CN107335114B - Needle head structure - Google Patents

Abstract

The present invention discloses a needle structure, which comprises a needle body, a shell and a partition. The needle body chamber of the needle body is connected to the needle port. The shell is connected to the needle body and comprises a shell chamber and an opening, and the needle body chamber is connected to the shell chamber to form a needle cavity. The partition separates the needle cavity into a first chamber and a second chamber, and the first chamber and the second chamber are isolated from each other. The partition separates the needle port into an injection port and a blood return port, the first chamber is filled with a filler and connected to the injection port, and the second chamber is connected to the blood return port and the opening. Since the blood vessels of the human body, whether arteries or veins, have natural pressure, there will be blood return when injected into the blood vessels. By using the transparency of the second chamber and the opening to confirm the blood return status, the injector can avoid hitting the blood vessels and causing vascular embolism during injection, thereby improving the safety of the operation.

Description

Needle structure

technical field

The present invention relates to a needle structure, in particular to a needle structure that can instantly confirm the blood return condition and improve the safety of the operation.

Background technique

When injecting fillers (such as hyaluronic acid) with a sharp needle of a general needle, in order to avoid bacterial infection, the air in the cavity of the needle will not be injected into the tissue. Before injection, the user will first perform the action of venting, and push the filler into the cavity in the needle first, until the cavity inside the needle is filled with hyaluronic acid, and the injection will be performed after confirming that there is no air in the needle.

Generally, the filler used for medical and aesthetic injections is not a liquid, but a material close to a solid, so when injecting, it is necessary to avoid the position of blood vessels. Because once injected into the blood vessel, it will cause the blockage of the blood vessel, which can easily cause serious side effects such as skin necrosis, blindness, stroke, and pulmonary embolism.

The location of filler injection is usually under the skin. However, during the actual injection, there is no way to visually check whether there are blood vessels in the subcutaneous tissue, so it is considered a blind injection because there is no way to do it during injection. 100% sure where to inject. Therefore, in practice, the injector must be familiar with the anatomical structure, select an appropriate injection plane and position, or use a blunt cannula, or perform aspirate during injection to confirm whether there is blood back. to ensure no injection into blood vessels.

The currently known technology is to perform a withdrawing action during injection to confirm whether there is blood returning. However, generally injected fillers will have different viscosity coefficients depending on their material, and more viscous fillers, such as Radiesse, Ellanse or macromolecular hyaluronic acid, will The air will fill the cavity inside the needle. If the needle tip is in the blood vessel when injecting these fillers, even if we perform the retraction action, it will be too viscous due to the influence of the viscosity of the filler, so that the blood cannot flow back into the syringe, so the phenomenon of returning blood cannot be observed. . If you continue to push the syringe at this time to inject the filler into the blood vessel, it will cause embolism of the blood vessel. Therefore, even if the method of retraction is used, if a filler with a large viscosity coefficient is used, there is still a risk of misjudgment.

Another well-known technique is to use a blunt needle, which is not pointed but has a rounded shape. Theoretically, blood vessels will not be injured, but a blunt needle that is too thin still has a certain degree of puncturing force of a sharp needle, so there is still a risk of puncturing a blood vessel when using a blunt needle. It can be seen from the above that whether it is a sharp needle or a blunt needle, there is a certain danger during injection, mainly because after the needle tip enters the skin, the injector has no way to know whether the needle tip is in the blood vessel. Therefore, there is currently a lack of needle structures on the market that can quickly confirm blood return and greatly reduce the risk of surgical failure. Therefore, relevant manufacturers are seeking solutions.

SUMMARY OF THE INVENTION

Therefore, the present invention provides a needle structure, which enables the injector to know whether the needle tip is in the blood vessel by using the phenomenon of blood returning generated by the natural pressure in the blood vessel without withdrawing after the needle tip enters the skin. In addition, the needle structure of the present invention has a disconnected first chamber and a second chamber, the first chamber is filled with a filler, and the second chamber is transparent and has an opening to confirm the condition of blood return. When the opening is opened, the blood return status can be confirmed. If it is closed, the injection filler can be prevented from flowing back into the second chamber, so that the injector can avoid the filler from entering the blood vessel and cause blood vessel embolism during injection, thereby improving the safety of the operation. . In addition, the special needle structure enables the injector to operate conveniently, allowing the injector to more smoothly complete the administration course.

