Pin assembly for operation capable of introducing drug

A pin assembly for operation includes a hollow pin for operation having a plurality of side holes defined through an outer surface thereof and a head which is closed or open due to the presence of a through-hole; a hollow support having a pin fastening part formed therein in the shape of a groove to fasten one end of the pin for operation, and being open at both ends thereof, and a hollow injector for insertion into an insertion hole formed in the support, wherein the hollow pin for operation is fastened to the pin fastening part of the support, and by applying external force to one end of the support, the hollow pin for operation is inserted into a bone.

TECHNICAL FIELD

The present invention relates to a pin assembly for operation and, more particularly, to a bendable pin assembly for operation in which a plurality of holes are defined through the wall and the head thereof, thus facilitating introduction of various medication and treatment agent therethrough.

BACKGROUND ART

These days, despite the development of diagnosis and treatment techniques for cancer patients, the number of patients who suffer pain due to spreading of cancer to the bone increases. In America alone, 1.2 millions of people are newly diagnosed with cancer every year, and 50% of these develop bone metastases according to statistics. Most cancers tend to spread to the bone, and approximately 20 to 80% of bone metastases have been reported according to the types of the cancers.

The cancer cells spreading to the bone cause bone melting and weakening, thus cause pathologic fracture or impending fracture, which is accompanied with severe pain and serious functional disabilities. Most bone metastases have multiple occurrences. Although advanced cancer patients are in need of surgical operation, it certainly is the great burden as well as high risk to both the patient and the medical professionals, as the surgical procedure involves incision of skin and muscles of the patient who already has unstable general condition or in need of on-going chemotherapy.

While the aged people take up large portion of the cancer patient population, the aged patients are more likely to develop osteoporotic bone fractures due to occurrence of osteoporosis generated in the process of cancer treatment. Such condition has high risk of developing into complications such as non-union of the fracture sites, weakness of general condition or loss of limb functions.

Therefore, efforts are necessary, to provide a surgical treatment of the involved bone that can be conducted in a simple and efficient manner, while preserving the general condition as much as possible, and without causing complications, particularly for the senile patients or advanced cancer patients.

The main treatment generally involves invasive surgery which includes incising skin and muscles to form bony window on the bone, curettage of tumor mass, reinforcing with bone cement, and using intramedullary nail or plate, tumor prosthesis or joint replacement arthroplasty.

A method for facilitating bone-union to treat the osteoporotic bone fracture generally involves fixing the fracture site with intramedullary nail or plate, defining a hole in the bone, inserting an injector, and introducing osteoinductive or osteoconductive bone substitutes therethrough. Materials for direct coating to promote bony incorporation on the stem of prosthesis and to prevent bone resorption have been used. In other words, the implant is required to play a role of drug-deliverer, as well as bone fixer.

Although percutaneous bone cement injection is used for the osteoporotic spinal compression fracture or metastatic bone cancer, it is difficult to prevent pathologic fracture particularly at the long bone of limb, in the absence of the internal fixation of metal implant. However, when the bone metastasis is accompanied with osteoporosis or progressed bone fracture, the internal metal fixator easily loosens out of the bone due to weakened bone, which is problematic. Accordingly, improved bone fixation method is necessary, which plays a role of not only the internal metal fixator, but also treatment agent injector.

Accordingly, an effective bone augmentation and stabilization surgical method is necessary, which can minimize surgical risks of the patients which may already have deteriorated general condition and also effectively reinforce weakening bones.

DISCLOSURE

Technical Problem

Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and an object of the present invention is to provide a pin assembly for operation which can solve the problems caused due to extensive surgery and allow medication or treatment agent to be easily injected to a treatment position, wherein, a pin for operation is inserted into the bone percutaneously and without requiring incision of skin or muscle, and various medications are injected through the pin in fixed position to reinforce the strength of the bone and to suppress the progress of the bone metastasis.

Technical Solution

In order to achieve the above objects, according to one aspect of the present invention, there is provided a pin assembly for operation, comprising a hollow pin for operation having a plurality of side holes defined through an outer surface thereof and a head which is closed or open due to the presence of a through-hole; a hollow support having a pin fastening part formed therein in the shape of a groove to fasten one end of the pin for operation, and being open at both ends thereof, and a hollow injector for insertion into an insertion hole formed in the support, wherein the hollow pin for operation is fastened to the pin fastening part of the support, and by applying external force to one end of the support, the hollow pin for operation is inserted into a bone curvature.

