit portion 212 is formed at the closed front end of the main body portion 211.

  The rear end of the main body 211 of the cylinder member 210 is opened, and the piston member 220 is inserted into the main body 211 from this opening. A cylinder flange 213 is formed on the outer periphery of the rear end of the cylinder member 210. A piston flange 221 is formed on the outer periphery of the rear end of the piston member 220.

  The chemical syringe 200 includes a contrast syringe 200C filled with a contrast agent as a chemical solution and a physiological saline syringe 200P filled with a physiological saline as a chemical solution. The drug solution injection device 100 can simultaneously attach the contrast syringe 200C and the physiological saline syringe 200P one by one.

  As shown in FIG. 3, the chemical liquid injector 100 includes an injection control unit 101 and an injection head 110 that are configured separately from each other. The injection control unit 101 and the injection head 110 are connected by wire with a communication cable 102. The injection head 110 operates the chemical solution syringe 200 to be attached and injects the chemical solution to the subject. The injection control unit 101 controls the operation of the injection head 110.

  The injection head 110 is attached to the upper end of the caster stand 111 via the movable arm 112. The injection head 110 has a head main body 113, and two semi-cylindrical concave portions 114 to which the chemical syringe 200 is detachably attached are formed on the upper surface of the head main body 113. Each recess 114 is formed with a groove-like cylinder holding mechanism 116 that detachably holds the cylinder flange 211 of the chemical syringe 200. A chemical solution injection mechanism 117 that holds and slides the piston flange 221 is disposed behind each recess 114.

  Each chemical solution injection mechanism 117 has an ultrasonic motor (not shown) that does not generate a magnetic field even when activated as a drive source, and slides the piston member 220 by a screw mechanism (not shown) or the like.

  Since the contrast syringe 200C and the physiological saline syringe 200P are individually attached to each recess 114 of the injection head 110, the contrast that injects the contrast agent into the subject by the two recesses 114 and the two drug solution injection mechanisms 117 is provided. An injection mechanism 117C and a saline injection mechanism 117P for injecting physiological saline are configured.

  In the chemical injection device 100 of this embodiment, at least each part of the injection head 110 is formed of a nonmagnetic material, and portions that cannot be formed of a nonmagnetic material are magnetically shielded. For example, ultrasonic motors are made of non-magnetic metal such as phosphor bronze alloy (Cu + Sn + P), titanium alloy (Ti-6Al-4V), magnesium alloy (Mg + Al + Zn), etc. The head main body 113 and the like are made of nonmagnetic resin.

  The injection control unit 101 has a main body housing 106, and an operation panel 103, a touch panel 104, a speaker unit 105, and the like are arranged on the front surface thereof. Also, a separate controller unit 107 is wired to the injection control unit 101 via a connection connector 108. In the liquid injector 100 of this embodiment, the operation of the injection head 110 is basically controlled by a manual input operation to the injection control unit 101, but an operation panel 118 that accepts a simple manual input operation is provided on the upper rear portion of the injection head 110. Also formed.

  Moreover, the indwelling needle 300 of this form has the outer needle 310, the inner needle 320, the tubular member 330, the cover member 340, and the extension tube 350 as main components, as shown to FIG. 1A. The outer needle 310 is formed in a thin tubular shape that can be easily bent by a flexible silicone resin, but is difficult to expand and contract.

  The inner needle 320 has a needle body 321 and a guide wire 322. The needle body 321 is formed with a sharp shape, for example, with a hard stainless alloy. The guide wire 322 is formed of, for example, a metal wire that is flexible but difficult to expand and contract. The front end of the guide wire 322 is integrally connected to the rear end of the needle body 321.

  The needle body 321 is formed in a hollow tubular shape in which a flow path 323 communicates from the front end to the rear end. A guide wire 322 is inserted into the opening at the rear end of the needle body 321 and is fixed by caulking or bonding. By fixing the guide wire 322, the rear end of the flow path 323 of the needle main body 321 is closed, but an opening 324 communicating with the flow path 323 is formed on the rear side surface of the needle main body 321.