One embodiment of the present invention is a needle structure for injecting filler and monitoring blood return. The needle structure includes an inner needle portion and an outer needle portion. The inner needle portion includes a first needle body and a first casing. The first needle body includes a needle body chamber and a needle port, and the needle body chamber is connected to the needle port. The first housing is connected to the first needle body, and the first housing includes a housing cavity. The housing chamber communicates with the needle body chamber to form a first chamber. The first chamber is filled with filler and communicates with the needle port. In addition, the outer needle portion is annularly arranged on the outer side of the inner needle portion, and the outer needle portion includes an opening and a blood return port. A second chamber is formed between the outer needle portion and the inner needle portion, 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. The second needle body ring is arranged on the outer side of the first needle body. The blood return port is opened on the second needle body. In addition, the second housing is connected to the second needle body and is annularly arranged on the outer side of the first housing. The opening is opened on the second casing. The second shell is transparent or translucent, and includes a proximal portion and a distal portion. The proximal part has two ends, one of which is connected to the second needle body, and the other end is connected to the distal part. The opening is arranged on the distal end. 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 connected to the blood return port through the proximal end of the second needle body. Whether the second needle body of the inner needle body is inserted into the blood vessel; when the first needle body is inserted into the second needle body, the filler in the inner needle part will be injected into the needle port. In addition, the filler can be Hyaluronic Acid (Hyaluronic Acid), Calcium Hydroxyapatite (Radiesse), Polycaprolactone (Ellanse), Collagen (Collagen), Poly-L-Lactic Acid (Poly-L-Lactic Acid) , PLLA, Sculptra), fat (Fat), polyacrylamide (Polyacrylamide, Aaquamid), Triamcinolone Acetonide (Triamcinolone Acetonide) or lidocaine (Lidocaine).

Thereby, the needle structure of the present invention forms a special annular chamber through the inner and outer needle parts, which can be used to confirm the condition of blood return, and can prevent the injector from injecting the filler into the blood vessel and cause blood vessel embolism. Improve the safety of surgery.

Other examples of the aforementioned embodiments are as follows: the aforementioned second needle body is a blunt needle or a sharp needle. In addition, the aforementioned outer needle portion may include a connecting seat and an injection assembly. The connecting seat communicates with the opening and is connected to the second casing. The injection assembly is connected to the connection base, and the injection assembly includes an injection housing and an injection rod. The injection housing is detachably connected to the connection seat. The injection rod is provided in the injection housing and is displaceably positioned in the injection housing.

Description of drawings

FIG. 1 is a three-dimensional schematic diagram illustrating a needle structure according to an embodiment of the present invention.

FIG. 2 is a side view illustrating the needle structure of FIG. 1 .

FIG. 3 is a cross-sectional view illustrating the line 3 - 3 of FIG. 2 .

FIG. 4A is a schematic diagram illustrating the closing of the switch portion of FIG. 1 .

FIG. 4B is a schematic diagram illustrating the opening of the switch portion of FIG. 1 .

FIG. 5 is a schematic diagram illustrating the operation of the needle structure of FIG. 1 .

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

FIG. 7 is a cross-sectional view showing the line 7 - 7 of FIG. 6 .

FIG. 8 is a three-dimensional schematic diagram illustrating a needle structure according to another embodiment of the present invention.

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

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

FIG. 10B is a side view illustrating the needle structure of FIG. 10A during injection.

FIG. 11A is a side view illustrating a needle structure according to another embodiment of the present invention when blood return is confirmed.

FIG. 11B is a side view illustrating the needle structure of FIG. 11A during injection.

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

FIG. 12B is a schematic diagram illustrating the needle structure of FIG. 12A during injection.

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

FIG. 13B is a side view illustrating the needle structure of FIG. 13A during injection.

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

Detailed ways

Various embodiments of the present invention will be described below with reference to the accompanying drawings. For the sake of clarity, many practical details are set forth in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. Furthermore, for the purpose of simplifying the drawings, some well-known and conventional structures and elements are shown in simplified schematic form in the drawings; and repeating elements may be denoted by the same reference numerals.

