JP2013009919A - Epidural needle puncture system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an epidural needle puncture system in which an epidural needle can be reliably inserted into an epidural space and held therein.SOLUTION: The epidural needle 10 includes: a needle body 11 having a through-hole formed therein; a needle base 12 at which the needle body 11 is fixed; and a holding body 14 removably retained at the needle base 12. The removal of the holding body 14 from the needle base 12 can be decided according to a pressure value detected by a pressure sensor for detecting the puncture pressure of the needle body 11.

Description

  The present invention relates to an epidural needle puncture system used when puncturing an epidural needle into an epidural space.

  There are spinal anesthesia and epidural anesthesia as local anesthesia methods mainly performed during surgery on the lower abdomen and lower limbs. Spinal anesthesia is anesthesia in which a local anesthetic is administered into the subarachnoid space, and is easy to perform by hand, but has weaknesses such as limited anesthesia sites and inability to continuously administer. Epidural anesthesia is an anesthesia in which a local anesthetic is administered to the epidural space, and has an advantage that it can be used for cervical and thoracic surgery and can be anesthetized with an indwelling catheter for a long time. However, epidural anesthesia has the disadvantage that it is difficult to perform manually.

  Epidural anesthesia punctures the epidural space with an epidural needle, but the needle tip must pass through the ligamentum flavum before reaching the epidural space. The yellow ligament has a strong structure to support the upper body by connecting the vertebrae up and down, and has a very high puncture resistance when the needle tip is pushed forward. On the other hand, the epidural space is mainly composed of adipose tissue and has low puncture resistance. Therefore, until the needle tip has passed through the yellow ligament, the needle will not advance deeply unless it is pressed with a strong force. However, the puncture resistance rapidly decreases as soon as the needle tip reaches the epidural space. In addition, the needle tip is unintentionally advanced.

  The epidural space is only about 3 mm thick, and if it is not carefully punctured, the needle tip may penetrate the dura mater and reach the subarachnoid space. The amount of anesthetic needed for epidural anesthesia is about 10 times that of spinal anesthesia, so if an anesthetic is injected for epidural anesthesia with the tip of the needle reaching the subarachnoid space, it will be overdosed. It is a danger. Furthermore, if the needle tip does not stop in the subarachnoid space and punctures the spinal cord, the spinal nerve is cut, which may lead to a medical accident of inferior lower body.

  Therefore, conventionally, it has been confirmed that the tip of the needle has reached the epidural space using a resistance disappearance method or the like. In the resistance disappearance method, when the needle tip reaches the vicinity of the epidural space, a syringe filled with physiological saline or air is attached to the back end of the needle, and the movable piston of the syringe is pressed with a finger to apply pressure to the syringe. While pushing the needle, the resistance of the movable piston suddenly decreases as soon as the needle tip reaches the epidural space, and physiological saline and air smoothly flow into the epidural space, reaching the epidural space. It is a method to confirm that.

  However, since the resistance disappearance method is a method of sensing the moment when the needle tip reaches the epidural space with the sense of the fingertip, there is a problem that it requires skill of the practitioner (anesthesiologist).

  Therefore, Patent Documents 1 and 2 disclose that the resistance disappearance method is electromechanically detected to detect a change in pressure in the syringe visually and / or acoustically. In the apparatus disclosed in Patent Document 1, the transition of the pressure in the needle tube is displayed as a graph on the screen, and at the same time, sound having a frequency proportional to the pressure is output from the speaker. In the apparatus disclosed in Patent Document 2, the color that appears on the pressure display pin changes according to the injection pressure. In this way, it is possible to detect the moment when the tip of the epidural needle reaches the epidural space regardless of whether the practitioner is skilled or not.

JP-T-2004-530493 JP 2005-527334 A

  However, even if the practitioner can detect the moment when the tip of the epidural needle reaches the epidural space by the device disclosed in Patent Document 1 or 2, the epidural needle is stopped from that moment. It takes a certain amount of time to make it happen. Specifically, after the practitioner senses the moment when the needle tip reaches the epidural space, a signal is transmitted to the limbic system through sensory nerves, and information is transmitted. It takes about 0.2 seconds for the command signal to be sent via the motor nerve and the muscle to finish the reaction. This response time of 0.2 seconds is a sufficient time for the needle tip to penetrate the epidural space.

