CN108434550B

CN108434550B - Safety type venous indwelling needle

Info

Publication number: CN108434550B
Application number: CN201810342083.0A
Authority: CN
Inventors: 王茹; 张薇; 张琳琳; 徐晓明; 董东生
Original assignee: Beijing Yangsheng Hengtai Technology Co ltd
Current assignee: Zhejiang Baihuo Health Technology Co.,Ltd.
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2020-06-16
Anticipated expiration: 2038-04-16
Also published as: WO2019201093A1; CN108434550A

Abstract

A safety type venous indwelling needle comprising: a needle tube, a needle tube seat and a sleeve; the needle tube seat and the sleeve seat are sleeved with each other, the sleeved parts can mutually guide and axially slide relative to each other, and the axial shaft refers to the central axis of the needle tube and the sleeve; at least one elastic component which can deform under the action of external force and comprises a selectable compression spring is arranged between the needle tube seat and the cannula seat; the needle tube seat handle is provided with a contact part which can contact the cannula seat under the driving of external force; the contact member may be an area of the needle hub handle that is accessible to the cannula hub; or a movable part extending from the handle of the needle cannula holder and being deformable by an external force, such as a flap-like extension from the handle of the needle cannula holder, wherein at least one part of the contact part is in contact with a part of the area of the cannula holder.

Description

Safety type venous indwelling needle

Technical Field

The invention relates to a safe venous indwelling needle, belonging to the technical field of medical instruments.

Background

Venipuncture and associated venous transfusion are the most common general techniques used in clinical departments, and when the transfusion time is long, an indwelling needle with a flexible cannula is most often used, and the flexible cannula eliminates the risk of puncturing the vein due to the tip of the needle tube during indwelling; the challenge of individualizing the venipuncture procedure, i.e., the skin thickness, skin hardness, vein exposure, vein thickness, vein depth, vein wall hardness, vein curvature, vein valve distribution, etc., of patients are all quite different, no matter what kind of intravenous needle is, inevitably facing the challenge of individualizing the venipuncture procedure; individualized venipuncture also requires consideration of the personalization of the nurse's procedure.

Generally, in a venipuncture process using an indwelling needle, the skin near a puncture point is disinfected at the beginning, then the skin is tightened by a finger of one hand mainly using a thumb, the sharp needle tube tip is firstly punctured into the skin by holding the needle of the other hand at a proper angle with the skin, then the vein wall is broken through, a needle hole on the inclined plane of the needle tube tip enters a vein lumen, blood is squeezed into the needle tube through the needle hole on the inclined plane by venous pressure, 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 and is used as a basis for judging that the needle hole on the inclined plane enters the vein lumen; this blood return is a passive return dependent on venous pressure. However, there are several factors that make it impossible to have visible blood return even if the needle hole of the bevel enters the lumen of the vein, for example, when the venous pressure is very low, shock patients with insufficient circulating blood volume are common, and therefore the passive blood return mode which depends on the venous pressure is extremely insensitive; if the needle hole is close to the inclined plane of the venous valve, the unidirectional flow control function of the venous valve can make the blood difficult to flow into the needle tube; for example, the inclined plane of the needle hole is tightly attached to the vein wall, so that blood can not enter the needle tube; also as the bevel of the needle hole is located at the vein curve; when such a condition of no blood return is present, the operator usually thinks that the needle hole has not entered the vein lumen, and further advances the needle tube, so that the tip of the needle tube which has entered the vein lumen from one side of the vein wall is easily penetrated from the opposite side of the vein wall, i.e. the vein is penetrated by the needle tube, resulting in vein puncture failure, which seriously affects the infusion of drugs and liquids, especially the first aid drugs or the blood which can not enter the vein lumen at the first time can lead to rapid death or irreversible organ failure of the patient.

However, even if blood returns during puncture, the needle tube is continuously pushed into the vein for a certain distance to ensure that the needle hole of the inclined plane completely and sufficiently enters the vein lumen, when the vein trend cannot be judged by naked eyes, the needle tube pushing of the step is completely carried out in a blind state, when the advancing direction of the tip of the needle tube is slightly different from the vein trend, the vein is easily penetrated, puncture is failed, and particularly, safe needle insertion is nearly luxurious when the vein trend of a patient is invisible and the vein lumen is small; in order to avoid the risk of puncturing the vein in the process of continuing needle insertion, some operation methods are that after blood return is seen, the needle tube is retracted by different distances of 1mm-4mm, then the cannula is sent into the vein lumen, although a certain effect is achieved, the retraction easily enables the tip of the needle tube to be separated from the vein lumen, so that puncture failure is caused, and the inner diameter of most target veins is only about 2 mm.

Furthermore, in most clinical operations, the horizontal blade-shaped handle connected with the indwelling needle tube seat is held by hands, the index finger below the needle tube seat inevitably contacts the skin close to the puncture point after being sterilized with the upper index finger and the lower index finger, and the puncture point is easily polluted to cause the related blood flow infection (CRBSI) of the pipeline when microorganisms exist on the index finger (a large number of clinical literatures report); and the index finger between the skin and the needle tube seat can influence the needle inserting angle during operation, namely the selection of the angle between the needle tube and the skin, namely the selection of the optimal angle between the needle tube and the vertical projection line of the needle tube on the skin can be interfered by the index finger clamped between the needle tube and the skin, and the puncture success rate is finally reduced particularly when the smaller optimal needle inserting angle is selected.

In summary, the existing indwelling needles for clinical use have the following serious safety problems:

1. when blood returns, the sharp point of the needle tube of the indwelling needle penetrates the vein during the continuous needle inserting process, so that puncture is failed.

2. The venous pressure dependent passive blood return pattern makes it difficult to see the return blood when the patient's venous pressure is low or otherwise relevant, and the needle tip, which had entered the lumen of the vein, continues to advance through the vein wall resulting in a puncture failure.

3. Because the index finger below the needle tube seat inevitably contacts the skin adjacent to the puncture point after being sterilized, the index finger is easy to pollute the puncture point to cause blood stream infection (CRBSI) related to the pipeline when microorganisms exist on the index finger.

4. The index finger below the needle tube seat can influence the selection of the needle inserting angle, namely the angle between the needle tube and the skin, thereby reducing the puncture success rate.

5. The method for clamping the needle handle by two fingers has poor stability, and is difficult to meet the individual requirements of nurses for operation.

Disclosure of Invention

In order to solve the problems, the invention provides a safe type venous indwelling needle.

The purpose of the invention is realized as follows:

a safety type venous indwelling needle comprising: a rigid needle cannula for piercing the skin and the vein wall, a needle cannula holder holding the bottom end portion of the needle cannula therein; the flexible sleeve is connected with the bottom end of the sleeve in a sealing way, the sleeve seat is provided with a hollow side branch connected with a transfusion hose, and an elastic isolating plug positioned in the extension part of the tubular sleeve seat divides the inner cavity of the sleeve seat into a front cavity and a rear cavity; the front end surface of the isolating plug forms the bottom of a front cavity, the rear end surface of the isolating plug forms the top of a rear cavity, the front cavity is a transfusion cavity, and liquid medicine flowing in the inner cavity of the transfusion hose enters the front cavity of the inner cavity of the cannula seat through a side branch and then enters the vein inner cavity from the opening at the top end of the cannula through the inner cavity of the cannula in normal use; the front end part of the needle tube passes through the isolating plug and is positioned in the cavity of the sleeve; the front end part of the needle tube is the needle tube positioned in the front cavity of the inner cavity of the sleeve and the inner cavity of the sleeve seat; the needle tube seat and the sleeve seat are mutually sleeved, the mutual sleeving refers to the sleeving between the cylindrical sleeve seat extension part and the cylindrical needle tube seat main body, the sleeve seat extension part is sleeved in the inner cavity of the needle tube seat, the needle tube seat is sleeved in the sleeve seat extension part, the sleeved parts can mutually guide and axially slide relatively, and the axial shaft refers to the central axes of the needle tube and the sleeve; at least one elastic component which can deform under the action of external force and comprises a selectable compression spring is arranged between the needle tube seat and the cannula seat; the needle tube seat handle is provided with a contact part which can contact the cannula seat under the driving of external force; the contact member may be an area of the needle hub handle that is accessible to the cannula hub; or a movable part extending from the handle of the needle cannula holder and being deformable by an external force, such as a flap-like extension from the handle of the needle cannula holder, wherein at least one part of the contact part is in contact with a part of the area of the cannula holder.

When the needle tube is used, an operator fixes the needle tube seat by one hand and acts on the sleeve seat by the other hand to drive the sleeve seat to axially move towards the direction close to the needle tube seat, the axial shaft refers to the central axes of the needle tube and the sleeve, and forces the elastic component between the needle tube and the sleeve to deform and store elastic potential energy, and the tip of the needle tube is exposed out of the top end of the sleeve wrapped on the tip of the needle tube; the operator's finger presses the contact member of the needle hub handle in the region of the cannula hub against the cannula hub, e.g., against its surface or into a groove or the like formed therein, to fix the relative position of the two, and the resilient member is not restored. The operator presses the fingers of the contact component and simultaneously presses the transfusion hose near the handle of the needle tube seat to deform the dents. The vicinity can be hung on the side surface of the needle tube seat handle, can be spanned on the upper end of the needle tube seat handle, and can also pass through or penetrate through the surface of the needle tube seat handle.

