JP2006314570A - Variable injection needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable injection needle, the needle tube of which is varied and bent by pulling a wire fastened to the tip portion of the needle tube, which permits the needle tube to be varied and stably and unerringly maintained in an intended direction and at an intended angle and permits the variation of only a desired part of the tip of the needle tube. <P>SOLUTION: The injection needle permits the variation and bending of the needle tube 1 by the wire 3, and is provided with a moving piece 5 with a ring 6 to fasten the other end of the wire 3 with play on the base of the needle provided in the base of the needle tube. The moving piece 5 is attached to the needle tube base 4 by a thread portion 41, and can be moved in the axial direction of the needle tube 1 by being rotated along the thread and can be fixed in an arbitrary position. The length of the tip side of the needle tube 1 can be made thinner than the base side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a medical injection needle, and more particularly to a variable injection needle whose tip can be changed into a curved shape in order to reach the target site of the needle tube tip during nerve block or the like.

When a nerve block such as a sympathetic nerve block or an abdominal nerve block is performed to the deep part of the human body, usually a 21G (gauge outer diameter of 0.81 mm) and a long needle of about 120 mm to 140 mm are used to secure an infusion route for anesthetics and the like. However, once the needle is punctured into the tissue using the CT image as an index, once the needle has been punctured into the tissue, it is difficult to change the direction of the needle tip. When there is an obstacle between the target parts, it is difficult to puncture around the target part, so that the puncture may be repeated until a good puncture is achieved. For example, in the celiac plexus block, it is necessary to puncture the needle toward the front of the first lumbar vertebra, but if the puncture position is taken too far inside, the needle tip will not advance to the front of the lumbar vertebra and will be repelled by the lumbar side edge. If the needle tip is pointed outward, and if the needle tip is taken too far, the risk of damaging the abdominal organ increases, which is a procedure with clinical difficulties. In addition, when a thin and long needle is used, the needle tube is bent during puncture, often deviating from the assumed puncture route and often deviating from the target site.
Therefore, in order to solve the above problem, the inventor of the present invention has proposed a variable bending injection needle. This injection needle is formed by a string or wire attached near the tip of the needle tube and a hollow tube covering the needle, and with the base of the needle fixed, a string or wire is attached to the root side. The needle tip or the tube can be bent by pulling, and the needle tip can be freely bent by hand operation even after puncturing the tissue with this injection needle, for example, Even when there is an obstacle in the puncture route, the needle tip can reach the target portion. (See Patent Document 1)

JP 2004-188134 A

According to the variable bending type injection needle, since the needle tip can be bent with the injection needle punctured into the tissue, there are some obstacles as described above by advancing the needle by variably bending the needle. It is possible to approach the target site, but no mention is made of fixing means for holding the needle tube in a bent state, and if the holding means is not provided, the straight line of the needle tube There is a concern that an excessive force is applied to the tissue of the puncture route due to the elastic restoring force to return to the state, which adversely affects the tissue. Further, since it is difficult to set and maintain the bending direction and angle in detail, there is a problem in the accuracy of the puncture direction at the tip of the needle tube, and there is a problem in the stability of the bending angle.
Furthermore, there is also a concern that an excessive force is applied to the tissue hitting the puncture route by pulling a string or the like so that the entire needle tube is bent.

  Therefore, the present invention is configured by fixing the wire end to the distal end portion of the needle tube and covering it with an outer cylinder, and pulling the wire so that the needle tube is variably curved, so that the needle tube can be bent in the intended direction and angle. It is an object of the present invention to provide a variable injection needle that can be stably and reliably changed and maintained, and can change only a desired portion of the tip of the needle tube.

  The variable injection needle of the present invention includes an outer cylinder that has a wire end fixed to a tip portion of a needle tube and covers the needle tube and the wire, and the needle is variably curved by pulling the wire toward the proximal side of the needle tube. In the above, the needle base provided at the base of the needle tube is provided with a movable piece that fixes the other end of the wire, is movable in the axial direction of the needle tube, and can be fixed at an arbitrary position.

