WO2017113852A1

WO2017113852A1 - Medical catheter assembly with non-detachable puncture needle

Info

Publication number: WO2017113852A1
Application number: PCT/CN2016/097725
Authority: WO
Inventors: 邹最; 王冶; 马宇尘; 陈原丽; 李成宝; 周苗; 薛燕; 徐丽霞
Original assignee: 江苏阳普医疗科技有限公司; 邹最
Priority date: 2015-12-30
Filing date: 2016-08-31
Publication date: 2017-07-06
Also published as: CN106924839A

Abstract

A medical catheter assembly with a non-detachable puncture needle comprises: a catheter hub (1a), an indwelling catheter (2a), a needle base (3a), and a puncture needle (4a). One end of the puncture needle (4a) is fixed to the needle base (3a), and the puncture needle (4a) and the needle base (3a) are hollow structures in mutual communication, wherein the catheter assembly has a puncture state and an indwelling state. In the puncture state, the puncture needle (4a) is placed inside the indwelling catheter (2a); in the indwelling state, the puncture needle (4a) is placed inside the catheter hub (1a). In addition, the catheter assembly is converted from the puncture state to the indwelling state by means of retracting the needle base (3a). The medical catheter assembly can effectively prevent accidental injuries, and significantly lower risks in subsequent collection and processing of the medical catheter assembly.

Description

Puncture needle non-detachable medical trocar

Technical field

The present invention relates to the field of medical devices, and in particular to a puncture needle non-detachable medical trocar.

Background technique

Clinically, medical trocars are a widely used medical device. Taking a commonly used disposable intravenous infusion needle as an example, it is mainly composed of a cap, a steel needle, a needle seat, a needle wing, and a connecting tube.

When in use, the medical staff first removes the cap that is placed on the steel needle, and then uses a steel needle to perform venipuncture. See the blood return and confirm that the puncture is successful after the infusion. During the whole process of infusion, the steel needle stays in the blood vessel. However, because the needle tip of the steel needle is very sharp, the patient stretches the limb during the infusion, and the chance of puncturing the blood vessel by the steel needle is very large, especially for children and mental patients.

In addition, after the infusion needle is infused, the medical staff takes the steel needle out of the venous blood vessel of the human body, and the steel needle with the patient's blood is exposed outside, which may cause accidental injury and infection of the medical staff and the patient.

In addition, in the post-treatment of medical waste, there is also a risk that the steel needle will cause the operator to be infected.

Therefore, there is an urgent need in the art to develop medical trocars that are convenient to use and that can significantly reduce the risk of infection.

Summary of the invention

It is an object of the present invention to provide a medical trocar that is convenient to use and that significantly reduces the risk of infection.

In a first aspect of the invention, a puncture needle non-detachable medical trocar is provided, the trocar comprising:

a catheter seat;

An indwelling catheter disposed at a front end of the catheter hub;

a needle hub, the needle hub being located inside the catheter hub; and

a puncture needle, one end of the puncture needle is fixed to the needle seat, and the puncture needle and the needle seat are hollow structures that communicate with each other;

Wherein the trocar comprises a puncture state and an indwelling state; in the puncture state, the puncture needle is placed in the indwelling catheter; and in the indwelling state, the puncture needle is placed In the catheter hub, wherein the needle tip of the puncture needle is fully retracted into the catheter hub and is not in contact with the indwelling catheter;

And, the trocar is changed from the puncture state to the indwelling state by the withdrawal of the needle hub.

In another preferred embodiment, the trocar comprises an intravenous infusion needle, an arterial needle, and a nerve block needle.

In another preferred embodiment, the trocar further includes a withdrawal member for driving the needle holder for pulling, thereby causing the trocar to change from the puncture state to The indwelling state.

In another preferred embodiment, the withdrawal member includes a handle handle portion, a detachment portion, and optionally a needle shank connection portion between the handle handle portion and the detachment portion, wherein the The front end of the detaching portion is connected to the needle holder, and the needle holder can be driven to pull.

In another preferred embodiment, after the trocar is changed from the puncture state to the indwelling state, the detachment portion is disengaged from the needle hub, thereby causing the retraction member and the The other parts of the trocar are separated.

In another preferred embodiment, the handle handle portion is a flat structure.

In another preferred embodiment, the outer surface of the handle portion of the needle handle is provided with a bump to facilitate the pinching operation.

In another preferred embodiment, the needle handle portion also facilitates a puncture operation.

In another preferred embodiment, the withdrawal component is a needle wing.

In another preferred embodiment, the front end of the detachable portion is shaped to match the trailing end of the hub (ie, the front end of the detachable portion is intermeshing with the trailing end of the hub), thereby causing the The withdrawal member drives the needle holder back by the detachment portion and can cause the withdrawal member to fall off the needle holder.

In another preferred embodiment, the hub includes a head end portion, a middle portion, and a tail end portion that are sequentially connected;

The first end portion and the second portion are disposed on the outer surface of the tail end portion, and the detaching portion is closely attached to the tail end portion, and the front end of the detaching portion is provided with a third portion;

The third portion is matched with the first portion, and the third portion is matched with the first portion such that the third portion is tightly fitted to the end portion;

The first edge of the third portion and the second edge of the second portion are in close contact with each other such that the needle holder can be withdrawn by the withdrawal member.

In another preferred embodiment, the first portion is a first recessed portion, the second portion is a first raised portion, and the third portion is a second raised portion.

In another preferred embodiment, the outer surface of the head end portion is provided with an annular groove on one ring, and an elastic ring is disposed in the annular groove for realizing the between the needle seat and the catheter seat. Sealing.

In another preferred embodiment, the head end portion is provided with a sealing rubber plug to ensure a seal between the needle holder and the catheter holder in an indwelling state.

In another preferred embodiment, the detachment portion is further provided with an observation window structure for observing blood return.

In another preferred embodiment, the detaching portion is a circular arc structure (such as a 60-240° circular arc structure), and the inner surface thereof is a concave curved shape matching the shape of the outer surface of the needle seat and/or the extension tube. surface.

In another preferred embodiment, the viewing window structure is an elongated see-through hole provided in the detaching portion.

In another preferred embodiment, the needle hub is provided with a first through hole communicating with the inner passage of the puncture needle; and a second through hole is further disposed on the needle seat, the second through hole It is used to directly introduce the liquid into the inside of the catheter holder without the puncture needle; wherein, in the indwelling state, the first through hole and the second through hole constitute a conduction structure for the liquid to flow.

In another preferred embodiment, the number of the second through holes is n, wherein n is a positive integer of 1-20.

In another preferred embodiment, the n is 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.

In another preferred embodiment, the structures of the second through holes may be the same or different.

