A nerve block device that can be operated with one hand

Abstract

The present invention, "a nerve block device and method that can be operated with one hand", belongs to the field of medical devices. The nerve block device that can be operated with one hand includes a positive pressure syringe for storing nerve block liquid, a liquid chamber for controlling injection and a negative pressure chamber for suction; the positive pressure syringe provides positive pressure to push the liquid inside it outward, and its injection head is connected to the liquid inlet of the liquid chamber through a connecting tube. The device and method of the present invention can complete the suction and injection actions that require the cooperation of two people in traditional nerve block operations by pressing the thumb of one hand, which greatly liberates manpower, simplifies the operation steps, saves operation time, and improves operation efficiency. It has broad and good clinical application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a nerve blocking device that can be operated with one hand. Background Art

[0002] Nerve block anesthesia: refers to the injection of local anesthetics into the nerve trunks, plexuses or ganglia of the trunk or limbs, temporarily blocking the conduction function of the nerve, so that the area it controls produces anesthesia. Local nerve block has little effect on the patient's respiration, circulation, central nervous system, etc., and is widely used in clinical anesthesia, especially for patients with more serious cardiovascular and cerebrovascular diseases and respiratory diseases who need surgical operations. It can also meet the patient's analgesic needs. It is a commonly used analgesic method in pain departments and also provides a guarantee for the rapid recovery of patients after surgery.

[0003] Ultrasound-guided nerve block technology: Ultrasound, as the third eye of anesthesiologists, has little impact on patients' health, can provide accurate anatomical positioning, ensure the perfection of nerve block effect, and reduce the chance of related complications.

[0004] Currently, ultrasound-guided nerve block technology is commonly used in clinical practice. The operator holds the ultrasound probe in one hand and the nerve block needle in the other. As the ultrasound image shows the block needle approaching the nerve to be blocked, the assistant is responsible for aspirating blood (to determine whether it has entered the blood vessel by mistake) and then injecting local anesthetics.

[0005] Nerve block needles are commonly used in clinical practice. Nerve block needles (different lengths) are connected to injection extension tubes and conductive wires, which are connected to syringes and nerve stimulators respectively. (Ultrasound-guided technology can be used without nerve stimulation)

[0006] The currently commonly used implementation method requires two people to cooperate in the operation, which wastes manpower. At the same time, the operator and the assistant may have differences in issues such as the timing and amount of injection, resulting in poor cooperation, prolonged operation time, and affected blocking effects. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a nerve block device that can be used under ultrasound guidance and can be operated with one hand, so as to enable a single person to complete the nerve block technology under ultrasound guidance.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A nerve block device operable with one hand, characterized in that the device comprises a positive pressure syringe for storing nerve block liquid medicine, a liquid chamber for controlling injection of medicine and a negative pressure chamber for suction;

[0010] The negative pressure chamber is a hollow cavity structure, and a connection port A that can be connected to the blocking needle is provided on the side wall of the cavity, or a connection port A that can be connected to the blocking needle and a liquid medicine inlet for liquid medicine to enter are provided on the side wall of the cavity; the positions of the connection port A and the liquid medicine inlet do not conflict;

[0011] A piston is arranged inside the negative pressure chamber; the piston comprises a piston body and a piston rod, the piston rod extends out of the nerve blocking device by extending out of the top of the negative pressure chamber; the piston rod is a hollow cylinder, and a through hole A is provided on the top of the hollow cylinder, and a through hole B is provided on the bottom side wall of the hollow cylinder; a liquid medicine channel is transversely provided on the piston body for liquid medicine to pass through; the inlet of the liquid medicine channel can be connected to the liquid medicine inlet and be airtightly connected; the outlet of the liquid medicine channel can be connected to the connection port A and be airtightly connected;

[0012] The liquid medicine cavity is a hollow cavity structure, and a connection port B and a liquid medicine inlet for liquid medicine to enter the liquid medicine cavity are provided on the side wall of the cavity; the connection port B does not conflict with the position of the liquid medicine inlet; a piston is provided inside the liquid medicine cavity, and the piston in the liquid medicine cavity can close or open the liquid medicine inlet and the connection port B by moving up and down; the piston includes a piston body and a piston rod, and a liquid medicine channel for liquid medicine to pass through is provided in the piston body in a transverse direction; the inlet of the liquid medicine channel can be connected to the liquid medicine inlet and be tightly connected; the outlet of the liquid medicine channel can be connected to the connection port B and be tightly connected;

[0013] The positive pressure syringe provides positive pressure to push the internal medicine liquid outward, and the injection head is connected with the medicine liquid inlet of the medicine liquid cavity through a connecting tube.

