JP2019166018A - Medical instrument introducer - Google Patents

Abstract

To provide an introducer capable of quickly fastening a cap with a small number of rotations, suppressing loosening of the cap, and sealing and fixing a guide wire or the like reliably.SOLUTION: According to this invention, there is provided an introducer comprising: an introducer body comprising a tubular proximal part, with a male screw part formed on an outer peripheral part of the proximal part and a hollow part formed in the proximal part; a cylindrical valve body provided in the hollow part; and a cap comprising a cylindrical cap body having a bottom part, and a tubular insertion part extending from the bottom part outward inside the cap body. An inner peripheral part of the cap body has a female screw part to screw with the male screw part on the proximal part, and a lock part having an outer diameter larger than an inner diameter of the hollow part is formed on the bottom part side of the insertion part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an introducer for a medical instrument that is used to insert a dilator, a catheter, or the like into a living body, and in particular, a cylindrical cap that is screwed onto an outer peripheral portion of a base portion of an introducer body is tightened (screwed forward). The present invention relates to an introducer for a medical device provided with a lock mechanism (lock portion) that prevents the cap from loosening.

  When a long instrument used for medical treatment such as a dilator or a catheter is inserted into a living body such as a blood vessel, for example, Japanese Patent Application Laid-Open No. 2007-20784 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2008-125912 (Patent Document). A medical device introduction assist device called an introducer as described in 2) is used. An introducer is a tubular base that is connected to an elongated tube generally called a sheath to guide and support a long device or a wire or fluid introduced through the long device into a living body, and a sheath. In order to fix the inserted wire and the like in a liquid-tight manner, a cylindrical valve body disposed in a hollow portion inside the base portion, and a cylindrical shape having a bottom portion that is attached to the outer peripheral portion of the base portion so as to be capable of screwing back and forth. Has a cap.

  Moreover, as a procedure for actually introducing a long instrument such as a dilator or a catheter into a living body, a sheath connected to the base of the introducer is inserted into a living body such as a blood vessel, and then or simultaneously, a long wire such as a guide wire is used. The member is introduced into the living body by being guided through a cap, a hollow portion of the base portion, and a valve body installed in the hollow portion into a sheath held by a blood vessel or the like. Then, when the cap screwed on the rear end side of the base is screwed up, the valve body is pressed by the tubular projection inside the cap and the inner diameter of the insertion hole of the valve body is reduced. Thus, the long member such as the guide wire inserted into the insertion hole is tightened by the valve body, sealed and fixed.

  As described above, sealing and fixing of a long member such as a guide wire used in a dilator or the like is performed by screwing so that a cap screwed on the rear end side of the base of the introducer is tightened. Even if it is for a short time, if a gap is generated between a long member such as a guide wire and the valve body, blood or chemicals will flow backward and leak, so that the long member such as a guide wire can be quickly sealed and Need to be fixed.

  However, in the case of the introducers described in Patent Documents 1 and 2, for example, in order to prevent loosening due to the reaction force received from the elastically deformed valve body by tightening the cap, the base of the introducer and the thread of the cap The lead amount is reduced and the pitch is also set finely. That is, in the case of the introducers described in Patent Documents 1 and 2, the cap is loosened among the reaction forces received from the elastically deformed valve body by reducing the lead amount and pitch of the introducer base and the cap thread. The horizontal component acting in the direction is reduced.

  For this reason, the introducers described in Patent Documents 1 and 2 cannot be fastened to the base of the introducer unless the cap is rotated many times, and a long member such as a guide wire used for a dilator or the like can be used for a short time. There was a problem that it could not be quickly sealed and fixed in between.

  On the other hand, in order to quickly tighten the cap to the introducer base with a small number of revolutions, it is also conceivable to increase the lead amount of the introducer base and the cap thread and to set the pitch coarsely. However, if the thread lead amount is increased and the pitch is increased, the horizontal component force acting in the direction of loosening the cap increases in the reaction force received from the elastically deformed valve body. There has been a problem that a long member such as a guide wire used for a dilator or the like cannot be safely and reliably sealed and fixed.

JP 2007-20784 A JP 2008-125912 A

  Therefore, the present invention enables a tubular base part for inserting a guide wire used for a dilator or the like, a cylindrical valve body installed in a hollow part of the base part, and a screw advance / retreat to the outside of the base part In a medical introducer with a cylindrical cap with a bottom to which it is attached, it is possible to quickly tighten the cap to the base of the introducer with a small number of rotations, yet without causing the cap to loosen, a guide wire, etc. It is an object of the present invention to provide a medical introducer capable of safely and reliably sealing and fixing a long member.