  The tubular member 330 has an outer needle support tube 331 and a branch tube 332 that are formed in a hollow structure in which the front end and the rear end are open. The outer needle support tube 331 is made of, for example, a flexible resin, and the branch tube 332 is made of, for example, a hard resin. The rear end of the outer needle support pipe 331 and the front end of the branch pipe 332 are integrally connected to each other so that the openings are communicated with each other, thereby forming a hollow tubular member 330 having a front end and a rear end opened as a whole. Has been.

  The outer needle support tube 331 is formed, for example, so as to be easily curved but difficult to expand and contract. The rear end of the outer needle 310 is integrally connected to the front end of the outer needle support tube 331, whereby the openings are in communication with each other. As shown in FIG. 1A, in the indwelling needle 300 in the shipped state, the needle body 321 of the inner needle 320 is inserted into the outer needle 310, and the front end of the inner needle 320 protrudes from the front end of the outer needle 310.

  The guide wire 322 passes through the outer needle support tube 331 and the branch tube 332 of the tubular member 330 and protrudes from the rear end opening of the branch tube 332. For example, a silicone resin packing 333 is attached to the rear end opening of the branch pipe 332 as an elastic member. A guide wire 322 passes through the packing 333. The packing 333 opens the rear end opening of the branch pipe 332 by its own elasticity even when the inner needle 320 is penetrated as shown in FIG. 1A or when the inner needle 320 is pulled out as shown in FIG. 1B. It is sealed.

  In the indwelling needle 300 of this embodiment, the cover member 340 has a bellows structure that can be expanded and contracted in the front-rear direction, and the inner needle 320 is disposed therein. The inner needle 320 and the cover member 340 are fixed at the rear end. The rear end portion of the cover member 340 is formed as a knob-shaped portion 341 that can be easily gripped.

  A front end portion 342 of the cover member 340 is formed in a cylindrical shape, and is detachably attached to the rear end opening of the branch pipe 332. That is, the cover member 340 has a structure in which the front end portion 342 and the knob-shaped portion 341 that are difficult to expand and contract are integrally formed on the front and rear of the expandable bellows portion 343.

  The cover member 340 is formed to be longer than the length of the inner needle 320 in the extended state, as shown in FIG. 1B. Therefore, in a state where the cover member 340 is extended and the inner needle 320 is separated from the tubular member 330 together with the cover member 340, the entire inner needle 320 is accommodated inside the cover member 340. In other words, as shown in FIG. 1A, in the indwelling needle 300 in the shipping state, the cover member 340 is compressed to the length of the inner needle 320 protruding rearward from the tubular member 330.

When the cover member 340 is formed of an elastic material such as silicone resin, if the cover member 340 is left as it is, the cover member 340 changes from a compressed state to an expanded state due to the elasticity of the cover member 340 itself. Therefore, in the indwelling needle 300 of this embodiment, the force necessary for moving the rear end of the cover member 340 (extending the cover member 340) in order to pull out the inner needle 320 from the rear end of the outer needle 310 is compressed by C. When the force acting on the inner needle 320 by the cover member 340 in the state is D,
C> D
The dimensions and the like of each part are adjusted so as to satisfy the following relationship.

More specifically, as shown in FIG. 1A, in the indwelling needle 300 in the shipped state, the inner needle 320 is held by the frictional force between the outer needle 310 and the packing 333, so that the inner needle 320 can be pulled out. A force exceeding at least this frictional force is required. This force corresponds to the above-mentioned force C. In such a state, the force that the cover member 340 tries to expand acts on the fixed portion of the inner needle 320 with the cover member 340 as the above-described force D by the cover member 340 in a compressed state. And in the indwelling needle 300 of this form, the dimension, material, surface treatment, etc. of each part are defined so that the above-mentioned forces C and D may satisfy “C> D”.

  In the indwelling needle 300 of this embodiment, the branch pipe 332 of the tubular member 330 is formed in a so-called bifurcated structure, and a branch part 335 extending rearward from the side part is integrally formed. The branch portion 335 has an inlet opening as an opening communicating with the inside of the branch pipe 332, and the tip of the extension tube 350 is integrally connected thereto by a joint 351.

