CN107335114B

CN107335114B - Needle head structure

Info

Publication number: CN107335114B
Application number: CN201611019932.6A
Authority: CN
Inventors: 黄翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-29
Filing date: 2016-11-18
Publication date: 2020-06-05
Anticipated expiration: 2036-11-18
Also published as: CN107335114A; WO2017185729A1

Abstract

The invention discloses a needle head structure, which comprises a needle body, a shell and a separator. The needle body cavity of the needle body is connected with the needle opening. The needle body is connected to the shell and comprises a shell cavity and an opening, and the needle body cavity is communicated with the shell cavity to form a needle head cavity. The partition separates the needle cavity into a first chamber and a second chamber, the first chamber and the second chamber being isolated from each other. The needle port is divided into an injection port and a blood return port by the partition, the first cavity is filled with filler and communicated with the injection port, and the second cavity is connected with the blood return port and the opening. The blood vessel of the human body has natural pressure no matter the artery and the vein, so that blood return can occur when the blood vessel is injected, the blood return condition is confirmed by utilizing the transparency and the opening of the second cavity, the blood vessel embolism caused by hitting the blood vessel when an injector beats can be avoided, and the operation safety is further improved.

Description

Needle head structure

Technical Field

The present invention relates to a needle structure, and more particularly, to a needle structure capable of instantly confirming blood return status to improve the safety of operation.

Background

When a tip needle (sharp needle) of a common needle set is used for injecting a filler (such as hyaluronic acid), air in a cavity of the needle head is not injected into tissues in order to avoid bacterial infection. Before injection, a user can firstly perform the action of exhausting air, the filler is firstly pushed into the cavity in the needle head, and the injection can not be performed until the cavity in the needle head is filled with the hyaluronic acid and the air in the needle head is determined to be free.

Generally, fillers for injection in medical and aesthetic fields are not liquid but are nearly solid, and therefore, it is necessary to avoid the position of blood vessels during injection. Once injected into blood vessels, the injection can cause the blockage of the blood vessels, and is easy to cause serious side effects such as skin necrosis, blindness, stroke, pulmonary embolism and the like.

The site of injection of the filler is usually subcutaneous, however, in practice there is no way to visually confirm the presence or absence of blood vessels in the subcutaneous tissue, and therefore blind injection (blind injection) is considered, since there is no way to determine the site of injection one hundred percent at the time of injection. Therefore, in practice, the injector must know the anatomy, select an appropriate injection plane and position, use a blunt needle (blunt cannula), or perform an aspiration (asparate) operation during injection to confirm the presence or absence of flashback and ensure that the injection will not be injected into the blood vessel.

The technique of performing a drawing back operation at the time of injection to confirm the presence or absence of blood return is known. However, the injected filler has different viscosity coefficients according to the material, and the viscous filler is more viscous, such as: microcrystalline porcelain (Radiesse), lotus wire (Ellanse) or macromolecular hyaluronic acid, which fills the cavity in the needle after venting. If the needle point is in the blood vessel when injecting the fillers, even if the drawing back action is carried out, the viscosity of the fillers can cause that the blood cannot flow back into the syringe, so that the blood return phenomenon cannot be observed. If the syringe is pushed continuously to inject the filler into the blood vessel at the moment, the blood vessel is embolized. Therefore, even if the back-pumping method is used, if a filler with a large viscosity coefficient is used, the risk of misjudgment still exists.

Another known technique is to use a blunt needle, the tip of which is not pointed but is curved. Theoretically, the blood vessel is less injured, but a blunt needle that is too thin still has some degree of puncture force of a sharp needle (sharp needle), and thus there is still a risk of puncturing the blood vessel with the blunt needle. It is clear from the above that both sharp and blunt needles pose a certain risk during injection, mainly because after the needle tip has entered the skin, the injector has no way of knowing with certainty whether the needle tip is inside the blood vessel. Therefore, the market is lack of needle structure that can quickly confirm the blood return and greatly reduce the risk of operation failure, so the related industry is seeking the solution.

Disclosure of Invention

Therefore, the invention provides a needle head structure, which can enable an injector to know whether a needle point is in a blood vessel or not by utilizing a blood return phenomenon generated by natural pressure in the blood vessel without drawing back after the needle point enters the skin. In addition, the needle structure of the invention is provided with a first chamber and a second chamber which are not communicated, the first chamber is filled with filler, and the second chamber is transparent and provided with an opening for confirming the condition of blood return. When the opening is opened, the blood return condition can be confirmed, if the opening is closed, the injection filler can be prevented from flowing back to enter the second cavity, so that an injector can prevent the filler from being injected into a blood vessel to cause blood vessel embolism when the injector is used, and the safety of the operation is further improved. In addition, the special needle head structure enables an injector to conveniently operate, and enables the injector to more smoothly complete the injection treatment course.