Then starting the venipuncture process, when the operator judges that the tip of the needle tube possibly enters the vein lumen though blood return is not seen in the venipuncture process, for example when the operator experiences a breakthrough through one side of the vein wall and venous blood pressure is insufficient, in order to accurately judge whether the needle hole at the tip of the needle tube enters the vein lumen, an operator only needs to slightly reduce the pressing force of fingers on the handle of the needle tube seat, at the moment, the shape of the transfusion hose in a pressed area is partially or completely restored to the transfusion hose in a recovery state from a depression state due to the elasticity of the transfusion hose (the transfusion hose is usually made of elastic materials such as TPE, TPU, PVC and the like), no matter the part of the transfusion hose is recovered or the whole transfusion hose is completely recovered, the negative pressure attraction force generated by the partial recovery or the complete recovery actively attracts blood to the lumen of the needle tube, the blood returns through the defective blood return observation hole on the needle tube and is observed by human eyes in time through the transparent or semitransparent sleeve; the blood returning mode is obviously active blood returning and is extremely sensitive, and blood returning can be observed as long as the needle hole part enters the vein lumen, so the blood returning mode is active sensitive blood returning.

When the sharp end of the needle tube enters the vein cavity, the pressing force of fingers on the handle of the needle tube seat is reduced or relieved, so that the sleeve seat is forced to move in the direction away from the needle tube seat due to the elastic restoring force generated by the release of the elastic potential energy of the elastic component, and finally the sharp end of the needle tube is coated on the top end of the soft sleeve, namely the sharp end of the needle tube is not exposed out of the opening of the top end of the sleeve tube; the elastic restoring force of the elastic component after deformation is larger than the resistance of the elastic isolating plug in the inner cavity of the cannula seat to the needle tube part penetrating through the elastic isolating plug, and the resistance refers to the frictional resistance between the isolating plug and the outer surface of the needle tube formed in the drawing-off process due to the pressing force of the elastic isolating plug to the needle tube part penetrating through the elastic isolating plug.

For better control, the needle tube seat main body is cylindrical, a sleeve tube seat extension part which has smaller outer diameter and is also cylindrical is sleeved in the needle tube seat main body, and the needle tube seat main body is connected with a needle tube seat handle; the handle of the needle tube seat comprises two blade-shaped parts which extend out from the upper end surface of a needle tube seat main body and are convenient for fingers to hold, wherein the vertical parts are vertical parts, namely, the needle tube of the indwelling needle is placed in parallel above a horizontal plane, when the inclined plane at the tip end of the needle tube is upward, the parts which are convenient for the fingers to hold by the handle of the needle tube seat are vertical or approximately vertical to the horizontal plane in the use state of starting puncture, namely, the vertical parts are vertical or approximately vertical to the horizontal plane, and the handle of the needle tube seat of the indwelling needle which is clinically used at present is parallel to the horizontal plane; wherein, the handle of at least one vertical needle tube seat is connected with the needle tube seat main body in a movable axial linear shape with two radial gaps, the arc-shaped needle tube seat part between the two radial gaps is the arc-shaped part of the handle of the vertical needle tube seat, and the arc-shaped part is connected with the vertical part on the upper end surface of the needle tube seat main body; the inner side of the arc-shaped part of the handle of the vertical needle tube seat is provided with a contact part which can contact the extension part of the cannula seat under the driving of external force, and the contact part specifically comprises a local bulge on the inner side of the arc-shaped part. When the device is used, two fingers relatively press the handles of the two vertical needle tube seats, the arc-shaped parts are connected in a linear shape to rotate towards the extension part of the cannula seat or directly deform under pressure until the local bulges at the inner sides of the arc-shaped parts contact and press the surface of the extension part of the cannula seat, so that the two parts cannot move axially relatively.

Further increases maneuverability, and includes a blade-like lateral extension attached to the forward end of the vertical portion of the vertical hub handle. The contact of the lateral extension part with the finger can prevent the backward movement of the needle seat caused by the elastic restoring force generated by the release of the elastic potential energy of the elastic part by the finger, and the backward movement refers to the direction opposite to the movement of the cannula seat.

Still further, still include the lateral extension portion of the blade form that links to each other with the vertical portion front end of vertical type syringe seat handle and the back kink that links to each other with the lateral extension portion. The arrangement of the backward bending part enables the tail ends of two fingers of an operator to be respectively clamped between the vertical part of the corresponding needle tube seat handle and the backward bending part, the finger-clamping type handle structure not only further improves the control stability, but also enables the fingers to actively release the constraint force of the contact part of the needle tube seat handle on the extension part of the cannula seat by pushing the backward bending part, thereby releasing the elastic potential energy of the elastic part more quickly; the constraint force refers to the capability of the contact part of the needle tube seat handle to prevent the needle tube seat handle and the needle tube seat handle from moving axially relative to each other in a pressing, embedding and other modes.

Preferably, the needle tube further comprises a blade-shaped lateral extension part connected with the front end of the vertical part of the handle of the vertical needle tube seat, a backward bending part connected with the lateral extension part, and a horizontal extension part; the horizontal extending part is connected with the vertical part, the lateral extending part and the upper edge of the backward bending part. The arrangement of the horizontal extension part enables the tail ends of two fingers of an operator to be respectively sleeved or wrapped in a cuff-shaped space formed by the vertical part, the lateral extension part, the backward bending part, the horizontal extension part and the arc-shaped part of the corresponding needle tube seat handle, the finger sleeve type handle structure not only can enable the fingers to actively drive the backward bending part to move laterally to remove the constraining force of the contact part of the needle tube seat handle on the extension part of the cannula seat, but also enables the control to be more stable to achieve the ideal effect of finger-handle fusion, namely 'finger-needle integration'.

The human engineering conformal design is that the bottom end part of the needle tube seat is provided with a finger support conformal with the outline of fingers, especially the outer side of a middle finger, the finger support can be an independent part sleeved on the bottom end part of the needle tube seat or a part conformal with the outline of the outer side of the fingers at the bottom end part of the needle tube seat, and the conformal part is a sheet-shaped extension part which is convenient to abut against the outer side of the fingers and has a C-shaped section and slightly inclines towards the upper right.

One design is that the rear ends of the vertical parts of the handles of the two vertical needle tube seats are connected into a whole.

The other design is that the upper ends of the vertical parts of the two vertical needle tube seat handles are connected into a whole, and at least one side of the two vertical needle tube seat handles is provided with a U-shaped gap with three open sides, so that a strip-shaped vertical part free arm is formed; the free arm can rotate in the axial direction by the linear connecting part of the free arm and the vertical part, and the inner side of the free end of the free arm is provided with a contact part, in particular a strip-shaped embedded bulge.

In order to better restrict the movement of the cannula seat without intervals, the contact part of the handle of the vertical needle tube seat is provided with at least one linear convex rib at the inner side of the arc part; at least one arc-shaped recess which can be embedded with the casing seat extension part is arranged on the surface of the casing seat extension part at the position corresponding to the linear convex rib.

A reliable and easy motion design of the restraining cannula base is that the contact part of the handle of the vertical needle tube base is a strip-shaped embedded bulge on the inner side of an arc part; at least one limiting groove including a through groove is arranged on the surface of the extension part of the sleeve seat at the position corresponding to the strip-shaped embedding bulge, and the embedding bulge can be embedded into the limiting groove. When the embedding bulge connected with the needle tube seat is embedded into the limiting groove on the sleeve seat, the relative axial movement of the needle tube seat and the sleeve seat is limited, at the moment, the tip end of the needle tube is exposed out of the opening at the top end of the sleeve tube, the pressing force of fingers on the handle of the needle tube seat is reduced or relieved after the puncture sees blood return to reset the arc-shaped part, the embedding bulge moves out of the limiting groove on the sleeve seat, the elastic potential energy of the elastic component is released to push the sleeve seat to move towards the direction far away from the needle tube seat, and finally the sharp tip end of the needle tube is coated on the top end of the soft.

One design is that the needle tube seat main body is in a cylinder shape, a sleeve seat extension part which has smaller outer diameter and is also in a cylinder shape is sleeved in the needle tube seat main body, and the needle tube seat main body is connected with a needle tube seat handle; the handle comprises a blade-shaped part which extends out of the upper end face of a needle tube seat main body and is convenient for fingers to hold, a vertical part, a strip-shaped vertical part free arm connected with one side of the vertical part, a linear connecting part of the free arm and the vertical part and capable of axially rotating, and a contact part which can be a strip-shaped embedded bulge and is arranged on the inner side of the free end of the free arm; the side part of the needle tube seat corresponding to the free end of the free arm of the needle tube seat main body is provided with a through windowing area, the surface of the extension part of the sleeve seat corresponding to the through windowing area is provided with at least one limiting groove comprising a through groove, and the strip-shaped embedded bulge can be embedded into the limiting groove.

Furthermore, the vertical needle tube seat handle is provided with a lateral extension part, the upper end of the lateral extension part is connected with a blade-shaped forward bending part, and an opening for accommodating the infusion hose is arranged on the forward bending part.

Furthermore, the handle of the vertical needle tube seat is provided with a lateral extending part, the upper end of the lateral extending part is connected with a blade-shaped forward bending part, and the forward bending part is provided with an opening partially accommodating the infusion hose; the upper end of the vertical part is provided with a concave area which is convenient for the transfusion hose to ride longitudinally.

