CN112546338A

CN112546338A - Indwelling needle

Info

Publication number: CN112546338A
Application number: CN201910919834.5A
Authority: CN
Inventors: 张鹏飞; 范云平; 钟炜; 王云蕾; 贺祥; 郭雅靖; 曾梅
Original assignee: Shanghai Microport Medical Group Co Ltd; Meizhou Peoples Hospital
Current assignee: Shanghai Weiwei Zhiling Medical Technology Co Ltd; Meizhou Peoples Hospital
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2021-03-26

Abstract

The invention provides an indwelling needle, which comprises an indwelling seat, a puncture needle component, a recovery component and a guide component, wherein the indwelling seat is provided with a first end and a second end which are communicated along a first axis; the puncture needle assembly comprises a puncture needle body and an indwelling sheath, the puncture needle body is movably arranged along a first axis, the indwelling sheath is provided with a through first inner cavity for the puncture needle body to penetrate through, one end of the indwelling sheath is fixedly connected with the first end of the indwelling seat, and the other end of the indwelling sheath is a free end; the puncture needle assembly is used for puncturing into a preset position; the recovery assembly is arranged at the second end of the retention seat and used for recovering and containing the puncture needle body; the guiding component is arranged at the second end of the indwelling seat and used for guiding the indwelling sheath to move at a preset position after the puncture needle body is recovered and accommodated by the recovery component. The configuration can avoid the problem that the indwelling sheath is bent and broken due to direct pushing of the indwelling sheath, effectively improves the success rate of puncture, and can obviously reduce the probability of nosocomial infection.

Description

Indwelling needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to an indwelling needle.

Background

In 1962, the first indwelling needle "Braun ü le" was invented by berland, germany. In the early 80 s, venous indwelling needles entered developed countries and regions of asia; in the 90 s, the open type indwelling needle firstly enters the operating room of China. The occurrence of the open type indwelling needle greatly reduces the pain of a patient caused by repeated puncture of a common steel needle, particularly in department of pediatrics and geriatrics, and is gradually popularized to other departments.

Due to the fragility of the human blood vessel, in the process of indwelling needle puncture, the puncture needle only serves as a simple puncture effect, after the puncture needle is punctured and withdrawn, the puncture needle is used as a hose of an indwelling sheath to enter the deep part of the blood vessel, the puncture needle is pushed completely depending on the experience of medical personnel, and due to the toughness of the human blood vessel, the indwelling sheath often generates large friction resistance with the blood vessel wall when entering the deep part of the blood vessel, so that the indwelling sheath is bent or broken, and the puncture failure of the indwelling needle is caused. Especially in the puncture of artery in-process, because the artery often is placed in subcutaneous depths, has invisibility, consequently in complete puncture process, more easily causes the puncture failure, needs puncture many times, influences patient's experience, increases medical treatment expenditure, increases the nosocomial infection risk.

Disclosure of Invention

The invention aims to provide an indwelling needle, which aims to solve the problems that an indwelling sheath is difficult to push and is easy to bend and break in the existing indwelling needle.

In order to solve the above technical problems, the present invention provides an indwelling needle comprising:

a retention seat having a first end and a second end that pass through along a first axis;

the puncture needle assembly comprises a puncture needle body and an indwelling sheath, wherein the puncture needle body is movably arranged along the first axis; the indwelling sheath is provided with a first through inner cavity for the puncture needle body to penetrate through, one end of the indwelling sheath is fixedly connected with the first end of the indwelling seat, and the other end of the indwelling sheath is a free end; the puncture needle assembly is used for puncturing to a preset position;

the recovery assembly is arranged at the second end of the retention seat and used for recovering and containing the puncture needle body; and

and the guiding component is arranged at the second end of the retention seat and used for guiding the retention sheath to move at the preset position after the recovery component recovers and contains the puncture needle body.

Optionally, the guiding assembly includes:

a push-pull member movably disposed along the first axis;

the retractable sealing component is used for being driven by the push-pull component to extend and retract, and sealing the push-pull component and the recovery component; and

the guide wire is at least partially movably arranged in the sealing part, one end of the guide wire is connected with the push-pull piece, and the other end of the guide wire is a free end;

the guide wire is configured to pass out of the free end of the indwelling sheath when the push-pull member is moved to the first position in the distal direction to guide the indwelling sheath to move at the predetermined position.