  Therefore, if the device disclosed in Patent Document 1 or 2 is used, it is easy to sense that the tip of the needle has reached the epidural space, but the practitioner himself can use an appropriate epidural needle. Need to stop in position. In other words, when the moment when the tip of the needle reaches the epidural space is sensed, it is already too late to start the needle entry, and there is a risk of excessive puncture by simply relying on human reflexes. Therefore, the problem that the skill of the practitioner is still required remains.

  The present invention has been made in view of such a background, and an object of the present invention is to provide an epidural needle puncture system that can securely puncture an epidural needle into an epidural space.

  The present invention relates to an epidural needle puncturing system used when puncturing an epidural needle into an epidural space, a needle body in which a through hole is formed, a needle base to which the needle body is fixed, And an epidural needle having a gripping body that is releasably held by the needle base, a pressure sensor that detects the puncture pressure of the needle body, and the needle base according to the pressure value detected by the pressure sensor. And a control device that allows the gripper to be detached.

  According to the present invention, the gripper can be detached from the needle base according to the pressure value detected by the pressure sensor that detects the puncture pressure of the needle body. When the practitioner grasps the grasping body and pushes the epidural needle toward the epidural space from the inside of the yellow ligament toward the epidural space, the puncture pressure suddenly increases when the needle point reaches the epidural space. To drop. Therefore, it is possible to detect the moment when the needle tip reaches the epidural space by detecting a rapid decrease in the puncture pressure according to the pressure value detected by the pressure sensor. At that moment, the control device enables the gripping body to be detached from the needle base, and the needle base is prevented from further entering with the gripping body pushed by the practitioner.

  Compared to the case where the approach of the needle tip is stopped by a human reflex nerve, the response time from the moment when the needle tip reaches the epidural space is extremely high, so that the gripper can be detached from the needle base systematically. Since the length is shortened, the needle tip can be securely punctured into the epidural space.

  Further, in the present invention, one of the needle base or the gripping body is provided with an electromagnet, and at least a part of the other is made of a ferromagnetic body, and the control device sends current to the coil of the electromagnet, When the pressure value detected by the pressure sensor decreases by a predetermined pressure value or more or a predetermined ratio or more from the maximum detected pressure value, the current flowing in the coil of the electromagnet is cut off, and the needle base is It is preferable that the gripping body can be detached from.

  In this case, as long as the pressure value detected by the pressure sensor does not decrease from the maximum detected pressure value by a predetermined pressure value or more or a predetermined ratio or more, the gripping body is adsorbed and held on the needle base. Therefore, as the practitioner pushes the grasping body forward, the needle body fixed to the needle base advances to the back, and the puncture operation can be performed in the same manner as a normal epidural needle.

  When the pressure value detected by the pressure sensor decreases by a predetermined pressure value or more or a predetermined ratio or more from the maximum detected pressure value, the gripper can be detached from the needle base. Therefore, the grasping body can be detached from the needle base at the moment when the needle tip of the needle body passes through the yellow ligament and reaches the epidural space.

  Further, since the gripper can be detached from the needle base by cutting off the current flowing in the electromagnet coil provided in the needle base, the transmission path from the pressure sensor to the electromagnet can be electrically configured. The gripper can be detached by the disappearance of the magnetic force generated by the electromagnet. Therefore, the response time from the moment when the needle tip reaches the epidural space until the gripper can be detached is very short.

  Also, in the present invention, one of the needle base or the gripping body includes an electromagnet, at least a part thereof is formed of a permanent magnet, and at least a part of the other is formed of a ferromagnetic body, and the control device includes the electromagnet When the pressure value detected by the pressure sensor decreases by a predetermined pressure value or more or a predetermined ratio or more from the maximum detected pressure value, the permanent current is blocked. It is preferable to allow a current to flow through the coil of the electromagnet so that the needle base can be detached from the gripping body so that the electromagnet generates a magnetic force that counteracts the magnetic force generated by the magnet.

  Further, in the present invention, one of the needle base or the gripping body is provided with an electromagnet, and at least a part of the other is formed of a permanent magnet, and the control device interrupts a current flowing through the coil of the electromagnet, The electromagnet generates a magnetic force that counteracts the magnetic force of the permanent magnet when the gripping body is adsorbed and held on a needle base, and the pressure value detected by the pressure sensor is decreased from the maximum detected pressure value by a predetermined pressure value or a predetermined ratio or more. As described above, it is preferable that an electric current is passed through the coil of the electromagnet so that the needle base can be detached from the gripping body.