  The present inventors seal a long member such as a guide wire used in a dilator or the like by pressing and elastically deforming the valve body by tightening a cap against a base of the introducer, among medical introducers. In addition, for the medical introducer of the type to be fixed, the cap tightening structure was intensively studied. As a result, when tightening the cap, it is most effective to prevent the cap from loosening by strongly bringing the insertion portion or the cap body provided inside the cap into contact with the rear end of the base of the introducer body. As a result, the present invention has been completed.

More specifically, according to the present invention, an introducer body having a tubular base for inserting a guide wire,
A male screw portion is formed on the outer peripheral portion of the base portion,
Inside the base portion, a hollow portion is formed to penetrate from the front end portion to the rear end portion, the introducer body, and
In order to fix the guide wire in a liquid-tight manner, a cylindrical valve body disposed in a hollow portion of the introducer body, a cylindrical cap body having a bottom, and the inside of the cap body A cap having a tubular insertion portion extending outward from the bottom,
On the inner peripheral part of the cap body, a female thread part that is screwed with a male thread part of the base part of the introducer body is formed.
Provided is a medical instrument introducer including the cap and having a lock portion formed on the bottom side of the insertion portion, the outer diameter of which is larger than the inner diameter of the hollow portion of the base portion of the introducer body. .

  In the introducer for a medical instrument of the present invention, the tubular base is mainly used for inserting and guiding a guide wire or the like used for a dilator or the like. The introducer for a medical device of the present invention may include a tubular branch portion that communicates with the hollow portion of the base portion and is inclined to the rear end portion side with respect to the base portion. For example, it can be used to introduce a conducting wire or fluid. Furthermore, the introducer for a medical device of the present invention may include a tubular second branch portion that is provided so as to communicate with the hollow portion of the base portion and to be substantially orthogonal to the base portion. The branch portion can be used for introducing a fluid such as a chemical solution used in a dilator, for example.

  The introducer for a medical instrument according to the present invention is planned to be used as a component part of a dilator, a catheter or the like. The basic structure of the introducer body is a tubular base having a hollow part. It is enough to have Moreover, as another structure, it has the shape of what is called a Y-type connector provided only with the tubular branch part provided by inclining to the rear-end part side with respect to the tubular base part and the base part as mentioned above. Introducer body, introducer body having the shape of a so-called T-shaped connector provided with only a tubular base portion and a tubular second branch portion provided so as to be substantially orthogonal to the base portion, or the base portion and the base portion The introducer body may have a so-called Y-type T-type composite connector shape that includes two branch portions, ie, a branch portion that is inclined with respect to the second branch portion that is substantially orthogonal.

  A male screw part that is screwed with a female screw of a cap, which will be described later, is formed on the outer peripheral part of the base part, and a hollow part that penetrates from the front end part to the rear end part for inserting the guide wire inside the base part Is formed. The hollow portion includes a reduced diameter portion formed on the distal end portion side of the base portion, and an enlarged diameter portion formed on the rear end portion side of the base portion connected to the reduced diameter portion via the stepped portion. It is preferable.

  When the hollow portion has a reduced diameter portion and an enlarged diameter portion, by contacting one end of a valve body described later to a step portion formed between the reduced diameter portion and the enlarged diameter portion, The valve body can be stored and fixed accurately and easily at a predetermined position in the enlarged diameter portion. Then, by tightening (screwing) the cap, the other end of the valve body is pressed by the distal end of the insertion portion inside the cap, but the stepped portion in the hollow portion is pressed. Is firmly supported from one end portion on the opposite side and prevented from moving in the pressing direction, so that the elastic deformation of the valve body by the insertion portion is promoted, and the valve body allows a long member such as a guide wire to be Safe and reliable sealing and fixing.

  A cap attached to the outer periphery of the base of the introducer main body so as to be able to advance and retreat is a cylindrical cap main body having a bottom, and a tubular shape concentrically extending from the bottom to the outside inside the cap main body. It has a double tube structure consisting of an insertion part. The cylindrical inner periphery of the cap body is formed with a female screw portion that is screwed with the male screw portion of the base portion of the introducer main body, and the insertion portion has a length such as a guide wire used for a dilator or the like. A through-hole penetrating from the front end portion to the rear end portion of the bottom portion for inserting the scale member is formed.

  A lock portion having an outer diameter larger than the inner diameter of the hollow portion of the base portion of the introducer body is formed on the bottom side of the tubular insertion portion extending from the bottom portion toward the outside inside the cap body. In addition to the lock part, a second lock part having an inner diameter smaller than the outer diameter of the outer peripheral part of the base part of the introducer body may be formed on the bottom side of the main body of the cap.

