JP6089638B2 - Indwelling needle assembly - Google Patents

Description

  The present invention relates to an indwelling needle assembly that is punctured and placed in a blood vessel during artificial dialysis, infusion or blood collection.

  When a practitioner performs artificial dialysis, infusion, blood collection, or the like on a patient, an indwelling needle assembly is used. As the indwelling needle assembly, for example, there is an indwelling needle assembly as in Patent Document 1. .

  The indwelling needle assembly of Patent Document 1 has a cylindrical outer needle hub, and a tube-shaped outer needle is fixed to a distal end portion of the outer needle hub. An inner needle having a sharp needle tip is inserted through the outer needle. The proximal end side of the inner needle protrudes from the outer needle into the outer needle hub, and the inner needle hub is attached to the proximal end portion of the inner needle. The inner needle hub is detachably attached to the opening on the proximal end side of the outer needle hub, and the inner needle can be pulled out from the outer needle and the outer needle hub by pulling out the inner needle hub. .

A protector is provided in the outer needle hub to cover the needle tip of the inner needle. Protector has a protector body that can be opened and closed configuration, protector body is provided in the outer needle hub in a state of open. The inner needle passes through the open protector and has an engaging portion in the vicinity of the tip portion of the inner needle. Engagement portion, the needle tip is pulled out of the inner needle from the outer needle is adapted to engage the protector body when accommodated in the protector body. Further, the protector body, acting ring that is engaged to the outer needle hub and is exterior protector body closes the protector body when moved relative to the base end side of the outer needle hub to the working ring It is configured as follows.

Thus, in the indwelling needle assembly is composed, are brought inner needle into the inner needle protector body is pulled out from the outer needle, the protector body moves relative to the working ring. By doing so, the protector body is closed by the action ring, and the tip of the inner needle is covered and protected by the protector body. Further withdrawal of the inner needle, engages the action ring protector body, acting ring is taken to protector body is out of the outer needle hub.

JP 2010-88522 A

In the indwelling needle assembly of Patent Document 1, when the working ring is detached from the outer needle hub before the protector body is closed, the inner needle is removed from the outer needle hub in a state where the needle tip of the inner needle is not protected. Therefore, effects ring when withdrawing the inner needle in order to firmly engaged so as not easily escape from the outer needle hub, acting ring and the outer needle hub is required high machining accuracy. Further, if the outer ring hub is firmly engaged so that the working ring cannot be easily removed, a large force is required to remove the working ring from the outer needle hub.

  Therefore, an object of the present invention is to provide an indwelling needle assembly that does not require high processing accuracy and can smoothly remove the protector from the outer needle hub.

  An indwelling needle assembly of the present invention includes an inner needle having a sharp needle tip at a distal end portion, an inner needle hub provided on a proximal end portion side of the inner needle, and a hollow through which the inner needle is inserted. An outer needle, an outer needle hub through which the inner needle is inserted and an inner space having an outer needle insertion port and a hub insertion port is formed, and the outer needle insertion port and the hub provided in the inner space A sealing member that seals between the insertion opening, a protector that can be opened and closed, and a protector that is provided on the hub insertion opening side from the sealing member in the internal space; and A closing mechanism disposed closer to the hub insertion port than the protector of the protector, wherein the outer needle insertion port is provided with a base end portion of the outer needle, and the hub insertion port includes the inner needle. A hub is detachably attached, and the protector is moved forward so that the inner needle penetrates. When the protective portion is opened and disposed in the internal space, and the distal end portion of the inner needle is pulled out toward the hub insertion port in a state where the distal end portion of the inner needle is accommodated in the protective portion, the inner needle It is configured to move toward the hub insertion port along with the tip, and the closing mechanism is configured to close the protection unit of the protector moving toward the hub insertion port, and the protection It is fixed to the outer needle hub so that it is located in the internal space even after the part is closed, and the protection part is configured not to open unless an external force acts when closed by the closing mechanism. It is.

  According to the present invention, the closing mechanism for closing the protector of the protector is fixed to the outer needle hub, and the protector of the protector can be kept closed even after being pulled out. Therefore, it is not necessary to adjust the engagement force between the closing mechanism and the outer needle hub, and high machining accuracy is not required. Further, it is not necessary to remove the closing mechanism from the outer needle hub, and the protector can be smoothly removed from the outer needle hub while protecting the tip portion of the inner needle.