One embodiment of the present invention is a needle structure for injecting a filler and monitoring blood return. The needle structure comprises an inner needle part and an outer needle part. Wherein the inner needle part comprises a first needle body and a first shell. The first needle body comprises a needle body cavity and a needle opening, and the needle body cavity is connected with the needle opening. The first shell is connected with the first needle body and comprises a shell cavity. The housing chamber is communicated with the needle chamber to form a first chamber. The first chamber contains a filling material and is in communication with the needle port. In addition, the outer needle portion is arranged around the outer side of the inner needle portion and comprises an opening and a blood return port. A second chamber is formed between the outer needle part and the inner needle part, and the second chamber and the first chamber are isolated from each other. The outer needle portion may include a second needle body and a second housing. Wherein the second needle body is arranged at the outer side of the first needle body in a surrounding way. The blood return port is arranged on the second needle body. In addition, the second shell is connected with the second needle body and is arranged on the outer side of the first shell in a surrounding mode. The opening is arranged on the second shell. The second housing is transparent or translucent and includes a proximal portion and a distal portion. The proximal portion has two ends, one of which is connected to the second needle and the other of which is connected to the distal portion. The opening is provided on the distal end portion. The inner needle portion is displaceably positioned at the proximal and distal end portions. When the first needle body is not inserted into the second needle body, the opening is communicated with the second needle body through the proximal end part to return the blood port, and the second shell is used for distinguishing whether blood enters the second cavity or not so as to deduce whether the second needle body at the outer needle part is inserted into a blood vessel or not; when the first needle body is inserted into the second needle body, the filler in the inner needle part is injected to the needle opening. In addition, the filler may be Hyaluronic Acid (hydraronic Acid), Calcium Hydroxyapatite (Calcium hydroxide, radiasse), Polycaprolactone (Polycaprolactone, elanse), Collagen (Collagen), Poly-L-Lactic Acid (PLLA, scultra), Fat (Fat), polyallylamine (Aaquamid), Triamcinolone Acetonide (Triamcinolone Acetonide), or Lidocaine (Lidocaine).

Therefore, the needle head structure of the invention forms a special annular cavity through the inner needle part and the outer needle part, can be used for confirming the blood return condition, and can prevent filler from being injected into blood vessels to cause blood vessel embolism when an injector injects the filler, thereby greatly improving the safety of the operation.

Other examples of the foregoing embodiments are as follows: the second needle body is a blunt needle or a sharp needle. In addition, the outer needle portion may include a connecting seat and an injection assembly. The connecting seat is communicated with the opening and connected with the second shell. The injection assembly is connected with the connecting seat and comprises an injection shell and an injection rod. The injection housing is detachably connected with the connection base. The injection rod is arranged in the injection shell and can be movably positioned in the injection shell.

Drawings

Fig. 1 is a perspective view illustrating a needle structure according to an embodiment of the present invention.

Fig. 2 is a side view of the needle tip structure of fig. 1.

Fig. 3 is a cross-sectional view illustrating a cross-sectional line 3-3 of fig. 2.

Fig. 4A is a schematic closing diagram of the switch portion of fig. 1.

Fig. 4B is a schematic diagram illustrating the switch portion of fig. 1.

Fig. 5 is a schematic diagram illustrating the operation of the needle tip structure of fig. 1.

Fig. 6 is a side view showing a needle structure according to another embodiment of the present invention.

Fig. 7 is a sectional view showing a sectional line 7-7 of fig. 6.

Fig. 8 is a perspective view of a needle structure according to another embodiment of the present invention.

Fig. 9 is a side view showing a needle structure according to still another embodiment of the present invention.

FIG. 10A is a side view of a needle structure according to another embodiment of the present invention showing blood return confirmation.

Fig. 10B is a side view of the needle structure of fig. 10A during injection.

FIG. 11A is a side view of a needle structure showing blood return confirmation according to yet another embodiment of the present invention.

Fig. 11B is a side view of the needle structure of fig. 11A during injection.

FIG. 12A is a schematic view of a needle structure inserted into a blood vessel according to yet another embodiment of the present invention.

Fig. 12B is a schematic view showing the needle structure of fig. 12A during injection.

FIG. 13A is a cross-sectional view of the outer needle portion of a needle tip structure according to another embodiment of the present invention.

Fig. 13B is a side view of the needle structure of fig. 13A during injection.

FIG. 13C is a side view of a needle tip structure according to yet another embodiment of the present invention.

Detailed Description

Various embodiments of the present invention will be described below with reference to the accompanying drawings. For the purpose of clarity, numerous implementation details are set forth in the following description. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, these implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner; and repeated elements will likely be referred to using the same reference numerals.