[0014] The negative pressure chamber and the liquid medicine chamber are an integrated structure;

[0015] The liquid medicine chamber is arranged at the lower part of the negative pressure chamber; the piston of the liquid medicine chamber is the same as the piston of the negative pressure chamber; the cavity from the top of the piston body to the inner wall of the top of the device is the negative pressure chamber; the cavity from the bottom of the piston body to the inside of the bottom of the device is the liquid medicine chamber;

[0016] The side wall of the negative pressure chamber is provided with only a connection port A which can be connected to the blocking needle;

[0017] The liquid medicine inlet and the connection port B of the liquid medicine chamber are respectively arranged at two opposite positions on the side wall of the liquid medicine chamber and the heights of the two are consistent;

[0018] Preferably, the distance from the through hole A of the negative pressure chamber to the top of the piston body is a, the distance from the top to the bottom of the inner wall of the device is b, the height of the piston body of the piston is c, the distance from the negative pressure chamber connection port A to the medicine liquid chamber connection port B is d, the distance from the bottom of the medicine liquid channel of the piston body to the bottom of the piston body is e, the distance from the top of the medicine liquid channel of the piston body to the top of the piston body is j, the caliber of the connection port A is i, the caliber of the connection port B is f, the caliber of the medicine liquid inlet is g, the diameter of the medicine liquid channel is h, and the distance from the blocking position to the bottom of the inner wall of the device is k, where a≥b–c=e, c≥d, e>f=g=h=k, j>i.

[0019] The bottom of the nerve blocking device is provided with a bottom opening;

[0020] The connection port A of the negative pressure chamber and the connection port B of the liquid medicine chamber are located on the same side, and the needle tail of the blocking needle is a double-channel tube structure that can be connected to the connection ports A and B respectively;

[0021] Preferably, the two-way pipe structure is made of hard material.

[0022] The negative pressure chamber and the liquid medicine chamber are separate structures;

[0023] The liquid medicine chamber and the negative pressure chamber are respectively arranged at different positions on the passage through which the liquid medicine flows, and the liquid medicine chamber is arranged upstream of the negative pressure chamber;

[0024] A connection port A that can be communicated with the blocking needle and a liquid medicine inlet for liquid medicine to enter are provided on the side wall of the negative pressure chamber;

[0025] The liquid medicine inlet of the negative pressure chamber can be connected to the connection port B of the liquid medicine chamber through a connecting pipe;

[0026] An opening is provided at the bottom of the negative pressure chamber to communicate with the atmosphere;

[0027] An opening is arranged at the bottom of the medicine liquid chamber to communicate with the atmosphere.

[0028] The part of the piston rod of the liquid medicine chamber located in the chamber and close to the piston body is sleeved with a spring;

[0029] More preferably, the height of the spring in a natural state is a, the distance from the top to the bottom of the inner wall of the device is b, the height of the piston body is c, the distance from the bottom of the liquid medicine channel of the piston body to the bottom of the piston body is d, the height from the lowest point of the liquid medicine inlet to the top of the inner wall of the liquid medicine chamber is f, and the height from the highest point of the liquid medicine inlet to the top of the inner wall of the liquid medicine chamber is e, wherein a+c>f, e>a+cd, bf=d;

[0030] Preferably, the bottoms of the drug liquid chamber and the negative pressure chamber are both provided with bottom openings, and the top of the drug liquid chamber is provided with a top opening.

[0031] In the positive pressure syringe, an elastic one-way valve capable of closing the injection port is provided at one end of the syringe barrel near the injection port of the syringe;

[0032] Preferably, the elastic one-way flap 12 includes two arc-shaped spring pieces 121; the bottom periphery of the arc-shaped spring piece is adapted to the inner wall periphery of the syringe near the injection port and is fixedly connected to the inner wall of the syringe, and the side edges and top edges of the two arc-shaped spring pieces are adapted to and fit each other;

[0033] Preferably, the elastic one-way valve 12 is a hollow cylindrical / conical / truncated cone shaped structure with an open bottom, the open circular circumference of the bottom surface is adapted to the inner wall circumference of the syringe near the injection port end and is fixedly connected to the inner wall of the syringe, and a slit opening is provided at the top of the hollow cylindrical / conical / truncated cone shaped structure, and the slit opening allows one end of the connecting tube to pass through.

[0034] A nerve block method operable by one person, characterized by using the nerve block device operable by one hand and combining it with ultrasound-guided operation.

[0035] One hand operates the ultrasound instrument to locate the nerve, and the other hand uses the one-hand-operable nerve block device to perform aspiration and injection.