As a specific example of the needle base provided at the base of the needle tube, the needle base is composed of a needle base for connecting the needle tube and a movable piece attached to the needle base, and the needle base and the movable piece are mutually connected. The engaging piece is formed, and the moving piece is movable in the axial direction of the needle tube by relatively rotating the screw portion. In addition, the movable piece is provided with a ring that is a fixed portion of the wire end portion, and the ring is not interlocked with the rotational movement of the movable piece main body, and is only interlocked with reciprocation in the axial direction. It is preferable that Incidentally, the free installation is defined as a state in which the movable piece main body and the ring are not fixed, and the ring is attached so as to be freely movable from the rotation of the movable piece.

Further, the needle tube is configured such that a desired length on the distal end side is formed with a diameter smaller than that on the proximal side, and specifically, the large diameter portion on the proximal side is formed as a double tube.

According to the variable injection needle of the present invention, with the needle tube being punctured into the tissue, which is solved by the conventional variable curved needle, the needle tip is bent by the hand operation of pulling the wire to the proximal side, and the puncture path is bent and punctured. By proceeding, even if there is an obstacle in the puncture route and linear puncture is difficult, or even if there are some obstacles such as unintentional bending in the puncture process and changing the puncture direction, the target site In addition to the effect of enabling the approach to the movable tube, the movable piece to which the wire is fixed moves in the axial direction of the needle tube and can be fixed at an arbitrary position. It can be reliably held at a desired angle. In addition, by providing a screw portion that engages the movable piece and the needle base, and rotating relatively, the movable piece is configured to move in the axial direction of the needle tube by moving up and down along the screw. The needle tube is variable in conjunction with the rotation, and the needle tube can be adjusted to an intended bending angle depending on the degree of rotation, and can be held at that position. Furthermore, the movable piece is installed without being fixed to the ring that is the fixing portion of the wire end, and the ring is linked with only the reciprocating movement in the axial direction without being linked with the rotational movement of the movable piece main body. With the structure, since the wire fixing part of the ring does not rotate, the tip of the needle tube and the wire fixed part of the ring are always held in a straight line, and the wire does not twist, thereby stabilizing the bending direction of the needle tube, There is no excessive load on the wire or needle tube. At the same time, the bending direction of the needle tube in the body can be grasped at hand.
Due to the above effects, the needle tip of the needle tube can be moved to the intended one (curving direction, angle) following the hand operation, so that fine adjustment of the puncture path is possible and at that position. Therefore, it is possible to secure and easily perform a procedure such as a nerve block.

In addition, if the desired length on the tip side of the needle tube is configured to be smaller than the base side, when the wire tube is bent to bend the tip of the needle tube, the narrow diameter portion of the tip that is weak against bending is likely to be bent. It is difficult to reach the entire needle tube by concentrating on the tip. Furthermore, when the base-side large-diameter portion is formed as a double tube, the double tube portion becomes strong and is difficult to bend, so that the effect of bending only the tip portion can be further enhanced.
As a result of the above action, it is possible to variably bend only the distal end portion that is desired to be bent, thereby eliminating the adverse effects on the tissue of the puncture route that are concerned about the entire needle tube being curved, which is safe and comfortable for human tissue. It can be an instrument.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram of an overall configuration showing a variable injection needle according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of the needle tube, and FIG. 3 is an enlarged view of the needle base.
The variable injection needle according to the present embodiment includes a needle tube 1 composed of an inner pipe 11 and an outer pipe 12, and a wire firmly attached to a tip 6 of the needle tube and a ring 6 to be described later on the other end. 3, an outer cylinder 2 that covers the wire 3 and the needle tube 1, a needle tube base 4 and an outer cylinder base 7 that connect the bases of the needle tube 1 and the outer tube 2, respectively, and an inner pipe 11. An injection needle that is basically composed of an inner needle (not shown) and an inner needle base 8 that connects the base of the inner needle, a movable piece 5 attached to the needle tube base 4 and movable in the direction of the needle tube axis; A ring 6 connected to one end of the wire 3 is provided to be freely provided on the top 5, and the movable top 5 is rotated to move the ring 6 movable in conjunction with the movable top 5. The needle tube 1 to which the wire 3 is fixed is brought to the proximal side by the fixed wire 3. The needle tube is configured to be bent or movable by being pulled or returned.