Optionally, the guide wire is further configured to withdraw the indwelling seat from the second end of the indwelling seat when the push-pull member is moved in the proximal direction to the second position.

Optionally, the closing member comprises a membrane or a bellows.

Optionally, one end of the sealing component, which is connected with the push-pull component in a sealing manner, comprises a sealing element, the size of an inner hole of the sealing element is matched with the size of an outer contour of the push-pull component, and the sealing element is sleeved outside the push-pull component; the guide assembly further comprises:

the baffle is arranged at one end of the push-pull piece connected with the guide wire, and the outer contour size of the baffle is smaller than the inner size of the corresponding closed part and larger than the inner hole size of the corresponding sealing piece; the baffle is configured to cause the sealing member to extend through the seal when the push-pull member moves in a proximal direction.

Optionally, the recovery assembly comprises a housing, and the indwelling needle further comprises:

and the limiting component is arranged in the shell along the first axis and used for limiting the distance of the push-pull piece moving towards the far end direction.

Optionally, the surface of the guidewire is hydrophilic.

Optionally, the recycling assembly includes:

the shell is detachably connected with the second end of the retention seat; and

the traction component is connected with the puncture needle body, and at least part of the traction component is arranged in the shell; the puncture needle body is pulled;

the needle body is configured to: initially in a third position; the puncture needle body is moved from the third position to a fourth position in the proximal direction under the driving of the pulling component, so that the puncture needle body is accommodated in the shell.

Optionally, the puncture needle body is provided with a second through cavity and a plurality of through holes formed in the radial direction, the through holes are communicated with the second through cavity, and when the puncture needle body is located at the third position, the through holes are located in the retention seat.

Optionally, the retention seat includes a transparent portion, and when the puncture needle body is located at the third position, the through hole on the puncture needle body corresponds to the transparent portion.

Optionally, the recycling assembly further comprises:

a guide plate movably disposed within the housing along the first axis;

the puncture needle body is provided with a head end and a tail end which are opposite, the head end is used for puncturing, and the tail end is connected with the traction part through the guide disc; the interior of the housing is provided with guide rails along a first axis to define radial and circumferential degrees of freedom of the guide plate.

Optionally, the indwelling needle further comprises a limiting component, the limiting component is adjustably arranged in the housing along the first axis relative to the second end of the indwelling needle, and the limiting component is used for limiting the distance of the guiding disc moving towards the proximal direction.

Optionally, the pulling member comprises a pulling wire.

Optionally, a sealing ring is arranged at one end of the shell connected with the indwelling seat, and/or a sealing ring is arranged at the second end of the indwelling seat.

Optionally, the indwelling seat comprises a main branch and a side branch, the main branch penetrates along the first axis, the side branch extends out of the main branch and has a third end, and the recovery component and the guide component are both detachably disposed on the main branch.

In summary, the indwelling needle provided by the invention comprises an indwelling seat, a puncture needle assembly, a recovery assembly and a guide assembly, wherein the puncture needle assembly comprises a puncture needle body and an indwelling sheath; after the puncture needle assembly finishes puncturing, the recovery assembly recovers and accommodates the puncture needle body, and then the guide assembly arranged at the second end of the retention seat can guide the retention sheath to move at a preset position.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:

FIG. 1 is a schematic view showing an initial state of an indwelling needle provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view showing the puncture needle body of the indwelling needle according to the embodiment of the present invention after being recovered;

FIG. 3 is a schematic view of the indwelling needle after the guidewire is pushed out according to an embodiment of the present invention;

FIG. 4 is a schematic view of the indwelling needle after the guidewire has been retracted, according to an embodiment of the present invention;

fig. 5 is an enlarged schematic view of the sealing member and the push-pull member of the indwelling needle according to the embodiment of the present invention.

In the drawings:

100-a retention seat; 101-a first end; 102-a second end; 103-a third terminal;

200-an introducer needle assembly; 210-puncture needle body; 220-an indwelling sheath;

300-a recovery assembly; 310-a housing; 320-a pulling member; 330-a boot disk; 340-a guide rail;

400-a guide assembly; 410-a sealing member; 411-a seal; 420-a guide wire; 430-a push-pull member; 440-a baffle; 450-a stop feature;

500-extension hose.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, the term "proximal" generally being the end near the operator and the term "distal" generally being the end near the patient receiving the puncture.