In another preferred embodiment, the opening of the second through hole in the catheter hub is a front end opening (ie, facing the indwelling catheter).

In another preferred embodiment, the opening of the second through hole in the catheter socket is a side opening (ie, forming an angle with the central axis of the catheter hub (eg, 20-90°, 60-120°, or 90-150). °)).

In another preferred embodiment, the inner passage of the puncture needle and the first through hole constitute a first passage for liquid to flow.

In another preferred embodiment, the trocar further includes an extension tube; and the extension tube is in communication with the needle holder at one end and the other end is for infusion into the needle holder.

In another preferred embodiment, the inner and/or outer surface of the catheter adapter is provided with a withdrawal guiding structure for guiding the withdrawal member and/or the needle holder for withdrawal.

In another preferred embodiment, the handle portion of the withdrawal member is further provided with a protrusion for guiding the withdrawal, and the outer surface of the catheter holder is provided with a groove matching the protrusion, The suckback member is pumped back by the cooperation of the protrusion and the groove.

In another preferred embodiment, the handle portion of the withdrawal member is further provided with a recess structure for guiding the withdrawal, and the outer surface of the catheter holder is provided with a rib matching the recess structure, The suckback member is pumped back by the interaction of the recessed structure and the rib.

In another preferred embodiment, the detaching portion of the withdrawal member is further provided with a protrusion for guiding the withdrawal, and the inner surface of the catheter seat is provided with a groove matching the protrusion, and the pumping is performed. The component is pumped back by the interaction of the protrusions and the grooves.

In another preferred embodiment, the detaching portion of the retracting member is provided with a recessed structure for guiding the retraction, and the inner surface of the catheter hub is provided with a rib matching the recessed structure, and the retracting member The pumping is performed by the interaction of the recessed structure and the ribs.

In another preferred embodiment, the withdrawal is a non-rotating withdrawal, a rotary withdrawal, or a combination thereof.

In another preferred embodiment, the needle hub is further provided with a protrusion for guiding the withdrawal, the inner surface of the catheter seat is provided with a groove matching the protrusion, and the pumping member passes the The protrusion and the groove cooperate to perform pumping back.

In another preferred embodiment, the needle hub is provided with a recessed structure for guiding the withdrawal, the inner surface of the catheter hub is provided with a rib matching the recessed structure, and the back pumping member passes through the recess Structure and ridge Mutual cooperation for back pumping.

In another preferred embodiment, the outer surface of the needle hub is provided with a first limiting structure; and the tail portion of the catheter socket is provided with a second limiting structure matched with the first limiting structure, thereby The needle holder catches the needle holder when it is pulled back to a predetermined position.

In another preferred embodiment, the predetermined position includes a position in which the needle hub is withdrawn back to the posterior portion of the catheter hub such that the puncture needle is all withdrawn back into the interior of the catheter adapter.

In another preferred embodiment, the first limiting structure is a protrusion and the second limiting structure is a recess.

In another preferred embodiment, the first limiting structure is an annular protrusion.

In another preferred embodiment, the second limiting structure is an annular groove.

In another preferred embodiment, the first limiting structure is a recess and the second limiting structure is a protrusion.

In another preferred embodiment, the first limiting structure and/or the second limiting structure are elastic structural members.

In another preferred embodiment, the first limiting structure includes a spring, and a spring hole disposed on the needle seat for accommodating the spring; when the needle holder is moved to a predetermined position, the spring Extend and enter the second limit structure to achieve the limit.

In another preferred embodiment, the trocar is further provided with a flap disposed adjacent the head end of the catheter hub and the flap is tightly engaged with the catheter adapter; and/or

The trocar is also provided with a cap that is external to the indwelling catheter.

In another preferred embodiment, the flap and the catheter hub are of unitary construction.

In another preferred embodiment, the outer diameter of the puncture needle is 15G-30G, preferably 18G, 20G, 22G, 24G, 26G, 28G.

In another preferred embodiment, the length of the indwelling catheter is from 1.0 to 15.0 cm, preferably from 1.5 to 5.0 cm, more preferably from 1.5 cm to 3 cm.

In another preferred embodiment, the catheter hub is transparent or non-transparent or partially transparent.

In a second aspect of the present invention, a safe intravenous infusion needle is provided, the infusion needle comprising an indwelling catheter, a catheter hub, a puncture needle and a needle hub;

Wherein, one end of the indwelling catheter is connected to the catheter hub, one end of the puncture needle is connected to the needle hub, and the puncture needle and the needle hub are hollow structures that communicate with each other, and the indwelling catheter includes a puncture state and Two indwelling states, and the indwelling state is obtained via a puncture state transition;

In the puncture state, the aforementioned puncture needle is placed in the indwelling catheter to serve as a support, and the outer indwelling catheter is guided by the tip of the puncture needle, and cooperates with each other to invade into the puncture physiological tissue;

In the indwelling state, the puncture needle is placed in the catheter hub;

And the indwelling state is formed by performing a withdrawal operation on the hub after experiencing the puncture state.

In another preferred embodiment, a luer connector is further provided corresponding to the aforementioned needle seat, and the Luer connector is connected and connected. The liquid tube, or the corresponding needle holder, the external infusion tube, or the infusion tube is arranged in an integrated manner corresponding to the above-mentioned needle holder.

In another preferred embodiment, the infusion needle is further provided with a needle wing, the tail end of the needle wing is provided with a buckle, the outer surface of the needle seat is further provided with a first card slot, and the first card The slot is matched with a tail catch of the pin, and the first slot is for snapping the tail of the pin into the first slot.

In another preferred embodiment, the needle wing is provided with a first groove that matches a side end of the catheter hub, the first groove for clamping the needle wing On the side end of the catheter hub.

In another preferred embodiment, the first surface of the needle hub is provided with two first card slots, the infusion needle is provided with two of the needle wings, and two of the first card slots and two The needles correspond to each other.

In another preferred embodiment, the first card slot has at least one beveled edge in the configuration for quickly detaching the pinion.

In another preferred embodiment, the puncture needle retracts into the interior of the catheter hub when the needle is pulled back.

In another preferred embodiment, the catheter seat is provided with a limiting structure, and the outer surface of the needle seat is provided with a second card slot on one ring, and the second card slot is opposite to the end of the limiting structure. In the indwelling state, the second card slot is combined with the end of the limiting structure for engaging the end of the limiting structure in the second card slot to fix the pin seat.

In another preferred embodiment, the outer surface of the needle seat is provided with a second groove on one of the rings, and the second groove is provided with an elastic ring for ensuring the sealing of the needle seat and the catheter seat. Sex.

