CN108339176B

CN108339176B - Safety intravenous infusion needle

Info

Publication number: CN108339176B
Application number: CN201810342084.5A
Authority: CN
Inventors: 王茹; 张薇; 王晶; 徐晓明; 董东生
Original assignee: Zhejiang Baihuo Health Technology Co ltd
Current assignee: Zhejiang Baihuo Health Technology Co ltd
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2023-07-28
Anticipated expiration: 2038-04-16
Also published as: CN108339176A

Abstract

A safe intravenous transfusion needle comprises a needle tube, a needle tube seat and a transfusion hose, and is characterized in that a flexible sleeve is sleeved outside the needle tube, the top end of the sleeve is coated with the tip end of the needle tube, the bottom end of the sleeve is connected with the sleeve seat, and the sleeve seat is sleeved outside the needle tube; the sleeve seat is connected with a sleeve seat handle, and one part of the sleeve seat handle can be contacted with the needle tube seat due to compression; an elastic component is arranged between the sleeve seat and the needle tube seat; when the needle tube seat is fixed and external force is applied to the sleeve seat to drive the needle tube seat to move towards the direction close to the needle tube seat, the elastic part is forced to deform, and the tip of the needle tube is exposed from the top end of the sleeve; the contact part of the handle of the cannula holder is pressed and fixed towards the surface of the needle holder by an operator, so that the elastic component cannot recover, and after the needle tube tip enters a vein, the pressing force of the handle of the cannula holder is reduced, so that the cannula holder is forced to move away from the needle holder due to the elastic recovery force generated by the release of the elastic potential energy of the elastic component, and finally the sharp needle tube tip is covered on the soft cannula tip.

Description

Safety intravenous infusion needle

Technical Field

The invention relates to a safe intravenous infusion needle, belonging to the technical field of medical appliances.

Background

Venipuncture and associated intravenous infusion are the most commonly used general technology in clinical departments, a needle tube without a flexible sleeve is the common puncture needle made of rigid materials, when the rigid needle tube stays in a vein for a short time such as about hours after successful puncture, the risk that the tip of the needle tube punctures the vein due to reasons such as limb movement during the stay period always exists; if the patient needs to stay for a long time, such as about several days, or the limbs of the patient are difficult to fix, an indwelling needle is usually used, wherein a flexible sleeve is sleeved outside the rigid needle tube, the tip of the rigid needle tube is exposed, the rigid needle tube is pulled out after successful puncture, so that the flexible sleeve is left in a vein, and the operation is more complicated, but the risk that the tip of the needle tube penetrates the vein due to the movement of the limbs is basically eliminated; of course, the situation that the rigid needle tube or the flexible cannula is pulled out of the vein due to the unexpected external force to cause the transfusion failure is not in the solution scope of the invention; the challenges of the individual venipuncture procedure are inevitably faced in either way, and the individual parameters, i.e., skin thickness, skin firmness, vein exposure, vein thickness, vein depth, vein wall firmness, vein bending, vein valve distribution, etc., are all substantially different for the patient.

Generally, the skin near the puncture point is disinfected at the beginning of the venipuncture process, then the finger of one hand is mainly the thumb to tighten the skin, the other hand-held needle forms a proper angle with the skin, the sharp needle tube tip is firstly penetrated into the skin, then the vein wall is broken through, the needle hole on the inclined surface of the needle tube tip enters the vein cavity, the vein pressure squeezes blood into the needle tube through the needle hole on the inclined surface, and red blood inflow, also called blood return, is seen on a needle tube window or a transparent needle tube seat or a transparent hose to be used as the basis for judging that the needle hole on the inclined surface enters the vein cavity; this blood return mode is venous pressure dependent passive blood return; however, various factors lead to the failure of visible blood return even if the needle hole of the inclined plane enters the venous lumen, such as shock patients with insufficient circulating blood volume when the venous pressure is low, so that the passive blood return mode of the venous pressure dependence is extremely insensitive; and then, as a needle hole is close to the inclined surface of the venous valve, the unidirectional flow control function of the venous valve makes the blood difficult to flow into the needle tube; the inclined surface of the needle hole clings to the vein wall, so that blood cannot enter the needle tube; also, if the inclined plane of the needle hole is positioned at the vein bending part; when these conditions occur, in which no blood return is seen, the operator usually considers that the needle hole has not entered the venous lumen yet, and further pushes the needle tube, so that the tip of the needle tube which has entered the venous lumen from one side of the venous wall is very easy to pass out from the opposite side of the venous wall, i.e. the vein is penetrated by the needle tube, which results in a failed venipuncture, and seriously affects the infusion of medicines and liquids, especially the first-aid medicines or blood cannot enter the venous lumen at the first time, which can cause rapid death or irreversible organ failure of the patient.

However, even if blood return is found in puncture, the needle tube is required to be continuously pushed into the vein for a certain distance, the needle hole on the inclined plane is ensured to completely and fully enter the vein lumen, when the direction of the vein trend cannot be judged by naked eyes, the needle tube pushing in the step is completely implemented in a blind state, the penetration failure caused by the penetration of the vein is extremely easy to occur when the tip advancing direction of the needle tube is slightly different from the vein trend, and especially, the safe needle insertion is almost luxurious when the vein trend of a patient is invisible and the vein lumen is smaller.

Furthermore, most of clinical operations use a handle connected with a needle tube seat of an infusion needle, a thumb is arranged under an upper index finger, the index finger below the needle tube seat inevitably contacts with the skin adjacent to a puncture point after being just disinfected, and when microorganisms exist on the index finger, the puncture point is extremely easy to pollute to cause related blood flow infection (CRBSI) of a pipeline, so that a great deal of clinical literature reports are presented; and the index finger positioned between the skin and the needle tube seat during operation can also influence the needle insertion angle, namely the selection of the angle between the needle tube and the skin, namely the selection of the optimal angle between the perpendicular projection line of the needle tube and the needle tube on the skin can be interfered by the index finger clamped between the needle tube and the needle tube, especially when the optimal needle insertion angle is selected to be smaller, the puncture success rate is finally reduced, the patent 01115577.9 stereoscopic vein puncture needle provides a solution, but the risk that the needle tube is pulled out from the vein due to accidental touching in the infusion process is obviously higher than the needle wings of the skin.

When the needle tube of the non-indwelling needle is used for infusion in a vein lumen, due to unavoidable limb movement, the needle hole of the inclined plane is not only easy to be attached to the vein wall to cause unsmooth infusion of liquid, but also the tip end of the needle tube can penetrate through the vein to cause infusion suspension due to relative displacement of the needle tube and the vein caused by limb movement, so that the treatment of diseases is seriously influenced.

In summary, the existing clinically used infusion needles have the following serious safety problems:

1. when blood returns, the sharp point of the infusion needle tube penetrates through the vein in the needle feeding process, so that puncture failure is caused.

2. The passive return of venous pressure dependency makes it difficult to see the return when the patient's vein is depressed or otherwise associated, and continued advancement of the needle cannula tip, which has entered the lumen of the vein, through the vein wall results in a failed puncture.

3. Because the index finger located under the needle mount during operation inevitably touches the skin immediately after sterilization adjacent to the puncture site, the puncture site is extremely contaminated when microorganisms are present on the index finger, resulting in a tube-associated blood flow infection (CRBSI).

4. The index finger positioned below the needle seat in operation can influence the needle inserting angle, namely the selection of the angle between the needle tube and the skin, so that the success rate of puncture is reduced.

5. The sharp needle tube tip of the non-indwelling needle is easy to penetrate through veins due to factors such as limb movement and the like in the infusion process.

Disclosure of Invention

The invention provides a safe intravenous infusion needle for solving the problems.