Please refer to fig. 1-4B. Fig. 1 is a perspective view of a needle structure 100 according to an embodiment of the invention. Fig. 2 is a side view of the needle tip structure 100 of fig. 1. Fig. 3 is a cross-sectional view illustrating a cross-sectional line 3-3 of fig. 2. Fig. 4A is a schematic diagram illustrating the switch portion 330 of fig. 1 being closed. Fig. 4B is a schematic diagram illustrating the switch portion 330 of fig. 1 being turned on. As shown, needle structure 100 is used to inject a filling material, such as Hyaluronic Acid (Hyaluronic Acid), microcrystalline porcelain (Radiesse), lotus (Ellanse), Collagen (Collagen), Poly-L-Lactic Acid (PLLA; Sculptra), Fat (Fat), polyallylamine (Aaqua), or other drugs that are not suitable for injection into a blood vessel, such as: triamcinolone Acetonide (Triamcinolone Acetonide) or Lidocaine (Lidocaine). The main component of the above-mentioned microcrystalline porcelain (Radiesse) is Calcium Hydroxyapatite (Calcium hydroxide), and the main component of lotus silk (Ellase) is Polycaprolactone (Polycaprolactone). From the above, the needle structure 100 of the present invention can be applied to various medical requirements. The needle structure 100 includes a needle 200, a housing 300, and a separator 400.

The needle body 200 comprises a needle chamber 210 and a needle port 220, the needle chamber 210 being connected to the needle port 220. The needle body 200 may be a blunt needle or a sharp needle. The blunt needle has a circular arc-shaped front end, and a needle opening 220 is located at the side of the front end. The sharp needle is a common bevel needle. The needle body 200 is a thin and long metal tube and has a hollow cylindrical shape so as to be easily inserted into or withdrawn from the skin.

The housing 300 is connected to the needle 200. Housing 300 includes a housing chamber 310, an aperture 320, a switch portion 330, and a housing wall 340, with needle chamber 210 communicating with housing chamber 310 to form needle cavity 102. Furthermore, the opening 320 is opened at the side of the housing wall 340. The opening and closing portion 330 corresponds to the opening 320 and is disposed on the housing wall 340, and the opening and closing portion 330 opens or closes the opening 320. In detail, the switch portion 330 is a movable valve that can be opened or closed to connect or isolate the housing chamber 310 inside the housing 300 to the outside air. The switch section 330 may control the switch manually. In addition, the housing 300 is made of hard plastic and may be transparent or translucent, and the housing wall 340 of the present embodiment is transparent, which allows the injector to quickly distinguish whether blood enters the housing chamber 310.

A partition 400 is disposed in the needle cavity 102, and the partition 400 separates the needle cavity 102 into a first chamber 410 and a second chamber 420. The first chamber 410 and the second chamber 420 are isolated from each other. In addition, divider 400 separates needle port 220 from injection port 430 and blood return port 440. The first chamber 410 is filled with filler and communicates with the injection port 430, and the second chamber 420 connects the blood return port 440 and the opening 320. In other words, the present invention is a configuration in which the needle cavity 102 in the needle structure 100 is divided into two chambers by the partition 400, which are the first chamber 410 and the second chamber 420, respectively. The first chamber 410 and the second chamber 420 may be equal in size or one large and one small. The first chamber 410 and the second chamber 420 may be circular, elliptical, rectangular, or polygonal in shape.

Fig. 5 is a schematic diagram illustrating the operation of the needle structure 100 of fig. 1, wherein the first chamber 410 of the needle structure 100 is filled with a filling material, and the second chamber 420 is used for confirming blood return. The operation of the needle structure 100 can be divided into two steps. The first step is a piercing step in which the needle body 200 is pierced into the skin of the subject by the injector (doctor or medical staff). The second step is an injection step, which injects the filler into non-vascular tissue.

During the puncturing step, the injector can use the second chamber 420 to confirm the blood return condition, mainly by utilizing the capillary phenomenon and the pressure of the arteriovenous itself. If the needle port 220 pierces the blood vessel, the blood in the blood vessel will flow from the second chamber 420 to the opening 320, and the casing 340 is transparent adjacent to the opening 320, so that the injector can directly observe whether the blood return occurs. This is like the general blood drawing, in order to confirm whether the needle tip has entered into the blood vessel, the blood drawing person will observe the blood return condition at the position of the hard plastic shell 300 of the needle, because the blood of the blood vessel has a certain pressure, will push the air in the needle tip out, and then make the blood run into the shell 300 connected with the needle. The second chamber 420 of the present invention has a function in which the second chamber 420 has air therein but is not interconnected with the injection material of the first chamber 410, so that the first chamber 410 and the second chamber 420 are independent spaces. During injection, the second chamber 420 is maintained at atmospheric pressure, but once the needle tip penetrates the blood vessel, the injector can immediately observe the blood return at the transparent rigid plastic housing 300 of the needle because the capillary phenomenon follows the pressure of the artery and vein. Compared with the prior art, the needle structure 100 of the present invention can determine whether the needle is in the blood vessel without the need of withdrawing, and the injector can determine that the needle tip is not in the blood vessel as long as the injector sees no blood return in the puncturing step. Therefore, under the condition of no withdrawing action, an injector can use the needle structure 100 of the invention to inject safely, thereby not only increasing the safety of the operation, but also avoiding a plurality of unnecessary medical disputes. It should be noted that before puncturing, the injector opens the switch 330 of the housing 300, because the switch 330 can keep the air in the second chamber 420 at atmospheric pressure, once the needle tip is in the blood vessel, the injector can immediately see the blood back and stop the injection. When the injector determines that the injector is located at the injection position and determines that the injector does not move any more, the valve of the switching portion 330 is closed, and then the injection step is performed.