According to another aspect of the invention, the hollow pin for operation comprises the plurality of side holes defined through the outer surface thereof and a thread defined on the head.

According to another aspect of the invention, the hollow pin for operation comprises a hollow conduit connected with one end to the head, and a cover for screw-coupling with the head to define a predetermined space corresponding to a predetermined distance from an outer circumference of the conduit, and comprising a plurality of side holes defined therein, wherein an externally-injected material is stored in the predetermined space.

According to another aspect of the invention, the pin assembly for operation may additionally include a hollow driver comprising a through-hole formed therein, the hollow driver for insertion into an opening at one side of the hollow pin for operation.

According to another aspect of the invention, the head of the hollow pin for operation is sharp, blunt or bent to one side.

According to another aspect of the invention, the hollow pin for operation comprises side holes defined at an end of the head.

According to another aspect of the invention, the hollow pin for operation comprise a fastening part at an end of the body.

According to another aspect of the invention, the fastening part removably fastens the hollow pin for operation to the support by screw coupling.

According to another aspect of the invention, the pin assembly for operation may additionally include a stylet for insertion into the injector.

According to another aspect of the invention, the injector comprises a handle with which it is possible to adjust a leading end of the injector to be positioned at the side holes of the hollow pin for operation in need of medication injection.

According to another aspect of the invention, the pin assembly for operation may additionally include a T-shaped impactor for insertion in between the insertion hole on the inner side of the support and the injector, the T-shaped impactor comprising a through-hole defined along the center.

According to another aspect of the invention, a guide pin or a reinforcement metal wire is inserted into the through-hole of the head of the hollow pin for operation.

According to another aspect of the invention, the hollow pin for operation is formed from stainless steel, titanium or an alloy using the same.

According to still another aspect of the present invention, medication or bone cement is injected through the holes defined in the pin for operation into the bone.

According to still a further aspect of the present invention, the medication is selected from the group consisting of alcohol, liquid nitrogen, anticancer medicine, bone regenerating material, and anti-resorptive agent.

According to various embodiments, the pin assembly for operation does not require rather wide skin or muscle incision as is required by the conventional examples, but only defines a hole on the skin, while it provides medication to suppress tumor cells or bone resorption cell such as osteoclast, or bone cement through the conduit and holes of the pin for operation to thus reinforce weakened or fractured bone part and fix the pin for operation in position in the bone. That is, it is possible to percutaneously fix the weakened bone using pin for operation, while injecting various medications and treatment agents through the pin for operation inserted in the bone, without having to separately define a hole in the bone.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in greater detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts.

FIGS. 1athrough1jare schematic perspective views illustrating various configurations of a pin which is used in a pin assembly for operation according to the present invention.

Referring toFIGS. 1athrough1j, each of pins10for operation, which are used in the present invention, has a configuration of a hollow elongate bar which has a plurality of side holes30defined through the outer wall thereof. Each pin10for operation has a straight body15which has the side holes30defined through the wall thereof and a head20which is formed on the distal end of the body15and is brought into contact with the bone or another portion of the human body.

Depending on embodiments, the pins for operation may be classed into two types. For example,FIGS. 1ato1eillustrate nail-type pin, whileFIGS. 1fto1jillustrate screw-type pin.

Referring toFIGS. 1ato1e, the nail type pin for operation may have a sharp or blunt head20, and a fastener22formed at an end of the straight body15for screw-coupling with the support for pressing the pin. To be specific,FIG. 1aillustrates a pin10afor surgical operation, having a sharp head20and the fastener22at an end of the straight body15for surgical operation, and a closed end of the head20.FIG. 1billustrates a pin10bfor surgical operation similar to that illustrated inFIG. 1a, but different in terms of the presence of a through-hole40extended from an open end of the head20.FIG. 1cillustrates a pin10cfor surgical operation, in which the head20has a bent end for easy insertion into the long bone of limb, and a side hole30formed only on an end of the head20. The pin10cfor surgical operation is bendable to conform to the curves of the bone. The pin10cfor surgical operation may be bent within an appropriate range using tools such as press bender or the like as equipped in the operation room.

FIGS. 1dand1eillustrate pins10d,10efor surgical operation, provided in the form of intramedullar nail having a blunt head20. Referring toFIG. 1d, the pin10dfor surgical operation has a blunt head20with closed end, while referring toFIG. 1e, the pin10efor surgical operation has a blunt head20with an open end where the through-hole40is formed.