The purpose of the invention is realized in the following way:

a safety intravenous infusion needle, comprising: a needle cannula for puncturing the skin and vein walls; a needle tube seat for fixing the needle tube therein; an infusion hose connected with the inner cavity of the needle tube seat and communicated with the inner cavity of the needle tube; the needle tube is characterized in that a flexible sleeve is sleeved outside the needle tube, the top end of the sleeve is coated with the sharp needle tube tip, the bottom end of the sleeve close to one side of the needle tube seat is connected with a hollow sleeve seat inside, the sleeve seat is sleeved outside the needle tube, and the hollow diameter inside is not smaller than the outer diameter of the needle tube; the sleeve seat is connected with a sleeve seat handle, a part of which can extend to the needle tube seat area, and the part of the sleeve seat handle can be contacted with the needle tube seat due to pressure to be a sleeve seat handle contact part; at least one elastic component which can deform under external force is arranged between the sleeve seat and the needle tube seat; when the needle tube seat is fixed, external force is directly or indirectly applied to the sleeve seat through the sleeve seat handle to drive the sleeve seat to move towards the direction close to the needle tube seat, and the elastic part connected with the sleeve seat is forced to deform to store elastic potential energy, and the needle tube tip is exposed from the top end of the sleeve coated with the needle tube; the contact part of the handle of the cannula holder in the needle tube holder area is pressed and fixed to the surface of the needle tube holder by the fingers of an operator, so that the elastic component cannot recover, and after the needle tube tip enters a vein, the pressing force of the fingers on the handle of the cannula holder is reduced or relieved, so that the cannula holder is forced to move in a direction away from the needle tube holder due to the elastic restoring force generated by the release of the elastic potential energy of the elastic component, and finally the sharp needle tube tip is covered on the soft cannula tip; the elastic restoring force of the elastic component after deformation is larger than the friction force between the inner surface of the sleeve and the outer surface of the needle tube.

In order to facilitate holding, two sleeve seat handles are arranged, contact parts of the two sleeve seat handles extend to the left side and the right side of the needle tube seat, and two fingers can apply force to the two sleeve seat handles to press the two sleeve seat handles to the surface of the needle tube seat at the same time; the needle tube seat has an upper surface, a lower surface, a left side and a right side, and the lower surface is contacted with the skin when in use.

The materials selected for the components of the invention are medical materials commonly used in the art, such as Polyurethane (PU) for the sleeve, polyvinyl chloride (PVC) for the delivery hose, thermoplastic elastomer (TPE) and the like.

Preferably, the elastic component is a compression spring arranged between the sleeve seat and the needle tube seat; can be made of alloy or nonmetallic materials.

For accurate control, the device also comprises a limiting part which limits the maximum stroke of the axial relative displacement between the sleeve seat and the needle tube seat; the limiting component can be an independent pin component or a part which is matched with the handle of the cannula holder and the needle holder.

Further, at least one circumferential area of the cannula is sealingly engaged with the outer surface of the needle cannula without allowing blood and/or fluid to flow out; the sealed sleeving means that the inner diameter of the sleeve at the sleeving part is not larger than the outer diameter of the needle tube, and preferably, when no needle tube exists in the sleeve, the inner diameter of the sleeve is smaller than the outer diameter of the needle tube, so that when the sleeve is sleeved outside the needle tube, the pressure towards the periphery of the outer surface of the needle tube can be generated, and the sealed sleeving is ensured.

Preferably, the needle tube is provided with at least one blood return observation hole communicated with the inner cavity of the needle tube; the sleeve is flexible and transparent, and at least one circumferential area on the sleeve between the position corresponding to the needle tube blood return observation hole and the sleeve seat is in sealed sleeve connection with the outer surface of the needle tube so as not to flow out blood and/or liquid medicine; the peripheral area sealed between the sleeve and the outer surface of the needle tube means that the peripheral area in the sealed sleeve joint is still positioned between the needle tube blood return observation hole and the needle tube seat in the state that the tip of the needle tube is coated, so that blood and/or liquid medicine in a vein V is ensured not to flow out from a gap between the sleeve and the needle tube.

In order to generate active sensitive blood return, the needle tube seat is provided with a windowing area, and an infusion hose sleeved in the needle tube seat and positioned between the top end surface and the bottom end surface of the windowing area is exposed; the sleeve seat handle is provided with a pressing bulge at a position corresponding to the windowing region, and the pressing bulge can downwards press to enable the transfusion hose in the windowing region to be concavely deformed. When venous pressure is lower or other conditions, blood is not returned, and an operator suspects that the needle tube tip enters a vein, the handle of the cannula holder is loosened slightly to enable the pressing protrusion to lift upwards, the conveying hose in the windowing area is restored from the concave deformation state due to self elasticity, the generated negative pressure suction effect sucks the blood in the lumen of the vein tube into the inner cavity of the needle tube to easily see the blood return, and the next operation can be started with confidence.

In order to press and release the pressing of the conveying hose in the opposite window area more easily, the connection between the sleeve seat handle and the sleeve seat is a connection which can rotate up and down and comprises the application of a rotary connecting shaft, and the sleeve seat handle can rotate up and down by taking the connecting position as the shaft to be far away from or close to the upper end face of the needle seat on the basis that the sleeve seat is almost not disturbed. When the sleeve seat rotates upwards, the pressing protrusion on the handle of the sleeve seat can get rid of the limit of the top end of the windowing area to the pressing protrusion; the upward and downward rotation means that the free end of the contact part of the sleeve seat handle is upward in the direction away from the upper end face of the needle seat and downward in the direction towards the upper end face of the needle seat; the sleeve mount is nearly undisturbed, meaning that when an external force, typically an operator's finger, acts on the contact portion of the sleeve mount handle to cause it to rotate up and down, the external force does not act to synchronize rotation with the sleeve mount.

In a further simple embodiment, the connection of the cannula holder handle contact part to the cannula holder is a weak connection with a reduced local wall thickness in the lateral area, by which a rotation-axis-like effect is produced, said lateral direction being in a direction perpendicular to the central axis of the needle cannula.

The selection scheme is that the limiting component is a limiting column extending from the top end face of the needle tube seat, penetrates through a through hole at a corresponding position of the sleeve seat, and the corresponding size of the head of the limiting column is larger than that of the through hole.

Further, the limiting component is a limiting column extending from the top end surface of the needle tube seat, penetrates through the through hole at the corresponding position of the sleeve seat, and the corresponding size of the head part of the limiting column is larger than that of the through hole; the compression spring is sleeved outside the limit column.

In order to ensure possible accidents caused by the movement of limbs in the infusion process, a return blocking component for preventing the sleeve seat from moving towards the needle tube seat is arranged between the sleeve seat or the sleeve seat handle and the needle tube seat, so that the sharp needle tube tip is prevented from being separated from the soft sleeve top end due to the connection of the movement of the limbs.

The bottom surface of the handle of the sleeve seat is provided with a circular arc-shaped top part, a relatively sharp return blocking protrusion at the bottom part can slide in a groove on the surface of the needle tube seat or a corresponding part of the needle tube seat, and when the elastic part drives the sleeve seat to move to the pointed end of the needle tube, the bottom part of the return blocking protrusion abuts against the top end surface of the needle tube seat to prevent the sleeve seat from restoring to displace.

In another scheme, a through hole is arranged at the part of the sleeve seat handle extending to the needle tube seat, a blocking pin capable of moving up and down is sleeved in the through hole, the corresponding position of the needle tube seat is sunken into a pin hole, and when the sleeve seat handle is driven by the elastic component to move in place in the direction away from the needle tube seat, the blocking pin can slide into the pin hole to prevent the sleeve seat and the needle tube seat from moving relatively axially.

For better holding by an operator, the device also comprises a needle tube seat handle connected with the needle tube seat, wherein the needle tube seat handle and the sleeve seat handle can be simultaneously touched by two fingers of the operator.