[0036] The operation of the negative pressure chamber and the liquid medicine chamber of the integrated structure includes the following steps:

[0037] (1) Pull up the piston rod until the piston reaches the top and insert the blocking needle around the nerve located by ultrasound;

[0038] (2) Block the through hole A at the top of the piston rod with your finger and press the piston rod downward to perform negative pressure suction;

[0039] (3) If there is no blood return, loosen through hole A;

[0040] (4) Press the piston rod downward to open the drug channel and inject the drug;

[0041] Preferably, the steps further include: (5) if there is blood return, loosen the through hole A, pull the piston rod to the top, and the generated positive pressure discharges the blood sucked into the negative pressure chamber through the through hole A at the top of the hollow cylinder of the piston rod;

[0042] (6) Use the ultrasound probe to reposition the nerve and repeat steps (1)-(4);

[0043] More preferably, pressing the piston rod downward during the negative pressure suction means pressing the piston rod downward so that the piston body does not exceed the limit block.

[0044] The operation of the negative pressure chamber and the liquid medicine chamber of the split structure includes the following steps:

[0045] (1) Pull up the hollow piston rod of the negative pressure chamber until the piston reaches the top, and insert the blocking needle around the nerve located by ultrasound;

[0046] (2) Block the through hole A at the top of the piston rod with your finger and press the piston rod downward to perform negative pressure suction;

[0047] (3) If there is no blood return, pull the piston rod of the negative pressure chamber to the top to open the liquid inlet of the negative pressure chamber;

[0048] (4) Pressing down the piston rod of the liquid medicine chamber to open the liquid medicine inlet of the liquid medicine chamber and injecting the liquid medicine;

[0049] Preferably, the steps further include: (5) if there is blood return, opening the through hole A, pulling the piston rod of the negative pressure chamber to the top, and the positive pressure generated will discharge the blood sucked into the negative pressure chamber through the through hole A at the top of the hollow cylinder of the piston rod;

[0050] (6) Use the ultrasound probe to reposition the nerve and repeat steps (1)-(4).

[0051] The invention provides a nerve blocking device which can be operated with one hand. The device is composed of a positive pressure syringe, a connecting tube, a medicine injection device, a suction device and a nerve blocking needle.

[0052] As for the separate liquid medicine chamber and negative pressure chamber, in terms of the connection sequence, the positive pressure syringe is connected to the extension tube, the extension tube is connected to the injection device, then connected to the negative pressure device, and finally connected to the blocking needle;

[0053] Positive pressure syringe: A new compression spring device is added inside the syringe to provide positive pressure for injection. A one-way valve is built into the head of the injector to ensure that the liquid medicine is still stored in the syringe under the positive pressure of the spring. Positive pressure syringe: A new compression spring device is added inside the syringe. The compression spring device controls the piston rod to provide positive pressure for injection. A one-way valve is built into the head of the injector to ensure that the liquid medicine is still stored in the syringe under the positive pressure of the spring.

[0054] Connecting tube: The connecting tube is connected to the syringe end, inserted into the syringe, and opens the one-way valve to ensure smooth outflow of the drug solution; the connecting tube is connected to the blocking needle end, and a drug injection switch and a suction device are added to support a single person to complete the back extraction check whether it has entered the blood vessel by mistake and the drug injection operation.

[0055] Drug injection device (drug injection chamber): When the spring is at rest, the connection port with the connecting tube is closed by the piston in the device. Press the button to the bottom to open the connection port between the fluid pipeline and the connecting tube. The drug liquid is pressed out due to the positive pressure in the syringe. Release the button, the spring returns to its position, and the connection port is closed again. The top and bottom openings ensure that the device is at atmospheric pressure.

[0056] Suction device (negative pressure chamber): After the blocking needle pierces the human tissue, press the push button, close the upper opening of the hollow tube with your finger, press the movable rubber plug at the lower end, and the left injection device is not opened and is in a closed state. At this time, negative pressure suction force is generated at the negative pressure generating position, and it can be observed whether blood is drawn out; if blood is drawn out, relax the upper opening of the hollow tube, lift the push button, and the blood flows from the lower opening of the hollow tube through the hollow tube to the upper opening of the hollow tube. The blood is discharged and the device is restored. When the push button is lifted to the top, the injection device is connected to the open flow position and the blocking needle to ensure the outflow of the liquid; the lower opening ensures that the lower end of the device is connected to the atmospheric pressure.

[0057] Nerve blocking needle: It is a commonly used clinical blocking needle with a scale, that is, the tip of the needle is a circular opening to avoid nerve damage. In order to adapt to the integrated negative pressure chamber + liquid medicine chamber structure of the present invention, the needle tail of the blocking needle has been adaptively improved, and the needle tail is designed as a double-channel tube structure to simultaneously connect to the connection port A of the negative pressure chamber and the connection port B of the liquid medicine chamber.

[0058] The present invention provides a nerve block device that can be operated with one hand, which has the following advantages: 1) the device is made of common medical materials and has low cost; 2) it enables a single person to complete the ultrasound-guided nerve block technology, making the operator's operation simpler and improving the tissue effect.