  In these cases, as long as the pressure value detected by the pressure sensor does not decrease from the maximum detected pressure value by a predetermined pressure value or more or a predetermined ratio or more, the gripping body is adsorbed and held by the needle base. Therefore, as the practitioner pushes the grasping body forward, the needle body fixed to the needle base advances to the back, and the puncture operation can be performed in the same manner as a normal epidural needle.

  When the pressure value detected by the pressure sensor decreases by a predetermined pressure value or more or a predetermined ratio or more from the maximum detected pressure value, the gripper can be detached from the needle base. Therefore, the grasping body can be detached from the needle base at the moment when the needle tip of the needle body passes through the yellow ligament and reaches the epidural space.

  Furthermore, since the gripping body can be detached from the needle base by passing a current through the coil of the electromagnet so that the electromagnet generates a magnetic force that cancels the magnetic force generated by the permanent magnet, the transmission path from the pressure sensor to the electromagnet is electrically connected. The gripper can be detached from the needle base by the generation of magnetic force generated by the electromagnet. Therefore, the response time from the moment when the needle tip reaches the epidural space until the gripper can be detached is very short.

  In the present invention, it is preferable that the pressure sensor detects a puncture pressure of the needle body by detecting a pressure of a fluid filled in a tube communicating with a through hole of the needle body.

  In this case, when the needle tip of the needle body is in the yellow ligament, the fluid does not flow into the yellow ligament, so the pressure of the fluid in the tube increases, but the needle tip passes through the yellow ligament and passes through the epidural space. The moment the fluid reaches the fluid, the fluid flows into the epidural space, and the pressure of the fluid in the tube rapidly decreases. Therefore, the moment when the needle tip reaches the epidural space can be reliably detected by detecting the pressure of the fluid in the tube with the pressure sensor. Furthermore, since the pressure sensor can be installed at an arbitrary position on the tube to detect the puncture pressure of the needle body, the degree of freedom of the system is excellent.

1 is an overall configuration diagram showing an epidural needle puncture system according to an embodiment of the present invention. The fragmentary sectional view which shows an epidural needle. The fragmentary sectional view which shows the epidural needle of the state which the holding | grip part removed. The block diagram of a control apparatus. The fragmentary sectional view which shows the epidural needle in the epidural needle puncture system which concerns on another embodiment of this invention. The fragmentary sectional view which shows the epidural needle of the state which the holding | grip part removed.

  Hereinafter, epidural needle puncture system 100 according to an embodiment of the present invention will be described with reference to the drawings.

  Referring to FIG. 1, epidural needle puncture system 100 includes epidural needle 10, injection device 20, pressure detection device 30, tube 40, and control device 50. Further, epidural needle puncture system 100 also includes a stylet 60.

  2 and 3, the epidural needle 10 includes a needle body 11, a needle base 12, an electromagnet 13, and a gripping body 14. The epidural needle 10 is configured such that the stylet 60 can be inserted. The epidural needle 10 is configured to be vertically symmetrical. In FIGS. 2 and 3, a cross-sectional view is shown above the center line, and an external view is shown below.

  The needle body 11 is formed with a through hole (hollow channel). Here, the needle body 11 is formed of a hollow stainless steel pipe, and in order to reduce the possibility that the needle tip will penetrate the epidural space, the tip portion is rounded and the blade tip is a blunt needle. .

  The needle base 12 has a rear end portion of the needle body 11 bonded and fixed to a front end portion thereof. Further, a luer female connector is provided at the rear end of the needle base 12 for connecting the tube 40.

  The electromagnet 13 is installed on the needle base 12. The electromagnet 13 includes an excitation coil 15 and an excitation yoke 16 arranged so as to surround the excitation coil 15.

  The exciting coil 15 is configured by winding a winding wire such as a general enamel wire or polyurethane wire as a coil material. Using a cement wire in which the outer sheath of these winding wires is coated with a heat-reactive curable adhesive, the winding operation of the exciting coil 15 and the assembly and fixing operation by heat curing can be performed substantially simultaneously, which is preferable. .

