CN112546337A

CN112546337A - Indwelling needle

Info

Publication number: CN112546337A
Application number: CN201910918507.8A
Authority: CN
Inventors: 钟志雄; 张鹏飞; 范云平; 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 assembly, a recovery assembly and a guide assembly, wherein the indwelling seat comprises a main branch and a side branch, the main branch is communicated along a first axis and is provided with a first end and a second end, and the side branch is provided with a third end; the puncture needle assembly comprises a puncture needle body and an indwelling sheath, the puncture needle body is movably arranged along the first axis, and the indwelling sheath is fixed at the first end of the main branch; the puncture needle assembly is used for puncturing into a preset position; the recovery assembly is arranged at the second end of the main branch and used for recovering and accommodating the puncture needle body; the guiding component is arranged at the third end of the side branch and used for guiding the indwelling sheath to move at the preset position after the recovery component recovers and contains the puncture needle body. So the configuration can avoid the problem that the indwelling sheath is bent and broken because of directly pushing the indwelling sheath, effectively improve the puncture success rate and 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:

the retention seat comprises a main branch and a side branch which are communicated, the main branch penetrates through the retention seat along a first axis and is provided with a first end and a second end, and the side branch is provided with a third end;

the puncture needle assembly comprises a puncture needle body and an indwelling sheath, the puncture needle body is movably arranged along the first axis, and the indwelling sheath is fixed at the first end of the main branch; the puncture needle assembly is used for puncturing into a preset position;

the recovery assembly is arranged at the second end of the main branch and used for recovering and accommodating the puncture needle body; and

and the guiding component is arranged at the third end of the side branch and is used for guiding the indwelling sheath to move at the preset position after the recovery component recovers and contains the puncture needle body.

Optionally, the indwelling sheath has a through first inner cavity for the puncture needle body to penetrate through, one end of the indwelling sheath is connected with the first end of the main branch, and the other end is a free end;

the recovery assembly is configured to maintain the third end of the side branch communicated with the first inner cavity after the puncture needle body is recovered and accommodated.

Optionally, the guiding assembly includes:

one end of the telescopic closed component is detachably connected with the third end of the side branch, and the other end of the telescopic closed component is a free end and is closed; and

a guide wire at least a part of which is disposed inside the sealing member;

the guide wire is configured to penetrate into the first lumen via a third end of the side branch and to exit out of the free end of the indwelling sheath upon contraction of the obturator to guide movement of the indwelling sheath at the predetermined location.

Optionally, the guide wire is further configured to be entirely received inside the sealing member after the sealing member is fully extended.

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

Optionally, the guiding assembly further comprises:

the buckle is arranged at one end of the sealing component; and

the clamping hook is arranged at the other end of the sealing component;

the buckle is matched with the clamping hook, and the buckle is used for being clamped with the clamping hook after the closed component is contracted.

Optionally, the surface of the guidewire is hydrophilic.

Optionally, the recycling assembly includes:

a housing removably coupled to the second end of the trunk branch; and

a pull member coupled to the housing and at least partially disposed within the housing, the pull member being movably or telescopically disposed along the first axis between a first position and a second position;

the puncture needle body is provided with a head end and a tail end which are opposite to each other, the head end is used for puncturing, the tail end is connected with the traction piece, and the puncture needle body is configured to:

when the pulling piece is at the first position, the head end is received in the interior of the shell;

when the retractor is in the second position, the head end extends beyond the indwelling sheath.

Optionally, the puncture needle body has a second inner cavity and a plurality of through holes radially formed therein, the through holes are communicated with the second inner cavity, and when the pulling member is located at the second position, the through holes are located in the housing or the retention seat.

Optionally, the housing or the retention seat includes a transparent portion, and when the pulling member is in the second position, the through hole is located corresponding to the transparent portion.

Optionally, the pulling member and the housing are provided with a matching engaging structure, and when the pulling member is located at the first position, the engaging structure limits the axial degree of freedom of the pulling member relative to the housing.