The core idea of the invention is to provide an indwelling needle to solve the problems that an indwelling sheath is difficult to push and is easy to bend and break in the existing indwelling needle. The indwelling needle includes: the puncture needle comprises a retention seat, a puncture needle assembly, a recovery assembly and a guide assembly, wherein the retention seat at least comprises a first end and a second end which penetrate along a first axis; the puncture needle assembly comprises a puncture needle body and an indwelling sheath, and the puncture needle body is movably arranged along the first axis; the indwelling sheath is provided with a first through inner cavity for the puncture needle body to penetrate through, one end of the indwelling sheath is fixedly connected with the first end of the indwelling seat, and the other end of the indwelling sheath is a free end; the puncture needle assembly is used for puncturing into a preset position; the recovery assembly is arranged at the second end of the retention seat and used for recovering and containing the puncture needle body; the guiding component is arranged at the second end of the retention seat and used for guiding the retention sheath to move at the preset position after the recovery component recovers and contains the puncture needle body. Therefore, after the puncture needle assembly completes puncture, the recovery assembly recovers and accommodates the puncture needle body, and then the guide assembly arranged at the second end of the indwelling seat can guide the indwelling sheath to move at a preset position, so that the problems of bending and breaking of the indwelling sheath caused by directly pushing the indwelling sheath can be avoided, and the success rate of puncture is effectively improved.

The following description refers to the accompanying drawings.

Referring to fig. 1 to 5, wherein fig. 1 is a schematic view of an initial state of an indwelling needle according to an embodiment of the present invention, fig. 2 is a schematic view of a puncture needle body of the indwelling needle according to an embodiment of the present invention after being recovered, fig. 3 is a schematic view of a guide wire of the indwelling needle according to an embodiment of the present invention after being pushed out, and fig. 4 is a schematic view of the indwelling needle according to an embodiment of the present invention after the guide wire is recovered; fig. 5 is an enlarged schematic view of the sealing member and the push-pull member of the indwelling needle according to the embodiment of the present invention.

As shown in fig. 1 to 5, an embodiment of the present invention provides an indwelling needle, including: an indwelling seat 100, a lancet assembly 200, a retraction assembly 300, and a guide assembly 400, the indwelling seat 100 having at least a first end 101 and a second end 102 penetrating along a first axis; the puncture needle assembly 200 comprises a puncture needle body 210 and an indwelling sheath 220, wherein the puncture needle body 210 is movably arranged along the first axis; the indwelling sheath 220 is provided with a first through inner cavity for the puncture needle body 210 to penetrate through, and the puncture needle body 210 is provided with a second through inner cavity for blood to pass through; one end (proximal end) of the indwelling sheath 220 is fixedly connected with the first end 101 of the indwelling seat 100, and the other end is a free end (distal end); indwelling sheath 220 is typically a flexible tube, which first lumen is also used for the passage of fluids in actual use, such as is commonly used for infusion or blood draw; the needle assembly 200 is used to puncture a predetermined location, which may be an artery or vein, for example. The recovery assembly 300 is disposed at the second end 102 of the retention seat 100, and is used for recovering and accommodating the puncture needle body 210; the guiding component 400 is disposed at the second end 102 of the retention seat 100, and is used for guiding the retention sheath 220 to move at a predetermined position after the recovery component 300 recovers and houses the puncture needle body 210.

Generally, before puncturing, the puncture needle assembly 200 is mainly disposed at the first end 101 of the retention seat 100, the recovery assembly 300 is disposed at the second end 102 opposite to the retention seat 100, after puncturing is completed, the puncture needle body 210 can be retracted along the first axis and is accommodated in the recovery assembly 300, and further, the guiding assembly 400 can be used for guiding the retention sheath 220 to move at a predetermined position, so as to avoid bending and breaking of the retention sheath 220 due to direct pushing of the retention sheath 220.

