CN207545559U - Safety-type medical trocar with multichannel infusion channel - Google Patents

Abstract

The utility model discloses a safe medical trocar with multiple transfusion channels, which comprises: a catheter seat, an indwelling catheter, a needle seat 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 connected to each other; wherein, the trocar includes 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 In the state, the puncture needle is placed in the catheter base; and, the trocar changes from the puncture state to the indwelling state by withdrawing the needle base; the needle base is provided with a first through hole that communicates with the inner channel of the puncture needle The needle seat is also provided with a second through hole, the second through hole is used to directly introduce the liquid into the catheter seat without passing through the puncture needle; wherein, in the indwelling state, the first through hole and the second through hole constitute a supply Conductive structure for liquid flow. The medical trocar of the utility model can not only effectively prevent accidental injury, but also significantly reduce the risk of subsequent recycling of the medical trocar.

Description

Safety medical trocar with multiple infusion channels

technical field

The utility model relates to the field of medical instruments, in particular to a safe medical trocar with multiple infusion channels.

Background technique

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

When in use, the medical staff first removes the protective cap covering the steel needle, and then uses the steel needle to perform venous blood vessel puncture, sees blood return and performs infusion after confirming that the puncture is successful. During the whole process of infusion, the steel needle remains in the blood vessel. However, because the needle tip of the steel needle is very sharp, the patient stretches his limbs during the infusion, and the probability of the blood vessel being punctured by the steel needle is very high, especially for children and mental patients.

In addition, after the infusion of the infusion needle is completed, the medical staff pulls out the steel needle from the vein of the human body, and the steel needle stained with the patient's blood is exposed outside, which may easily cause accidental injury and infection of the medical staff and the patient.

In addition, when the medical waste is reprocessed, the steel needle also has the risk of causing the operator to be infected.

Therefore, there is an urgent need in this field to develop a medical trocar that is easy to use and can significantly reduce the risk of infection.

Utility model content

The purpose of the utility model is to provide a medical trocar which is easy to use and can significantly reduce the risk of infection.

In the first aspect of the utility model, a safety medical trocar with multiple infusion channels is provided, and the trocar includes:

a catheter socket;

an indwelling catheter, the indwelling catheter is arranged at the front end of the catheter adapter;

a needle hub 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 communicating with each other.

Wherein, the trocar includes 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 adapter, wherein the needle tip of the puncture needle is fully retracted into the catheter adapter and does not contact the indwelling catheter.

In addition, the trocar changes from the puncture state to the indwelling state by withdrawing the needle hub.

The needle seat is provided with a first through hole communicating with the inner channel of the puncture needle.

A second through hole is also provided on the needle base, and the second through hole is used to directly introduce liquid into the catheter base without passing through the puncture needle.

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

In another preferred example, the trocars include intravenous infusion needles, arterial puncture needles and nerve block needles.

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

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

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

In another preferred example, the opening of the second through hole in the catheter adapter faces towards the indwelling catheter.

In another preferred example, the trocar further includes an extension tube;

Moreover, one end of the extension tube communicates with the needle hub, and the other end is used for infusion to the needle hub.

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

In another preferred example, the opening of the second through hole in the catheter adapter is a side opening (that is, it forms a certain angle (such as 60°-120°) with the central axis of the catheter adapter).

In another preferred example, the trocar further includes a withdrawing part, the withdrawing part is used to drive the needle seat to be pulled, so that the trocar changes from the piercing state to the The above retention status.

In another preferred example, the retracting component is a needle wing.

In another preferred example, the withdrawing part includes a needle handle handle, a detachment part, and an optional needle handle connection part between the needle handle handle and the detachment part, wherein the The front end of the disengagement part is connected with the needle holder, and can drive the needle holder for pulling.

In another preferred example, the handle portion of the needle handle is a flat structure.

In another preferred example, convex points are provided on the outer surface of the handle portion of the needle handle to facilitate the pinching operation.

In another preferred example, the handle portion of the needle handle is also convenient for puncturing.

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

In another preferred example, the observation window structure is an elongated see-through hole provided on the detachment part.

In another preferred example, the detachment part is an arc-shaped structure (such as a 60-240° arc structure), and its inner surface is a concave arc that matches the shape of the outer surface of the needle hub and/or extension tube surface.

In another preferred example, when the trocar changes from the puncturing state to the indwelling state, the detachment part is separated from the needle hub, so that the retracting part and the The rest of the trocar is separated.

In another preferred example, the front end of the detachment part engages with the tail end of the needle holder, so that the withdrawing part drives the needle holder back through the detachment part and enables the retraction The pumping part falls off from the needle hub.

In another preferred example, the needle base includes a head end part, a middle part and a tail end part connected in sequence;

Moreover, the outer surface of the tail end part is provided with a first part and a second part, and the tail end part is closely attached to the detachment part, and the front end of the detachment part is provided with a third part; The third part is matched with the first part, and the third part is matched with the first part so that the third part and the tail end part are tightly clamped and fitted; the third part The first edge and the second edge of the second portion are in close contact with each other, so that the needle hub can be retracted by the retracting component.

In another preferred example, the first position is a first depression, the second position is a first protrusion, and the third position is a second protrusion.

In another preferred example, an annular groove is provided on a circle of the outer surface of the head end portion, and an elastic ring is provided in the annular groove for realizing the contact between the needle hub and the catheter hub. tightness.

In another preferred example, the head end part is provided with a sealing rubber plug to ensure the sealing between the needle hub and the catheter hub in an indwelling state.

In another preferred example, the inner surface and/or the outer surface of the catheter adapter is provided with a retraction guide structure for guiding the retraction component and/or the needle adapter to guide retraction.

In another preferred example, said retraction is non-rotational retraction, rotary retraction, or a combination thereof.

In another preferred example, the withdrawing part includes a needle handle handle, a detachment part, and a needle handle connection part between the needle handle handle and the detachment part.