  According to the present invention, high processing accuracy is not required, and the protector can be smoothly removed from the outer needle hub.

It is a front view which shows the indwelling needle assembly of 1st Embodiment of this invention. It is an expanded sectional view which expands and shows the indwelling needle assembly of FIG. FIG. 3 is an enlarged sectional view showing a region X1 of the indwelling needle assembly of FIG. 2 in an enlarged manner. In the indwelling needle assembly, it is sectional drawing which shows the state which extracted the inner needle from the outer needle hub. It is an expanded sectional view which expands and shows the area | region X2 of the indwelling needle assembly of FIG. It is an expanded sectional view showing the indwelling needle assembly of a 2nd embodiment of the present invention.

  Hereinafter, indwelling needle assemblies 1 and 1A according to embodiments of the present invention will be described with reference to the drawings. In addition, the concept of the direction used in the following description is used for convenience in description, and does not limit the direction of the configuration of the invention in that direction. Indwelling needle assemblies 1 and 1A described below are only one embodiment of the present invention. Therefore, the present invention is not limited to the embodiments, and additions, deletions, and changes can be made without departing from the spirit of the invention.

[First Embodiment]
<Indwelling needle assembly>
An indwelling needle assembly 1 shown in FIG. 1 is used when a needle is punctured and placed in a blood vessel or the like, and a drug solution is administered into the blood vessel by the needle or blood is collected from the blood vessel. The indwelling needle assembly 1 includes an indwelling needle main body 2, and the indwelling needle main body 2 is formed along the axis L1. In the following description, a distal portion is referred to as a distal end portion with respect to a practitioner who punctures a patient with the indwelling needle assembly 1, and a proximal portion of the practitioner is referred to as a proximal end portion. ing. The axial direction means a direction along the axis L1 of the indwelling needle body 2.

<Indwelling needle body>
As shown in FIG. 2, the indwelling needle body 2 includes an inner needle 11, an inner needle hub 12, an outer needle 13, and an outer needle hub 14. The inner needle 11 is a generally cylindrical hollow needle made of, for example, a metal material or hard synthetic resin, and extends straight along the axis L2 (substantially coincides with the axis L1). The inner needle 11 has a sharp needle tip 11a formed so as to be able to puncture a blood vessel at a distal end portion, and an inner needle hub 12 is provided at a proximal end portion.

  The inner needle hub 12 has a cap part 21 and a grip part 22, and the cap part 21 is a substantially bottomed cylindrical part made of synthetic resin, for example. The inner needle 11 is inserted and fixed at the tip of the cap portion 21. The cap portion 21 has a proximal end portion with a larger diameter than the distal end portion, and a grip portion 22 is integrally provided on a portion of the cap portion 21 on the proximal end portion side. The grasping portion 22 is configured so that a practitioner such as a doctor or a nurse can grasp by hand. The assembly of the inner needle 11 and the inner needle hub 12 configured as described above is inserted into the outer needle 13 and the outer needle hub 14.

  The outer needle 13 is a substantially cylindrical thin tube made of a synthetic resin having flexibility. The outer needle 13 is formed shorter than the inner needle 11, and the needle tip 11 a of the inner needle 11 projects from the tip of the outer needle 13. An outer needle hub 14 is provided at the proximal end portion of the outer needle 13.

  The outer needle hub 14 is a Y-shaped member made of a synthetic resin having translucency, and has a hub body 24 and a tube coupling portion 25. The hub main body 24 is formed in a substantially cylindrical shape, and is formed in a taper shape that tapers as the outer peripheral surface of the tip portion moves toward the tip. The inner hole 24a of the hub body 24 extends along its axis (substantially coincides with the axes L1 and L2). The hub main body 24 has an outer needle insertion port 24b on the distal end side, and a hub insertion port 24c on the proximal end side. The proximal end portion of the outer needle 13 is inserted and fixed in the outer needle insertion port 24b, and the distal end portion of the inner needle hub 12 is fitted in the hub insertion port 24c. The hub insertion port 24 c is closed by the proximal end portion of the inner needle hub 12 by fitting the inner needle hub 12. 2 and 3, the gap between the cap portion 21 and the hub body 24 is exaggerated for easy understanding of the configuration. Further, a tube coupling portion 25 is provided on the outer peripheral surface of the hub main body 24 so as to branch from the hub main body 24, from which an infusion such as blood or a chemical solution is transported.