In order to avoid the interference of the index finger or other fingers on the optimal needle inserting angle selection during the puncturing, the needle tube seat handle is an independent part, the needle tube seat handle is independent, the whole blade shape is formed, and the bottom section is in an inverted T shape; the upper end surface of the needle tube seat is provided with an embedded groove with a small opening and a large bottom and an inverted T-shaped cross section, and the cross section of the embedded groove is larger than the corresponding cross section of the bottom of the handle of the independent needle tube seat; when in operation, the fingers are clamped on the handles of the independent needle tube seats left and right, and the fingers do not contact the sterilized skin near the puncture points.

The needle tube seat handle is integrally in a blade shape, the upper end face of the needle tube seat is integrally connected with the needle tube seat and is a vertical needle tube seat handle, and the connection between the vertical needle tube seat handle and the upper end face of the needle tube seat is weak connection with reduced local wall thickness depending on a longitudinal rotation shaft or a longitudinal area; the handle of the vertical needle tube seat can rotate left and right relative to the needle tube seat; the longitudinal direction refers to the same direction as the central axis of the needle tube; the left-right rotation refers to left-right rotation taking the central axis of the needle tube as a rotation axis. After the venipuncture is successful, the handle of the vertical needle tube seat can be rotated to one side for fixing by the adhesive tape, and then the subsequent transfusion operation is carried out.

The other proposal is that the needle tube seat handle is a blade-shaped horizontal needle tube seat handle which is connected with the side surface of the needle tube seat; the corresponding sleeve seat handle is a blade-shaped horizontal sleeve seat handle, and the tail end of the contact part of the horizontal sleeve seat handle and the needle tube seat is provided with a bulge; the corresponding part of the needle tube seat is provided with a windowing area, and an infusion hose sleeved in the windowing area and positioned between the top end surface and the bottom end surface of the windowing area is exposed; the handle of the horizontal sleeve seat is pressed to the upper surface of the needle seat, and the protrusion of the tail end of the handle can enable the transfusion hose in the windowing area to be concavely deformed.

In another proposal, the needle tube seat handle is in a blade shape, and the left and right sheets are respectively connected with the left and right side surfaces of the needle tube seat; the handle of the sleeve seat is a thin-wall rod-shaped rod extending towards the upper end face of the needle seat; when in use, the left needle tube seat handle and the right needle tube seat handle are folded centripetally to clamp the sleeve seat handle therebetween, and the tail end of the sleeve seat handle is pressed towards the transfusion hose in the window opening area of the needle tube seat by forced extrusion, so that the transfusion hose is deformed and sunken.

The infusion apparatus comprises a bottle plug communicating device, a drip cup, a water stopper, a liquid medicine filter, an infusion hose and an intravenous infusion needle, wherein the intravenous infusion needle adopts the scheme of all the intravenous infusion needles, and the infusion apparatus hose of the infusion apparatus is connected with the intravenous infusion needle.

The beneficial effects of the invention are as follows:

1. when blood return is seen, extra operations such as finger replacement are not needed, the original position of the finger is kept, the sharp point of the needle tube can be covered by the sleeve, and the risk of puncture failure caused by penetration of the sharp point of the needle tube through veins in the continuous needle feeding process is thoroughly eliminated.

2. The sensitive active aspiration type blood return replaces an insensitive vein pressure dependent passive blood return mode, whether the needle hole of the needle tube tip inclined surface enters the vein lumen or not can be accurately and timely judged, and puncture failure caused by blind needle insertion is avoided.

3. Skin non-contact needle retention maximally avoids tube related blood flow infections (CRBSIs) caused by microbial contamination of the puncture site on the operator's finger surface.

4. The skin non-contact needle holding completely avoids the influence of the index finger below the needle tube seat on the needle inserting angle selection, thereby further improving the success rate of puncture.

5. The flexible sleeve covers the sharp needle tube tip in the infusion process, so that the risk that the needle tube tip penetrates through a vein due to factors such as limb movement is greatly reduced.

Drawings

The drawings that do not limit the invention are as follows:

fig. 1: a puncture operation schematic diagram of the existing clinical intravenous infusion needle;

Fig. 2A: schematic of the sharp tip of the needle cannula breaking through the vein wall;

fig. 2B: a schematic of the sharp tip of the needle cannula penetrating the vein wall;

fig. 2C: schematic representation of the sharp tip of the needle cannula immediately adjacent the venous valve;

fig. 2D: a pinhole enlargement of the bevel of the sharp tip of the needle cannula;

fig. 2E: a schematic drawing that the needle hole of the inclined plane of the sharp tip of the needle tube clings to the inner membrane of the vein wall;

fig. 2F: schematic representation of the sharp tip of the needle cannula being positioned within the intravenous lumen;

fig. 3A: the three-dimensional structure of the embodiment 1 of the invention is schematically shown, and the tip of the needle tube is exposed;

fig. 3B: the partial three-dimensional structure schematic diagram of the embodiment 1 of the invention, wherein the tip of the needle tube is covered by the sleeve;

fig. 4A: a schematic perspective structure of embodiment 2 of the present invention;

fig. 4B: the whole cut-away structure of the embodiment 2 of the invention is schematic, and the spring is stretched;

fig. 4C: the overall cut-away structure of embodiment 2 of the present invention is schematic, the spring is compressed;

fig. 4D: the use process state of embodiment 2 of the present invention is schematically shown with two cannula hub handles separated;

fig. 5A: the three-dimensional structure of embodiment 3 of the invention is schematically shown, and the arched elastic component is compressed;

fig. 5B: the three-dimensional structure of embodiment 3 of the invention is schematically shown, the arcuate elastic member is stretched and the return pin is prevented from sliding into the pin hole on the needle tube seat;

Fig. 6A: the partially cut-away three-dimensional structure schematic diagram of the embodiment 4 of the invention is that the infusion hose in the spring compression and windowing area is pressed and sunken;

fig. 6B: the partially cut-away three-dimensional schematic diagram of embodiment 4 of the present invention, the infusion hose in the fenestration area is restored;

fig. 6C: the embodiment 4 of the invention has a partially cut-away three-dimensional schematic structure, and the spring is stretched;

fig. 6D: the embodiment 4 of the invention is a partially cut-away three-dimensional schematic view, a spring compression and sleeve seat handle rotation shaft;

fig. 7: the three-dimensional structure and partial enlarged schematic diagram of embodiment 5 of the present invention;

fig. 8A: a schematic perspective structure of embodiment 6 of the present invention;

fig. 8B: a partially cut-away schematic illustration of embodiment 6 of the present invention;

fig. 9A: a schematic perspective structure of embodiment 7 of the present invention;

fig. 9B: the embodiment 7 of the invention is a partially enlarged three-dimensional structure schematic view of the radial opening of the needle tube seat jogged groove;

fig. 9C: a partially enlarged schematic illustration of the portion M in fig. 9A of embodiment 7 of the present invention;

fig. 9D: the use process state diagram of embodiment 7 of the present invention, wherein the independent needle cannula holder handle is removed from the needle cannula holder;

fig. 9E: the use process state of the embodiment 7 of the invention is schematically shown, and the needle tube seat is stuck and fixed by the adhesive tape;

Fig. 10A: a schematic perspective structure of embodiment 8 of the present invention;

fig. 10B: the use process state of the embodiment 8 of the invention is schematically shown, and the needle tube seat is stuck and fixed by the adhesive tape;

fig. 11A: the three-dimensional structure of embodiment 9 of the invention is schematically shown, and the spring is stretched;

fig. 11B: the use state of embodiment 9 of the present invention is schematically shown, the spring is compressed;

fig. 11C: a schematic view of the whole sectional structure along the E-E direction of fig. 11B in embodiment 9 of the present invention;

fig. 12A: the embodiment 10 of the invention is a schematic three-dimensional structure, and the springs are compressed;

fig. 12B: the embodiment 10 of the invention is a three-dimensional structure schematic diagram, and a spring is stretched;

fig. 13: the whole infusion apparatus of embodiment 11 of the invention is a schematic three-dimensional structure.