  For example, in the case of a lock part provided in the insertion part of the cap, the outer diameter is the same as the inner diameter of the hollow part of the base part of the introducer body or the outer peripheral surface continuously expanding from the insertion part smaller than that. It connects to the lock | rock part which has an outer diameter larger than the internal diameter of the hollow part of a base through the taper part which has. For this reason, even if the outer diameter of the lock portion of the insertion portion is larger than the inner diameter of the hollow portion of the base portion, the outer peripheral surface of the lock portion is tightened (screwed) against the base portion of the introducer body. While slightly elastically deforming, it can be advanced so as to ride on the inner peripheral surface of the hollow portion and can be brought into strong contact with the inner peripheral surface of the hollow portion.

  For example, in the case of the second lock portion provided in the cap body, the inner diameter is the same as the outer diameter of the outer peripheral portion of the base portion of the introducer main body or is larger than the inner peripheral surface of the cylindrical portion of the cap main body. The second lock portion having an inner diameter smaller than the outer diameter of the outer peripheral portion of the base portion is connected through a tapered portion having an inner peripheral surface that is reduced in diameter. For this reason, even if the inner diameter of the second lock part of the cap body is smaller than the outer diameter of the outer peripheral part of the base part, by tightening (screwing) the cap to the base part of the introducer body, The inner peripheral surface of the lock portion can be made to run on the outer peripheral surface of the base portion while being slightly elastically deformed to be brought into strong contact with the outer peripheral surface of the base portion.

  As described above, the introducer for a medical device according to the present invention is provided with an original lock mechanism (lock portion, second lock portion) on the cap insertion portion and / or the cap main body, so that the cap is attached to the introducer main body. When tightened (screwed) with respect to the base portion, the lock portion of the cap insertion portion and / or the second lock portion of the cap main body is connected to the inner peripheral surface and / or the base portion of the hollow portion of the base portion of the introducer main body. The cap can be securely contacted or engaged with the outer peripheral surface of the cap, and the cap can be reliably prevented from loosening.

  In particular, the cap locking mechanism (locking portion, second locking portion) of the present invention strongly contacts or engages only in the hollow portion of the base portion of the introducer body and / or the rear end portion of the outer peripheral portion of the base portion. The cap can be prevented from loosening and the cap can be tightened smoothly (screwed) without causing any resistance that prevents the cap from rotating while the cap is tightened (screwed). To do.

  In order to allow the cap to be quickly tightened to the base of the introducer body with a small number of rotations, the lead amount of the base part of the introducer body and the cap thread can be increased, and the pitch can be coarsened. In this case, of the reaction force received from the elastically deformed valve body, the force of the horizontal component acting in the direction of loosening the cap increases, so that the cap cannot be prevented from loosening only by the frictional force of the screw portion.

  However, the cap locking mechanism (the lock portion, the second lock portion) of the present invention is provided separately from the introducer body and the screw portion provided in the cap, and the hollow portion of the base portion of the introducer body. And / or strong contact or engagement only at the rear end of the outer periphery of the base, so that the cap is firmly fixed to the introducer body when tightening is completed without being affected by the lead amount or pitch of the thread. Then, the insertion hole of the valve body itself can be liquid-tightly closed by elastic deformation of the valve body, or a long member such as a guide wire used for a dilator or the like can be sealed and fixed safely and reliably.

  The introducer for a medical device of the present invention has a base side engaging portion formed on the outer peripheral portion of the base portion of the introducer body in the circumferential direction and adjacent to the terminal end side of the male screw portion, and a cap It is preferable that the inner peripheral portion of the main body has a cap side engaging portion that is formed adjacent to the starting end side of the female screw portion and engages with the base side engaging portion.

  Further, when the introducer for a medical device of the present invention has the above-described base side engaging portion and the cap side engaging portion, the cap side engaging portion is the base side engaging portion of the female thread portion of the cap body. It is preferable that it is arranged so as to be screwed with the male screw portion of the base portion on the distal end side of the base portion from the position where it engages.

  As described above, when the base side engaging portion is provided at the base of the introducer body, the cap side engaging portion is provided at the cap body, and when the cap is advanced to tighten the cap against the base of the introducer body, If the base side engaging part and the cap side engaging part are placed so that the engagement (position) comes before (becomes front) the screwing (position) of the base part of the introducer body and the cap body, Even when the screwing is disengaged from the base portion of the introducer body, the movement of the cap toward the rear end portion of the base portion (movement in the direction in which the cap falls off the base portion) is restricted. For this reason, in the present invention, the cap is reliably prevented from falling off from the base portion of the introducer body even after the cap is loosened.