  The tube coupling portion 25 is formed in a substantially cylindrical shape, and one end thereof is integrally provided on the outer peripheral surface of the hub body 24. The tube coupling portion 25 extends obliquely from the outer peripheral surface of the hub main body 24 toward the proximal end side of the hub main body 24 and away from the outer peripheral surface of the hub main body 24 in the radial direction. A communication port 25b is formed on one end side of the tube coupling portion 25, and the inner hole 25a of the tube coupling portion 25 is connected to the inner hole 24a of the hub main body 24 via the communication port 25b. Moreover, the tubular tube 26 which has flexibility is fixed to the other end part of the tube coupling part 25, and the transport port 25c is formed. The inner hole 25 a is connected to the inside of the tube 26 through the transport port 25 c, and the tube 26 is connected to the connector 27.

  As shown in FIG. 1, the connector 27 is formed in a Y shape, and a communication port is formed at each end. One communication port is closed by a cap member 28, and the remaining two communication ports are provided with a tube 26 and an injection plug 29, respectively.

  When infusion and blood collection are performed using the indwelling needle main body 2 configured in this way, the operator first punctures a blood vessel or the like with the outer needle 13 through which the inner needle 11 is inserted. Thereby, the inside of the blood vessel and the inside of the outer needle hub 14 are conducted, and a flashback in which blood in the blood vessel flows into the outer needle hub 14 occurs. After confirming this flashback, the inner needle 11 is removed from the outer needle 13 and the outer needle hub 14. At this time, a hemostatic rubber 3 is provided in the inner hole 14a of the outer needle hub 14 in order to prevent blood (or a chemical solution) from leaking from the hub insertion port 24c.

<Hemostatic rubber>
The hemostatic rubber 3 shown in FIG. 2 is a solid substantially cylindrical member made of synthetic rubber or thermoplastic elastomer, and has elasticity. The hemostatic rubber 3 that is a sealing member is fitted in the intermediate portion in the axial direction of the inner hole 24 a of the hub body 24. More specifically, the hemostatic rubber 3 is located in the inner hole 24a on the hub insertion port 24c side from the communication port 25b of the tube coupling portion 25 and on the outer needle insertion port 24b side from the protector 4 described later. Thereby, the inner hole 24a which is an internal space is divided into a liquid space 31 connected to the inside of the outer needle 13 and the tube 26 and a protector accommodating space 32 connected to the hub insertion port 24c, and the space between the two spaces 31, 32 is separated. Sealed with a hemostatic rubber 3.

  The hemostasis rubber 3 arranged in this way has an inner needle 11 extending along the axial center thereof. Since the hemostasis rubber 3 has elasticity, it is pressed against the outer peripheral surface of the inner needle 11. It is in close contact. Thereby, the space between the hemostasis rubber 3 and the inner needle 11 is sealed, and even when the inner needle 11 is moved in the axial direction, the state where the hemostasis rubber 3 and the inner needle 11 are sealed is maintained. It has become. Further, when the inner needle 11 is removed from the hemostatic rubber 3, the hemostatic rubber 3 is elastically restored so as to block the through hole 30 through which the inner needle 11 has passed. It is designed to seal between the two. As described above, the hemostatic rubber 3 can seal the space between the liquid space 31 and the protector accommodating space 32 regardless of whether the inner needle 11 penetrates, and prevent the infusion from leaking into the protector accommodating space 32. The protector 4 is accommodated in the protector accommodating space 32 thus separated from the liquid space 31.

<Needle protector>
The protector 4 is made of a metal material, and is configured to cover and protect the needle tip 11a of the inner needle 11 when the inner needle 11 is pulled out from the outer needle 13 and the outer needle hub 14 and taken out. The protector 4 is a metal single body formed by bending and deforming a thin plate, and is formed in a substantially quadrangular prism-like box-like member extending in the axial direction. Below, the structure of the protector 4 is demonstrated still in detail, referring FIG.

  The protector 4 has a substantially square bottom plate 42 and a ceiling plate 43. The bottom plate 42 and the ceiling plate 43 are separated from each other in the axial direction, and are arranged so as to face each other and overlap in plan view. The bottom plate 42 is integrally provided with a pair of flexible side plates 44 and 45 at two opposing edge portions of each of the four edge portions. The pair of flexible side plates 44 and 45 are generally rectangular plate members and are disposed so as to face each other.