In another preferred example, the handle portion of the needle handle of the withdrawal component is further provided with a protrusion for guiding withdrawal, and the outer surface of the catheter base is provided with a groove matching the protrusion. The retracting component is retracted through the mutual cooperation of the protrusion and the groove.

In another preferred example, the handle portion of the needle handle of the withdrawal component is further provided with a concave structure for guiding withdrawal, and the outer surface of the catheter adapter is provided with a convex line matching the concave structure. The retracting part is retracted through the mutual cooperation of the concave structure and the convex strip.

In another preferred example, the detachment part of the withdrawal part is also provided with a protrusion for guiding the withdrawal, and the inner surface of the catheter base is provided with a groove matching the protrusion, and the withdrawal The part is withdrawn by the cooperation of said protrusions and grooves.

In another preferred example, the detachment part of the withdrawal part is provided with a concave structure for guiding the withdrawal, and the inner surface of the catheter adapter is provided with a convex line matching the concave structure, and the withdrawal part The retraction is carried out through the mutual cooperation of the concave structure and the convex strip.

In another preferred example, the needle base is further provided with a protrusion for guiding withdrawal, the inner surface of the catheter base is provided with a groove matching the protrusion, and the withdrawal part passes through the The mutual cooperation of the protrusion and the groove carries out retraction.

In another preferred example, the needle base is provided with a concave structure for guiding withdrawal, and the inner surface of the catheter base is provided with a convex line matching the concave structure, and the withdrawal component passes through the depression The mutual cooperation of the structure and the convex strip is used for retraction.

In another preferred example, a first limiting structure is provided on the outer surface of the needle seat; and

The tail of the catheter hub is provided with a second limiting structure matching the first limiting structure, so that the needle hub is blocked when the needle hub is withdrawn to a predetermined position.

In another preferred example, the predetermined position includes withdrawing the needle hub to the rear of the catheter hub so that the puncture needle is completely retracted to the position inside the catheter hub.

In another preferred example, the first limiting structure is a protrusion, and the second limiting structure is a depression.

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

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

In another preferred example, the first limiting structure is a depression, and the second limiting structure is a protrusion.

In another preferred example, the first limiting structure and/or the second limiting structure is an elastic structural member.

In another preferred example, the first limiting structure includes a spring, and a spring hole provided on the needle seat for accommodating the spring;

Moreover, when the needle seat moves to a predetermined position, the spring is stretched and enters the second limiting structure, thereby realizing limiting.

In another preferred example, the trocar is further provided with a fin, the fin is arranged near the head end of the catheter adapter and the fin tightly clamps the catheter adapter; and/or

The trocar is also provided with a protective cap that fits over the outside of the indwelling catheter.

In another preferred example, the fins and the catheter adapter are integrally constructed.

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

In another preferred example, the length of the indwelling catheter is 1.0-15.0 cm, preferably 1.5-5.0 cm, more preferably 1.5 cm-3 cm.

In another preferred example, the catheter adapter is transparent or opaque or partially transparent.

The second aspect of the utility model provides a safe intravenous infusion needle, which includes an indwelling catheter, a catheter seat, a puncture needle and a needle seat;

Wherein, one end of the indwelling catheter is connected to the catheter base, one end of the puncture needle is connected to the needle base, and the puncture needle and the needle base are hollow structures communicating with each other, the indwelling catheter includes a puncture state and There are two indwelling states, and the indwelling state is obtained through the transition of the puncture state;

In the puncture state, the aforementioned puncture needle is placed in the indwelling catheter to play a supporting role, and the tip of the puncture needle guides the outer indwelling catheter to cooperate with each other and invade into the punctured physiological tissue;

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

And the indwelling state is formed by withdrawing the needle holder after experiencing the puncture state;

The needle base is provided with a first through hole communicating with the inner channel of the puncture needle;

A second through hole is also provided on the needle base, and the second through hole is used to directly introduce liquid into the catheter base without passing through the puncture needle;

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

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

(a) providing the trocar according to the first aspect, the trocar being in a piercing state;

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

(d) After the successful puncture is confirmed, the needle seat of the trocar is withdrawn, thereby changing the trocar from the puncture state to the indwelling state;

And the method further includes step (b): connecting the trocar with medical equipment;

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

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

In another preferred example, the puncture site includes tissue or blood vessel.

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

The fourth aspect of the utility model provides a trocar infusion method, comprising steps:

(a1) providing the trocar described in the first aspect of the utility model, the trocar is in a puncture state;

(b1) optionally connecting the trocar with a medical liquid through an extension tube, thereby forming an infusion set;

(c1) Utilize the cannula in the puncture kit of the previous step to puncture the puncture site of the infusion object;

(d1) After the successful puncture is confirmed, perform a withdrawal operation on the needle seat of the trocar, thereby changing the trocar from the puncture state to the indwelling state;

(b2) optionally connecting the trocar with a medical fluid through an extension tube, thereby forming an infusion set;

(e1) administering an infusion;

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

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

In another preferred example, the puncture site includes tissue or blood vessel.

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

In another preferred example, the medical liquid includes any medical and/or medicinal liquid.

It should be understood that within the scope of the present utility model, the above-mentioned technical features of the present utility model and the technical features specifically described in the following (such as embodiments) can be combined with each other to form new or preferred technical solutions . Due to the limited space, I won't go into details here.

Description of drawings

FIG. 1 is a schematic structural view of a needle holder in an embodiment of the present invention.

Fig. 2 shows the medical trocar in one embodiment of the present invention, wherein Fig. 2 (a) is the puncture state, Fig. 2 (b) is after the needle holder is withdrawn, changes from the puncture state to the indwelling state, Fig. 2 (c) It is the indwelling state (or the state during infusion), at which time the withdrawing part has been detached.

Fig. 3 is a schematic structural diagram of a medical trocar in an embodiment of the present invention.