  The exciting yoke 16 is formed in a box shape from a ferromagnetic material so that the generated magnetic force lines are confined and the gripping body 14 can be reliably attracted and held. The excitation yoke 16 is preferably formed of a stainless steel material that is resistant to rust and corrosion in consideration of repeated use with the gripping body 14.

  Since an austenitic stainless steel such as 18-8 stainless steel, which is a common medical device material, does not have ferromagnetism, it is preferable to form the excitation yoke 16 from martensitic stainless steel such as SUS430. Further, the excitation yoke 16 may be formed from a sintered ceramic material such as ferrite, which is an excellent ferromagnetic material that lacks mechanical toughness.

  The excitation yoke 16 is fixed to the needle base 12. Here, the exciting yoke 16 is fixed to the needle base 12 by screwing and fitting a claw formed in the intermediate portion of the outer diameter of the needle base 12 into a recess formed in the exciting yoke 16.

  In order to flow a current for exciting the electromagnet 13, the exciting coil 16 is connected to the control device 50 via an electric cable 17 (see FIGS. 1 and 4).

  The gripping body 14 is a portion that is gripped by a practitioner (anesthesiologist) with a finger, and is formed in a wing shape here. The gripping body 14 is made of a ferromagnetic material such as steel, and is attracted and held at a predetermined position of the needle base 12 by the magnetic force generated by the electromagnet 13. Here, the gripping body 14 includes a hollow portion 18 and is configured to be held by a gripping body holding portion 19 of the needle base 12 formed according to the shape of the hollow portion 18.

  While the electromagnet 13 is generating a magnetic force, the gripping body 14 is attracted and held by the needle base 12, but when the magnetic force disappears, the gripping body 14 is configured to be easily removable from the needle base 12. .

  Referring to FIG. 1, injection device 20 is a fluid supply means for supplying a fluid to a through hole formed in needle body 11 of epidural needle 10 through tube 40, and a fluid in the through hole. It is also a pressure applying means for applying a pressure to. The injection device 20 may be a mechanical pump such as a syringe pump or an infusion pump, but is a syringe here. The syringe 20 includes a cylinder body (syringe) 21, a fluid storage space 22, and a movable piston (plunger, pusher) 23.

  The pressure detection device 30 is a device that detects resistance (puncture pressure) applied to the tip of the epidural needle 10 with a pressure sensor, and is a pressure sensor here. Here, the pressure sensor 30 is installed in the tube 40 to detect the fluid pressure in the tube 40. The pressure sensor 30 may be installed at an arbitrary position of the tube 40, for example, at the end of the tube 40.

  The pressure sensor 30 detects pressure by any known pressure detection method. As the pressure sensor 30, for example, a form in which pressure is detected from a balloon inflated by pressure can be used. The pressure sensor 30 sends a pressure signal obtained by converting information corresponding to the detected pressure value into an electrical signal to the control device 50.

  The tube 40 is a passage for supplying fluid from the syringe 20 to the epidural needle 10 and is also a pressure transmission means for transmitting the puncture pressure of the epidural needle 10. The tube 40 is connected between the rear end of the needle base 12 and the tip of the syringe 20. The tube 40 is a soft tube formed from, for example, polyethylene or polyvinyl chloride. A check valve is built in the rear end of the tube 40 to prevent pressure escape.

  The control device 50 allows the gripping body 14 to be detached from the needle base 12 according to the pressure value detected by the pressure detection device 30.

  Referring to FIG. 4, the control device 50 includes an amplifier 51, a peak hold circuit 52, a pressure dip detection circuit 53, a flip-flop (F / F) 54, a switch 55, a power supply 56, and an amplifier 57.

  The pressure signal sent from the pressure sensor 30 is input to the control device 50. The pressure signal input to the control device 50 is amplified by the amplifier 51 and input to the peak hold circuit 52 and the pressure dip detection circuit 53.

  The peak hold circuit 52 is a circuit that stores and holds the maximum value of the signal, holds a pressure signal corresponding to the maximum pressure value from the start of pressure detection to the present time, and outputs the pressure signal to the pressure dip detection circuit 53. .