A design suitable for the operation habit of 'horizontal needle holding' of the existing clinical nurse is that a needle tube seat main body is in a cylindrical shape, a sleeve tube seat extension part which has smaller outer diameter and is also in the cylindrical shape is sleeved in the needle tube seat main body, and a needle tube seat handle is connected on the needle tube seat main body; the horizontal needle tube seat handle comprises a blade-shaped horizontal part which extends out of the side surface of a needle tube seat main body and is convenient for fingers to hold, wherein the horizontal part is that an indwelling needle tube is placed in parallel on a horizontal plane, when the inclined plane of the tip of the needle tube is upward, the part of the needle tube seat handle which is convenient for the fingers to hold is parallel or approximately parallel to the horizontal plane, namely the horizontal part is parallel or approximately parallel to the horizontal plane and is similar to the conformation of the currently clinically used indwelling needle; the upper surface of the horizontal part is connected with an arched strip-shaped horizontal part free arm, the free arm can axially rotate by taking a linear connecting part of the free arm and the horizontal part as an inner side, and the inner side of the free end of the free arm is provided with a contact part which specifically comprises a strip-shaped embedded bulge; the part of the needle tube seat body corresponding to the free end of the free arm is provided with a through windowing area, the surface of the extension part of the sleeve seat corresponding to the through windowing area is provided with at least one limiting groove comprising a through groove, and the strip-shaped embedded bulge can be embedded into the limiting groove. When the device is used, two fingers of one hand hold the part of the handle of the fixed horizontal needle tube seat, which is not contacted with the free arm, the other hand pulls the main body of the cannula seat downwards, the elastic part is compressed and deformed, the tip of the needle tube is exposed from the top end of the retreated cannula, and then the fingers press the free arm connected with the upper surface of the handle of the horizontal needle tube seat, the free arm takes the linear connecting part as the axial inner part, namely rotates towards the central axis direction of the needle tube or is directly pressed and deformed to enable the embedding bulge at the free end of the free arm to be embedded into the limiting groove of the extension part of the cannula seat, and the needle tube; after blood returns during puncture, the pressing force of fingers on the handle of the needle tube seat is reduced or relieved to reset the free arm, the embedded protrusion moves out of the limiting groove on the sleeve seat, the elastic potential energy of the elastic component is released to push the sleeve seat to move towards the direction far away from the needle tube seat, and finally the sharp needle tube tip is coated at the top end of the soft sleeve.

Furthermore, the side branch of the cannula seat connected with the infusion hose is positioned at the same side of the handle of the horizontal needle tube seat, and the front end of the blade-shaped horizontal part of the handle of the horizontal needle tube seat is connected with the blade-shaped upward extending part.

And in a further step, the side branch of the cannula base connected with the infusion hose is positioned at the same side of the horizontal needle tube base handle, the front end of the blade-shaped horizontal part of the horizontal needle tube base handle is connected with a blade-shaped upward extending part, and the upper end of the upward extending part is connected with a backward bending part which is horizontally unfolded.

Another scheme for improving the operation and control stability is that the needle tube seat main body is cylindrical, a sleeve seat extension part which has smaller outer diameter and is also cylindrical is sleeved in the needle tube seat main body, and the needle tube seat main body is connected with a needle tube seat handle; the finger ring type needle tube seat handle comprises a curling part which extends upwards and backwards from the upper end of a needle tube seat main body and is in a curling blade shape and convenient for fingers to hold, when in use, a forefinger contacts the inner side of the curling part, a thumb contacts the outer side of the curling part, the curling part is provided with a curling part free arm extending forwards, and the free end of the curling part is provided with a contact part which can specifically comprise a strip-shaped embedding bulge; the upper end part of the needle tube seat main body corresponding to the free end of the free arm is provided with a through windowing area, the surface of the extension part of the sleeve seat corresponding to the through windowing area is provided with a limit groove comprising a through groove, and the strip-shaped embedded bulge can be embedded into the limit groove.

Furthermore, the free end of the free arm of the curling part is provided with a contact part which can specifically comprise a strip-shaped embedding bulge; the free arm is also provided with a branch which is extended to and can touch the upper end of the main body of the cannula seat, the upper end part of the cannula seat corresponding to the branch is provided with a through windowing area which is sealed by a film-shaped elastic body, the inner side surface of the elastic body faces to the front cavity of the cannula seat, namely a transfusion cavity, the tail end of the branch of the free arm can contact and press the outer side surface of the elastic body, so that the elastic body slightly protrudes into the front cavity of the cannula seat, a drop or a plurality of drops of liquid medicine in the front cavity of the cannula seat can be discharged from a needle hole, obvious blood return is not seen when puncture is sensed, the finger can be released to relieve the pressure of the tail end of the branch of the free arm on the elastic body, and the negative pressure attraction force.

As a thought of the invention, the needle tube seat handle is an independent needle tube seat handle formed by independent parts or assemblies and is connected with the needle tube seat into a whole for use; the handle of the independent needle tube seat is an independent part or assembly, and is sleeved or bonded with the needle tube seat into a whole by using a buckle structure.

In order to better indicate the degree of relative movement between the needle tube seat and the cannula seat, the needle tube seat main body is cylindrical, a cylindrical cannula seat extension part with a smaller outer diameter is sleeved in the needle tube seat main body, and a mark for indicating distance including a mark line and a mark point is arranged on the surface of the cannula seat extension part.

In order to better realize active sensitive blood return, the needle tube seat handle of all the schemes is provided with a restriction and guide part of a transfusion hose comprising a selectable hook, a concave part, an opening and a shallow groove. The restricting and guiding part can be an independent part or an assembly, and can also be a structural part of the needle tube seat handle which has the function of restricting and guiding the infusion hose.

The invention has the beneficial effects that:

1. when blood returns, extra operations such as finger replacement are not needed, the sharp tip of the needle tube can be actively covered by the sleeve by keeping the original position of the finger, and the risk of puncture failure caused by the fact that the tip of the needle tube penetrates through the vein in the process of continuing needle insertion is thoroughly eliminated.

2. The active suction type sensitive blood returning mode replaces an insensitive passive blood returning mode of venous pressure dependency, whether a needle hole of the inclined plane at the tip end of the needle tube enters a vein tube cavity or not can be accurately and timely judged, and puncture failure caused by blind needle insertion is avoided.

3. The skin non-contact type needle holding avoids pipeline-related blood flow infection (CRBSI) caused by the fact that microorganisms on the surface of an operator finger pollute a puncture point to the maximum extent.

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

5. Finger clip formula, dactylotheca formula, the multiple scheme of ring formula has promoted control stability, has satisfied the individualized demand of nurse's operation.

Drawings

The drawings, which do not limit the invention, are as follows:

FIG. 1: the puncture operation diagram of the existing clinical venous indwelling needle is shown;

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

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

FIG. 2C: a schematic representation of the sharp tip of the needle cannula in close proximity to the venous valve;

FIG. 2D: the inclined plane and the pinhole of the sharp point of the needle tube are enlarged schematically;

FIG. 2E: the bevel of the sharp tip of the needle tube is tightly attached to the intima of the vein wall;

FIG. 2F: schematic representation of the cannula being located within the lumen of the vein;

FIG. 3A: in the three-dimensional structure schematic diagram of embodiment 1 of the invention, the handles are closed, and the tip of the needle tube is exposed;

FIG. 3B: the three-dimensional structure of embodiment 1 of the invention is schematically shown, the handle is opened, and the tip of the needle tube is covered by the sleeve;

FIG. 3C: the integral cutting structure of the invention in the embodiment 1 is schematically shown, the spring is compressed, and the tip of the needle tube is exposed;

FIG. 3D: the overall cutting structure of the embodiment 1 of the invention is schematically shown, the spring is released, and the tip of the needle tube is covered by the sleeve;

FIG. 3E: the partial cut-away three-dimensional structure of embodiment 1 of the invention is shown schematically;

FIG. 3F: the operating process state of embodiment 1 of the invention is schematically illustrated, the handle is closed, and the tip of the needle tube is exposed;

FIG. 3G: the operation process state of embodiment 1 of the invention is shown schematically, the handle is opened, and the needle tube tip is covered by the sleeve;

FIG. 3H: the operation process of the embodiment 1 of the invention is integrally sectioned as a schematic diagram, and the infusion hose is deformed under pressure;

FIG. 3I: the operation process of the embodiment 1 of the invention is wholly cut away and schematically illustrated, and the shape of the transfusion hose is recovered;

FIG. 3J: the operating process state of embodiment 1 of the invention is schematically illustrated, the cannula holder and the needle tube holder are separated;

FIG. 3K: the invention embodiment 1 is a schematic diagram of an optimized scheme three-dimensional structure;

FIG. 4A: the three-dimensional structure of embodiment 2 of the invention is shown schematically;

FIG. 4B: the operation process state diagram of embodiment 2 of the invention;

FIG. 5A: a schematic perspective structure diagram of embodiment 3 of the present invention;

FIG. 5B: the partial cutting-off three-dimensional decomposition structure schematic diagram of the embodiment 3 of the invention;

FIG. 6A: the three-dimensional structure of embodiment 4 of the invention is shown schematically;

FIG. 6B: the partial cutting three-dimensional structure of embodiment 4 of the invention is shown schematically;

FIG. 6C: the scheme of the independent handle of the embodiment 4 of the invention has a three-dimensional decomposition structure schematic diagram;

FIG. 7: the three-dimensional structure of embodiment 5 of the invention is schematically shown;

FIG. 8: the three-dimensional structure of embodiment 6 of the invention is schematically shown;

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

FIG. 9B: an operational process state diagram of embodiment 7 of the present invention;

FIG. 10A: the three-dimensional structure of embodiment 8 of the invention is schematically shown;

FIG. 10B: an operation process state diagram of embodiment 8 of the present invention;

FIG. 11A: a schematic perspective structure diagram of embodiment 9 of the present invention;

FIG. 11B: an operation process state diagram of embodiment 9 of the present invention;

FIG. 12A: a schematic perspective structure diagram of embodiment 10 of the present invention;

FIG. 12B: an operation process state diagram of embodiment 10 of the present invention;

FIG. 13A: a schematic perspective structure diagram of embodiment 11 of the present invention;

FIG. 13B: an operation process state diagram of embodiment 11 of the present invention;

FIG. 13C: the partial cutting structure of the embodiment 11 of the invention is shown schematically;

FIG. 13D: the partial cutting structure of the embodiment 11 of the invention is schematically shown, the spring is compressed, the tip of the needle tube is exposed, and the infusion hose is deformed under pressure;

FIG. 13E: the partial cutting structure of the embodiment 11 of the invention is schematically shown, the spring is compressed, the tip of the needle tube is exposed, and the shape of the transfusion hose is restored;

FIG. 13F: the partial sectioning structure of the embodiment 11 of the invention is schematically shown, the spring is released, and the tip of the needle tube is coated by the sleeve;

FIG. 14A: a schematic perspective structure diagram of embodiment 12 of the present invention;

FIG. 14B: an operational process state diagram of embodiment 12 of the present invention;

FIG. 14C: the partial cutting structure of the embodiment 12 of the invention is schematically shown, the spring is compressed, and the tip of the needle tube is exposed;

FIG. 14D: the partial cutting structure of the embodiment 12 of the invention is schematically shown, the spring is compressed, the tip of the needle tube is exposed, and the diaphragm-shaped elastomer is deformed under pressure;

FIG. 14E: the partial cutting structure of the embodiment 12 of the invention is schematically shown, the spring is released, and the needle tube tip is covered by the sleeve.