Please refer to Figures 1 to 4B together. FIG. 1 is a schematic perspective view illustrating a needle structure 100 according to an embodiment of the present invention. FIG. 2 is a side view illustrating the needle structure 100 of FIG. 1 . FIG. 3 is a cross-sectional view illustrating the line 3 - 3 of FIG. 2 . FIG. 4A is a schematic diagram illustrating the closing of the switch portion 330 of FIG. 1 . FIG. 4B is a schematic diagram illustrating the opening of the switch portion 330 of FIG. 1 . As shown in the figure, the needle structure 100 is used for injecting filler, and the filler can be Hyaluronic Acid, Radiesse, Ellanse, Collagen, Poly-L-lactic acid (Poly) -L-Lactic Acid; PLLA; Sculptra), fat (Fat), polyacrylamide (Polyacrylamide; Aquamid) or other drugs that are not suitable for intravascular injection, such as: Triamcinolone Acetonide or lidocaine (Lidocaine). The main component of the above-mentioned Radiesse is Calcium Hydroxyapatite, and the main component of Ellanse is Polycaprolactone. As can be seen from the above, the needle structure 100 of the present invention can be applied to various medical needs. The needle structure 100 includes a needle body 200 , a housing 300 and a spacer 400 .

The needle body 200 includes a needle body chamber 210 and a needle port 220 , and the needle body chamber 210 is connected to the needle port 220 . Needle body 200 may be a blunt needle or a sharp needle. The front end of the blunt needle is arc-shaped, and its needle port 220 is located on the side of the front end. The pointed needle is the general oblique needle. Moreover, the needle body 200 is a slender metal tube, and is in the shape of a hollow cylinder, so as to facilitate piercing or pulling out of the skin.

The housing 300 is connected to the needle body 200 . The housing 300 includes a housing chamber 310 , an opening 320 , a switch portion 330 and a housing wall 340 , and the needle body chamber 210 communicates with the housing chamber 310 to form the needle cavity 102 . Furthermore, the openings 320 are opened on the side of the casing wall 340 . The switch portion 330 corresponds to the opening 320 and is mounted on the housing wall 340 , and the switch portion 330 can open or close the opening 320 . In detail, the switch portion 330 is a switchable movable valve, which can communicate or isolate the housing chamber 310 inside the housing 300 from the outside air. The switch portion 330 can be manually controlled to switch. In addition, the casing 300 is made of hard plastic, which can be transparent or translucent, and the casing wall 340 of this embodiment is transparent, which allows the injector to quickly identify whether blood enters the casing cavity in room 310.

The divider 400 is disposed in the needle cavity 102 , and the divider 400 separates the needle cavity 102 into the first chamber 410 and the second chamber 420 . The first chamber 410 and the second chamber 420 are isolated from each other. In addition, the separator 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 , while the second chamber 420 is connected with the blood return port 440 and the opening 320 . In other words, the present invention is a structure in which the needle cavity 102 in the needle structure 100 is divided into two chambers by the partition member 400 , and the two chambers are the first chamber 410 and the second chamber 420 respectively. The first chamber 410 and the second chamber 420 may be the same size, or may be one large and one small. The shapes of the first chamber 410 and the second chamber 420 may be circular, oval, rectangular or polygonal.

FIG. 5 is a schematic diagram illustrating the operation of the needle structure 100 of FIG. 1 . The first chamber 410 of the needle structure 100 is filled with filler, 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 the puncturing step. In this puncturing step, the injector (physician or medical personnel) punctures the needle body 200 into the skin of the person being administered. The second step is the injection step, which involves injecting the filler into non-vascular tissue.

In the puncturing step, the injector can use the second chamber 420 to confirm the blood return status, and the principle is mainly to use the capillary phenomenon and the pressure of the arterial and venous 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. Since the shell wall 340 adjacent to the opening 320 is made of transparent material, the injector can directly observe whether there is blood returning phenomenon occurs. The above method is just like when blood is drawn, in order to confirm whether the needle tip has entered the blood vessel, the blood drawer will observe the condition of blood returning on the hard plastic shell 300 of the needle, because the blood in the blood vessel has a certain pressure. , the air in the needle tip will be pushed out, so that the blood will run into the housing 300 to which the needle head is connected. The second chamber 420 of the present invention has such a function. There is air inside the second chamber 420, but it is not connected to the injected substance of the first chamber 410. Therefore, the first chamber 410 is connected to the second chamber 410. The chambers 420 are all independent spaces. During injection, the second chamber 420 maintains atmospheric pressure, but once the needle tip pierces the blood vessel, the injector can immediately observe the return of blood at the transparent rigid plastic housing 300 of the needle because of capillary phenomenon and the pressure of the arterial and venous. Phenomenon. Compared with the known needle, the needle structure 100 of the present invention can achieve the effect of confirming whether the needle is in the blood vessel without the action of withdrawing, and the injector only needs to see no blood returning during the puncturing step. , you can be sure that the needle tip is not in the blood vessel. Therefore, under the condition of no retraction, the injector can use the needle structure 100 of the present invention to inject safely, which not only increases the safety of the operation, but also avoids many unnecessary medical disputes. It is also worth mentioning that, before the puncture, the injector must first open the switch part 330 of the housing 300, because the switch part 330 can keep the air in the second chamber 420 at atmospheric pressure, so once the needle tip is in the blood vessel, the injection The patient can immediately see the return of blood and stop the injection. After the injector has determined the position to be injected and determined not to move, the valve of the switch part 330 can be closed, and then the injection step is entered.