Since the injection step is to inject the filler into the non-vascular tissue, if it is determined that there is no blood return after the puncturing step, the injector can push the syringe to let the filler in the first chamber 410 enter the tissue smoothly after confirming that the needle tip is not in the blood vessel. In addition, in the injection step, the switch 330 closes the valve to keep the air in the second chamber 420 and maintain the fixed gas pressure of the second chamber 420, so that the filler in the first chamber 410 does not flow back into the second chamber 420 due to the pressure, and the space in the second chamber 420 is still open and not blocked. In addition, the filler is often injected in multiple points, and the injector can use the needle structure 100 again to perform the next position treatment after pulling out the needle structure 100, and at this time, the second chamber 420 can resume the function of detecting the blood return again as long as the valve of the switch portion 330 is opened. Therefore, the needle head structure 100 of the invention can make the injector know whether the needle point is in the blood vessel without drawing back after the needle point enters the skin, so that the injector can prevent the filler from being injected into the blood vessel to cause blood vessel embolism when beating, thereby improving the safety of the operation.

Referring to fig. 6 and 7 together, fig. 6 is a side view of a needle structure 100a according to another embodiment of the present invention. Fig. 7 is a sectional view showing a sectional line 7-7 of fig. 6. As shown, the needle structure 100a is used for injecting a filling material, and the needle structure 100a includes an inner needle portion 500 and an outer needle portion 600.

The inner needle portion 500 includes a first needle 510 and a first housing 520. The first needle 510 includes a needle chamber 512 and a needle port 514, the needle chamber 512 is connected to the needle port 514. The first housing 520 is connected to the first needle 510, and the first housing 520 includes a housing chamber 522. The housing chamber 522 communicates with the needle chamber 512 to form a first chamber 530, the first chamber 530 being filled with a filling and communicating with the needle port 514.

The outer needle portion 600 is disposed around the outer side of the inner needle portion 500, and the outer needle portion 600 includes a second needle body 610 and a second housing 620. Wherein the second needle body 610 is annularly arranged on the outer side of the first needle body 510, and the blood return port 612 is opened on the second needle body 610. In addition, the second shell 620 is connected to the second needle 610 and is disposed around the outside of the first shell 520. The opening 622 and the switch portion 624 are both opened on the second housing 620. Furthermore, a second chamber 630 is formed between the outer needle 600 and the inner needle 500, the second chamber 630 and the first chamber 530 are isolated from each other, and the second chamber 630 connects the blood return port 612 and the opening 622. The switch 624 has the same structure as the switch 330 in fig. 4A and 4B, and is not described again. In addition, the second casing 620 is made of hard plastic and may be transparent or semi-transparent, and the second casing 620 of the present embodiment is transparent, which allows the injector to quickly distinguish whether blood enters the second chamber 630. Therefore, the needle head structure 100a of the present invention forms a special annular chamber by the inner needle 500 and the outer needle 600, which can be used to confirm the blood return condition, and can prevent the filler from entering the blood vessel to cause the blood vessel embolism during the injection, thereby greatly improving the safety of the operation.

Fig. 8 is a perspective view of a needle structure 100b according to another embodiment of the present invention. The needle structure 100b includes a first needle 710, a first housing 720, a second needle 730, and a second housing 740. Wherein the first needle 710 includes a first needle chamber 712 and a first needle opening 714, the first needle chamber 712 is connected to the first needle opening 714, and the cross section of the first needle 710 can be circular, oval, rectangular or polygonal. The first housing 720 is connected to the first needle 710, and the first housing 720 includes a first housing chamber 722, and the first needle chamber 712 communicates with the first housing chamber 722 to form the first chamber 702. Moreover, the second needle 730 is fixedly connected to the first needle 710, and the two are attached to each other, and the cross section of the second needle 730 can be circular, oval, rectangular or polygonal. The second needle 730 includes a second needle chamber 732 and a second needle port 734. The second needle chamber 732 connects to the second needle port 734, and the second needle port 734 is adjacent to the first needle port 714. In addition, a second housing 740 is connected to the second needle 730, and the second housing 740 includes a second housing cavity 742, an opening 744, a switch portion 746, and a housing wall 748. The second needle chamber 732 communicates with the second housing chamber 742 to form the second chamber 704. The first chamber 702 and the second chamber 704 are isolated from each other. The first chamber 702 contains the filling and the second chamber 704 connects the second needle port 734 with the opening 744. The switch portion 746 is disposed on the housing wall 748, and the switch portion 746 opens or closes the opening 744. Furthermore, the housing wall 748 of the second housing 740 is partially transparent, which allows the injector to quickly identify whether blood is entering the second chamber 704. The switch portion 746 of this embodiment is a cover that is pivotally attached to the edge of the housing wall 748. When the switch portion 746 covers the housing wall 748, the second chamber 704 is isolated from the outside air. The switch 746 can be operated manually. It should be noted that one end of the second needle 730 can be curved, that is, the portion of the second needle 730 close to the second housing 740 is curved. The curved structure causes the extending direction of the first housing 720 to intersect with the extending direction of the second housing 740 at an angle. The included angle may be greater than 10 degrees and less than 90 degrees. The included angle of the present embodiment is 45 degrees, which aims to provide the second housing 740 with enough space, and the too small included angle can make the first housing 720 and the second housing 740 too close to each other, which is inconvenient when the switch portion 746 is operated. Therefore, the needle structure 100b of the present invention not only can confirm the blood return condition without drawing back, avoid the blood vessel embolism caused by the filler injected into the blood vessel to improve the safety of the operation, but also has convenient operation, and enables the injector to complete the injection treatment course more smoothly.