In practice, the retention base 100 generally has a main branch penetrating along a first axis and a side branch extending obliquely from the main branch, wherein the main branch has a first end 101 and a second end 102 at two ends thereof, and the side branch has a third end 103. Preferably, the recovery component 300 and the guiding component 400 are both detachably disposed on the trunk (e.g. the second end 102 of the indwelling seat 100), after the guiding of the indwelling sheath 220 is completed, the indwelling sheath 220 is pushed to a predetermined position (e.g. a certain length deep into the blood vessel), and then the guide wire 420 of the guiding component 400 is received in the guiding component, so that the guiding component 400, the recovery component 300 and the puncture needle body 210 can be detached, and only the indwelling seat 100 and the indwelling sheath 220 are retained as indwelling components. Alternatively, second end 102 of indwelling seat 100 may be connected to an arterial pressure monitoring device after removal of retraction assembly 300. The third end 103 of the indwelling seat 100 is typically connectable to a heparin cap for infusion or the like through an extension hose 500, the extension hose 500 also being a hollow tubular member. In practice, the third end 103 of the indwelling needle 100 is often extended by the extension hose 500 because the side branch of the third end 103 is short, which may cause inconvenience in connecting a heparin cap or an infusion needle in subsequent use. Optionally, the free end of the extension hose 500 may be provided with a sealing cap or a heparin cap to facilitate later blood drawing tests and the like.

As shown in fig. 1, when the indwelling needle is not used and is in an initial state, the puncture needle body 210 is inserted into the first inner cavity, and the tip end of the puncture needle body 210 (i.e., the end used for puncture) protrudes beyond the free end of the indwelling sheath 220, i.e., the tip end of the puncture needle body 210 protrudes out of the first inner cavity. Understandably, the inner diameter of the first inner cavity matches the outer diameter of the puncture needle body 210, and preferably, the puncture needle body 210 and the indwelling sheath 220 are tightly combined and have substantially no gap when they are sleeved together. It should be understood that the junction of the indwelling sheath 220 and the first end 101 may be flush (i.e. the indwelling sheath 220 is completely outside the indwelling seat 100), and the proximal opening of the first lumen is the first end 101 of the indwelling seat 100; the indwelling sheath 220 may also partially extend into the interior of the indwelling needle 100 with the proximal opening of the first lumen located within the interior of the indwelling needle 100, and optionally, the indwelling sheath 220 is integrally formed with the indwelling needle 100.

Preferably, the guide assembly 400 includes: a push-pull member 430, a retractable obturator 410, and a guidewire 420. The push-pull member 430 is movably disposed along the first axis; one end of the sealing member 410 is hermetically connected to the push-pull member 430, and the other end is fixed to the proximal end of the recovery assembly 300, the sealing member 410 is driven by the push-pull member 430 to extend and retract, and seals the push-pull member 430 and the recovery assembly 300; one end of the guide wire 420 is connected with the push-pull member 430 (for example, connected with the push-pull member 430 through a baffle 440, as described in detail below), and the other end is a free end; the guide wire 420 is configured to pass through the free end of the indwelling sheath 220 to guide the indwelling sheath 220 to move at a predetermined position when the push-pull member 430 is moved to the first position in the distal direction. Preferably, the guidewire 420 is further configured to: when the push-pull member 430 moves in the proximal direction to the second position, the retention base 100 is withdrawn from the second end 102 of the retention base 100. In the present embodiment, the push-pull member 430 is a push-pull rod.

Referring to fig. 5, preferably, one end of the sealing component 410, which is connected to the push-pull member 430 in a sealing manner, includes a sealing element 411, an inner hole size of the sealing element 411 matches an outer contour size of the push-pull member 430, and the sealing element 411 is sleeved outside the push-pull member 430; the guide assembly 400 further comprises: the baffle 440 is arranged at one end of the push-pull piece 430 connected with the guide wire 420; the outer contour dimension of the baffle 440 is smaller than the corresponding inner dimension of the closing component 410 and larger than the corresponding inner hole dimension of the sealing element 411; the baffle 440 is configured such that when the push-pull member 430 moves in the proximal direction, the baffle 440 brings the sealing member 410 to extend through the sealing member 411. In an exemplary embodiment, the closing member 410 further comprises a membrane having a third inner cavity having an inner dimension slightly larger than an outer dimension of the push-pull member 430, the push-pull member 430 being movable in the third inner cavity; the proximal end of the third lumen is closed to the push-pull member 430 by a seal 411, the inner bore of the seal 411 being sized to match the outer dimension of the push-pull member 430. The sealing element 411 may be made of a semi-rigid sealing material such as rubber or silica gel, and when the push-pull element 430 moves towards the proximal end (in a direction away from the second end 102), the baffle 440 may be driven to buckle into the film until the baffle 440 contacts and abuts against the sealing element 411, and when the push-pull element 430 continues to move towards the proximal end, the baffle 440 drives the sealing element 411 to move towards the proximal end, and then the sealing element 411 drives the film to stretch out, and meanwhile the baffle 440 drives the guide wire 420 to retract into the film. Preferably, the third lumen is in communication with the interior of the indwelling seat 100 and is isolated from the exterior of the membrane. The stretching of the film can be achieved by folding, stacking, deforming, and curling. Optionally, one end of the guide wire 420 is fixed to the baffle 440 and is connected to the push-pull member 430 through the baffle 440, and the other end is a free end. Preferably, as shown in fig. 4, after the membrane is stretched to the maximum extent, the distance between the connection point of the membrane and the baffle 440 and the second end 102 is greater than the total length of the guide wire 420, so that when the push-pull member 430 moves proximally to fully stretch the membrane, the guide wire 420 can be completely withdrawn from the second end 102 of the retention base 100 and then be completely received in the interior of the membrane and recovery assembly 300.