[0059] The one-handedly operable nerve block device provided by the present invention, regardless of whether the liquid medicine chamber and the negative pressure chamber are integrated or split structures, can enable the operator to operate the ultrasonic probe with one hand and hold the blocking needle with the other hand, and only use the thumb of the same hand that operates the blocking needle to complete actions such as pressing down / pulling up the piston rod and then completing operations such as suction and injection. Even if it is a split structure, the distance between the liquid medicine chamber and the negative pressure chamber is very close, and the volumes of each are not large. After installation, the entire nerve block device can be completely grasped and operated by the hand holding the blocking needle. The greatest contribution of the present invention is that the suction and injection actions that require the cooperation of two people in traditional nerve block operations can be completed by the pressing action of the thumb of one hand, which greatly liberates manpower, simplifies the operation steps, saves operation time, and improves operation efficiency. It has broad and good clinical application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic structural diagram of a positive pressure syringe provided in one embodiment of the present invention.

[0061] Figure 2 A schematic structural diagram of a positive pressure syringe provided in another embodiment of the present invention.

[0062] Figure 3 A schematic diagram of the structure of a medicine liquid chamber provided in one embodiment of the present invention.

[0063] Figure 4A schematic diagram of the negative pressure chamber structure provided for one embodiment of the present invention.

[0064] Figure 5 A schematic structural diagram of an integrated drug liquid chamber and negative pressure chamber provided in another embodiment of the present invention.

[0065] Figure 6 A schematic structural diagram of a blocking needle adapted to an integrated drug liquid chamber and a negative pressure chamber provided in another embodiment of the present invention.

[0066] Figure 7 A schematic structural diagram of an elastic one-way valve in a positive pressure syringe provided by one embodiment of the present invention.

[0067] The markings in the figure are listed as follows: 1-positive pressure syringe, 11-injection port, 12-elastic one-way valve, 121-arc-shaped spring, 13-syringe, 14-push rod, 15-push rod spring; 2-drug liquid chamber, 21-connecting port B, 22-drug liquid inlet of the drug liquid chamber, 23-piston, 231-piston body, 2311-drug liquid channel, 232-piston rod, 24-bottom opening of the drug liquid chamber, 25-spring, 26-limiting block, 27-top opening; 3-negative pressure chamber, 31-connecting port A, 32-drug liquid inlet of the negative pressure chamber, 33-piston, 331-piston body, 3311-drug liquid channel, 332-piston rod, 3321-through hole A, 3322-through hole B, 34-bottom opening of the negative pressure chamber; 4-blocking needle, 41-needle tail; 5-connecting tube. DETAILED DESCRIPTION

[0068] The present invention will be further described in detail below through specific embodiments in combination with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0069] The first group of embodiments, the nerve block device of the present invention that can be operated with one hand

[0070] This group of embodiments provides a nerve block device that can be operated with one hand. In all embodiments of this group, the nerve block device that can be operated with one hand has the following common features: the device includes a positive pressure syringe 1 for storing nerve block liquid, a liquid chamber 2 for controlling injection, and a negative pressure chamber 3 for suction;

[0071] The negative pressure chamber 3 is a hollow cavity structure, and a connection port A-31 that can be connected to the blocking needle is opened on the side wall of the cavity, or a connection port A-31 that can be connected to the blocking needle and a liquid medicine inlet 32 ​​for liquid medicine to enter are opened on the side wall of the cavity; the positions of the connection port A-31 and the liquid medicine inlet 32 ​​do not conflict;

[0072] A piston 33 is arranged inside the negative pressure chamber 3; the piston 33 comprises a piston body 331 and a piston rod 332, the piston rod 332 extends out of the nerve blocking device by extending out of the top of the negative pressure chamber 3; the piston rod 332 is a hollow cylinder, and a through hole A-3321 is provided on the top of the hollow cylinder, and a through hole B-3322 is provided on the bottom side wall of the hollow cylinder; a liquid medicine channel 3311 is transversely provided on the piston body 331 for liquid medicine to pass through; the inlet of the liquid medicine channel 3311 can be connected and sealed with the liquid medicine inlet 32; the outlet of the liquid medicine channel 3311 can be connected and sealed with the connection port A-31;

[0073] The liquid medicine chamber 2 is a hollow cavity structure, and a connection port B-21 and a liquid medicine inlet 22 for liquid medicine to enter the liquid medicine chamber are provided on the side wall of the cavity; the connection port B-21 and the liquid medicine inlet 22 are not in conflict with each other; a piston 23 is provided inside the liquid medicine chamber 2, and the piston 23 in the liquid medicine chamber 2 can close or open the liquid medicine inlet 22 and the connection port B-21 by moving up and down; the piston 23 includes a piston body 231 and a piston rod 232, and the piston body 231 is laterally provided with a liquid medicine channel 2311 for liquid medicine to pass through; the inlet of the liquid medicine channel 2311 can be connected to the liquid medicine inlet 22 and be tightly connected; the outlet of the liquid medicine channel 2311 can be connected to the connection port B-21 and be tightly connected;

[0074] The positive pressure syringe 1 provides positive pressure to push the internal drug solution outward, and the injection port 11 thereof is connected to the drug solution inlet 22 of the drug solution chamber 2 through the connecting tube 5 .