That is, the nail type pin for surgical operation may have sharp or blunt head20, with an end thereof being possibly bent partially for easy insertion into a long bone of limb. Further, an end of the head20may be open or closed, and the open head20may have a through-hole40formed therein. When the side hole30is formed only in an end of the head20, it is possible to partially adjust the site of intramedullar drug injection. Further, as explained above, the intramedullar nail may include the fastener22formed at an end of the straight body15to play a role of a support. The fastener22may preferably be 1/15 to 1/10 the entire length of the pin for surgical operation.

Meanwhile, referring toFIGS. 1fto1j, the screw type pin for surgical operation may include a sharp head20and a thread50formed on the head20. To be specific,FIG. 1fillustrates a pin10ffor surgical operation with a closed end, which has a sharp head20and a thread50formed on the sharp head20, whileFIG. 1gillustrates a pin10gfor surgical operation with an open end, which has a sharp head20, a thread50formed on the sharp head20, and a through-hole40formed in the end of the head20. It is preferable that the thread50formed on the screw type pin for surgical operation may be ⅕ to ⅓ the entire length of the pin for surgical operation.

Further,FIGS. 1hto1jillustrate a screw type pin10hfor surgical operation in different configuration.FIG. 1his a perspective view of the pin10hfor surgical operation,FIG. 1iis a perspective view illustrating a cover18separated from the pin10gfor surgical operation, andFIG. 1jis a sectional view ofFIG. 1h. To be specific, the pin10hfor surgical operation as illustrated inFIGS. 1ito1jmay include a hollow conduit35connected at one end to the head20, and a cover18screw-coupled with the head20to define a predetermined space55at a predetermined distance from an outer circumferential surface of the hollow conduit35, and having a plurality of side holes30formed therein, in which an externally-injected substance may be stored in the predetermined space55. Further, a guide pin (not illustrated) may be provided so that the screw type pin10his inserted along the guide pin (not illustrated). Further, after the screw type pin10his inserted, drug or treatment agent may be injected without removing the guide pin (not illustrated), to ensure intra-osseous intrusion only through the side holes, i.e., to ensure that the drug or treatment agent does not leak through the end of the head which serves as a passage for the guide pin.

Referring toFIG. 1i, the conduit35may have a smaller diameter than that of the thread50of the head20, so as to be inserted into an interior of the cover18. Due to the above-mentioned structure, externally-introduced substance such as, for example, drug or bone cement can move in the predetermined space55in the interior of the conduit35and the predetermined space55between the conduit35and the cover18. More material such as drug may be stored, as the predetermined space55is larger, and the material can be continuously supplied to a site in need of treatment through the side holes30. Accordingly, drug can be continuously supplied for an extended period of time so that the treatment effect is maximized.

As a surgeon inserts the pin10for operation shown in each ofFIGS. 1athrough1jinto the bone of a patient and injects medication or bone cement through an inlet port25which is defined at the proximal end of the pin10for operation, the medication or bone cement flows through an internal passage of the pin10for operation and is introduced into the bone through the side holes30and the through-hole40.

The injection amount of the medication or bone cement or a treatment position can be adjusted by changing the sizes and the positions of the side holes30and the through-hole40so that medial treatment can be given in accordance with an order of priority.

The pin10for operation can be made of stainless steel and, as a matter of course, may be made of an antirust alloy. For instance, titanium or a titanium-based alloy can be used.

A guide pin70or a reinforcing metal wire can be additionally provided in a manner such that it is inserted through the through-hole40of the pin10for operation to reinforce the strength of the pin10for operation. In the same manner as the pin10for operation, the guide pin70or the reinforcing metal wire can be made of stainless steel or an antirust alloy. It is preferred that titanium or a titanium-based alloy be used.

In the case that the guide pin70or the reinforcing metal wire is inserted through the internal passage35which is defined in the pin10for operation, the guide pin70or the reinforcing metal wire can be bent simultaneously with the pin10for operation. In this case, the guide pin70or the reinforcing metal wire can be bent using a press bender in an allowable range in conformity with a degree to which a bone as the target of operation is curved.

Bone cement can be introduced into the bone through the internal passage35which is defined in the pin10for operation. The bone cement reinforces the bone, prevents the inserted pin10for operation from being released out of the bone, increases the coupling strength between the bone and the pin10for operation, and generates heat while being set, so as to cause the death of cancer cells.