In the figure: s. a skin surface; s1, subcutaneous tissue; s0. skin disinfection areas; t. thumb; F. the index finger; m, middle finger; v. veins; v0. vein lumen; v1, a lateral vein wall; v2. contralateral vein wall; vv. venous valves; w1, a blood return observation hole on the needle tube; w2, a windowing area on the side surface of the needle tube seat; w3. window opening area in the middle of needle tube seat; w4. window opening area on the upper end surface of needle tube seat; w5. a fenestration area at the upper end of the cannula holder; p. the inclined plane of the tip of the needle tube; l1, the central axis (reference axis) of the needle tube and the sleeve; l2, a vertical projection line of the reference shaft of the needle tube on the skin; J1. stopping water; J2. an indwelling needle hub; G1. a radial slit on the needle tube seat; G2. a U-shaped gap on the needle tube seat; E. an elastomer in the form of a membrane; E1. an elastomeric inner side; E2. an elastomer outer side surface; 1. a venous indwelling needle; 11. a needle tube; 110 needle lumen; 111. a needle tube tip; 112. a pinhole; 113. the front end part of the needle tube; 114. a needle tube bottom end portion; 115. a needle portion within the septum; 12. a needle tube base; 120. the needle tube seat inner cavity; 121. the top end part of the needle tube seat; 122. the upper end surface of the needle tube seat; 123. the lower end part of the needle tube seat; 124. the side surface of the needle tube seat; 125. the bottom end part of the needle tube seat; 1251. the bottom end surface of the needle tube seat; 1252. the bottom end of the needle tube seat is supported by a finger; 126. the section of the middle part of the needle tube seat is an arc-shaped connecting part extending longitudinally; 13. a flexible infusion tube; 130. the inner cavity of the transfusion hose; 131. a depressed infusion hose; 132. a transfusion hose returning from a depressed state; 14. a sleeve; 140. a cannula lumen; 141. the top end of the sleeve; 142. the bottom end of the sleeve; 143. an inner surface of the sleeve; 144. the top end of the sleeve is opened; 15. a cannula holder; 150. the inner cavity of the sleeve seat is 150a, the front cavity; 150b. a rear chamber; 151. a cannula housing body; 152. the top end of the sleeve seat; 153. the upper end of the sleeve seat; 154. the side surface of the sleeve seat; 155. a cannula holder side branch; 156. a cannula mount extension; 1561. a limiting groove; 1562. an arc-shaped recess; 1563. the bottom end surface of the extension part of the sleeve seat; 1564. marking; 16. a needle tube seat handle; a vertical needle hub handle; 16a1. left vertical needle holder handle; 16a2. right vertical needle holder handle; 16b. a vertical needle hub handle; 16c, a horizontal needle tube seat handle; 16d, a ring-shaped needle tube seat handle; a free-standing needle hub handle; 161. the front end of the needle tube seat handle; 162. the back end of the needle tube seat handle; 163. the needle tube seat handle is connected with the line of the main body; 164. the needle tube seat handle arc part; 1641. a semicircular connecting portion; 1642. a longitudinal rib of the arc-shaped part; 165. a needle tube base handle vertical part; 1650. an interior space of the two vertical portions; 1651. hooking; 1652. a vertical portion free arm; 1653. a linear connection of the free arm 1652 to the vertical portion; 1654. a recessed area at the upper end of the vertical part; 1655. a finger rest at the rear end of the vertical part handle; 166. the needle tube seat handle extends laterally; 1661. a backward bending part; 1662. a horizontal extension; 1663. a forward bend; 1664. an opening on the forward bend; 1665 opening at the lower end of the lateral extension; 167. a horizontal part of the needle tube seat handle; 1671. the bottom end of the horizontal part is folded upwards; 1672. the shallow groove is favorable for fixing the transfusion hose; 1673. a horizontal portion free arm; 1674. a linear connection of the free arm 1673 to the horizontal portion; an upward extension 168; 1681. a backward bending part; 169. a curling part of the needle tube seat handle; 1691. the inside of the curled part; 1692. the outside of the curled part; 1693. a curl release arm; 1694. the branch of free arm 1693; 1695. the end of the branch; 17. a contact member of the needle cannula holder handle; a local bulge inside the arc part; 17b, embedding bulges at the inner sides of the arc parts; 17c, a convex rib at the inner side of the arc part; an inlay protrusion inside the free end of the free arm 1652; inlay protrusion inside free end of free arm 1673; inlay protrusion of free end of free arm 1693; 18. an elastic member; 18a compression spring; 19. an elastic isolating plug; 191. the front end surface of the isolating plug; 192. the rear end face of the isolating plug.

Detailed Description

Examples, which do not limit the invention, are as follows:

first, describing the operation process of the existing vein indwelling needle, as shown in fig. 1, the indwelling needle joint J2 is connected to the tube of the medical fluid container, the medical fluid flows into the infusion tube 13, the air is removed to make the medical fluid drip out of the needle hole 112 of the indwelling needle, the water stop J1 clamped on the infusion tube 13 is closed, after the skin S0 near the puncture point is sterilized, the left hand tightens the skin, the right hand thumb T holds the needle holder handle 16 under the upper index finger F, the needle tip bevel P is upward, the opaque needle tube 11 is inserted at an angle α with the skin surface S, the angle α is the angle between the central axis L1 (i.e. needle tube) of the needle tube 11 and the vertical projection line L2 of the needle tube 11 central axis L1 on the skin surface S, the correct selection of the needle insertion angle α determines whether the needle insertion is successful or not, however, the index finger F located between the needle holder handle 16 and the skin surface S is liable to contaminate the sterilized skin S0 and seriously disturb the selection of the needle tube 112 when the needle tube 112 is not inserted into the needle tube 112, especially when the needle tube 111 is selected to be a small, and the needle tube is inserted into the needle tube 112, and the needle tube 112 is inserted into the needle tube 112, the needle tube 112 is not inserted into the needle tube 112, the needle tube 112 is inserted into the needle tube 112, the needle tube 112 is difficult to be inserted into the needle tube 112, the needle tube 111 is difficult to be inserted into the needle tube 112, the needle tube is difficult to be inserted into the needle tube, the needle tube is difficult to be inserted into the needle tube, the needle tube is difficult to be inserted into the needle tube, the needle tube is difficult to be inserted into the needle tube, the needle tube is difficult to be inserted into the needle tube, the needle tube is difficult to be.

Example 1:

as shown in the beginning series of fig. 3A, 3B, etc., embodiment 1 of the present invention comprises: a rigid needle cannula 11 for piercing the skin and vein wall, a needle cannula holder 12 having a needle cannula base end portion 114 secured therein; a flexible cannula 14, a cannula holder 15 sealingly connected to the cannula base end 142, the cannula holder 15 having a main body portion 151, a cannula holder upper end 153, cannula holder sides 154, the cannula holder upper end 152 sealingly connected to the cannula base end 142, the cannula holder main body 151 having a hollow side branch 155 on the left side for connection to the infusion hose 13, the side branch 155 on the cannula holder main body 151 being followed by a cylindrical extension 156, as shown in fig. 3C, 3D; the needle hub 12 has a top end 121 located behind the side legs 155 of the hub body 151 of the needle hub 12, and also has a top end 122, a bottom end 123, sides 124, a bottom end 125, and a bottom end 1251; an elastomeric septum 19 within the cylindrical cannula hub extension 156 divides the cannula hub interior cavity 150 into a front cavity 150a and a rear cavity 150 b; the isolation plug 19 made of elastic material can be sealed again after the needle tube 11 is drawn away, the front end face 191 of the isolation plug 19 forms the bottom of the front cavity 150a, the rear end face 192 of the isolation plug forms the top of the rear cavity 150b, the front cavity 150a is an infusion cavity, during normal use, the liquid medicine flowing in the inner cavity 130 of the infusion hose enters the front cavity 150a of the inner cavity 150 of the cannula base through the side branch 155 and then enters the venous cavity V0 from the opening 144 at the top end of the cannula through the inner cavity 140 of the cannula (as shown in FIG. 2F); the front end part 113 of the needle tube 11 passes through the isolating plug 19 and is positioned in the cannula cavity 140; the front end part 113 of the needle tube 11 is a needle tube positioned in the cannula cavity 140 and the front cavity 150a of the cannula holder cavity 150; cannula tip 141 covers sharp needle cannula tip 111; i.e., the sharp needle cannula tip 111 is not exposed from the cannula tip opening 144.