The configuration of each part will be described in detail. The needle tube 1 is composed of an inner pipe 11 and an outer pipe 12 made of a metal pipe such as a stainless steel pipe. In this example, the inner pipe 11 is projected from the tip of the outer pipe 12 by 50 mm. The tip side is configured as a single tube with only an inner pipe, and the base side is configured as a double tube structure with inner and outer pipes. Only the tip side 50 mm having a small diameter and a small bending strength is curved and variable. Further, the tip of the inner pipe 11 is provided with a cutting edge 111 for puncturing the tissue, and if necessary, a scale 13 (in this example, an interval of 10 mm) is provided over the entire length of the needle tube. Is configured.
The outer cylinder 2 is formed of a transparent and relatively hard resin tube such as a fluorine resin, and only the cutting edge 111 of the inner pipe 11 protrudes so that the needle tube 1 and the wire 3 are integrated in the lumen. The needle tube 1 is provided to cover the entire length. Further, considering the puncture of the tissue, the distal end portion is formed into a tapered shape by stretching so that a gap with the inner pipe 11 does not occur.
In this example, the wire 3 is a thin and strong metal stranded wire, and one end of the wire 3 is welded to the wire fixing portion 31 which is within 10 mm from the tip of the inner pipe 11 and is the back side of the blade surface 111 by soldering. Then, the other end is passed through a small hole (not shown) provided corresponding to the wire fixed portion 32 of the ring 6 of the needle base described later, the end is connected, and the tie is further connected. Glued and fixed. The wire 3 moves in the direction of the needle tube axis so that the needle tube 1 can be bent and moved by the wire 3 being fixedly connected to the wire fixed portion 31 at the tip of the needle tube and the wire fixed portion 32 of the base ring 6. be able to.

The needle tube base 4 is a molded or cut product made of a resin having a female luer taper which can connect a needle tube 1 to the front end side by adhesion and a rear end side to which a syringe barrel or the like can be connected for chemical injection, etc. A threaded portion 41 that engages with a movable piece 5 to be described later is provided at an intermediate portion between the needle tube bonding portion on the side 4 (a) and the luer taper portion on the rear end side 4 (b). 5 was configured to be movable. The needle tube base tip side 4 (a) is provided with a through hole (not shown) as a passage for the wire 3 at a position where the wire 3 is in a straight line from the fixed contact portion 31 of the needle tube tip. A chipped portion 42 is provided to allow the wire to pass therethrough so that the wire 3 can pass through a linear path as much as possible.
The movable piece 5 is a cylindrical member that is attached to the screw portion 41 of the needle tube base 4 and has a screw processing (not shown) that engages with the screw portion 41 in the inner cavity. In addition, a groove 51 is provided on the outer peripheral surface to allow ring 6 to be described later. And as above-mentioned, it is set as the structure which can be moved back and forth by rotating along the screw in the range of the screw part 41.
The ring 6 has one end of the wire 3 fixedly contacted in the manner described above, and is fitted in the groove 51 of the movable piece 5 so as to be loosely provided, so that the ring 6 is larger than the outer diameter of the groove 51 and is movable. It is comprised by the ring-shaped metal which has an internal diameter smaller than the outer diameter of. And, by the structure provided loosely in this groove 51, it has a structure that does not follow the rotational movement of the movable piece 5, but only interlocks with the reciprocating movement back and forth in the axial direction of the needle tube 1, The fixed contact portion 31 of the needle tip that becomes the fixed contact portion of the wire 3 and the fixed contact portion 32 of the ring 6 can always be in a straight line.
The outer cylinder base 7 connects the base end part of the outer cylinder 2, and the base end part is opened in a flared shape, and the opening part is sandwiched and fixed by the outer cylinder basic body 71 and the cap 72. . Further, a wire take-out hole 711 is provided as a passage of the wire 3 at a position where the wire 3 is in a straight line from the fixed contact portion 31 at the tip of the needle tube, and the wire 3 is taken out from the inside of the outer cylinder base 7.
The inner needle base 8 is connected to a proximal end portion of an inner needle (not shown) provided so that the tissue does not enter the lumen of the needle tube 1 when puncturing the tissue, and the distal end side is a luer at the rear end portion of the needle tube base 4. A male luer taper that engages the taper is formed.
Here, when the passage of the wire 3 is confirmed, it passes through the outer cylinder 2 in parallel with the needle tube 31 from the wire fixed portion 31 at the tip of the needle tube 1, and is taken out from the wire extraction hole 711 of the outer cylinder base 7. It passes through the through-hole (not shown) of the base 4, and comes out again at the notch 42, passes through a small hole (not shown) of the ring 6, and goes out to the back side to the wire fixing part 32 of the ring 6. To reach. As described above, the wire 3 is always positioned in a straight line.