  As shown in FIG. 2, the extension tube 350 is also bifurcated. The contrast syringe 200C is detachably attached to one end of the extension tube 350, and the physiological saline syringe 200P is detachably attached to the other end. In the indwelling needle 300 of this embodiment, the tubular member 330 and the extension tube 350 are filled with physiological saline at the time of shipment, and a sealing cap (not shown) is detachable at the end of the extension tube 350 ( It is attached to separable. Further, the extension tube 350 is provided with an exhaust valve (not shown) as a bubble removing means at a predetermined position.

  In the configuration as described above, when using the liquid injector 100 of this embodiment, the operator places and uses the liquid injector 100 in the vicinity of the imaging unit 401 of the MRI apparatus 400 as shown in FIG. A contrast syringe 200C, a physiological saline syringe 200P, an indwelling needle 300, and the like are prepared.

  Next, as shown in FIG. 2, the sealing cap is removed from the two ends of the extension tube 350, and the contrast syringe 200C and the saline syringe 200P are connected to the two ends, respectively. As described above, the indwelling needle 300 is filled with physiological saline in advance including the extension tube 350. Therefore, when the contrast syringe 200 </ b> C and the saline syringe 200 </ b> P are connected to the extension tube 350, no air exists in the contrast syringe 200 </ b> C, the saline syringe 200 </ b> P, and the indwelling needle 300.

  In the indwelling needle 300 of this embodiment, since the needle body 321 is formed with a flow path 323 that connects the tip of the inner needle 321 and the inside of the tubular member 330, the blood vessel (not shown) of the subject is punctured. It is also possible to perform air bleeding while the inner needle 321 is not pulled out from the outer needle 310.

  Then, as described above, the outer needle 310 and the inner needle 320 of the indwelling needle 300 are punctured into the blood vessel of the subject in a state where there is no air inside the contrast syringe 200C, the physiological saline syringe 200P, and the indwelling needle 300. Thereafter, the knob-shaped portion 341 is pulled out, and the inner needle 320 is pulled out from the outer needle 310 and the tubular member 330. Next, the chemical injection device 100 slightly retracts the piston member 220 of the physiological saline syringe 200P by the saline injection mechanism 117P while the piston member 220 of the contrast syringe 200C is fixed by the contrast injection mechanism 117C.

  At this time, if the outer needle 310 of the indwelling needle 300 is appropriately punctured into the blood vessel, the blood of the subject flows into the tubular member 330. When the inflow of blood into the inside of the transparent tubular member 330 is visually confirmed, it is confirmed that the outer needle 310 is properly punctured into the blood vessel.

  When this is confirmed, for example, the contrast medium and the physiological saline are sequentially injected into the blood vessel of the subject by the chemical solution injection device 100, and a fluoroscopic image is taken from the subject by the MRI device 400. At this time, since the inner needle 320 is pulled out from the outer needle 310 and the tubular member 330, the contrast agent and physiological saline pass through the extension tube 350, the tubular member 330, and the outer needle 320 in this order. Infused into blood vessels. Although there is a possibility that air bubbles may enter when connecting the contrast syringe 200C and the physiological saline syringe 200P to the indwelling needle 300 as described above, the air bubbles are excluded to the outside by the exhaust valve of the indwelling needle 300.

  In the indwelling needle 300 of this embodiment, when the inner needle 320 is pulled out from the outer needle 310 and the tubular member 330 punctured by the subject as described above, the compressed cover member 340 is, as shown in FIG. 1B. The entire inner needle 320 that is stretched and pulled out by the elasticity is accommodated.

Thereafter, the operator removes the cover member 340 from the tubular member 330 and discards the inner needle 320 accommodated in the cover member 340. Therefore, it is possible to prevent secondary infection from occurring when the inner needle 320 is punctured by an operator. Moreover, in the indwelling needle 300 of the present embodiment, when the inner needle 320 is pulled out from the outer needle 310 and the tubular member 330, the cover member 340 naturally expands by its own elasticity, and the entire inner needle 320 is automatically accommodated. Is done. Therefore, the work dedicated to the cover member 340 to accommodate the inner needle 320 is not required.