The medication capable of being injected through the pin10for operation includes 100% alcohol which can cause the death of cancer cells, liquid nitrogen which can quickly freezing cancer cells and cause the death of the cancer cells, anticancer medicine which can be introduced into the bone while being mixed with bone cement, to continuously cause the death of cancer cells, bone regenerating material which can promote bone union in a fractured portion of the bone, and anti-resorptive agent which can prevent osteoporosis and bone destruction from proceeding.

FIG. 2is a sectional view illustrating a nail type pin assembly100,100′,100″,100″′ for operation in accordance with one embodiment of the present invention.

In one embodiment, the pin assembly100for operation shown inFIG. 2ais composed of a hollow pin10bfor operation which has a plurality of side holes30defined through the wall thereof and in which a head20is sharply formed and is closed, a hollow support60in which a pin fastening part65is formed in the shape of a groove to fasten the proximal end of the pin10b for operation and both ends of the support60are open, a hollow injector85insertable into an insertion hole63defined through the support60and thereof stylet89for insertion into a guide part88of the injector85.

To be specific, the hollow injector85may be placed into the pin for operation, by being inserted in the insertion hole63within the support60, with a leading end86being placed at a location of the side holes30of the pin for operation to thus allow intra-osseous intrusion of a medication or treatment agent to an intended site. The medication may be injected using a needle (not illustrated) containing medication or bone cement into the guide part88of the hollow injector85, and the stylet89may be used to enable efficient intra-osseous intrusion of the medication or bone cement.

Although the size of the hollow injector85is not strictly limited as long as this can be placed at the side holes30, in one preferred embodiment, the hollow injector85may have a similar or longer length than that of the insertion hole62of the pin62for operation according to an embodiment of the present invention. Further, although the hollow injector85may have a width that enables insertion into the insertion hole63of the support60, such is not specifically limited as long as the hollow injector85allows movement into the insertion hole63and adjustment of injection site of the medication or bone cement.

Depending on embodiment, the pin assembly100′ for operation may include a T-shaped impactor80for insertion between the insertion hole63and the hollow injector85inside the support of the pin assembly100for operation, as is illustrated inFIG. 2b.

The pin assembly100′ for operation shown inFIG. 2bis composed of a hollow pin10bfor operation which has a plurality of side holes30defined through the wall thereof and in which a head20is sharply formed and a through-hole40is defined through the head20, a hollow support60in which a pin fastening part65is formed in the shape of a groove to fasten the proximal end of the pin10cfor operation and both ends of the support60are open, a T-shaped impactor80which is inserted into an insertion hole63defined through the support60and an injector85for insertion into a through-hole83of the impactor80.

The impactor80may insert the pin10bfor operation into a bone when external force is exerted to a collision part81of the impactor80. The support60may be formed to insert the pin for operation into a bone, and the support60or the impactor may preferably be formed from a material that does not easily deform or break by the external force.

With the impactor80as the one illustrated inFIG. 2bis provided, the support60inserts the pin10bfor operation into a bone by the external force exerted to one end thereof, and when the pin10bfor operation is planted within a bone for treatment, the impactor80is removed and medication or bone cement is injected through the hollow support60or the injector85which is open on both ends. The medication or bone cement moves to a site for treatment, and suppresses bone metastasis and bone fracture, and also reinforce the bone as it hardens within the bone.

On the contrary, when no impactor80is provided as in the case ofFIG. 2a, the support60inserts the pin10bfor operation into a bone as external force is exerted onto one end of the support60. Then after the pin10afor operation is planted within the bone for treatment, medication or bone cement is injected through the hollow support60with both open ends. Since the medication or bone cement moves to a site for treatment within the bone via the side holes30, it is possible to adjust the location of the site for treatment using the injector85.

The pin assembly100′ for operation may also include a guide pin70or a reinforcing metal wire which is installed by being inserted through the through-hole83of the impactor80and the through-hole40defined through the head20of the pin10bfor operation. After the surgeon drives the guide pin70through the skin into the bone, by applying external force to the support60or the impactor80, the pin10bfor operation is driven into the bone along the path of the guide pin70, as shown inFIG. 2c.

The flexible guide pin70functions to guide the pin10bfor operation so that the pin10bfor operation can be easily fixed intramedullary, i.e., easily driven into the bone. In this regard, as the occasion demands, by not removing the guide pin70but leaving an appropriate length of the guide pin70, the guide pin70can serve to reinforce the strength of the pin10bfor operation in the same way as the reinforcing metal wire.

Hence, after inserting the guide pin70into the pin10bfor operation, the guide pin70and the pin10bfor operation are simultaneously bent using a press bender, etc., and then, by applying external force to them, they can be driven into the bone.