Fig. 4 is a schematic structural view of the needle holder in an embodiment of the present invention.

Fig. 5 (a) and Fig. 5 (b) are respectively the structural representations of the front and back sides of the retractable part in one embodiment of the utility model, wherein Fig. 5 (a) is the front of the retractable part, and Fig. 5 (b) is Pull back the reverse side of the part.

Fig. 6 is a schematic structural diagram of a medical trocar in an embodiment of the present invention.

Fig. 7 is a schematic structural view of a trocar for traditional Chinese medicine according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a safety intravenous infusion needle in an embodiment of the present invention.

Fig. 9 is a schematic diagram of the use of the safety intravenous infusion needle in one embodiment of the present invention.

Fig. 10 is a schematic structural view of a safety intravenous infusion needle in an embodiment of the present invention.

Detailed ways

After extensive and in-depth research, the inventor first developed a medical trocar with multiple infusion channels, non-detachable puncture needle and self-cleaning function. The medical trocar is provided with a puncture state In the puncture state, the puncture needle is placed in the indwelling catheter for easy puncture; while in the indwelling state, the needle tip of the puncture needle is completely retracted into the catheter adapter. In this way, during the infusion, the puncture needle remains completely in the catheter seat, eliminating the risk of the patient being punctured by the steel needle; after the infusion is over, the risk of accidental injury and infection of the medical staff is also eliminated. At the same time, since the medical trocar of the present invention has a self-cleaning function, the risk of subsequent recovery and treatment of the medical trocar is also significantly reduced. Completed the utility model on this basis.

the term

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

trocar

The utility model 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 seat. In addition, the medical trocar of the utility model also has multiple infusion channels, and has the self-cleaning function of the puncture needle.

Typically, the trocar of the present invention includes:

a catheter socket;

an indwelling catheter, the indwelling catheter is arranged at the front end of the catheter adapter;

a needle hub 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 connected to each other;

Wherein, the trocar includes 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 within the catheter adapter, wherein the needle tip of the introducer needle is fully retracted into the catheter adapter and out of contact with the indwelling catheter;

And, the trocar is changed from the puncture state to the indwelling state by withdrawing the needle hub;

The needle base is provided with a first through hole communicating with the inner channel of the puncture needle;

A second through hole is also provided on the needle base, and the second through hole is used to directly introduce liquid into the catheter base without passing through the puncture needle;

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

It should be understood that, unlike the prior art, in the present invention, in the indwelling state, the interior of the catheter adapter is isolated from the outside world except for the liquid inlet and the liquid outlet. In the indwelling state, part of the liquid flows into the catheter adapter through the second channel, and part of the liquid flows into the catheter adapter through the first channel (such as near the confluence area), and forms a confluence at the confluence area, and then flows into the tissue (such as a human vein) through the indwelling catheter ).

In the present invention, the trocars may include various types of medical trocars, especially medical trocars used in situations where liquid (such as medicine) needs to be infused or liquid samples (such as blood samples) need to be collected. Representative examples include (but are not limited to): IV needles, arterial needles, and nerve block needles.

In the present invention, one of the main functions of the needle holder is to fix the puncture needle, so that when the needle holder is withdrawn, the puncture needle is driven to retract completely into the catheter holder. Another main function of the needle base is to provide two or more passages for liquid communication, including at least the first passage (formed by the first through hole on the needle base and the inner passage of the puncture needle) and the second passage (formed by the inner passage of the puncture needle). The second through hole is formed). Another primary function of the needle hub is to seal the infusion fluid within the catheter hub.

Because the trocar (comprising the infusion needle) of the present utility model is provided with two or more channels, therefore, the infusion speed of the present utility model is greater than the speed when infusion is only performed through the inner channel of the puncture needle in the conventional infusion.

In order to facilitate the retraction of the needle holder, a retraction part is preferably provided, and the retraction part is used to drive the needle holder to be pulled, so that the trocar changes from the puncture state to the lien status.

Generally, the withdrawal part includes a needle handle handle, a detachment part, and optionally a needle handle connection part between the needle handle handle and the detachment part, wherein the front end of the detachment part is connected to the The needle holders are connected and can drive the needle holders to be drawn.

In another preferred example, when the trocar changes from the puncturing state to the indwelling state, the detachment part is separated from the needle hub, so that the retracting part and the The rest of the trocar is separated.

It should be understood that the structure and shape of the retracting part and its constituent parts (needle handle handle, detachment part, connecting part) are not particularly limited, mainly it can realize the retraction of the needle hub, so that the trocar can be removed from the punctured state. Just change to the indwelling state described above.

In the present invention, the shape of the handle portion of the needle handle is not particularly limited, and various conventional shapes, such as flat, can be adopted. The handle part can also be a raised part perpendicular to the catheter base, so as to be suitable for different clinical manipulations. A preferred handle of the needle handle is a flat structure. In addition, convex points can be provided on the outer surface of the handle portion of the needle handle to facilitate the pinching operation.

In another preferred example, the front end of the detachment part engages with the tail end of the needle holder, so that the withdrawing part drives the needle holder back through the detachment part and enables the retraction The pumping part falls off from the needle hub.

In the present invention, the inner surface and/or outer surface of the catheter adapter is provided with a retraction guide structure, which can guide the retraction component and/or the needle holder to perform retraction, preferably the retraction is non-rotational Withdraw. The withdrawal guiding structure may be arranged inside the catheter hub, the handle part of the needle handle, the detachment part, and/or on the needle hub.

Preferably, the handle portion of the needle handle of the withdrawal component is also provided with a protrusion for guiding withdrawal, and the outer surface of the catheter adapter is provided with a groove matching the protrusion, and the withdrawal component passes through The mutual cooperation of the protrusion and the groove performs retraction.

In another preferred example, the detachment part of the withdrawal part is also provided with a protrusion for guiding the withdrawal, and the inner surface of the catheter base is provided with a groove matching the protrusion, and the withdrawal The part is withdrawn by the cooperation of said protrusions and grooves.