In the figure: s, skin surface; s1, subcutaneous tissue; s0. skin sanitizing area; t, thumb; F. an index finger; v, veins; v0. venous lumen; v1, a lateral vein wall; v2. contralateral vein wall; vv. venous valves; w1, a blood return observation hole of a needle tube seat; w2, a windowing area of the upper end face of the needle tube seat; w3. a fenestration area on the side of the needle cannula holder; l1, the central axis of the needle tube and the sleeve; l2, vertical projection lines of the needle tube on the skin; l3, a sleeve circumference area which is in sealing sleeve joint with the needle tube; J1. stopping with water; J2. an infusion needle connector; p, blocking the pin; A. an adhesive tape; 1. an intravenous infusion needle; 11. a needle tube; 110 needle tube inner cavity; 111. a needle cannula tip; 112. a pinhole; 113. a needle tube between the cannula holder and the needle tube holder; 114. a needle tube bottom end portion; 115 outer surface of needle tube; 116. a blood return observation hole is arranged on the needle tube; 12. a needle holder; 120. an inner cavity of the needle tube seat; 121. the top end face of the needle tube seat; 1211. a limit column extending from the top end surface of the needle tube seat; 1212. a head part of the limit column which is expanded; 122. the upper end face of the needle tube seat; 1221. a needle tube seat jogged groove; 1222. a needle tube seat jogged groove top abutting surface; 1223. the bottom end abutting surface of the needle tube seat jogged groove; 1224. the axial opening of the needle tube seat jogged groove; 1225. radial opening of the needle tube seat jogged groove; 123. the lower end face of the needle tube seat; 124. a needle tube seat side surface; 1241. a sheet-shaped wing extending from the side surface of the needle tube seat; 125. grooves on the side surface of the needle tube seat; 126. the top end surface of the side groove of the needle tube seat; 127. pin holes on the upper end surface of the needle tube seat; 128. a top end surface of the window area W2; 1281. a bottom end surface of the window area W2; 129. the bottom end surface of the needle tube seat; 13. an infusion hose; 130. an inner cavity of the transfusion hose; 131. a concave infusion hose part in the window area W2; 132. a transfusion hose portion restored from the depressed state in the window area W2; 14. a sleeve; 140. a cannula lumen; 141. the top end of the sleeve; 142. the bottom end of the sleeve; 143. the inner surface of the sleeve; 144. the top end of the sleeve is opened; 15. a sleeve seat; 150. the sleeve seat is hollow; 151. the top end surface of the sleeve seat; 152. the bottom end surface of the sleeve seat; 153. the upper end of the sleeve seat; 154. a sleeve seat side surface; 155. through holes penetrating through the top end and the bottom end of the sleeve seat; 16. a cannula holder handle; 16a. Cannula holder handle body of example 1; 16b. Cannula holder handle body of example 2; 16c. Cannula holder handle body of example 3; 16d. Cannula holder handle body of examples 4, 6; 16e. Cannula holder handle body of example 9; 161. the inner side surface of the handle of the sleeve seat; 162. the outer side surface of the handle of the sleeve seat; 163. a weak link portion of the cannula mount handle body; 164. a rotation shaft of the cannula holder handle body; 17. a contact portion of the cannula mount handle; 17a, 17b, 17c, 17d, 17e. Contact portions of cannula holder handles 16a, 16b, 16c, 16d, 16 e; 171. a limit projection on the contact portion 17 b; 172. the top end surface of the limit projection 171; 173. a return prevention protrusion on the contact portion 17 b; 174. the inclined abutment surface of the blocking projection; 175. the vertically protruding bottom end surface of the blocking protrusion; 176. a through hole in the contact portion 17c of the cannula holder handle 16 c; 177. an inner surface of the contact portion; 178. an outer surface of the contact portion; 1781. a sheet-like projection of an outer surface of the contact portion; 179. a pressing projection extending from an inner surface of the contact portion; 1791. pressing the front end surface of the bulge; 18. an elastic member; 18a, compressing the spring; 18b, an arcuate resilient member; 19. a needle tube seat handle; 19a, a removable independent needle cannula holder handle; 19b, a handle of the vertical needle tube seat which is weakly connected with the needle tube seat; 19c, a blade-shaped horizontal needle tube seat handle; 19c1, a right needle tube seat handle; 19c2, a left needle tube seat handle; 191. the upper end surface of the bottom of the needle holder handle 19 a; 192. the lower end surface of the bottom of the needle tube seat handle 19 a; 193. a longitudinal weak link portion of the needle cannula holder handle 19 b; 2. an infusion set; 21. a bottle stopper communicating vessel; 22. dropping a kettle; 23. a liquid medicine filter.

Detailed Description

The embodiments of the present invention are not limited as follows:

firstly, describing the operation process of the existing intravenous infusion needle, as shown in fig. 1, an infusion needle joint J2 is connected with a pipeline of a liquid medicine container, the liquid medicine flows into an infusion hose, air is discharged to enable the liquid medicine to drop out from an infusion needle hole, a water stopper J1 clamped on the infusion hose is closed, skin S0 near a puncture point is sterilized, the skin is stretched by the left hand, the thumb T of the right hand holds a needle seat handle 19 under an upper index finger F, an opaque needle tube 11 and the skin surface S form an angle alpha for needle insertion, the angle alpha is an included angle between a central axis L1 of the needle tube 11 and a vertical projection line L2 of the needle tube 11 on the skin surface S, correct selection of the needle insertion angle alpha determines whether puncture is successful to a certain extent, however, an index finger F positioned between the needle seat 12 and the skin surface S is easy to pollute the sterilized skin and seriously interfere with the selection, especially when a smaller needle insertion angle is required, and the needle insertion angle alpha is required to be regulated down at any time to ensure that the tip 111 is positioned at the center of the intravenous tube V0, the needle insertion angle is reduced when the needle insertion angle is required to be carried out, and the needle insertion angle alpha is possibly reduced at any time; in the needle insertion process, as shown in fig. 2A, the needle tip 111 pierces the skin surface S and breaks through the nearest vein wall V1 through the subcutaneous tissue S1, at this time, part of the needle hole 112 is located in the vein lumen V0, the pressure in the vein forces the blood into the needle tube and the infusion tube 13, and red or dark red blood return is observed on the transparent or semitransparent blood return observation hole W1 of the needle tube seat 12 and on the transparent or semitransparent infusion tube 13; to ensure that the needle 112 is completely within the intravenous lumen V0 after flashback is observed, the needle cannula 11 is lowered, i.e., the needle insertion angle α is reduced, and the needle insertion is continued, typically by a distance of several millimeters; if the vein lumen V0 is thinner, the vein is obviously bent, the needle inserting angle alpha is not good, the operator is not skilled, and the like, the process is very easy to fail, and the sharp point 111 of the needle tube 11 shown in FIG. 2B penetrates through the contralateral vein wall V2, so that the puncture is completely failed; as another example, when the sharp tip 111 of the needle tube 11 is located next to the venous valve Vv as shown in fig. 2C, it is difficult for blood to return when the needle hole 112 is attached to the venous valve Vv, and there are cases where the sharp tip 111 of the needle tube 11 penetrates the venous valve Vv but blood does not return, and as shown in fig. 2E, the needle hole 112 of the inclined surface of the sharp tip 111 of the needle tube 11 is located next to the intima of the venous wall, fig. 2D shows the inclined needle hole 112 in an enlarged manner, and in these cases, the operator usually judges that the needle hole 112 has not entered the venous lumen V0, and continues needle penetration until the final penetration of the through vein V fails.

When the puncture is successful, as shown in fig. 2F, the sharp tip 111 of the needle tube 11 is positioned in the lumen of the vein for infusion of liquid, the sharp tip 111 of the needle tube 11 without the protection of the cannula 14 is displaced due to the movement of the limb caused by various reasons including coughing, turning over, etc., and the situation shown in fig. 2B is very easy to penetrate the vein V.