Meanwhile, a nail type pin for operation may be bent before being driven into the bone, to suit the configuration of the long bone of limb such as femur, humerus, or tibia. The nail type pin for operation may have a plurality of side holes defined on only an end thereof, as is illustrated inFIG. 2d.

To be specific, a pin assembly100″ for operation includes a sharp bent head20, a hollow pin10cfor operation which has a plurality of side holes30defined through an end of the head20, a hollow support60having a pin fixer65formed in groove configuration on an inner side to fix an end of one side of the pin10cfor operation and having both open sides, and a T-shaped impactor80for insertion into an insertion hole63formed on an inner side of the support60and having a through-hole83defined in the center thereof.

With the pin10cfor operation driven into the bone for treatment, medication or bone cement is injected through the support60. The medication or bone cement, when injected, moves past an inlet port, the side holes30and the through-hole40formed on an end of the head20and to the site for treatment inside the bone and causes cancer cell death or hardens in the bone.

The pin for operation for use in the pin assembly100,100′,100″,100″′ may be replaced depending on use. For example, when the thread50is formed on the head20of the pin for operation, the pin for operation may be rotated along the path of the thread to be driven into the bone, and this can be used particularly when the bone is relatively weak or to fix relatively short bone, as is illustrated inFIG. 3.

FIG. 3provides sectional view and perspective view of a pin assembly200for operation using screw type pin for operation.

Referring toFIG. 3, a 1 g pin10gfor operation is used in the pin assembly200for operation, according to an embodiment of the present invention. To be specific, the screw type pin assembly200for operation illustrated inFIG. 3may include a sharp hollow pin10gfor operation having a plurality of side holes30formed on an outer surface, an open head20at an end, a through-hole40, and a thread50formed on the head20, a pin support65formed in groove configuration to fix an end of one side of the pin10gfor operation, a hollow support60with both open sides, a hollow injector85for insertion into an insertion hole63defined inside the support60, and a stylet89for insertion into a guide88of the injector85.

FIG. 4illustrates a pin assembly for operation having a screw type pin for operation according to another embodiment, in which a driver is connected to the pin for operation instead of the support.FIG. 5illustrates the driver ofFIG. 4according to yet another embodiment.

Referring toFIG. 4a, the pin assembly300for operation may include a hollow pin10gfor operation having a plurality of side holes30defined on an outer surface and a thread50formed on a head20, a hollow driver90for insertion into an opening formed on one side of the pin10gfor operation to transmit external force, and having a through-hole94, an injector for insertion into the through-hole94of the driver90, and a stylet89for insertion into a guide88of the injector85.

A through-hole40is defined through the head20of the pin10gfor operation, and an inlet port25of the pin10gfor operation may have a hexagonal tubular form.

Further,FIG. 4bis a perspective view of a screw type pin assembly300′ for operation, which may include a hollow pin10hfor operation having a plurality of side holes30defined on an outer surface, and a through-hole40formed on a sharp head20at an end, a hollow driver90for insertion into an opening at one side of the pin10hfor operation to transmit external force, and having a through-hole94, an injector85for insertion into the through-hole94of the driver90, and a stylet89for insertion into a guide88of the injector85.

The medication or bone cement, when fed from outside, is introduced through the guide88of the injector85, past the interior of the driver90and arrives at the pin10gfor operation. The depth of insertion of the injector85is so adjusted to meet the side hole where medication injection is necessary, and medication is injected through a needle. If intramedullar intrusion is not efficiently made, the medication or bone cement can be easily pushed into the bone using the stylet89which is inserted into the guide88.

A guide pin (not illustrated) or a reinforcement wire (not illustrated) may be arranged by being inserted through the through-hole40of the head20and the guide88of the driver90of the pin10g,10hfor operation. In this case, a surgeon drives the guide pin into the bone via the skin, and exerts an external force on the support60or the driver90so that the pin10g,10hfor operation is driven into the bone along the path of the guide pin (not illustrated). That is, the guide pin (not illustrated) guides the pin10g,10hfor operation to be easily driven into the bone, and may not be removed but retained in an adequate size, in which case the guide pin (not illustrated) may reinforce the strength of the pin for operation as the reinforcement metal wire does.

Referring to the enlargement ofFIG. 4aand toFIG. 5, he driver90has a cylindrical body92which has different diameters at both ends thereof. A through-hole94is defined through the center portion of the driver90. An insertion part93having a hexagonal sectional shape is formed at the distal end of the body92.