In another preferred example, the needle base is further provided with a protrusion for guiding withdrawal, the inner surface of the catheter base is provided with a groove matching the protrusion, and the withdrawal part passes through the The mutual cooperation of the protrusion and the groove carries out retraction.

In the present utility model, a preferred needle base includes a head end part, a middle part and a tail end part connected in sequence; wherein, the outer surface of the tail end part is provided with a first part and a second part, and the The tail end part is tightly fitted with the release part, and the front end of the release part is provided with a third part; the third part is matched with the first part, and the third part is matched with the first part. The parts are matched so that the third part and the tail end part are tightly clamped and fitted; the first edge of the third part and the second edge of the second part are closely fitted to each other, so that the needle hub Capable of being retracted by the retraction means.

Preferably, an annular groove is provided on a circle of the outer surface of the head end portion, and an elastic ring is provided in the annular groove to realize the sealing between the needle hub and the catheter hub. Alternatively, the head end part is provided with a sealing rubber plug to ensure the sealing between the needle hub and the catheter hub in an indwelling state.

In addition, in order to prevent the needle hub from being pulled away from the catheter hub during withdrawal, a corresponding limiting structure may preferably be provided. In another preferred example, the outer surface of the needle hub is provided with a first limiting structure; the tail of the catheter hub is provided with a second limiting structure matching the first limiting structure, so that the The needle seat is blocked when the needle seat is withdrawn to a predetermined position. In this way, when the withdrawing part pulls back the puncture needle, the first limiting structure is combined with the second limiting structure, and the first limiting structure can be snapped into the second limiting structure The needle hub is thereby secured so that the needle hub cannot be pulled out of the catheter hub.

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

In addition, the first limiting structure and/or the second limiting structure may also be an elastic structural member. For example, the first limiting structure includes a spring, and a spring hole arranged on the needle seat for accommodating the spring; when the needle seat moves to a predetermined position, the spring stretches and enters the first position. Two limit structures, so as to realize the limit.

In another preferred example, the trocar is further provided with a fin, the fin is arranged near the head end of the catheter adapter and the fin tightly clamps the catheter adapter; and/or

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

In another preferred example, the length of the indwelling catheter is not particularly limited, and usually depends on the application of the trocar. Typically, the length of the indwelling catheter is 1.0-15.0 cm, preferably 1.5-5.0 cm, more preferably 1.5 cm-3 cm.

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

In the present invention, the material of the catheter base is not particularly limited, and it is usually plastic, especially hard plastic material. In addition, the catheter adapter is preferably transparent or non-transparent or partially transparent, so as to observe blood return and transfusion.

In addition, in order to facilitate the observation of blood return, an observation window structure for observing blood return can also be provided on the detachment part.

It should be understood that with the trocar of the present invention, one or more infusion containers can be connected at the rear end. For example, a plurality of infusion containers can be connected with the trocar of the present invention through a "Y" joint and an extension tube, so as to perform infusion simultaneously or successively.

In the utility model, in the indwelling state, the needle point of the puncture needle located in the catheter base is facing the liquid inlet of the indwelling catheter, and an infusion confluence area is formed between the needle point of the puncture needle and the liquid inlet of the indwelling catheter. In the confluence area, the liquid flowing out from the puncture needle (that is, from the first channel) and the liquid that flows out from the second through hole (that is, from the second channel) form a confluence, and enter the indwelling catheter. Due to the increased liquid flow rate in the confluence area, the cleaning (self-cleaning) effect on the needle tip of the puncture needle is better, thereby greatly reducing the risk of subsequent recycling of the medical trocar.

IV needle

The utility model also provides a safe intravenous infusion needle, which includes an indwelling catheter, a catheter seat, a puncture needle and a needle seat;

Wherein, one end of the indwelling catheter is connected to the catheter base, one end of the puncture needle is connected to the needle base, and the puncture needle and the needle base are hollow structures communicating with each other, the indwelling catheter includes a puncture state and There are two indwelling states, and the indwelling state is obtained through the transition of the puncture state;

In the puncture state, the aforementioned puncture needle is placed in the indwelling catheter to play a supporting role, and the tip of the puncture needle guides the outer indwelling catheter to cooperate with each other and invade into the punctured physiological tissue;

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

And the indwelling state is formed by withdrawing the needle holder after experiencing the puncture state;

The needle base is provided with a first through hole communicating with the inner channel of the puncture needle;

A second through hole is also provided on the needle base, and the second through hole is used to directly introduce liquid into the catheter base without passing through the puncture needle;

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

Puncture method

The utility model also provides a trocar puncture method, comprising steps:

(a) providing the trocar of the present utility model, the trocar is in a puncture state;

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

(d) After the successful puncture is confirmed, the needle seat of the trocar is withdrawn, thereby changing the trocar from the puncture state to the indwelling state;

And the method further includes step (b): connecting the trocar with medical equipment;

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

In the present invention, the medical equipment that can be connected with the trocar of the present invention is not limited, and representative medical equipment is selected from the following group: infusion container, pressure sensor, or a combination thereof.

Infusion method

The utility model also provides a trocar infusion method, comprising steps:

(a1) providing the trocar of the present utility model, the trocar is in a puncture state;

(b1) optionally connecting the trocar with a medical liquid through an extension tube, thereby forming an infusion set;

(c1) Utilize the cannula in the puncture kit of the previous step to puncture the puncture site of the infusion object;

(d1) After the successful puncture is confirmed, perform a withdrawal operation on the needle seat of the trocar, thereby changing the trocar from the puncture state to the indwelling state;

(b2) optionally connecting the trocar with a medical fluid through an extension tube, thereby forming an infusion set;

(e1) administering an infusion;

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

In the utility model, when infusion, the puncture needle, the indwelling catheter, the needle seat and the catheter seat are integrated.