Example 1:

as shown in fig. 3A and 3B, embodiment 1 of the present invention includes: a needle cannula 11 having a hollow interior 110 for piercing the skin and vein walls, typically of metallic material; a cylindrical hollow needle tube holder 12 made of medical resin for fixing the needle tube 11 therein, the inner surface of the needle tube holder cavity 120 being firmly sealed and sleeved with the outer surface of the needle tube bottom end portion 114; the outer surface of the infusion hose 13 made of medical resin is firmly sealed and adhered with the surface of the inner cavity 120 of the needle tube seat 12 to ensure that the inner cavity 130 of the infusion hose is communicated with the inner cavity 110 of the needle tube; the outer surface 115 of the needle tube 11 is sleeved with a flexible sleeve 14 made of medical resin, as shown in fig. 3B, the top end 141 of the sleeve 14 is coated with a sharp needle tube tip 111, the sleeve bottom end 142 near one side of the needle tube seat 12 is connected with a sleeve seat 15 made of medical resin with hollow inside, part of the outer surface of the sleeve bottom end 142 is adhered with the surface of the hollow part of the sleeve seat 15 into a whole, or the sleeve is put into a mould cavity for forming the sleeve seat to be injection molded so as to connect the sleeve seat and the sleeve seat into a whole; the sleeve seat 15 is sleeved outside the needle tube 11, and the hollow diameter inside is not smaller than the outer diameter of the needle tube; the cannula holder 15 is connected with a cannula holder handle 16 with a part extending to the area of the needle tube holder 12, the cannula holder handle 16 can be a part of the cannula holder 15 or can be an independent part and is connected with the cannula holder 15 into a whole, the cannula holder handle 16a of the embodiment is an extending part from the upper end surface of the cannula holder 15 to the direction of the needle tube holder 12, the main body is in a thin rod shape, and a contact part 17a in the area of the needle tube holder 12 is wider than the main body and is an arc-shaped sheet with the shape consistent with the shape of the top end surface of the cylindrical needle tube holder 12, so that the pressing operation of a finger mainly is a thumb T on the contact part; the contact portion 17a of the cannula holder handle may be provided with a small clearance from the upper end surface of the needle cannula holder 12 or may be provided without clearance but slidable thereon; a compression spring 18a made of metal or nonmetal material which is subjected to compression deformation by external force is arranged between the bottom end face 152 of the sleeve seat 15 and the top end face 121 of the needle tube seat, and the compression spring 18a is sleeved on the needle tube 113 between the sleeve seat 15 and the needle tube seat 12; when the needle tube holder 12 is held and fixed by fingers of one hand, the tip end surface 151 of the sleeve holder is pressed by fingers of the other hand to move in a direction approaching the needle tube holder 12, the sleeve 14 is synchronously moved so that the needle tube tip 111 is exposed from the coating of the sleeve tip 141, and the compression spring 18a clamped between the sleeve holder 15 and the needle tube holder 12 is compressed to store elastic potential energy, and the state is as shown in fig. 3A, when in use, the index finger F of one hand is positioned at the lower end surface 123 of the needle tube holder, the thumb T presses and closely contacts the sleeve holder handle contact portion 17a to the upper end surface 122 of the needle tube holder, and enough friction force is generated so that the sleeve holder 15 does not move to the needle tube tip 111 side due to the elastic restoring force of the compression spring; the needle tube tip 111 is exposed from the cannula tip 141 in the state shown in fig. 3A, and then the clamping force between the index finger F and the thumb T is moderately relaxed after blood returns is seen to the venipuncture, so that the friction force between the cannula holder handle contact part 17a and the upper end surface 122 of the needle tube seat is smaller than the elastic restoring force of the compression spring 18a, the original position of the finger is kept without changing the finger, the cannula seat 15 can move towards one side of the needle tube tip 111, the cannula tip 141 covers the needle tube tip 111, at the moment, the clamping force between the index finger F and the thumb T is increased to adjust the needle inserting angle alpha to continue needle inserting by a plurality of millimeters, the needle inserting continuing process is carried out on the basis that the needle tube tip 111 is covered by the flexible cannula tip 141, the opposite side vein wall V2 shown in fig. 2B is not pierced, and the success of puncture is ensured to the greatest extent; while also reducing the risk of needle cannula tip 111 penetrating the vein due to any limb movement during infusion.

When the present embodiment is designed such that the hub handle contact portion 17a is in close contact with the needle hub upper end surface 122, the elastic restoring force of the compression spring 18a after being compressed should be greater than the frictional force between the hub handle contact portion 17a and the needle hub upper end surface 122 without the intervention of a finger.

To reduce resistance during penetration, cannula tip opening 144 is tapered toward the central axis L1 of the cannula or cannula, which facilitates penetration of cannula tip 141 into the skin and vein along with cannula tip 111.

Because needle cannula 11 is sleeved in lumen 140 of cannula 14, preferably a gap is left between cannula inner surface 143 and needle cannula outer surface 115 which provides minimal resistance to relative movement, but at least one circumferential region L3 is sealingly sleeved so as not to allow blood and/or fluid to flow out of the gap therebetween; the outflow refers to that a part of the needle tube 11 and the sleeve 14 are exposed to the outside of the body during transfusion, and the positive pressure higher than the atmospheric pressure exists in the venous lumen V0, so that if the gap between the needle tube 11 and the sleeve is not sealed by the circumference, blood and/or liquid medicine can flow out of the body from the gap due to the existence of a pressure difference; the sealed sleeving means that the inner surface 143 of the sleeve part of the peripheral area L3 is at least annular or ring-shaped and is tightly contacted with the outer surface 115 of the needle tube at the position, namely the sleeve at the position has certain inward wrapping pressure on the outer surface 115 of the needle tube; inward refers to toward the central axis L1 of the needle cannula or sleeve.

Example 2:

as shown in fig. 4A, unlike embodiment 1, the cannula holder handle 16 of this embodiment is provided with left and right handles 16b extending from the cannula holder side 154, the contact portion 17b of the handles 16b being located at the needle holder side 124; as shown in fig. 4B, the two side surfaces 124 of the needle tube holder are provided with axially-extending grooves 125, and a part of the contact portion 17B of the handle 16B protruding into the grooves 125 is a limiting projection 171 as a limiting member, and the limiting projection 171 is axially slidable in the grooves 125 until the tip end surface 172 of the limiting projection 171 abuts against the tip end surface 126 of the grooves 125, thereby limiting the movement of the cannula holder handle 16B in the direction of the needle tube tip 111.

Because the left sleeve seat handle 16b and the right sleeve seat handle 16b are arranged, when in use, the thumb T and the index finger F are respectively pressed against the two contact parts 17b of the needle seat side 124, so that the needle seat moves synchronously with the needle seat 12 to perform puncture operation, the lower end surface 123 of the needle seat can not be basically contacted with the skin disinfection area S0, and the risk of finger pollution of a puncture point is reduced to the greatest extent; at the same time, the interference of the index finger F between the needle holder 12 and the skin surface S in the embodiment 1 on the correct selection of the needle inserting angle alpha is eliminated, and the success rate of puncture is improved.

Further, as shown in fig. 4C, each contact portion 17b of the two cannula holder handles 16b protrudes toward the recess 125 and includes a back-blocking protrusion 173 in addition to the stopper protrusion 171, the back-blocking protrusion 173 having an inclined abutment surface 174 and a vertically protruding bottom end surface 175, the back-blocking protrusion 173 being slidable within the recess 125, when the contact portion 17b of the cannula holder handle 16b moves toward the needle tip 111 by restoring the state of the compression spring 18a, the top end surface 126 of the recess 125 is unable to block the inclined abutment surface 174 of the back-blocking protrusion 173, the back-blocking protrusion 173 slides out of the recess 125, and eventually the vertically protruding bottom end surface 175 of the back-blocking protrusion 173 abuts against the needle holder top end surface 121, so that the cannula holder 15 is unable to move when subjected to an axial external force in a direction away from the needle tip 111, i.e., the cannula 14 having covered the needle tip 111 is prevented from going back, ensuring that the needle tip 111 is continuously covered by the cannula tip 141 during transfusion, and the risk of extending through the vein V due to movement is reduced.