At least one elastic component 18 including a selectable compression spring 18a which can deform under the action of external force is arranged between the needle tube seat 12 and the cannula seat 15 which are sleeved with each other, wherein the sleeved connection refers to the sleeved connection between the cylindrical cannula seat extension part 156 and the cylindrical needle tube seat 12 main body, the cannula seat extension part 156 can be sleeved in the needle tube seat inner cavity 120, or the cannula seat 12 can be sleeved in the cannula seat extension part 156, the sleeved parts can mutually guide and slide in the relative axial direction, and the axial axis refers to the central axis L1 of the needle tube 11 and the cannula 14.

The elastic component 18 in this embodiment is a compression spring 18a, the bottom end of the compression spring 18a abuts against the bottom end of the cavity 120 of the needle tube holder 12, and the top end of the compression spring 18a abuts against the bottom end surface 1563 of the extension part 156 of the casing holder; alternatively, the tip of the compression spring 18a may abut against the rear end surface 192 of the elastic stopper 19.

The main body of the needle tube seat 12 in this embodiment is cylindrical, and a sleeve seat extension part 156 which has a smaller outer diameter and is also cylindrical is sleeved in the main body, and the main body of the needle tube seat 12 is connected with a needle tube seat handle 16; the vertical needle tube seat handle 16a comprises two blade-shaped parts which extend out from the upper end surface 122 of the needle tube seat 12 body and are convenient for fingers to hold, namely, a vertical part 165, wherein the vertical part refers to that the part which is convenient for fingers to hold by the needle tube seat handle 16 is vertical or approximately vertical to the horizontal plane in the use state of starting puncture when the indwelling needle tube 11 is placed on the horizontal plane in parallel or the skin surface of a puncture point is taken as the horizontal plane, and the inclined plane P of the needle tube tip 111 faces upwards, namely, the vertical part 165 is vertical or approximately vertical to the horizontal plane, and the indwelling needle tube seat handle which is clinically used at present is parallel to the horizontal plane under the condition; wherein the right vertical needle holder handle 16a2 is fixedly connected with the needle holder 12 as a whole, the left vertical needle holder handle 16a1 and the needle holder 12 are movably and axially connected 163 with two radial gaps G1, the arc-shaped needle holder 12 between the two radial gaps G1 is the arc-shaped part 164 of the vertical needle holder handle 16a, the arc-shaped part 164 is connected with the vertical part 165 on the upper end surface 122 of the needle holder 12, the right vertical needle holder handle 16a2 of the embodiment is not provided with the arc-shaped part 164; inside the arcuate portion 164 of the vertical hub handle 16a1 is a contact member 17 that is urged by an external force to contact the cannula hub extension 156, and may specifically include a localized protrusion 17a inside the arcuate portion 164, as shown in FIG. 3E.

As shown in fig. 3A and 3F, in use, the operator firstly fixes the needle holder 12 with one hand, and applies one hand to the cannula holder 15 to drive it to move axially toward the needle holder 12, wherein the axial axis is the central axis L1 of the needle tube 11 and the cannula 14, and the compression spring 18a between the two is forced to generate compression deformation to store elastic potential energy, and the needle tip 111 is exposed from the cannula tip 141 covering the needle tip; simultaneously, the transfusion hose 13 extending from the side branch 155 of the needle tube seat is clamped into a hook 1651 with an upward opening at the bottom end of the outer side surface of the vertical part 165 of the needle tube seat handle 16a1, so that the transfusion hose is hung on the outer side surface of the vertical part 165 of the needle tube seat handle 16a 1; then two fingers press the two vertical needle holder handles 16a1, 16a2 relatively to make them involutory, the arc part 164 rotates to approach or directly press and deform the cannula holder extension 156 by using the linear connection 163 as a rotating axial direction until the local bulge 17a at the inner side of the arc part 164 contacts and presses the surface of the cannula holder extension 156, so that the two can not move relatively to the axial direction, the thumb T of the operator presses the vertical needle holder handle 16a1 and the infusion hose 13 hung thereon, at this time, the infusion hose 13 is the infusion hose 131 deformed inwards by the pressure lumen 130, namely, the infusion hose 131 is depressed, as shown in fig. 3H.

When the operator determines that the needle tube tip 111 may enter the venous lumen V0 even though blood returns are not seen during venipuncture, for example, when the operator experiences a breakthrough feeling of puncturing the venous wall V1 and the pressure of the venous V blood is insufficient, in order to accurately determine whether the needle hole 112 of the needle tube tip 111 enters the venous lumen V0, the operator only needs to slightly reduce the pressing force of the thumb T on the vertical needle tube base handle 16a1, at this time, due to the elasticity of the infusion tube 13 (the infusion tube is usually made of elastic materials such as TPE, TPU, PVC, etc.), the shape of the infusion tube 131 in the pressed area partially or completely recovers from the depressed state to the infusion tube 132 in the recovered state, as shown in fig. 3I, the negative pressure suction force generated by the partial or complete recovery actively sucks blood to the needle tube lumen 110, and flows through the blood return observation hole W1 in the upper portion of the needle tube, the return blood is observed by the human eye in time through the transparent or translucent sleeve 14; this blood return is clearly an active blood return and is extremely sensitive, so that blood return is observed as soon as the needle 112 partially enters the venous lumen V0, thus being an "active sensitive blood return".

After the blood returns, the clamping force of the fingers on the handles 16a1 and 16a2 of the two vertical needle tube seats is further released, and simultaneously, the middle finger M is propped against the bottom end face 1251 of the needle tube seat, as shown in figure 3G; the needle hub handle 16a1 is restored by the restoring force of the linear connection 163 of the curved portion 164, the local protrusion 17a inside the curved portion 164 releases the pressure on the surface of the cannula hub extension 156, the elastic potential energy of the compression spring 18a is released, and the cannula hub is pushed to move forward axially to make the cannula tip 141 cover the needle tip 111, as shown in FIG. 3D.

After the needle tip 111 is covered by the relatively flexible cannula tip 141, the two vertical needle holder handles 16a1, 16a2 are clamped by fingers, the needle is continuously inserted for several millimeters to a proper extent, one hand presses the cannula holder main body 151 and the other hand withdraws the needle holder 12, finally the two are separated as shown in the state of fig. 3J, the puncture is successfully completed, only the flexible cannula 14 is left in the vein lumen V0, and the elastic isolating plug 19 automatically seals the channel for accommodating the needle 11 from the outside fluid after the needle 11 is withdrawn due to the self elastic restoring force.

In the present invention, the elastic restoring force of the elastic member 18 including the compression spring 18a after deformation is larger than the resistance of the elastic septum 19 of the cannula holder cavity 150 to the needle portion 115 passing therethrough, which is the frictional resistance between the septum 19 and the outer surface of the needle cannula 11 during the withdrawal process due to the pressing force of the elastic septum 19 to the needle portion 115 passing therethrough.

As a preferred structure of this embodiment, FIG. 3K shows a finger rest 1252, specifically, the needle hub bottom end portion 125 is provided with a finger rest 1252 conforming to the contour of the outer side of a finger, especially the middle finger, the finger rest 1252 may be a separate component sleeved on the needle hub bottom end portion 125, or may be a portion of the needle hub bottom end portion 125 conforming to the contour of the outer side of the finger, the conforming portion is a sheet-like extension portion with a C-shaped cross section for abutting against the outer side of the finger and slightly inclined to the upper right; the finger rest 1252 is provided to better resist the backward movement of the needle holder 12 due to the elastic force, i.e., the movement in the direction away from the tip 111 of the needle tube when the elastic force of the elastic member 18 is released; the method for pressing the middle finger M against the bottom end face 1251 of the needle tube seat with the round blunt shape shown in figure 3F is improved, so that the operator can feel more comfortable.

Example 2:

as shown in fig. 4A and 4B, unlike the embodiment 2, it further comprises a blade-shaped lateral extension 166 connected to the front end 161 of the vertical portion 165 of the vertical hub handle 16 a; contact of the lateral extension 166 with a finger may enable the finger to resist rearward movement of the needle hub 12 when the resilient restoring force generated by the release of the resilient potential energy of the resilient member 18 is applied, which is also in a direction opposite to the movement of the cannula hub 15; specifically, the two vertical needle holder handles 16a1, 16a2 are connected with a lateral extension 166, the thumb T and the index finger F are abutted against the inner side of the lateral extension 166, and the lateral extension 166 can effectively prevent the needle holder 12 from moving backwards; the function of the finger rest 1252 can be replaced under this design.

Example 3:

as shown in fig. 5A and 5B, the solution of embodiment 2 is different from that of embodiment 2 in that it further comprises a blade-shaped lateral extension 166 connected to the front end 161 of the vertical portion 165 of the vertical hub handle 16a and a rearward bend 1661 connected to the lateral extension 166. The provision of the rearward bend 1661 allows the two finger tips of the operator to be clamped between the corresponding vertical portion 165 of the hub handle and the rearward bend 1661, which not only further improves the handling stability but also allows the fingers to release the elastic potential energy of the elastic member 18 more quickly by pushing the rearward bend 1661 to actively release the restraining force of the contact member 17 of the hub handle 16 on the cannula hub extension 156.

The partially cut-away exploded perspective view of FIG. 5B shows the opening 1665 at the lower end of the lateral extension 166, the opening 1665 to the left to receive the infusion hose 13 and to suspend a portion of the infusion hose 13 on the outside of the left vertical hub handle 16a1 in conjunction with the free-end-up hook 1651.

As shown in FIG. 5B, the inner side of the arc-shaped portion 164 is provided with a block-shaped embedding protrusion 17B, and the corresponding extension 156 of the cannula holder is provided with a corresponding limiting groove 1561, wherein the limiting groove 1561 may be a downward transverse or longitudinal depression of the surface of the extension 156 or a through groove penetrating to the rear cavity 150B of the cannula holder, and the corresponding position is that the protrusion 17B can be pressed into the limiting groove 1561 when the compression spring 18a is compressed to expose the tip 111 of the needle tube from the top 141 of the cannula for puncture.