  The base side engaging portion provided at the base portion of the introducer main body is, for example, a convex bulging outward in the radial direction formed on the outer peripheral portion of the base portion in the circumferential direction and adjacent to the terminal end side of the male screw portion. On the other hand, the cap side engaging portion provided in the cap body on the inner peripheral portion of the cap body is on the start end side of the female screw portion. It can be set as the protrusion part which protruded toward the radial direction center engaging with the convex part or recessed part of the base part of the introducer main body formed adjacently. The protrusions that bulge outward in the radial direction or the recesses that are recessed inward in the radial direction, and the protrusions that engage with the protrusions or the recesses and protrude toward the center in the radial direction have a simple structure and are engaged. Since the reliability of the fitting is high, it is suitable for preventing the cap from coming off.

  As described above, the introducer for a medical device according to the present invention is suitable for introduction of long medical devices such as dilators and catheters, and long members such as guide wires used in these long medical devices. Is tightened (screwed) with respect to the base of the introducer body, the lock part of the cap insertion part and / or the second lock part of the cap body is the inner periphery of the hollow part of the base part of the introducer body. Since the surface and / or the outer peripheral surface of the base portion is in strong contact with or engages with each other, it is possible to reliably prevent the cap from loosening.

  In particular, the locking mechanism (locking portion, second locking portion) of the cap of the present invention strongly contacts or engages only at the hollow portion of the base portion of the introducer body and / or the rear end portion of the outer peripheral portion of the base portion. , Cap resistance is not generated while the cap is tightened (screwed), preventing the cap from loosening, and it is possible to prevent the cap from loosening and to tighten the cap smoothly (screwing). To.

  As a result, the introducer for a medical device according to the present invention can be used even if the lead amount and pitch of the thread are set so that the cap can be quickly tightened to the base of the introducer body with a small number of rotations. When tightened to the base, the cap is firmly fixed to the introducer body, and the insertion hole of the valve body itself is closed fluid-tight by elastic deformation of the valve body, or a long member such as a guide wire used for a dilator, etc. It has an excellent effect that it can be safely and reliably sealed and fixed.

  The introducer for a medical device according to the present invention is provided with a base side engaging portion at the base of the introducer body, a cap side engaging portion at the cap body, and tightening the cap against the base of the introducer body. Thus, the engagement (position) of the base side engaging portion and the cap side engaging portion comes before (in front of) the screwing (position) of the base portion of the introducer body and the cap body. Therefore, even when the screwing of the cap is disengaged from the base portion of the introducer body, the movement of the cap toward the rear end portion of the base portion is restricted. For this reason, in this invention, there exists an outstanding effect that it can prevent reliably that a cap falls from the base part of an introducer main body.

It is a schematic diagram of the introducer for medical instruments concerning this embodiment incorporating a dilator. It is a longitudinal cross-sectional view of the introducer for medical devices which concerns on this embodiment shown by FIG. It is a longitudinal cross-sectional view of the introducer main body of the introducer for medical devices which concerns on this embodiment. It is a longitudinal cross-sectional view of the cap of the introducer for medical devices which concerns on this embodiment. It is a longitudinal cross-sectional view of the valve body of the introducer for medical devices which concerns on this embodiment.

  Hereinafter, an introducer for a medical instrument according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the examples shown below, and various modifications can be made without departing from the technical idea of the present invention.

  The outline | summary of the introducer 1 for medical devices which concerns on this embodiment incorporating the dilator 5 is shown by FIG. The introducer 1 of the present embodiment can be used by connecting to a medical device using a long medical instrument such as a catheter or a long member such as a guide wire in addition to the dilator 5, for example.

  When the introducer 1 of this embodiment is used in combination with the dilator 5, more specifically, the sheath 50 of the dilator 5 is attached to the distal end portion of the base portion 20 of the introducer body 2, and the guide wire 51 of the dilator 5 is used. Is inserted into the base portion 20 of the introducer body 2 and the energization wire 52 of the dilator 5 is inserted into the branch portion 21 of the introducer body 2 so that the distal end portion of the dilator 5 is appropriately and easily guided to the treatment section of the patient. be able to. Moreover, the introducer 1 of this embodiment has the 2nd branch part 22 toward the direction substantially orthogonal with respect to the base 20 of the introducer main body 2, and supplies a contrast agent (liquid) mainly. Used for.

  The guide wire 51 and the conducting wire 52 can be made of a metal material such as stainless steel. Further, in the present specification, the “tip portion” and “tip side” of the introducer 1, the introducer body 2 and the introducer base 20 are, for example, end portions on the side connecting the sheath 50 of the dilator 5 (FIG. 1). On the other hand, “rear end portion” and “rear end portion side” are ends opposite to the front end portion. For example, the guide wire 51 is introduced into the introducer. It means the end of the main body 2 on the side to be inserted into the base body 20 (right side in FIG. 1).