Preferably, the recycling assembly 300 includes: a housing 310 and a pulling member 320, wherein the housing 310 is detachably connected with the second end 102 of the indwelling seat 100; the pulling member 320 is connected with the puncture needle body 310, and at least part of the pulling member 320 is arranged in the shell 310; for pulling the puncture needle body 210; the needle body 210 is configured to: initially in a third position; the puncture needle body 210 is moved from the third position to a fourth position in the proximal direction by the driving of the pulling member 320, so that the puncture needle body 210 is accommodated in the case 310. The third position mainly refers to the position of the puncture needle body 210 for puncture, and the head end of the puncture needle body extends out of the first inner cavity; in the fourth position, the needle body 210 is moved proximally along the first axis to a position completely received within the housing 310.

As shown in FIGS. 2 and 3, when the push-pull member 430 is moved distally (in a direction toward the second end 102), the guidewire 420 can be driven out of the free end of the indwelling sheath 220, which can also cause the membrane to contract. Preferably, the push-pull member 430, the guide wire 420 and the indwelling seat 100 are coaxially disposed. Here, the membrane and the housing 310 together form a seal for the guide wire 420, so that the guide wire 420 is isolated from the outside, and it is ensured that the patient does not contact with the outside to cause infection during the guiding process of the guide wire 420.

Preferably, the indwelling needle further comprises: a limiting component 450, wherein the limiting component 450 is disposed in the housing along the first axis to limit a distance that the pushing and pulling component 430 moves in a distal direction. When the pushing and pulling member 430 is pushed to the position of the limiting part 450, the length of the free end of the guide wire 420 extending out of the indwelling sheath 220 can be within the range of 3cm to 4cm, so as to better guide the indwelling sheath 220 into the blood vessel, and the thin film can be in a fully contracted state.

In one example, the distance between the limiting member 450 and the second end 102 of the seat 100 is adjustably set in the housing 310, and is adjusted by an adjusting device outside the housing 310, for example, an adjusting slit may be axially formed on the housing 310, and self-sealing rubber films are disposed on two sides of the adjusting slit, the limiting member 450 passes through the adjusting slit through a connecting rod to be connected with the adjusting device outside the housing 310, and the movement of the adjusting device drives the limiting member 450 to move, so as to achieve the adjustment. In other examples, the limiting member 450 may also have magnetism, and the adjustment may be achieved by a magnetic adjustment device outside the housing 310. When the push-pull member 430 is pushed to the position of the position-limiting member 450, it is blocked by the position-limiting member 450 and cannot move any further. The stop member 450 thereby limits the distal movement of the push-pull member 430, thereby limiting the length of the guidewire 420 that extends beyond the free end of the indwelling sheath 220. Preferably, in order to ensure that the guiding range of the guide wire 420 has a certain elastic space under some special conditions to ensure the better applicability of the product, the adjusting range of the limit of the push-pull member 430 by the limit component 450 (the length of the guide wire 420 extending out of the free end of the indwelling sheath 220) can be set to be 2 cm-5 cm.

Alternatively, as shown in fig. 1, when the indwelling needle is not used but in the initial state, the membrane may be in a completely folded state so that the whole indwelling needle can be as short as possible for packaging and transportation. Preferably, the push-pull member 430 is initially located at a distance from the membrane to ensure that the free end of the guide wire 420 is fully received within the head end of the puncture needle body 210, so as to facilitate the puncture of the puncture needle body 210.