Preferably, said step (d1) includes sub-steps:

(d11) After the successful puncture is confirmed, the hand-held withdrawal part drives the needle seat to slide backward until the needle seat is stuck at the tail of the catheter seat;

(d12) Detach the withdrawing part from the needle seat.

In the present utility model, typical puncture sites include (but not limited to): tissues or blood vessels.

It should be understood that the medical liquid that can be infused with the method of the present invention is not particularly limited, including any medical and/or medicinal liquid, such as physiological saline, glucose solution, etc. with or without adding drugs.

The main advantages of the utility model include:

(a) The needle holder is provided with a first through hole communicating with the inner channel of the puncture needle, and a second through hole is also provided on the needle holder. In the indwelling state, the first through hole and the second through hole The two through holes form a conduction structure with different infusion directions, which can avoid delivering all the liquid to the indwelling catheter through a single direction, and increase the flow rate of the liquid at the same time;

(b) The trocar is provided with a withdrawing part, which can be pulled back after the puncture is successful so that the puncture needle can be completely retracted into the catheter adapter, so as to ensure that the needle will not puncture the blood vessel during infusion, which reduces the pain of the patient. Fear, during the infusion process, you can properly stretch your limbs, get rid of the original stiff posture during infusion, and improve the safety during infusion;

(c) The inner surface and the outer surface of the catheter adapter are provided with a retraction guide structure, which can guide the retraction part and the needle holder to perform retraction and prevent rotational displacement;

(d) The needle seat of the trocar is provided with a first limit structure, and the tail of the catheter base is provided with a second limit structure matching the first limit structure, when the retracting part is retracted When pulling 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 to fix the needle hub, The needle seat will not be pulled out from the catheter seat so that the puncture needle is still in the catheter seat, avoiding the exposure of the puncture needle stained with the patient's blood, thereby causing accidental injury and infection of medical staff and patients, and providing medical workers Provide a good and safe working environment;

(e) The head end of the needle hub is provided with a sealing rubber plug, which can ensure the sealing between the needle hub and the catheter hub in the indwelling state;

(f) When the trocar is in the indwelling state, the puncture needle is placed in the catheter adapter, and the puncture needle (including the inner cavity and the outer surface) is cleaned synchronously when infusing the catheter adapter. In this way, after the infusion is completed, the puncture needle and the catheter base are very clean, thereby greatly reducing the risk of subsequent recycling of the medical trocar;

(g) The detachment part is also provided with an observation window structure, which is convenient for observing the return of blood.

Below in conjunction with specific embodiment, further set forth the utility model. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. For the experimental methods without specific conditions indicated in the following examples, the conventional conditions or the conditions suggested by the manufacturer are usually followed. Percentages and parts are by weight unless otherwise indicated.

It should be noted that in the claims and description of this patent, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or Any such actual relationship or order between such entities or operations is implied. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Example 1

Needle hub and medical trocar

This embodiment describes a preferred needle hub and a medical trocar using the needle hub.

This embodiment adopts the medical trocar with the needle seat shown in Figure 1, including:

a catheter socket;

an indwelling catheter, the indwelling catheter is arranged at the front end of the catheter adapter;

a needle hub 3, said needle hub 3 being located inside said catheter hub; and

A puncture needle, one end of the puncture needle is fixed to the needle base 3, and the puncture needle and the needle base 3 are hollow structures communicating with each other.

Wherein, the trocar includes a puncture state and an indwelling state; in the puncture state, the puncture needle is placed in the indwelling catheter; Pumping, from the puncture state to the indwelling state. In the indwelling state, the puncture needle is placed in the catheter adapter, wherein the needle tip of the puncture needle is completely retracted into the catheter adapter, and does not contact the indwelling catheter.

As shown in FIG. 1 , the needle hub 3 is provided with a first through hole 21 communicating with the inner channel of the puncture needle. The inner passage of the puncture needle and the first through hole 21 form a first passage for liquid to flow.

A second through hole 22 is also provided on the needle base 3, and the second through hole 22 is used to directly introduce liquid into the catheter base without passing through the puncture needle.

Moreover, in the indwelling state, the first through hole 21 and the second through hole 22 form a conduction structure for liquid to flow.

In this embodiment, the number of the second through hole 22 is 1 (or 2 or 3 or more). In addition, although the structures of the second through holes 22 are the same, the structures of the second through holes 22 may also be different.

The opening of the second through hole 22 in the catheter adapter is facing the indwelling catheter.

Example 2

medical trocar

As shown in Figures 2-3, the safety medical trocar with multiple infusion channels in this embodiment includes:

a catheter adapter 1;

An indwelling catheter 2, the indwelling catheter 2 is arranged at the front end of the catheter adapter 1;

a needle hub 3, said needle hub 3 is located inside said catheter hub 1; and

A puncture needle 4, one end of the puncture needle 4 is fixed to the needle base 3, and the puncture needle 4 and the needle base 3 are hollow structures communicating with each other.

Wherein, the trocar includes a puncture state and an indwelling state; in the puncture state, the puncture needle 4 is placed in the indwelling catheter 2 (as shown in Figure 2(a)); the The trocar changes from the puncture state to the indwelling state by withdrawing the needle hub 3 . In the indwelling state, the puncture needle 4 is placed in the catheter adapter 1, wherein the needle tip of the puncture needle 4 is completely retracted into the catheter adapter 1, and is not separated from the indwelling catheter 2. contact (as shown in Figure 2(b)).

The needle base 3 is provided with a first through hole communicating with the inner channel of the puncture needle 4 .

A second through hole is also provided on the needle base 3 , and the second through hole is used to directly introduce liquid into the catheter base 1 without passing through the puncture needle 4 .

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

In this embodiment, the trocar further includes a retracting part 5, and the withdrawing part 5 is used to drive the needle holder 3 to be pulled, so that the trocar changes from the punctured state to said retention status.