  The pressure dip detection circuit 53 includes two pressure signals (a signal corresponding to the current pressure value) input from the amplifier 51 and a pressure signal (a signal corresponding to the maximum pressure value) input from the peak hold circuit 52. When the input signal (pressure signal) is compared and the current pressure value has not decreased below a predetermined reference value with respect to the maximum pressure value, a set signal is sent to the flip-flop 54. At this time, the flip-flop 54 is in a holding state when the switch 55 is on, and a current flows from the power source 56 to the exciting coil 15 via the amplifier 57. Therefore, the gripping body 14 is attracted and held on the needle base 12.

  On the other hand, the pressure dip detection circuit 53 does not send a set signal to the flip-flop 54 when the current pressure value falls below a predetermined reference value with respect to the maximum pressure value. At this time, even if the flip-flop 54 is reset and the switch 55 is turned on, no current flows from the power source 56 to the exciting coil 15, and the magnetic force is instantaneously lost. Accordingly, the gripping body 14 is not attracted and held by the needle base 12, and the gripping body 14 can be easily detached from the needle base 12.

  Hereinafter, an epidural anesthesia method using the epidural needle puncture system 100 will be described.

  First, the practitioner punctures the epidural needle 10 with the stylet 60 inserted until the needle tip of the needle body 11 reaches the yellow ligament by the median method or paramedian puncture method. At this time, a current is supplied from the control device 50 to the excitation coil 15 of the epidural needle 10, and the gripping body 14 is held by suction on the needle base 12.

  Next, after removing the stylet 60 from the epidural needle 10, the tube 40 is connected between the needle base 12 of the epidural needle 10 and the tip of the syringe 20, and the pressure sensor 30 is installed in the middle of the tube 40. To do. Then, physiological saline is supplied from the syringe 20, and the through hole and the tube 40 formed in the needle body 11 of the epidural needle 10 are filled with physiological saline. In place of the physiological saline, a fluid such as another liquid or a gas such as air may be filled.

  Next, the operator holds the gripping body 14 with the thumb and index finger while pushing the movable piston 23 of the syringe 20 with the other thumb while keeping the current supplied from the control device 50 to the excitation coil 15. The epidural needle 10 is further pushed straight forward at a constant speed. A syringe pump may be used to automatically press the movable piston 23. Moreover, you may apply pressure to the physiological saline in the tube 40 using an infusion pump.

  When the needle tip of the epidural needle 10 is in the yellow ligament, since the yellow ligament is a strong tissue, the puncture pressure is large, and the physiological saline pressure in the tube 40 detected by the pressure sensor 30 is also large. The maximum pressure value detected by the pressure sensor 30 does not drop below the predetermined reference value. For this reason, the gripping body 14 is maintained in the state of being adsorbed and fixed to the needle base 12, and the needle tip of the needle body 11 fixed to the needle base 12 is pushed forward as the gripping body 14 is pushed.

  Then, at the moment when the needle tip of the epidural needle 10 passes through the yellow ligament and protrudes into the epidural space, physiological saline flows from the needle tip into the epidural space and is detected by the pressure sensor 30. The pressure value rapidly decreases below the predetermined reference value with respect to the maximum pressure value. Therefore, the supply of current from the control device 50 to the exciting coil 15 is momentarily interrupted, the magnetic force generated by the electromagnet 13 disappears, and the gripping body 14 can be detached from the needle base 12.

  From the moment when it is detected that the needle tip has reached the epidural space until the force for pushing the needle body 11 is electromagnetically released, the transmission path from the pressure sensor 30 to the exciting coil 15 is electronic. Since it is a circuit, the estimated time is about 5/1000 seconds or less, which is extremely short compared to the response time by human reflexes. Then, the amount that the needle tip advances deeply within this response period is very short, at most about 0.3 mm, and then the grasping body 14 is detached from the needle base 12, so that the practitioner continues to push the grasping body 14 in. However, the needle body 11 fixed to the needle base 12 does not enter any more, and the needle tip stays securely in the epidural space.

  The pressure value detected by the pressure sensor varies depending on conditions such as the patient, the puncture site, the type, length, diameter, composition of the infusion fluid, viscosity, and puncture speed of the needle body 11. However, when the needle tip is in the ligamentum flavum and in the epidural space, the pressure value detected by the pressure sensor 30 is greatly different. By setting an appropriate reference value, regardless of the above conditions, The moment when the needle tip reaches the epidural space can be reliably detected.