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 puncture step, the injector can push the syringe to let the filler in the first chamber 410 after the needle tip is not in the blood vessel. successfully into the organization. In addition, in the injection step, closing the valve by the switch part 330 can keep the air in the second chamber 420 and maintain a fixed gas pressure in the second chamber 420, so that the filling of the first chamber 410 will not be affected by pressure. The relationship flows back into the second chamber 420, so that the space in the second chamber 420 remains unblocked without being blocked. In addition, the filler often needs to be injected at multiple points, and the injector can use the needle structure 100 again after pulling out the needle structure 100 for the treatment of the next position. The chamber 420 can resume the function of detecting blood return again. In this way, the needle structure 100 of the present invention enables the injector to know whether the needle tip is in the blood vessel without withdrawing after the needle tip enters the skin, so the injector can avoid the filler from entering the blood vessel during injection. Vascular embolization, thereby improving the safety of surgery.

Please refer to FIG. 6 and FIG. 7 together. FIG. 6 is a side view illustrating a needle structure 100 a according to another embodiment of the present invention. FIG. 7 is a cross-sectional view showing the line 7 - 7 of FIG. 6 . As shown in the figure, the needle structure 100 a is used for injecting filler, and the needle structure 100 a includes an inner needle portion 500 and an outer needle portion 600 .

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

The outer needle portion 600 is annularly disposed outside the inner needle portion 500 , and the outer needle portion 600 includes a second needle body 610 and a second housing 620 . The second needle body 610 is annularly disposed 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 housing 620 is connected to the second needle body 610 and is annularly disposed outside the first housing 520 . The opening 622 and the switch portion 624 are both opened on the second casing 620 . Furthermore, a second chamber 630 is formed between the outer needle portion 600 and the inner needle portion 500 , the second chamber 630 and the first chamber 530 are isolated from each other, and the second chamber 630 is connected to the blood return port 612 and the opening 622 . The structure of the switch portion 624 is the same as that of the switch portion 330 in FIGS. 4A and 4B , and will not be repeated here. In addition, the second casing 620 is made of hard plastic, which can be transparent or translucent, and the second casing 620 in this embodiment is transparent, which allows the injector to quickly distinguish whether there is blood or not into the second chamber 630 . Thereby, the needle structure 100a of the present invention forms a special annular chamber through the inner needle part 500 and the outer needle part 600, which can be used to confirm the condition of blood return, and can prevent the injector from injecting filler into the blood vessel during injection And cause vascular embolism, greatly improving the safety of surgery.

FIG. 8 is a schematic perspective view illustrating a needle structure 100b according to another embodiment of the present invention. The needle structure 100b includes a first needle body 710 , a first casing 720 , a second needle body 730 and a second casing 740 . The first needle body 710 includes a first needle body chamber 712 and a first needle port 714, the first needle body chamber 712 is connected to the first needle port 714, and the cross section of the first needle body 710 can be circular, oval, or rectangular. or polygon. The first housing 720 is connected to the first needle body 710 , and the first housing 720 includes a first housing chamber 722 , and the first needle body chamber 712 communicates with the first housing chamber 722 to form the first chamber 702 . Furthermore, the second needle body 730 is fixedly connected to the first needle body 710, and the two are attached to each other, and the cross section of the second needle body 730 can also be circular, oval, rectangular or polygonal. The second needle body 730 includes a second needle body chamber 732 and a second needle port 734 . The second needle body chamber 732 is connected to the second needle port 734 , and the second needle port 734 is adjacent to the first needle port 714 . In addition, the second housing 740 is connected to the second needle body 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 is filled with filler, and the second chamber 704 is connected to the second needle port 734 and the opening 744 . The switch portion 746 is mounted on the housing wall 748 , and the switch portion 746 can open or close the opening 744 . Furthermore, the casing wall 748 of the second casing 740 is partially transparent, which allows the injector to quickly identify whether blood has entered the second chamber 704 . The switch portion 746 in this embodiment is a cover, which is pivotally connected 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 portion 746 can also be controlled manually. It is also worth mentioning that one end of the second needle body 730 may be curved, that is, the part of the second needle body 730 close to the second housing 740 is curved. The curved structure causes the extension direction of the first shell 720 to intersect with the extension direction of the second shell 740 at an included angle. This included angle can be greater than 10 degrees and less than 90 degrees. In this embodiment, the included angle is 45 degrees. The purpose is to allow enough space for the second housing 740 to be installed, and if the included angle is too small, the first housing 720 and the second housing 740 will be too close. It is easy to cause inconvenience when the part 746 is used. Therefore, the needle structure 100b of the present invention can not only confirm the condition of blood return without withdrawing, avoid the embolism of the blood vessel caused by the filling of the filler, and improve the safety of the operation; Complete the treatment course.