  2 shows a longitudinal section of the introducer 1 and the dilator 5 for the medical instrument according to the present embodiment shown in FIG. 1, and FIG. 3 shows a longitudinal section of the introducer body 2 according to the present embodiment. FIG. 4 shows a longitudinal section of the cap 3 of the medical device introducer 1 according to this embodiment, and FIG. 5 shows a hollow portion 24 ( A longitudinal section of the valve body 4 incorporated in the enlarged diameter part 242) is shown.

  As will be understood with reference to FIGS. 2 and 3, the introducer body 2 of the present embodiment includes a tubular base portion 20 having a hollow portion 24 therein and a conducting wire 52 in order to insert the guide wire 51. In order to be inserted, a tubular branch portion 21 that communicates with the hollow portion 24 of the base portion 20 and is inclined toward the rear end portion with respect to the base portion 20, and a base portion 20 for supplying a contrast medium and the like. And a tubular second branch portion 22 provided so as to communicate with the hollow portion 24 and to be substantially orthogonal to the base portion 20. The introducer body 2 is attached to the outside of the base portion 20 so as to be able to advance and retract. The introducer body 2 includes a cylindrical cap 3 having a bottom portion 31 and a guide wire 51 for fixing the guide wire 51 in a liquid-tight manner. The cylindrical valve body 4 (FIG. 2) installed in the hollow part 24 is provided.

  Each of the branch portion 21 and the second branch portion 22 branched from the middle of the base portion 20 of the introducer body 2 has a tubular shape and communicates with the hollow portion 24 of the base portion 20 (FIG. 3). The branch portion 21 is mainly used for inserting the energizing wire 52 of the dilator 5 and the like, but can also be used for supplying a fluid such as a chemical solution. The second branch 22 is used exclusively to supply a fluid such as a contrast medium.

  In particular, since the branch portion 21 is provided so as to be inclined toward the rear end side with respect to the base portion 20, the dilator is moved from the branch portion 21 through the hollow portion 24 of the base portion 20 toward the distal end of the introducer body 2. 5 can be guided smoothly, and even when a fluid such as a chemical solution is supplied, the fluid flows smoothly, so that it can be reliably supplied to a dilator, a catheter, or the like.

  A male screw portion 23 is formed on the outer peripheral portion 200 of the base portion 20 of the introducer body 2, and a hollow portion 24 penetrating from the front end portion to the rear end portion in the longitudinal direction of the base portion 20 is formed inside the base portion 20. Is provided. Further, the hollow portion 24 is formed with a stepped portion 241 having an abrupt change in inner diameter, and with the stepped portion 241 as a boundary, a reduced diameter portion 240 on the front end side and an enlarged diameter portion 242 on the rear end side. Are connected.

  As shown in FIG. 2, the valve body 4 is accommodated in the enlarged diameter portion 242 in a state in which one end surface thereof is in contact with the stepped portion 241. When the step portion 241 is provided in the hollow portion 24 as described above, the valve body 4 is brought into contact with the step portion 241 to be accurately and easily accommodated and fixed at a predetermined position in the enlarged diameter portion 242. Can do. Further, the stepped portion 241 in the hollow portion 24 strongly supports the valve body 4 pressed by the insertion portion 33 inside the cap 3 from the opposite side by tightening the cap 3, so that the valve body 4 is pressed. Since the movement in the direction is prevented, elastic deformation of the valve body 4 by the insertion portion 33 is promoted, and the valve body 4 safely and reliably seals and fixes a long member such as the guide wire 51 of the dilator 5.

  As can be understood with reference to FIGS. 2 and 4, the cap 3 includes a cylindrical cap body 30 having a bottom portion 31, and an inner peripheral portion 300 of the cap body 30 has a base 20 of the introducer body 2. A female screw portion 32 that is screwed into the male screw portion 23 is formed. By screwing together the screw portions of the base 20 of the cap main body 30 and the introducer main body 2, the cap 3 can be rotated, whereby the introducer main body 2 can be screwed back and forth along its longitudinal direction.

  A tubular insertion portion 33 extending outward is provided at the bottom 31 of the cap 3, and a central portion of the insertion portion 33 is rearward from the distal end portion for inserting a guide wire of the dilator 5 and the like. An introduction hole 34 penetrating to the end is formed. The insertion portion 33 is inserted into the hollow portion 24 (the enlarged diameter portion 242) of the base portion 20 of the introducer body 2 (FIG. 2), and when the cap 3 is rotated in the circumferential direction of the base portion 20, the insertion portion 33 is at the tip. The valve body 4 is approached from the side, and finally the valve body 4 is pressed and the valve body 4 is elastically deformed.