  More specifically, the pair of flexible side plates 44 and 45 are directed from the bottom plate 42 to the ceiling plate 43 and further extend beyond the ceiling plate 43, and are bent portions 44 a and 45 a at intermediate portions in the longitudinal direction. It is bent. The portions on the proximal end side from the bent portions 44a and 45a form fixing portions 44b and 45b, and the portions on the distal end side form flexible portions 44c and 45c. The fixing portions 44b and 45b are arranged at a right angle to the bottom plate 42, and flexible portions 44c and 45c are integrally formed at the tips thereof. The flexible portions 44c and 45c extend so as to spread outward with respect to the fixed portions 44b and 45b, and can be pushed into the protector 4 with the bent portions 44a and 45a as a base point. .

  In addition, fixing plates 51 are integrally provided at both ends in the width direction of one fixing portion 44b, and fixed side plates 52 are integrally provided at both ends in the width direction of the other fixing portion 45b. . The pair of fixed plates 51 are bent at right angles to the fixed portion 44 b and extend toward the other flexible side plate 45. Further, the pair of fixed side plates 52 are formed in a substantially rectangular shape, and are bent at a right angle with respect to the fixed portion 45b. The distal ends of the pair of fixed side plates 52 extend to the ceiling plate 43, and either one of the pair of fixed side plates 52 is connected to one edge of the ceiling plate 43. The pair of fixed side plates 52 configured as described above are joined to the fixed plate 51 so as to overlap with each other, and together with the pair of flexible side plates 44 and 45, form a lower body 41 of the protector 4 having a substantially rectangular parallelepiped shape. .

Inner needle insertion holes 42a and 43a are formed in the center of the bottom plate 42 and the ceiling plate 43 of the protector 4 configured as described above. The two inner needle insertion holes 42a and 43a overlap each other in plan view (that is, viewed in the axial direction from the proximal end side of the inner needle 11), and are the first inner needles serving as the inner needle insertion holes 42a of the bottom plate 42. The insertion hole 42 a is formed with a smaller diameter than the second inner needle insertion hole 43 a which is the inner needle insertion hole 43 a of the ceiling plate 43. The inner needle 11 is inserted into the two inner needle insertion holes 42a and 43a, and an engaging portion 11b bulging radially outward is formed in the vicinity of the needle tip 11a on the outer peripheral portion of the inner needle 11. Yes. The outer dimension of the engaging portion 11b of the inner needle 11 is larger than the outer dimension of the first inner needle insertion hole 42a and smaller than the outer dimension of the second inner needle insertion hole 43a. Accordingly, when the inner needle 11 is pulled out, the engaging portion 11b passes through the second inner needle insertion hole 43a and engages with the bottom plate 42. A protector 40 is provided on the lower body 41 of the protector 4 to protect the needle tip 11 a of the inner needle 11 engaged with the bottom plate 42.

  The protection unit 40 includes a pair of protection plates 46 and 47, and the pair of protection plates 46 and 47 are formed integrally with the distal ends of the pair of flexible side plates 44 and 45. Each of the protection plates 46 and 47 is a plate member formed in a generally J shape, and extends from the tip of the flexible side plates 44 and 45 so as to incline toward the other flexible side plates 45 and 44. The pair of protective plates 46 and 47 extending in this way are arranged in the protector accommodating space 32 in a state of being separated from each other, and a gap 53 is formed between them. The inner needle 11 is inserted into the gap 53.

  Further, the pair of protection plates 46 and 47 come close to each other by pushing the flexible portions 44 c and 45 c of the flexible side plates 44 and 45 inward, and one protection plate 46 is the other protection plate 47. It is formed long with respect to. Therefore, by bringing the pair of protection plates 46 and 47 close to each other, the tip portion of one protection plate 46 covers the tip portion of the other protection plate 47, thereby closing the protection portion 40 and leaving a gap. 53 can be blocked.

  Furthermore, the tip portions of the pair of protective plates 46 and 47 are bent at an acute angle to form flanges 46a and 47a. The flange 46a of one protective plate 46 engages with the tip of the protective plate 47 when the protective portion 40 is closed, and maintains the closed state so that the protective portion 40 does not open ( For example, refer to the two-dot chain line in FIG. 5). In the protection part 40 closed in this manner, a needle tip accommodation space 48 surrounded by two protection plates 46 and 47 and a ceiling plate 43 is formed as shown in FIG. The needle tip storage space 48 is a substantially triangular space at both front and rear ends. Closure plates 49 are provided at both ends in the width direction of one of the protective plates 46 and 47 to close both front and rear ends of the needle tip storage space 48. Each is provided. Thereby, the protection part 40 is protected so that the needle tip 11 a of the inner needle 11 is not exposed to the outside of the protector 4.