A through hole is formed on the upper wall of the tube body of the needle tube 11 to be a blood return observation hole 116, as shown in fig. 4A, at least the part of the sleeve 14 near the blood return observation hole 116 is transparent or semitransparent so as to facilitate visual observation, and generally, the whole sleeve adopts a transparent material formula; because the blood return observation hole 116 is formed on the needle tube 11 and is nearer to the venous lumen V0, blood return is easier to occur at the nearer position under the same venous pressure, and an operator is helped to judge whether the needle hole 112 enters the venous lumen V0 or not timely and accurately; the cannula 14 between the location corresponding to the flashback port 116 of the needle cannula 11 and the cannula hub top end surface 151 is provided with a circumferential region L3, wherein the inner cannula surface 143 on the circumferential region L3 is in sealing contact with the outer cannula surface 115, and the sealing contact or sealing sleeve joint means that blood and or liquid medicine in the intravenous lumen V0 cannot pass through the region during transfusion, and the pressure contact between the blood and the liquid medicine without gaps, the non-pressure contact without gaps are included, even small gaps are allowed, because the viscosity of the blood and the liquid medicine is several times or tens times that of water, and the large surface tension can prevent the blood and the liquid medicine from passing through the small gaps.

In use, as shown in FIG. 4D, the two cannula holder handles are first separated, and then the cannula holder top surface 151 is pressed to compress the spring 18a, the needle cannula tip 111 is exposed from the cannula tip 141, and the thumb T and forefinger F are respectively pressed against the two contact portions 17b of the cannula holder handle 16b and the needle cannula holder side 124 to move in synchronism with the needle cannula holder 12 for performing a puncturing operation.

Example 3:

as shown in fig. 5A, in the difference from the foregoing embodiment, the elastic member 18 of embodiment 3 located between the cannula holder 15 and the needle cannula holder 12 is an arcuate elastic member 18b, and the arcuate main body is deformed outwardly to store energy after receiving the axial pressure from the tip end surface 151 of the cannula holder; a through hole 176 is arranged on the contact part 17c of the handle 16c extending from the upper end 153 of the sleeve seat, a blocking pin P is sleeved in the through hole 176, and the main body of the blocking pin P is columnar and can slide up and down in the through hole; a pin hole 127 is formed in the upper end surface 122 of the needle holder, and a contact portion 17c of the cannula holder handle 16c is axially movable on the upper end surface 122 of the needle holder; as shown in fig. 5B, when the blocking pin P received in the through hole 176 is facing the pin hole 127 on the needle hub upper end surface 122, the blocking pin P may be dropped or pressed into the pin hole 127 to thereby prevent the cannula hub handle 16c from moving back.

Example 4:

in order to allow for the first time of blood return once needle tip 111 with needle hole 112 enters intravenous lumen V0 during the puncturing process, in this embodiment, as shown in fig. 6A and 6B, the upper end surface of the needle holder is provided with a partially material-missing fenestration area W2, and a portion of infusion hose 132 located in needle holder lumen 120 is directly exposed between top end surface 128 and bottom end surface 1281 of fenestration area W2; the cannula holder handle 16d extending from the cannula holder upper end 153 is connected with the contact part 17d in a vertically rotatable manner, wherein the vertical rotation is that the upper end surface 122 of the proximal needle holder is lower, and the upper end surface of the proximal needle holder is upper; the up and down rotatable structure shown in fig. 6A is a laterally localized reduced wall thickness weak link 163 on the body of the cannula holder handle 16 d; fig. 6D shows another structure that can be rotated up and down, with the connection of the cannula holder handle 16D and the contact part 17D being mediated by the rotation shaft 164.

When the compression spring 18a is compressed and the needle tube tip 111 is exposed and the thumb T is pressed from the outer surface 178 of the contact portion 17d in use, the contact portion 17d rotates downwards by taking the transverse weak connection portion 163 as the axis to enable the pressing protrusion 179 to press down the transfusion tube 132 in the windowing region W2 to be concavely deformed, the liquid medicine in the concavely deformed transfusion tube 131 flows out of the needle tube 11 from the needle hole 112, when the needle hole 112 enters the intravenous tube cavity V0 along with the puncturing process, an operator usually has a breakthrough feeling, at the moment, the pressing force of the thumb T on the contact portion 17d is reduced manually, so that the concavely pressed transfusion tube 131 is restored from the concave state by the self elastic restoring force of the thumb T, as shown in fig. 6B, the negative pressure attractive force generated by the state restoration of the concavely pressed transfusion tube 131 to the transfusion tube 132 and the released space lead blood from the intravenous tube cavity V0 to the initiative suction tube 110 even the initiative tube 130, and the blood in the blood return position close to the tip 111 can be timely observed back to the needle tube 116, and the blood return can be timely observed at the first time; immediately after blood return, the thumb T is further loosened, the friction force between the pressing projection 179 and the transfusion hose 132 is completely or partially eliminated, the elastic restoring force of the compression spring 18a drives the sleeve seat 15 to axially move so that the sleeve top end 141 covers the needle tube tip 111, at this time, the front end surface 1791 of the pressing projection 179 abuts against the top end surface 128 of the windowing region W2 as shown in FIG. 6C, the generated limiting action makes the sleeve 14 unable to continuously axially move in a direction away from the needle tube seat 12, and the limiting action counteracts the moving speed of the sleeve seat 15 and excessive displacement caused by misoperation due to the elastic restoring force driving of the compression spring 18 a.

Further, thumb T continues to press against contact portion 17d for several millimeters, ensuring that needle aperture 112 is fully positioned within venous lumen V0, which is most likely to touch vein wall V1 or V2, but because flexible cannula tip 141 covers sharp needle tip 111, the risk of puncture failure through vein wall V1 or V2 is completely eliminated or minimized.

Example 5:

as shown in fig. 7, this embodiment illustrates another limiting structure, and the top end surface 121 of the needle tube seat extends axially to form a rod-shaped limiting post 1211, preferably with a circular cross section; the sleeve holder 15 has a through hole 155 penetrating the top surface 151 and the bottom surface 152, and the stopper post 1211 passes through the through hole 155, and the stopper post 1211 passing through the through hole 155 has an enlarged head 1212, wherein the enlarged head 1212 has an outer diameter larger than the inner diameter of the through hole 155, and when the elastic member 18a is in the recovery state, the stopper post enlarged head 1212 abuts against the sleeve holder top surface 151, thereby restricting further axial movement in the direction of the needle tube tip 111.

Example 6:

as shown in fig. 8A, the difference from embodiment 5 is that the compression spring 18A of the elastic member 18 of this embodiment is sleeved on the limit post 1211, so that the compression damage of the hard compression spring 18A to the skin surface during transfusion is avoided; the same cannula holder handle 16d contacts portion 17d and fenestration area W2 of the needle cannula holder as in example 4; also included is the same return blocking feature, namely return blocking boss 173, as in embodiment 4; fig. 8B is a schematic view of a partially cut-away structure along the central axis of the stopper post 1211.

Example 7:

as shown in fig. 9A, in order to thoroughly avoid the above-mentioned drawbacks caused by the finger being pinched between the needle tube holder 12 and the skin surface S during the puncturing operation, the present invention further includes a needle tube holder handle 19 for facilitating finger holding, the present embodiment shows a detachable needle tube holder handle 19A having a blade shape, the bottom of the needle tube holder handle 19A connected to the needle tube holder is in a shape of inverted T in cross section, the bottom of the needle tube holder handle 19A is integrally inserted into the insertion groove 1221 provided at the upper end face 122 of the needle tube holder, the hollow cross section of the insertion groove 1221 is in an inverted T shape corresponding to the cross section of the bottom of the needle tube holder handle 19A, the insertion groove 1221 has an axial strip-shaped axial opening 1224 provided at the upper end face 122 of the needle tube holder and a radial opening 1225 provided at the bottom end face 129 of the needle tube holder, and the bottom of the needle tube holder handle 19A is inserted into the insertion groove 1221 from the radial opening 1225 provided at the bottom end face 129 of the needle tube holder.