  Furthermore, since the cover member 340 maintains the state in which the inner needle 320 is accommodated, for example, the inner needle 320 is not exposed even when the front end of the cover member 340 is positioned above or below. For this reason, an operator does not contact the inner needle 320 to which the blood of the subject has adhered, and the inner needle 320 can be discarded easily and safely.

  In addition, since there is a relationship “C> D” between the force C required to pull out the inner needle 320 and the force D acting on the inner needle 320 by the cover member 340 in a compressed state, the cover member The inner needle 320 is not pulled out by the elastic force of 340 regardless of the operator's intention.

  Moreover, the inner needle 320 is formed of a hard needle body 321 only at the front end and most of the inner needle 320 is formed of a flexible guide wire 322. The entire inner needle 320 is accommodated in the flexible cover member 340. In this state, the guide wire 322 of the inner needle 320 may be wound together with the cover member 340 and discarded (not shown).

  Furthermore, since the rear end opening of the tubular member 330 from which the inner needle 320 has been pulled out is automatically closed by the packing 333, the blood of the subject does not adhere to the operator, and the occurrence of secondary infection is good. Can be prevented.

  In addition, in the indwelling needle 300 of this embodiment, since the outer needle 310, the tubular member 330, and the extension tube 350 are integrally connected as described above, the tubular needle is inserted into the blood vessel of the subject. There is no need to connect the extension tube 350 to the member 330, and the operation is easy.

  Further, even when a high-viscosity contrast agent is injected at a high pressure, the chemical solution does not leak from the connection portion between the extension tube 350 and the tubular member 330. Moreover, since it is not necessary to reversely flow the blood of the subject from the outer needle 310 to the tubular member 330 in order to eliminate bubbles from the inside, the blood does not leak out.

  In addition, the inside of the extension tube 350 and the tubular member 330 is pre-filled with physiological saline as a chemical solution, and the extension tube 350 is equipped with an exhaust valve for removing bubbles from the liquid. When connected to the blood vessel, bubbles can be easily removed from the inside.

  Furthermore, since the end of the extension tube 350 has a bifurcated structure, the contrast syringe 200C and the physiological saline syringe 200P can be connected to the indwelling needle 300 simultaneously. For this reason, it is possible to reliably inject the contrast medium and the physiological saline into the blood vessel of the subject with a simple structure, and contribute to the imaging of the fluoroscopic image with the MRI apparatus 400.

  This invention is not limited to the said form, A various change is accept | permitted in the range which does not deviate from the summary.

  For example, in the above embodiment, the cover member 340 is formed of an elastic material that is elastically expanded from the compressed state, and the force C necessary for pulling out the inner needle 320 and the inner needle 320 by the cover member 340 in the compressed state. In the relationship with the acting force D, it is exemplified that “C> D” is satisfied.

However, like the indwelling needle 500 illustrated in FIGS. 5A and 5B, the cover member 501 is formed so as to maintain the compressed state and the expanded state by plastic deformation or the like. Between the force A required to stretch the cover member 501 by pulling the end rearward and the force B required to separate the front end portion 502 of the cover member 501 from the rear end opening of the tubular member 505,
A <B
It is possible to satisfy the following relationship.

  In this case, when the rear end of the cover member 501 is pulled by the operator in order to pull out the inner needle 320, the cover member 501 is expanded with its tip connected to the tubular member 505. When the inner needle 320 is pulled out of the tubular member 505 and the cover member 501 is extended to the limit, the operator pulls the cover member 501 with a force larger than the force B described above. As a result, the cover member 501 is separated from the tubular member 505 while maintaining the extended state.

  Therefore, the entire pulled out inner needle 320 can be accommodated in the cover member 501 without requiring a dedicated work. As a result, the inner needle 320 is prevented from being pulled out regardless of the operator's intention. Note that the above-described force A may be a force when the front end and the rear end are separated from each other in order to change the cover member 501 from the compressed state to the expanded state, and the force B is the force of the cover member 501 to separate from the tubular member 505. A force for pulling the front end portion 502 may be sufficient.