In another preferred embodiment, a sealing structure is provided in the catheter hub to ensure the tightness of the catheter adapter in the indwelling state.

In another preferred embodiment, the infusion needle is further provided with a cap that is external to the indwelling catheter.

In another preferred embodiment, one end of the needle hub connected to the puncture needle is a puncture needle connection end, and a through hole is formed on the puncture needle connection end, and the through hole and the puncture needle constitute different infusions in the indwelling state. A conductive structure in the direction through which the infusion catheter is infused.

In another preferred embodiment, the puncture needle has an outer diameter of 15G-30G.

In another preferred embodiment, the indwelling catheter has a length of from 1.5 cm to 3 cm.

In another preferred embodiment, the catheter hub is transparent.

In a third aspect of the invention, a trocar puncture method is provided, comprising the steps of:

(a) providing the trocar of the first aspect, the trocar being in a puncture state;

(c) using the trocar in the puncture kit of the previous step to puncture the puncture site of the subject to be punctured; and

(d) after the puncture confirmation is successful, the needle holder of the trocar is subjected to a withdrawal operation to change the trocar from the puncture state to the indwelling state;

And the method further includes the step (b) of: connecting the trocar to a medical device;

Wherein step (b) is located between steps (a) and (c), and/or after step (d).

In another preferred embodiment, the medical device is selected from the group consisting of an infusion container, a pressure sensor, or a combination thereof.

In another preferred embodiment, the puncture site comprises tissue or blood vessels.

In another preferred embodiment, the successful confirmation of the puncture includes a return of blood at the puncture site.

A fourth aspect of the invention provides a trocar infusion method, comprising the steps of:

(a1) providing the trocar of the first aspect of the invention, the trocar being in a puncture state;

(b1) optionally connecting the trocar to the medical fluid through an extension tube to form an infusion set;

(c1) puncture the puncture site of the infusion subject using the cannula in the puncture kit of the previous step;

(d1) after the puncture confirmation is successful, the needle holder of the trocar is subjected to a withdrawal operation, thereby changing the trocar from the puncture state to the indwelling state;

(b2) optionally connecting the trocar to the medical fluid through an extension tube to form an infusion set;

(e1) performing an infusion;

Wherein the method includes at least one of steps (b1) and (b2).

In another preferred embodiment, the method comprises the step (b1); or the step (b2); or the steps (b1) and (b2).

In another preferred embodiment, the medical fluid comprises any liquid that can be medically and/or pharmaceutically acceptable.

It is to be understood that within the scope of the present invention, the various technical features of the present invention and the various technical features specifically described hereinafter (as in the embodiments) may be combined with each other to constitute a new or preferred technical solution. Due to space limitations, we will not repeat them here.

DRAWINGS

1 shows a puncture needle non-detachable medical trocar according to an embodiment of the present invention, wherein FIG. 1(a) is a puncture state, and FIG. 1(b) is a state in which the needle seat is retracted from a puncture state to the indwelling state. Fig. 1(c) shows the indwelling state (or the state at the time of infusion), at which time the retracting member has been detached.

2 is a schematic view showing the structure of a medical trocar according to an embodiment of the present invention.

3 is a schematic structural view of a needle hub in one embodiment of the present invention.

Figure 4 is a schematic view showing the structure of the front and back sides of the suckback member in one embodiment of the present invention.

FIG. 5 is a schematic structural view of a needle hub in an embodiment of the present invention.

Figure 6 is a schematic view showing the structure of a medical trocar according to an embodiment of the present invention.

Figure 7 is a schematic view showing the structure of a medical trocar according to an embodiment of the present invention.

Figure 8 is a schematic view showing the structure of a safe intravenous infusion needle according to an embodiment of the present invention.

Figure 9 is a schematic view showing the use of a safe intravenous infusion needle in one embodiment of the present invention.

Figure 10 is a schematic view showing the structure of a safe intravenous infusion needle according to an embodiment of the present invention.

detailed description

After extensive and intensive research, the inventors have for the first time developed a medical trocar with a non-detachable puncture needle and a self-cleaning function. The medical trocar has two states of puncture state and indwelling state. Wherein in the puncture state, the puncture needle is placed in the indwelling catheter to facilitate puncture; and in the indwelling state, the needle tip of the puncture needle is completely retracted into the catheter hub. In this way, during the infusion, the needle is completely left in the catheter hub, eliminating the risk of the patient being pierced by the steel needle; after the infusion, the risk of accidental injury and infection of the medical staff is eliminated. At the same time, since the medical trocar of the present invention has a self-cleaning function, the risk of subsequent recycling of the medical trocar is also significantly reduced. The present invention has been completed on this basis.

the term

As used herein, the term "puncture needle placed within a catheter adapter" means that the entirety of the needle is placed within the catheter adapter. In this state, the needle tip of the puncture needle is completely retracted into the catheter hub, and neither the needle body nor the needle tip of the puncture needle comes into contact with the indwelling catheter.

Trocar

The invention provides a medical trocar. The remarkable feature of the medical trocar is that the puncture needle is non-detachable, and the puncture needle can be completely retracted into the catheter hub. In addition, the medical trocar of the present invention also has a self-cleaning function of the puncture needle.

Typically, the trocar of the present invention comprises:

a catheter seat;

An indwelling catheter disposed at a front end of the catheter hub;

a needle hub, the needle hub being located inside the catheter hub; and

It should be understood that, unlike the prior art, in the indwelling state, the catheter hub is isolated from the outside except for the liquid inlet and the liquid outlet. In the indwelling state, a portion of the liquid flows into the catheter adapter through the second passage, a portion of the liquid flows into the catheter adapter through the first passage (as in the vicinity of the confluence region), and forms a confluence in the confluence region, and then flows into the tissue through the indwelling catheter (such as a human vein). ).

In the present invention, the trocar may include various types of medical trocars, particularly medical trocars that are used in the case where a liquid (such as a drug) needs to be input, a liquid sample (such as a blood sample) is collected, and the like. Representative examples include, but are not limited to, intravenous needles, arterial needles, and nerve blockers.

In order to facilitate the withdrawal of the needle holder, preferably, a withdrawal member may be provided for driving the needle holder for pulling, thereby causing the trocar to change from the puncture state to the Indwelling state.

Typically, the retraction member includes a handle handle portion, a detachment portion, and optionally a needle shank connection between the handle handle portion and the detachment portion, wherein the front end of the detachment portion is The needle holder is connected and can drive the needle holder for pulling.

It should be understood that the structure and shape of the retracting member and its constituent members (handle handle portion, detachment portion, connecting portion) are not particularly limited, and mainly, it is possible to realize the withdrawal of the needle holder, thereby causing the trocar to be punctured from the puncture state. It is sufficient to change to the indwelling state.