[0075] In some embodiments, Figure 5 As shown, the negative pressure chamber 3 and the liquid medicine chamber 2 are an integrated structure;

[0076] The medicine liquid chamber is arranged at the lower part of the negative pressure chamber; the piston 23 of the medicine liquid chamber 2 is the same as the piston 33 of the negative pressure chamber 3; the cavity from the top of the piston body 331 to the inner wall of the top of the device is the negative pressure chamber 3; the cavity from the bottom of the piston body 331 to the inside of the bottom of the device is the medicine liquid chamber 2.

[0077] In a further embodiment, a limit block 26 is provided on the inner wall of the medicine liquid chamber 2 near the bottom, which is used to limit the lower limit of the negative pressure chamber 3. During actual operation, when the piston rod 332 is pressed down by the thumb with one hand to generate negative pressure, the limit block 26 is needed to limit the descending space of the piston body 331. When the piston 33 touches this position, the device is at the lower limit of the negative pressure chamber 3, and the space below the limit block is the medicine injection chamber. The setting height of the limit block is equal to the diameter of the medicine liquid channel 3311 in the piston body 331, which is equal to the caliber of the medicine liquid inlet 22 and the caliber of the connecting port B-21.

[0078] The piston 331 is made of elastic material, and can go over the blocking position of the limit block 26 by increasing the push-pull force, and can connect the liquid medicine channel further downward. The elastic material is selected from: rubber, latex, silicone, elastic plastic, etc.

[0079] The side wall of the negative pressure chamber 3 is provided with only a connection port A-31 which can be connected to the blocking needle;

[0080] The liquid medicine inlet 22 and the connection port B-21 of the liquid medicine chamber 2 are respectively arranged at two opposite positions on the side wall of the liquid medicine chamber 2 and the heights of the two are consistent;

[0081] Preferably, the distance from the through hole A-3321 of the negative pressure chamber 3 to the top of the piston body 331 is a, the distance from the top to the bottom of the inner wall of the device is b, the height of the piston body 331 of the piston 33 is c, the distance from the connection port A-31 of the negative pressure chamber 3 to the connection port B-21 of the medicine liquid chamber 2 is d, the distance from the bottom of the medicine liquid channel 3311 of the piston body 331 to the bottom of the piston body 331 is e, the distance from the top of the medicine liquid channel 3311 of the piston body 331 to the top of the piston body 331 is j, the caliber of the connection port A-31 is i, the caliber of the connection port B-21 is f, the caliber of the medicine liquid inlet 22 is g, the diameter of the medicine liquid channel 3311 is h, and the distance from the limit block 26 to the bottom of the inner wall of the medicine liquid chamber 2 is k, where a≥b–c=e, c≥d, e>f=g=h=k, j>i.

[0082] Specifically, the limiting block 26 is a protruding structure on the inner wall of the liquid medicine chamber.

[0083] In a specific embodiment, a bottom opening 24 is formed at the bottom of the nerve blocking device.

[0084] The connection port A-31 of the negative pressure chamber 3 and the connection port B-21 of the liquid medicine chamber 2 are located on the same side, and the needle tail 41 of the blocking needle 4 is a double-channel tube structure that can be connected to the connection ports A and B respectively. Figure 6 As shown;

[0085] Preferably, the two-way pipe structure is made of hard material.

[0086] In other embodiments, Figure 3 and Figure 4 As shown, the negative pressure chamber 3 and the liquid medicine chamber 2 are separate structures;

[0087] The liquid medicine chamber 2 and the negative pressure chamber 3 are respectively arranged at different positions on the passage of the liquid medicine flow, and the liquid medicine chamber 2 is arranged upstream of the negative pressure chamber 3;

[0088] The side wall of the negative pressure chamber 3 is provided with a connection port A-31 that can be communicated with the blocking needle and a liquid medicine inlet 32 ​​for liquid medicine to enter;

[0089] The liquid medicine inlet 32 ​​of the negative pressure chamber 3 can be connected to the connection port B-21 of the liquid medicine chamber 2 through the connecting tube 5;

[0090] The bottom of the negative pressure chamber 3 is provided with a bottom opening 34 communicating with the atmosphere;

[0091] The bottom of the liquid medicine chamber 2 is provided with a bottom opening 24 communicating with the atmosphere.