FIG. 9 is a side view illustrating a needle structure 100c according to still another embodiment of the present invention. The needle structure 100c includes a needle body 800 , a housing 300 and a spacer 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 will not be described again. In particular, the needle structure 100c of the embodiment shown in FIG. 9 is a blunt needle, and the front end of the needle body 800 is arc-shaped. The spacer 400 is disposed in the needle cavity 102 , and the spacer 400 separates the needle cavity 102 into the first chamber 410 and the second chamber 420 . The first chamber 410 and the second chamber 420 are isolated from each other. Moreover, the separator 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 , while the second chamber 420 is connected with the blood return port 440 and the opening 320 . Since the needle port 220 is located on the side of the front end, the injection port 430 and the blood return port 440 are both opened on 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 separator 400 close to the needle port 220 and the injection port 430 , so that the injection of the filler and the monitoring of the blood return can be performed at the same time. In addition, if the front end of the spacer 400 is flush with the injection port 430, the injection port 430 may be inside the blood vessel and the blood return port 440 is outside the blood vessel when the injector operates the needle structure 100c. This embodiment can avoid this. situation occurs. Therefore, the needle structure 100c has the first chamber 410 and the second chamber 420 which are not communicated. The first chamber 410 is filled with filler, the second chamber 420 is transparent, and the casing 300 is provided with the opening 320 and The switch part 330 is used to confirm the status of blood return. When the opening 320 is opened, the blood return state can be confirmed, and if it is closed, the injection of filler can be prevented from entering the second chamber 420 . The overall structure allows the injector to avoid the filler from being penetrated into the blood vessel during injection, thereby improving the safety of the operation.

FIG. 10A is a side view illustrating a needle structure 100d according to another embodiment of the present invention when blood return is confirmed. FIG. 10B is a side view illustrating the needle structure 100d of FIG. 10A during injection. As shown, the needle structure 100d includes a needle body 200 , a housing 300 , a spacer 400a and a catheter 900 . The needle body 200 is a sharp needle. In the embodiment shown in FIGS. 10A and 10B , the needle body 200 and the housing 300 are respectively the same as the needle body 200 and the housing 300 in FIG. 2 , and will not be repeated here. In particular, the spacer 400a of the needle structure 100d of the embodiment shown in FIGS. 10A and 10B is disposed in the needle cavity 102 and has a first spacer 402a, a second spacer 404 and a blood return port 440. The spacer 400a separates the needle The cavity 102 separates the first chamber 410 and the second chamber 420 . The blood return port 440 communicates with 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 located between the first partition portion 402a and the second partition portion 404, and the blood return port 440 has a diameter D3. One end of the first partition portion 402 a is connected to the inner wall of the needle body 200 , and the other end is connected to the inner edge of the housing wall 340 . The second partition 404 is located in the needle chamber 210 and is L-shaped in side view. Specifically, the second chamber 420 is connected to the blood return port 440 and the opening 320 of the housing 300 , so that the second chamber 420 is between the blood return port 440 and the opening 320 . The blood return port 440 is separated from the needle port 220 by a first distance D1. Furthermore, the catheter 900 has an injection port 910 and a pipe wall 920, and the catheter 900 is displaceably penetrated into the first chamber 410 and filled with filler. The tube wall 920 has 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 this step, the injector inserts the catheter 900 into the first chamber 410 and moves the injection port 910 to a specific position, so that the gap between the injection port 910 and the needle port 220 is The second distance D2 is greater than the first distance D1. At this time, the second chamber 420 is communicated with the needle port 220, so that the injector can confirm whether the blood vessel has been injected through the condition of returning blood, as shown in FIG. 10A . The second step is to inject the filler. In this step, the injector will first push the catheter 900 toward the needle port 220 and further advance a certain interval, so that the second distance D2 between the injection port 910 and the needle port 220 is less than It is equal to the first distance D1. At this time, the wall 920 of the catheter 900 closes the blood return port 440, so that the first chamber 410 and the second chamber 420 are isolated 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. Such a structure can prevent the filler from entering the second chamber 420 to form blockage during injection, and can reduce the difficulty of cleaning. It is also worth mentioning that after the injection is completed, the catheter 900 can be withdrawn from the first chamber 410 and discarded for replacement, while the needle body 200 can be recycled after cleaning and sterilization, and continues with another catheter 900 filled with filler In the next injection, this structure and operation can not only reduce the manufacturing cost, but also the operation is convenient, simple and safe. Because the filler is viscous, the traditional needle structure of injection is likely to cause the filler to be blocked and cannot be used. The present invention not only allows the injector to complete the injection course smoothly and safely, but also greatly reduces the occurrence of the injection. Side effects or unexpected risks.