As shown in fig. 5B, a mark 1564 indicating a distance including a mark line and a mark point is provided on the surface of the cannula holder extension 156, and the mark 1564 may be a printed line, a local transverse rib or a groove, or one or more than one; when a flag is set, the presence of the flag 1564 in operation may indicate that the cannula tip 141 has covered the needle cannula tip 111; when multiple markers are provided, the presence of different position markers 1564 in the operation may indicate a particular distance of the cannula tip opening 144 from the needle tip 111, which may indicate whether the needle cannula 11 may be withdrawn.

Example 4:

as shown in fig. 6A, 6B, 6C, unlike the solution of embodiment 3, not only includes a blade-like lateral extension portion 166 connected to the front end 161 of the vertical portion 165 of the vertical hub handle 16A and a rearward bent portion 1661 connected to the lateral extension portion 166, but also a horizontal extension portion 1662; in connection with the upper edges of the vertical portion 165, the lateral extending portion 166, and the rear bending portion 1661, horizontal extending portions 1662 are provided on both left and right sides of the present embodiment.

The horizontal extension 1662 is configured to allow the two fingers of the operator to be respectively sleeved or wrapped in the corresponding cuff-like space formed by the vertical portion 165, the lateral extension 166, the backward bending portion 1661, the horizontal extension 1662 and the arc portion 164 of the needle hub handle, as shown in fig. 6A, such a fingerstall type handle structure not only allows the fingers to actively drive the backward bending portion 1661 to move laterally to release the constraining force of the contact part 17 of the needle hub handle 16 on the cannula hub extension 156, but also allows the manipulation to be more stable, thereby achieving the ideal effect of finger-handle fusion, i.e. finger-needle combination.

Unlike the embodiment 3 in which the projection 17B is fitted into the stopper groove 1561, as shown in fig. 6B, a plurality of radially-expanded and axially-arranged arc-shaped recesses 1562 are provided on the surface of the extension portion 156 of the ferrule holder, and a rib 17c which can be pressed into the arc-shaped recesses 1562 is provided inside the arc-shaped portion 164, so that the compression spring 18a is finally prevented from restoring its shape by the pressure of the rib 17c on the arc-shaped recesses 1562.

Alternatively, as shown in FIG. 6C, the needle hub handle 16 is a separate type needle hub handle 16e formed as a separate component or assembly and is used integrally with the needle hub 12. The handle 16e of the independent needle tube seat is an independent part or assembly, and is sleeved or bonded with the needle tube seat 12 into a whole including a buckle structure, compared with the needle tube seat main body, the handle is integrally molded and processed, two materials with different properties are easy to adopt, certain special clinical requirements are easier to meet, certain specifications are easier to produce in batches, and certain specifications are relatively simple to assemble.

The separate vertical hub handle 16e shown in fig. 6C is formed by connecting the curved portions 164 of the two handles together by a bottom semicircular connecting portion 1641, and by engaging a longitudinal rib 1642 formed on the inner surface of the curved portion 164 into the connecting portion 126 of the central fenestrated area W3 of the hub 12, which has an arc-shaped cross section and extends longitudinally, and finally is connected to the hub 12.

Example 5:

as shown in fig. 7, the most different from the above embodiment is that the rear ends 162 of the vertical portions 165 of the two vertical needle holder handles 16a1 and 16a2 are integrally connected, so that the interference of the relative movement of the two vertical needle holder handles 16a1 and 16a2 with the operation is minimized, and the operation is more stable.

Example 6:

as shown in FIG. 8, the greatest difference from the previous embodiment is that the upper ends of the vertical portions 165 of the two vertical hub handles 16a1, 16a2 are integrally connected, the interior 1650 receives the cannula hub extension 156, and the cannula hub 12 is provided with a three-sided open U-shaped slit G2 in at least one side to form a strip-shaped vertical portion wandering arm 1652; the free arm 1652 is axially rotatable about a linear connecting portion 1653 between the free arm 1652 and the vertical portion 165, and a contact member 17, specifically a block-shaped embedding protrusion 17d, is provided on the inner side of the free end of the free arm 1652; at least one limiting groove 1561 (not shown) is provided at a corresponding position on the casing seat extension 156 that is sleeved therein.

Example 7:

as shown in fig. 9A and 9B, the needle tube holder 12 is cylindrical, and a sleeve holder extension 156 having a smaller outer diameter and also having a cylindrical shape is fitted therein, and the needle tube holder handle 16 is connected to the needle tube holder 12; the biggest difference between this scheme is that the needle hub handle 16 is embodied as a vertical needle hub handle 16b, which includes a blade-shaped vertical portion 165 protruding from the upper end surface 122 of the needle hub 12 for finger holding, a strip-shaped vertical portion release arm 1652 is connected to one side (left side in the figure) of the vertical portion 165, the release arm 1652 can rotate in the axial direction of a linear connecting portion 1653 of the release arm 1652 and the vertical portion 165, and a contact member 17, embodied as a strip-shaped embedding projection 17d, is provided inside the free end of the release arm 1652; the needle hub side 124 of the needle hub 12 corresponding to the free end of the free arm 1652 is provided with a through window area W2, the surface of the extension 156 of the cannula hub corresponding to the through window area W2 is provided with at least one limit groove 1561 including a through groove, and the strip-shaped embedding projection 17d can be embedded into the limit groove 1561.

The single vertical hub handle 16b has a laterally projecting lateral extension 166. A paddle-like forward bend 1663 is attached to the upper end of the lateral extension 166. the forward bend 1663 defines an opening 1664 for receiving the infusion hose 13.

In use, as shown in fig. 9B, the thumb T grips the left side of the needle hub handle 16B, the index finger F grips the right side of the needle hub handle 16B, so that the block-shaped embedding protrusion 17d at the free end of the vertical part free arm 1652 is embedded into the limiting groove 1561 of the extension part 156 of the cannula hub, and the indentation longitudinally straddles the infusion tube 13 at the upper end of the needle hub handle 16B, at this time, the needle tip inclined plane P faces upward, and the lateral part 155 of the cannula hub is also upward, i.e., perpendicular to the horizontal plane, and is in the same direction as the vertical part 165 of the vertical needle hub handle 16B.

To increase the stability of the manipulation, a finger rest 1655 is provided on the rear end 162 of the vertical portion 165 of the vertical hub handle 16b.

Example 8:

as shown in fig. 10A and 10B, unlike embodiment 7, in order to facilitate simultaneous pressing of the vertical portion release arm 1652 and the infusion tube 13 by the fingers, the upper end of the vertical portion 165 has a depressed area 1654 for facilitating the longitudinal riding of the infusion tube 13; to facilitate simultaneous finger indenting of the infusion hose 13 longitudinally riding on the recessed area 1654 of the needle hub handle 16 b; a finger rest 1655 is provided on the rear end 162 of the vertical portion 165 of the needle hub handle 16b, and an opening for receiving the infusion hose 13 is provided at the upper end of the finger rest 1655.

Example 9:

as shown in FIGS. 11A and 11B, the most important difference from the previous embodiment is that a needle holder handle 16 is connected to the main body of the needle holder 12; the horizontal needle tube seat handle 16c comprises a blade-shaped horizontal part 167 which extends from the side surface 124 of the main body of the needle tube seat 12 and is convenient for fingers to hold, wherein the horizontal part means that the needle tube 11 of the indwelling needle is placed in parallel on a horizontal plane, when the inclined plane P of the tip 111 of the needle tube is upward, the part of the needle tube seat handle 16 which is convenient for fingers to hold is parallel or approximately parallel to the horizontal plane, namely, the horizontal part 167 is parallel or approximately parallel to the horizontal plane, and the configuration is similar to that of the horizontal needle holding indwelling needle commonly used by clinical nurses at present; an arched horizontal part free arm 1673 in the shape of a strip is connected to the upper surface of the horizontal part 167, the free arm 1673 can rotate axially by the linear connecting part 1674 of the free arm 1673 and the horizontal part 167, and the inner side of the free end of the free arm 1673 is provided with a contact part 17 which specifically comprises a strip-shaped embedding protrusion 17 e; the needle tube seat 12 has a through window area W2 at the part corresponding to the free end of the free arm 1673, a limit groove 1561 including a through groove is provided on the surface of the extension part 156 of the cannula seat corresponding to the through window area W2, and the bar-shaped embedding protrusion 17e can be embedded in the limit groove 1561.

As shown in FIG. 11B, when the needle cannula holder is used, the handle 16c of the horizontal needle cannula holder is held by two fingers of one hand without contacting the free arm 1673, the body of the cannula holder 15 is pulled axially downward by the other hand, the elastic member 18 is compressed and deformed, the tip 111 of the needle cannula is exposed from the opening 144 of the distal end of the cannula retreated, and then the free arm 1673 connected to the upper surface of the handle 16c of the horizontal needle cannula holder is pressed by the fingers, and the free arm 1673 is rotated or directly deformed by pressing with the linear connecting portion 1674 in the axial direction, that is, toward the central axis L1 of the needle cannula, so that the engaging projection 17e of the free end of the free arm 1673 is engaged with the engaging groove 1561 of the extension 156 of the cannula holder, and the needle.

After blood return is seen during puncture, the pressing force of fingers on the needle tube seat handle 16c is reduced or relieved to reset the free arm 1673, the embedding protrusion 17e is moved out of the limiting groove 1561 on the sleeve seat 15, the elastic potential energy of the elastic component 18 is released to push the sleeve seat 15 to move towards the direction far away from the needle tube seat 12, and finally the sharp needle tube tip 111 is covered by the soft sleeve top end 141.