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.

The recycling assembly is detachably arranged at the second end of the main branch, and the guiding assembly is detachably arranged at the third end of the side 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 on the side branch of the indwelling seat can guide the indwelling 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 a state where the guide wire of the indwelling needle is pushed out 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; 211-a head end; 212-a via; 220-an indwelling sheath;

300-a recovery assembly; 310-a housing; 320-a pull;

400-a guide assembly; 410-a sealing member; 420-a guide wire; 430-fastener; 440-trip; 450-extension hose; 460-a connector; 470-membrane closure lid.

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; the indwelling seat comprises a main branch and a side branch, wherein the main branch penetrates along a first axis and is provided with a first end and a second end, and the side branch is provided with a third end; the puncture needle assembly comprises a puncture needle body and an indwelling sheath, the puncture needle body is movably arranged along the first axis, and the indwelling sheath is fixed at the first end of the main branch; the puncture needle assembly is used for puncturing into a preset position; the recovery assembly is arranged at the second end of the main branch and used for recovering and accommodating the puncture needle body; the guiding component is arranged at the third end of the side branch and used for guiding the indwelling sheath to move at the preset position after the recovery component recovers and contains the puncture needle body. The configuration can avoid the problem that the indwelling sheath is bent and broken due to direct pushing of the indwelling sheath, and effectively improves the success rate of puncture.

The following description refers to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of an initial state of an indwelling needle according to an embodiment of the present invention, and fig. 2 is a schematic view of a guide wire push-out state of the indwelling needle according to an embodiment of the present invention.

As shown in fig. 1 and 2, the present embodiment provides an indwelling needle comprising: an indwelling needle assembly 100, a lancet assembly 200, a retraction assembly 300, and a guide assembly 400. The retention seat 100 comprises a trunk branch passing through along a first axis and having a first end 101 and a second end 102, and a bypass branch having a third end 103; 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, and the indwelling sheath 220 is fixed at the first end 101 of the main branch; the needle assembly 200 is used to puncture a predetermined location, such as an artery or vein; the recycling assembly 300 is disposed at the second end 102 of the main branch for recycling and accommodating the puncture needle body 210; the guiding component 400 is disposed at the third end 103 of the side branch, and is used for guiding the indwelling sheath 220 to move at the predetermined position after the recovery component 300 recovers and houses the puncture needle body 210.

In practice, the retention base 100 generally has a main branch penetrating along the first axis and a side branch extending obliquely from the main branch, the main branch having a first end 101 and a second end 102 at two ends thereof, and the side branch having a third end 103. The puncture needle assembly 200 is arranged at the first end 101 of the trunk of the retention seat 100, the recovery assembly 300 is arranged at the second end 102 opposite to the trunk of the retention seat 100, after the puncture is completed, the puncture needle body 210 can retract along the first axis and be accommodated in the recovery assembly 300, and further, the guide assembly 400 arranged at the third end 103 of the side branch can be used for guiding the retention sheath 220 to move at a preset position, so as to avoid bending and breaking of the retention sheath 220 caused by directly pushing the retention sheath 220. Preferably, after the guiding of the indwelling sheath 220 is completed, the indwelling sheath 220 is pushed to the target site (e.g., into the blood vessel by a certain length), and then the guiding assembly 400, the recovering assembly 300 and the puncture needle body 210 are removed, leaving only the indwelling seat 100 and the indwelling sheath 220 as the indwelling use component. Optionally, the recovery component 300 is detachably disposed at the second end 102 of the main branch, the guiding component 400 is detachably disposed at the third end 103 of the side branch, the second end 102 of the indwelling seat 100 can be connected to an arterial pressure detecting device or a heparin cap after the recovery component 300 is removed, and the third end 103 of the indwelling seat 100 can be connected to a heparin cap after the guiding component 400 is removed, so as to supply infusion and the like.