  In an indwelling needle 500 having a cover member 501 configured to maintain a compressed state and an expanded state, respectively, to ensure that the cover member 501 is separated from the tubular member 505 after being extended to the limit. It is preferable to form irregularities 503 and 506 that elastically engage with each other on the rear end portion of the tubular member 505 and the front end portion 502 of the cover member 501. The cover member 501 that maintains the compressed state and the stretched state can be formed of, for example, a material and a structure equivalent to a straw having a commercially available bellows structure.

  Moreover, in the said form, the front-end part 342 of the cover member 340 was formed in the simple cylindrical shape, and illustrated that the front-end | tip of the inner needle 320 accommodated in the cover member 340 is located behind the through-hole of the front-end part 342. . However, like the indwelling needle 500 illustrated in FIGS. 5A and 5B, the front end portion 502 of the cover member 501 is formed as an elastic member whose inner hole 320 is elastically closed when the inner needle 320 is accommodated in the cover member 501. It is also possible to keep it. In this case, since it can prevent more reliably that the inner needle 320 accommodated in the cover member 501 is exposed, the inner needle 320 can be discarded further safely.

  Further, like the indwelling needle 510 illustrated in FIGS. 6A and 6B, a through hole of the front end portion 512 is opened on the rear surface of the front end portion 512 of the cover member 511 and the inner needle 320 is present on the front end portion 512. When the inner needle 320 is accommodated in the cover member 511, the one-way valve 513 can be integrally formed to automatically close the through hole of the front end portion 512. Such a one-way valve 513 can be realized, for example, by integrally forming a thin film swingable in the front-rear direction on the rear surface of the front end portion 512 in which a through hole is formed in the front-rear direction.

  Moreover, in the said form, packing 333 which is an elastic member was mounted | worn with the rear-end opening of the tubular member 330, and when the inner needle 320 was pulled out, it illustrated that the through-hole of the packing 333 was sealed elastically. However, like the indwelling needle 510 illustrated in FIGS. 6A and 6B, the inner needle 320 is opened at the rear end opening of the tubular member 515 in a state where the inner needle 320 exists in the tubular member 515, and the inner needle 320 is opened. A one-way valve 516 may be attached that is closed by being pulled out of the valve.

  Further, as in the indwelling needle 520 illustrated in FIGS. 7A and 7B, a manual valve 522 that can be opened and closed by manual operation can be integrally attached to the distal end portion 342 of the cover member 521. In this case, as shown in FIG. 7A, the inner needle 320 is inserted into the opened manual valve 522, and the manual operation of the operation lever 523 is performed after the inner needle 320 is received in the cover member 521 as shown in FIG. 7B. The manual valve 522 is preferably closed by operation.

  Further, a manual valve 526 is attached to the rear end opening of the tubular member 525. As shown in FIG. 7A, the inner needle 320 is inserted into the opened manual valve 526, and as shown in FIG. It is also possible to close the manual valve 526 by manually operating the operation lever 527 after the needle 320 is pulled out.

  8A and 8B, a sealing cap 531 to be attached to the front end portion 342 of the cover member 340 is prepared like the indwelling needle 530 illustrated in FIG. 8A, and the cover containing the inner needle 320 is prepared as shown in FIG. 8B. It is also possible to attach a sealing cap 531 to the front end portion 342 of the member 340. Such a sealing cap 531 is preferably connected to the cover member 340 with a flexible lead 532 as shown in the figure.

  Further, a sealing cap 535 to be attached to the rear end opening of the tubular member 330 is prepared. As shown in FIG. 8B, after the inner needle 320 is pulled out, the sealing cap 535 is manually inserted into the rear end opening of the tubular member 330. It is also possible to wear.

  Such a sealing cap 535 is also preferably connected to the tubular member 330 or the like with a flexible lead 536.

  The structure for closing the front end opening of the cover member 340 and the like as described above, and the structure for closing the opening after the inner needle 320 is pulled out can be used in combination of the types shown in FIGS. It is.