Fig. 9 is a side view of a needle tip structure 100c according to yet another embodiment of the present invention. The needle structure 100c includes a needle 800, a housing 300, and a partition 400. Referring to fig. 1, in the embodiment of fig. 9, the housing 300 and the partition 400 are respectively the same as the housing 300 and the partition 400 in fig. 3, and are not repeated. In particular, the needle tip structure 100c of the embodiment of fig. 9 is a blunt needle, and the tip of the needle body 800 is formed in an arc shape. Wherein the partition 400 is disposed in the needle cavity 102 and the partition 400 separates the needle cavity 102 into a first chamber 410 and a second chamber 420. The first chamber 410 and the second chamber 420 are isolated from each other. And the partition 400 separates the needle port 220 from the injection port 430 and the blood return port 440. The first chamber 410 is filled with filler and communicates with the injection port 430, and the second chamber 420 connects the blood return port 440 and the opening 320. Since the needle port 220 is located at the side of the front end, the injection port 430 and the blood return port 440 are both opened at the side of the front end of the needle body 800. It is worth mentioning that there is still a gap between the front end of the partition 400 near the needle port 220 and the injection port 430, which allows the injection of the filler and the monitoring of the blood return. In addition, if the front end of the partition 400 is aligned with the injection port 430, the injector may operate the needle structure 100c while the injection port 430 is inside the blood vessel and the blood return port 440 is outside the blood vessel, which is avoided. Therefore, the needle structure 100c has a first chamber 410 and a second chamber 420 which are not connected, the first chamber 410 is filled with the filler, the second chamber 420 is transparent, and the shell 300 is provided with the opening 320 and the switch portion 330 for confirming the blood return condition. When the opening 320 is open, a flashback condition is confirmed, and when closed, injection of filler into the second chamber 420 is avoided. The integral structure can prevent the filler from being injected into the blood vessel when an injector is injected, thereby improving the safety of the operation.

Fig. 10A is a side view of a needle structure 100d according to another embodiment of the present invention, illustrating blood return confirmation. Fig. 10B is a side view of the needle structure 100d of fig. 10A during injection. As shown, the needle structure 100d includes a needle 200, a housing 300, a partition 400a, and a catheter 900. The needle body 200 is a sharp needle. In the embodiment of fig. 10A and 10B, the needle 200 and the housing 300 are the same as the needle 200 and the housing 300 in fig. 2, respectively, and are not repeated. In particular, the partition 400A of the needle structure 100d of the embodiment of fig. 10A and 10B is disposed in the needle cavity 102 and has a first partition 402a, a second partition 404, and a blood return port 440, wherein the partition 400A separates the needle cavity 102 into a first chamber 410 and a second chamber 420. The blood return port 440 communicates the first chamber 410 and the second chamber 420, and the blood return port 440 is adjacent to the needle port 220. The blood return port 440 is interposed between the first partition 402a and the second partition 404, and the blood return port 440 has a bore D3. One end of the first partition 402a is connected to the inner wall of the needle body 200 and the other end is connected to the inner rim of the housing wall 340. The second partition 404 is located in the needle chamber 210 and is L-shaped in side view. In detail, the second chamber 420 connects the blood return port 440 and the opening 320 of the housing 300, such that the second chamber 420 is between the blood return port 440 and the opening 320. The flashback port 440 is spaced from the needle port 220 by a first distance D1. Furthermore, the conduit 900 has an injection port 910 and a tube wall 920, and the conduit 900 is movably disposed through the first chamber 410 and filled with a filler. The tube wall 920 is the same shape as the first chamber 410. When the injector operates the needle structure 100d, two steps are performed. The first step is to confirm the blood return, in which the injector inserts the catheter 900 into the first chamber 410 and displaces the injection port 910 to a specific position such that the second distance D2 between the injection port 910 and the needle port 220 is greater than the first distance D1. The second chamber 420 is now in communication with the needle port 220, allowing the injector to confirm the presence of the blood vessel by the flashback condition, as shown in FIG. 10A. The second step is injecting the filler, in which the injector further pushes the catheter 900 to the needle port 220 for a distance, so that the second distance D2 between the injection port 910 and the needle port 220 is smaller than or equal to the first distance D1, and the tube wall 920 of the catheter 900 closes the blood return port 440, thereby isolating the first chamber 410 and the second chamber 420 from each other. Then, the injector injects the filler in the catheter 900 to the needle port 220, and finally withdraws the needle body 200 to complete the injection procedure. This configuration prevents the filler from entering the second chamber 420 during injection and clogging, thereby reducing the difficulty of cleaning. It should be noted that after the injection is completed, the catheter 900 can be drawn out of the first chamber 410 and discarded for replacement, and the needle body 200 can be recycled after cleaning and sterilization and used in cooperation with another catheter 900 filled with a filler for the next injection. Because the filler is sticky, the traditional injection needle structure is easy to cause the blockage of the filler and cannot be used, and the invention not only can lead an injector to smoothly and safely complete the injection treatment course, but also can greatly reduce the risk of side effect or accident of the injected person.