Preferably, the indwelling sheath 220 has a first through inner cavity for the puncture needle body 210 to pass through, one end (proximal end) of the indwelling sheath 220 is connected with the first end 101 of the main branch, and the other end is a free end (distal end); the retraction assembly 300 is configured to retain the third end 103 of the side branch in communication with the first lumen after retraction and accommodation of the needle body 210. In general, the indwelling sheath 220 is a flexible tube, the first inner cavity of which is used for liquid passing in actual use, such as commonly used for transfusion or blood drawing, and the puncture needle body 210 is inserted into the first inner cavity when the indwelling needle is not used and is in an initial state (i.e., before puncture is performed), and the head end 211 (i.e., the end used for puncture) of the puncture needle body 210 is beyond the free end of the indwelling sheath 220, i.e., the head end 211 of the puncture needle body 210 is protruded 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, when the indwelling sheath 220 is partially disposed to extend into the interior of the indwelling base 100 and the proximal end of the indwelling sheath 220 is closer to the second end 102 than the third end 103, a small hole may be formed in the indwelling sheath 220 at a position corresponding to the third end 103 in a radial or oblique direction to facilitate penetration of the guide assembly 400.

Preferably, the guide assembly 400 includes: a retractable sealing member 410 and a guide wire 420. One end of the sealing component 410 is detachably connected with the third end 103 of the side branch, and the other end is a free end and is sealed; at least a part of the guide wire 420 is disposed inside the sealing member 410; the guide wire 420 is configured to penetrate into the first lumen from the third end 103 of the side branch and to pass out from the free end of the indwelling sheath 220 when the closing member 410 is contracted, so as to guide the indwelling sheath 220 to move at a predetermined position.

In an exemplary embodiment, the sealing member 410 comprises a membrane having a third inner cavity, such as a flat bag shape, for accommodating the guide wire 420, one end of the membrane is detachably connected to the third end 103 of the indwelling seat 100 through the connector 460, the other end is sealed by a membrane sealing cover 470, the third inner cavity is communicated with the inside of the indwelling seat 100, and the third inner cavity is sealed with the outside 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 membrane sealing cover 470, and the other end is a free end. Preferably, the maximum extended length of the membrane is greater than the total length of the guide wire 420, so that the guide wire 420 can be completely received inside the membrane when the membrane is fully extended. When the membrane shrinks, the guide wire 420 is driven to extend into the indwelling base 100 from the third end 103 of the indwelling base 100, and penetrates into the first inner cavity from the proximal opening of the first inner cavity of the indwelling sheath 220, and further penetrates out from the free end of the indwelling sheath 220.

Preferably, when the membrane is fully contracted, the length of the free end of the guidewire 420 extending out of the indwelling sheath 220 can be in the range of 3cm to 4cm, so as to better guide the indwelling sheath 220 into the blood vessel. Alternatively, when the indwelling needle is not in use and is in the initial state, the membrane may be in a partially folded state, in which most of the guide wire 420 is located in the third lumen of the membrane, and a small part of the guide wire 420 extends into the indwelling seat 100 through the third end 103 of the indwelling seat 100, but the part of the guide wire 420 is located only in the side branch of the indwelling seat 100 and does not contact the puncture needle assembly 200. In practice, the operator can push the guide wire 420 through the film by utilizing the deformable characteristic of the film, and the closed state of the film can ensure that the punctured person does not contact with the outside to cause infection at the position of the guide wire 420 in the guiding process, and the operator does not contact with the blood of the punctured person to cause infection at the position of the punctured person. Since the first end 101 of the indwelling needle 100 is generally sealed and protected when the indwelling needle is not used and is in the initial state, the recovery assembly 300 and the guide assembly 400 connected to the whole indwelling needle 100 form a sealing system (e.g., are contained in a sealed bag) together, so that the guide wire 420 is kept clean without contacting with the outside during the storage and transportation of the indwelling needle.