  Furthermore, in the said form, it illustrated that the rear-end opening of the tubular member 330 in which the inner needle 320 was inserted, and the injection inlet to which the extension tube 350 was connected were formed separately. However, like the indwelling needle 540 illustrated in FIGS. 9A and 9B, the extension tube 350 is connected to the rear end opening of the tubular member 541 into which the inner needle 320 is inserted as an injection port. May be.

  In such an indwelling needle 540, the automatic valve 545 that is closed when the inner needle 320 is pulled out and the extension tube 250 is not connected and is opened when the extension tube 350 is connected is provided at the rear end of the tubular member 330. It may be attached to the opening. Such an automatic valve 545 is pressed into the through hole of the packing 542 by moving by being pressed by the packing 546 which is elastically closed when the inner needle 320 is pulled out and the joint 548 of the extension tube 350, for example. And an insertion tube 547.

  Further, the one-way valve 516 or the manual valve 511 may be mounted on the rear end opening of the indwelling needle 540 or the branching part 335 of the indwelling needle 300 or the like instead of the automatic valve 545. A plurality of valves may be mounted in combination. Moreover, various closing means such as the indwelling needles 300 and 540 described above can be used together. For example, a sealing cap may be attached to a tubular member or a cover member that is automatically closed by packing.

  Further, the automatic valve 545 as described above may be attached to the inlet of the branch portion 335 of the indwelling needle 300 described above, and the extension tube 350 may be detachably attached thereto. Further, in the above embodiment, the exhaust valve that is the bubble exclusion means is exemplified in the extension tube 350, but such an exhaust valve may be provided in the tubular member.

  Further, in the above embodiment, the entire cover member 340 is illustrated as having a bellows structure. However, like the indwelling needle 550 illustrated in FIGS. 10A and 10B, the cover member 551 includes a hard cover 552 and a bellows cover 553. You may have. In the indwelling needle 550, the hard cover 552 and the bellows cover 553 are connected to each other at their front end portions, and the rear portion of the hard cover 552 is located inside the bellows cover 553.

  The hard cover 552 has the same total length as the needle body 321 of the inner needle 320. Thereby, the hard needle body 321 can be reliably covered with the hard cover 552. Furthermore, since the bellows cover 553 extends to the full length equivalent to the total of the inner needle 320 and the guide wire 322, the flexible guide wire 322 can be covered with the flexible bellows cover 553, and in this covered state, the whole is covered. It can be rolled up.

  In FIGS. 10A and 10B, the case where the hard cover 552 of the cover member 551 has a length equivalent to that of the needle body 321 is taken as an example. However, in the hard cover 552, the inner needle 320 is pulled from the outer needle 310 and the tubular member 330. What is necessary is just to have sufficient length to cover at least the front-end part of the needle | hook main body 321 when it is extracted.

11A and 11B, a hard cover 562 of the cover member 561 may be slidably mounted inside the front end of the bellows cover 563. In this indwelling needle 560, the maximum force E required to slide the hard cover 562 with respect to the bellows cover 563, the guide wire 322, and the inner needle 321; and the force F required to extend the bellows cover 563; Between the force G required to separate the hard cover 562 from the tubular member 330,
E <F <G
It is preferable that the following relationship is satisfied.

  In such an indwelling needle 560, when an operator pulls the rear end of the cover member 651 rearward in order to pull out the inner needle 321 from the outer needle 310, the worker moves over the hard cover 562 that is initially connected to the tubular member 330. The bellows cover 563 is retracted while being compressed. Further, when the operator pulls the rear end of the cover member 651, the flange portion formed at the rear end of the hard cover 562 collides with the front end of the bellows cover 563, and the hard cover 562 is connected to the tubular member 330 thereafter. As it is, the bellows cover 563 is extended to the same length as the guide wire 322.

  Further, when the operator pulls the rear end of the cover member 651, the hard cover 562 is detached from the tubular member 330 in a state where the inner needle 321 is located inside the hard cover 562 and the guide wire 322 is located inside the bellows cover 563. To be separated. Therefore, in the indwelling needle 560, the hard needle body 321 can be reliably covered with the hard cover 562, and the flexible guide wire 322 can be covered with the flexible bellows cover 563.