Fig. 11A is a side view of a needle structure 100e according to another embodiment of the present invention, showing blood return confirmation. Fig. 11B is a side view of the needle structure 100e of fig. 11A during injection. As shown, the needle structure 100e includes a needle 200, a housing 300, a partition 400b, and a catheter 900. In the embodiment of fig. 11A and 11B, the needle 200, the housing 300 and the catheter 900 are the same as the needle 200, the housing 300 and the catheter 900 in fig. 10A and 10B, respectively, and thus the description thereof is omitted. In particular, the divider 400B of the needle structure 100e of the embodiment of fig. 11A and 11B has a first divider 402B, a second divider 404, and a flashback port 440, the divider 400B separating the needle cavity 102 into a first chamber 410 and a second chamber 420. Further, since the first partition 402B is shorter than the first partition 402a of fig. 10A, the caliber D3 of the blood return port 440 of the needle structure 100e of fig. 11A and 11B is larger than the caliber D3 of the blood return port 440 of the needle structure 100D of fig. 10A and 10B. In other words, the first partition 402b is only provided in the housing 300, and the second partition 404 near the needle port 220 is provided in the needle 200, and the needle chamber 210 of the needle 200 does not have the first partition 402 b. Under such a structure, the needle body 200 can be made into a thinner tube, that is, the needle body 200 with a smaller tube diameter can be made, so as to reduce the size of the wound caused by the puncture of the needle body 200. In addition, two steps are performed as well when the injector operates the needle structure 100 e. The first step is to confirm flashback, in which the injector inserts the catheter 900 into the needle chamber 210 and displaces the injection port 910 to a position such that the second spacing D2 between the injection port 910 and the needle port 220 is greater than the first spacing D1. At this time, a hollow chamber 422 is formed between the outer wall of the catheter 900 and the inner wall of the needle body 200, the hollow chamber 422 is a part of the second chamber 420, and the hollow chamber 422 and the needle port 220 are communicated with each other, so that the injector can confirm whether to hit the blood vessel by the condition of blood return, as shown in fig. 11A. The second step is injecting the filler, in which the injector further pushes the catheter 900 to the needle port 220 for a distance, so that the second distance D2 between the injection port 910 and the needle port 220 is smaller than or equal to the first distance D1, and the tube wall 920 of the catheter 900 closes the blood return port 440, so that the empty chamber 422 and the needle port 220 are isolated from each other. Then, the injector injects the filling material in the catheter 900 to the needle port 220. Finally, when the injection of the filler is completed, the catheter 900 is withdrawn from the needle 200 and the first chamber 410 to complete the injection procedure. The structure can avoid the blockage caused by the filler entering the empty chamber 422 during injection, not only can reduce the difficulty of cleaning, but also is convenient, simple, safe and stable for general injectors by matching the structure with the injection operation.