FIG. 11A is a side view illustrating a needle structure 100e according to another embodiment of the present invention when blood return is confirmed. FIG. 11B is a side view illustrating the needle structure 100e of FIG. 11A during injection. As shown, the needle structure 100e includes a needle body 200 , a housing 300 , a spacer 400b and a catheter 900 . In the embodiments of FIGS. 11A and 11B , the needle body 200 , the housing 300 and the catheter 900 are the same as the needle body 200 , the housing 300 and the catheter 900 in FIGS. 10A and 10B , respectively, and will not be described again. In particular, the divider 400b of the needle structure 100e of the embodiment shown in FIGS. 11A and 11B has a first divider 402b, a second divider 404 and a blood return port 440, and the divider 400b separates the needle cavity 102 from the first cavity Chamber 410 and second chamber 420 . In addition, the first partition portion 402b is shorter than the first partition portion 402a of FIG. 10A , so the diameter D3 of the blood return port 440 of the needle structure 100e of FIGS. 11A and 11B is larger than the diameter of the blood return port 440 of the needle structure 100d of FIGS. 10A and 10B . D3. In other words, the first partition portion 402b is only provided in the housing 300, and the second partition portion 404 close to the needle port 220 is provided in the needle body 200. The needle body chamber 210 of the needle body 200 has no first partition portion. 402b. Under such structural conditions, the needle body 200 can be made into a thinner tube body, that is, the needle body 200 with a smaller diameter can be made into the needle body 200 , thereby reducing the size of the wound caused by the puncture of the needle body 200 . In addition, when the injector operates the needle structure 100e, two steps are also performed. The first step is to confirm the blood return. In this step, the injector inserts the catheter 900 into the needle body chamber 210 and moves the injection port 910 to a specific position, so that the first gap between the injection port 910 and the needle port 220 is The second distance D2 is greater than the first distance D1. At this time, an empty chamber 422 is formed between the outer wall of the catheter 900 and the inner wall of the needle body 200. The empty chamber 422 is a part of the second chamber 420, and the empty chamber 422 and the needle port 220 communicate with each other, allowing the injector to return blood through the The condition confirms whether the blood vessel is hit, as shown in Figure 11A. The second step is to inject the filler. In this step, the injector will first push the catheter 900 toward the needle port 220 and further advance a certain interval, so that the second distance D2 between the injection port 910 and the needle port 220 is less than It is equal to the first distance D1. At this time, 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 filler in the catheter 900 into the needle port 220 . Finally, when the filler is injected, the catheter 900 is pulled out of the needle body 200 and the first chamber 410 to complete the injection procedure. This structure can prevent the filler from entering the empty chamber 422 and cause blockage during injection, which not only reduces the difficulty of cleaning, but also is convenient, simple, safe and stable for ordinary injectors to cooperate with the injection operation.