  Also in this example, the hard cover 562 has a length sufficient to cover at least the front end portion of the needle body 321 when the inner needle 320 is pulled out from the outer needle 310 and the tubular member 330. Just do it.

  In the above embodiment, the extension tube 350 of the indwelling needle 300 has a bifurcated structure, and the contrast syringe 200C and the physiological saline syringe 200P are simultaneously attached. However, for example, the end may not be branched and only one of the contrast syringe 200C or the physiological saline syringe 200P may be attached, or the end may be branched into three or more, and three or more kinds of liquid syringes may be provided. You may make it mount | wear. When the end of the extension tube 350 is not branched and the indwelling needle 300 is configured as an indwelling needle for the contrast syringe 200C, the indwelling needle 300 may be preliminarily filled with a contrast medium as a chemical solution. .

  Further, in the above embodiment, the contrast syringe 200C and the physiological saline syringe 200P are detachably attached to the bifurcated ends of the extension tube 350 of the indwelling needle 300. However, for example, the contrast syringe 200C and the physiological saline syringe 200P may be integrally attached to the end of the extension tube 350. On the other hand, in the above embodiment, the extension tube 350 is integrally connected to the tubular member 330 of the indwelling needle 300. However, the separate extension tube 350 may be connected to the tubular member 330. Good.

  Moreover, although the tubular member 330 illustrated having the flexible outer needle support tube 331 and the hard branch tube 332 in the said form, the tubular member may be comprised only with the hard member. Similarly, in the above-described embodiment, the inner needle 320 is illustrated as being formed by the hard needle body 321 and the flexible guide wire 322, but the inner needle may be configured only by the hard needle body.

  Furthermore, in the above embodiment, the inner needle 320 is formed as a hollow needle. However, for example, the inner needle 320 may be a solid needle. Moreover, although the structure which the outer needle 310 and the tube member 331 were only connected was illustrated in the said form, what is called a wing and a grip may be mounted | worn with this connection part, for example.

In the above embodiment, the MRI apparatus 400 is used as the fluoroscopic imaging apparatus, and the chemical injection device 100 injects the MR contrast agent. For example, as the fluoroscopic imaging apparatus, a CT (Computed Tomography) scanner, PET (Positron Emission Tomography) equipment, ultrasonic diagnostic equipment, angio equipment, MRA (MR
The indwelling needle of the present invention can also be applied to the case where the chemical solution injection device injects a contrast agent for the use of an Angio) device.

  Furthermore, although each part, such as the chemical | medical solution injection apparatus 100, was demonstrated concretely by the said form, you may change those structures suitably. For example, the drive source of the piston drive mechanism 117 may be a DC (Direct Current) motor or an AC (Alternating Current) motor, or the display panel 104 may be configured with an organic EL (Electro-Luminescence) display or a plasma display.

  Moreover, in the said form, it illustrated that each means of the chemical | medical solution injection apparatus 100 was logically implement | achieved when CPU141 operate | moves corresponding to the computer program stored in RAM143 etc. FIG. However, each of these means may be configured by unique hardware, or a part of the means may be stored in the RAM 143 or the like as software and a part of the hardware may be configured.

Claims (25)