Fig. 12A is a schematic diagram illustrating insertion of a needle tip structure 100f into a blood vessel 104 according to yet another embodiment of the present invention. Fig. 12B is a schematic diagram showing the needle structure 100f of fig. 12A during injection. As shown, the needle structure 100f includes a needle 200, a housing 300a, a catheter 900, a threaded portion 930, a rotating portion 940, and a syringe 950. The needle body 200 may be a blunt needle or a sharp needle, and in this embodiment, the needle body 200 includes a needle chamber 210, a needle opening 220, and a partition 400c, wherein the needle chamber 210 is connected to the needle opening 220, and the partition 400c is disposed on an inner edge of the needle chamber 210. Housing 300a is connected to needle 200 and housing 300a includes housing chamber 310, aperture 320 and housing wall 340. The bore 320 communicates with the housing chamber 310 and is disposed through the housing wall 340, and the needle chamber 210 communicates with the housing chamber 310. Furthermore, the catheter 900 has an injection port 910 and a tube wall 920, and the catheter 900 is movably disposed through the housing chamber 310 and the needle chamber 210 and filled with a filler. Partition 400c is spaced from needle port 220 by a first spacing D1, and injection port 910 is spaced from needle port 220 by a second spacing D2. The needle structure 100f of this embodiment does not have a switch portion, and the threaded portion 930 is connected between the catheter 900 and the rotating portion 940. The rotating part 940 has one end connected to the threaded part 930 and the other end connected to the syringe 950. When the injector rotates the rotating part 940, the catheter 900, the threaded part 930, the rotating part 940 and the syringe 950 rotate synchronously, so that the second distance D2 between the injection port 910 and the needle port 220 is adjusted. In addition, in the embodiment of fig. 12A, the first spacing D1 is less than the second spacing D2, and the partition 400c separates from the tube wall 920 to form the flashback port 440. Since the needle port 220 of the needle body 200 is inserted into the blood vessel 104, blood flows into the housing chamber 310 through the needle chamber 210, and the injector can observe the condition of the blood returning through the transparent or translucent housing 300a and know that the needle port 220 is located in the blood vessel 104. At this point, the injector will stop administering the filler and change the position of administration, i.e., change the position of the needle port 220, to ensure that the filler is not injected into the blood vessel 104 and causes an occlusion. In the embodiment of fig. 12B, the needle opening 220 of the needle body 200 is inserted into the nonvascular tissue 106, and the injector rotates the rotating portion 940 to decrease the second distance D2. The non-vascular tissue 106 is tissue without blood vessels 104. When the first distance D1 is greater than or equal to the second distance D2, the tube wall 920 is connected to the partition 400c, so that the blood return port 440 is closed, and the injector can inject the filler into the non-vascular tissue 106, thereby greatly increasing the safety of the operation, and thus it is a win-win situation for the injector and the patient.

Referring to fig. 13A and 13B together, fig. 13A is a cross-sectional view illustrating an outer needle 600 of a needle structure 100g according to another embodiment of the present invention. Fig. 13B is a side view showing the needle structure 100g of fig. 13A at the time of injection. As shown, the needle structure 100g is used for simultaneously injecting a filler and monitoring blood return, and includes an inner needle portion 500 and an outer needle portion 600.

The inner needle portion 500 includes a first needle 510 and a first housing 520. The first needle 510 includes a needle chamber 512 and a needle port 514, the needle chamber 512 is connected to the needle port 514. The first housing 520 is connected to the first needle 510, and the first housing 520 includes a housing chamber 522. The housing chamber 522 communicates with the needle chamber 512 to form a first chamber 530, the first chamber 530 being filled with a filling and communicating with the needle port 514. In addition, the outer needle 600 is disposed around the outer side of the inner needle 500, and the outer needle 600 includes a second needle body 610 and a second housing 620. Wherein the second needle body 610 is annularly arranged on the outer side of the first needle body 510, and the blood return port 612 is opened on the second needle body 610. The second shell 620 is connected to the second needle 610 and is disposed around the outside of the first shell 520. In addition, the second housing 620 may include a proximal portion 620a and a distal portion 620 b. Proximal portion 620a has two ends, one of which is attached to second needle 610 and the other of which is attached to distal portion 620 b. The front end of the distal portion 620b is engaged with the proximal portion 620a, and the distal portion 620b is provided with an opening 622. The inner needle portion 500 is displaceably positioned at the proximal end portion 620a and the distal end portion 620 b. Further, when the inner needle 500 is inserted into the outer needle 600, a second chamber 630 is formed between the outer needle 600 and the inner needle 500, and the second chamber 630 and the first chamber 530 are isolated from each other. The needle structure 100g of the present embodiment does not have a switch portion on the second housing 620, and the second housing 620 is made of rigid plastic, which may be transparent or translucent. Opening 622 communicates with second needle 610 through proximal end 620a to return blood port 612, which allows the injector to quickly identify whether blood is entering second chamber 630, and thus to know whether second needle 610 of outer needle 600 is inserted into the blood vessel. In addition, when the first needle body 510 is inserted into the second needle body 610, the injector may inject the filler in the inner needle part 500 to the needle port 514, as shown in fig. 13B. Therefore, the needle head structure 100g of the present invention confirms the blood return state through the special structure formed by the inner needle part 500 and the outer needle part 600, and can prevent the filler from being injected into the blood vessel to cause the blood vessel embolism when the injector injects the filler, thereby greatly improving the safety of the operation.