In addition, after the puncture process of the indwelling needle is completed, the guide wire 420 contaminated with blood is completely contained in the film after the guide assembly 400 is detached from the indwelling seat 100, so that the contact between the operator and the 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.

Optionally, the closing member 410 is connected to the third end 103 of the indwelling seat 100 by an extension hose 450. It is understood that the extension hose 450 is also a hollow tubular member. Specifically, sealing member 410 is connected to one end of extension tube 450 via connector 460, and the other end of extension tube 450 is connected to third end 103 of indwelling seat 100. At this point, the guidewire 420 is also correspondingly elongate. In practice, the side branch tube of the indwelling needle 100 is short, which is inconvenient for connecting a heparin cap or an infusion needle in subsequent use, and therefore the side branch tube is often extended by using the extension hose 450. In some embodiments, when the indwelling needle is not in use and is in the initial state, most of the guidewire 420 is located in the third lumen of the membrane, and a small portion of the guidewire 420 extends out of the connector 460 and through the extension hose 450.

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.

More preferably, the guide assembly 400 further comprises: the buckle 430 and the hook 440 are respectively arranged at two opposite ends of the sealing component 410, the buckle 430 is matched with the hook 440, and after the sealing component 410 is contracted, the buckle 430 is used for being clamped with the hook 440. In one embodiment, the buckle 430 is disposed on the film sealing cover 470, and the hook 440 is disposed on the connecting head 460, so that when the film is completely contracted, the buckle 430 can just buckle on the hook 440, thereby fixing the axial extension length of the guide wire 420. The position of the buckle 430 and the hook 440 can be changed in other embodiments, that is, the hook 440 is disposed on the film sealing cover 470, and the buckle 430 is disposed on the connecting head 460, as long as the two are located at two ends of the sealing member 410.

Referring to fig. 1 and 2, the recycling assembly 300 includes: a housing 310 and a pull 320. The housing 310 is detachably connected with the second end 102 of the main branch; the pulling member 320 moves or extends along the first axis between a first position and a second position, and at least a portion of the pulling member 320 is disposed in the housing 310. The puncture needle body 210 has a head end 211 and a tail end 211 opposite to each other, the head end 211 is used for puncturing, the tail end is connected with the traction piece 320, and the puncture needle body 210 is configured to: when the puller 320 is in the first position, the head end 211 is received inside the housing 310; when the puller 320 is in the second position, the head end 211 extends out of the indwelling sheath 220.

In an exemplary embodiment, housing 310 is a tubular body having one end removably connected to second end 102 of indwelling needle 100, such as by a screw-in fixation similar to a heparin cap. The pulling member 320 is also a tubular body movably disposed at the other end of the housing 310. The tube diameter of the pulling element 320 is matched with the tube diameter of the shell 310, for example, if the outer diameter of the pulling element 320 is equivalent to the inner diameter of the shell 310, the pulling element 320 can be arranged in the shell 310 in a penetrating way; in another example, the inner diameter of the pulling element 320 is equal to the outer diameter of the housing 310, and the pulling element 320 is sleeved outside the housing 310. The proximal end of the pull 320 is closed. Preferably, the axis of housing 310 coincides with the first axis of the trunk of indwelling needle 100 along which pull 320 also moves. During the movement of the pulling element 320, the inside of the casing 310 is kept disconnected from the outside, i.e. the pulling element 320 seals the casing 310, so as to prevent the puncture needle body 210 from contacting the outside. In other embodiments, the retractor 320 can also be a retractable body, such as a bellows, etc., and the retraction of the retractor 320 can be used to keep the housing 310 closed while the lancet body 210 is being moved.