In the present invention, the shape of the handle portion of the needle handle is also not particularly limited, and various conventional shapes such as a flat shape may be employed. The handpiece can also be a raised portion that is perpendicular to the catheter hub to accommodate clinically different manipulations. A preferred handle handle portion is a flat structure. In addition, the outer surface of the handle portion of the needle handle may be provided with a bump to facilitate the pinching operation.

Preferably, the withdrawal component is detachable after completion of the withdrawal. For example, the front end of the detachment portion of the withdrawal member is shaped to match the tail end of the needle holder (ie, the front end of the detachment portion is intermeshing with the tail end of the needle holder), thereby allowing the withdrawal member to pass The detaching portion drives the needle holder to withdraw and can cause the sucking member to fall off the needle seat.

In the present invention, the inner surface and/or the outer surface of the catheter hub is provided with a withdrawal guiding structure, which can guide the withdrawal member and/or the needle holder for withdrawal, preferably the withdrawal is non-rotating. Pumping. The withdrawal guiding structure may be disposed inside the catheter hub, the handle handle portion, the detachment portion, and/or the needle hub.

Preferably, the handle portion of the withdrawal member is further provided with a protrusion for guiding the withdrawal, and the outer surface of the catheter holder is provided with a groove matching the protrusion, and the pumping member passes The protrusion and the groove cooperate to perform pumping back.

In the present invention, one of the main functions of the needle hub is to secure the puncture needle so that when the needle hub is retracted, the puncture needle is fully retracted into the catheter hub. Another main function of the needle hub is to provide two or more passages for the flow of the liquid, wherein at least the first passage (formed by the first through hole on the needle seat and the inner passage of the puncture needle) and the second passage (by The second through hole is formed). Another major function of the hub is to seal the infusion in the catheter adapter.

Since the trocar (including the infusion needle) of the present invention is provided with two or more passages, the infusion speed of the present invention is greater than the speed at which the infusion is performed only through the internal passage of the puncture needle in the conventional infusion.

In the present invention, a preferred needle hub includes a head end portion, a middle portion and a tail end portion which are sequentially connected; wherein a first portion and a second portion are provided on an outer surface of the tail end portion, and The detaching portion is closely attached to the tail end portion, and the front end of the detaching portion is provided with a third portion; the third portion is matched with the first portion, and the third portion and the first portion are Cooperating such that the third portion is tightly fitted to the end portion; the first edge of the third portion and the second edge of the second portion are closely adhered to each other, so that the needle holder can The pumping member is rewound, for example, the first portion is a first recessed portion, the second portion is a first raised portion, and the third portion is a second raised portion.

Preferably, the outer surface of the head end portion is provided with an annular groove on one ring, and an elastic ring is disposed in the annular groove for achieving the sealing between the needle seat and the catheter seat. Alternatively, the head end portion is provided with a sealing rubber plug to ensure a seal between the needle seat and the catheter seat in an indwelling state.

In addition, in order to prevent the needle hub from being withdrawn from the catheter hub during withdrawal, a corresponding limiting structure may preferably be provided. In another preferred embodiment, the outer surface of the needle hub is provided with a first limiting structure; the tail portion of the catheter socket is provided with a second limiting structure matched with the first limiting structure, thereby The needle seat is caught when the needle seat is pulled back to the predetermined position. In this way, when the retracting member pulls back the puncture needle, the first limiting structure is combined with the second limiting structure, and the first limiting structure can be buckled in the second limiting structure. Thereby the needle hub is fixed such that the needle hub is not pulled out of the catheter hub.

In another preferred embodiment, the first limiting structure is a protrusion, and the second limiting structure is a recess; for example, the first limiting structure is an annular protrusion; and the second limiting position The structure is a circular groove. Alternatively, the first limiting structure is a recess and the second limiting structure is a protrusion.

In addition, the first limiting structure and/or the second limiting structure may also be elastic structural members. For example, the first limiting structure includes a spring, and a spring disposed on the needle seat for accommodating the spring a hole; when the needle seat is moved to a predetermined position, the spring is elongated and enters the second limit structure to achieve the limit.

In the present invention, the specification of the puncture needle is not particularly limited, and the outer diameter (or specification) of the representative puncture needle is 15G to 30G, preferably 18G, 20G, 22G, 24G, 26G, and 28G.

In another preferred embodiment, the length of the indwelling catheter is not particularly limited, and it generally depends on the application of the trocar. Typically, the length of the indwelling catheter is from 1.0 to 15.0 cm, preferably from 1.5 to 5.0 cm, more preferably from 1.5 cm to 3 cm.

In the present invention, the size of the catheter hub is not particularly limited, but should be sufficient to accommodate the puncture needle, that is, the length of the catheter hub should be greater than the length of the puncture needle. Usually, the ratio L1/L2 of the lumen length L1 of the catheter hub to the length L2 of the puncture needle is 1.02-2, preferably 1.05-1.5, more preferably 1.1-1.4. Typically, the length of the catheter hub or the lumen thereof is from 1 to 15 cm, preferably from 1.5 to 10 cm, more preferably from 2 to 5 cm. In the present invention, the inner diameter of the catheter hub is slightly larger than the outer diameter of the puncture needle. Typically, the catheter hub has an inner diameter of from 0.2 to 2 cm, preferably from 0.3 to 1.5 cm, more preferably from 0.4 to 1.0 cm. The wall thickness of the catheter hub is not particularly limited and is usually 0.02 to 8 mm, preferably 0.1 to 5 mm.

In the present invention, the material of the catheter hub is not particularly limited, and is usually plastic, especially a hard plastic material. In addition, the catheter hub is preferably transparent or non-transparent or partially transparent for viewing blood return and infusion.

Further, in order to facilitate the observation of blood return, an observation window structure for observing blood return may be provided in the detachment portion.

It will be appreciated that with the trocar of the present invention, one or more infusion containers can be accessed at the rear end. For example, a plurality of infusion containers can be in communication with the trocar of the present invention through a "Y" type joint and an extension tube to perform infusion simultaneously or sequentially.

In the present invention, in the indwelling state, the tip of the puncture needle located in the catheter hub faces the liquid inlet of the indwelling catheter, and an infusion confluence zone is formed between the needle tip of the puncture needle and the liquid inlet of the indwelling catheter. In the confluence zone, the liquid flowing from the puncture needle (i.e., from the first passage) forms a confluence with the liquid flowing out of the second through hole (i.e., from the second passage) and enters the indwelling conduit. Since the liquid flow rate in the confluence zone is increased, the cleaning of the needle tip (self-cleaning) is better, which greatly reduces the risk of subsequent recovery of the medical trocar.