FIG. 12A is a schematic diagram illustrating the insertion of the needle structure 100f into the blood vessel 104 according to still another embodiment of the present invention. FIG. 12B is a schematic diagram illustrating the needle structure 100f of FIG. 12A during injection. As shown in the figure, the needle structure 100f includes a needle body 200 , a housing 300 a , a conduit 900 , a threaded portion 930 , a rotating portion 940 and a syringe 950 . The needle body 200 can be a blunt needle or a sharp needle, and the present embodiment is a sharp needle, and the needle body 200 includes a needle body chamber 210, a needle port 220 and a separator 400c, the needle body chamber 210 is connected to the needle port 220, and the separator 400c is provided with on the inner edge of the needle chamber 210 . The housing 300 a is connected to the needle body 200 , and the housing 300 a includes a housing cavity 310 , an opening 320 and a housing wall 340 . The opening 320 communicates with the housing chamber 310 and penetrates through the housing wall 340 , and the needle body 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 displaceably penetrated through the housing chamber 310 and the needle chamber 210 and filled with filler. The spacer 400c is separated from the needle port 220 by a first distance D1, and the injection port 910 is separated from the needle port 220 by a second distance D2. The needle structure 100f of this embodiment is not provided with a switch portion, and the threaded portion 930 is connected between the catheter 900 and the rotating portion 940 . One end of the rotating part 940 is connected to the screw part 930 , and the other end is 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 all 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 distance D1 is smaller than the second distance D2 , and the separator 400 c is separated from the tube wall 920 to form the blood return port 440 . Since the needle port 220 of the needle body 200 is inserted into the blood vessel 104 , the blood will flow into the housing chamber 310 through the needle body chamber 210 , and the injector can observe the blood returning through the transparent or translucent housing 300 a and know Needle port 220 is already located within vessel 104 . At this time, the injector will stop injecting the filler, and change the position of injection, that is, the position of the needle port 220, to ensure that the filler will not be injected into the blood vessel 104 and cause blockage. In the embodiment of FIG. 12B , the needle port 220 of the needle body 200 is inserted into the non-vascular tissue 106 , and the injector rotates the rotating part 940 to reduce the second distance D2 . 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, thereby closing the blood return port 440, and the injector can apply filler to the non-vascular tissue 106, which greatly increases the operation time. Safety, so for injectors and patients, it can be said to be a win-win for doctors and patients.

Please refer to FIGS. 13A and 13B together. FIG. 13A is a cross-sectional view illustrating the outer needle portion 600 of the needle structure 100g according to another embodiment of the present invention. FIG. 13B is a side view illustrating the needle structure 100g of FIG. 13A during injection. As shown in the figure, the needle structure 100g is used for simultaneously injecting filler and monitoring blood return, and includes an inner needle part 500 and an outer needle part 600 .

The inner needle portion 500 includes a first needle body 510 and a first housing 520 . The first needle body 510 includes a needle body chamber 512 and a needle port 514 , and the needle body chamber 512 is connected to the needle port 514 . The first housing 520 is connected to the first needle body 510 , and the first housing 520 includes a housing cavity 522 . The housing chamber 522 communicates with the needle body chamber 512 to form a first chamber 530 . The first chamber 530 is filled with filler and communicates with the needle port 514 . In addition, the outer needle portion 600 is annularly disposed on 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 . The second needle body 610 is annularly disposed 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 housing 620 is connected to the second needle body 610 and is annularly disposed outside the first housing 520 . In addition, the second housing 620 may include a proximal portion 620a and a distal portion 620b. The proximal portion 620a has two ends, one of which is connected to the second needle body 610 and the other end is connected to the distal portion 620b. The front end of the distal end portion 620b is fitted close to the end portion 620a, and the distal end 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 620b. Furthermore, when the inner needle part 500 is inserted into the outer needle part 600, a second chamber 630 is formed between the outer needle part 600 and the inner needle part 500, and the second chamber 630 and the first chamber 530 are isolated from each other. The needle structure 100g of the present embodiment is not provided with a switch portion on the second casing 620, and the second casing 620 is made of hard plastic, which can be transparent or translucent. The opening 622 communicates with the second needle body 610 through the proximal end 620a to the blood return port 612, which allows the injector to quickly identify whether blood enters the second chamber 630, and then infer the second needle body of the outer needle portion 600. Whether 610 is inserted into the blood vessel. In addition, when the first needle body 510 is inserted into the second needle body 610, the injector can inject the filler in the inner needle part 500 to the needle port 514, as shown in FIG. 13B . Thereby, the needle structure 100g of the present invention confirms the state of blood return through the special structure formed by the inner needle part 500 and the outer needle part 600, and can prevent the injector from injecting the filler into the blood vessel and causing blood vessel embolism, Significantly improve the safety of surgery.