The withdrawal part 5 includes a needle handle handle 6, a detachment part 7 and a needle handle connection part 8 between the needle handle handle 6 and the detachment part 7, wherein the front end of the detachment part 7 It is connected with the needle holder 3 and can drive the needle holder 3 to be drawn.

The front end of the detachment part 7 and the tail end of the needle holder 3 are engaged with each other, so that the withdrawal part 5 drives the needle holder 3 to withdraw through the detachment part 7 and can make the withdrawal part 5 5 falls off from the needle seat 3 (as shown in Fig. 2(c)).

When performing infusion, as shown in Figure 3, the trocar also includes an extension tube 16, and one end of the extension tube 16 communicates with the needle hub 3, and the other end is used for infusion to the needle hub 3 , the extension tube 16 is externally connected with a "Y" type connector 17 for infusion.

In this embodiment, the trocar is further provided with a fin 9 , the fin 9 is arranged close to the head end of the catheter adapter 1 and the fin 9 tightly clamps the catheter adapter 1 .

Example 3

medical trocar

This embodiment provides a safe medical trocar with multiple infusion channels. The trocar in this embodiment is improved on the basis of the trocar in Embodiment 2. The main improvements are as follows:

As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5(a) and Fig. 5(b), in this embodiment, the needle holder 3 includes a head end part 10, a middle part 11 and a tail end part connected in sequence 12;

Moreover, a first part 13 and a second part 24 are provided on the outer surface of the tail end part 12, and the detachment part 7 is closely attached to the tail part 12, and the front end of the detachment part 7 is provided with There is a third part 25; the third part 25 is matched with the first part 13, and the third part 25 is matched with the first part 13 so that the third part 25 is compatible with the tail part 12 tightly clamping fit; the first edge 26 of the third part 25 and the second edge 27 of the second part 24 are in close contact with each other, so that the needle hub 3 can be retracted by the retracting part For example, in this embodiment, the first part 13 is a first concave part, the second part 24 is a first raised part, and the third part 25 is a second raised part;

The head end part 10 is provided with a sealing rubber plug 20 to ensure the sealing between the needle hub 3 and the catheter hub 1 in the indwelling state;

The outer surface of the handle portion 6 of the needle handle is provided with convex points, which is convenient for pinching operation;

The detachment part 7 is also provided with an observation window structure 23 for observing blood return, and the observation window structure 23 is an elongated see-through hole provided on the detachment part 7 .

Example 4

medical trocar

As shown in Figure 6, this embodiment provides a safe medical trocar with multiple infusion channels, the trocar includes:

a catheter adapter 1;

An indwelling catheter 2, the indwelling catheter 2 is arranged at the front end of the catheter adapter 1;

a needle hub 3, said needle hub 3 is located inside said catheter hub 1; and

A puncture needle 4, one end of the puncture needle 4 is fixed to the needle base 3, and the puncture needle 4 and the needle base 3 are hollow structures communicating with each other.

The trocar includes a puncture state and an indwelling state; in the puncture state, the puncture needle 4 is placed in the indwelling catheter 2; the trocar is withdrawn through the needle hub 3 , from the puncturing state to the indwelling state. In the indwelling state, the puncture needle 4 is placed in the catheter adapter 1, wherein the needle tip of the puncture needle 4 is completely retracted into the catheter adapter 1, and is not separated from the indwelling catheter 2. touch.

The needle base 3 is provided with a first through hole communicating with the inner channel of the puncture needle 4 .

A second through hole is also provided on the needle base 3 , and the second through hole is used to directly introduce liquid into the catheter base 1 without passing through the puncture needle 4 .

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

In this embodiment, the trocar further includes a retracting part 5, and the withdrawing part 5 is used to drive the needle holder 3 to be pulled, so that the trocar changes from the punctured state for the said retention status.

The withdrawal part 5 includes a needle handle handle 6, a detachment part 7, and a needle handle connection part 8 between the needle handle handle 6 and the detachment part 7, wherein the front end of the detachment part 7 It is connected with the needle holder 3 and can drive the needle holder 3 to be drawn.

In this embodiment, the inner surface and the outer surface of the catheter hub 1 are provided with a retraction guide structure for guiding the retraction component 5 and the needle hub 3 to retract, and the retraction is a non-rotational retraction .

The needle handle handle 6 of the retraction part 5 is also provided with a projection 18 for guiding retraction, and the outer surface of the catheter adapter 1 is provided with a groove 19 matching the projection 18, and the retraction The drawing part 5 is drawn back through the mutual cooperation of the protrusion 18 and the groove 19 .

The detachment part 7 of the withdrawal part 5 is provided with a concave structure for guiding the withdrawal, and the inner surface of the catheter adapter 1 is provided with a convex line matching the concave structure, and the withdrawal part 5 passes through the The mutual cooperation of the concave structure and the convex strip is used for retraction.

Example 5

medical trocar

As shown in Figure 7, this embodiment provides a safety medical trocar with multiple infusion channels, the trocar includes:

a catheter adapter 1;

An indwelling catheter 2, the indwelling catheter 2 is arranged at the front end of the catheter adapter 1;

a needle hub 3, said needle hub 3 is located inside said catheter hub 1; and

A puncture needle 4, one end of the puncture needle 4 is fixed to the needle base 3, and the puncture needle 4 and the needle base 3 are hollow structures communicating with each other.

Wherein, the trocar includes a puncture state and an indwelling state; in the puncture state, the puncture needle 4 is placed in the indwelling catheter 2; and in the indwelling state, the puncture needle 4 4 placed in the catheter adapter 1.

In addition, the trocar changes from the puncture state to the indwelling state by withdrawing the needle hub 3 .

The needle base 3 is provided with a first through hole communicating with the inner channel of the puncture needle 4 .

A second through hole is also provided on the needle base 3 , and the second through hole is used to directly introduce liquid into the catheter base 1 without passing through the puncture needle 4 .