In order to resist the backward movement of the needle holder 12 caused by the elastic force of the elastic member 18, i.e., the movement in the direction away from the needle tip 111, the front end of the leaf-shaped horizontal portion 167 of the horizontal needle holder handle 16c is connected to a leaf-shaped upward extension 168, and the inner side surface of the upward extension 168 can abut against the fingers, mainly the thumb T, to prevent the backward movement of the needle holder 12.

The cannula holder 15 can rotate to the side branch 155 connected with the infusion hose 13 and is positioned at the same side of the horizontal needle tube holder handle 16c, the infusion hose 13 penetrates through the lower surface of the needle tube holder handle 16c, the infusion hose 13 can be clamped between the index finger F (not shown) and the lower surface of the needle tube holder handle 16c when the operation is carried out according to the steps, and active sensitive blood return can be realized by restoring the infusion hose 13 after the infusion hose is depressed.

Example 10:

as shown in fig. 12A and 12B, the most difference from embodiment 9 is that a blade-shaped upward extending portion 168 is connected to the front end of a blade-shaped horizontal portion 167 of a horizontal needle holder handle 16c, and a horizontally extending backward bent portion 1681 is connected to the upper end of the upward extending portion 168, so that the horizontal portion 167 and the backward bent portion 1681 of the horizontal needle holder handle 16c form a finger-clip structure, thereby improving the stability of manipulation.

The transfusion hose 13 passes through the upper surface of the horizontal part 167 of the horizontal needle tube seat handle 16c, the bottom end of the horizontal part 167 is provided with an upward folded edge 1671 which is opened upwards, and the upper surface of the horizontal part 167 of the handle 16c is provided with a shallow groove 1672 which is beneficial for fixing the transfusion hose 13 by fingers.

Example 11:

as shown in the first series of fig. 13A, 13B and so on 13, the main body of the needle cannula holder 12 is cylindrical, and a sleeve holder extension 156 having a smaller outer diameter and also having a cylindrical shape is fitted therein, and the main body of the needle cannula holder 12 is connected to a needle cannula holder handle 16; in particular to a ring-shaped needle tube seat handle 16d, which comprises a curling part 169 which extends upwards and backwards from the upper end surface 122 of the needle tube seat 12 main body and is in a curling blade shape and is convenient for fingers to hold; as shown in fig. 13B, in use, the index finger F contacts the inner side 1691 of the curl 169, the thumb T contacts the outer side 1692 of the curl 169, the curl 169 has a forwardly extending free arm 1693 of the curl 169 having a contact member 17 at its free end, which may include a bar-shaped engaging projection 17F; the upper end surface 122 of the needle holder 12 corresponding to the free end of the free arm 1693 is provided with a through window area W4, the surface of the extension 156 of the cannula holder corresponding to the through window area W4 is provided with a limit groove 1561 including the through groove, and the strip-shaped embedding protrusion 17f can be embedded into the limit groove 1561.

As shown in FIG. 13C, when the compression spring 18a is compressed and deformed and the fitting projection 17f is fitted into the stopper groove 1561, the tip end 111 of the needle tube is exposed, and the infusion tube 13 longitudinally rides on the outside 1692 of the curled portion 169 of the ring-shaped needle holder handle 16d, the needle tip slope P faces upward, and the holder-side 155 also faces upward.

Referring to fig. 13D, the thumb T depresses the infusion tube 131, the fitting projection 17f is still fitted into the holding groove 1561, and the compression spring 18a is compressed and deformed.

As shown in fig. 13E, the thumb T reduces the pressure on the depressed infusion tube 131 to restore or partially restore the state of the infusion tube 132, and a negative pressure is generated to suck the blood in the venous lumen V0, while the fitting projection 17f is still fitted into the stopper groove 1561, and the compression spring 18a is compressed and deformed.

After blood returns, as shown in fig. 13F, the thumb T further reduces the pressure on the outside 1692 of the curled portion 169 of the needle holder handle 16d, the free arm 1693 is restored by its own elasticity, and the embedded protrusion 17F is pulled out from the retaining groove 1561, the compression spring 18a is released, and the cannula holder 15 is pushed forward, and the tip 111 of the needle tube is covered by the tip 141 of the cannula.

Example 12:

as shown in the first series of drawings of fig. 14A, 14B, etc., the most significant difference from the embodiment 11 is that a curled part 169 in the shape of a curled blade extending upward and rearward from the upper end face 122 of the needle hub 12 for easy finger gripping, and the curled part 169 extending rearward continues to extend downward to be fused with the upper end face 122 of the needle hub to form a closed ring-shaped needle hub grip 16 d; the free end of the free arm 1693 of the curl 169 is provided with a contact member 17, which may specifically comprise a bar-shaped inlay protrusion 17 f; the free arm 1693 is also provided with a branch 1694 which extends to and can touch the upper end 153 of the main body of the cannula holder 15, the upper end 153 of the cannula holder corresponding to the branch 1694 is provided with a through windowing area W5 which is sealed by a film-shaped elastic body E, the inner side surface E1 of the elastic body E is connected with the front cavity 150a of the cannula holder, namely an infusion cavity, the tail end 1695 of the branch 1694 of the free arm 1693 can touch and press the outer side surface E2 of the elastic body E, so that the elastic body E slightly protrudes into the front cavity 150a of the cannula holder, liquid medicine in the front cavity 150a of the cannula holder can be discharged by one or a plurality of drops from the needle hole 112, when the puncture is provided with a breakthrough feeling, obvious blood return can not be seen, the finger can be released to press the elastic body E by the tail end 1695 of the branch 1693, and negative pressure attraction force generated by the.

The use process can be as follows:

the first step is as follows: as shown in FIG. 14C, compression spring 18a is compressed and the shallow engaging projections 17f on release arm 1693 engage the retaining grooves 1561 to expose the tip 111 of the needle cannula, leaving the diaphragm elastomer E in the fenestrated area W5 of the upper end 153 of the cannula hub uncompressed by the distal end 1695 of the branch 1694 of release arm 1693.

The second step is that: as shown in FIG. 14D, the compression spring 18a is compressed and deformed, the engaging projection 17f of the release arm 1693 is deeply engaged with the stopper groove 1561, the tip 111 of the needle tube is exposed, and the diaphragm-like elastic body E in the window area W5 of the upper end 153 of the cannula holder is pressed by the end 1695 of the branch 1694 of the release arm 1693 and deformed toward the front cavity 150a of the cannula holder, so that one or more drops of the medical fluid in the front cavity 150a of the cannula holder is discharged from the needle hole 112.

The third step: in the puncturing operation, as shown in fig. 14C, the compression spring 18a is compressed and deformed, the embedding protrusion 17f on the free arm 1693 is shallowly embedded into the limit groove 1561, the tip 111 of the needle tube is exposed, the degree of pressure of the thumb T on the outer side 1692 of the curled portion 169 is reduced, the pressing of the tail end 1695 of the branch 1694 of the free arm 1693 on the diaphragm-shaped elastic body E in the window area W5 at the upper end 153 of the cannula holder is released, the diaphragm-shaped elastic body E is restored, and the negative pressure suction force generates active sensitive blood return.

The fourth step: as shown in FIG. 14E, further reducing the pressure of the thumb T on the outside 1692 of the curl 169, the engaging projection 17f on the free arm 1693 disengages from the retaining groove 1561, the compression spring 18a is released, pushing the cannula holder 15 forward, and the needle tip 111 is covered by the cannula tip 141.

The handle 169 of the ring-shaped needle holder handle 16d of the present embodiment has two openings on the left and right sides, and is a fingerstall-type handle similar to that of embodiment 4 as a flexible closable one-side opening, thereby further improving the stability of the operation.

Various types of transfusion devices can replace the puncture needle connected with the transfusion device by the venous indwelling needle 1.

Claims

1. A safety type venous indwelling needle comprising: a rigid needle cannula (11) for piercing the skin and vein wall, a needle cannula holder (12) holding a needle cannula base end portion (114) therein; a flexible cannula (14), a cannula holder (15) sealingly connected to the cannula base end (142), the cannula holder (15) having a hollow side branch (155) for connection to the infusion hose (13), an elastic isolating plug (19) in a tubular cannula holder extension (156) dividing the cannula holder interior (150) into a front chamber (150a) and a rear chamber (150 b); the front end part (113) of the needle tube (11) passes through the isolating plug (19) and is positioned in the cannula cavity (140); the intravenous puncture needle is characterized in that at least one elastic component (18) which can deform under the action of external force and comprises a selectable compression spring (18a) is arranged between a needle tube seat (12) and a cannula seat (15) which are mutually sleeved, when intravenous puncture is started, an operator fixes the needle tube seat (12) with one hand and acts on the cannula seat (15) with the other hand to drive the cannula seat to axially move towards the direction close to the needle tube seat (12) and forces the elastic component (18) between the two to deform to store elastic potential energy; the intravenous puncture needle is characterized by also comprising at least one needle tube seat handle (16) which can be connected with the needle tube seat (12) into a whole, wherein the needle tube seat handle (16) is provided with a contact part (17) which can be driven by external force to contact the cannula seat (15), when intravenous puncture is started, the contact part (17) is pressed towards the cannula seat (15) by the fingers of an operator, so that the relative positions of the two parts are fixed, and the deformation state of the elastic part (18) cannot be recovered; in the process of venipuncture, after the sharp end (111) of the needle tube enters a vein cavity, the pressing force of fingers on the handle (16) of the needle tube seat is reduced or relieved, so that the elastic component (18) can be deformed and restored, the sleeve tube seat (15) is forced to drive the sleeve tube (14) to move towards the direction far away from the needle tube seat (12) due to the elastic restoring force generated by the release of the elastic potential energy of the elastic component (18), and the sharp needle tube sharp end (111) can be coated by the top end (141) of the sleeve tube; the elastic restoring force of the elastic component (18) after deformation is larger than the resistance of the elastic isolating plug (19) which is positioned in the inner cavity (150) of the cannula holder to the needle tube part (115) which penetrates through the elastic isolating plug.