In the state in which the insertion part93of the driver90is fitted into the inlet port25of the pin10gfor operation and the head20of the pin10gfor operation is brought into direct contact with a portion of the bone to be treated, by applying external force to the driver90, the pin10gfor operation can be driven into the bone. At this time, since force is transmitted through the driver90which is an integral element, the force can be concentrated rather than dispersed. Therefore, eventhough the thread50is formed on the head20of the pin10gfor operation, the pin10gfor operation can be easily driven into the bone.

The injector85is inserted into the through-hole94of the driver90, and it is possible to adjust the depth of inserting the injector85for positioning at the through-hole of the pin for operation to allow introduction of the treatment agent to an intended site. The treatment agent may be pushed efficiently into the bone using the stylet89, when there is resistance in the process of injecting the treatment agent.

The driver90is mainly used for a pin for operation which is formed with the thread50. Thus, the pin10hfor operation shown inFIG. 1hcan also be used together with the driver50.

FIG. 6is a radiograph obtained by penetrating X-rays through a bone having pins10driven therein. Referring toFIG. 6, a nail type pin ‘b’ for operation is completely inserted into the bone, a screw type pin ‘a’ for operation is inserted into the bone, and bone cement ‘c’ is injected into the bone.

FIG. 7is a radiograph obtained by penetrating X-rays through a bone having nail type pins10driven into long bone of limb.

FIG. 7Ais the bone scan image, showing multiple bone metastasis in bones including both femur and left tibia, before surgical operation, andFIG. 7Bshows the nail type pin for operation being inserted into the long bone, and bone cement being injected (a, b, c) into the intramedullary bony lesion of metastatic bone cancer.

As explained above, an intramedullar nail type pin for operation is bendable itself before being driven into the bone, to suit the configuration of the long bones such as femur, humerus, or tibia. Further, the plurality of side holes may be formed on only an end of the nail type pin for operation, in which case the bone cement or medication can be limitedly focused to a lesion when the pin for operation is intramedullary inserted.

That is, the length of insertion of the long bone is measured in advance, and the pin for operation is driven intramedullary to arrange the side hole to the bone lesion. After that, medication or bone cement is injected into the bone through the hole defined in the pin for operation, and when sufficient amount of medication or bone cement is injected, the pin for operation is driven to the end so as to be completely placed within the medullar cavity before the bone cement hardens.

FIG. 8shows a screw type pin for operation10fto10hbeing inserted into femur neck in the process of surgical operation, according to an embodiment of the present invention.

Referring toFIG. 8, a screw type pin for operation is so configured that it is possible to adjust the position where the medication is injected, by inserting the injector into the tube of the pin for operation and arranging the same to meet the intended side hole. As explained above, minute adjustment is also possible, because medication or bone cement is injected into the bone, by inserting a separate injector into the driver and deep into the screw type pin for operation, and arranging the injector to the intended side hole of the pin for operation.

FIGS. 8(a) to8(e) are intraoperative fluoroscopic radiographs, andFIG. 8(g) is postoperative X-ray radiograph. To be specific,FIG. 8(a) shows two guide pines70being inserted into the femur neck with metastatic bone cancer, and the screw type pin20for operation being inserted using the driver90. After that,FIG. 8(b) shows a leading end of the injector85being positioned close to the lesion along the guide pins70driven into the central through-hole.FIGS. 8(c) and8(d) show the guide pines70being removed, and medication or bone cement being injected through the guide88of the injector85, and the medication or bone cement being charged into the bone starting from the side hole at the leading end of the injector85as the medication or bone cement within the injector85is pushed by the stylet89.

After the injection is completed, and before medication or bone cement hardens,FIG. 8(e) shows the guide pins70being cut to meet the length of the pin20for operation, and pushed inward through the injector85for the purpose of bone reinforcement, and pushed by the stylet to be seated at the central through-hole of the pin20for operation.FIG. 8(f) shows the injector85and the stylet89being removed.

The pin for operation and the pin assembly for operation according to the present invention can be used only by defining a hole in the skin without the need of extensive incision of the skin or the muscle. Further, by injecting various medication or treatment agent in various ways through the internal passage and the side holes defined in the pin for operation, the pin for operation and the pin assembly for operation according to the present invention can be effectively used for bone metastasis, senile fracture, osteoporotic fracture, fracture nonunion, etc. As a consequence, since operation can be conveniently conducted within a short time without bleeding, advantages are conferred in that the general condition of a patient can be preserved and, when subsequent treatment is necessary, it can be immediately taken without loss of time.