  The protector 4 configured as described above is pulled out from the protector housing space 32 by being pulled by the inner needle 11 by pulling out the inner needle 11 in a state where the engaging portion 11b of the inner needle 11 is engaged with the bottom plate 42. It is supposed to be. A ring member 60 as shown in FIG. 3 is provided in the outer needle hub 14 in order to close the protective portion 40 when the protector 4 is pulled out.

<Ring member>
The ring member 60 that is a closing mechanism is a substantially annular member made of synthetic resin, and an inner hole 60a thereof is formed in a substantially rectangular shape. More specifically, the inner hole 60a is substantially the same shape as the lower body 41 of the protector 4 in plan view and is slightly larger than the lower body 41 so that the entire protector 4 can be inserted therethrough. The ring member 60 having such a shape is provided in the protector accommodating space 32 so that the axis thereof substantially coincides with the axis of the outer needle hub 14, and is fixed to the outer needle hub 14 on the proximal side from the protector 4. Has been. In the present embodiment, the fixing groove 14b extending over the entire circumference in the circumferential direction is formed in the inner peripheral portion of the outer needle hub 14, and the ring member 60 is fixed by being fitted into the fixing groove 14b.

  Further, the outer needle hub 14 has a mounting opening 14c as shown in FIG. The mounting opening 14c is a horizontally long opening having a width that is substantially the same as the outer diameter of the ring member 60 and a width that is substantially the same as the thickness of the ring member 60 when viewed from the front. ing. Further, the mounting opening 14c is connected to the fixing groove 14b, and the ring member 60 can be inserted into the fixing groove 14b and fixed by inserting the ring member 60 from the mounting opening 14c.

  The inner needle 11 is inserted into the inner hole 60a of the ring member 60 configured as described above, and the protector 4 that moves to the proximal end side along with the inner needle 11 can pass therethrough. The ring member 60 is configured to push the flexible portions 44c and 45c of the protector 4 passing through the inner hole 60a inward. By pushing, the pair of protection plates 46 and 47 are moved in directions close to each other to protect the protection portion 40. Is supposed to close. Such a closing operation is completed before the protector 4 is entirely removed from the inner hole 60a, and the needle tip 11a of the inner needle 11 is covered with the protector 4 to be protected. Further, when the protective portion 40 is closed, the pair of protective plates 46 and 47 are engaged with each other, and the protected state is maintained.

<About functions of indwelling needle assembly>
Below, the usage method and function of the indwelling needle assembly 1 comprised as mentioned above are demonstrated. When the practitioner punctures the blood vessel with the needle tip 11a protruding from the tip of the outer needle 13 and confirms the flashback, the practitioner pulls out the inner needle 11 inserted through the outer needle 13 to start infusion or blood collection. Then, first, the needle tip 11 a of the inner needle 11 enters the outer needle 13, passes through the outer needle 13, reaches the hemostatic rubber 3 through the inner space of the outer needle hub 14. Thereafter, the needle tip 11a of the inner needle 11 escapes from the hemostatic rubber 3, and the part around the through-hole 30 is elastically restored to block the through-hole 30 and accordingly between the liquid space 31 and the protector accommodating space 32. Seal.

  Further, the needle tip 11 a of the inner needle 11 enters between the pair of protective plates 46 and 47 of the protector 4, and the engaging portion 11 b is engaged with the bottom plate 42 in due course. The protector 4 with which the engaging portion 11 b engages is moved to the proximal end side along with the inner needle 11 and is inserted into the ring member 60. When the inner needle 11 is further pulled out, the flexible portions 44 c and 45 c of the protector 4 hit the ring member 60, and the flexible portions 44 c and 45 c are pushed inward by the ring member 60. By doing so, the protection part 40 is closed and the needle tip 11a of the inner needle 11 is covered and protected by the protection part 40 (see FIGS. 4 and 5). At this time, the pair of protection plates 46 and 47 are engaged so that the protection part 40 is not opened unless an external force is applied, and the state in which the needle tip 11 a of the inner needle 11 is protected by the protection part 40 is maintained. Is done. This state continues even after the protection part 40 is removed from the ring member 60, and the inner needle 11 is taken out from the outer needle hub 14 in this state (see the two-dot chain line in FIG. 5). Then, the practitioner flows the drug solution or collects blood according to the set connected to the connector 27 in advance before the puncturing operation is performed.