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

In this embodiment, the outer surface of the needle hub 3 is provided with a first limiting structure 14, and the tail of the catheter hub 1 is provided with a second limiting structure 15 matching the first limiting structure 14 , so that the needle holder 3 is blocked when the needle holder 3 is drawn back to a predetermined position.

The predetermined position is a position where the needle hub 3 is drawn back to the rear of the catheter hub 1 so that the puncture needle 4 is fully retracted to the inside of the catheter hub 1 .

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

In this embodiment, the outer diameter of the puncture needle 4 is 24G, the length of the indwelling catheter 2 is 2 cm, and the catheter adapter 1 is partially transparent.

Example 6

IV needle

This embodiment provides a safe intravenous infusion needle, which includes an indwelling catheter, a catheter seat, a puncture needle and a needle seat.

Wherein, one end of the indwelling catheter is connected to the catheter base, one end of the puncture needle is connected to the needle base, and the puncture needle and the needle base are hollow structures communicating with each other, the indwelling catheter includes a puncture state and There are two indwelling states, and the indwelling state is obtained through the transition of the puncture state.

In the puncture state, the aforementioned puncture needle is placed in the indwelling catheter to play a supporting role, and the tip of the puncture needle guides the outer indwelling catheter to cooperate with each other and invade into the punctured physiological tissue.

In the indwelling state, the puncture needle is placed in the catheter base.

Moreover, the indwelling state is formed by withdrawing the needle hub after experiencing the puncture state.

The needle base is provided with a first through hole communicating with the inner channel of the puncture needle;

A second through hole is also provided on the needle base, and the second through hole is used to directly introduce liquid into the catheter base without passing through the puncture needle.

Moreover, in the indwelling state, the first through hole and the second through hole form a conduction structure for liquid to flow.

Example 7

Intravenous Infusion Method

The present embodiment provides a kind of trocar infusion method, comprises steps:

(a1) provide the trocar described in embodiment 1, described trocar is in puncture state;

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

(c1) Use the cannula in (b1) puncture kit to puncture the puncture site of the puncture and infusion object;

(d1) After the successful puncture is confirmed, the trocar is adjusted to an indwelling state;

(e1) Perform infusion.

During infusion, the puncture needle, indwelling catheter, needle seat and catheter seat are integrated.

In this embodiment, the step (d1) includes sub-steps:

(d11) After the successful puncture is confirmed, the hand-held withdrawal part drives the needle seat to slide backward until the needle seat is stuck at the tail of the catheter seat;

(d12) Detach the withdrawing part from the needle seat.

In this embodiment, the blood return at the puncture site confirms that the puncture is successful.

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

Example 8

Intravenous Infusion Method

The present embodiment provides a kind of trocar infusion method, comprises steps:

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

(c1) using the cannula in (a1) to puncture at the puncture site of the puncture and infusion object;

(d1) After the successful puncture is confirmed, the trocar is adjusted to an indwelling state;

(b2) Connect the trocar in the indwelling state in (d1) to the medical liquid through the extension tube;

(e1) Perform infusion.

During infusion, the puncture needle, indwelling catheter, needle seat and catheter seat are integrated.

In this embodiment, the step (d1) includes sub-steps:

(d11) After the successful puncture is confirmed, the hand-held withdrawal part drives the needle seat to slide backward until the needle seat is stuck at the tail of the catheter seat;

(d12) Detach the withdrawing part from the needle seat.

Example 9

Safety IV Needle

As shown in FIG. 8 , this embodiment provides a safety intravenous infusion needle, which includes an indwelling catheter 1c, a catheter hub 2c, a puncture needle 3c and a needle hub 4c.

Wherein, one end of the indwelling catheter 1c is connected to the catheter base 2c, one end of the puncture needle 3c is connected to the needle base 4c, and the puncture needle 3c and the needle base 4c are hollow structures communicating with each other. The indwelling catheter 1c includes a punctured state and an indwelling state, and the indwelling state is obtained through the transition of the punctured state.

In the puncture state, the aforementioned puncture needle 3c is placed in the indwelling catheter 1c to play a supporting role, and the tip of the puncture needle 3c guides the outer indwelling catheter 1c, and cooperates with each other to invade into the punctured physiological tissue .

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

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

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

The catheter base 2c is provided with a limiting structure 9c.

The outer surface of the needle holder 4c is provided with a second locking groove 10c on a circle, the second locking groove 10c matches the end of the limiting structure 9c, and the second locking groove 10c matches the limiting structure 9c. The ends of the position-limiting structure 9c are used to buckle the end of the position-limiting structure 9c in the second locking groove 10c so as to fix the needle hub 4c.

The infusion needle is also provided with a needle wing 6c, the rear end of the needle wing 6c is provided with a buckle, and the outer surface of the needle holder 4c is also provided with a first locking groove 8c, and the first locking groove 8c and The tail of the needle wing 6c is buckled to match, and the first locking slot 8c is used to buckle the tail of the needle wing 6c in the first locking slot 8c.

The needle wing 6c is provided with a first groove 7c, the first groove 7c is matched with the side end of the catheter adapter 2c, and the first groove 7c is used to clamp the needle wing 6c on the on the side end of the catheter adapter 2c.

In use, as shown in FIG. 9 , when the needle wings 6c are pulled back, the puncture needle 3c retreats to the inside of the catheter adapter 2c.

In this embodiment, when in use, pinch the needle wing 6c for venipuncture. After blood returns and the puncture is successful, the needle wing 6c is pulled back and the indwelling catheter 1c is pushed forward at the same time, and the puncture needle 3c is retracted to the inside of the catheter adapter 2c. The position structure 9c will be stuck on the second slot 10c on the needle base 4c to realize the function of fixing the needle base 4c. At the same time, the needle wing 6c will be naturally detached from the first slot 8c, and then the liquid in the infusion tube 5c will pass through the needle. The transfusion conduction structure formed by the seat 4c and the puncture needle 3c performs transfusion to the indwelling catheter 1c.