Since the indwelling needle is generally protected by sealing when it is not in use but in an initial state, further, the recovery component 300 and the guide component 400 connected with the indwelling needle 100 together form a sealing system (such as being contained in a sealed bag), which can ensure that the guide wire 420 does not contact with the outside during the storage and transportation of the indwelling needle, and thus, the indwelling needle is kept clean. Furthermore, the sealing state of the membrane can ensure that the punctured person can not contact with the outside to cause infection in the guiding process of the guide wire 420, and the operator can not contact with the blood of the punctured person to cause infection in the guiding process. In addition, after the puncture process of the indwelling needle is completed, the recovery assembly 300 and the guide assembly 400 are detached from the indwelling seat 100, and the guide wire 420 contaminated with blood is completely contained in the film, so that the contact between an operator and a blood source is blocked, and the risk of infection is avoided. It is understood that in other embodiments, a bellows may be used instead of a membrane as the body member of the sealing member 410. The corrugated pipe also has better expansion and contraction performance and can replace a film.

Preferably, the surface of the guide wire 420 has hydrophilicity, for example, the surface of the guide wire 420 can be coated with a hydrophilic coating, so that the guide wire 420 is ensured to be very smooth after contacting blood, and the friction between the guide wire 420 and the vessel wall is greatly reduced, thereby better playing a guiding role.

Optionally, housing 310 is a tubular body with one end detachably connected to second end 102 of indwelling needle 100, such as a screw-in fixation manner similar to a heparin cap. The recovery assembly 300 further comprises: a guide plate 330, the guide plate 330 being movably disposed within the housing 310 along the first axis; the interior of the housing 310 is provided with guide rails 340 along a first axis, the guide rails 340 serving to define the radial and circumferential degrees of freedom of the guide disc 330. Specifically, the outer diameter of the guide plate 330 is substantially the same as or slightly smaller than the inner diameter of the housing 310, and the guide plate 330 can move freely along the first axis in the housing 310, preferably, the guide rail 340 protrudes from the inner wall of the housing 310, and a rail hole is formed on the surface of the guide plate 330, and the rail hole is matched with the guide rail 340, so that when the guide plate 330 is placed in the housing 310, the rail hole is aligned with the guide rail 340, and the guide rail 340 defines that the guide plate 330 cannot jump in the radial direction or rotate in the circumferential direction, thereby ensuring that the guide plate 330 can only move in the axial direction. Further, the end of the puncture needle body 210 is connected to the drawing member 320 via the guide plate 330. Optionally, the end of the puncture needle body 210 is fixedly connected to one end of the guiding disc 330, and the other end of the guiding disc 330 is fixedly connected to the pulling member 320, so that the puncture needle body 210 can be moved by pulling the pulling member 320 through the guiding disc 330. Preferably, the pulling member 320 comprises a pulling wire having one end fixed to the guide plate 330 and the other end extending out of the housing 310 as a free end for being pulled by the operator. Preferably, the free end of the pull wire is connected with a pull ring for convenient operation. It will be appreciated that the pulling member 320 may also include other mechanisms in place of the pull wire, such as a pull rod or the like.

Preferably, the guide disk 330 is positioned coaxially with the needle body 210, i.e., the tip of the needle body 210 is attached to the center of the guide disk 330. More preferably, the inner diameter of the second inner cavity of the puncture needle body 210 is larger than the outer diameter of the guide wire 420, a through hole is further axially formed in the center of the guide disc 330, the through hole is communicated with the second inner cavity of the puncture needle body 210 so as to facilitate the guide wire 420 to pass through, and optionally, a self-sealing ring is arranged around the through hole so as to maintain the sealing of the guide wire 420. Preferably, the guide rails 340 are two and are oppositely disposed along the diameter direction of the housing 310, and similarly, the guide plate 330 is relatively provided with two rail holes, and the two guide rails 340 can better guide and limit the guide plate 330.

It is understood that in other embodiments, the guide rail 340 may be disposed in a groove on the housing 310, and the guide plate 330 may be provided with a protrusion on the outer circumference; alternatively, the guide rail 340 is a separate rail, and the guide plate 330 has a matching notch; in addition, the number of the guide rails 340 is not limited to one or two, and those skilled in the art can configure the guide rails as required, which is not intended to limit the present invention.