Intravenous infusion needle

The invention also provides a safe intravenous infusion needle, which comprises an indwelling catheter, a catheter socket, a puncture needle and a needle holder;

Wherein, one end of the indwelling catheter is connected to the catheter hub, one end of the puncture needle is connected to the needle hub, and the puncture needle and the needle hub are hollow structures that communicate with each other, and the indwelling catheter includes a puncture Both state and indwelling states, and the indwelling state is obtained via a puncture state transition;

In the indwelling state, the puncture needle is placed in the catheter hub;

In another preferred embodiment, a luer connector is provided corresponding to the aforementioned needle hub, and the Luer connector is connected to the infusion tube, or the needle hub is externally connected, the external infusion tube is connected, or the aforementioned needle hub is integrated. Set the infusion tube.

In another preferred embodiment, the catheter seat is provided with a limiting structure, and the outer surface of the needle seat is provided with a second card slot on one ring, and the second card slot is opposite to the end of the limiting structure. In the matching, in the indwelling state, the second card slot is combined with the end of the limiting structure for engaging the end of the limiting structure in the second card slot to fix the pin seat.

In another preferred embodiment, the infusion needle is further provided with a detachable cap for protecting the puncture needle and the indwelling catheter.

In another preferred embodiment, the catheter hub is transparent.

Puncture method

The invention also provides a trocar puncture method, comprising the steps of:

(a) providing a trocar of the present invention, the trocar being in a puncture state;

Wherein step (b) is located between steps (a) and (c), and/or after step (d).

In the present invention, a medical device that can be coupled to a trocar of the present invention is not limited, and a representative medical device is selected from the group consisting of an infusion container, a pressure sensor, or a combination thereof.

Infusion method

The invention also provides a trocar infusion method, comprising the steps of:

(a1) providing a trocar of the present invention, the trocar being in a puncture state;

(e1) performing an infusion;

Wherein the method includes at least one of steps (b1) and (b2).

In the present invention, the puncture needle, the indwelling catheter, the needle hub and the catheter hub are integrated during infusion.

Preferably, said step (d1) comprises the substeps:

(d11) After the puncture confirmation is successful, the hand pull back part drives the needle seat to slide back to the needle seat and is stuck in the catheter The tail of the seat;

(d12) The returning member is detached from the needle holder.

In the present invention, typical puncture sites include, but are not limited to, tissue or blood vessels.

It should be understood that the medical fluid to be infused by the method of the present invention is not particularly limited and includes any liquid which can be medically and/or medicinally, such as physiological saline with or without added drugs, a glucose solution or the like.

The main advantages of the invention include:

(a) The trocar is provided with a retracting member, and after the puncture is successful, the retracting member can be pulled back to completely retract the puncture needle into the inside of the catheter seat, ensuring that the needle does not puncture the blood vessel during the infusion, thereby reducing the patient's Fear, and in the process of infusion, you can properly stretch your limbs, get rid of the rigid posture of the original infusion, and improve the safety of infusion.

(b) the needle hub is provided with a first through hole communicating with the inner passage of the puncture needle, and the second through hole is further disposed on the needle seat, the first through hole and the first through hole in the indwelling state The two-way holes constitute a conduction structure in different infusion directions, increase the liquid flow rate, and form a confluent zone that contributes to the self-cleaning effect.

(c) The inner surface and the outer surface of the catheter hub are provided with a withdrawal guiding structure, which can guide the withdrawal member and the needle holder to perform withdrawal to prevent rotational displacement.

(d) The trocar is provided with a stop structure such that the needle holder is not pulled out of the catheter hub, so that the puncture needle remains in the catheter hub. In this way, the puncture needle with the patient's blood is effectively prevented from being exposed outside, and no accidental injury or infection to the medical staff and the patient is caused, thereby providing a safe and safe working environment for the medical worker.

(e) The tip end portion of the hub is provided with a sealing rubber plug to ensure the sealing between the hub and the catheter holder in the indwelling state.

(f) When the trocar is in an indwelling state, the puncture needle is placed in the catheter hub, and the puncture needle (including the inner cavity and the outer surface) is simultaneously cleaned while infusion into the catheter hub. Thus, after the infusion, the needle and the catheter hub are very clean, which greatly reduces the risk of subsequent recycling of the medical trocar.

(g) The detachment portion is further provided with an observation window structure for facilitating observation of blood return.

The invention is further illustrated below in conjunction with specific embodiments. It is to be understood that the examples are not intended to limit the scope of the invention. The experimental methods in the following examples which do not specify the specific conditions are usually in accordance with conventional conditions or according to the conditions recommended by the manufacturer. Unless otherwise stated, percentages and parts are by weight and parts by weight.

It should be noted that in the claims and the specification of the present patent, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, without necessarily requiring or Imply that there is any such actual relationship or order between these entities or operations. And Also, the terms "comprises" or "comprising" or "comprising" or any other variations are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a" does not exclude the presence of the same element in the process, method, item, or device that comprises the element.

Example 1

Medical trocar

As shown in FIG. 1-2, the puncture needle non-detachable medical trocar of the embodiment includes:

a catheter hub 1a;

An indwelling catheter 2a, the indwelling catheter 2a being disposed at a front end of the catheter hub 1a;

a needle holder 3a, the needle holder 3a being located inside the catheter hub 1a;

A puncture needle 4a, one end of the puncture needle 4a is fixed to the needle hub 3a, and the puncture needle 4a and the needle hub 3a are hollow structures that communicate with each other.

The trocar includes a puncture state and a retention state. In the puncture state, the puncture needle 4a is placed in the indwelling catheter 2a (as shown in Fig. 1(a)). The trocar is changed from the puncture state to the indwelling state by the withdrawal of the needle hub 3a. In the indwelling state, the puncture needle 4a is placed in the catheter hub 1a, wherein the needle tip of the puncture needle 4a is completely retracted into the catheter hub 1a, and the indwelling catheter 2a is not Contact (as shown in Figure 1 (b)).

In this embodiment, the trocar further includes a retracting member 5a for driving the needle holder 3a to pull, thereby changing the trocar from the puncture state. For the indwelling state. The retracting member 5a includes a needle grip portion 6a, a detaching portion 7a, and a needle shank connecting portion 8a between the needle grip portion 6a and the detaching portion 7a, wherein the front end of the detaching portion 7a It is connected to the hub 3a and can drive the needle holder 3a for pulling.

When the trocar is changed from the puncture state to the indwelling state, the detaching portion 7a is disengaged from the needle hub 3a, thereby causing the retracting member 5a and the trocar The other parts are separated (as shown in Figure 1(c)).