[0092] In a preferred embodiment, a spring 25 is mounted on one end of the piston rod 232 of the liquid medicine chamber 2 located in the chamber and close to the piston body 231;

[0093] More preferably, the height of the spring 25 in the natural state is a, the distance from the top to the bottom of the inner wall of the liquid medicine chamber 2 is b, the height of the piston body 231 is c, the distance from the bottom of the liquid medicine channel 2311 of the piston body 231 to the bottom of the piston body 231 is d, the height from the lowest point of the liquid medicine inlet 22 to the top of the inner wall of the liquid medicine chamber 2 is f, and the height from the highest point of the liquid medicine inlet 22 to the top of the inner wall of the liquid medicine chamber 2 is e, wherein a+c>f, e>a+cd, bf=d;

[0094] Preferably, a top opening 27 is provided at the top of the liquid medicine chamber, and the function of the top opening 27 is the same as that of the bottom opening 24, so that the upper part of the liquid medicine chamber is connected to the atmosphere and the movement of the piston in the chamber is not hindered.

[0095] In a more preferred embodiment, in the positive pressure syringe 1, an elastic one-way flap 12 is provided at one end of the syringe barrel 13 near the injection port 11 of the syringe, which can close the injection port 11. The elastic one-way flap 12 is usually made of elastic materials such as silicone / rubber / latex; the elastic one-way flap 12 can be selected from the following structural forms:

[0096] In some specific embodiments, the elastic one-way valve 12 includes two arc-shaped spring pieces 121; the bottom periphery of the arc-shaped spring piece is adapted to the inner wall periphery of the syringe near the injection port and is fixedly connected to the inner wall of the syringe, the side edges of the two arc-shaped spring pieces are adapted to each other and closed to each other, and the top edges of the two arc-shaped spring pieces are adapted to each other and fit each other but not closed; in the natural state, the valve piece is a double-petal elastic structure that opens inward, that is, an attachment device to the inner wall of the syringe head.

[0097] In other specific embodiments, the elastic one-way valve 12 is a hollow cylindrical / conical / truncated cone structure with an open bottom, the open circular circumference of the bottom surface is adapted to the inner wall circumference of the syringe near the injection port end and is fixedly connected to the inner wall of the syringe, and a slit opening is provided at the top of the hollow cylindrical / conical / truncated cone structure, and the slit opening allows one end of the connecting tube to pass through.

[0098] The elastic one-way valve 12 with the above two types of structures can prevent the medicine from leaking out of the syringe when the syringe is filled with medicine and there is positive pressure pushing the medicine outward. Once the connecting tube is connected, that is, one end of the connecting tube is inserted into the elastic one-way valve 12 and its top is pushed open, the medicine can flow out smoothly.

[0099] More preferably, a push rod spring 15 is provided at one end of the push rod 14 in the syringe 13 for applying positive pressure to the liquid medicine in the syringe 1 .

[0100] Second group of embodiments, a single-person-operated nerve block method of the present invention

[0101] This group of embodiments provides a nerve blocking method that can be operated by one person, characterized in that the nerve blocking device that can be operated by one hand as described in any one of the first group of embodiments is used in combination with ultrasound-guided operation.

[0102] In a specific embodiment, one hand operates the ultrasound device to locate the nerve, and the other hand uses the one-hand-operable nerve block device to perform aspiration and injection.

[0103] In some embodiments, operating the negative pressure chamber and the liquid medicine chamber of the integrated structure comprises the following steps:

[0104] (1) Pull up the piston rod until the piston reaches the top and insert the blocking needle around the nerve located by ultrasound;

[0105] (2) Block the through hole A at the top of the piston rod with your finger and press the piston rod downward to perform negative pressure suction;

[0106] (3) If there is no blood return, loosen through hole A;

[0107] (4) Press the piston rod downward to open the drug channel and inject the drug;

[0108] In a preferred embodiment, the steps further include: (5) if blood returns, loosen the through hole A, pull the piston rod to the top, and the generated positive pressure discharges the blood sucked into the negative pressure chamber through the through hole A at the top of the hollow cylinder of the piston rod;

[0109] (6) Use the ultrasound probe to reposition the nerve and repeat steps (1)-(4);

[0110] More preferably, in step (2), pressing down the piston rod means pressing down the piston rod so that the bottom of the piston body does not exceed the limit block.

[0111] In other embodiments, operating the negative pressure chamber and the drug solution chamber of the separate structure includes the following steps:

[0112] (1) Pull up the hollow piston rod of the negative pressure chamber until the piston reaches the top, and insert the blocking needle around the nerve located by ultrasound;

[0113] (2) Block the through hole A at the top of the piston rod with your finger and press the piston rod downward to perform negative pressure suction;

[0114] (3) If there is no blood return, pull the piston rod of the negative pressure chamber to the top to open the liquid inlet of the negative pressure chamber;

[0115] (4) Pressing down the piston rod of the liquid medicine chamber to open the liquid medicine inlet of the liquid medicine chamber and injecting the liquid medicine;

[0116] In a further embodiment, the steps further include: (5) if there is blood return, opening the through hole A, pulling the piston rod of the negative pressure chamber to the top, and the positive pressure generated discharges the blood sucked into the negative pressure chamber through the through hole A at the top of the hollow cylinder of the piston rod;

[0117] (6) Use the ultrasound probe to reposition the nerve and repeat steps (1)-(4).