A drug solution injection tool used to inject a drug solution into a blood vessel,
A flexible outer needle with at least an anterior part placed in the blood vessel;
Before part hard der so that has a rigid needle body and a flexible guide wire, an inner needle front portion is punctured into the blood vessel is located in the outer inner needle,
A tubular member in which a rear end portion of the outer needle is integrally connected to a front end opening and a rear portion of the inner needle protrudes from a rear end opening;
Wherein a rigid cover that covers at least the front end of the needle body, to have a stretchable bellows structure such that the length to accommodate the entire of the inner needle in a stretched state when the inner needle is withdrawn from the tubular member and bellows cover, and have a rear end portion of the inner needle is fixed to the rear end portion, and a cover member front end portion is mounted detachably to the rear end opening of said tubular member,
A chemical injection tool. The cover member is formed to maintain a compressed state and an extended state,
A force required to extend the compressed cover member by pulling the rear end of the cover member is A, and a force required to separate the front end portion of the cover member from the rear end opening of the tubular member. When B
A <B
The chemical injection device according to claim 1, wherein: Said cover member is formed by its own elasticity so as to be compressed or Racing Zhang state,
When C is a force required to extend the cover member in order to pull out the inner needle from the rear end of the outer needle, and D is a force acting on the inner needle by the compressed cover member,
C> D
The chemical injection device according to claim 1, wherein:   4. The cover member according to claim 1, wherein the cover member has an elastic member in the front end opening that seals the front end opening of the cover member by accommodating the inner needle inside the cover member. The drug solution injection tool according to Item.   The cover member is opened in a state where the inner needle is present in the front end opening of the cover member, and is closed by the inner needle being accommodated in the cover member. The medical-solution injecting device according to any one of claims 1 to 4, further comprising:   The said cover member has the manual valve which can be opened and closed by manual operation in which the said inner needle is penetrated in the open state, The front-end opening of the said cover member has any one of Claim 1 thru | or 5 Chemical solution injection tool.   The drug solution injection tool according to any one of claims 1 to 6, further comprising a sealing cap attached to a front end opening of the cover member. Wherein the rigid cover and the bellows cover are connected to each other at respective front ends, any one of from the rear part from the front end of the hard cover claims 1 located inside the bellows cover 7 The drug solution injection tool described in 1. The medical solution injection tool according to any one of claims 1 to 7, wherein the hard cover is slidably mounted inside a front end of the bellows cover. Said tubular member, by the inner needle is withdrawn from said tubular member, said rear end opening of the tubular member an elastic member for elastically sealed, the claims 1 and has a rear end opening 9 The chemical | medical solution injection tool as described in any one of Claims. The tubular member is opened in a state where the inner needle is present in the tubular member, and has a one valve at the rear end opening of the tubular member that is closed when the inner needle is pulled out of the tubular member. claims 1 have to liquid injection tool according to any one of 1 0. Said tubular member, the inner needle in the open state are inserted, the openable and closable manual valve by a manual operation, to any one of the claims 1 and has a rear end opening of the tubular member 1 0 The chemical solution injection tool described. The drug solution injection tool according to any one of claims 1 to 9 , further comprising a sealing cap attached to a rear end opening of the tubular member. An extension tube connected to the tubular member;
Said tubular member, said extension tube is closed when not connected, chemical according to the any one of claims 1 has an automatic valve which is opened by the extension tube is connected 1 3 Injection tool. An extension tube connected to the tubular member;
The tubular member has an injection port to which the extension tube is connected formed separately from the rear end opening, and is closed when the extension tube is not connected, and is opened when the extension tube is connected. liquid injection tool according to any one of 1 3 to the automatic valves claims 1 is mounted in the inlet to be. Liquid injection tool according to any one of the claims 1 drug solution is filled in the interior of the tubular member 1 5. Liquid injection tool according to any one of from 1 5 to claim 1 saline is filled inside of the tubular member. Liquid injection tool according to any one of claims 1 to 1 3 further has an extension tube which is connected to the tubular member. The chemical solution injection tool according to claim 18 , wherein the tubular member and the extension tube are filled with a chemical solution. The medical solution injection tool according to claim 18 , wherein the tubular member and the extension tube are filled with physiological saline. An extension tube having a distal end connected to the tubular member;
A chemical container connected to an end of the extension tube;
Further claims 1 and have a to liquid injection tool according to any one of 1 3. It said tubular member, chemical liquid injection device of claim 2 1 drug solution inside the extension tube and the drug solution container is filled. The extension tube has a bifurcated end, a contrast syringe filled with a contrast agent as the drug solution, and a physiological saline filled with physiological saline, as the drug solution container at each branched end. liquid injection device of claim 2 1, and water syringe is coupled. Which are connected to the extension tube, liquid injection tool according to any one of to more claims 1 8 having a bubble elimination means for eliminating air bubbles from the liquid 2 3. Wherein provided on the tubular member, liquid injection tool according to any one of claims 1 to 2 3 further comprises a bubble removing means for eliminating bubbles from a liquid.

Images