Preferably, the axis of the housing 310 coincides with the first axis of the trunk of the indwelling needle 100. During the movement of the guiding disc 330, at least the distal side (left side in the figure) of the guiding disc 330 is kept not connected with the outside, i.e. the guiding disc 330 seals the retention seat 100, so as to prevent the puncture needle body 210 from contacting with the outside.

Preferably, the limiting member 450 is further used to limit the distance that the guiding disc 330 moves in the proximal direction, and in particular, when the guiding disc 330 is driven by the pulling member 320 to move proximally until the limiting member 450 is located, the limiting member 450 blocks the guiding disc 330 from moving further, so as to avoid the guiding disc 330 being pulled out of the housing 310 and causing the puncture needle body 210 and blood contaminated by the puncture needle body to contact with the operator. It will be appreciated that when the stop 450 is adjusted to the maximum position (i.e., the position of the stop 450 is closest to the second end 102 within its adjustable range), the guide plate 330 is moved to the position of the stop 450, and the distance between the guide plate 330 and the second end 102 of the retention seat is no less than the overall length of the lancet body 210, so that the lancet body 210 can be completely accommodated in the housing 310. The sealed arrangement of the retraction assembly 300, the guide assembly 400 and the housing 310 ensures that the indwelling needle is not infected during storage and transportation, prevents the operator from contacting the blood of the patient, and avoids the risk of the operator being infected by the blood of the patient.

Preferably, the puncture needle body 210 has a plurality of through holes 212 formed along the radial direction, the through holes 212 are communicated with the second inner cavity, and when the puncture needle body 210 is located at the third position, the through holes are located in the retention seat 100. The puncture needle body 210 can be a hollow steel needle, and in practice, the puncture needle assembly 200 is used for puncturing a blood vessel, and blood can flow out through the second inner cavity of the puncture needle body 210 to indicate the process of puncturing. Further, flashback blood can escape from the through bore or the proximal opening, facilitating the operator to observe the state of the needle assembly 200 as it enters the blood vessel. In an exemplary embodiment, the number of the through holes is two, the opening directions of the two through holes are opposite, and the two through holes are arranged at a certain distance so that an operator can observe the two through holes at different angles. In other embodiments, one or more through holes may be provided. Preferably, the retention seat 100 has at least one transparent portion, and when the puncture needle body 210 is in the third position, the through hole of the puncture needle body 210 corresponds to the transparent portion, so that the operator can observe the through hole conveniently. It is understood that indwelling device 100 may also be transparent throughout. Preferably, the housing 310 is also transparent, and the housing 310 has a scale for displaying the position of the position-limiting member 450, so as to reflect the distance that the guide wire 420 is limited from entering the deep blood vessel.

Further, a sealing ring is disposed at one end of the housing 310 connected to the retaining base 100, or a sealing ring is disposed at the second end 102 of the retaining base 100, or both the end of the housing 310 connected to the retaining base 100 and the second end 102 of the retaining base 100 are disposed with a sealing ring. The seal here may be a rubber seal or the like, and is mainly used to prevent blood from overflowing after the puncture needle body 210 is accommodated in the case 310. When the puncture needle body 210 is in the fourth position, the puncture needle body 210 is completely accommodated in the casing 310, and after the recovery assembly 300, the puncture needle body 210 and the guide assembly 400 are detached from the indwelling seat 100, the puncture needle body 210 is also closed, thereby being beneficial to the recovery of medical waste in the later period and avoiding the risk that recovery personnel are pricked by the puncture needle body 210 in the recovery process of the medical waste.

The following describes the specific steps of using the indwelling needle provided in this embodiment with reference to the drawings.

Step 1: in the indwelling needle puncture procedure, the radial artery or other arteriovenous is first punctured with the needle assembly 200, and when a small amount of blood flow out of the through-hole is observed, it can be roughly determined that the needle assembly 200 has passed through the blood vessel (typically, penetrating the blood vessel at this time).

Step 2: the pulling member 320 is slowly pulled to drive the puncture needle body 210 to retreat towards the proximal end until the puncture needle body 210 reaches the fourth position, and the puncture needle body 210 is completely accommodated in the housing 310 (as shown in fig. 2).