Preferably, when the indwelling needle is not in use and is in the initial state, the pulling member 320 is in the second position, the pulling member 320 is in the most distal position in the movable range thereof, most of the pulling member 320 is disposed in the housing 310, the distal end portion of the puncture needle body 210 connected to the pulling member 320 is inserted into the first inner lumen of the indwelling sheath 220, and the head end 211 (i.e., the distal end portion) of the puncture needle body 210 is extended out of the indwelling sheath 220 for puncture. When the pulling element 320 moves towards the proximal end, the puncture needle body 210 is driven to move towards the proximal end direction and exit from the indwelling sheath 220, when the pulling element 320 moves to the first position (i.e. the maximum extension state), the pulling element is located at the most proximal position in the movable range, the puncture needle body 210 is completely accommodated in the housing 310 and the pulling element 320, the head end 211 of the puncture needle body 210 does not exceed the distal end of the housing 310, as shown in fig. 2, at this time, the pulling element 320 is located at the first position, and the puncture needle body 210 is located at the exit state.

It can be understood that when the pulling element 320 is in the first position, the total length of the recovery assembly 300 (the combined length of the pulling element 320 and the casing 310) is not less than the total length of the puncture needle body 210, so that the puncture needle body 210 can be completely accommodated in the pulling element 320 and the casing 310. The retraction assembly 300 solves the retraction problem of the needle body 210, prevents the operator from contacting the patient's blood, and avoids the risk of infection to the operator.

Preferably, the pulling element 320 and the housing 310 are provided with matching engaging structures, and when the pulling element 320 is in the first position, the engaging structures limit the axial freedom of the pulling element 320 relative to the housing 310. In an alternative embodiment, the distal end of the pulling element 320 is provided with an annular protruding snap ring, and the proximal end of the housing 310 is provided with an annular snap ring matching with the protruding snap ring of the pulling element 320, so that when the pulling element 320 moves to the first position, the protruding snap ring is snapped into the snap ring to prevent the pulling element 320 from further moving axially, thereby fixing the position of the pulling element 320 relative to the housing 310. Preferably, the protruding snap ring of the snap structure snaps into the snap groove, indicating that the recovery assembly 300 is completing the recovery of the lancet body 210.

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 of the retaining base 100, or both the end of the housing 310 connected to the retaining base 100 and the second end of the retaining base 100 are disposed with sealing rings. 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 pulling member 320 is located at the first position, the puncture needle body 210 is completely accommodated in the cavity formed by the casing 310 and the pulling member 320, and after the recovery assembly 300 is detached from the indwelling seat 100, the puncture needle body is also closed, so that the recovery of medical waste in the later period is facilitated, and the risk that recovery personnel are pricked by the puncture needle body 210 in the recovery process of the medical waste is avoided.

Preferably, the puncture needle body 210 has a second through-hole and a plurality of through-holes 212 formed along the radial direction, the through-holes 212 are through to the second through-hole, and when the pulling element 320 is located at the second position, the through-holes 212 are located in the housing 310 or 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, the blood can escape from the through hole 212, which facilitates the operator to observe the state of the needle assembly 200 entering the blood vessel. In an exemplary embodiment, there are two through holes 212, the two through holes 212 are opened in opposite directions, and the two through holes 212 are spaced apart from each other to facilitate observation at different angles by an operator. In other embodiments, one or more through holes 212 may be provided. Preferably, the housing 310 or the retention base 100 includes a transparent portion, and when the pulling member 320 is in the second position, the through hole 212 is located corresponding to the transparent portion for the operator to observe. Preferably, the housing 310 is transparent and the docking station 100 is also transparent for easy viewing.

The following describes the specific use procedure of the indwelling needle provided in this embodiment with reference to fig. 1 and 2.

Step 1: during the indwelling needle puncture procedure, the radial artery or other artery and vein is first punctured with needle assembly 200, and when a small amount of blood is observed flowing out of through-hole 212, it can be roughly determined that needle assembly 200 has passed through the blood vessel (typically, penetrating the blood vessel in this case).