  As described above, in the indwelling needle assembly 1, the protector 40 of the protector 4 that moves to the proximal end side along with the inner needle 11 is closed by the ring member 60 fixed to the outer needle hub 14, and the protector 4 is pulled. Even after being pulled out, the protection unit 40 itself can maintain the closed state by engaging the pair of protection plates 46 and 47 with each other. Thereby, it is not necessary to pull out the ring member 60 from the outer needle hub 14, and a large force for pulling out the ring member 60 from the outer needle hub 14 is not necessary. Thereby, the protector 4 can be smoothly extracted from the outer needle hub 14. Further, since the ring member 60 is fixed to the outer needle hub 14, it is not necessary to adjust the engagement force between the ring member 60 and the outer needle hub 14, and high processing accuracy is not required for the portion where they are fixed. .

  Further, even after the protector 4 is pulled out from the ring member 60, the needle tip 11 a can be continuously covered and protected by the protection unit 40, so that after the inner needle 11 is pulled out from the outer needle hub 14, the needle tip 11 a again becomes the protector 4. It sticks into the fingers of a third party such as a doctor, a nurse, or a needle discarder, and prevents blood from adhering to the needle tip 11a from causing a third party to develop an infection. be able to.

  Further, in the indwelling needle assembly 1, the protective part 40 can be closed only by passing the protector 4 through the ring member 60, so that a large sliding resistance is not generated in the protector 4 when the protective part 40 is closed. Therefore, the protector 4 can be taken out from the outer needle hub 14 together with the inner needle 11 without applying a large force. Moreover, since the protection part 40 can be closed only by letting the protector 4 pass through the ring member 60, high processing accuracy is not required for the ring member 60, and the indwelling needle assembly 1 can be easily manufactured. .

  Further, in the indwelling needle assembly 1, the ring member 60 is fixed in the outer needle hub 14 by inserting the ring member 60 from the mounting port 14 c formed on the outer peripheral surface of the outer needle hub 14. Therefore, the attachment of the ring member 60 is simple. In addition, since the mounting port 14c intersects the axial direction of the inner needle 11 (orthogonal in this embodiment), the inner needle 11 is fixed by inserting the ring member 60 from the mounting port 14c and fixing it to the outer needle hub 14. It is possible to prevent the ring member 60 from being removed together when it is pulled out, and the ring member 60 from being moved to the tip side by the protector 4. Thereby, the protection part 40 of the protector 4 can be closed reliably and the needle tip 11a of the inner needle 11 can be protected.

[Second Embodiment]
The indwelling needle assembly 1A of the second embodiment is similar in configuration to the indwelling needle assembly 1 of the first embodiment. In the following, regarding the configuration of the indwelling needle assembly 1A of the second embodiment, differences from the indwelling needle assembly 1 of the first embodiment will be mainly described, and the same components will be described with the same reference numerals. May be omitted .

  The indwelling needle assembly 1A of the second embodiment includes a ring member 60A as shown in FIG. The ring member 60A is a cylindrical member having a generally D-shaped cross section made of a synthetic resin, and includes a semi-cylindrical portion 60b and a rectangular parallelepiped portion 60c. The ring member 60 </ b> A is fixed in the outer needle hub 14 so that the semi-cylindrical portion 60 b abuts on the inner peripheral surface of the outer needle hub 14. The inner hole 60a of the ring member 60A arranged in this way is configured so that the protector 4 can be inserted therethrough, and the protector 40 is closed when the protector 4 passes therethrough. Further, in the ring member 60A, a part of the rectangular parallelepiped portion 60c protrudes from the mounting opening 14c of the outer needle hub 14, and the skin fixing portion 61 is fixed integrally therewith.