FIG. 3 shows a straight state and a curved state of the present embodiment, and the variable means of the variable injection needle will be described again with reference to the drawing.
When the needle tube 1 is linear, the movable piece 5 is in contact with the foremost portion of the threaded portion 41 of the needle tube base 4 (FIG. A). When rotating clockwise (in the direction of the arrow), the movable piece 5 is moved rearward in the axial direction of the needle tube 1, but the ring 6, which is loosely provided on the movable piece 5 and firmly contacts the wire 3, is also linked in the axial direction. By moving rearward, the wire 3 is pulled toward the needle base side, and the distal end side of the needle tube 1 is bent and variable from a portion that is 50 mm away from the distal end where the needle tube 1 is easily bent. Then, it is rotated until a desired angle is obtained, and if the rotation is stopped at that position, the curved shape is maintained there.

FIG. 1 is an overall configuration schematic diagram showing a variable injection needle of an embodiment of the present invention. The enlarged schematic diagram which shows the needle tube part of the said embodiment The enlarged view which shows the needle base part of the said embodiment The schematic diagram which shows the linear state and curved state of the said embodiment

Explanation of symbols

1. Needle tube 11. Inner pipe 112. Bent part 12. Outer pipe Outer cylinder 3. Wire 31. Wire fixing part (needle tube side)
32. Wire fixing part (ring side)
4). Needle tube base 41. 4. Screw part Movable top 51. Groove 6. Ring 7. Outer cylinder base 8. Inner needle base

Claims (5)

  A needle base provided at the base of the needle tube is provided in an injection needle having a wire end fixed to the distal end portion of the needle tube, and having an outer cylinder coated with the needle tube and the wire, and which is variably bent by pulling the wire toward the needle tube base side. A variable injection needle provided with a movable piece fixed to the other end of the wire, movable in the axial direction of the needle tube, and fixed at an arbitrary position. The needle base provided at the base of the needle tube is composed of a needle base that connects the needle tube and a movable piece attached to the needle base, and a threaded portion that engages with the needle base and the movable piece is formed. The variable injection needle according to claim 1, wherein the movable piece is movable in the axial direction of the needle tube by a relative rotation operation of the parts. The variable according to claim 2, wherein the movable piece is loosely provided with a ring that is a fixing portion of the wire end, and the ring is not interlocked with the rotational movement of the movable piece main body but is only interlocked with movement in the axial direction. Formula needle. 4. The variable injection needle according to claim 1, wherein the needle tube is formed such that a desired length on a distal end side is smaller in diameter than a proximal side. 5. The variable injection needle according to claim 4, wherein the large diameter portion on the proximal side of the needle tube is formed as a double tube.

Images