In the embodiment, the needle handle portion 6a is a flat structure, and the needle handle portion 6a is also convenient for performing a puncture operation.

The front end of the detaching portion 7a is shaped to match the tail end of the needle holder 3a (ie, the front end of the detaching portion 7a and the tail end of the needle holder 3a are intermeshing), so that the ejector member The needle holder 3a is pulled back by the detaching portion 7a and the retracting member 5a can be detached from the needle holder 3a.

When performing infusion, as shown in FIG. 2, the trocar further includes an extension tube 16a, and One end of the extension tube 16a communicates with the needle holder 3a, and the other end is used for infusion into the needle holder 3a, and the extension tube 16a is externally connected with a "Y" type joint 17a for infusion.

The trocar is further provided with a flap 9a which is disposed near the head end of the catheter hub 1a and which is tightly engaged with the catheter hub 1a.

Example 2

Medical trocar

The embodiment provides a puncture needle non-detachable medical trocar. The trocar in this embodiment is improved on the basis of the trocar of the embodiment 1. The main improvement is as follows:

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in the present embodiment, the hub 3a includes a head end portion 10a, a middle portion 11a and a tail end portion 12a which are sequentially connected;

The first end portion 13a and the second portion 24a are disposed on the outer surface of the tail end portion 12a, and the detaching portion is closely attached to the end portion 12a, and the front end of the detaching portion is provided with a third portion 25a; the third portion 25a is matched with the first portion 13a, and the third portion 25a is matched with the first portion 13a such that the third portion 25a is closely related to the tail portion 12a The first edge 26a of the third portion 25a and the second edge 27a of the second portion 24a are in close contact with each other, so that the needle holder can be sucked back by the pumping member, for example In this embodiment, the first portion 13a is a first recessed portion, the second portion 24a is a first raised portion, and the third portion 25a is a second raised portion;

The head end portion 10a is provided with a sealing rubber stopper 20a to ensure the sealing property between the needle holder 3a and the catheter seat 1a in an indwelling state;

The outer surface of the handle portion 6a of the needle handle is provided with a bump to facilitate the pinching operation;

The detaching portion 7a is further provided with an observation window structure 23a for observing blood return, and the observation window structure 23a is an elongated see-through hole provided in the detaching portion 7a.

Example 3

Needle seat and medical trocar

This embodiment describes a preferred hub and a medical trocar that employs the hub.

Similar to Embodiment 1, this embodiment employs a medical trocar having the hub shown in FIG. 5, including:

a catheter seat;

An indwelling catheter disposed at a front end of the catheter hub;

a needle holder 3a, the needle holder 3a being located inside the catheter holder; and

a puncture needle, one end of the puncture needle is fixed to the needle hub 3a, and the puncture needle and the needle hub 3a are hollow structures that communicate with each other;

Wherein the trocar comprises a puncture state and an indwelling state; in the puncture state, the The puncture needle is placed in the indwelling catheter; the trocar is changed from the puncture state to the indwelling state by the withdrawal of the needle hub 3a. In the indwelling state, the puncture needle is placed in the catheter hub, wherein the needle tip of the puncture needle is completely retracted into the catheter hub and is not in contact with the indwelling catheter;

As shown in Fig. 5, the needle hub 3a is provided with a first through hole 21a that communicates with the inner passage of the puncture needle. The inner passage of the puncture needle and the first through hole 21a constitute a first passage for liquid to flow.

In addition, the needle seat 3a is further provided with a second through hole 22a for directly introducing the liquid into the inside of the catheter seat without the puncture needle.

In the indwelling state, the first through hole 21a and the second through hole 22a constitute a conduction structure for liquid to flow.

In this embodiment, the number of the second through holes 22a is one (may be two or three or more). Further, although the structure of the second through holes 22a is the same, the structure of the second through holes 22a may be different.

The opening of the second through hole 22a in the catheter hub is toward the indwelling catheter.

Example 4

Medical trocar

As shown in FIG. 6, the embodiment provides a puncture needle non-detachable medical trocar, the trocar comprising:

a catheter hub 1a;

The trocar includes a puncture state and an indwelling state; in the puncture state, the puncture needle 4a is placed in the indwelling catheter 2a; the trocar is pulled back through the needle hub 3a From the puncture state to the indwelling state. In the indwelling state, the puncture needle 4a is placed in the catheter hub 1a, wherein the needle tip of the puncture needle 4a is completely retracted into the catheter hub 1a, and the indwelling catheter 2a is not contact.

In this embodiment, the trocar further includes a retracting member 5a for driving the needle holder 3a to pull, thereby changing the trocar from the puncture state. For the indwelling state.

The retracting member 5a includes a needle grip portion 6a, a detaching portion 7a, and a needle shank connecting portion 8a between the needle grip portion 6a and the detaching portion 7a, wherein the front end of the detaching portion 7a It is connected to the hub 3a and can drive the needle holder 3a for pulling.

In this embodiment, the inner surface and the outer surface of the catheter hub 1a are provided with a withdrawal guiding structure for guiding the withdrawal member 5a and the needle holder 3a for pumping back, and the pumping back is non-rotating pumping. .

The handle portion 6a of the withdrawal member 5a is further provided with a protrusion 18a for guiding the withdrawal, and the outer surface of the catheter holder 1a is provided with a groove 19a matching the protrusion 18a, the back The pumping member 5a is sucked back by the cooperation of the projection 18a and the recess 19a.

The detaching portion 7a of the retracting member 5a is provided with a recessed structure for guiding the retraction, and the inner surface of the catheter hub 1a is provided with a rib matching the recessed structure, and the retracting member 5a passes the The concave structure and the ridges cooperate to perform pumping back.

Example 5

Medical trocar

As shown in FIG. 7, the puncture needle non-detachable medical trocar of the present embodiment includes:

a catheter hub 1a;

a puncture needle 4a, one end of the puncture needle 4a is fixed to the needle hub 3a, and the puncture needle 4a and the needle hub 3a are hollow structures that communicate with each other;

Wherein the trocar comprises a puncture state and an indwelling state; in the puncture state, the puncture needle 4a is placed in the indwelling catheter 2a; the trocar passes through the needle hub 3a Retraction, transitioning from the puncture state to the indwelling state. In the indwelling state, the puncture needle 4a is placed in the catheter hub 1a, wherein the needle tip of the puncture needle 4a is completely retracted into the catheter hub 1a, and the indwelling catheter 2a is not contact;

In this embodiment, the first limiting structure 14a is disposed on the outer surface of the needle holder 3a.

The tail portion of the catheter hub 1a is provided with a second stopper structure 15a that matches the first stopper structure 14a, so that the needle hub 3a is caught when it is pulled back to a predetermined position.