And step 3: slowly withdrawing the indwelling sheath 220 and confirming that the free end of the indwelling sheath 220 enters the blood vessel when a blood jet (large blood flow) condition is seen.

And 4, step 4: the push-pull member 430 is pushed to the distal end to slowly advance the guide wire 420, and the guide wire 420 passes through the first lumen of the indwelling sheath 220 and out to the blood vessel until the push-pull member 430 is stopped by the stop member 450, and the guide wire 420 reaches the maximum push distance (as shown in fig. 3).

And 5: the push-pull member 430 is fixed, and the indwelling sheath 220 is pushed to a predetermined depth under the guidance of the guide wire 420.

Step 6: pulling the push-pull member 430 proximally retracts the guidewire 420, causing the stop 440 to snap into the membrane, thereby stretching the membrane, such that the guidewire 420 is fully received within the membrane and the housing 310 (shown in fig. 4).

And 7: the retraction assembly 300, the guide assembly 400, and the needle body 210 are detached, exposing the second end 102 of the retention base 100.

Step 7 a: optionally, the second end 102 of the indwelling needle 100 is cannulated with a heparin cap.

And 7 b: optionally, an arterial pressure monitoring tube is attached to the second end 102 of the indwelling seat 100.

After the above steps are completed, the puncture process of the indwelling needle is completed, and in actual use, only the indwelling needle 100 and the indwelling sheath 220 are left as the use members, and the indwelling sheath 220 is indwelling in the predetermined blood vessel. The remaining recovery assembly 300, guide assembly 400, and needle body 210 are all recovered.

In summary, the indwelling needle provided by the invention comprises an indwelling seat, a puncture needle assembly, a recovery assembly and a guide assembly, wherein the puncture needle assembly comprises a puncture needle body and an indwelling sheath; after the puncture needle assembly finishes puncturing, the recovery assembly recovers and accommodates the puncture needle body, and then the guide assembly arranged at the second end of the indwelling seat can guide the extending direction of the indwelling sheath.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. An indwelling needle, comprising:

2. The indwelling needle according to claim 1, wherein the guiding assembly comprises:

a push-pull member movably disposed along the first axis;

3. The indwelling needle according to claim 2, wherein the guidewire is further configured to withdraw the retention seat from the second end of the retention seat upon movement of the push-pull member in the proximal direction to the second position.

4. The indwelling needle according to claim 2, wherein the sealing member comprises a membrane or bellows.

5. The indwelling needle of claim 2, wherein the end of the sealing component, which is hermetically connected with the push-pull part, comprises a sealing element, the size of the inner hole of the sealing element is matched with the size of the outer contour of the push-pull part, and the sealing element is sleeved outside the push-pull part; the guide assembly further comprises:

6. The indwelling needle of claim 2, wherein the retraction assembly comprises a housing, the indwelling needle further comprising:

7. The indwelling needle according to claim 2, wherein the surface of the guidewire is hydrophilic.

8. The indwelling needle according to claim 1, wherein the retraction assembly comprises:

the traction component is connected with the puncture needle body, at least part of the traction component is arranged in the shell, and the traction component is used for traction of the puncture needle body;

9. The indwelling needle of claim 8, wherein the needle body has a second lumen therethrough and a plurality of radially extending through holes communicating with the second lumen, the through holes being located in the retention seat when the needle body is in the third position.

10. The indwelling needle of claim 9, wherein the indwelling needle comprises a transparent portion and the through hole in the needle body corresponds to the transparent portion when the needle body is in the third position.

11. The indwelling needle of claim 8, wherein the retraction assembly further comprises:

a guide plate movably disposed within the housing along the first axis;

12. The indwelling needle according to claim 11, further comprising a restraining member adjustably disposed within the housing along the first axis at a distance from the second end of the indwelling needle, the restraining member configured to limit the distance the guiding disc moves in the proximal direction.

13. The indwelling needle according to claim 8, wherein the pulling member comprises a pull wire.

14. The indwelling needle according to claim 8, wherein the end of the housing connected to the indwelling needle is provided with a sealing ring and/or the second end of the indwelling needle is provided with a sealing ring.

15. The indwelling needle according to claim 1, wherein the indwelling needle comprises a main stem and a side branch, the main stem extending along the first axis, the side branch extending from the main stem and having a third end, the retraction assembly and the guide assembly being both removably mounted to the main stem.