For active and sensitive blood return, window areas W3 are arranged on two side surfaces 124 of the needle tube seat, and fingers holding the needle tube seat handle 19a can directly press the exposed transfusion hose 132 in the window areas W3; in order to simultaneously cover the needle tip 111 in time when blood return is seen and avoid penetration of the vein V into the needle, the present embodiment employs the same cannula holder handle 16b as in embodiment 2, and the negative pressure is generated by pressing the infusion hose 132 with the pressing projection 179 on the contact portion 17 b.

Fig. 9B is a partially enlarged perspective view of the radial opening of the fitting groove of fig. 9A.

In operation, the thumb T and index finger F grips the needle cannula holder handle 19a and applies a force, as shown in FIG. 9C, the lower end surface 192 of the bottom of the needle cannula holder handle 19a is separated from the abutment surface 1223 of the bottom of the engaging groove or the force therebetween is reduced, the upper end surface 191 of the bottom of the needle cannula holder handle 19a is brought into close contact with the abutment surface 1222 of the top of the engaging groove, and at the same time, the finger is pressed against the cannula holder contact portion 17b located on the side surface 124 of the needle cannula holder, pressing the infusion hose 132 to be depressed by the pressing projection 179, and then the above-described process is continued.

After successful penetration, the needle cannula holder handle 19a is withdrawn from the fitting groove 1221 as shown in fig. 9D.

In order to better fix the needle holder 12 during infusion, the side 124 of the needle holder extends out of the tab 1241, which increases the contact area and facilitates the adhesive fixation of the tape a, as shown in fig. 9E.

Example 8:

similar to the problem to be solved in example 7, as shown in fig. 10A, the vertical needle holder handle 19B, which is weakly connected to the lancet holder, is located on the upper end surface 122 of the needle holder, and functions as the handle 19a in example 7 during puncturing, but the connection between the needle holder handle 19B and the upper end surface 122 of the needle holder is in a state as shown in fig. 10B, in which the connection between the needle holder handle 19B and the upper end surface 122 of the needle holder is rotatable left and right, that is, the rotation in the direction of the side surface 124 of the needle holder about the central axis L1 of the needle tube is performed, and this embodiment shows the needle holder handle 19B with the weak connection 193, which has a reduced partial wall thickness with the upper end surface 122 of the needle holder, is capable of being reversed to contact with the skin surface S to be fixed by adhesion of the adhesive tape a after puncturing.

Example 9:

as shown in fig. 11A, this embodiment is different from embodiments 4 and 8 in that the needle tube holder side 124 is provided with two blade-shaped handles 19c, a right needle tube holder handle 19c1, a left needle tube holder handle 19c2; the contact portion 17e of the cannula holder handle 16e is located on the cannula holder upper end surface 122, and the contact portion 17e has an axial tab-like protrusion 1781 on its outer surface 178, with the larger area of the axial tab-like protrusion 1781 facilitating gripping by the hub handles 19c1, 19c2 being folded in a centripetal fashion about the central axis L1 of the cannula toward the cannula holder upper end surface 122.

In operation, as shown in FIG. 11B, thumb T and index finger F clamp needle hub handles 19c1, 19c2 with relative force to clamp tab-like projections 1781 of contact portion 17e of cannula hub handle 16e therein, which are movable in synchronism with needle hub handles 19c1, 19c2; the thumb T and index finger F pinch the needle hub handles 19c1, 19c2 to generate a downward force component to the contact portion 17e of the cannula hub handle 16e such that the pressing projection 179 on the inner surface 177 thereof indents the infusion tube 132 in the fenestration area W2, and the lowering of the relative clamping force of the thumb T and index finger F lifts the pressing projection 179 in the fenestration area W2 such that the recessed infusion tube 131 triggers a sensitive flashback during elastic recovery, and then continues to pinch the cannula hub handles 19c1, 19c2 and the contact portion 17e of the cannula hub handle 16e therein, completing the foregoing continued needle insertion. FIG. 11C is a schematic view of the overall cut-away structure of FIG. 11B along the direction E-E.

Implementation 10:

as shown in fig. 12A, 12B, the right needle cannula holder handle 19c1, while the contact portion 17F of the cannula holder handle 16F is in the form of a blade radially projecting rightward, so that the thumb T is brought into press contact with the hand during operation, while the index finger F is located below the needle cannula holder handle 19c 1; the design ensures that the two leaf-shaped handles are overlapped in the horizontal direction, and the contact area of fingers is large, so that the operation habit of a certain number of clinical nursing staff is met; the clamping force between the thumb T and the index finger F is reduced in the puncturing process, so that the pressing protrusion 179 in the windowing area W2 is lifted upwards, the shape of the concave infusion hose 132 is restored to trigger sensitive blood return, and then the upper and lower overlapped handles are continuously clamped to complete the needle feeding process.

Implementation 11:

referring to fig. 13, there is shown an infusion set 2 comprising a bottle stopper communicating vessel 21, a drip cup 22, a water stopper J1, a liquid medicine filter 23, an infusion hose 13 and an iv needle 1, which is different from the existing clinical infusion set in that the iv needle 1 is the iv needle 1 described in the above-mentioned embodiments and the present invention, and the infusion hose 13 of the infusion set 2 is connected to the iv needle 1; the water stopper J1 in the embodiment has the same function as the water stopper J1 in FIG. 1 for clamping the infusion hose 13 but has a flow rate adjusting function; when a non-flexible medical fluid container (not shown) which is not easily deformed inward is used, the stopper communication vessel 21 is usually connected with a side branch air inlet pipe as shown in fig. 13.

Claims

1. A safety intravenous infusion needle, comprising: a needle cannula (11) for puncturing the skin and vein walls; a needle tube seat (12) for fixing the needle tube (11) therein; an infusion hose which is connected with the inner cavity (120) of the needle tube seat (12) and is communicated with the inner cavity (110) of the needle tube; the needle tube is characterized in that a flexible sleeve (14) is sleeved outside the needle tube (11), the sharp needle tube tip (111) is covered by the sleeve top end (141), a sleeve seat (15) with an inner hollow (150) is connected to the sleeve bottom end (142) close to one side of the needle tube seat (12), the sleeve seat (15) is sleeved outside the needle tube (11), and the diameter of the inner hollow (150) is not smaller than the outer diameter of the needle tube; the cannula holder (15) is connected with a cannula holder handle (16) of which a part can extend to the area of the needle tube holder (12), and a part of the cannula holder handle (16) can be contacted with the needle tube holder (12) as a cannula holder handle contact part (17) due to pressure; at least one elastic component (18) which can deform under the action of external force is arranged between the sleeve seat (15) and the needle tube seat (12); when the needle tube seat (12) is fixed, external force is directly or indirectly applied to the cannula seat (15) through the cannula seat handle (16) to drive the cannula seat to move towards the direction approaching the needle tube seat (12), and the elastic part (18) connected with the needle tube seat is forced to deform to store elastic potential energy, and the needle tube tip (111) is exposed from the cannula top end (141) coated with the needle tube tip; the contact part (17) of the cannula holder handle (16) in the region of the needle tube holder (12) is pressed and fixed towards the surface of the needle tube holder (12) by the fingers of an operator, so that the elastic component (18) cannot recover, after the needle tube tip (111) enters a vein (V), the pressing force of the fingers on the cannula holder handle is reduced or relieved, the cannula holder (15) can be forced to move away from the needle tube holder (12) due to the elastic restoring force generated by the release of the elastic potential energy of the elastic component (18), and finally the soft cannula tip (141) covers the sharp needle tube tip (111); the elastic restoring force of the elastic part (18) after deformation is larger than the friction force between the inner surface of the sleeve (14) and the outer surface of the needle tube (11); the needle tube seat (12) is provided with a windowing area (W2) which exposes an infusion hose sleeved in the windowing area and positioned between the top end surface (128) and the bottom end surface (1281); the sleeve seat handle (16) is provided with a pressing protrusion (179) at a position corresponding to the windowing region (W2), and the pressing protrusion (179) can downwards press to enable the transfusion hose in the windowing region (W2) to be concavely deformed.