The predetermined position is a position at which the needle hub 3a is sucked back to the rear of the catheter hub 1a so that the puncture needle 4a is all pulled back to the inside of the catheter hub 1a.

In this embodiment, the first limiting structure 14a is a protrusion, and the second limiting structure 15a is a recess.

In the present embodiment, the outer diameter of the puncture needle 4a is 26 G, the length of the indwelling catheter 2a is 4 cm, and the catheter hub 1a is transparent.

Example 6

Safe intravenous infusion needle

As shown in FIG. 8, the present embodiment provides a safe type intravenous infusion needle including an indwelling catheter 1, a catheter hub 2, a puncture needle 3, and a needle hub 4.

One end of the indwelling catheter 1 is connected to the catheter hub 2, one end of the puncture needle 3 is connected to the needle hub 4, and the puncture needle 3 and the needle hub 4 are hollow structures that communicate with each other. The indwelling catheter 1 includes both a puncture state and an indwelling state, and the indwelling state is obtained via a puncture state transition.

In the puncture state, the aforementioned puncture needle 3 is placed in the indwelling catheter 1 to support, and the outer indwelling catheter 1 is guided by the tip of the puncture needle 3, and cooperates with each other to invade into the puncture physiological tissue. .

In the indwelling state, the puncture needle 3 is placed in the catheter hub 2.

And the indwelling state is formed by performing a pumping operation on the needle hub 4 after experiencing the puncture state.

In the present embodiment, the infusion tube 5 is provided in an integrated manner corresponding to the aforementioned needle hub 4.

The catheter seat 2 is provided with a limiting structure 9.

a second card slot 10 is disposed on the outer surface of the needle hub 4, and the second card slot 10 is matched with the end of the limiting structure 9, the second card slot 10 and the limit The ends of the bit structure 9 are combined for snapping the end of the limiting structure 9 into the second card slot 10 to secure the hub 4.

The infusion needle is further provided with a needle wing 6. The tail end of the needle wing 6 is provided with a buckle, and the outer surface of the needle holder 4 is further provided with a first card slot 8 and the first card slot 8 and The tail buckles of the needles 6 are matched, and the first card slot 8 is used for snapping the tail of the needle wing 6 into the first card slot 8.

The needle wing 6 is provided with a first groove 7 that matches the side end of the catheter hub 2, the first groove 7 being used to clamp the needle wing 6 On the side end of the catheter hub 2.

In use, as shown in FIG. 9, when the needle blade 6 is pulled back, the puncture needle 3 is retracted to the inside of the catheter hub 2.

In this embodiment, when used, the hand pinching needle 6 performs venipuncture. After seeing the blood returning and puncture successfully, the needle wing 6 is pulled back and the indwelling catheter 1 is simultaneously pushed, and the puncture needle 3 is retracted into the inside of the catheter seat 2, at this time limit. The position structure 9 will be inserted into the second card slot 10 on the needle holder 4 to realize the action of the fixed needle seat 4, and the needle wing 6 will be naturally detached from the first card slot 8, and then the liquid in the infusion tube 5 passes through the needle. The infusion-conducting structure formed by the seat 4 and the puncture needle 3 is infused into the indwelling catheter 1.

In this embodiment, the outer surface of the needle hub 4 is provided with a second card slot 10 matching the end of the limiting structure 9 in a circle, which can ensure that the limit is fixed when the needle hub 4 is rotated. The end of the structure 9 can be snapped into any one of the second slots 10 on one of the outer surfaces of the hub 4, thereby ensuring that the hub 4 is not pulled out.

Example 7

Safe intravenous infusion needle

As shown in Fig. 10, the safe intravenous infusion needle of the present embodiment is basically the same as that of the embodiment 6, except that the following improvements are further made:

(a) the outer surface of the needle hub 4 is further provided with a second groove (not shown), and an elastic ring 11 is disposed in the second groove for ensuring the needle seat 4 The sealing property with the catheter hub 2.

(b) The infusion needle is further provided with a cap (not shown) provided on the nozzle of the indwelling catheter 1.

(c) one end of the needle hub 4 connected to the puncture needle 3 is a puncture needle connection end, and a through hole (not shown) is provided at the connection end of the puncture needle 3, and the through hole is in the indwelling state. And the puncture needle 3 constitutes a conduction structure in different infusion directions, and infusion into the indwelling catheter 1 prevents the entire liquid from being transported to the indwelling catheter 1 in a single direction, thereby increasing the liquid flow rate.

(d) The first card slot 8 is constructed to include at least one beveled edge for quickly detaching the pinion 6.

In this embodiment, when in use, the protective cap (not shown) is first taken, and the puncture needle 3 is punctured into the blood vessel. After the puncture is successful, the hand pinching the needle 6 is pulled back, and when pulled to a certain position, the catheter is pulled. The limiting structure 9 on the seat 2 will be caught on the second card slot 10 of the needle seat 4, and the needle wing 6 will also be detached from the first card slot 8, and the puncture needle 3 will be returned to the inside of the catheter socket 2 at this time. It can be ensured that the puncture needle will not puncture the blood vessel during the infusion process, and the intravenous infusion needle is pulled out after the infusion, and the puncture needle 3 is still in the catheter hub 2, and then the through hole (not shown) and the puncture needle 3 The conduction structure constituting the different infusion directions is subjected to an infusion operation to the indwelling catheter 1, so that the entire liquid can be prevented from being transported to the indwelling catheter 1 in a single direction, increasing the liquid flow rate.

In this embodiment, the outer surface of the needle hub 4 may further be provided with a second groove (not shown), and the second groove is provided with an elastic ring 11 to ensure the The sealing property of the hub 4 to the catheter hub 2.

Example 8

Safe intravenous infusion needle

The safe intravenous infusion needle of this embodiment is basically the same as that of the embodiment 7, except that the following improvements exist:

(1) two outer first surfaces of the needle hub are provided, the infusion needle is provided with two of the needle wings, and two of the first card slots and two of the needles are The wings correspond to each other;

(2) the outer diameter of the puncture needle is 15-30G;

(3) the length of the indwelling catheter is 1.5 cm - 3 cm;

(4) The catheter hub is transparent.

For example, the puncture needle has an outer diameter of 24 G and the catheter has a length of 2.5 cm.

In this embodiment, two of the first card slots and two of the needles paired therewith may be provided, which may be used as one to increase the service life of the intravenous infusion needle.