[0118] The most specific embodiment of the present invention provides the following device and operation: The present invention provides a nerve blocking device that can be operated with one hand. In an embodiment of a separate structure of the injection chamber 2 and the negative pressure chamber 3, the nerve blocking device includes, in order of connection and upstream and downstream order of the flow of the drug solution: a positive pressure syringe 1, a connecting tube 5, an injection device (injection chamber 2), a suction device (negative pressure chamber 3), and a nerve blocking needle 4.

[0119] like Figure 1 As shown, the positive pressure syringe is composed of a newly added compression spring device in the syringe. The outward elastic force of the spring in the tightened state enables the piston rod in the syringe to provide a positive injection pressure to the medicine liquid in the syringe. A one-way valve is built into the head end of the injector to ensure that the medicine liquid is still stored in the syringe under the positive pressure of the spring.

[0120] like Figure 4 As shown, the suction device (negative pressure chamber 3), when the blocking needle 4 pierces the human tissue, press the push button (piston rod 332), close the upper opening of the hollow tube (through hole A-3321) with your fingers, and press the movable rubber plug at the lower end. Figure 3 The injection device shown is not opened and is in a closed state. At this time, the negative pressure occurs at the position where negative pressure is generated, and negative pressure suction force is generated, and it can be observed whether blood is drawn out; if blood is drawn out, the upper opening of the hollow tube (through hole A-3321) is relaxed, and the push button is lifted up and pressed down, and blood flows from the lower opening of the hollow tube through the hollow tube (piston rod 332) to the upper opening of the hollow tube, and the blood is discharged, and the device is restored. When the push button is lifted to the top, the injection device is connected to the open flow position (drug liquid channel) and the blocking needle to ensure the outflow of the drug liquid; the bottom opening 34 ensures that the lower end of the device is connected to the atmospheric pressure.

[0121] like Figure 3In the drug injection device (drug injection chamber 2) shown, when the spring 25 is stationary, the opening at the end of the connecting tube (drug liquid inlet 22) is closed by the piston in the device, and the button (piston rod 232) is pressed down to the bottom to open the liquid flow pipeline (drug liquid channel 2311) and the connecting tube opening (drug liquid inlet 22). The drug liquid is pressed out due to the positive pressure in the syringe, and the button (piston rod 232) is released, the spring 25 returns to its original position, and the connecting port (drug liquid inlet 22) is closed again. The top opening 27 and the bottom opening 24 are used to ensure that the device is at atmospheric pressure.

[0122] The connecting tube 5 is connected to the end of the syringe 1, extends into the syringe 1, opens the one-way valve 12, and ensures smooth outflow of the drug solution. The nerve block needle 4 is a block needle with a scale commonly used in clinical practice, that is, the needle tip is a circular opening to avoid nerve damage. Therefore, the present invention designs a nerve block device that can be operated with one hand, through which a single person can complete the withdrawal check whether it has entered the blood vessel by mistake and the injection operation.