  It should be noted that when the pressure value detected by the pressure sensor 30 suddenly drops below a predetermined reference ratio with respect to the maximum pressure value, the supply of current from the control device 50 to the exciting coil 15 is instantaneously cut off. You may comprise.

  Thereafter, an epidural catheter (not shown) is inserted into the epidural needle 10 and a local anesthetic is injected from the syringe 20. Note that after the needle tip of the epidural needle 10 is retained in the epidural space, a treatment such as local anesthesia may be performed by any known method.

  In this way, by using the epidural needle puncture system 100, the penetration of the needle tip is electromagnetically stopped at the moment when the needle tip of the epidural needle 10 reaches the epidural space. Therefore, it is possible to reliably perform safe epidural anesthesia without depending on the skill of the patient.

  Hereinafter, an epidural needle puncture system according to another embodiment of the present invention will be described. Since the epidural needle puncture system is similar to the epidural needle puncture system 100 according to the embodiment, only different points will be described.

  In the present embodiment, the excitation yoke 16 is formed using a permanent magnet. Therefore, the gripping body 14 can be attracted and held on the needle base 12 without supplying current to the exciting coil 15 from the control device 10. Therefore, it is not necessary to supply current to the excitation coil 15 in order to attract and hold the gripping body 14 on the needle base 12 for a long time until the needle tip reaches the epidural space. There is no need to take measures against heat generation.

  When the gripping body 14 is made detachable from the needle base 12, a current is passed from the control device 50 to the exciting coil 15 in a direction in which the magnetic force generated by the electromagnet 13 cancels the magnetic force of the permanent magnet, so that the magnetic force is substantially left. It should just be set as the state which does not.

  By the way, although it is not necessary to take measures against heat generation by using a permanent magnet, it is necessary to individually adjust the reverse excitation current corresponding to the magnetic force of the permanent magnet. Therefore, it is preferable that an appropriate reverse excitation current can be automatically output from the control device 50. For example, if a magnetic sensor such as a Hall element or a magnetoresistive element is installed on the magnetic pole end face of a permanent magnet, the reverse excitation current is increased, and the increase is stopped at a current value at which the magnetic force detected by the magnetic sensor becomes substantially zero. Good. Thereby, it is possible to easily realize reverse excitation with no adjustment and substantially zero magnetic force.

  Instead of forming the excitation yoke 16 using a permanent magnet, the gripping body 14 and other portions of the needle base 12 may be formed using a permanent magnet. Further, both the excitation yoke 16 and the gripping body 14 may be formed using a permanent magnet.

  Hereinafter, an epidural needle puncture system according to still another embodiment of the present invention will be described with reference to the drawings.

  This epidural needle puncture system is different from the epidural needle puncture system 100 described above only in that an epidural needle 70 is provided instead of the epidural needle 10.

  With reference to FIGS. 5 and 6, the epidural needle 70 includes a needle body 71, a needle base 72, an electromagnet 73, and a gripping body 74. The epidural needle 70 is configured to be vertically symmetrical. In FIGS. 5 and 6, a cross-sectional view is shown above the center line, and an external view is shown below.

  The needle body 71 is formed with a through-hole in the same manner as the needle body 11 described above.

  The needle base 72 is configured in the same manner as the needle base 12 described above, and the rear end portion of the needle body 71 is bonded and fixed to the front end portion thereof. The electromagnet 73 is installed on the grip body 74. The electromagnet 73 includes an excitation coil 75 and an excitation yoke 76 disposed so as to surround the excitation coil 75. The exciting coil 75 and the exciting yoke 76 are configured similarly to the exciting coil 15 and the exciting yoke 16 described above, respectively.

  The excitation yoke 76 is fixed to the gripping body 74. Here, the exciting yoke 76 is fixed to the gripping body 74 by screwing and fitting a claw formed in the intermediate portion of the outer diameter of the gripping body 74 into a recess formed in the exciting yoke 76.

  The grip body 74 is configured in the same manner as the grip body 14 described above, but is not necessarily formed from a ferromagnetic material. The grip body 74 is attracted and held at a predetermined position of the needle base 72 by the magnetic force generated by the electromagnet 73. Here, a substantially disc-shaped adherend 77 formed of a ferromagnetic material such as steel is caulked and fixed to the needle base 72, and the gripping body 74 can come into contact with the adherend 77. .