2. A safety intravenous infusion needle according to claim 1, wherein there are two cannula holder handles (16), the contact portions (17) of which extend to the left and right sides of the needle holder (12), and two fingers are forced to press them simultaneously against the surface of the needle holder (12).

3. A safety intravenous infusion needle according to claim 1, wherein the resilient member (18) is a compression spring arranged between the cannula holder (15) and the needle holder (12).

4. A safety intravenous infusion needle according to claim 1, further comprising a limiting member defining a maximum stroke of axial relative displacement between the cannula holder (15) and the needle cannula holder (12).

5. A safety intravenous infusion needle according to claim 1, wherein at least one peripheral region (L3) of the cannula (14) is sealingly engaged with the outer surface of the needle cannula (11) without allowing blood and/or medical fluid to flow out.

6. A safety intravenous infusion needle according to claim 1, wherein the needle tube (11) is provided with at least one blood return viewing port (116) in communication with the interior cavity (110) of the needle tube; the sleeve (14) is flexible and transparent, and at least one circumferential area (L3) on the sleeve (14) between the position corresponding to the needle tube blood return observation hole (116) and the sleeve seat (15) is in sealed sleeving connection with the outer surface of the needle tube (11) so as not to enable blood and/or liquid medicine to flow out.

7. A safety intravenous infusion needle according to claim 1, wherein the connection between the cannula holder handle (16) and the cannula holder (15) is a rotatable connection up and down including the application of a rotational shaft (164), the cannula holder handle (16) being rotatable up and down away from or towards the upper end face (122) of the needle holder (12) with the connection being a shaft on the basis of the cannula holder (15) being nearly undisturbed; when rotated upwards, the pressing projection (179) on the cannula holder handle (16) can be released from the restriction of the top end surface (128) of the windowing region.

8. A safety intravenous infusion needle according to claim 7, wherein the connection of the cannula holder handle (16) contact portion (17) to the cannula holder (15) is a weak connection (163) with reduced local wall thickness in the lateral area.

9. The safe intravenous infusion needle according to claim 4, wherein the limiting component is a limiting post (1211) extending from the top end surface (121) of the needle tube seat (12), and penetrates through the through hole (155) at the corresponding position of the sleeve seat (15), and the head (1212) of the limiting post (1211) has a corresponding size larger than that of the through hole (155).

10. The safe intravenous infusion needle according to claim 4, wherein the limiting component is a limiting column (1211) extending from the top end surface (121) of the needle tube seat (12), a through hole (155) passing through the corresponding position of the sleeve seat (15), and the head (1212) of the limiting column (1211) has a corresponding size larger than that of the through hole (155); the compression spring (18 a) is sleeved outside the limit post (1211).

11. A safety intravenous infusion needle according to claim 1, wherein a return blocking member is provided between the cannula holder (15) or cannula holder handle (16) and the cannula holder (12) to prevent movement of the cannula holder in the direction of the cannula holder (12) and to prevent removal of the sharp cannula tip (111) from the flexible cannula tip (141).

12. A safety intravenous infusion needle according to claim 11, wherein the bottom surface of the cannula holder handle (16) is provided with a back-blocking protrusion (173) with a top inclined round and a relatively sharp bottom, which is slidable in a recess (125) in the surface of the cannula holder (12) or in a corresponding portion of the cannula holder (12), and when the elastic member (18) drives the cannula holder (15) to move into position towards the needle tip (111), the bottom end surface (175) of the back-blocking protrusion (173) protrudes vertically and abuts against the top end surface (121) of the cannula holder (12), preventing the cannula holder (15) from being displaced back.

13. The safe intravenous infusion needle according to claim 11, wherein a through hole (176) is formed in a portion of the cannula holder handle (16) extending to the needle tube holder (12), a blocking pin (P) capable of moving up and down is sleeved in the through hole (176), the corresponding position of the needle tube holder (12) is recessed into a pin hole (127), and when the cannula holder handle (16) is driven by the elastic component (18) to move in place in a direction away from the needle tube holder (12), the blocking pin (P) can slide into the pin hole (127) to prevent relative axial movement of the cannula holder (15) and the needle tube holder (12).

14. A safety intravenous infusion needle according to claim 1, further comprising a needle hub handle (19) connected to the needle hub (12), the needle hub handle (19) and cannula hub handle (16) being simultaneously accessible by two fingers of an operator.

15. A safety intravenous infusion needle according to claim 14, wherein the needle cannula holder handle (19) is a separate component, the separate needle cannula holder handle (19 a), the integral blade, the bottom section being inverted T-shaped; the upper end surface (122) of the needle tube seat (12) is provided with an embedded groove (1221) with a small opening and a large bottom and an inverted T-shaped cross section, and the cross section of the embedded groove (1221) is larger than the bottom cross section of the corresponding independent needle tube seat handle (19 a).

16. A safety intravenous infusion needle according to claim 14, wherein the needle cannula holder handle (19) is integrally formed as a blade, the needle cannula holder (12) upper end surface (122) is integrally formed with the needle cannula holder (12) as a vertical needle cannula holder handle (19 b), and the connection between the vertical needle cannula holder handle (19 b) and the needle cannula holder (12) upper end surface (122) is a weak connection (193) comprising a reduction in local wall thickness depending on the longitudinal rotation axis or longitudinal region; the handle (19 b) of the vertical needle tube seat can rotate left and right relative to the needle tube seat (12).

17. A safety intravenous infusion needle according to claim 14, wherein the needle cannula holder handle (19) is a blade-like horizontal needle cannula holder handle (19 c) connected to the side (124) of the needle cannula holder (12); the corresponding sleeve seat handle (16) is a blade-shaped horizontal sleeve seat handle (16), and a bulge (179) is arranged at the tail end of a contact part (17) between the horizontal sleeve seat handle (16) and the needle tube seat (12); a window opening area (W2) is arranged at the corresponding part of the needle tube seat (12), and an infusion hose sleeved in the window opening area and positioned between the top end surface (128) and the bottom end surface (1281) of the window opening area is exposed; the horizontal syringe holder handle (16) is pressed against the upper end face (122) of the syringe holder (12), and the distal projection (179) thereof can deform the transfusion hose recess in the window area (W2).

18. The safe intravenous infusion needle according to claim 14, wherein the needle tube seat handle (19) is blade-shaped, and the left (19 c 2) and the right (19 c 1) are respectively connected with the left side surface and the right side surface of the needle tube seat (12); the sleeve seat handle (16) is in a thin-wall rod shape extending towards the upper end face (122) of the needle tube seat (12); when in use, the left needle tube seat handle and the right needle tube seat handle are folded centripetally to clamp the cannula seat handle (16) between the two needle tube seat handles, and the end projections of the cannula seat handle (16) are pressed towards the transfusion hose in the windowing area (W2) of the needle tube seat (12) by forced extrusion, so that the transfusion hose is deformed and recessed.

19. An infusion apparatus comprises a bottle plug communicating vessel (21), a drip cup (22), a water stopper (J2), a liquid medicine filter (23), an infusion hose and an intravenous infusion needle (1), and is characterized in that the intravenous infusion needle is the intravenous infusion needle (1) according to any one of the technical schemes of claims 1-18, and the infusion apparatus hose of the infusion apparatus is connected with the intravenous infusion needle (1).