  On the bottom portion 31 side of the tubular insertion portion 33 extending from the bottom portion 31 of the cap 3 toward the distal end portion, the outer diameter is larger than the inner diameter of the hollow portion 24 (expanded portion 242) of the base portion 20 of the introducer body 2. A lock portion 35 is formed. Although not shown, on the bottom 31 side of the cap body 30, a second inner diameter of the cap body 30 is smaller than the outer diameter of the outer peripheral portion 200 of the base 20 of the introducer body 2. A lock part may be formed.

  The lock part 35 provided in the insertion part 33 of the cap 3 has an outer diameter that is the same as the inner diameter of the hollow part 24 of the base part 20 of the introducer body 2 or is continuously expanded from the insertion part 33 smaller than that. It connects to the lock | rock part 35 which has an outer diameter larger than the internal diameter of the hollow part 24 of the base 33 via the taper part which has the outer peripheral surface to do. For this reason, even if the outer diameter of the lock portion 35 of the insertion portion 33 is larger than the inner diameter of the hollow portion 24 of the base portion 2, the cap 3 is tightened (screwed) with respect to the base portion 20 of the introducer body 2. The outer circumferential surface of the lock portion 35 can be made to run on or bite into the inner circumferential surface of the hollow portion 24 while being slightly elastically deformed to be brought into strong contact with the inner circumferential surface of the hollow portion 24.

  Thus, the introducer 1 of the present embodiment is provided with a unique locking mechanism (locking portion 35) in the insertion portion 33 of the cap 3, so that the cap 3 is fastened to the base portion 20 of the introducer body 2. When (screwed), the lock portion 35 of the insertion portion 33 of the cap 2 strongly contacts or engages with the inner peripheral surface of the hollow portion 24 of the base portion 20 of the introducer main body 2 to ensure the cap 3 is loosened. Can be prevented.

  In particular, the lock portion 35 of the cap 3 of the present embodiment contacts or engages only at the rear end portion of the base portion 20 of the introducer body 2, so that the cap 3 is tightened (screwed) in the middle. The cap 3 is surely prevented from loosening without causing a force that prevents the rotation of the cap 3 and can be smoothly tightened (screwed).

  In order to be able to fasten the cap 3 to the base portion 20 of the introducer body 2 quickly with a small number of rotations, the lead amount of the thread portion of the base portion 20 of the introducer body 2 and the cap 3 is increased, and the pitch is increased. In this case, of the reaction force received from the elastically deformed valve body 4, the force of the horizontal component acting in the direction of loosening the cap 3 is increased. 3 cannot be prevented.

  However, the locking mechanism (locking portion 35) of the cap 3 of this embodiment is provided separately from the introducer body 2 and the screw portions 23 and 32 provided on the cap 3, and the base portion of the introducer body 2 is provided. Since only the rear end portion of the hollow portion 24 of the 20 contacts or engages strongly, the cap 3 is firmly fixed to the introducer body 2 when tightening is completed without being affected by the lead amount or pitch of the thread. Then, the insertion hole 40 of the valve body 4 itself can be liquid-tightly closed by elastic deformation of the valve body 4, or a long member such as the guide wire 51 used for the dilator 5 or the like can be sealed and fixed safely and securely. it can.

  The material of the introducer body 2 and the cap 3 is not particularly limited. For example, polyvinyl chloride, polyethylene, polypropylene, cyclic polyolefin, polystyrene, polycarbonate, acrylic resin, acrylonitrile-butadiene-styrene copolymer, polyethylene Various resins such as polyesters such as terephthalate and polyethylene naphthalate, butadiene-styrene copolymers, and polyamides can be used.

  The introducer 1 of the present embodiment has a base side engaging portion 25 (FIG. 3) formed on the outer peripheral portion 200 of the base portion 20 of the introducer body 2 in the circumferential direction and adjacent to the terminal end side of the male screw portion 23. The cap-side engagement portion 36 (which is formed adjacent to the start end side of the female screw portion 32 and engages with the base-side engagement portion 25 is formed on the inner peripheral portion 300 of the cap main body 30. 4).

  More specifically, the base side engaging portion 25 provided on the base portion 20 of the introducer body 2 is formed in the outer peripheral portion 200 of the base portion 20 in the circumferential direction and adjacent to the terminal end side of the male screw portion 23. On the other hand, the cap-side engagement portion 36 provided on the cap body 30 is formed on the inner peripheral portion 300 of the cap body 30 with respect to the convex portion 25 swelled outward in the radial direction. It is composed of a protrusion 36 that is formed adjacent to the start end side and engages with the protrusion 25 of the base 20 of the introducer body 2 and protrudes toward the radial center. The projecting portion 25 bulging outward in the radial direction and the projecting portion 36 engaging with the projecting portion 25 and projecting toward the center in the radial direction have a simple structure and high reliability of engagement and fitting. Suitable for preventing the cap 3 from coming off.