The skin fixing portion 61 is a substantially rectangular plate-like member extending in the front-rear direction (the front-rear direction in FIG. 6), and a rectangular parallelepiped portion 60c is integrally provided on one surface thereof. Skin fixing portion 61 is formed wider than the hub insertion hole 24c of the outer needle hub 14, its front and rear both end portions extending to the longitudinal direction outwardly of the hub body 24. Moreover, the lower surface of the skin fixing part 61 is flat, and the stability of the skin fixing part 61 on the mounting part is improved by increasing the contact area with the mounting part (for example, a patient's arm). Can be made.

  In addition, the indwelling needle assembly 1A has the same effects as the indwelling needle assembly 1 of the first embodiment.

[Other embodiments]
In the indwelling needle assemblies 1 and 1A of the first and second embodiments, the ring members 60 and 60A are inserted from the side surface of the outer needle hub 14, but the structure is such that they are inserted from the hub insertion port 24c. Also good. In that case, the inner peripheral portion of the outer needle hub 14 is formed in a tapered shape such that a portion on the distal end side from the ring member 60 and a proximal end side from the hemostatic rubber 3 is tapered toward the distal end. It is preferable to lock the ring member at the portion. The ring member 60 is fixed in the outer needle hub 14 by being pushed toward the locking portion, and the ring member 60 can be prevented from coming off together with the protector 4 when the protector 4 is removed.

The protector 4 is not limited to the above-described configuration, and may be any configuration that can cover the needle tip 11a of the inner needle 11. In that case, it is only necessary to have a structure that covers at least the space on the extension line of the needle tip 11 a of the inner needle 11, and it is not always necessary to cover the side of the needle tip 11 a like the protection plates 46 and 47 . Similarly, the ring members 60, 60 </ b> A are not limited to the above-described configuration, and may be configured to be able to close the protector 4 that moves to the base end side.

  The ring and the outer needle hub may be fixed by fitting, or may be fixed by a static friction force. For example, a part of the skin fixing part may be fitted and fixed to the mounting opening, or a concave or convex part may be provided in each of the ring and the outer needle hub, and the fixing method by fitting the concave part and the convex part May be adopted. The shape of the closing mechanism can be changed as appropriate. For example, the ring may be a cylindrical body having a quadrangular cross section. Furthermore, a cylindrical body having a C-shaped cross section may be employed so that the ring is bent when the ring is inserted into the outer needle hub. Moreover, the skin fixing | fixed part should just be a shape which can be fixed to skin by taping etc.

1,1 A Indwelling needle assembly 3 Hemostatic rubber
4 protector 11 inner needle 11a needle tip 12 inner needle hub 13 outer needle 1 4 outer needle hub 14a inner hole 40 protective part 60, 60A ring member

Claims (3)

An inner needle having a sharp needle tip at the tip,
An inner needle hub provided on the proximal end side of the inner needle;
A hollow outer needle through which the inner needle is inserted;
An outer needle hub through which the inner needle is inserted and an internal space having an outer needle insertion port and a hub insertion port is formed;
A sealing member that is provided in the internal space and seals between the outer needle insertion port and the hub insertion port;
A protector that can be opened and closed, and a protector provided on the hub insertion side from the sealing member in the internal space;
A closing mechanism disposed on the hub insertion side from the protector of the protector in the internal space,
The outer needle insertion port is provided with a proximal end portion of the outer needle,
The inner needle hub is detachably attached to the hub insertion port,
The protector is disposed in the internal space by opening the protective portion so that the inner needle penetrates, and the distal end portion of the inner needle is moved in the state where the distal end portion of the inner needle is accommodated in the protective portion. When it is pulled out toward the hub insertion port, it is configured to move toward the hub insertion port along with the tip of the inner needle,
The outer needle hub has a mounting opening communicating with the inner space on the outer surface,
The closing mechanism is configured to close the protection portion of the protector that moves toward the hub insertion port, and from the mounting port so as to be positioned in the internal space even after the protection portion is closed. Inserted and fixed to the outer needle hub,
The indwelling needle assembly is configured such that when the protection unit is closed by the closing mechanism, the protection unit is not opened unless an external force is applied. A plate-like skin fixing part formed wider than the width of the outer needle hub,
The closing mechanism and the skin fixing part are integrally formed,
The indwelling needle assembly according to claim 1 , wherein the skin fixing portion is disposed outside the outer needle hub. The closing mechanism is constituted by an annular member,
The protector is arranged to pass through the annular member when moving toward the hub insertion port,
The indwelling needle assembly according to claim 1 or 2 , wherein the annular member is configured to close a protective portion of the protector passing therethrough.

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