2. The safety type venous indwelling needle of claim 1, wherein the needle holder (12) body is cylindrical, a sleeve holder extension (156) having a smaller outer diameter and also being cylindrical is sleeved therein, and the needle holder (12) body is connected with a needle holder handle (16); the needle tube seat handle is characterized by specifically being a vertical needle tube seat handle (16a) which comprises two blade-shaped parts which extend out from the upper end surface (122) of a needle tube seat (12) main body and are convenient for fingers to hold and are vertical parts (165), wherein at least one vertical needle tube seat handle (16a) and the needle tube seat (12) main body are movably and axially connected in a linear shape (163) with two radial gaps (G1), the arc-shaped needle tube seat (12) part between the two radial gaps (G1) is an arc-shaped part (164) of the vertical needle tube seat handle (16a), and the arc-shaped part (164) is connected with the vertical parts (165) on the upper end surface (122) of the needle tube seat (12) main body; the inner side of the arc-shaped part (164) of the handle (16a) of the vertical needle tube seat is provided with a contact part (17) which can be contacted with the extension part (156) of the cannula seat under the driving of external force, and the contact part specifically comprises a local bulge (17a) at the inner side of the arc-shaped part (164).

3. The safety type venous indwelling needle of claim 2, further comprising a blade-like lateral extension (166) connected to the forward end (161) of the vertical portion (165) of the vertical hub handle (16 a).

4. The safety type venous indwelling needle of claim 2, further comprising a blade-like lateral extension (166) connected to the front end (161) of the vertical portion (165) of the vertical hub handle (16a) and a rearward bend (1661) connected to the lateral extension (166).

5. The safety type venous indwelling needle of claim 2, further comprising a blade-like lateral extension (166) connected to the front end (161) of the vertical portion (165) of the vertical hub handle (16a), a rearward bend (1661) connected to the lateral extension (166), and a horizontal extension (1662); the horizontal extension part (1662) is connected with the upper edges of the vertical part (165), the lateral extension part (166) and the rear bending part (1661).

6. A safety type venous indwelling needle according to claim 2, wherein the base end portion (125) of the needle hub is provided with a finger rest (1252) which conforms to the outer contour of a finger, particularly the middle finger (M).

7. The safety type venous indwelling needle of claim 2, wherein the rear ends (162) of the vertical portions (165) of the two vertical hub handles (16a1, 16a2) are integrally connected.

8. The safety type venous indwelling needle of claim 2, wherein the upper ends of the vertical portions (165) of the two vertical hub handles (16a1, 16a2) are integrally connected, and at least one side is provided with a U-shaped slit (G2) with three open sides, thereby forming a free arm (1652) of the vertical portion (165) in the shape of a strip; the free arm (1652) is axially rotatable about a linear connecting portion (1653) between the free arm (1652) and the vertical portion (165), and a contact member (17), which may include a block-shaped insert protrusion (17d), is provided on an inner side of the free end of the free arm (1652).

9. The safety type venous indwelling needle according to claim 2, wherein the contact part (17) of the vertical needle holder handle (16a) is at least one linear convex rib (17c) arranged inside the arc-shaped part (164); at least one arc-shaped recess (1562) which can be embedded with the sleeve seat extension part (156) is arranged on the surface of the sleeve seat extension part (156) at the position corresponding to the linear convex rib (17 c).

10. The safety type venous indwelling needle of claim 2, wherein the contact part (17) of the vertical needle holder handle (16a) is a bar-shaped embedding bulge (17b) inside the arc-shaped part (164); at least one limiting groove (1561) comprising a through groove is arranged on the surface of the sleeve seat extension part (156) at the corresponding position of the strip-shaped embedding bulge (17b), and the embedding bulge (17b) can be embedded into the limiting groove (1561).

11. The safety type venous indwelling needle of claim 1, wherein the needle holder (12) body is cylindrical, a sleeve holder extension (156) having a smaller outer diameter and also being cylindrical is sleeved therein, and the needle holder (12) body is connected with a needle holder handle (16); specifically, a vertical type needle tube holder handle (16b) comprises a blade-shaped part which is extended from the upper end surface (122) of the needle tube holder (12) and is convenient for fingers to hold, a vertical part (165), a strip-shaped vertical part free arm (1652) connected with one side of the vertical part (165), the free arm (1652) can rotate in the axial direction of a linear connecting part (1653) of the free arm (1652) and the vertical part (165), and a contact part (17) is arranged on the inner side of the free end of the free arm (1652), and specifically, a strip-shaped embedding bulge (17d) can be included; the needle tube seat side surface (124) part of the needle tube seat (12) main body corresponding to the free end of the free arm (1652) is provided with a through windowing area (W2), the surface of the sleeve seat extending part (156) corresponding to the through windowing area (W2) is provided with at least one limiting groove (1561) comprising the through groove, and the strip-shaped embedding bulge (17d) can be embedded into the limiting groove (1561).

12. The safety type venous indwelling needle of claim 11, wherein the vertical hub handle (16b) has a lateral extension (166) with a paddle-like forward bend (1663) attached to the upper end of the lateral extension (166), the forward bend (1663) having an opening (1664) for receiving the infusion tube (13).

13. The safety type venous indwelling needle of claim 11, wherein the vertical hub handle (16b) has a lateral extension (166) to which is attached a paddle-like forward bend (1663) at the upper end of the lateral extension (166), the forward bend (1663) having an opening (1664) for partially receiving the infusion tube (13); the upper end of the vertical part (165) is provided with a concave area (1654) which is convenient for the infusion hose (13) to ride longitudinally.

14. The safety type venous indwelling needle of claim 1, wherein the needle holder (12) body is cylindrical, a sleeve holder extension (156) having a smaller outer diameter and also being cylindrical is sleeved therein, and the needle holder (12) body is connected with a needle holder handle (16); the horizontal needle tube seat handle (16c) comprises a blade-shaped horizontal part (167) extending from the side surface (124) of the needle tube seat (12) body and convenient to hold by fingers, the upper surface of the horizontal part (167) is connected with an arched strip-shaped horizontal part free arm (1673), the free arm (1673) can rotate in the axial direction by taking a linear connecting part (1674) of the free arm (1673) and the horizontal part (167) as an axial direction, and the inner side of the free end of the free arm (1673) is provided with a contact part (17) which can specifically comprise a strip-shaped embedding bulge (17 e); the part of the needle tube seat (12) main body corresponding to the free end of the free arm (1673) is provided with a through windowing area (W2), the surface of the sleeve tube seat extending part (156) corresponding to the through windowing area (W2) is provided with at least one limiting groove (1561) comprising the through groove, and the strip-shaped embedding bulge (17e) can be embedded into the limiting groove (1561).

15. The safety type venous indwelling needle of claim 14, wherein the side branch (155) of the cannula holder (15) connected to the infusion tube (13) is located on the same side of the horizontal needle holder handle (16c), and the front end of the blade-shaped horizontal part (167) of the horizontal needle holder handle (16c) is connected to the blade-shaped upward extension part (168).

16. The safety type venous indwelling needle according to claim 14, wherein the side branch (155) of the cannula holder (15) connected to the infusion tube (13) is located on the same side of the horizontal needle holder handle (16c), the front end of the blade-shaped horizontal part (167) of the horizontal needle holder handle (16b) is connected to a blade-shaped upward extension part (168), and the upper end of the upward extension part (168) is connected to a horizontally-extended backward bending part (1681).

17. The safety type venous indwelling needle of claim 1, wherein the needle holder (12) body is cylindrical, a sleeve holder extension (156) having a smaller outer diameter and also being cylindrical is sleeved therein, and the needle holder (12) body is connected with a needle holder handle (16); the finger ring type needle tube seat handle (16d) comprises a curling part (169) which extends upwards and backwards from the upper end surface (122) of the needle tube seat (12) main body and is in a curling blade shape and convenient for fingers to hold, the curling part (169) is provided with a curling part (169) free arm (1693) extending forwards, the free end of the curling part is provided with a contact part (17), and the finger ring type needle tube seat handle can specifically comprise a strip-shaped embedded bulge (17 f); the upper end surface (122) part of the needle tube seat (12) main body corresponding to the free end of the free arm (1693) is provided with a through windowing area (W4), the surface of the sleeve seat extending part (156) corresponding to the through windowing area (W4) is provided with a limit groove (1561) comprising the through groove, and the strip-shaped embedding bulge (17f) can be embedded into the limit groove (1561).

18. Safety type venous indwelling needle according to claim 17, characterised in that the free end of the free arm (1693) of the crimp (169) is provided with a contact member (17), in particular comprising a block-shaped inlay protrusion (17 f); the free arm (1693) also has a branch (1694) which extends towards and can reach the upper end (153) of the main body of the cannula holder (15), and the upper end (153) of the cannula holder corresponding to the branch (1694) is provided with a through windowing area (W5) which is closed by a film-shaped elastic body (E).

19. The safety type venous indwelling needle of any one of claims 1 to 18, wherein the needle hub handle (16) is a separate type needle hub handle (16e) formed as a separate component or assembly and is integrally attached to the needle hub (12).

20. The safety type venous indwelling needle of any one of claims 1 to 18, wherein the needle hub (12) is cylindrical in shape, a smaller outer diameter and also cylindrical extension (156) of the cannula hub is sleeved therein, and distance indicating marks (1564) including mark lines and mark points are provided on the surface of the extension (156) of the cannula hub.

21. The safety type venous indwelling needle of any one of claims 1 to 18, wherein the needle hub handle (16) is provided with restraining and guiding means for the infusion hose (13) including a selectable hook (1651), a recess (1654), an opening (1664), and shallow grooves (1672).