Step 2: the slow retraction pulling member 320 drives the puncture needle body 210 to retract towards the proximal end until the puncture needle body 210 exposes the third end 103 to the passage of the first inner cavity of the indwelling sheath 220, so as to ensure the passing path of the guide wire 420. The tip 211 of the needle body 210 is now located within the retention seat 100.

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 operator holds the membrane of the sealing member 410, slowly advances the guidewire 420, and the guidewire 420 is passed out of the first lumen of the indwelling sheath 220 into the blood vessel.

And 5: the guide wire 420 reaches the maximum push distance after the film of the closure member 410 is fully retracted.

Step 6: the guide wire 420 is kept still, and the indwelling sheath 220 is pushed to a predetermined depth under the guidance of the guide wire 420, at which time the sealing member 410 is stretched, and the guide wire 420 and the indwelling sheath 220 move relatively.

And 7: the operator grips the film of the sealing member 410, retracts the guide wire 420 until the film of the sealing member 410 is completely stretched, and separates the guide member 400 from the indwelling needle 100 after the guide wire 420 is completely received in the film.

Step 7 a: optionally, a soft plug is used to close the connector 460 at the distal end of the sealing member 410 to prevent blood carried by the guidewire 420 from contaminating the operator or other personnel.

And 7 b: optionally, the third end 103 of the indwelling seat 100 (which is the proximal end of the extension tube 450 when the extension tube 450 is provided) is sealed with a heparin cap, so as to facilitate the later blood drawing test and the like.

And 8: the pulling element 320 is further retracted to drive the puncture needle body 210 to retract towards the proximal end until the puncture needle body 210 is completely accommodated in the collection assembly 300 (i.e. the head end 211 of the puncture needle body 210 is accommodated in the housing 310).

And step 9: the recovery assembly 300 is detached from the needle body 210 exposing the second end 102 of the retention base 100.

Step 9 a: optionally, the second end 102 of the indwelling needle 100 is cannulated with a heparin cap.

And step 9 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 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 200 is placed in the predetermined blood vessel. The remaining recovery assembly 300, guide assembly 400, and needle body 210 are all recovered.

Further, in the above process, if the operator needs to loosen the guide wire for other operations after step 5, the fastener 430 on the film sealing cover 470 may be first snapped into the hook 440 on the connector 460 to fix the guide wire 420, and after the related operations are completed, the fastener 430 is separated from the hook 440 to re-hold the guide wire 420, and step 6 is performed.

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 indwelling sheath has a first lumen therethrough for the puncture needle body to pass through, one end of the indwelling sheath being connected to the first end of the main shaft, the other end being a free end;

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

a guide wire at least a part of which is disposed inside the sealing member;

4. The indwelling needle according to claim 3, wherein the guidewire is further configured to be entirely received within the sealing member after the sealing member is fully extended.

5. The indwelling needle according to claim 3, wherein the sealing member comprises a membrane or bellows.

6. The indwelling needle according to claim 3, wherein the guiding assembly further comprises:

the buckle is arranged at one end of the sealing component; and

the clamping hook is arranged at the other end of the sealing component;

7. The indwelling needle according to claim 3, wherein the surface of the guidewire is hydrophilic.

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

a housing removably coupled to the second end of the trunk branch; and

9. The indwelling needle of claim 8, wherein the needle body has a second lumen therethrough and a plurality of radially disposed through holes therethrough, the through holes communicating with the second lumen, the through holes being located in the housing or the indwelling needle when the pull is in the second position.

10. The indwelling needle according to claim 9, wherein the housing or the indwelling hub comprises a transparent portion and the through hole is located in correspondence with the transparent portion when the pull is in the second position.

11. The indwelling needle according to claim 8, wherein the pull and the housing are provided with mating engagement formations which limit the axial freedom of the pull relative to the housing when the pull is in the first position.

12. 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.

13. The indwelling needle of claim 1, wherein the retraction assembly is removably disposed at the second end of the main limb and the guide assembly is removably disposed at the third end of the side limb.