In this embodiment, the outer surface of the needle holder 4c is provided with a second locking groove 10c matching the end of the stop structure 9c, which can ensure that when the needle holder 4c is rotated for a circle, the stop The end of the structure 9c can be snapped into any second locking groove 10c on the outer surface of the needle holder 4c, so as to ensure that the needle holder 4c will not be pulled out.

Example 10

Safety IV Needle

As shown in Figure 10, the safe intravenous infusion needle of this embodiment is basically the same as that of Embodiment 9, the difference lies in the following improvements:

(a) There is also a second groove (not shown in the figure) on the outer surface of the needle holder 4c, and an elastic ring 11c is arranged in the second groove to ensure that the needle holder 4c Tightness with the catheter adapter 2c.

(b) The infusion needle is also provided with a protective cap (not shown in the figure), and the protective cap is arranged on the nozzle of the indwelling catheter 1c.

(c) One end connected between the needle base 4c and the puncture needle 3c is the puncture needle connection end, and a through hole (not shown in the figure) is arranged on the connection end of the puncture needle 3c, and the through hole is in the indwelling state. And the puncture needle 3c constitutes a conduction structure with different infusion directions, and the infusion to the indwelling catheter 1c can avoid sending all the liquid to the indwelling catheter 1c through a single direction, increasing the liquid flow rate.

(d) The structure of the first locking groove 8c includes at least one beveled edge, which is used for quickly falling off the needle wing 6c.

In this embodiment, when in use, first take off the protective cap (not shown in the figure), and puncture the puncture needle 3c into the blood vessel. After the puncture is successful, pinch the needle wing 6c and pull it back. The limiting structure 9c on the seat 2c will be stuck in the second slot 10c on the needle base 4c, and the needle wing 6c will also be disengaged from the first slot 8c. At this time, the puncture needle 3c will return to the inside of the catheter base 2c, It can ensure that the puncture needle will not puncture the blood vessel during the infusion. After the infusion, the venous infusion needle is pulled out. At this time, the puncture needle 3c is still in the catheter base 2c, and then the through hole (not shown in the figure) and the puncture needle 3c Constructing a conduction structure with different infusion directions for infusion operation to the indwelling catheter 1c can avoid sending all liquid to the indwelling catheter 1c through a single direction, increasing the flow rate of the liquid.

In this embodiment, a second groove (not shown in the figure) can be further provided on the outer surface of the needle base 4c, and an elastic ring 11c is arranged in the second groove, which can ensure that the The tightness between the needle hub 4c and the catheter hub 2c.

All documents mentioned in this application are incorporated by reference in this application as if each were individually incorporated by reference. In addition, it should be understood that after reading the above teaching content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the application.

Claims (8)

1. a kind of safety-type medical trocar with multichannel infusion channel, which is characterized in that the trochar includes：

One catheter block；

One inlying catheter, the inlying catheter are set to the front end of the catheter block；

One needle stand, the needle stand are located inside the catheter block；With

One puncture needle, the needle stand is fixed in described puncture needle one end, and the puncture needle and needle stand are what is be interconnected Hollow structure；

Wherein, described sleeve pipe needle includes puncture state and indwelling state；Under the puncture state, the puncture needle is seated in In the inlying catheter；And under the indwelling state, the puncture needle is seated in the catheter block, wherein the puncture The needle point of needle is completely retracting in the catheter block, and is not contacted with the inlying catheter；

Also, the trochar is changed into the indwelling state by the pumpback to the needle stand from the puncture state；

The needle stand is equipped with the first through hole being connected with the internal channel of the puncture needle；

The second through-hole is additionally provided on the needle stand, second through-hole is used to liquid being introduced directly into without the puncture needle Inside the catheter block；

Also, under indwelling state, the first through hole and the second through-hole form the conducting structure flowed for liquid；

The quantity of second through-hole is n, and the n is 1-20 positive integers；And

Described sleeve pipe needle further includes a pumpback component, and the pumpback component is used to that the needle stand to be driven to carry out pull, so that Described sleeve pipe needle is changed into the indwelling state from the puncture state；

The pumpback component includes needle handle Handheld Division, detachable part and the optional needle handle Handheld Division and described de- of being located at The needle handle connecting portion between portion is unloaded, wherein the front end of the detachable part is connect with the needle stand, and the needle stand can be driven Carry out pull；

Described sleeve pipe needle is additionally provided with fin, and the fin is positioned close at the head end of the catheter block and the fin tightly blocks State catheter block in residence；

The outer surface of the needle handle Handheld Division is equipped with salient point；

The detachable part is additionally provided with the observation window construction for observing blood back.

2. trochar according to claim 1, which is characterized in that the internal channel of the puncture needle is formed with first through hole and supplied The first passage of liquid flowing.

3. trochar according to claim 1, which is characterized in that the n is 1,2,3,4,5,6,7,8,9 or 10.

4. trochar according to claim 1, which is characterized in that opening court of second through-hole in the catheter block To inlying catheter.

5. trochar according to claim 1, which is characterized in that described sleeve pipe needle further includes extension tube；

Also, described extension tube one end is connected with the needle stand, and the other end is used to infuse to the needle stand.

6. trochar according to claim 1, which is characterized in that described sleeve pipe needle further includes a pumpback component, described time Component is taken out for the needle stand to be driven to carry out pull, so that described sleeve pipe needle is changed into the indwelling from the puncture state State.

7. trochar according to claim 1, which is characterized in that the inner surface of the catheter block and/or outer surface are equipped with Pumpback guide structure, for the pumpback component and/or needle stand to be guided to guide pumpback.

8. trochar according to claim 1, which is characterized in that the hub outer surface is equipped with the first position limiting structure； And

The tail portion of the catheter block is equipped with the second position limiting structure to match with first position limiting structure, so that the needle The needle stand is blocked during seat pumpback to precalculated position.