  In the specification of the present application, the “end side of the male screw portion 23” formed on the outer peripheral portion 200 of the base portion 20 of the introducer body 2 is the side where the screwing with the female screw portion 32 of the cap body 30 ends. On the other hand, the “starting end side of the female screw portion 32” formed on the inner peripheral portion 300 of the cap main body 30 is the male screw portion 23 of the introducer main body 2. Is the side (left side in FIG. 4) where the screwing starts.

  Moreover, in the introducer 1 of this embodiment, when it has the above-mentioned base side engaging part (convex part) 25 and cap side engaging part (protruding part) 36, the internal thread part 32 of the cap main body 30 is The cap side engaging portion (projecting portion) 36 is arranged so as to be screwed with the male screw portion 23 of the base portion 20 on the distal end side of the base portion 20 relative to the position where the cap side engaging portion (projecting portion) 25 is engaged. Has been.

  As described above, in the introducer 1 of the present embodiment, when the cap 3 is moved forward with respect to the base portion 20 of the introducer body 2, the base side engagement portion (convex portion) 25 and the cap side engagement are obtained. Since the engagement (position) of the portion (projection) 36 is arranged so as to come before (become front) the screwing (position) of the base 20 of the introducer body 2 and the cap body 30, the cap Even when the screwing of 3 is disengaged from the base portion 20 of the introducer body 2, the movement of the cap 3 toward the rear end portion of the base portion 20 (movement in the direction in which the cap 3 falls off the base portion 20) is restricted. . For this reason, in this embodiment, even after the cap 3 is loosened, the cap 3 will not accidentally fall out of the base 20 of the introducer body 2.

  As shown in FIGS. 2 and 4, the valve body 4 used in the present embodiment has a cylindrical shape as a whole (outer shape) and is made of silicone rubber or a soft resin material. . Further, the valve body 4 has an insertion hole 40 at the center thereof, and the insertion hole 40 is a fine hole provided so as to penetrate from the front end surface 41 to the rear end surface 42.

  The insertion hole 40 has a circular shape in plan view, and is substantially equal to or slightly equal to the outer diameter of the guide wire 51 of the dilator 5 in a no-load state (a state where the insertion hole 33 is not pressed by the insertion portion 33 of the cap 3). Has a larger inner diameter. For this reason, a long member such as the guide wire 51 can be smoothly and easily inserted into the insertion hole 40 of the valve body 4.

  Further, the valve body 4 has an outer diameter that is substantially equal to or slightly smaller than the inner diameter of the hollow portion 24 (expanded diameter portion 242) of the base portion 20 of the introducer body 2 in an unloaded state (see FIG. 2). For this reason, when the valve body 4 is installed in the hollow portion 24 (the enlarged diameter portion 242) of the introducer body 2, the valve body 4 can be prevented from being inadvertently elastically deformed.

  As described above, when the cap 3 is rotated and tightened, the insertion portion 33 of the cap 3 presses the valve body 4 from the rear end face 42 side. By this pressing action, the valve body 4 is elastically deformed so as to expand its outer diameter, but the outer peripheral surface 43 of the valve body 4 is regulated by the inner peripheral surface of the hollow portion 24 (expanded diameter portion 242). Can not be expanded. For this reason, since the valve body 4 is deformed so as to reduce the inner diameter of the insertion hole 40, the insertion hole 40 of the valve body 4 itself is closed in a liquid-tight manner or inserted into the insertion hole 40. The long member such as the guide wire 51 is pressed (compressed) by the inner peripheral surface of the insertion hole 40 so that the long member such as the guide wire 51 can be securely tightened.

  In addition, in the state where the long member such as the guide wire 51 is tightened by the inner peripheral surface of the insertion hole 40 as described above, the inner peripheral surface of the insertion hole 40 and the surface of the long member such as the guide wire 51 (outer peripheral surface). ), The fluid in the introducer body 2 is reliably prevented from leaking through the insertion hole 40 of the valve body 4.

  Further, in the state where the long member such as the guide wire 51 is tightened by the inner peripheral surface of the insertion hole 40, the long member such as the guide wire 51 may be moved along the longitudinal direction. The inner peripheral surface of the hole 40 also functions as a sliding member that slides on the surface (outer peripheral surface) of a long member such as the guide wire 51. Thereby, even if a long member such as the guide wire 51 is moved with respect to the valve body 4, the liquid tightness between the inner peripheral surface of the insertion hole 40 and the surface (outer peripheral surface) of the long member such as the guide wire 51. Therefore, the fluid in the introducer body 2 is reliably prevented from leaking through the insertion hole 40 of the valve body 4.