  While the electromagnet 73 generates a magnetic force, the gripping body 74 is attracted and held by the needle base 72 in contact with the adherend 77, but when the magnetic force disappears, the gripping body 74 is separated from the adherend 77. Is released from the needle base 72 and can be easily detached from the needle base 72. Note that it is sufficient that at least a part of the needle base 72 is made of a ferromagnetic material, and the structure without the adherend 77 may be used.

  By using the epidural needle puncture system including the epidural needle 70 configured as described above, the tip of the epidural needle 70 can be used as the dura mater as in the epidural needle puncture system 100 described above. Since the penetration of the needle tip is electromagnetically stopped at the moment of reaching the outer space, it is possible to reliably perform safe epidural anesthesia without depending on the skill of the practitioner.

  Moreover, you may form the excitation yoke 76 of the epidural needle 70 using a permanent magnet similarly to the epidural needle puncture system which concerns on another embodiment of this invention mentioned above. Furthermore, the gripping body 74 and other portions of the needle base 72 may be formed using a permanent magnet, or both the excitation yoke 76 and the gripping body 74 may be formed using a permanent magnet.

  The epidural needle puncture system according to the embodiment of the present invention has been described above, but the epidural needle puncture system according to the present invention is not limited to the described embodiment, and various modifications can be made as appropriate.

  DESCRIPTION OF SYMBOLS 10,70 ... Epidural needle, 11,71 ... Needle main body, 12,72 ... Needle base, 13,73 ... Electromagnet, 14,74 ... Grasping body, 15,75 ... Excitation coil, 16,76 ... Excitation yoke, DESCRIPTION OF SYMBOLS 20 ... Injection apparatus, syringe, 30 ... Pressure detection apparatus, pressure sensor, 40 ... Tube, 50 ... Control apparatus, 100 ... Epidural space puncture system

Claims (5)

An epidural needle puncture system for use in puncturing an epidural needle into an epidural space,
An epidural needle having a needle body in which a through-hole is formed, a needle base to which the needle body is fixed, and a gripping body that is detachably held by the needle base;
A pressure sensor for detecting the puncture pressure of the needle body;
An epidural needle puncture system comprising: a control device that allows the gripper to be detached from the needle base in accordance with a pressure value detected by the pressure sensor. One of the needle base or the gripping body is provided with an electromagnet, and at least a part of the other is made of a ferromagnetic material,
The control device applies an electric current to the coil of the electromagnet to attract and hold the gripping body on the needle base, and a pressure value detected by the pressure sensor is decreased from a maximum detected pressure value by a predetermined pressure value or a predetermined ratio or more. 2. The epidural needle puncture system according to claim 1, wherein the current flowing in the coil of the electromagnet is interrupted, and the gripper can be detached from the needle base. One of the needle base or the gripper is provided with an electromagnet and at least a part is formed of a permanent magnet, and at least a part of the other is made of a ferromagnetic material,
The control device cuts off a current flowing through the coil of the electromagnet, causes the needle base to be sucked and held by the needle base, and a pressure value detected by the pressure sensor is greater than or equal to a predetermined pressure value or a predetermined ratio from a maximum detected pressure value The current is passed through the coil of the electromagnet so that the electromagnet generates a magnetic force that counteracts the magnetic force generated by the permanent magnet when the magnetic force is reduced, and the gripper can be detached from the needle base. The epidural needle puncture system according to 1. One of the needle base or the gripping body includes an electromagnet, and at least a part of the other is formed from a permanent magnet,
The control device cuts off a current flowing through the coil of the electromagnet, causes the needle base to be sucked and held by the needle base, and a pressure value detected by the pressure sensor is greater than or equal to a predetermined pressure value or a predetermined ratio from a maximum detected pressure value The current is passed through the coil of the electromagnet so that the electromagnet generates a magnetic force that counteracts the magnetic force generated by the permanent magnet when the magnetic force is reduced, and the gripper can be detached from the needle base. The epidural needle puncture system according to 1.   5. The pressure sensor according to claim 1, wherein the pressure sensor detects a puncture pressure of the needle body by detecting a pressure of a fluid filled in a tube communicating with the through hole of the needle body. The epidural needle puncture system according to item 1.

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