Claims

1. A nerve block device operable with one hand, characterized in that: The device comprises a positive pressure syringe for storing nerve blocking liquid medicine, a liquid medicine chamber for controlling injection and a negative pressure chamber for suction; The negative pressure chamber is a hollow cavity structure, and a connection port A that can be connected to the blocking needle is provided on the side wall of the cavity, or a connection port A that can be connected to the blocking needle and a liquid medicine inlet for liquid medicine to enter are provided on the side wall of the cavity; the positions of the connection port A and the liquid medicine inlet do not conflict; A piston is arranged inside the negative pressure chamber; the piston comprises a piston body and a piston rod, the piston rod extends out of the nerve blocking device by extending out of the top of the negative pressure chamber; the piston rod is a hollow cylinder, and a through hole A is provided on the top of the hollow cylinder, and a through hole B is provided on the bottom side wall of the hollow cylinder; a liquid medicine channel is transversely provided on the piston body for liquid medicine to pass through; the inlet of the liquid medicine channel can be connected to the liquid medicine inlet and be airtightly connected; the outlet of the liquid medicine channel can be connected to the connection port A and be airtightly connected; The liquid medicine cavity is a hollow cavity structure, and a connection port B and a liquid medicine inlet for liquid medicine to enter the liquid medicine cavity are provided on the side wall of the cavity; the connection port B and the liquid medicine inlet are not in conflict with each other; a piston is provided inside the liquid medicine cavity, and the piston in the liquid medicine cavity can close or open the liquid medicine inlet and the connection port B by moving up and down; the piston includes a piston body and a piston rod, and the piston body is transversely provided with a liquid medicine channel for liquid medicine to pass through; The inlet of the liquid medicine channel can be connected to the liquid medicine inlet and be airtightly connected; the outlet of the liquid medicine channel can be connected to the connection port B and be airtightly connected; The positive pressure syringe provides positive pressure to push the liquid medicine inside it outward, and its injection head is connected to the liquid medicine inlet of the liquid medicine cavity through a connecting tube; The negative pressure chamber and the liquid medicine chamber are an integrated structure: The liquid medicine chamber is arranged at the lower part of the negative pressure chamber; the piston of the liquid medicine chamber is the same as the piston of the negative pressure chamber; the cavity from the top of the piston body to the inner wall of the top of the device is the negative pressure chamber; the cavity from the bottom of the piston body to the inside of the bottom of the device is the liquid medicine chamber; The side wall of the negative pressure chamber is provided with only a connection port A which can be connected to the blocking needle; The liquid medicine inlet and the connection port B of the liquid medicine chamber are respectively arranged at two opposite positions on the side wall of the liquid medicine chamber and the heights of the two are consistent; A limit block is provided near the bottom of the inner wall of the medicine liquid chamber; The distance from the through hole A of the negative pressure chamber to the top of the piston body is a, the distance from the top to the bottom of the inner wall of the device is b, the height of the piston body of the piston is c, the distance from the negative pressure chamber connection port A to the drug liquid chamber connection port B is d, the distance from the bottom of the drug liquid channel of the piston body to the bottom of the piston body is e, the distance from the top of the drug liquid channel of the piston body to the top of the piston body is j, the caliber of the connection port A is i, the caliber of the connection port B is f, the caliber of the drug liquid inlet is g, the diameter of the drug liquid channel is h, and the distance from the limit block to the bottom of the inner wall of the drug liquid chamber is k, where a≥b–c=e, c≥d, e>f=g=h=k, j>i; the bottom of the nerve blocking device is provided with a bottom opening; The connection port A of the negative pressure chamber and the connection port B of the drug solution chamber are located on the same side, and the needle tail of the blocking needle is a double-channel tube structure that can be connected to the connection ports A and B respectively.

2. The one-hand operable nerve block device according to claim 1, characterized in that: The double-channel pipe structure is made of hard material.

3. The one-hand operable nerve block device according to claim 1, characterized in that: The negative pressure chamber and the liquid medicine chamber may also be separate structures: The liquid medicine chamber and the negative pressure chamber are respectively arranged at different positions on the passage through which the liquid medicine flows, and the liquid medicine chamber is arranged upstream of the negative pressure chamber; A connection port A that can be communicated with the blocking needle and a liquid medicine inlet for liquid medicine to enter are provided on the side wall of the negative pressure chamber; The liquid medicine inlet of the negative pressure chamber can be connected to the connection port B of the liquid medicine chamber through a connecting pipe; An opening is provided at the bottom of the negative pressure chamber to communicate with the atmosphere; An opening is provided at the bottom of the liquid medicine chamber to communicate with the atmosphere; The part of the piston rod of the liquid medicine chamber located in the chamber and close to the piston body is sleeved with a spring; The height of the spring in a natural state is a, the distance from the top to the bottom of the inner wall of the device is b, the height of the piston body is c, the distance from the bottom of the liquid medicine channel of the piston body to the bottom of the piston body is d, the height from the lowest point of the liquid medicine inlet to the top of the inner wall of the liquid medicine chamber is f, and the height from the highest point of the liquid medicine inlet to the top of the inner wall of the liquid medicine chamber is e, wherein a+c>f, e>a+cd, bf=d; In the positive pressure syringe, an elastic one-way valve capable of closing the injection port is arranged at one end of the syringe barrel close to the injection port of the syringe.

4. The one-hand operable nerve block device according to claim 3, characterized in that: The bottoms of the medicine liquid chamber and the negative pressure chamber are both provided with bottom openings, and the top of the medicine liquid chamber is provided with a top opening.

5. The one-hand operable nerve block device according to claim 3, characterized in that: The elastic one-way valve includes two arc-shaped spring pieces; the bottom periphery of the arc-shaped spring piece is adapted to the inner wall periphery of the syringe near the injection port and is fixedly connected to the inner wall of the syringe, and the side edges and top edges of the two arc-shaped spring pieces are adapted to and fit each other.

6. The one-hand operable nerve block device according to claim 3 or 5, characterized in that: The elastic one-way valve is a hollow cylindrical / conical / truncated cone shaped structure with an open bottom surface. The circular circumference of the open bottom surface is adapted to the circumference of the inner wall of the syringe near the injection port and is fixedly connected to the inner wall of the syringe. A slit opening is provided at the top of the hollow cylindrical / conical / truncated cone shaped structure, and the slit opening allows one end of the connecting tube to pass through.

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