Fig. 13C is a side view showing a needle structure 100h according to yet another embodiment of the present invention. The needle structure 100h includes an inner needle 500 and an outer needle 600. Outer needle portion 600 includes a second needle 610, a second housing 620, a coupling seat 640, and an injection set 1000. The second housing 620 is provided with an opening 622. The inner needle 500, the second needle body 610 and the second housing 620 are the same as the inner needle 500, the second needle body 610 and the second housing 620 of the needle structure 100g in fig. 13A and 13B, and are not described again. Specifically, the outer needle 600 further comprises a connection seat 640 and an injection assembly 1000, wherein the connection seat 640 communicates with the opening 622 and is connected with the second housing 620. The connection base 640 and the second housing 620 are detachably connected or integrally connected, and the embodiment is integrally connected. The connecting base 640 is made of rigid plastic, and can be connected to various injection assemblies 1000 for exhausting air, discharging blood or generating negative pressure. In addition, injection assembly 1000 is connected to connecting seat 640, that is, injection assembly 1000 is communicated with second housing 620 through connecting seat 640. The injection assembly 1000 includes an injection housing 1010 and an injection rod 1020. The injection housing 1010 is detachably coupled to the coupling socket 640. The injection rod 1020 is disposed in the injection housing 1010 and is displaceably positioned in the injection housing 1010. When the injection rod 1020 is pushed by the injector, the injection assembly 1000 provides an impulse to clean the inside of the second needle 610 and the second housing 620. In other words, if a blood return condition occurs, the connecting seat 640 combined with the structure of the injection assembly 1000 can discharge the residual blood to allow the needle structure 100h to be used continuously, thereby reducing the cost of needle replacement.

As can be seen from the above embodiments, the present invention has the following advantages: firstly, the needle head structure of the invention can lead an injector to know whether the needle head is in the blood vessel without drawing back by utilizing the principle that the blood vessel naturally has pressure after the needle head enters the skin. Secondly, the needle structure of the invention is provided with a first chamber and a second chamber which are not communicated, the first chamber is filled with filler, and the second chamber is transparent and provided with an opening for confirming the blood return condition. When the opening is opened, the blood return condition can be confirmed, if the opening is closed, the filler can be prevented from entering the second cavity, so that an injector can prevent the filler from being injected into the blood vessel to cause blood vessel embolism when the filler is injected, and the safety of the operation is further improved. Thirdly, the special needle structure enables the injector to operate conveniently, and the injector can complete the treatment course smoothly. Fourthly, the special double-chamber structure and the partition piece can achieve the effects of injecting the filler and monitoring the blood return condition at the same time. Fifthly, the invention not only can lead the injector to smoothly and safely complete the injection treatment course, but also can reduce the risk of side effect or accident of the injected person. Sixthly, residual blood can be discharged by utilizing the structure that the connecting seat is combined with the injection assembly, so that the needle head structure can be continuously used, and the cost for replacing the needle head is further reduced.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A needle structure for simultaneously injecting a filler and monitoring blood return, said needle structure comprising:

an inner needle portion comprising:

the first needle body comprises a needle body cavity and a needle opening, and the needle body cavity is connected with the needle opening; and

the first shell is connected with the first needle body and comprises a shell cavity communicated with the needle body cavity to form a first cavity, and the first cavity is filled with the filler and communicated with the needle port; and

the outer needle part is annularly arranged on the outer side of the inner needle part and comprises an opening and a blood return port, a second chamber is formed between the outer needle part and the inner needle part, and the second chamber and the first chamber are isolated from each other;

wherein the outer needle portion further comprises:

the second needle body is arranged on the outer side of the first needle body in a surrounding mode, and the blood return port is formed in the second needle body; and

the second shell is connected with the second needle body and is arranged on the outer side of the first shell in a surrounding mode, and the opening is formed in the second shell; wherein the second housing is transparent or translucent and comprises:

a proximal portion having two ends, wherein one end is connected to the second needle body; and

a distal end portion connected to the other end of the two ends, the opening being provided on the distal end portion;

wherein the inner needle portion is displaceably positioned at the proximal end portion and the distal end portion; when the first needle body is not inserted into the second needle body, the opening is communicated with the second needle body through the proximal end part to form the blood return port, and the second shell is used for distinguishing whether blood enters the second cavity or not so as to deduce whether the second needle body of the outer needle part is inserted into a blood vessel or not; when the first needle body is inserted into the second needle body, the filler in the inner needle part is injected to the needle opening; wherein the filler is hyaluronic acid, calcium hydroxyapatite, polycaprolactone, collagen, poly-L-lactic acid, fat, polyacrylamide, acetone tetramortisol or lidocaine.

2. The needle structure of claim 1 wherein said second needle body is a blunt or sharp needle.

3. The needle structure of claim 1, wherein said outer needle portion further comprises:

the connecting seat is communicated with the opening and connected with the second shell; and

an injection assembly connecting the connection socket, the injection assembly comprising:

an injection housing detachably connected to the connection holder; and

the injection rod is arranged in the injection shell and can be movably positioned in the injection shell.