FIG. 13C is a side view illustrating a needle structure 100h according to yet another embodiment of the present invention. The needle structure 100h includes an inner needle portion 500 and an outer needle portion 600 . The outer needle portion 600 includes a second needle body 610 , a second housing 620 , a connecting seat 640 and an injection assembly 1000 . The second casing 620 is provided with an opening 622 . The inner needle portion 500 , the second needle body 610 and the second casing 620 have the same structures as the inner needle portion 500 , the second needle body 610 and the second casing 620 of the needle head structure 100g in FIGS. 13A and 13B , and are no longer Repeat. In particular, the outer needle portion 600 further includes a connecting seat 640 and the injection assembly 1000 . The connecting seat 640 communicates with the opening 622 and is connected to the second housing 620 . The connection between the connection seat 640 and the second housing 620 is detachable connection or integral connection, and in this embodiment, the connection is integrally connected. The connecting base 640 is made of hard plastic, and can be connected to various injection assemblies 1000 for exhausting, discharging blood or creating negative pressure. In addition, the injection assembly 1000 is connected to the connection seat 640 , that is, the injection assembly 1000 communicates with the second housing 620 through the connection seat 640 . The injection assembly 1000 includes an injection housing 1010 and an injection rod 1020 . The injection housing 1010 is detachably connected to the connection seat 640 . The injection rod 1020 is provided 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 body 610 and the second housing 620 . In other words, if there is blood returning, the connection seat 640 combined with the structure of the injection assembly 1000 can drain the residual blood and allow the needle structure 100h to continue to be used, thereby reducing the cost of needle replacement.

It can be seen from the above-mentioned embodiments that the present invention has the following advantages: First, the needle structure of the present invention enables the injector to know whether the needle tip is not after the needle tip enters the skin, using the principle of natural pressure in the blood vessel, without withdrawing. in blood vessels. Second, the needle structure of the present invention has a disconnected first chamber and a second chamber, the first chamber is filled with filler, and the second chamber is transparent and has an opening to confirm the condition of blood return. When the opening is opened, the blood return can be confirmed, and if it is closed, the filler can be prevented from entering the second chamber, so that the injector can avoid the filler from being injected into the blood vessel and cause blood vessel embolism, thereby improving the safety of the operation. Third, the special needle structure enables the injector to operate conveniently, allowing the injector to more smoothly complete the course of treatment. Fourth, the special dual-chamber structure and the setting of the separator can achieve the effect of simultaneously injecting filler and monitoring blood return. Fifth, the present invention not only allows the injector to complete the administration course smoothly and safely, but also reduces the risk of side effects or accidents occurring to the administered person. Sixth, the use of the connecting seat combined with the structure of the injection assembly can drain the residual blood and allow the needle structure to continue to be used, thereby reducing the cost of replacing the needle.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The protection scope of the invention shall be determined by the claims.

Claims (3)

1. A needle structure for simultaneously injecting filler and monitoring blood return, wherein the needle structure comprises: Inner needle section, containing: a first needle body, comprising a needle body chamber and a needle port, the needle body chamber being connected to the needle port; and A first housing is connected to the first needle body, the first housing includes a housing chamber, the housing chamber communicates with the needle body chamber to form a first chamber, and the first chamber contains the filler and communicate with the needle port; and The outer needle part is arranged on the outer side of the inner needle part, the outer needle part includes an opening and a blood return port, and a second chamber is formed between the outer needle part and the inner needle part, and the first The second chamber and the first chamber are isolated from each other; The outer needle portion further comprises: The second needle body is arranged on the outer side of the first needle body, and the blood return port is opened on the second needle body; and a second shell, connected to the second needle body and arranged around the outside of the first shell, the opening is opened on the second shell; wherein the second shell is transparent or semi-transparent Transparent and contains: a proximal portion having two ends, one of which is connected to the second needle body; and a distal end, connected to the other end of the two ends, and the opening is arranged on the distal end; Wherein the inner needle portion is movably 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 passes through the proximal end portion and the distal end portion. The second needle body is connected to the blood return port, and the second shell is used to distinguish whether blood enters the second chamber, so as to infer whether the second needle body of the outer needle part is inserted into the blood vessel; When the body is inserted into the second needle body, the filler in the inner needle will be injected into the needle port; wherein the filler is hyaluronic acid, calcium hydroxyapatite, polycaprolactone, collagen, poly-L-lactic acid, fat, poly Allylamine, acetone, cortisol, or lidocaine. 2. The needle structure according to claim 1, wherein the second needle body is a blunt needle or a sharp needle. 3. The needle structure of claim 1, wherein the outer needle portion further comprises: a connecting seat, communicated with the opening and connected with the second casing; and The injection assembly is connected to the connecting seat, and the injection assembly includes: an injection housing detachably connected to the connection seat; and An injection rod is provided in the injection housing and is displaceably positioned in the injection housing.

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