Example 9

Intravenous infusion method

This embodiment provides a trocar infusion method, comprising the steps of:

(a1) providing the trocar of embodiment 1, the trocar being in a puncture state;

(b1) connecting the trocar through the extension tube to the medical fluid to form an infusion set;

(c1) puncture the puncture site of the puncture and infusion subject using the cannula in the (b1) puncture kit;

(d1) after the puncture confirmation is successful, the trocar is adjusted to a state of indwelling;

(e1) Infusion.

When infusion, the puncture needle, indwelling catheter, needle hub and catheter hub are integrated.

In this embodiment, the step (d1) includes the substeps:

(d11) After the puncture confirmation is successful, the hand-held pumping member drives the needle holder to slide backward until the needle seat is caught at the tail of the catheter seat;

(d12) The returning member is detached from the needle holder.

In this embodiment, blood return occurs at the puncture site to confirm that the puncture is successful.

In this embodiment, the medical liquid is a medicinal liquid.

Example 10

Intravenous infusion method

This embodiment provides a trocar infusion method, comprising the steps of:

(a1) providing the trocar of embodiment 1, and the trocar is in a puncture state;

(c1) puncture the puncture site of the puncture and infusion subject using the cannula in (a1);

(b2) being connected to the medical fluid through the extension tube through the trocar in the indwelling state in (d1);

(e1) Infusion.

In this embodiment, the step (d1) includes the substeps:

(d12) The returning member is detached from the needle holder.

All documents mentioned in the present application are hereby incorporated by reference in their entirety in their entireties in the the the the the the the the In addition, it should be understood that various modifications and changes may be made by those skilled in the art in the form of the appended claims.

Claims

A puncture needle non-detachable medical trocar, characterized in that the trocar comprises:

a catheter seat;

An indwelling catheter disposed at a front end of the catheter hub;

a needle hub, the needle hub being located inside the catheter hub; and

a puncture needle, one end of the puncture needle is fixed to the needle seat, and the puncture needle and the needle seat are hollow structures that communicate with each other;

Wherein the trocar comprises a puncture state and an indwelling state; in the puncture state, the puncture needle is placed in the indwelling catheter; and in the indwelling state, the puncture needle is placed In the catheter hub, wherein the needle tip of the puncture needle is fully retracted into the catheter hub and is not in contact with the indwelling catheter;

And, the trocar is changed from the puncture state to the indwelling state by the withdrawal of the needle hub.
The trocar of claim 1 wherein said trocar comprises an intravenous infusion needle or an arterial needle or a nerve blocker.
The trocar of claim 1 wherein said trocar further comprises a withdrawal member for urging said needle holder for extraction such that said sleeve The needle transitions from the puncture state to the indwelling state.
A trocar according to claim 3, wherein said withdrawal member comprises a needle handle portion, a detachment portion, and optionally a needle positioned between said needle handle portion and said detachment portion The handle connecting portion, wherein the front end of the detaching portion is connected to the needle holder, and the needle holder can be driven to pull.
The trocar according to claim 1, wherein the needle hub is provided with a first through hole communicating with an inner passage of the puncture needle; and a second passage is further provided on the needle seat a hole for directly introducing the liquid into the inside of the catheter holder without the puncture needle; wherein, in the indwelling state, the first through hole and the second through hole constitute a conduction structure for the liquid to flow.
The trocar of claim 1 wherein said trocar further comprises an extension tube; and wherein said extension tube is in one end in communication with said needle holder and the other end is adapted for infusion into said needle holder .
A trocar according to claim 4, wherein the inner surface and/or the outer surface of the catheter hub is provided with a withdrawal guiding structure for guiding the withdrawal member and/or the needle holder for withdrawal .
The trocar according to claim 7, wherein the handle portion of the withdrawal member is further provided with a protrusion for guiding the withdrawal, and the outer surface of the catheter holder is provided with the protrusion The matching groove is retracted by the interaction of the protrusion and the groove.
The trocar according to claim 1, wherein a first limiting structure is disposed on an outer surface of the needle seat; and a tail portion of the catheter seat is provided to match the first limiting structure. The second limiting structure causes the needle hub to catch the needle seat when it is pulled back to the predetermined position.
The trocar of claim 9, wherein the first limiting structure is a protrusion and the second limiting structure is a recess.
The trocar of claim 1 wherein said hub includes a head end portion, a middle portion and a tail portion that are sequentially connected;

The first end portion and the second portion are disposed on the outer surface of the tail end portion, and the detaching portion is closely attached to the tail end portion, and the front end of the detaching portion is provided with a third portion;

The third portion is matched with the first portion, and the third portion is matched with the first portion such that the third portion is tightly fitted to the end portion;

The first edge of the third portion and the second edge of the second portion are in close contact with each other such that the needle holder can be withdrawn by the withdrawal member.
A trocar according to claim 11, wherein said head end portion is provided with a sealing rubber stopper to ensure a seal between said needle holder and said catheter holder in an indwelling state.
A safe intravenous infusion needle, characterized in that the infusion needle comprises an indwelling catheter, a catheter socket, a puncture needle and a needle holder;

Wherein, one end of the indwelling catheter is connected to the catheter hub, one end of the puncture needle is connected to the needle hub, and the puncture needle and the needle hub are hollow structures that communicate with each other, and the indwelling catheter includes a puncture state and Two indwelling states, and the indwelling state is obtained via a puncture state transition;

In the puncture state, the aforementioned puncture needle is placed in the indwelling catheter to serve as a support, and the outer indwelling catheter is guided by the tip of the puncture needle, and cooperates with each other to invade into the puncture physiological tissue;

In the indwelling state, the puncture needle is placed in the catheter hub;

And the indwelling state is formed by performing a withdrawal operation on the hub after experiencing the puncture state.
A trocar puncture method, comprising the steps of:

(a) providing the trocar of claim 1 in a puncture state;

(c) using the trocar in the puncture kit of the previous step, the puncture site of the object to be punctured Piercing; and

(d) after the puncture confirmation is successful, the needle holder of the trocar is subjected to a withdrawal operation to change the trocar from the puncture state to the indwelling state;

And the method further includes the step (b) of: connecting the trocar to a medical device;

Wherein step (b) is located between steps (a) and (c), and/or after step (d).
A trocar infusion method, comprising the steps of:

(a1) providing the trocar of claim 1, the trocar being in a puncture state;

(b1) optionally connecting the trocar to the medical fluid through an extension tube to form an infusion set;

(c1) puncture the puncture site of the infusion subject using the cannula in the puncture kit of the previous step;

(d1) after the puncture confirmation is successful, the needle holder of the trocar is subjected to a withdrawal operation, thereby changing the trocar from the puncture state to the indwelling state;

(b2) optionally connecting the trocar to the medical fluid through an extension tube to form an infusion set;

(e1) performing an infusion;

Wherein the method includes at least one of steps (b1) and (b2).