  On the other hand, when the cap 3 is rotated in the direction opposite to the tightening direction, the pressing of the cap insertion portion 33 against the valve body 4 is released, so that the inner diameter of the insertion hole 40 is unloaded (the insertion portion 33 of the cap 3). , And the fastening of the long member such as the guide wire 51 is released. Thus, by making the inner diameter of the insertion hole 40 of the valve body 4 elastically deformable by an external stress, it is possible to appropriately set the tightening force of the valve body 4 on a long member such as the guide wire 51.

DESCRIPTION OF SYMBOLS 1 ... Medical device introducer 2 ... Introducer main body 20 ... Base 200 ... Outer peripheral part 21 ... Branch part 22 ... Second branch part 23 ··· Male screw portion 24 ··· Hollow portion 240 · Reduced diameter portion 241 ··· Step portion 242 · · · Diameter expanded portion 25 ··· Convex portion (base side engaging portion)
3... Cap 30... Cap body 300... Inner peripheral portion 31... Bottom portion 32. .... Lock part 36 ... Projection part (cap side engagement part)
4... Valve body 40... Insertion hole 41... Front end surface 42... Rear end surface 43 ... Peripheral surface 5 ... Dilator 50 ... Sheath 51 .... Guide wire 52 ... Electric wire

Claims (10)

An introducer body having a tubular base for inserting a guide wire,
A male screw portion is formed on the outer peripheral portion of the base portion,
Inside the base portion, a hollow portion is formed to penetrate from the front end portion to the rear end portion, the introducer body, and
In order to fix the guide wire in a liquid-tight manner, a cylindrical valve body disposed in a hollow portion of the introducer body, a cylindrical cap body having a bottom, and the inside of the cap body A cap having a tubular insertion portion extending outward from the bottom,
On the inner peripheral part of the cap body, a female thread part that is screwed with a male thread part of the base part of the introducer body is formed.
An introducer for a medical instrument comprising the cap, wherein a lock portion having an outer diameter larger than an inner diameter of a hollow portion of a base portion of the introducer body is formed on a bottom side of the insertion portion. A base side engaging portion is formed on the outer peripheral portion of the base portion of the introducer main body in the circumferential direction and adjacent to the terminal end side of the male screw portion, and the inner peripheral portion of the cap main body, The introducer for a medical instrument according to claim 1, wherein a cap side engaging portion that engages with the base side engaging portion is formed adjacent to a starting end side of the female screw portion.   The female screw portion of the cap main body is screwed into the male screw portion of the base portion on the distal end side of the base portion with respect to a position where the cap side engaging portion engages with the base side engaging portion. Or the introducer for medical devices of 2. The base-side engaging portion is a convex portion or a radially inward inwardly formed on the outer peripheral portion of the base portion in the circumferential direction and adjacent to the terminal end side of the male screw portion. The cap-side engaging portion engages with the convex portion or the concave portion formed adjacent to the start end side of the female screw portion in the inner peripheral portion of the cap main body. The introducer for a medical device according to claim 2 or 3, wherein the introducer is a protruding portion protruding toward the center in the radial direction.   5. The second lock portion according to claim 1, wherein a second lock portion having an inner diameter smaller than an outer diameter of an outer peripheral portion of a base portion of the introducer main body is formed on a bottom portion side of the cap main body. Introducer for medical equipment.   The introducer main body further includes a tubular branch portion that is connected to the hollow portion of the base portion and is inclined toward the rear end side with respect to the base portion in order to insert a conducting wire or introduce fluid. The introducer for a medical instrument according to any one of claims 1 to 5.   2. The introducer body further includes a tubular second branch portion that communicates with a hollow portion of the base portion and is substantially orthogonal to the base portion for introducing a fluid. 7. The medical device introducer according to any one of items 6 to 6.   The hollow portion of the base portion of the introducer body is formed on the rear end portion side of the base portion by connecting to the reduced diameter portion via a stepped portion and a reduced diameter portion formed on the tip portion side of the base portion. The introducer for a medical device according to any one of claims 1 to 7, further comprising an enlarged diameter portion.   The valve body is accommodated in the enlarged diameter portion with one end abutting against the step portion of the hollow portion of the introducer body, and the distal end portion of the insertion portion of the cap is the cap The medical instrument introducer according to claim 8, wherein when the screw is screwed, the other end of the valve body comes into contact with and presses the other end.   A dilator and a catheter provided with the introducer for a medical instrument according to any one of claims 1 to 9.

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